Technical Transactions. Vol. 11

Technical Transactions. Vol. 11

Type: Collection of magazine numbers
Release date

Collection items (21)


The design and the performance of stratospheric mission in the search for the Schumann resonances

Papaj, Arkadiusz, Weszka, Piotr, Bocheński, Marcin, Michałek, Mateusz, Karbowniczek, Paweł, Kycia, Radosław A., Kułak, Andrzej, Kołodziejczyk, Agata, Harasymczuk, Matt, Ławrynowicz, Aleksandra, Kuźma, Joanna, Brol, Tomasz
Article
2017
The technical details of a balloon stratospheric mission that is aimed at measuring the Schumann resonances are described. The gondola is designed specifically for the measuring of faint effects of ELF (Extremely Low Frequency electromagnetic waves) phenomena. The prototype met the design requirements. The ELF measuring system worked properly for entire mission; however, the level of signal amplification that was chosen taking into account ground-level measurements was too high. Movement of the gondola in the Earth magnetic field induced the signal in the antenna that saturated the measuring system. This effect will be taken into account in the planning of future missions. A large telemetry dataset was gathered during the experiment and is currently under processing. The payload consists also of biological material as well as electronic equipment that was tested under extreme conditions.

Method of programming the nitinol springs in the space of the kiln chamber

Wieczorek, Bartosz, Kukla, Mateusz, Wojtkowiak, Dominik, Okoniewicz, Piotr, Ostrowska, Karolina
Article
2017
This paper shows a method of programming the NiTinol springs by heating them up in the furnace chamber filled with technical nitrogen. A fully specified methodology, which consists of preparing the spring forms, the numerical analysis of the heating time and the description of the heating process are presented in this article. The effectiveness of the following method is confirmed using research of shape retention after a series of duty cycles performed by an activated NiTinol spring.

A slope stability analysis of an open-pit mine to evaluate its suitability as a site for the intersection of the S-7 and S-52 expressways

Szwarkowski, Dariusz, Zięba, Jakub
Article
2017
This paper presents a comprehensive approach to the numerical modelling of the geotechnical issues related to the stability of the slopes of a former open-pit mine. The mine is located within short distance of the planned S-7 expressway route and the northern bypass of Krakow; therefore, there is a need of opinion as the project might have a significant impact on the surrounding area including structures planned nearby, as well as stability of slopes of former open-pit mine. The finite element method (FEM) was applied to the numerical analysis with the specific aim of assessing the risk of the movement of soil mass as far as the slopes of the Zesławice open-pit mine are concerned [4]. Field work and numerical analysis were conducted in reference to land reclamation plans of former Miocene clay mine located in the Carpathian Foredeep. The numerical modelling includes zoning plans. The numerical modelling was conducted with a terrestrial laser scanner application [12]. In addition, spatial distribution and the identification of the parameters of the subsoil layers was performed. A numerical soil model, based on Mohr–Coulomb theory, was also taken into consideration. shear reduction method (SRM) was applied to determine the slope stability; the areas at risk of mass movement were then identified on the basis of the slope stability ratio.

Comparative analysis of the experimental and numerical research of the stamping process of axially-symmetrical elements

Różyło, Patryk, Wójcik, Łukasz
Article
2017
The paper presents experimental and numerical results of the stamping process of an axially-symmetrical element. The subject of the study was a sample made of a 0.47 mm thick aluminium alloy Al-1100 sheet. Experimental studies were conducted on a universal testing machine, while numerical simulations were carried out on two different numerical software programs Abaqus® and Deform-3D. The results obtained from the numerical analysis allowed to develop a numerical model of the stamping process.

Production and properties of electro-spark deposited coatings modified via LBM

Radek, Norbert, Pietraszek, Jacek, Szczotok, Agnieszka, Bronček, Jozef
Article
2017
The paper is concerned with determining the influence of laser treatment process on the properties of electro spark coatings. The properties were assessed after a laser treatment by analysing microstructure and X-ray diffraction and measuring surface geometric structure and microhardness. The studies were conducted using WC-Cu electrodes produced by powder metallurgy of nanostructural powders. The coatings were deposited by means of the EIL-8A model and they were laser-treated with the Nd:YAG, BLS 720 model.

Experiments with language combinatorics in text classification: lessons learned and future implications

Ptaszynski, Michał, Masui, Fumito
Article
2017
This paper presents a meta-analysis of experiments performed with language combinatorics (LC), a novel language model generation and feature extraction method based on combinatorial manipulations of sentence elements (e.g., words). Along recent years LC has been applied to a number of text classification tasks, such as affect analysis, cyberbullying detection or future reference extraction. We summarize two of the most extensive experiments and discuss general implications for future implementations of combinatorial language model.

The influence of changing the road pavement and the method of using a wheelchair on the vibration perception in accordance with ISO 2631

Dziechciowski, Zygmunt, Kromka-Szydek, Magdalena, Chwalik, Gabriela
Article
2017
The aim of the study is to research the influence of pavement types and the position of wheelchair a user on driving comfort. The tests have been done for six different pavements and positions of the wheelchair user, as passive and as active. The assessment has been done on the basis of vibration measurements on the seat of a wheelchair for three perpendicular directions. The obtained characteristics for the selected frequency band have been compared to the criteria curves by ISO 2631. In the next stage of the study, the multiplicity of the exceedances of the vibration perception threshold and the vibration comfort have been calculated. The values of the multiplicity of exceedances have been used in the carried-out assessment process.

Lower and upper bounds for solutions of the congruence xm ≡ a(mod n)

Zakarczemny, Maciej
Article
2017
Let n, m be natural numbers with n ≥ 2. We say that an integer a, (a, n) = 1, is the m-th power residue modulo n if there exists an integer x such that xm ≡ a(mod n). Let C(n) denote the multiplicative group consisting of the residues modulo n which are relatively prime to n. Let s(n, m, a) be the smallest solution of the congruence xm ≡ a(mod n) in the set C(n). Let t(n, m, a) be the largest solution of the congruence xm ≡ a(mod n) in the set C(n). We will give an upper bound for s(n, m, a) and a lower bound for t(n, m, a).

The flattening phenomenon in a seasonal variability analysis of the total nitrogen loads in river waters

Wilk, Paweł, Orlińska-Woźniak, Paulina, Gębala, Joanna, Ostojski, Mieczysław
Article
2017
This article shows the results of analyses conducted of the seasonal variability of nitrogen concentrations and loads, depending on plants growing season, this doesn’t seem to work, consider changing to something like ‘dependent upon the stage of the plant growing season,’ if that is what you mean as well as river flow and the precipitation levels in the basins of Middle Warta, Reda and Rega. The Macromodel DNS/SWAT, implemented for three basins, has been calibrated in calculations profiles of three river basins this is vague and unclear, the repetition of ‘three (river) basins’ is particularly confusing. The analysis confirmed the significant impact of cover crops on the retention of water and nutrients. The phenomenon of periodic decreases and stabilisation of nitrogen concentrations and loads in the surface waters flowing through the profiles of the enclosing water body was observed and analysed. The flattening phenomenon analysis of the phenomenon to me, the repetition of ‘phenomenon’ is confusing, you could clarify this by defining the second use of ‘phenomenon’ by, for example, inserting ‘of these decreases and stabilisation’ here can be used to assess the state of the ecosystem in the basin area.

Sources of endocrine-disrupting compounds and their migration to the environment

Kryłów, Małgorzata, Rezka, Piotr
Article
2017
The aim of this article is to present issues related to the presence and pathways of bisphenol A emission and its migration to wastewater and the environment. Bisphenol A (BPA) is an organic compound mainly used in the production of plastics. It is classified as an endocrine disrupting compound (EDC) and should therefore not be emitted to the environment. This paper presents basic information on bisphenol A, its applications and potential sources of emission to the environment. A wide review of literature confirming the occurrence of bisphenol A in sewage, sediments, natural waters, drinking water and the atmosphere is performed. Effective wastewater treatment and neutralisation of bisphenol A in sewage sludge could partially reduce the levels of BPA pollution in the aquatic environment.