Relevant bibliographies by topics / OWPT

Academic literature on the topic 'OWPT'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "OWPT"

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Asaba, Kaoru, and Tomoyuki Miyamoto. "Relaxation of Beam Irradiation Accuracy of Cooperative Optical Wireless Power Transmission in Terms of Fly Eye Module with Beam Confinement Mechanism." Photonics 9, no. 12 (December 16, 2022): 995. http://dx.doi.org/10.3390/photonics9120995.

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In optical wireless power transmission (OWPT) systems, since beam size is finite, and relative position and attitude between transmitter and receiver is not always stationary, both beam alignment and shaping accuracies are important parameters. Analysis based on a power generation efficiency calculation model of general OWPT systems shows that their tolerances are quite demanding, especially for long range OWPT, and relaxation is inescapably necessary. This study introduces the fly eye lens as a candidate to relax these difficulties and, moreover, it features producing homogeneous irradiation onto the solar cell array. All of these are essential to OWPT systems. In this study, cooperative OWPT is discussed, in which solar cell array and power transmitter mutually align each other. Its efficiency calculation model is integrated with a fly eye module surrounded by reflective walls. System level requirements are analyzed regarding beam shaping and alignment in terms of power generation ratio, and it is clarified that this module largely relaxes requirements. In this module, beam power is confined within the module and will be eventually absorbed by the solar cell as the incident beam is within the acceptance angle. This feature avoids degradation of power generation ratio due to beam shape mismatch. These advantages bring progress towards building operational OWPT.
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Zhao, Mingzhi, and Tomoyuki Miyamoto. "1 W High Performance LED-Array Based Optical Wireless Power Transmission System for IoT Terminals." Photonics 9, no. 8 (August 16, 2022): 576. http://dx.doi.org/10.3390/photonics9080576.

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Optical wireless power transmission (OWPT) is a promising technology for remote energy supply, especially for powering Internet of things (IoT) terminals. Light-emitting diode (LED)-based power sources of OWPT are attractive for the development of high-performance systems without the constraints of safety issues. In this paper, the electricity output of a near-infrared LED-OWPT is significantly improved. The saturation output caused by the small lens aperture in the LED array collimation scheme was analyzed. The experiment achieved a maximum electricity output of more than 1 W from a 50 × 50 mm2 GaAs solar cell at 1 m transmission distance. In addition, the thermal features also proved the feasibility of a high-output LED-OWPT system for practical applications.
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Zhao, Mingzhi, and Tomoyuki Miyamoto. "Optimization for Compact and High Output LED-Based Optical Wireless Power Transmission System." Photonics 9, no. 1 (December 28, 2021): 14. http://dx.doi.org/10.3390/photonics9010014.

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Optical wireless power transmission (OWPT) is a technology that supplies energy remotely. Due to the great advantages of long transmission distances, high directionality, no electromagnetic interference noise, and loose safety regulations, light emitting diode (LED) based OWPT systems become appropriate candidates for powering various applications, especially for the Internet of things (IoT). In this paper, improved LED-OWPT systems are proposed based on a collimation scheme for optimizing the system dimension and output. In a single LED configuration, the system dimension is compressed by 46% while the high transmission efficiency is maintained. As for the LED-array system, the dimension is compressed by 56%, and the output is enhanced by 40%. In the experiment, a high electricity output of 532 mW is achieved at 1 m transmission distance. In addition, the effect of misalignment between LED and lens and the potential of long-distance transmission are clarified in the LED-array OWPT system.
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Asaba, Kaoru, Kenta Moriyama, and Tomoyuki Miyamoto. "Preliminary Characterization of Robust Detection Method of Solar Cell Array for Optical Wireless Power Transmission with Differential Absorption Image Sensing." Photonics 9, no. 11 (November 15, 2022): 861. http://dx.doi.org/10.3390/photonics9110861.

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In an optical wireless power transmission (OWPT) system, position and size of the photovoltaic device (PV) should be accurately determined from the light source position. Even though the detection of PV for OWPT has been studied and reported in some literature, the methods reported thus far are not so robust against varying background illumination. This study aims to solve such problems utilizing an image sensor which generates a differential absorption image from two wavelength images. Unnecessary background illumination presented in the two images is subtracted in the differential image. The differential image of the Si substrate target, which simulates PV, was detected by this sensor from a 104.5 cm distance. Signal illumination intensity was less than 1 μW/cm2 on the target, and detection accuracy was 3.1% for the diameter of the substrate and about 6.3% for the area. The system level requirement is derived, and they were verified by these results. The detection range of this sensor is shown to be expandable at the cost of, for example, increasing the receiver diameter of the image sensor or controlling the transmitter beam’s divergence. With the simple experiment apparatus, preliminary results of performance assessment were obtained and issues for performance improvement and potential of this image sensor were recognized.
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Matsuura, Motoharu. "Recent Advancement in Power-over-Fiber Technologies." Photonics 8, no. 8 (August 15, 2021): 335. http://dx.doi.org/10.3390/photonics8080335.

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Power-over-fiber is a power transmission technology using optical fibers that offers various features not available in conventional power lines, such as copper wires. The basic configuration of power-over-fiber comprises three key components: light sources, optical fibers, and photovoltaic power converters. This review article presents the features of power-over-fiber and its key components. Moreover, recent advancement in power-over-fiber technologies based on their latest results is introduced, focusing primarily on papers presented at the Optical Wireless and Fiber Transmission Conferences (OWPT) from 2019 to 2021.
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Tang, Jing, Kazuhito Matsunaga, and Tomoyuki Miyamoto. "Numerical analysis of power generation characteristics in beam irradiation control of indoor OWPT system." Optical Review 27, no. 2 (March 10, 2020): 170–76. http://dx.doi.org/10.1007/s10043-020-00590-z.

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Wong, Yiu Leung, Shunsuke Shibui, Masahiro Koga, Shunki Hayashi, and Shiro Uchida. "Optical Wireless Power Transmission Using a GaInP Power Converter Cell under High-Power 635 nm Laser Irradiation of 53.5 W/cm2." Energies 15, no. 10 (May 18, 2022): 3690. http://dx.doi.org/10.3390/en15103690.

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Optical wireless power transmission (OWPT) system is a technology that supplies energy from remote locations, having some features such as long-distance transmission, high directivity, and no electromagnetic noise interference. This study investigated the optical transmission efficiency and photoelectric conversion efficiency with a transmission distance of 10 m using GaInP power converter cells with a small area of 2.40 × 2.40 mm2 and a 635 nm high-power laser over 50 W/cm2. As a result, we achieved a photoelectric conversion efficiency of 44.7% under 6.7 W/cm2 (0.14 W) and 37.2% under 53.5 W/cm2 (1.1 W) irradiation. These results suggested that W-class optical wireless power transmission could be realized by expanding the converter cell area. Additionally, it was found that the reductions of the divergence angle of the laser and the heat generation of the power converter cell were critical issues for further lengthening the distance and increasing the power.
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Tai, Yuha, and Tomoyuki Miyamoto. "Experimental Characterization of High Tolerance to Beam Irradiation Conditions of Light Beam Power Receiving Module for Optical Wireless Power Transmission Equipped with a Fly-Eye Lens System." Energies 15, no. 19 (October 8, 2022): 7388. http://dx.doi.org/10.3390/en15197388.

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This paper is an experimental characterization of a light-receiving module containing a fly-eye lens system with high tolerance to beam irradiation conditions. The fly-eye lens system, which is tolerant to fluctuations in beam shape, beam size, number of beams, beam incident position, and beam incident direction, was proposed, a light receiver module with a fly-eye lens system was constructed, and its characteristics were evaluated. The effect of the beam size on the fly-eye lens system was evaluated and the tolerance to misalignment of beam incident position was measured. When a GaAs solar cell was irradiated with a laser beam of 450 nm wavelength and 6 W light output through a 90 cm long water tank with tap water, a maximum output of 0.755 W was obtained as underwater OWPT. In addition, a fly-eye lens system with mirrors applied to four surfaces was proposed and fabricated as a light-receiving side module that can receive high incident angles from any direction of up, down, left, and right and its effectiveness was clarified through experiments.
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Li, Zheng, Anbo Ming, Wei Zhang, Tao Liu, Fulei Chu, and Yin Li. "Fault Feature Extraction and Enhancement of Rolling Element Bearings Based on Maximum Correlated Kurtosis Deconvolution and Improved Empirical Wavelet Transform." Applied Sciences 9, no. 9 (May 7, 2019): 1876. http://dx.doi.org/10.3390/app9091876.

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In order to extract and enhance the weak fault feature of rolling element bearings in strong noise conditions, the Empirical Wavelet Transform (EWT) is improved and a novel fault feature extraction and enhancement method is proposed by combining the Maximum Correlated Kurtosis Deconvolution (MCKD) and improved EWT method. At first, the MCKD method is conducted to de-noise the signal by eliminating the non-impact components. Then, the Fourier spectrum is segmented by local maxima or minima in the envelope of the amplitude spectrum with a pre-set threshold based on the noise level. By building up the wavelet filter banks based on the spectrum segmentation result, the signal is adaptively decomposed into several sub-signals. Finally, by choosing the most meaningful sub-signal with the maximum kurtosis, the fault feature can be extracted in the squared envelope spectrum and teager energy operator spectrum of the chosen component. Both simulations and experiments are performed to validate the effectiveness of the proposed method. It is shown that the spectrum segmentation result of improved EWT is more reasonable than the traditional EWT in strong noise conditions. Furthermore, compared with commonly used methods, such as the Fast Kurtogram (FK) and the Optimal Wavelet Packet Transform (OWPT) method, the proposed method is more effective in the fault feature extraction and enhancement of rolling element bearings.
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Mohrmann, Martin, Céline Heuzé, and Sebastiaan Swart. "Southern Ocean polynyas in CMIP6 models." Cryosphere 15, no. 9 (September 7, 2021): 4281–313. http://dx.doi.org/10.5194/tc-15-4281-2021.

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Abstract. Polynyas facilitate air–sea fluxes, impacting climate-relevant properties such as sea ice formation and deep water production. Despite their importance, polynyas have been poorly represented in past generations of climate models. Here we present a method to track the presence, frequency and spatial distribution of polynyas in the Southern Ocean in 27 models participating in the Climate Model Intercomparison Project Phase 6 (CMIP6) and two satellite-based sea ice products. Only half of the 27 models form open-water polynyas (OWPs), and most underestimate their area. As in satellite observations, three models show episodes of high OWP activity separated by decades of no OWP, while other models unrealistically create OWPs nearly every year. In contrast, the coastal polynya area is overestimated in most models, with the least accurate representations occurring in the models with the coarsest horizontal resolution. We show that the presence or absence of OWPs is linked to changes in the regional hydrography, specifically the linkages between polynya activity with deep water convection and/or the shoaling of the upper water column thermocline. Models with an accurate Antarctic Circumpolar Current transport and wind stress curl have too frequent OWPs. Biases in polynya representation continue to exist in climate models, which has an impact on the regional ocean circulation and ventilation that should be addressed. However, emerging iceberg discharge schemes, more adequate vertical grid type or overflow parameterisation are anticipated to improve polynya representations and associated climate prediction in the future.
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Dissertations / Theses on the topic "OWPT"

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Chen, Ying. "Bucket Foundation in Clay for OWT Subjected to Combined Cyclic Loads." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-27160.

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This thesis project investigates the bucket foundation in clay subjected to cyclic loads. The cyclic irregular loading history in this thesis was represented by the equivalent number of cycles Neq with a certain level of cyclic to average stress ratio tcy/ta which can be derived using cyclic shear strain accumulation procedure developed in NGI. The first part is the bearing capacity analysis of bucket foundation in clay. The second part is to produce the displacement contour diagrams.The bearing capacity analysis used in-house software BIFURC from NGI. The normalized failure envelopes were investigated for different degree of cyclic degradation expressed by Neq, soil profiles and bucket foundation geometry h/D. The two soil profiles used in this thesis project were constant cyclic shear strength with depth for OCR=40 and linearly increase cyclic shear strength with depth for OCR=1 & 40. Drammen clay was used as basis for the evaluation.The mobilized ultimate capacity were plotted for pure horizontal load, pure vertical load and pure overturning moment. The loads were applied in the decoupling point, meaning that the pure horizontal load fail under pure sliding. It was found that the three load component were equally influenced by cyclic degradation and that the increase and reduction in the total failure as function of Neq and Fcy/Fa could be defined by one curve for a given OCR.The cyclic effect during combined loading was studied through normalized failure envelopes. The normalized failure envelopes do not change for changing cyclic loading history for the same soil profile. The normalized failure envelopes changed in HM load plane due to different h/D and different soil profiles. The failure envelopes describes a full surface in the 3D load space HVM. Besides, the failure envelopes could be described by formulas suggested by Gourvenec and Barnett with some modifications for the failure envelopes in HM plane.Displacement contour diagrams were produced for a wide range of load combination in HVM load space. MATLAB was used to interpolate the results from bearing capacity analysis to produce the displacement contour diagrams. The displacement contours gives the stiffness for bucket foundation under cyclic loading. Finally, a procedure was made to account cyclic loading to determine the bearing capacity and stiffness for bucket foundation for OWT. The cyclic loads as input parameters are represented by Neq and Fcy/Fa. The other input parameters are bucket foundation geometry h/D and soil profile.
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Abis, Letizia. "Study of the effect of organic waste products amendments (OWPs) and microbial diversity on volatile organic compounds (VOCs) emissions by soil." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS443.

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Les émissions de COVs jouent un rôle central sur la pollution atmosphérique. Les sources biogéniques des COVs sont entre 10 et 11 fois plus élevées que les émissions des COVs provenant par des sources anthropiques. Récemment, l'importance de la caractérisation des flux de COVs par les sols et les microorganismes a été soulignée. En effet, les émissions des COVs provenant du sol et des microorganismes sont des possibles précurseurs des particules atmosphériques et de la formation d'O3. En particulier, ce travail est centré sur la caractérisation des émissions de COVs par des sols amendés avec des PROs en détectant les émissions toute de suite après l’apport, 1 an et 2 ans après l’apport des PROs. De plus, l'influence de la diversité microbienne du sol sur les émissions de COV a également été analysée. Les émissions de COVs ont été détectées à l'aide de la technique PTR-QiTOF-MS et la totalité des expériences a été réalisées dans des conditions de laboratoire contrôlées en utilisant des chambres dynamiques pour la détection des COVs émis par les échantillons. Les résultats ont montré que les différentes PROs émettent des quantités COVs variables et que les propriétés chimiques et physiques du sol influençaient également les émissions. L’analyse de l'influence de la biodiversité microbienne sur les émissions de COVs a montré que si la diversité microbienne est plus élevée, les émissions de COVs par les sols sont plus faibles. En outre, la diversité des COVs diminue lorsque les émissions de COVs par le sol sont plus élevées. Enfin, l'étude de la dynamique des émissions de COVs par de microcosmes récemment amendés avec du PRO, a montré que le flux des émissions de COV augmentait dans les premières 49 heures après l'apport des PRO en raison d'une perturbation de la communauté microbienne dans le sol
VOCs emissions play a pivotal role on the atmospheric pollution. Biogenic sources of VOCs are between 10 and 11 times higher than VOC emissions from anthropogenic sources. Recently, the importance of the characterization of the VOC fluxes by soils and microorganisms has been highlighted. Instead, VOCs emissions from soil and microorganisms are possible precursors of the particulate matter and the O3 formation. This work is focused on the characterization of the VOCs emissions by soils amended with OWPs over the long and short terms application. The influence of the microbial diversity in soil on VOCs emissions was also analysed. VOC emissions were detected using the PTR-QiTOF-MS technique and all the experiments were performed under controlled laboratory condition using dynamic chambers for the detection of the VOCs emissions from samples. The results showed that different OWPs released different quantity of VOCs emissions and also the chemical and physical properties of the soil were linked to the emissions. Analyses on the influence of microbial biodiversity on VOCs emissions have shown that while the microbial diversity was higher VOC emissions by soils were lower. Furthermore, the diversity of the VOCs decreases when the VOCs emissions by soil are higher. Finally, the study of the dynamics of VOC emissions from microcosms amended with fresh OWPs, showed that the VOC emission flux increased in the first 49 hours after the OWP amendment, due to a disturbance of the microbial community in the soil
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Wang, Xinrui. "Indoor environments robot localization by employing 802.11 wireless network one way propagation time measurements." Thesis, 2010. http://hdl.handle.net/2440/64115.

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Indoor service robots have been under research and development for decades, but still can not be widely applied. Lack of autonomy is one of the critical factors which limit the application of indoor service robots. Unlike industry production line robots, indoor service robots require highly accurate localization ability for navigation and automation. Commonly used GPS localization algorithms can not be applied in indoor environments, because the indoor satellite signals are too weak for localization. Different technologies have been employed to provide robots with indoor localization abilities. Infrared sensors, Radio Frequency ID (RFID), ultrasonic sensors, laser range finders and visual cameras all have been successfully developed to provide indoor localization solutions. Except the concerns like measurements’ accuracy, size, cost to deploy, most of these localization solutions can only locate robots relevant to indoor objects, for instance walls, doors and cabinets. The localization information lacks a reference to the whole building or at least the floor where robots are working. This thesis aims to develop an indoor localization system which can provide cheap, easy to access, reliable, accurate localization information with the reference to the whole floorplan. With the development of Wireless Local Area Network (WLAN), many researchers have developed the indoor localization systems based on WLAN. Angle of Arrival (AOA), Received Signal Strength (RSS) and Time of Arrival (TOA) are three commonly used WLAN indoor localization technologies. With the consideration of accuracy and difficulty to apply among different WLAN localization methods, One Way Propagation Time (OWPT), which is a sub-category of TOA, was developed to an accurate and low cost indoor localization system. In all the reviewed literatures, no research was found which aimed to develop an OWPT localization system for WLAN. The OWPT measurement algorithms in this thesis provide a potential for achieving sub-meter indoor localization accuracy, which is more precise than most other localization methods. Based on OWPT localization algorithms, a WLAN OWPT indoor localization system is presented at the end of the thesis which can continuously provide robots with accurate and robust localization information in indoor environments. The developed OWPT algorithms contain two parts: one is Synchronization between Access Points (AP) and Mobile Station (MS); another is OWPT Measurement Precision Improvement. According to 802.11 protocols, every AP in a WLAN transmits beacon frames periodically. A beacon frame contains its transfer time from an AP and that AP’s identification: Basic Service Set ID (BSSID). A MS can record the beacon frame’s arrival time. The beacon frame’s OWPT is calculated from these two recorded times. There are two challenges in the application of OWPT measurements in a WLAN. Firstly, the AP clock and the MS clock need to be highly synchronized before calculating OWPT. Secondly, an ordinary 802.11 WLAN APs’ time precision is 1 microsecond (μs) which corresponds to 30 meters (m) localization precision. The proposed OWPT algorithms utilize μs precision transfer times and nanosecond (ns) precision arrival times to synchronize the MS and AP clocks and measure a beacon frame’s OWPT with ns precision. A One-AP-One-MS simulation model was built to simulate transmission of beacon frames from an AP to a MS. The viability of the proposed OWPT algorithms was verified in the simulation model. Simulation results indicated that the proposed algorithms could refine WLAN OWPT measurements to meet the ns precision required. When the proposed algorithms were further verified in experiments, hardware limitations were exposed. Due to the lack of highly accurate onboard timers, the ordinary wireless adapter wireless adapters could not record beacon frame arrival times with ns precision. To test the proposed algorithms experimentally, an software timer and oscilloscope were employed to record beacon frames arrival time with ns precision respectively. Test results are detailed and analysed in the thesis. The presented OWPT measurement algorithms will not only benefit indoor service robots, but also provide a low cost indoor localization solution for other indoor services which based on locations, for example warehouse arrangement, customer information access, entertainment etc. Further research is needed to improve hardware timers’ precision on either wireless adapters or computers to record beacon frame arrival time with ns precision. The combination of a ns precision hardware clock and the proposed OWPT measurement algorithms will allow effective implementation of high precision OWPT measurement in WLAN for indoor localization.
Thesis (M.Eng.Sc.) -- University of Adelaide, School of Mechanical Engineering, 2010
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Hall, Ellen. "'You can’t make owt from nowt': official responses to the impact of unemployment upon the community in the Lancashire weaving area in the early 1930s." Thesis, 2009. http://hdl.handle.net/2440/63394.

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This thesis argues that the official responses at the national level to the impact high unemployment had upon the community in the North East Lancashire weaving area in the early1930s were barely adequate. The Lancashire cotton industry had been in depression since the early 1920s, long before the Great Depression affected the rest of the world, and the high unemployment and the low wages paid in the cotton industry had a disastrous effect on an area almost totally dependent upon that industry. Financial conservatism during the Great Depression meant low benefits, and these low benefits resulted in widespread poverty. I argue that in contrast to the national government’s response, local authorities in North East Lancashire set a reasonably high standard of care in their area. They cared for those in need: children, the elderly and the sick and made medical care and education available for children with disabilities. They provided maternal and child welfare clinics, a school medical service and a school meals service. They were also vigorous in housing inspections according to Housing Acts and Public Health Acts. Based on a closely detailed study of local authority records and National Government Education and Health records, this thesis demonstrates that poverty was widespread; the national government was dilatory in recognising regional variations of long-term structural unemployment which in the Lancashire weaving area was slow to diminish, and that local authorities‟ responses, while ample, could not address the problem of poverty in the area adequately without further funding from central government.
Thesis (Ph.D.) - University of Adelaide, School of History and Politics, 2009
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Books on the topic "OWPT"

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Shaun, Tyas, ed. "We didn't know owt": A study of sexuality, superstition and death in women's lives in Lincolnshire during the 1930s, '40s and '50s. Donington, Lincolnshire: Shaun Tyas, 2012.

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Publishing, Olzo. You're Stressing Me-Owt: Unruled Composition Book. Independently Published, 2019.

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Publishing, Olzo. Don't Stress Me-Owt: Unruled Composition Book. Independently Published, 2019.

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Owt Nowt Summat A Toast To All Tykes. Countryside Books (GB), 2009.

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Garg, Amit, Ashok Kumar, Preecha Yupapin, Manish Tiwari, and Ravi Kumar Maddila. Optical and Wireless Technologies: Proceedings of OWT 2020. Springer Singapore Pte. Limited, 2021.

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Ismail, Yaseera, Karan Verma, Amit Kumar Garg, and Manish Tiwari. Optical and Wireless Technologies: Proceedings of OWT 2021. Springer, 2022.

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d'Alessandro, Antonio, Ghanshyam Singh, Vijay Janyani, and Manish Tiwari. Optical and Wireless Technologies: Proceedings of OWT 2018. Springer Singapore Pte. Limited, 2020.

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Garg, Amit Kumar, Ashok Kumar, Preecha Yupapin, Manish Tiwari, and Ravi Kumar Maddila. Optical and Wireless Technologies: Proceedings of OWT 2020. Springer, 2022.

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Singh, Ghanshyam, Vijay Janyani, and Manish Tiwari. Optical and Wireless Technologies: Proceedings of OWT 2017. Springer, 2018.

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Singh, Ghanshyam, Vijay Janyani, Manish Tiwari, and Tawfik Ismail. Optical and Wireless Technologies: Proceedings of OWT 2019. Springer, 2020.

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Book chapters on the topic "OWPT"

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Wang, Xinrui, and Tien-Fu Lu. "802.11 WLAN OWPT Measurement Algorithms and Simulations for Indoor Localization." In Lecture Notes in Electrical Engineering, 217–29. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-3517-2_17.

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Manzato, Simone, and Bert Pluymers. "OWT Drivetrain & Gearbox Simulation and Testing." In MARE-WINT, 117–21. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39095-6_8.

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Buffoni, David, Nicolas Usunier, and Patrick Gallinari. "LIP6 at INEX’10: OWPC for Ad Hoc Track." In Lecture Notes in Computer Science, 54–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23577-1_4.

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Pearsall, Derek. "G. R. Owst and the Politics of Sermon Studies." In Sermo, 11–30. Turnhout: Brepols Publishers, 2013. http://dx.doi.org/10.1484/m.sermo.1.101583.

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Buffoni, David, Nicolas Usunier, and Patrick Gallinari. "LIP6 at INEX’09: OWPC for Ad Hoc Track." In Focused Retrieval and Evaluation, 59–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14556-8_7.

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Mockute, A., C. Borri, E. Marino, and C. Lugni. "Wind–Wave Loading and Response of OWT Monopiles in Rough Seas." In Lecture Notes in Civil Engineering, 507–18. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12815-9_39.

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van der Wal, Jannes, Peter Eecen, and Jasper Veldman. "Risks and Uncertainties in the Planning Phase of Offshore Wind Projects." In Optimum Decision Making in Asset Management, 334–57. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-0651-5.ch015.

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Megaprojects are large and complex projects that entail multi-actor management, non-standard technology and processes. This chapter aims to explore offshore wind projects (OWPs) as megaprojects, particular in the planning phase. Based on interviews with 26 experts from a variety of backgrounds in the offshore wind industry in The Netherlands, the risks and uncertainties in the planning phase of OWPs and key factors in the decision making process are explored. A framework is presented that depicts the planning phase of an OWP, as well as ten risks and seven uncertainties that are most common in an OWP. The role of the government and the project structure are further highlighted. The findings of this research allow practitioners to gain a better overview of the planning process of an OWP and can help to improve asset management decision making.
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Jha, Pankaj, and Ke Wu. "Orbital Angular Momentum Wave and Propagation." In Recent Microwave Technologies [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104477.

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Orbital angular momentum (OAM) techniques are exploited for a wide range of potential radiofrequency (RF) and electromagnetic applications, including megahertz-through-terahertz wireless systems, fiber-based and free-space optical communications and sensing, just like acoustic and any other wave-based counterparts. In those RF and electromagnetic applications, OAM wave is set to enable the development of high-speed and high-capacity communications, radar imaging, and sensing systems, among many others. In this chapter, a comprehensive comparison between plane wave and OAM wave propagation using a patch antenna as a radiator at 2.45 GHz is presented and discussed. This comparison allows the appreciation of the fundamental properties of the OAM wave when compared against its plane wave counterpart. For simplified comparison and discussion, we will use two abbreviated terms: PWPA for plane-wave patch antenna and OWPA for OAM wave patch antenna. PWPA refers to as planar patch antenna that produces plane waves in far-field, whereas patch antenna that delivers OAM waves in far-field is termed as OWPA. In this context, all physical quantities for wave propagation such as electric field, magnetic field, wave impedance, wave vector, velocity, pitch, and propagation constant are theoretically studied for OAM waves and compared with plane waves. First, OAM wave generation is studied through widely used uniform circular antenna array (UCAA) in literature. Then, plane wave patch antenna (PWPA) and OAM wave patch antenna (OWPA) are designed and verified through simulation and measurement. OWPA is designed with characteristic mode analysis (CMA) based on a lossy substrate to excite a twisting wave at a determined patch location. With this in mind, a comparative investigation of PWPA and OWPA is conducted for different physical parameters. Cylindrical near-field scan clearly shows a helical wave motion for OWPA, whereas a normal plane wave motion for PWPA. Furthermore, the comparison of plane wave and OAM wave propagation is demonstrated using the combination of a Tx–Rx antenna pair. It is observed that the overall signal from OWPA can be received with two PWPAs at an angle as OWPA has a dispersive beam. Moreover, the receiving antenna with a large aperture and plane wave horn antenna (PWHA) in the line of sight (LOS) range can also be used to receive the overall signal from OWPA. The received signal in PWPA–PWPA, OWPA–OWPA, OWPA–PWPA–PWPA, OWPA–PWHA Tx–Rx pairs is thoroughly compared and studied. Measured and simulated results for transmission are −30 dB for 0 dB input signal in OWPA–PWPA–PWPA and OWPA–PWHA cases, which are reasonably justified within the sensitivity/dynamic range of short-distance communication and radar sensing receivers.
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9

Borgman, Jessie C. "The Online Writing Program Administrator (OWPA)." In Handbook of Research on Writing and Composing in the Age of MOOCs, 188–201. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-1718-4.ch012.

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This chapter explores issues specific writing program administration considering the huge influx of online writing courses across the country. The author argues that a pedagogical shift has occurred that requires a change in administering writing programs: teaching online is different that teaching face-to-face. Considering this influx and pedagogical shift, the author argues that in the age of MOOCs, focusing on faculty support and the development and maintenance of online writing courses (OWCs) becomes imperative. The central idea of the chapter is that in order for online writing instructors to focus on what they do best (teaching), they need to be led by someone with online writing instruction (OWI) experience, who is trained and qualified to lead a writing program that includes OWCs. The author argues for the development of a new WPA role, an Online Writing Program Administrator (OWPA), in order to distinguish a brand (a concept from Keith Rhodes, 2010) of OWI, which is distinctly different than the instruction and content offered by MOOCs.
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"Appendix (a) Notes owt of Harrysons booke." In The Writings of Robert Harrison and Robert Browne, 546–51. Routledge, 2004. http://dx.doi.org/10.4324/9780203500903-11.

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Conference papers on the topic "OWPT"

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Kishima, Koichiro, and Takeo Maruyama. "OWPT (Optical Wireless Power Transmission) by image-guided laser-beam steering." In AI and Optical Data Sciences II, edited by Ken-ichi Kitayama and Bahram Jalali. SPIE, 2021. http://dx.doi.org/10.1117/12.2577666.

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Zhao, Mingzhi, and Tomoyuki Miyamoto. "Irradiation Performances Analysis of Multi-LED Optical Wireless Power Transmission System Based on Collimation Scheme." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2021. http://dx.doi.org/10.1364/jsap.2021.10a_n405_2.

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Liu, Yu, and Tomoyuki Miyamoto. "Application of Scattering Characteristics to Module with Filters on Solar Cell for Improvement of OWPT Equipment Appearance." In 2019 24th Microoptics Conference (MOC). IEEE, 2019. http://dx.doi.org/10.23919/moc46630.2019.8982896.

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"OWP - FTTX." In 2005 Optical Fiber Communications Conference Technical Digest. IEEE, 2005. http://dx.doi.org/10.1109/ofc.2005.192879.

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Ren, Nianxin, and Jinping Ou. "Dynamic numerical simulation for ship-OWT collision." In 2009 8th International Conference on Reliability, Maintainability and Safety (ICRMS 2009). IEEE, 2009. http://dx.doi.org/10.1109/icrms.2009.5269985.

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Satpute, Uttam S., and D. R. Joshi. "Optimum frequency-based design of off-shore wind power plant (OWPP)." In 2017 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2017. http://dx.doi.org/10.1109/appeec.2017.8309018.

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Jiang, Bo, Yuan Zhang, Jin Tang, and Bin Luo. "OWP: Objectness Weighted Patch Descriptor for Visual Tracking." In 2018 24th International Conference on Pattern Recognition (ICPR). IEEE, 2018. http://dx.doi.org/10.1109/icpr.2018.8546072.

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Wang, Wenhua, Zhen Gao, Xin Li, Torgeir Moan, and Bin Wang. "Passive Control of a Pentapod Offshore Wind Turbine Under Earthquakes by Using Tuned Mass Damper." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61468.

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The finite element model (FEM) of a pentapod offshore wind turbine (OWT) is established in the newly compiled FAST. The dynamic responses of the OWT are analyzed in detail. Further, a tuned mass damper as a passive control strategy is applied in order to reduce the OWT responses under seismic loads. The influence of the tuned mass damper (TMD) locations, mass and control frequencies on the reduction of OWT responses are investigated. A general configuration of TMD can effectively reduce the local and global responses to some degree, but due to the complexity of characteristics of the OWT structure and seismic waves, the single TMD can not obtain consistent controlling effects.
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Clark, Caitlyn E., Joey Velarde, and Jannie Sønderkær Nielsen. "Fatigue Load Reductions in Offshore Wind Turbine Monopile Foundations in Co-Located Wind-Wave Arrays." In ASME 2018 1st International Offshore Wind Technical Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/iowtc2018-1024.

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As offshore wind turbines (OWTs) increase in size and are placed farther offshore, hydrodynamic loads have increased contribution to total load, resulting in fatigue limit states becoming more important to consider in structural design. Previous literature shows that placing wave energy converters (WECs) peripherally to an OWT array results in a milder wave climate within the array. This reduction could affect the wave loads and fatigue damage of OWT support structures. In this exploratory study, the effect of peripherally-distributing WECs in front of a fixed-bottom OWT on the fatigue of the OWT monopile is investigated. Relative sea state reductions from WECs are quantified, and fully-coupled time-domain fatigue analyses are performed for a 10 MW reference OWT. Results indicate that both a single WEC and a WEC array can lead to up to 8% and 10% fatigue load reduction in unidirectional wave cases, respectively.
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Li, Xin, Wenhua Wang, Zuxing Pan, and Bin Wang. "Vibration Control of a Jacket Offshore Wind Turbine Under Earthquake Wind and Wave Loads by Tuned Mass Damper." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18380.

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Abstract The fully coupled analysis model of a jacket offshore wind turbine (OWT) is established based on the governing equation of motion of the structure which is derived in accordance with the blade element momentum theory (BEM), Morison formula and theories of structural dynamics. The dynamic characteristics and structural responses of the jacket OWT under the different combined seismic cases are analyzed. It can be seen that the interactions of the wind and wave loads are non-negligible in the seismic analysis of an OWT, and the abundant dominant frequencies of the responses of the support system under the combined seismic cases are discovered. Meanwhile, the passive control method of tuned mass dampers (TMD) is applied to the support system of the OWT under the earthquakes, and the influence of the TMD parameters on the reduction of the responses of the support system are investigated. Furthermore, according to the reduction of the structural responses, the suggestions for the design of a TMD under the combined seismic cases for the bottom fixed OWT are summarized.
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