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- Hiyama, T, et al.
(författare)
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Wind speed measurements in upper and lower boundary layer to determine regional momentum fluxes
- 1999
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Ingår i: AGRICULTURAL AND FOREST METEOROLOGY. - : ELSEVIER SCIENCE BV. - 0168-1923. ; 98-9, s. 145-158
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Tidskriftsartikel (refereegranskat)abstract
- Radiosonde profiles in the atmospheric boundary layer (ABL) with other supporting measurements obtained during NOPEX Second Concentrated Field Effort over a complex area in Sweden were analyzed to determine regional momentum fluxes. Two methods were explo
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- Molder, M, et al.
(författare)
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Regional sensible heat flux and thermal roughness length of an inhomogeneous landscape
- 1998
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Ingår i: HYDROLOGICAL PROCESSES. - : JOHN WILEY & SONS LTD. - 0885-6087. ; 12:13-14, s. 2115-2131
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Knowledge of regional roughness parameters is needed for remote sensing and large-scale modelling purposes. The presently available estimates of the most problematic parameter, namely the regional thermal roughness length (z(0t)), have mostly been determi
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| 8. |
- Yamashita, T., et al.
(författare)
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Towards prediction of the rates of antihydrogen positive ion production in antihydrogen-excited positronium reaction
- 2020
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Ingår i: 31St International Conference On Photonic, Electronic And Atomic Collisions (Icpeac Xxxi). - : IOP PUBLISHING LTD.
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Konferensbidrag (refereegranskat)abstract
- We present the 4-body calculation of the antihydrogen-positronium scattering aiming at the prediction of cross sections for the production of antihydrogen positive ions. The latter are expected to be a useful source of ultra-cold atoms for the test of matter-antimatter gravity. We convert the Schrodinger equation to a set of coupled integro-di fferential equations that involve intermediate states and are solved using the compact finite di fference method. We will present the investigation of the rearrangement reaction between the ground-state antihydrogen atom and the excited positronium.
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| 9. |
- Yamashita, T., et al.
(författare)
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Towards prediction of the rates of antihydrogen positive ion production in collision of antihydrogen with excited positronium
- 2020
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Ingår i: 31St International Conference On Photonic, Electronic And Atomic Collisions (Icpeac Xxxi). - : IOP PUBLISHING LTD.
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Konferensbidrag (refereegranskat)abstract
- We present a 4-body calculation of scattering between an antihydrogen atom ((H) over bar) and a positronium (Ps) aiming at the prediction of cross sections for the production of antihydrogen positive ions (($H) over bar (+)). The antihydrogen positive ions are expected to be a useful source of ultra-cold anti-atoms for the test of matter-antimatter gravity. We convert the Schrodinger equation to a set of coupled integro-differential equations that involve intermediate states which facilitate the internal region description of the scattering wavefunction. They are solved using a compact finite difference method. Our framework is extended to scattering between an excited Ps and (H) over bar. Cross sections of the reactions, Ps (1s/2s/3s) + (H) over bar -> e(-) + (H) over bar (+), in s-wave collisions, are calculated. It is found that the reactions originating from Ps (1s/2s) + H produce (H) over bar (+) with a constant cross section within 0.05 eV above the threshold while the reaction cross section from Ps (3s) decreases as the collision energy increases in the same energy interval. Just above the threshold, the cross section of (H) over bar (+) production from Ps (3s) + (H) over bar in s-wave collision is 7.8 times larger than that from Ps (1 s) + (H) over bar in s-wave and 2.3 times larger than that from Ps (2s) + (H) over bar in s-wave. The near-threshold de-excitation reaction from Ps (3s) + (H) over bar occurs more rapidly than the (H) over bar (+) production.
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