Wyznaczanie nośności siatek okładzinowych zgrzewanych

W 2018 r. wprowadzono do stosowania normę PN-G-15050:2018-01 „Obudowa wyrobisk górniczych. Siatki okładzinowe zgrzewane”, która zastąpiła normę, o takim samym tytule, z 1996 r. Jedna z istotnych, wprowadzonych zmian dotyczy sposobu wyznaczania nośności siatki. W publikacji przedstawiono sposób wyznaczania wartości równoważnika Mg nośności siatek typu O i typu S oraz nośności siatki typu K. Wyniki obliczeń porównano z wartością momentu zginającego wyznaczonego zgodnie z dotychczasową normą. Zinterpretowano wymagania zawarte w nowej normie

MOCVD Grown HgCdTe Heterostructures

HgCdTe heterostructures are widely applied for IR (infrared) detector constructing. Donor‐ and acceptor‐doping researches in (100) and (111) oriented HgCdTe layers grown by MOCVD have been studied. Fully doped HgCdTe heterostructures with acceptor concentration range between 1014 and 5 × 1017 cm-3 and donor concentration range between 1014 and 1 × 1018 cm-3 and without post‐grown annealing have been reported. The electrical and chemical characterizations of HgCdTe structures grown at 360°C on GaAs substrates using DIPTe have been described. Infrared photodiodes with different composition x were constructing on the basis of obtained heterostructures enabling signal detection of any wavelength from 1 µm to above 20 µm covering SWIR, MWIR and LWIR spectral ranges. Presented experimental results show that MOCVD technology enables to grow HgCdTe structures dedicated for HOT devices

Interplay between the static ordering and dynamical heterogeneities determining the dynamics of rotation and ordinary liquid phases in 1,6-anhydro-β-D-glucose

In this letter, we reported thorough the structural and molecular dynamics studies on 1,6-Anhydro-β-D-glucose, the second compound reported so far that is capable to form rotator and supercooled liquid phases. In contrast to the data presented for ethanol, temperature dependences of structural dynamics in both phases are very comparable. On the other hand, X ray measurements revealed unusually long range ordering/correlations between molecules in the ODIC (d â ‰ 95 Å) and supercooled phases (d â ‰ 30-40 Å) of this carbohydrate. Our consideration clearly demonstrated that the interplay between length scales of static range ordering and dynamical heterogeneities as well as internal molecular arrangement seem to be the key to understanding the molecular dynamics of different materials characterized by varying degree of disorder in the vicinity of the glass transition temperature

Wstępne, jednoośrodkowe doświadczenia zabiegów przezskórnej angioplastyki restenozy w stentach oraz niedoprężonych stentów implantowanych do tętnic wieńcowych z wykorzystaniem aterektomii laserowej (ELCA)

Preliminary results of the treatment of 14 patients with laser aterectomy have been presented in this paper. The main indications for coronary laser aterectomy were: long, critical in stent restenotic lesions, undeployed stents or chronic total occlusions of the coronary arteries. One patient had a subacute in stent thrombosis 5 days after drug eluting stent implantation and in 6-month follow-up another patient had in stent restenosis.W artykule przedstawiono wstępne wyniki leczenia 14 pacjentów z użyciem aterektomii laserowej. Głównymi wskazaniami do zabiegu wieńcowej aterektomii laserowej były długie, krytyczne nawroty zwężenia w stentach, niedoprężone stenty lub przewlekłe okluzje tętnic wieńcowych. U jednego pacjenta wystąpiła podostra zakrzepica w stencie powlekanym cytostatykiem w 5. dobie, a w obserwacji 6-miesięcznej u kolejnego pacjenta doszło do nawrotu zwężenia

The kinetics of mutarotation in L-fucose as monitored by dielectric and infrared spectroscopy

Fourier Transform Infrared Spectroscopy and Broadband Dielectric Spectroscopy are combined to trace kinetics of mutarotation in L-fucose. After quenching molten samples down to temperatures between T=313 K and 328 K, the concentrations of two anomeric species change according to a simple exponential time dependence, as seen by an increase in absorbance of specific IR-vibrations. In contrast, the dielectric spectra reveal a slowing down of the structural (α-) relaxation process according to a stretched exponential time dependence (stretching exponent of 1.5 ± 0.2). The rates of change in the IR absorption for α- and β-fucopyranose are (at T = 313 K) nearly one decade faster than that of the intermolecular interactions as measured by the shift of the α-relaxation. This reflects the fact that the α-relaxation monitors the equilibration at a mesoscopic length scale, resulting from fluctuations in the anomeric composition