Multidecadal (1960–2011) shoreline changes in Isbjørnhamna (Hornsund, Svalbard)

A section of a gravel-dominated coast in Isbjørnhamna (Hornsund, Svalbard) was analysed to calculate the rate of shoreline changes and explain processes controlling coastal zone development over last 50 years. Between 1960 and 2011, coastal landscape of Isbjørnhamna experienced a significant shift from dominated by influence of tide-water glacier and protected by prolonged sea-ice conditions towards storm-affected and rapidly changing coast. Information derived from analyses of aerial images and geomorphological mapping shows that the Isbjørnhamna coastal zone is dominated by coastal erosion resulting in a shore area reduction of more than 31,600 m2. With ~3,500 m2 of local aggradation, the general balance of changes in the study area of the shore is negative, and amounts to a loss of more than 28,000 m2. Mean shoreline change is −13.1 m (−0.26 m a−1). Erosional processes threaten the Polish Polar Station infrastructure and may damage of one of the storage buildings in nearby future

MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF CAST NiAl ALLOYS WITH THE ADDITION OF Ti

Results of compression and corrosion resistance tests of NiAl alloys with 1.0 and 2.0 wt.% of titanium are described. The compression tests conducted in a wide range of temperature and strain rate showed that increase of titanium content causes increase of brittleness at room temperature, while at higher temperatures an increase of hardness and strength is observed. The analysis of electrochemical corrosion resistance showed that the alloys containing Ti are characterized by considerable resistance to sulfuric acid VI, because the emerging titanium oxide prevents active solubilizing of the alloy. Besides, microstructure observations performed at various levels of deformation which allowed to identify mechanisms responsible for fracture of the studied alloys

Study of the B−→Λc+Λˉc−K−B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} decay

The decay $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ is studied in proton-proton collisions at a center-of-mass energy of $\sqrt{s}=13$ TeV using data corresponding to an integrated luminosity of 5 $\mathrm{fb}^{-1}$ collected by the LHCb experiment. In the $\Lambda_{c}^+ K^{-}$ system, the $\Xi_{c}(2930)^{0}$ state observed at the BaBar and Belle experiments is resolved into two narrower states, $\Xi_{c}(2923)^{0}$ and $\Xi_{c}(2939)^{0}$, whose masses and widths are measured to be $$m(\Xi_{c}(2923)^{0}) = 2924.5 \pm 0.4 \pm 1.1 \,\mathrm{MeV}, \\ m(\Xi_{c}(2939)^{0}) = 2938.5 \pm 0.9 \pm 2.3 \,\mathrm{MeV}, \\ \Gamma(\Xi_{c}(2923)^{0}) = \phantom{000}4.8 \pm 0.9 \pm 1.5 \,\mathrm{MeV},\\ \Gamma(\Xi_{c}(2939)^{0}) = \phantom{00}11.0 \pm 1.9 \pm 7.5 \,\mathrm{MeV},$$ where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt $\Lambda_{c}^{+} K^{-}$ sample. Evidence of a new $\Xi_{c}(2880)^{0}$ state is found with a local significance of $3.8\,\sigma$, whose mass and width are measured to be $2881.8 \pm 3.1 \pm 8.5\,\mathrm{MeV}$ and $12.4 \pm 5.3 \pm 5.8 \,\mathrm{MeV}$, respectively. In addition, evidence of a new decay mode $\Xi_{c}(2790)^{0} \to \Lambda_{c}^{+} K^{-}$ is found with a significance of $3.7\,\sigma$. The relative branching fraction of $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ with respect to the $B^{-} \to D^{+} D^{-} K^{-}$ decay is measured to be $2.36 \pm 0.11 \pm 0.22 \pm 0.25$, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb public pages

Measurement of the ratios of branching fractions R(D∗)\mathcal{R}(D^{*}) and R(D0)\mathcal{R}(D^{0})

The ratios of branching fractions $\mathcal{R}(D^{*})\equiv\mathcal{B}(\bar{B}\to D^{*}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(\bar{B}\to D^{*}\mu^{-}\bar{\nu}_{\mu})$ and $\mathcal{R}(D^{0})\equiv\mathcal{B}(B^{-}\to D^{0}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(B^{-}\to D^{0}\mu^{-}\bar{\nu}_{\mu})$ are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb${ }^{-1}$ of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode $\tau^{-}\to\mu^{-}\nu_{\tau}\bar{\nu}_{\mu}$. The measured values are $\mathcal{R}(D^{*})=0.281\pm0.018\pm0.024$ and $\mathcal{R}(D^{0})=0.441\pm0.060\pm0.066$, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is $\rho=-0.43$. Results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the Standard Model.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-039.html (LHCb public pages

Określenie wpływu dodatku manganu i krzemu na warunki odkształcania superplastycznego mosiądzów [alfa]+[beta] : praca doktorska /

Recenzenci pracy: Borys Mikułowski, Jarosław Mizera.Praca doktorska. Akademia Górniczo-Hutnicza im. Stanisława Staszica (Kraków), 2009.Bibliogr. k. 105-110.Układ równowagi Cu-Zn, mosiądze, przemiana martenzytyczna w mosiądzach α+β, układ równowagi Cu-Zn-Si, Cu-Zn-Mn, deformacja nadplastyczna, mechanizm odkształcenia nadplastycznego, w mosiądzach, wpływ dodatków stopowych na odkształcenie nadplastyczne mosiądzów, obróbka rozdrabniająca ziarno, deformacja nadplastyczna za pomocą ciśnienia gazu, metodyka, wyniki badań mikrostruktury stopów metodą mikroskopii świetlnej, badań strukturalnych metodą transmisyjnej mikroskopii elektronowej po procesie rozdrabniania ziarna, procesu odkształcenia nadplastycznego w próbie rozciągania, po odkształceniu nadplastycznym, badanie rozkładu orientacji ziaren za pomocą metody pomiaru indywidualnych orientacji, badania OIM mosiądzów z dodatkiem krzemu, manganu, próby tłoczenia za pomocą ciśnienia gazu, rozmiar kawitacja przy deformacji nadplastyczne

New psychoactive substances: problem and response.

The last decade of the 20th century saw a decrease in the prevalence of illicit substance use. The results of the IPiN study (ESPAD) and the CBOS Foundation (Youth) revealed lower drug use prevalence rates in 2003-2007 and 2008. A substantial improvement in the epidemiological area as well as health and security of both problem and occasional drug users was recorded in the Polish drug policy. However, these positive trends have been challenged in recent years by new developments, of which the most visible one has become the trade in new psychoactive substances (NPS), commonly known in Poland as ‘dopalacze’ (literally translated as afterburners) and ‘legal highs’ or ‘designer drugs’ in Western European literature, though these are not scientific terms. They started to be used colloquially and across the media to denote a whole range of substances or products with alleged or real psychoactive effects. These drugs might be of natural or synthetic origin and their distingushing feature is the fact that they are not listed as controlled substances according to either international or national laws

Application of thermal analysis to study composite materials

The results of corrosion studies of composite materials obtained by two state-of-the –art methods of powder metallurgy are presented in the article. The main goal of the studies was determination of high-temperature corrosion resistance of steel-matrix composites reinforced with 8 vol.% TiB2. Thermogravimetric analyses were conducted at 1100ºC in air in 24 h cycle. Microstructure of the composited after thermogravimetric studies was observed at scanning electron microscope

The Microstructure, Mechanical and Friction-Wear Properties of (TiBx/TiSiyCz)x3 Multilayer Deposited by PLD on Steel

The microstructure, mechanical properties, and friction-wear performance of (TiBx/TiSiyCz)x3 multilayer coatings deposited on the M2 steel by the pulsed laser deposition are investigated in detail in as-deposited state and after annealing at 500 °C for 5 min in air. Scanning and transmission electron microscopies are used to reveal microstructural changes caused by annealing. The influence of post-deposition annealing on hardness and Young modulus is studied in nanoindentation test. A scratch-test is applied to reveal changes in adhesion and the coefficient of friction (CoF) of coated samples with diamond before and after annealing. Friction-wear properties are also analyzed in dry sliding with Al2O3 and 100Cr6 steel in ball-on-disc tests. Our analysis shows that the post-deposition annealing leads to partial devitrification of the TiBx layers, where nanocrystalline TiB2 phase is identified, while the TiSiyCz layers retain amorphous. Annealing significantly increases mechanical properties of coated samples and adhesion of the (TiBx/TiSiyCz)x3 multilayer to steel substrates. Friction-wear properties of coated samples are also notably improved. The values of CoF for coated samples tested with diamond (in the scratch-test), alumina, and 100Cr6 steel (ball-on-disc tests) are in the range of 0.05–0.23, while for M2 steel the CoF values are 0.8, 0.45, and 0.8, respectively