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Article ; Online: A Sensor System for Detecting and Localizing Partial Discharges in Power Transformers with Improved Immunity to Interferences.

Drexler, Petr / Čáp, Martin / Fiala, Pavel / Steinbauer, Miloslav / Kadlec, Radim / Kaška, Miloš / Kočiš, Lubomír

2019 Volume 19, Issue 4

Abstract: The paper reports on the solution, principles, and application results related to a system for diagnosing main transformers in power plants via the radiofrequency method. The subject of the diagnostics is the occurrence of partial discharge activity in ... ...

Abstract	The paper reports on the solution, principles, and application results related to a system for diagnosing main transformers in power plants via the radiofrequency method. The subject of the diagnostics is the occurrence of partial discharge activity in transformers. The technical solution of the system is characterized in the introductory section of the article. There then follows a description of the operating principle and the implemented novel advanced methods for signal detection and source localization. The results obtained from practical application of the system within the diagnostics of high-power transformers are presented as well. Because ambient electromagnetic disturbance was recognized as a major issue during the system development, novel detection methods were proposed, implemented, and verified. The principal approach utilizes an external radiofrequency sensor to detect outer impulse disturbance and to eliminate disturbance-triggered acquisitions, and it also ensures direct real-time visualization of the desired impulse signals. The ability of weak signal detection was verified via artificial impulse signal injection into the transformer. The developed detection methods were completed with localization techniques for signal source estimation. The desired impulse signal was detected and localized during full operation of the main transformer, despite the presence of strong electromagnetic interference.
Language	English
Publishing date	2019-02-22
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s19040923
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Article ; Online: Theoretical assessment of the OTDR detector noise on plasma current measurement in tokamaks.

Motuz, Rastislav / Leysen, Willem / Moreau, Philippe / Gusarov, Andrei / Drexler, Petr / Wuilpart, Marc

Applied optics

2018 Volume 58, Issue 11, Page(s) 2795–2802

Abstract: In this paper, we propose a theoretical study dedicated to the assessment of plasma current measurement in magnetic confinement fusion reactors using a polarization optical time-domain reflectometer (POTDR) setup with a low-birefringence fiber used as ... ...

Abstract	In this paper, we propose a theoretical study dedicated to the assessment of plasma current measurement in magnetic confinement fusion reactors using a polarization optical time-domain reflectometer (POTDR) setup with a low-birefringence fiber used as the sensing fiber. We consider the general case of a non-uniform magnetic-field distribution along the sensing fiber. The numerical simulations, based on Jones formalism taking into account the OTDR noise, provide the measurement error as a function of the plasma current. The measurement performance is evaluated for an ITER-relevant sensor configuration. We demonstrate that a signal-to-noise ratio of 6 dB, achievable in modern POTDRs, allows us to comply with the ITER requirements for plasma currents from 0 to 1 MA, while for the 1 to 20 MA range, the level is relaxed to 4 dB.
Language	English
Publishing date	2018-11-05
Publishing country	United States
Document type	Journal Article
ISSN	1539-4522
ISSN (online)	1539-4522
DOI	10.1364/AO.58.002795
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Article ; Online: First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable E for γp→pπ^{0} and γp→nπ^{+}.

Afzal, F / Spieker, K / Hurck, P / Abt, S / Achenbach, P / Adlarson, P / Ahmed, Z / Akondi, C S / Annand, J R M / Arends, H J / Bashkanov, M / Beck, R / Biroth, M / Borisov, N / Braghieri, A / Briscoe, W J / Cividini, F / Collicott, C / Costanza, S /

Denig, A / Dieterle, M / Downie, E J / Drexler, P / Fegan, S / Gardner, S / Ghosal, D / Glazier, D I / Gorodnov, I / Gradl, W / Gurevich, D / Heijkenskjöld, L / Hornidge, D / Huber, G M / Kashevarov, V L / Kay, S J D / Korolija, M / Krusche, B / Lazarev, A / Livingston, K / Lutterer, S / MacGregor, I J D / Macrae, R G / Manley, D M / Martel, P P / Miskimen, R / Mocanu, M / Mornacchi, E / Mullen, C / Neganov, A / Neiser, A / Oberle, M / Ostrick, M / Otte, P B / Paudyal, D / Pedroni, P / Powell, A / Reicherz, G / Rostomyan, T / Sfienti, C / Sokhoyan, V / Steffen, O / Strakovsky, I I / Strub, T / Supek, I / Thiel, A / Thiel, M / Thomas, A / Usov, Yu A / Wagner, S / Walford, N K / Watts, D P / Werthmüller, D / Wettig, J / Witthauer, L / Wolfes, M / Zachariou, N

Physical review letters

2024 Volume 132, Issue 12, Page(s) 121902

Abstract: We report the measurement of the helicity asymmetry E for the pπ^{0} and nπ^{+} final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. ... ...

Abstract	We report the measurement of the helicity asymmetry E for the pπ^{0} and nπ^{+} final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. The results agree very well with data that were taken with a circularly polarized photon beam, showing that it is possible to simultaneously measure polarization observables that require linearly (e.g., G) and circularly polarized photons (e.g., E) and a longitudinally polarized target. The new data cover a photon energy range 270-1400 MeV for the pπ^{0} final state (230-842 MeV for the nπ^{+} final state) and the full range of pion polar angles, θ, providing the most precise measurement of the observable E. A moment analysis gives a clear observation of the pη cusp in the pπ^{0} final state.
Language	English
Publishing date	2024-04-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.132.121902
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Book: Rotational grazing of sheep to control weeds in Christmas trees

Drexler, Paulie

1996

Author's details	project coordinator: Paulie Drexler
Keywords	Weeds/Control. ; Sheep. ; Rotational grazing. ; Christmas trees.
Language	English
Size	1 portfolio.
Publisher	Paulie Drexler
Publishing place	Fabius, NY
Document type	Book
Note	SARE project no.: FNE96-126. ; Contains: final report (1996)
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton.

Mornacchi, E / Martel, P P / Abt, S / Achenbach, P / Adlarson, P / Afzal, F / Ahmed, Z / Annand, J R M / Arends, H J / Bashkanov, M / Beck, R / Biroth, M / Borisov, N / Braghieri, A / Briscoe, W J / Cividini, F / Collicott, C / Costanza, S / Denig, A /

Dolzhikov, A S / Downie, E J / Drexler, P / Fegan, S / Gardner, S / Ghosal, D / Glazier, D I / Gorodnov, I / Gradl, W / Günther, M / Gurevich, D / Heijkenskjöld, L / Hornidge, D / Huber, G M / Käser, A / Kashevarov, V L / Kay, S J D / Korolija, M / Krusche, B / Lazarev, A / Livingston, K / Lutterer, S / MacGregor, I J D / Manley, D M / Miskimen, R / Mocanu, M / Mullen, C / Neganov, A / Neiser, A / Ostrick, M / Paudyal, D / Pedroni, P / Powell, A / Rostomyan, T / Sokhoyan, V / Spieker, K / Steffen, O / Strakovsky, I / Strub, T / Thiel, M / Thomas, A / Usov, Yu A / Wagner, S / Watts, D P / Werthmüller, D / Wettig, J / Wolfes, M / Zachariou, N

Physical review letters

2022 Volume 128, Issue 13, Page(s) 132503

Abstract: A precise measurement of the differential cross sections dσ/dΩ and the linearly polarized photon beam asymmetry Σ_{3} for Compton scattering on the proton below pion threshold has been performed with a tagged photon beam and almost 4π detector at the ... ...

Abstract	A precise measurement of the differential cross sections dσ/dΩ and the linearly polarized photon beam asymmetry Σ_{3} for Compton scattering on the proton below pion threshold has been performed with a tagged photon beam and almost 4π detector at the Mainz Microtron. The incident photons were produced by the recently upgraded Glasgow-Mainz photon tagging facility and impinged on a cryogenic liquid hydrogen target, with the scattered photons detected in the Crystal Ball/TAPS setup. Using the highest statistics Compton scattering data ever measured on the proton along with two effective field theories (both covariant baryon and heavy-baryon) and one fixed-t dispersion relation model, constraining the fits with the Baldin sum rule, we have obtained the proton electric and magnetic polarizabilities with unprecedented precision: α_{E1}=10.99±0.16±0.47±0.17±0.34, β_{M1}=3.14±0.21±0.24±0.20±0.35; in units of 10^{-4} fm^{3} where the errors are statistical, systematic, spin polarizability dependent, and model dependent.
Language	English
Publishing date	2022-04-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.128.132503
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Article: Surface hardness of a resin composite cured with a transparent cone.

Drexler, P / García-Godoy, F / Boj, J R

Pediatric dentistry

1997 Volume 19, Issue 6, Page(s) 419–420

Abstract: The purpose of this study was to evaluate the surface hardness of a resin composite (TPH) polymerized with and without the use of a transparent light-curing cone. Twenty composite blocks were made on a Teflon mold with cylindrical holes of 3 mm depth and ...

Abstract	The purpose of this study was to evaluate the surface hardness of a resin composite (TPH) polymerized with and without the use of a transparent light-curing cone. Twenty composite blocks were made on a Teflon mold with cylindrical holes of 3 mm depth and 6 mm radius, and were light cured following different procedures. Group 1: Ten samples were pressed with a glass slide and light cured for two 40-sec exposures without the plastic cone; Group 2: Ten samples were light cured using the transparent plastic cone which was pressed down into the composite until the tip was 1 mm from the floor of the cylindrical Teflon mold. The curing light was activated for 40 sec. The cone was then removed and the remaining part of the mold was filled in one portion, pressed with a glass slide, and light cured for 40 sec. After curing, the samples were placed in distilled water for 48 hr. The hardness of the samples was then measured with a Rockwell Hardness Tester at three different points on each composite block; therefore, 30 measurements per group were taken. The data were statistically analyzed using an unpaired Student's t test. The results revealed that the resin composite cured with the transparent plastic cone had a statistically significant higher surface hardness value (P < 0.0001) than the group cured without the cone.
MeSH term(s)	Composite Resins/chemistry ; Glass ; Hardness ; Humans ; Immersion ; Light ; Materials Testing ; Plastics ; Polymers/chemistry ; Polytetrafluoroethylene ; Surface Properties ; Time Factors ; Water
Chemical Substances	Composite Resins ; Plastics ; Polymers ; Prisma TPH resin composite ; Water (059QF0KO0R) ; Polytetrafluoroethylene (9002-84-0)
Language	English
Publishing date	1997-09
Publishing country	United States
Document type	Journal Article
ZDB-ID	604709-9
ISSN	1942-5473 ; 0164-1263
ISSN (online)	1942-5473
ISSN	0164-1263
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Article ; Online: Measurement of polarization observables

Jermann, N / Krusche, B / Metag, V / Afzal, F / Badea, M / Beck, R / Bielefeldt, P / Bieling, J / Biroth, M / Blanke, E / Borisov, N / Bornstein, M / Brinkmann, K-T / Ciupka, S / Crede, V / Dolzhikov, A / Drexler, P / Dutz, H / Elsner, D /

Fedorov, A / Frommberger, F / Gardner, S / Ghosal, D / Goertz, S / Gorodnov, I / Grüner, M / Hammann, C / Hartmann, J / Hillert, W / Hoffmeister, P / Honisch, C / Jude, T C / Kalischewski, F / Ketzer, B / Klassen, P / Klein, F / Klempt, E / Knaust, J / Kolanus, N / Kreit, J / Krönert, P / Lang, M / Lazarev, A B / Livingston, K / Lutterer, S / Mahlberg, P / Meier, C / Meyer, W / Mitlasoczki, B / Müllers, J / Nanova, M / Neganov, A / Nikonov, K / Noël, J F / Ostrick, M / Ottnad, J / Otto, B / Penman, G / Poller, T / Proft, D / Reicherz, G / Reinartz, N / Richter, L / Runkel, S / Salisbury, B / Sarantsev, A V / Schaab, D / Schmidt, C / Schmieden, H / Schultes, J / Seifen, T / Spieker, K / Stausberg, N / Steinacher, M / Taubert, F / Thiel, A / Thoma, U / Thomas, A / Urban, M / Urff, G / Usov, Y / van Pee, H / Wang, Y C / Wendel, C / Wiedner, U / Wunderlich, Y

The European physical journal. A, Hadrons and nuclei

2023 Volume 59, Issue 10, Page(s) 232

Abstract: The target ... ...

Abstract	The target asymmetry
Language	English
Publishing date	2023-10-17
Publishing country	France
Document type	Journal Article
ZDB-ID	1459066-9
ISSN	1434-601X ; 1434-6001
ISSN (online)	1434-601X
ISSN	1434-6001
DOI	10.1140/epja/s10050-023-01134-0
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Book ; Thesis: Literatur, Recht, Kriminalität

Drexler, Peter

Untersuchungen zur Vorgeschichte des englischen Detektivromans 1830-1890

(Studien zur Germanistik und Anglistik ; 7)

1991

Author's details	Peter Drexler
Series title	Studien zur Germanistik und Anglistik ; 7
Keywords	Verbrechen ; Kriminalliteratur ; Trivialliteratur ; Englisch
Language	German
Size	VIII, 233 S
Publisher	Lang
Publishing place	Frankfurt am Main u.a.
Document type	Book ; Thesis
Thesis / German Habilitation thesis	Techn. Univ., Habil.-Schr.--Braunschweig, 1987
ISBN	3631435053 ; 9783631435052
Database	Former special subject collection: coastal and deep sea fishing

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Article ; Online: Comparison of seven commercial SARS-CoV-2 rapid point-of-care antigen tests

Victor M Corman, MD / Verena Claudia Haage, PhD / Tobias Bleicker, RT / Marie Luisa Schmidt, RT / Barbara Mühlemann, PhD / Marta Zuchowski, PhD / Wendy K Jo, PhD / Patricia Tscheak, RT / Elisabeth Möncke-Buchner, DiplBiol / Marcel A Müller, PhD / Andi Krumbholz, PhD / Jan Felix Drexler, ProfMD / Christian Drosten, ProfMD

The Lancet Microbe, Vol 2, Iss 7, Pp e311-e

a single-centre laboratory evaluation study

2021 Volume 319

Abstract: Summary: Background: Antigen point-of-care tests (AgPOCTs) can accelerate SARS-CoV-2 testing. As some AgPOCTs have become available, interest is growing in their utility and performance. Here we aimed to compare the analytical sensitivity and specificity ...

Abstract	Summary: Background: Antigen point-of-care tests (AgPOCTs) can accelerate SARS-CoV-2 testing. As some AgPOCTs have become available, interest is growing in their utility and performance. Here we aimed to compare the analytical sensitivity and specificity of seven commercially available AgPOCT devices. Methods: In a single-centre, laboratory evaluation study, we compared AgPOCT products from seven suppliers: the Abbott Panbio COVID-19 Ag Rapid Test, the RapiGEN BIOCREDIT COVID-19 Ag, the Healgen Coronavirus Ag Rapid Test Cassette (Swab), the Coris BioConcept COVID-19 Ag Respi-Strip, the R-Biopharm RIDA QUICK SARS-CoV-2 Antigen, the nal von minden NADAL COVID-19 Ag Test, and the Roche-SD Biosensor SARS-CoV Rapid Antigen Test. Tests were evaluated on recombinant SARS-CoV-2 nucleoprotein, cultured endemic and emerging coronaviruses, stored respiratory samples with known SARS-CoV-2 viral loads, stored samples from patients with respiratory pathogens other than SARS-CoV-2, and self-sampled swabs from healthy volunteers. We estimated analytical sensitivity in terms of approximate viral concentrations (quantified by real-time RT-PCR) that yielded positive AgPOCT results, and specificity in terms of propensity to generate false-positive results. Findings: In 138 clinical samples with quantified SARS-CoV-2 viral load, the 95% limit of detection (concentration at which 95% of test results were positive) in six of seven AgPOCT products ranged between 2·07 × 106 and 2·86 × 107 copies per swab, with an outlier (RapiGEN) at 1·57 × 1010 copies per swab. The assays showed no cross-reactivity towards cell culture or tissue culture supernatants containing any of the four endemic human coronaviruses (HCoV‑229E, HCoV‑NL63, HCoV‑OC43, or HCoV‑HKU1) or MERS-CoV, with the exception of the Healgen assay in one repeat test on HCoV-HKU1 supernatant. SARS-CoV was cross-detected by all assays. Cumulative specificities among stored clinical samples with non-SARS-CoV-2 infections (n=100) and self-samples from healthy volunteers (n=35; ...
Keywords	Medicine (General) ; R5-920 ; Microbiology ; QR1-502
Language	English
Publishing date	2021-07-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Measurement of the helicity dependence for single π0 photoproduction from the deuteron

Cividini, Federico / Dieterle, Michael / Abt, S. / Achenbach, Patrik / Adlarson, P. / Afzal, F. / Ahmed, Zafar / Annand, John R.M. / Arends, Hans Jürgen / Bashkanov, Mikhail / Beck, Reinhard / M. Biroth / Borisov, N. / Braghieri, A. / Briscoe, W.J. / Collicott, Cristina / Costanza, Susanna / Denig, A. / Dolzhikov, A.S. /

Downie, E.J. / Drexler, P. / Fegan, Suzanne / Fix, A. / Gardner, S. / Ghosal, D. / Glazier, D.I. / Gorodnov, I. / Gradl, W. / Günther, M. / Gurevich, D. / Heijkenskjöld, L. / Hornidge, D. / Huber, G.M. / Käser, A. / Kashevarov, V.L. / Kay, S.J.D. / Korolija, M. / Krusche, B. / Lazarev, A. / Livingston, K. / Lutterer, S. / MacGregor, I.J.D. / Manley, D.M. / Martel, P.P. / Miskimen, R. / Mocanu, M. / Mornacchi, E. / Mullen, C. / Neganov, A. / Neiser, A. / Ostrick, M. / Paudyal, D. / Pedroni, P. / Powell, A. / Rostomyan, T. / Sokhoyan, V. / Spieker, K. / Steffen, O. / Strakovsky, I. / Strub, T. / Thiel, A. / Thiel, M. / Thomas, A. / Usov, Yu.A. / Wagner, S. / Watts, D.P. / Werthmüller, D. / Wettig, J. / Witthauer, L. / Wolfes, M. / Zachariou, N.

2022

Abstract: The helicity-dependent single π0 photoproduction cross section on the deuteron and the angular dependence of the double polarisation observable E for the quasi-free single π0 production off the proton and the neutron have been measured, for the first ... ...

Abstract	The helicity-dependent single π0 photoproduction cross section on the deuteron and the angular dependence of the double polarisation observable E for the quasi-free single π0 production off the proton and the neutron have been measured, for the first time, from the threshold region up to the photon energy 1.4 GeV. The experiment was performed at the tagged photon facility of the MAMI accelerator and used a circularly polarised photon beam and longitudinally polarised deuteron target. The reaction products were detected using the large acceptance Crystal Ball/TAPS calorimeter, which covered 97% of the full solid angle. Comparing the cross section from the deuteron with the sum of free nucleon cross sections provides a quantitative estimate of the effects of the nuclear medium on pion production. In contrast, comparison of the E helicity asymmetry data from quasi-free protons off deuterium with data from a free proton target indicates that nuclear effects do not significantly affect this observable. As a consequence, it is deduced that the helicity asymmetry E on a free neutron can be reliably extracted from measurements on a deuteron in quasi-free kinematics. 58 6
Keywords	DDC::500 Naturwissenschaften und Mathematik::530 Physik
Subject code	530
Language	English
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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