Łódź University of Technology (Polish: Politechnika Łódzka) was created in 1945 and has developed into one of the biggest technical universities in Poland. Originally located in an old factory building, today covering nearly 200,000 sq. meters in over 70 separate buildings, the majority of them situated in the main University area. Almost 15,000 students are currently studying at the University. The educational and scientific tasks of the University are carried out by about 3,000 staff members..
Two stable benzo[e][1,2,4]triazinyl radicals fused with a fluorescent carbazole-based helicene were obtained by photocyclization and investigated by spectroscopic, electrochemical and DFT methods. The racemates were resolved and ECD spectra were analyzed.
High refractive index (4.4 at 1100 nm), negligibly small absorption in the near-infrared spectral range, and ease of processing make MoSe2 the perfect material for applications in near-infrared photonics. So far, implementation of MoSe2-based photonic structures has been hindered by the lack of large-surface MoSe2 substrates. The use of molecular beam epitaxy allows the production of homogeneous layers of MoSe2 with a few-inch surface and a thickness controlled at the sub-nm level. In the present work, we design by theoretical calculations and fabricate by a simple lithography process an ultrathin subwavelength grating out of a 42 nm thick, epitaxially grown MoSe2 layer. Our polarization-resolved reflectivity measurements confirm that the gratings host a peculiar type of a confined optical mode that is a bound state in the continuum. Moreover, the fabricated structures enhance the efficiency of the third-harmonic generation by over 3 orders of magnitude as compared to the unstructured MoSe2 layer. The presented results are promising for the realization of flat, ultracompact devices for lasing, wavefront control, and higher-order topological states of the light.
The subject of consideration is a medium that is periodically layered along its thickness, H, in the direction of the x3 axis, resting on an undeformable base. It consists of many repeating thin layers of thickness h (small compared to H). Each layer is made up of an even number of 'sublayers'. In the medium under consideration, it is possible to identify a small repeating element, known as the periodicity cell. In order to account for the influence of the size of this element (the so-called microstructure size effect) in the analysis of the dynamic behaviour of a periodically layered medium, the tolerance modelling method is applied. The derived equations have constant coefficients and take into account the microstructure size effect mainly in dynamic problems of a periodically layered medium. This effect is demonstrated using the example of wave propagation along the x1 axis, parallel to the layers, with a displacement component along the x3 axis, i.e., perpendicular to the layers. Formulas determining the wave propagation speeds in the medium under consideration are derived, and the influence of various parameters related to the medium's structure is analysed. Furthermore, in the range of lower wave propagation speeds, the results are confirmed using the well-known asymptotic model.
Copper-(II) coordination compounds are prospective building blocks of magnetic materials for future technologies and biologically active compounds. Their magnetic properties are greatly influenced by coordinating ligands, counterions, cocrystallization partners, and crystal arrangements. The self-organization of crystal structures containing [Cu-(Arg)-(B)]2+ cationic complexes is largely determined by the type of counteranions. Using NO3 - ions resulted in the formation of a new copper-(II) l-arginato 1D polymeric complex, with the following formula: {[Cu-(l-Arg)-(phen)-(μ-NO3)]-(NO3)·H2O}n. The results demonstrate the importance of interactions between NO3 - and the [Cu-(l-Arg)-(phen)]2+ coordination units in constructing the unit cell, stabilizing the structure and the spectroscopic and magnetic properties. The [Cu-(l-Arg)-(phen)]2+ cations are linked by NO3 - axial-axial bridges with Cu···Cu distance of 7.071 Å, which induced weak antiferromagnetic interactions between copper-(II) ions with S = 1/2. The O···H intermolecular interactions mostly control the molecular packing. The EPR (g ⊥ = 2.056, g || = 2.230) and vis (16970 cm-1) parameters confirm the elongated octahedral geometry (T = 0.76) and SOMO oriented in the xy plane N3O coordination sphere. Solid-state 13C NMR spectroscopy is used to characterize the distribution of spin density in organic ligands, with relativistic two-component (SO-ZORA) DFT calculations used to interpret experimental 13C NMR data. Our current N3O coordination polymer belongs to an interesting class of weakly coupled antiferromagnetic compounds.
This paper analyzes the influence of the heat source size on circuit temperature distribution. Thermal simulations are carried out using the analytical Green's function method. The circuit thermal model used here assumes that the heat transfer coefficient values are temperature dependent. The statistical data concerning maximal, minimal and average temperature and heat transfer coefficient values as well as their standard deviation are discussed in detail providing some important conclusions.
