Surface-confined 2D polymerization of a brominated copper-tetraphenylporphyrin on Au(111)

A coupling-limited approach for the Ullmann reaction-like on-surface synthesis of a two-dimensional covalent organic network starting from a halogenated metallo-porphyrin is demonstrated. Copper-octabromo-tetraphenylporphyrin molecules can diffuse and self-assemble when adsorbed on the inert Au(111) surface. Splitting-off of bromine atoms bonded at the macrocyclic core of the porphyrin starts at room temperature after the deposition and is monitored by X-ray photoelectron spectroscopy for different annealing steps. Direct coupling between the reactive carbon sites of the molecules is, however, hindered by the molecular shape. This leads initially to an ordered non-covalently interconnected supramolecular structure. Further heating to 300{\deg}C and an additional hydrogen dissociation step is required to link the molecular macrocycles via a phenyl group and form large ordered polymeric networks. This approach leads to a close-packed covalently bonded network of overall good quality. The structures are characterized using scanning tunneling microscopy. Different kinds of lattice defects and, furthermore, the impact of polymerization on the HOMO-LUMO gap are discussed. Density functional theory calculations corroborate the interpretations and give further insight into the adsorption of the debrominated molecule on the surface and the geometry and coupling reaction of the polymeric structure.Comment: 9 pages, 6 figure

Beyond dimension six in SM Effective Field Theory: a case study in Higgs pair production at NLO QCD

We present the NLO (two-loop) QCD corrections to Higgs boson pair production in gluon fusion within Standard Model Effective Theory (SMEFT), including also squared dimension-6 operators and double insertions of operators. The different options to truncate the EFT expansion are contrasted to a non-linear EFT approach (HEFT) and their effects are illustrated by several phenomenological examples

SMEFT predictions for gg → hh\textit{gg → hh} at full NLO QCD and truncation uncertainties

We present a calculation of the NLO QCD corrections for Higgs-boson pair production in gluon fusion including effects of anomalous couplings within Standard Model Effective Field Theory (SMEFT). We study effects of different truncation options of the EFT expansion in 1/Λ and of double operator insertions, both at total cross-section level as well as for the distribution of the invariant mass of the Higgs-boson pair, at $\sqrt{s}$ = 13 TeV. The NLO corrections are implemented in the generator ggHH_SMEFT in the Powheg-Box-V2 framework

Beyond dimension six in SM Effective Field Theory: a case study in Higgs pair production at NLO QCD

We present the NLO (two-loop) QCD corrections to Higgs boson pair production in gluon fusion within Standard Model Effective Theory (SMEFT), including also squared dimension-6 operators and double insertions of operators. The different options to truncate the EFT expansion are contrasted to a non-linear EFT approach (HEFT) and their effects are illustrated by several phenomenological examples

SMEFT predictions for gg→hhgg\to hh at full NLO QCD and truncation uncertainties

We present a calculation of the NLO QCD corrections for Higgs-boson pair production in gluon fusion including effects of anomalous couplings within Standard Model Effective Field Theory (SMEFT). We study effects of different truncation options of the EFT expansion in $1/\Lambda$ and of double operator insertions, both at total cross-section level as well as for the distribution of the invariant mass of the Higgs-boson pair, at $\sqrt{s}=13$ TeV. The NLO corrections are implemented in the generator \texttt{ggHH_SMEFT} in the $\texttt{Powheg-Box-V2}$ framework.Comment: 20 pages, 4 figures; v2: matches the published version; v3: cf. erratum/addendum, results with a fix for the two-loop virtuals (where the bug was affecting results with chhh/ct != 1, or ctt != 0

Loading of Agricultural Trailers using a Model-Based Method

There is a trend in agricultural engineering towards high-performance harvesting machines with growing operating width and throughput. As much as performance and throughput are rising, the transportation units, usually tractor-pulled trailers, are characterized by increasing transportation volume.If harvesting and transport are combined in parallel operation (e.g. self-propelled forage harvester), the driver of the harvesting machine as well as the driver of the transport unit has to pay a high degree of attention to the loading process. Losses of harvesting goods caused by missing the trailer have to be kept at a minimum. The complete transport volume should be utilized and collisions between the involved machines have to be avoided. Overloading processes with large-scaled machinery often imply that the visibility into the transportation unit is severely limited.   In a former project a forage harvester had been used as the prototype for developing a GPS-based position control of the spout. The main aim of this research project is to develop and analyse several model based loading strategies exemplified on a forage harvester and a corresponding transport unit. The model based loading means an enhancement of the automation of the loading process.First objective of this research project is the development of a software model of the heap of bulk goods during the overloading process. Basal analysis of heaps of agricultural goods like grass and maize silage are essential. By combining the software model, the space model of the transportation unit and the throughput, the current status of loading is predictable and different loading strategies can be spotted, tested and scrutinized with regard to efficiency and the facilitation of work