@misc{NguyenBuhlBambach, author = {Nguyen, Lam and Buhl, Johannes and Bambach, Markus}, title = {Multi-bead Overlapping Models for Tool Path Generation in Wire-Arc Additive Manufacturing Processes}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.129}, pages = {1123 -- 1128}, language = {en} } @misc{NguyenBuhlIsraretal., author = {Nguyen, Lam and Buhl, Johannes and Israr, Rameez and Bambach, Markus}, title = {Analysis and compensation of shrinkage and distortion in wire-arc additive manufacturing of thin-walled curved hollow sections}, series = {Additive Manufacturing}, volume = {Vol. 47}, journal = {Additive Manufacturing}, issn = {2214-8604}, doi = {10.1016/j.addma.2021.102365}, language = {en} } @misc{NguyenBuhlBambach, author = {Nguyen, Lam and Buhl, Johannes and Bambach, Markus}, title = {Continuous Eulerian tool path strategies for wire-arc additive manufacturing of rib-web structures with machine-learning-based adaptive void filling}, series = {Additive Manufacturing}, volume = {Vol. 35}, journal = {Additive Manufacturing}, issn = {2214-8604}, doi = {10.1016/j.addma.2020.101265}, pages = {17}, language = {en} } @misc{NguyenBuhlBambach, author = {Nguyen, Lam and Buhl, Johannes and Bambach, Markus}, title = {Decomposition algorithm for tool path planning for wire-arc additive manufacturing}, series = {Journal of Machine Engineering}, volume = {18}, journal = {Journal of Machine Engineering}, number = {1}, issn = {1895-7595}, doi = {10.5604/01.3001.0010.8827}, pages = {96 -- 107}, language = {en} } @misc{MaiBuiNhungetal., author = {Mai, Tam V.-T. and Bui, Thanh Q. and Nhung, Nguyen Thi Ai and Quy, Phan Tu and Shrestha, Krishna Prasad and Mauß, Fabian and Giri, Binod Raj and Huynh, Lam Kim}, title = {An Ab Initio RRKM-Based Master Equation Study for Kinetics of OH-Initiated Oxidation of 2-Methyltetrahydrofuran and Its Implications in Kinetic Modeling}, series = {Energies}, volume = {16}, journal = {Energies}, number = {9}, issn = {1996-1073}, doi = {10.3390/en16093730}, abstract = {Cyclic ethers (CEs) can be promising future biofuel candidates. Most CEs possess physico-chemical and combustion indicators comparable to conventional fuels, making them suitable for internal combustion engines. This work computationally investigates the kinetic behaviors of hydrogen abstraction from 2-methyl tetrahydrofuran (2MTHF), one of the promising CEs, by hydroxyl radicals under combustion and atmospheric relevant conditions. The various reaction pathways were explored using the CCSD(T)/cc-pVTZ//M06-2X/aug-cc-pVTZ level of theory. The Rice-Ramsperger-Kassel-Marcus-based master equation (RRKM-ME) rate model, including treatments for hindered internal rotation and tunneling, was employed to describe time-dependent species profiles and pressure and temperature-dependent rate coefficients. Our kinetic model revealed that the H-abstraction proceeds via an addition-elimination mechanism forming reaction complexes at both the entrance and exit channels. Eight different reaction channels yielding five radical products were located. The reaction exhibited complex kinetics yielding a U-shaped Arrhenius behavior. An unusual occurrence of negative temperature dependence was observed at low temperatures, owing to the negative barrier height for the hydrogen abstraction reaction from the C-H bond at the vicinity of the O-atom. A shift in the reaction mechanism was observed with the dominance of the abstraction at Cα-H of 2MTHF ring (causing negative-T dependence) and at CH3 (positive-T dependence) at low and high temperatures, respectively. Interestingly, the pressure effect was observed at low temperatures, revealing the kinetic significance of the pre-reaction complex. Under atmospheric pressure, our theoretical rate coefficients showed excellent agreement with the available literature data. Our model nicely captured the negative temperature-dependent behaviors at low temperatures. Our predicted global rate coefficients can be expressed as k (T, 760 Torr) = 3.55 × 101 × T-4.72 × exp [-340.0 K/T] + 8.21 × 10-23 × T3.49 × exp [918.8 K/T] (cm3/molecule/s). Our work provides a detailed kinetic picture of the OH-initiated oxidation kinetics of 2MTHF. Hence, this information is useful for building a kinetic me chanism for methylated cyclic ethers.}, language = {en} }