ORCID Profile
0000-0003-3042-136X
Current Organisations
Al-Balqa' Applied University
,
Stefan-Meyer-Institut für subatomare Physik
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Publisher: IOP Publishing
Date: 06-06-2014
Publisher: Elsevier
Date: 2008
Publisher: EDP Sciences
Date: 2018
DOI: 10.1051/EPJCONF/201818101003
Abstract: The ASACUSA Collaboration at CERNs Antiproton Decelerator aims to measure the ground state hyperfine splitting of antihydrogen with high precision to test the fundamental symmetry of CPT (combination of charge conjugation, parity transformation, and time reversal). For this purpose an antihydrogen detector has been developed. Its task is to count the arriving antihydrogen atoms and therefore distinguish backgroundevents (mainly cosmics) from antiproton annihilations originating from antihydrogen atoms which are produced only in small amounts. A central BGO crystal disk with position sensitive read-out detects the annihilation and a surrounding two-layered hodoscope is used for tracking charged secondaries. The hodoscope has been recently upgraded to allow precise vertex reconstruction. A machine learning analysis based on measured antiproton annihilations and cosmic rays has been developed to identify antihydrogen events.
Publisher: Cambridge University Press (CUP)
Date: 10-2023
Publisher: IOP Publishing
Date: 20-02-2006
Publisher: IOP Publishing
Date: 11-10-2005
Publisher: Springer Science and Business Media LLC
Date: 17-12-2018
Publisher: IOP Publishing
Date: 13-05-2019
Publisher: IOP Publishing
Date: 2022
DOI: 10.1088/1755-1315/971/1/012014
Abstract: In this study, waste denim fiber (WDF) was used as a modifier to enhance the properties of bitumen incorporating tire pyrolysis oil (TPO). The designing of the experiment, analysis data, modeling and multi-objective optimization performed using response surface methodology (RSM). Base bitumen was modified with 0%, 5%, 10% and 15% TPO and 0%, 2%, 4% and 6% of WDF using high shear mixer. The interaction effects of TPO and WDF on the penetration, softening point and temperature susceptibility of bitumen were evaluated. Results showed that the addition of TPO and/or WDF has a significant effect on the consistency and temperature susceptibility of base bitumen. RSM analysis exhibited high degrees of correlation (R 2 ) of 0.982, 0.973 and 0.947 for the dependent variables’ penetration, softening point and temperature susceptibility, respectively. That indicates there is an adequate agreement between models developed by RSM and experimental results. The numerical multi-objective optimization showed that optimum properties can be achieved with 8.4% of TPO and 6% of WDF.
Publisher: AIP Publishing
Date: 08-2022
DOI: 10.1063/5.0093360
Abstract: Magnetized nonneutral plasma composed of electrons or positrons couples to the local microwave environment via cyclotron radiation. The equilibrium plasma temperature depends on the microwave energy density near the cyclotron frequency. Fine copper meshes and cryogenic microwave absorbing material were used to lower the effective temperature of the radiation environment in ASACUSA's Cusp trap, resulting in significantly reduced plasma temperature.
Publisher: Elsevier BV
Date: 02-2008
Publisher: Springer Science and Business Media LLC
Date: 08-2014
Publisher: Springer Science and Business Media LLC
Date: 03-2014
Publisher: IOP Publishing
Date: 05-11-2012
Publisher: Springer Science and Business Media LLC
Date: 03-2021
DOI: 10.1140/EPJD/S10053-021-00101-Y
Abstract: The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration plans to measure the ground-state hyperfine splitting of antihydrogen in a beam at the CERN Antiproton Decelerator with initial relative precision of $$10^{-6}$$ 10 - 6 or better, to test the fundamental CPT (combination of charge conjugation, parity transformation and time reversal) symmetry between matter and antimatter. This challenging goal requires a polarised antihydrogen beam with a sufficient number of antihydrogen atoms in the ground state. The first measurement of the quantum state distribution of antihydrogen atoms in a low magnetic field environment of a few mT is described. Furthermore, the data-driven machine learning analysis to identify antihydrogen events is discussed.
Publisher: Springer Science and Business Media LLC
Date: 07-11-2016
Publisher: Begell House
Date: 2018
Publisher: MDPI AG
Date: 07-06-2021
DOI: 10.3390/COMPUTATION9060066
Abstract: In this paper, we investigate wave attenuation caused by mangroves as a porous media. A 1-D mathematical model is derived by modifying the shallow water equations (SWEs). Two approaches are used to involve the existing of mangrove: friction term and diffusion term. The model will be solved analytically using the separation of variables method and numerically using a staggered finite volume method. From both methods, wave transmission coefficient will be obtained and used to observe the d ing effect induced by the porous media. Several comparisons are shown to examine the accuracy and robustness of the derived numerical scheme. The results show that the friction coefficient, diffusion coefficient and vegetation’s length have a significant effect on the transmission coefficient. Moreover, numerical observation is extended to a 2-D SWEs, where we conduct a numerical simulation over a real bathymetry profile. The results from the 2-D numerical scheme will be validated using the data obtained from the field measurement which took place in Demak, Central Java, Indonesia. The results from this research will be beneficial to determine the characteristics of porous structures used for coastal protection.
Publisher: American Physical Society (APS)
Date: 18-07-2018
Publisher: IOP Publishing
Date: 2010
Publisher: IOP Publishing
Date: 2010
Publisher: IOP Publishing
Date: 2010
Publisher: Elsevier BV
Date: 06-2006
Publisher: Elsevier BV
Date: 02-2005
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4796069
Publisher: American Physical Society (APS)
Date: 19-02-2010
Publisher: American Physical Society (APS)
Date: 04-2009
Publisher: Elsevier BV
Date: 2023
Publisher: AIP Publishing
Date: 10-2023
DOI: 10.1063/5.0162339
Publisher: Springer Science and Business Media LLC
Date: 12-2017
Publisher: Journal of the Physical Society of Japan
Date: 23-11-2017
Publisher: American Physical Society (APS)
Date: 13-03-2018
Publisher: AIP Publishing
Date: 09-09-2015
DOI: 10.1063/1.4930033
Abstract: The efficiency of tungsten meshes and thin foils for moderation of fast positrons from 22Na has been investigated in transmission geometry and a fair agreement has been found with previous experimental results where directly comparable. For foils, the dependence on material thickness is found to be similar to the prediction of the Vehanen-Mäkinen diffusion model however, the magnitude is 5–10 times lower. A broad consensus is observed between experiment and the results of a three-dimensional model developed in this work. For a given thickness, meshes are found to be generally better than foils by around a factor of 10 with a maximum efficiency (∼10−3) comparable to that achieved with thin single crystal foils, in accord with previous measurements and the results of the present model.
Publisher: American Physical Society (APS)
Date: 03-09-2014
Publisher: IOP Publishing
Date: 11-2009
Publisher: IOP Publishing
Date: 07-09-2015
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Start Date: 2019
End Date: 2022
Funder: FWF Austrian Science Fund
View Funded Activity