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1
Content available remote Waveform and resistivity data fusion imaging method based on the refection coefficient
Su Maoxin, Han Min, Xue Yiguo, Zhao Ying, Wang Peng, Li Guangkun
Acta Geophysica
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2023
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Vol. 71, no. 1
175--192
EN
To achieve comprehensive analyses, the presentation of comprehensive geophysical results usually involves the use of separate imaging and the combination of various results. At present, few studies have considered the correlation degree and unified imaging of different types of geophysical data. We establish a set of data fusion imaging methods for multiple geophysical data based on their refection coefficients. As geophysical exploration results are primarily provided through waveform and resistivity sections, waveform and resistivity data were selected for fusion and were converted into refection coefficients, and ground-penetrating radar (GPR) and surface electrical resistivity tomography (ERT) were taken as examples. Re-sampling and feature reconstruction were performed to unify the data in space and resolution. Finally, principal component analysis was used to calculate the correlation of the reconstructed refection coefficient and to perform data fusion; this led to unified imaging based on the refection coefficient of the considered geophysical data. Numerical simulation analyses and field experiments proved the efficacy of this method for producing unified imaging of multiple geophysical data. In summary, we provide a novel method for the unified interpretation of multiple geophysical data and enhance the identification ability of geological interfaces and anomaly distribution.
2
Content available remote Comparison of two concepts for modeling of lightning strike into overhead line
Aniserowicz Karol
Przegląd Elektrotechniczny
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2021
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R. 97, nr 12
97--100
EN
The paper presents a comparison of results of determining the lightning current flow in the shield wires of a high voltage line, using the model of lightning in the form of a lumped current generator and the antenna model, which takes the electromagnetic coupling into account. The usability of these two models is discussed.
PL
Przedstawiono porównanie wyników wyznaczenia rozpływu prądu piorunowego w linkach odgromowych linii wysokiego napięcia, z użyciem modelu pioruna w postaci skupionego generatora prądowego oraz modelu antenowego, uwzględniającego sprzężenie elektromagnetyczne. Przedyskutowano użyteczność tych dwóch modeli.
3
Content available remote Modele matematyczne piorunowych udarów prądowych
Aniserowicz Karol
Przegląd Elektrotechniczny
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2020
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R. 96, nr 12
134--139
PL
Opisano wyrażenia matematyczne często stosowane podczas modelowania przebiegów prądu wyładowania atmosferycznego. Przedstawione wzory są użyteczne zarówno podczas obliczeń analitycznych, jak i numerycznych dotyczących analizy zagrożenia piorunowego obiektów i przewodzących instalacji.
EN
Mathematical expressions frequently used for the modeling of the atmospheric discharge current waveforms are described. The presented formulas are useful for both analytical and numerical calculations related to the analysis of lightning hazard of objects and conductive installations.
4
Content available Sets of waveform and mismatched filter pairs for clutter suppression in marine radar application
Koshevyy I.V., Popova V.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2017
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Vol. 11, no. 3
505--510
EN
Sets of waveform and mismatched filter pairs are used. On the contrary with Golays matched waveform filter pair the mismatched waveform filter pair does exist for all N (number pulses in waveform). Using corresponding shapes of filter good Doppler tolerance may be provided. This property together with a good range side-lobs level suppression makes it?s attractable for use in marine radar.
5
Content available remote Empirical wavelet transform-based delineator for arterial blood pressure waveforms
Singh O., Sunkaria R. K.
Bio-Algorithms and Med-Systems
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2016
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Vol. 12, no. 2
61--66
EN
Arterial blood pressure (ABP) waveforms provide plenty of pathophysiological information about the cardiovascular system. ABP pulse analysis is a routine process used to investigate the health status of the cardiovascular system. ABP pulses correspond to the contraction and relaxation phenomena of the human heart. The contracting or pumping phase of the cardiac chamber corresponds to systolic pressure, whereas the resting or filling phase of the cardiac chamber corresponds to diastolic pressure. An ABP waveform commonly comprises systolic peak, diastolic onset, dicrotic notch, and dicrotic peak. Automatic ABP delineation is extremely important for various biomedical applications. In this paper, a delineator for onset and systolic peak detection in ABP signals is presented. The algorithm uses a recently developed empirical wavelet transform (EWT) for the delineation of arterial blood pulses. EWT is a new mathematical tool used to decompose a given signal into different modes and is based on the design of an adaptive wavelet filter bank. The performance of the proposed delineator is evaluated and validated over ABP waveforms of standard databases, such as the MIT-BIH Polysomnoghaphic Database, Fantasia Database, and Multiparameter Intelligent Monitoring in Intensive Care Database. In terms of pulse onset detection, the proposed delineator achieved an average error rate of 0.11%, sensitivity of 99.95%, and positive predictivity of 99.92%. In a similar manner for systolic peak detection, the proposed delineator achieved an average error rate of 0.10%, sensitivity of 99.96%, and positive predictivity of 99.92%.
6
Content available The potential of full-waveform LiDAR in mobile mapping applications
Toth C.K., Zaletnyik P., Laky S., Grejner-Brzezińska D.
Archiwum Fotogrametrii, Kartografii i Teledetekcji
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2011
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Vol. 22
401--410
EN
Full Waveform LiDAR data have been available for many years, yet applications just recently started discovering its potential in airborne topographic surveying. Forestry and earth sciences applications have been traditionally using waveform processing for many years, but topographic mapping has just started exploring the benefits of waveform. The potential advantages are improved point cloud generation, better object surface characterization, and support for object classification. However, there are several implementations and performance issues, such as the availability of waveform processing tools and waveform compression methods that should be addressed before applications can take full advantage of the availability of waveform data. The paper provides an overview of the waveform application potential in both airborne and mobile LiDAR mapping applications.
7
Content available remote Direction-dependent saccadic waveform asymmetry
Walecki P., Lasoń W., Gorzelańczyk E. J.
Bio-Algorithms and Med-Systems
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2008
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Vol. 4, no. 8
73--79
EN
This paper presents response direction-dependent saccadic velocity waveform asymmetry and direction-dependent difference between means of saccadic parameters of eyeball movement such as duration, latency, amplitude, peak velocity. The research was a preparatory study which aimed to determine repetitive patterns in saccadic velocity waveform (SW). The study also aimed to distinguish different types of SW and eyeball movement direction-dependent waveform asymmetry (SWA).
PL
W artykule przedstawiono zależną od kierunku ruchu oczu asymetrię w profilu prędkości sakad i zależną od kierunku ruchu oczu różnicę pomiędzy średnimi wybranych parametrów skokowych ruchów gałek ocznych tj.: czasem trwania, latencją , amplitudą , prędkością szczytową . Badanie ma charakter wstępnego studium, którego celem jest opisanie powtarzających się wzorców profilu prędkości sakad. Celem badania jest również wyodrębnienie różnych przebiegów profili prędkości sakad oraz ich asymetrii, która związana jest z kierunkiem ruchu oczu.
8
Content available remote Video-rate multiplexed driving scheme for passive antiferroelectric liquid crystal displays
Quintana X., Castillo P. L., Otón J. M., Bennis N., Lara A., Urruchi V., Dąbrowski R.
Opto-Electronics Review
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2004
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Vol. 12, No. 3
291-297
EN
Antiferroelectric liquid crystals have been applied to high-end multiplexed displays. The interest on these materials chiefly comes up from their capability of being multiplex addressed with no need of active matrices. Antiferroelectric grey levels arise from a double symmetric hysteresis loop that can be stabilized by a constant holding voltage. Driving schemes are compatible with passive multiplexing, but limitations appear when the multiplexing rate increases. To avoid these limitations, new driving schemes for high multiplexing level at video rate have been designed. The problem of accumulated voltage on bias level arising from data voltages is tackled as well.
9
Content available remote Antiferroelectric liquid crystal displays
Otón J. M., Quintana X., Castillo P. L., Lara A., Urruchi V., Bennis N.
Opto-Electronics Review
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2004
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Vol. 12, No. 3
263-269
EN
In the last few years, the unique features of antiferroelectric liquid crystals (AFLCs) have been explored to develop high-end displays. A number of passive- and active-matrix prototypes have been presented. However, although their use in a number of application areas has been suggested, no commercial products have been announced yet. This work reviews the state of the art of AFLC displays, the reasons for their present low incidence in display markets, and the latest developments aiming to overcome the main shortcomings that hinder their development. V-shape smectic displays are also included in this study. Although not considered strictly antiferroelectrics nowadays, V-shape materials behaviour and scope are similar to traditional AFLCs.
10
Content available remote Antiferroelectric and V-shape liquid crystal on silicon microdisplays
Otón J. M., Dąbrowski R., Quintana X., Urruchi V, Gayo J. L.
Opto-Electronics Review
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2002
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Vol. 10, No. 1
17-21
EN
In this work, the use of antiferroelectric and V-shape liquid crystals for video projection using LCOS microdisplays has been explored. Antiferroelectric grey levels arise from a double symmetric hysteresis loop that can be stabilised by a constant holding voltage, thus an active matrix is not strictly required in this case. If used, then the voltage levels and the waveform must be adjusted to fulfil the voltage limitations dictated by the matrix. V-shape materials lack hysteresis ; therefore the active matrix is mandatory to stabilise the levels. Voltage limitations, however, are less restrictive int his case, since V-shape smectics require just a few volts for full switching.
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