On behalf of Upper Silesian Division of the Polish Acoustical Society (main organizer) and Committee of Acoustics of the Polish Academy of Sciences (coorganizers) we are pleased to announce that according to many years of tradition the above-mentioned Conferences known as “Winter Schools” have been organized and carried out.
50th Jubilee Winter School on Wave and Quantum Acoustics constituted platforms for sharing the results and achievements obtained in different branches of physical acoustics (e.g. molecular acoustics, relaxation processes, quantum acoustics, acousto-optics, magnetoacoustics, photoacoustics, acoustics of solid state, acoustic emission etc.). Conference consisted of 17th Workshop on Acoustoelectronics and 17th Workshop on Molecular Acoustics, Relaxation and Calorimetric Methods.
XLVIXth Winter School on Environmental Acoustics and Vibroacoustics was the forum for all environmental and vibroacoustics fields. Particularly it concerned traffic noise, vibroacoustics of machines, room acoustics, building acoustics, noise protection and similar problems.
Celebrations of the “Golden Jubilee included:
• Jubilee Session with plenary lecture “The Golden Jubilee of the 50th Winter School on Wave and Quantum Acoustics – historical reminiscences” presented by prof. Tadeusz Pustelny and numerous touching addresses,
• Special Session “50 years have gone by ... – an evening of remembrance” conducted by prof. Marzena Dzida; it was a very nice session, without time restrictions as to presentations and discussions and the real duration of this session was twice as large as planned. Finally, 52 people participated within Conferences presenting 44 lectures, reports and posters. In this issue one can find abstracts of some lectures and posters, which were presented during the Conferences.
We are pleased to announce that on 27 February – 2/3 March, 2023, we will organize the next “Winter Schools” containing the Lth Jubilee Winter School on Environmental Acoustics and Vibroacoustics and 51st Winter School onWave and Quantum Acoustics. Thus, just now we invite you to participate in this “Golden Jubilee” Conference.
We would like to invite scientific centres and groups to cooperate in organizing workshops on the subjects of their interests related to the theme of the Conference. Further information about Conferences is available on our website https://ogpta.pl/index.php/en/

The development of the enteric nervous system (ENS) is still a valid and intensely studied issue. However, literature in the field has no data on this topic in the dog. The present investiga- tions were performed in three groups of fetuses from mongrel dogs – from the third, sixth- -seventh, and ninth week of pregnancy – and in 3-5-day-old puppies (3 specimens for each age group). The tissues (the medial parts of the duodenum, jejunum, and ileum with the cecum and a small portion of the adjacent ascending colon) were cut using a cryostat and the sections were processed for single- and double-labeling immunohistochemistry using antisera against acetylat- ed tubulin (AcTub), vesicular acetylcholine transporter (VAChT), nitric oxide synthase (NOS), vasoactive intestinal polypeptide (VIP), galanin (GAL), neuropeptide Y (NPY), substance P (SP), and calcitonin gene-related peptide (CGRP). In the 3-week-old fetuses, some oval cells invading the gut wall were found. From the seventh week of pregnancy onwards, two different enteric ganglia were present: submucosal and myenteric. The estimated number of nerve elements in the 9-week-old fetuses was much higher than that observed in the 6-7-week-old individuals. There was no significant difference in the estimated number of nerve structures between the 9-week-old fetuses and the 3-5-day-old puppies. The colonization pattern and the develop- ment of the ENS in the canine small intestine are very similar to those observed in other mam- mals. However, a few exceptions have been confirmed, regarding the time of appearance of the VIP-, GAL-, and CGRP-immunoreactive neurons, and their distribution in different portions of the canine bowel during development.

The main objective of this work is to present the results of numerical simulations of the landslide triggered by small excavation. In south-eastern Poland in 2019, during excavation for a gas pipeline (relatively small – maximal depth 2.7 m), a landslide was observed. Length of the landslide was about 80 m, width about 50 m, maximal depth 6.5 m. Excavation was partially buried. Observed cracks of the terrain surface were wide, up to 0.8 m. Stability of the landslide was analyzed using the proportional reduction of the soil strength parameters (c-fi reduction) algorithm with the use of ZSoil.PC Finite Element Method (FEM) system. Stability analysis of the slope before and after excavation was performed, together with analysis of the tendency of the landslide to propagate upwards. The obtained stability loss modes were compared with the results of the field observations and a good correlation was noticed. Hypothesis that a landslide was triggered by small excavation was proved (although reasonable margin of safety was obtained for state before excavation, stability factor SF = 1•60). Use of residual soil strength parameters (instead of peak ones) and activation of cut-off (no tension) condition are advised. Presented methodology is open and can be used in engineering practice.

At present, most of the existing target detection algorithms use the method of region proposal to search for the target in the image. The most effective regional proposal method usually requires thousands of target prediction areas to achieve high recall rate.This lowers the detection efficiency. Even though recent region proposal network approach have yielded good results by using hundreds of proposals, it still faces the challenge when applied to small objects and precise locations. This is mainly because these approaches use coarse feature. Therefore, we propose a new method for extracting more efficient global features and multi-scale features to provide target detection performance. Given that feature maps under continuous convolution lose the resolution required to detect small objects when obtaining deeper semantic information; hence, we use rolling convolution (RC) to maintain the high resolution of low-level feature maps to explore objects in greater detail, even if there is no structure dedicated to combining the features of multiple convolutional layers. Furthermore, we use a recurrent neural network of multiple gated recurrent units (GRUs) at the top of the convolutional layer to highlight useful global context locations for assisting in the detection of objects. Through experiments in the benchmark data set, our proposed method achieved 78.2% mAP in PASCAL VOC 2007 and 72.3% mAP in PASCAL VOC 2012 dataset. It has been verified through many experiments that this method has reached a more advanced level of detection.

The paper discusses the results of investigations of material, tribological and anti-corrosion properties of hybrid coatings of the Cr/CrN type, consisting of chromium and chromium nitride, formed on the surface of alloy tool steel by the Arc-PVD method. Investigations of the morphology and microstructure of hybrid coatings, as well as of their phase composition were carried out. The studies on mechanical properties included tests on hardness and Young’s modulus using the nanoindentation method. Tests on adhesion were conducted using the scratch-test method. Tribological properties of the obtained coatings were evaluated by the pin-on-disc method. Resistance to corrosion was determined by electrochemical methods. It was shown that hybrid coatings of the Cr/CrN type are characterized by good adhesion to the substrate and very good tribological properties, as well as by very good resistance to corrosion in a solution containing chlorine ions.