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Chen, Zhaowei (author), Wan, Fangshuang (author), He, C. (author)To maximize the use of urban land, many cities have built buildings above metro depots. However, the low-frequency vibration caused by metro operation affects the lives of surrounding residents, which seriously restricts the further development of over-track buildings. To study this problem, Firstly, the vibration of the metro depot and...journal article 2024
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Madhavan, Aravind Krishna (author)This investigation focuses on the premixed conical flame, a mainstay of combustion diagnostics. While extensive studies have explored high-frequency oscillations in the canonical Bunsen flame, little attention has been given to low-frequency oscillations affecting flame fronts. This thesis aims to explain the origins of these oscillations and...master thesis 2023
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van den Bergh, Michael (author)Energy harvesters subtract energy from their surroundings and convert this to electrical energy. Even though energy output is generally low, energy harvesters can offer great value by offering the possibility of self-sustaining devices, combined with the developments in low power semiconductors. Many examples can be found of applications that...master thesis 2023
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Yan, Jingye (author), Wu, Ji (author), Gurvits, L. (author), Wu, Lin (author), Deng, Li (author), Zhao, Fei (author), Zhou, Li (author), Lan, Ailan (author), Fan, Wenjie (author)This paper introduces the first results of observations with the Ultra-Long-Wavelength (ULW) —- Low Frequency Interferometer and Spectrometer (LFIS) on board the selenocentric satellite Longjiang-2. We present a brief description of the satellite and focus on the LFIS payload. The in-orbit commissioning confirmed a reliable operational status...journal article 2023
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El Sayed, Kareem (author)In this study the contribution of the low-frequency residuals to the sea-level variability has been examined. This is done using 106-year old sea-level record obtained at Hoek van Holland. Computing the mean sea-level per season each year and the corresponding standard deviation one finds an increase in both these features of the sea-level...bachelor thesis 2022
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Hagen, W.R. (author)An EPR spectrometer has been developed that can be tuned to many frequencies in the range of ca 0.1–15 GHz. Applicability has been tested on ferrimyoglobin fluoride (MbF) and ferrimyoglobin cyanide (MbCN). MbF has a high-spin (S = 5/2) spectrum with <sup>19</sup>F superhyperfine splitting that is only resolved in X-band along the heme normal....journal article 2022
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van Puffelen, Kylian (author), Blad, Thijs (author), van Ostayen, R.A.J. (author)Vibrations are a promising source for powering wireless sensors, for example in low-frequency environments like human motion. These environments suffer from unpredictable vibration spectra and their low-frequency and large amplitude characteristics offer great possibilities for mechanisms with double well potential energy characteristics. The...conference paper 2022
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Klöpping, Roelof (author)Settels Savenije van Amelsvoort is interested in investigating the use of piezoelectric shunt damping for a measurement and calibrations setup. The goal is to damp the remaining vibrations from previous vibration isolation stages to sub-nanometre amplitude. There was interest in piezoelectric shunt damping as a damping mechanism. Although...master thesis 2021
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Ghaffarian Niasar, M. (author), Wang, Xiaolei (author), Kiiza, Respicius Clemence (author)When detecting the presence of partial discharge (PD) activity in the insulation system in high-voltage equipment, the excitation voltages at variable frequency have been widely used instead of power-frequency (50/60 Hz) sinusoidal voltage in order to reduce the charging power. This work reviews the relevant research on PD activity at very low...journal article 2021
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Nakayama, Shotaro (author), Blacquière, G. (author)Acquisition of incomplete data, i.e., blended, sparsely sampled, and narrowband data, allows for cost-effective and efficient field seismic operations. This strategy becomes technically acceptable, provided that a satisfactory recovery of the complete data, i.e., deblended, well-sampled, and broadband data, is attainable. Hence, we explore a...journal article 2021
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van de Wetering, E. (author), Blad, Thijs (author), van Ostayen, R.A.J. (author)In this work, a stiffness compensated piezoelectric vibration energy harvester is modelled and tested for low-frequency excitations and large input amplitudes. Attracting magnets are used to introduce a negative stiffness that counteracts the stiffness of the piezoelectric beam. This results into a nearly statically balanced condition and...journal article 2021
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Patrick, Samantha C. (author), Assink, Jelle D. (author), Basille, Mathieu (author), Clusella-Trullas, Susana (author), Clay, Thomas A. (author), den Ouden, O.F.C. (author), Joo, Rocío (author), Evers, L.G. (author), Smets, P.S.M. (author)Seabirds are amongst the most mobile of all animal species and spend large amounts of their lives at sea. They cross vast areas of ocean that appear superficially featureless, and our understanding of the mechanisms that they use for navigation remains incomplete, especially in terms of available cues. In particular, several large-scale...journal article 2021
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Ochôa, Pedro (author), Groves, R.M. (author), Benedictus, R. (author)A reliable damage diagnostic by ultrasonic guided wave (GW) based structural health monitoring (SHM) can only be achieved if the physical interactions between wave propagation, the SHM system and environmental factors are fully understood. The purpose of this research was to gain knowledge about the effects of high-amplitude low-frequency...journal article 2020
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Dely, Alexandre (author), Andriulli, Francesco P. (author), Cools, K. (author)The time domain-electric field integral equation (TD-EFIE) and its differentiated version are widely used to simulate the transient scattering of a time dependent electromagnetic field by a perfect electric conductor (PEC). The time discretization of the TD-EFIE can be achieved by a space-time Galerkin approach or, as it is considered in this...journal article 2020
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Bentum, M. J. (author), Verma, M. K. (author), Rajan, R.T. (author), Boonstra, A. J. (author), Verhoeven, C.J.M. (author), Gill, E.K.A. (author), van der Veen, A.J. (author), Falcke, H. (author), Gurvits, L. (author)The past two decades have witnessed a renewed interest in low frequency radio astronomy, with a particular focus on frequencies above 30 MHz e.g., LOFAR (LOw Frequency ARray) in the Netherlands and its European extension ILT, the International LOFAR Telescope. However, at frequencies below 30 MHz, Earth-based observations are limited due to a...journal article 2020
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Guo, Leicheng (author), Zhu, C. (author), Wu, Xuefeng (author), Wan, Yuanyang (author), Jay, David A. (author), Townend, Ian (author), Wang, Zhengbing (author), He, Qing (author)Tidal waves traveling into estuaries are modified by channel geometry and river flow. The damping effect of river flow on incident astronomical tides is well documented, whereas its impact on low‐frequency tides like MSf and Mm is poorly understood. In this contribution, we employ a numerical model to explore low‐frequency tidal behavior under...journal article 2020
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Gaido, Camila (author)Low-lying islands are highly vulnerable to wave-induced flooding, with low-frequency waves (frequency <0.04Hz) being one of the main drivers. The impact of these inundations can increase due to wave resonance over coral reefs, which has been observed in the range of low-frequency waves. This study aims to understand the reef resonance...master thesis 2019
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Manchanda, Prabhav (author)Space launches have been steadily increasing over the years as satellites are being used in various applications such as communication, military, and science. The costs of launching satellites are still high and depend on the dimensions and weight of the satellite. With the advancement in the field of autonomous robotics and telecommunications,...master thesis 2019
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Rooijers, C.T. (author), Huijsing, J.H. (author), Makinwa, K.A.A. (author)The readout of high-impedance sensors and sampled voltage references [1] requires amplifiers that can achieve both low offset and low input current. Recently, it has been shown that this unique combination can be achieved by an auto-zero (AZ) stabilized buffer [2]. However, its low-frequency noise density is surd 5 times higher than the...conference paper 2019
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Sous, Damien (author), Tissier, M.F.S. (author), Rey, Vincent (author), Touboul, Julien (author), Bouchette, Frédéric (author), Devenon, Jean Luc (author), Chevalier, Cristele (author), Aucan, Jerôme (author)This paper reports a combined observational and numerical study of wave transformation over barrier reefs. The field instrumentation, which consists in a cross-shore network of pressure sensors and one high resolution velocity profiler, has been deployed for more than two months over the Ouano reef barrier, New Caledonia. The combined...journal article 2019