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- Engström, Hans
(författare)
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Laser welding catalytic converters : a complete success for AP Torsmaskiner AB, Sweden
- 1999
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Ingår i: Svetsaren. - 0039-7083. ; 54:1-2, s. 26-28
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- AP Torsmaskiner AB (Smaland, Sweden) is using an LMI laser welding machine equipped with a Trumpf 6 kW CO2 turbolaser and a helium shielding gas for welding car catalytic converters. The LMI system has three axes with two welding stations, with the laser being switched between stations via a moving indexing mirror. The silencer/catalytic converter is produced from W-1.4512 ferritic stainless steel using lap joints. Commissioning problems, including porosity due to dry oil from pressing steel plates, are discussed. Potential system design improvements are mentioned.
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- Engström, Hans
(författare)
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"Racer" : a new laser and water jet R&D programme in Sweden
- 1999
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Ingår i: 7th NOLAMP Conference. - Lappeenranta : Lappeenrannan teknillinen korkeakoulu. - 9517643500 ; , s. 48-50
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Konferensbidrag (refereegranskat)abstract
- A new research and development programme, called Racer, for the promotion of laser and water jet technologies in mechanical engineering industries in Sweden is described. The programme is financed mainly by NUTEK, the Swedish National Board for Technical and Industrial Development. The programme is supported by more than 20 Swedish companies with Lulea University of Technology acting as programme manager. The sub-projects are: development of laser welding techniques for components of thick engineering materials; automation and laser welding by industrial robots; development of process technology and production equipment for laser surface treatment; laser surface hardening by Nd:YAG and diode lasers; and the development of alternative process technology for abrasive water jet cutting.
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| 6. |
- Engström, Maria, et al.
(författare)
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Hartree-Fock linear response calculations of g-tensors of substituted benzene radicals
- 1999
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Ingår i: Chemical Physics. - : Elsevier. - 0301-0104 .- 1873-4421. ; 243:3, s. 263-271
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Tidskriftsartikel (refereegranskat)abstract
- Linear response theory has been applied for calculations of g-tensors of organic radicals in order to test the range of validity of restricted Hartree-Fock reference states. The g-values were calculated for the benzene cation (C6H6+), the benzene anion (C6H6-), hydropyrazine (C4H5N2), the dihydropyrazine cation (C4H6N2+), the aniline radical (C6H5NH), the p-benzoquinone anion (C6H4O2-), phenoxyl (C6H5O), the nitrobenzene anion (C6H5NO2-), and the nitropyridine anion (C5H4N2O2-). Influence of variations of structural parameters on the g-tensor components were investigated. Calculated g-values were in excellent agreement with experiment for six out of nine radicals. Two radicals - the p-benzoquinone anion and aniline radical - showed minor discrepancies, while the g-tensor of the phenoxyl radical was incorrect. The problem with the phenoxyl radical was traced to a complex electronic structure and optical spectrum. Results consistent with experiment could in that case only be obtained with electron correlated calculations.
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| 7. |
- Engström, Maria, et al.
(författare)
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Linear response calculations of electronic g-factors and spin-rotational coupling constants for diatomic molecules with a triplet ground state
- 1998
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Ingår i: Chemical Physics. - : Elsevier. - 0301-0104 .- 1873-4421. ; 237:1-2, s. 149-158
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Tidskriftsartikel (refereegranskat)abstract
- Electronic g-factors for ESR spectra of a number of diatomic molecules with a ground X3Σ- state and their electronic spin-rotational coupling constants have been calculated by a linear response method. General expressions are used for the second order correction to the electronic g-factor which account for spin-orbit coupling induced admixtures from all excited triplet states to the ground state orbital magnetism. First order corrections - the spin-Zeeman kinetic energy contribution and the one-electron spin-Zeeman gauge contribution - to the g-factor are also accounted for. Calculated g-factors and spin-rotational coupling constants are in a good agreement with available experimental data. In particular, the positive, anomalous, sign of the spin-rotational coupling constant of the PF radical is reproduced.
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