Searched for: subject%3A%22polarization%22
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Derkink, F.M. (author), Doelman, D. (author), van Dam, D. (author), Brenny, B.J.M. (author), Speet, B.G. (author), van Brug, H. (author), Keller, C. (author), Snik, F. (author)
While the concentrations of trace gases in Earth’s atmosphere were roughly constant for thousands of years, human activities such as the burning of fossil fuels have caused significant changes ever since the industrial revolution. The remote sensing of trace gases has proved to be a useful technique for mapping and monitoring on the global scale...
conference paper 2022
document
Yamaguchi, S. (author), van Aken, B.B. (author), Stodolny, M.K. (author), Loffler, J. (author), Masuda, A. (author), Ohdaira, K. (author)
System voltages can cause significant degradation in photovoltaic modules. Polarization-type potential-induced degradation (PID) is accompanied by decreases in the short-circuit current density and the open-circuit voltage. The system voltage causes a polarization and surface charge accumulation, increasing the interface recombination. The...
article 2021
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Ericsson, A. (author), Sjoberg, D. (author), Gerini, G. (author), Cappellin, C. (author), Jensen, F. (author), Balling, P. (author), Fonseca, N.J.G. (author), de Maagt, P. (author)
We present antenna system using a circular polarization selective surface (CPSS) to realize a circular polarization (CP) equivalent to the widely used linear polarization (LP) gridded or dual-gridded reflector (DGR). The CPSS is realized by a multilayer stack of nonresonant anisotropic meander line surfaces, achieving a very wide bandwidth. The...
article 2020
document
Pita-Vidal, M. (author), Bargerbos, A. (author), Yang, C.-K. (author), van Woerkom, D.J. (author), Pfaff, W. (author), Haider, S.N. (author), Krogstrup, P. (author), Kouwenhoven, L.P. (author), de Lange, G. (author), Kou, A. (author)
article 2020
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Pairon, T. (author), Karki, S. (author), Monni, S. (author), Craeye, C. (author)
A fully metallic monopole element is proposed for satellite SAR antennas. This element has significant gain in the broadside direction thanks to its curved arm. This element is then studied in a large sparse array. A fast analysis technique is presented in order to solve for the currents of few hundreds elements, which correspond approximately...
conference paper 2019
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Janssen, G.J.M. (author), Stodolny, M.K. (author), van Aken, B.B. (author), Loffler, J. (author), Lamers, M.W.P.E. (author), Tool, C.J.J. (author), Romijn, I.G. (author)
Potential-induced degradation in n-type modules is typically associated with a surface polarization effect. This paper shows that modifications at the cell level can minimize the potential-induced degradation of modules caused by a polarization effect. As is demonstrated on n-PERT cells, the potentialinduced degradation can be reduced...
article 2019
document
Kooi, F.L. (author), Toet, A. (author), Hoving, S. (author)
Background. A Head Mounted Display (HMD) is unlike all other displays fixed to the head, making eye movements the sole option to scan the display. While the largest saccades easily exceed 50 deg (Collewijn et al., 1988), naturally occurring saccades typically stay within 15 degrees (Adler & Stark, 1975). While attractive for many applications, a...
public lecture 2019
document
Kooi, F.L. (author), Toet, A. (author), Hoving, S. (author)
Background. A Head Mounted Display (HMD) is unlike all other displays fixed to the head, making eye movements the sole option to scan the display. While the largest saccades easily exceed 50 deg (Collewijn et al., 1988), naturally occurring saccades typically stay within 15 degrees (Adler & Stark, 1975). While attractive for many applications, a...
public lecture 2019
document
Khan, M.A. (author), Simão Ferreira, C. (author), Schepers, G.J. (author), Sørensen, N.N. (author)
Spectral analysis was performed on the time series data computed from pressure measurements on the New MEXICO (Model Rotor Experiments under Controlled Conditions) rotor in standstill conditions. As a priori, 3D airfoil polars were recreated from standstill measurements and compared against 2D airfoil polars and flat plate theory results to...
article 2019
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Galgani, G. (author), Scozza, G. (author), Bolt, R.J. (author), Haider, N. (author), Monni, S. (author), Delbary, F. (author)
In this work we present the first phase results in the design of a fixed beam dual-polarized antenna at X-band for a polarimetric weather radar to be mounted on aircraft. Such a radar is not yet existent. Requirements pertinent to the application are presented and the different antenna system components described together with their simulated...
conference paper 2018
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Ba, A. (author), van den Heuvel, J. (author), Mateman, P. (author), Zhou, C. (author), Busze, B. (author), Song, M. (author), He, Y. (author), Ding, M. (author), Dijkhuis, J. (author), Tiurin, E. (author), Madampu, S. (author), Boer, P. (author), Traferro, S. (author), Zhang, Y. (author), Liu, Y.-H. (author), Bachmann, C. (author), Philips, K. (author)
A WiFi (IEEE 802.11g) and BLE combo transmitter (TX) for IoT applications is presented. A wideband digital polar architecture consisting of an all-digital PLL-based frequency modulator and a switched-capacitor digitally-controlled PA achieves optimal energy efficiency for both WiFi and BLE. The dynamic FM correction and AM alias suppression...
conference paper 2018
document
van Amerongen, A. (author), Rietjens, J. (author), Campo, J. (author), Dogan, E. (author), DIngjan, J. (author), Nalla, R. (author), Caron, J.F. (author), Hasekamp, O. (author)
We have developed a 6 dm3-sized optical instrument to characterize the microphysical properties of fine particulate matter or aerosol in the Earth atmosphere from low Earth orbit. Our instrument can provide detailed and worldwide knowledge of aerosol amount, type and properties. This is important for climate and ecosystem science and human...
conference paper 2018
document
Laan, E. (author), Stam, D. (author), Snik, F. (author), Karalidi, T. (author), Keller, C. (author), ter Horst, R. (author), Navarro, R. (author), Oomen, G. (author), de Vries, J. (author), Hoogeveen, R. (author), TNO Industrie en Techniek (author)
SPEX (Spectropolarimeter for Planetary EXploration) is an innovative, compact remotesensing instrument for measuring and characterizing aerosols in the atmosphere. The shoebox size instrument is capable of accurate full linear spectropolarimetry without moving parts or liquid crystals. High precision polarimetry is performed through encoding the...
conference paper 2017
document
Zhao, D. (author), Lenz, T. (author), Katsouras, I. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
In this work, the macroscopic polarization of a ferroelectric capacitor is correlated with the local domain morphology. To this end, a ferroelectric capacitor of the random copolymer poly(vinylidenefluoride-trifluoroethylene) [P(VDF-TrFE)] is poled to a set polarization state in a Sawyer-Tower setup. After chemically removing the top electrode,...
article 2017
document
Yepes, C. (author), Cavallo, D. (author), Neto, A. (author), Gandini, E. (author), Monni, S. (author), van Vliet, F.E. (author)
conference paper 2017
document
Galgani, G. (author), Scozza, G. (author), Bolt, R.J. (author), Haider, N. (author), Monni, S. (author), Delbary, F. (author)
In this work we present the first phase results in the design of a fixed beam dual-polarized antenna at X-band for a polarimetric weather radar to be mounted on aircraft. Such a radar is not yet existent. Requirements pertinent to the application are presented and the different antenna system components described together with their simulated...
conference paper 2017
document
Bolt, R.J. (author), Cavallo, D. (author), Gerini, G. (author), Deurloo, D. (author), Grooters, R. (author), Neto, A. (author), Toso, G. (author)
In this paper, we present the characterization of a Ku-band connected-dipole array for mobile Satcom application. The prototype array consists of 2 × 256 dipole radiators arranged in a square grid, to form 16 × 16 dual-polarized cells. It has been designed to operate over a wideband ranging from 10.7 to 14.5 GHz (30%), accommodating in a single...
article 2016
document
Lenz, T. (author), Sharifi Dehsari, H. (author), Asadi, K. (author), Blom, P.W.M. (author), Groen, W.A. (author), de Leeuw, D.M. (author)
We demonstrate that ferroelectric memory diodes can be utilized as switching type positive temperature coefficient (PTC) thermistors. The diode consists of a phase separated blend of a ferroelectric and a semiconducting polymer stacked between two electrodes. The current through the semiconducting polymer depends on the ferroelectric...
article 2016
document
Zhao, D. (author), Katsouras, I. (author), Asadi, K. (author), Groen, W.A. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
A homogeneous ferroelectric single crystal exhibits only two remanent polarization states that are stable over time, whereas intermediate, or unsaturated, polarization states are thermodynamically instable. Commonly used ferroelectric materials however, are inhomogeneous polycrystalline thin films or ceramics. To investigate the stability of...
article 2016
document
Donovan, D.P. (author), Klein Baltink, H. (author), Henzing, J.S. (author), de Roode, S.R. (author), Siebesma, A.P. (author)
The fact that polarisation lidars measure a depolarisation signal in liquid clouds due to the occurrence of multiple scattering is well known. The degree of measured depolarisation depends on the lidar characteristics (e.g. wavelength and receiver field of view) as well as the cloud macrophysical (e.g. cloud-base altitude) and microphysical (e.g...
article 2015
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