Temat: discontinuity - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Scattering of Sound Waves in Two Stepped Non-uniformly Lined Duct
Autorzy:: Tiryakioglu, Ayse
Demir, Ahmet
Tematy:: Wiener-Hopf
scattering matrices
step discontinuity
impedance discontinuity
duct; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/177113.pdf Link otwiera się w nowym oknie
Opis:: Scattering of sound waves in two stepped cylindrical duct which walls are coated with different acoustically absorbent materials is investigated by using Wiener-Hopf technique directly and by determining scattering matrices. First, by using Fourier transform technique we obtain a couple of modified Wiener-Hopf equations whose solutions involve four sets of infinitely many unknown expansion coefficients providing systems of linear algebraic equations. Then we determine scattering matrices of the problem and we state the total transmitted field by using generalized scattering matrix method. Numerical results are compared for different parameters.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 2.

Tytuł:: Evaluation of Micromachining Processes Using Data in the Format and Geometric Characteristics of Micro-Chips
Autorzy:: Kacalak, W.
Tandecka, K.
Rypina, Ł.
Tematy:: microfinishing
microchip
discontinuity; Pokaż więcej
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Powiązania:: https://bibliotekanauki.pl/articles/99434.pdf Link otwiera się w nowym oknie
Opis:: Studies on micro-chips formed in the process of micromachining, including grinding and microfinishing using abrasive films, were conducted. Geometric characteristics of the micro-chips were analyzed and the presence of very long chips compared to their width was observed. One also reported the presence of very high temperatures in the treatment zone despite the applied cooling, which resulted in the formation of spherical chips. The occurrence of two characteristic spherical chip structures was observed followed by evaluation of their chemical composition. Based on the tabular structure of band chips, characteristic micro-discontinuities in the microcutting process were determined.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 3.

Tytuł:: Introduction
Autorzy:: Sujecka, Jolanta
Tematy:: Macedonia
Balkans
continuity
discontinuity; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Slawistyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/508942.pdf Link otwiera się w nowym oknie
Opis:: IntroductionThe text presents the leading subject of the issue, and discusses the question of cultural dis-contiuity, with special interest to its Balkan context.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Changes in spatial discontinuity in settlement patterns in the Czech-Polish border area : a case study of Těšín Silesia
Autorzy:: Ostafin, Krzysztof
Kaim, Dominik
Burian, Jaroslav
Pavlačka, Daniel
Opis:: The paper presents a discontinuity-based analysis of the settlement pattern changes in the Czechia–Poland cross-border historical region of Těšín Silesia. An approach based on a well-known and popular method (regression discontinuity design) was applied to measure spatial discontinuity. To describe the spatiotemporal changes, a combination of spatial, statistical and cartographic methods was used. The observed differences have been developing for more than 150 years; at the start, this area belonged to the territory of one state, and later it was divided by a national border. The division of the region resulted in areas following different development trajectories.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

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Skocz do pozycji: 5.

Tytuł:: The influence of litho- and pedogenic processes on Luvisols formation of selected area of Vistula Glaciation
Autorzy:: Jaworska, H.
Dąbkowska-Naskręt, H.
Kobierski, M.
Tematy:: luvisols
lithological discontinuity
lessivage
glacial sediments; Pokaż więcej
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/2060473.pdf Link otwiera się w nowym oknie
Opis:: The objective of the study was to determine the effect of litho- and pedogenic processes on soils of the selected area of Vistula Glaciation, based on profile distribution of unweathered components such as titanium, zirconium and silica in relation to their morphology, mineralogy, micromorphology and physicochemical properties. The predominant type of soilin the study area are Luvisols. Analysis of texture allowed to classify the investigated soils to sandy silts with loamy material as their subsoil. In the bulk soil silica dominates and its content was in the range 71.4 to 88.6%. The content of TiO2 within the profiles is fairy similar, without clear patterns in the profile distribution. The total content of zirconium in the samples was in range of 95.13 to 212.15 mg x kg-1. In the profile distribution of zirconium higher content of Zr was observed in the upper horizons compared to the top layerin all of theanalysed profiles, indicating different origin of soil material. Statistical analysis showed positive correla- tion between the total content of zirconium and the content of fraction 0 0.05-0.002 mm (correlation coefficient value: 0.692384; significance level - p < 0.05) and negative correlation between zirconium and clay content (correlation coefficient: -0.668157; p < 0.05). The lithologic discontinu i ty within profiles of the investigated soils has been additionally has proved by X-ray analysis of the clay fraction. The micromorphological analysis confirmed the complex genesis of the studied soils. The results of the study clearly showed an overall inhomogeneity and stratification of the soils. Studied Luvisols did not form as weath- ering product of homogeneous bedrock. Changes in granulometric and chemlcal composition within soil profiles are the consequence of translocation of clay fraction during lessivage as well as lithologic discontinul ty of the solum.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 6.

Tytuł:: Arithmology and monadology of Nikolai Bugaev
Autorzy:: Drozdek, Adam
Tematy:: arithmology
monadology
continuity
discontinuity
Leibniz
Solovyov; Pokaż więcej
Wydawca:: Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Powiązania:: https://bibliotekanauki.pl/articles/2142668.pdf Link otwiera się w nowym oknie
Opis:: Nikolai Bugaev was a mathematician keenly interested in philosophy. He stressed the role of discontinuity in his mathematical research that he called arithmology. He also emphasized the importance of discontinuity in nature which he embodied in his version of monadology. The article discusses the viability of his philosophical investigations.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Nieciągłości geometryczne obrabianych elementów a cechy struktury geometrycznej powierzchni
Geometric discontinuities of workpieces and the features of geometric structure of surface
Autorzy:: Słomion, Małgorzata
Wojciechowski, Andrzej
Matuszewski, Maciej
Polishchuk, Oleg
Tematy:: geometric discontinuity
machining
surface geometric structure
roughness; Pokaż więcej
Wydawca:: Wydawnictwo AWART
Powiązania:: https://bibliotekanauki.pl/articles/404434.pdf Link otwiera się w nowym oknie
Opis:: The surface geometric structure largely determine the functional characteristics of machine elements and their tribological characteristics. In this paper the influence of geometric discontinuities, such as holes and grooves on the features of surface geometric structure were presented. This impact was assessed on the basis of surface roughness measurements. The conducted experimental verification showed the influence of geometric discontinuities on the features of geometric structure of machined surface.
Struktura geometryczna powierzchni w dużym stopniu determinuje cechy użytkowe elementów maszyn i ich charakterystyki tribologiczne. W artykule przedstawiono wpływ nieciągłości geometrycznych typu otwór oraz rowek na cechy struktury geometrycznej powierzchni. Ocenę tego wpływu dokonano w oparciu o pomiary chropowatości powierzchni. Przeprowadzona weryfikacja doświadczalna wykazała wpływ nieciągłości geometrycznych na parametry opisujące strukturę geometryczną powierzchni.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Waves in elastic materials and structures
Autorzy:: Wesołowski, Z.
Tematy:: wave propagation
discontinuity
reflection and propagation speed; Pokaż więcej
Wydawca:: Polskie Towarzystwo Akustyczne
Powiązania:: https://bibliotekanauki.pl/articles/332103.pdf Link otwiera się w nowym oknie
Opis:: The mathematical description of waves propagation in elastic materials and structures is presented. Particularly, the considerations concern the water as a transmission medium for acoustic waves. The following issues are discussed: discontinuity, reflection, and propagation speed, among others.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Stability analysis of jointed rock slopes using geomechanical, kinematical, and limit equilibrium methods: the Chouf Amar career, MSila, NE Algeria
Autorzy:: Farid, Zahri
Riheb, Hadji
Karim, Zighmi
Younes, Guesmi
Rania, Boudjellal
Aniss, Mahleb
Tematy:: discontinuity
slope stability
limestone quarry
RMR
FEM; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Powiązania:: https://bibliotekanauki.pl/articles/89073.pdf Link otwiera się w nowym oknie
Opis:: Many open-cast mines in Algeria are regularly affected by instabilities that disrupt the exploitation activity, such as Chouf Amar's career where recurrent failures are caused by the combined action of a number of predisposition and triggering factors. I this study we uses a commbined-Geomechanical, Kinematical, numerical and limit equilibrium analysis to evaluate the behaviour of the discontinuous rock masses in open pit mine, and we chooses the Chouf Amar career as a case study. We determines nine main sets of discontinuities in the three main facies of the stone-pit. We proved also that the quarry suffers from various types of failures and that blasting declines the values of safety factor. We find out the causes of the 2009 slip-incident. By this combined approaches we have made it possible to optimize operations and to improve career productivity while ensuring the safety of equipment and personnel.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 10.

Tytuł:: The Impact of Covid-19 on selected Hungarian industries – close observation
Autorzy:: Msomi, Wiseman
Nxumalo, Brenda
Mabeba, Mahlatse
Wydawca:: WSB in Poznań University Press
Cytata wydawnicza:: Nxumalo,B., Msomi, W., & Mabeba, M. (2022) The Impact of COVID-19 on Selected Hungarian Industries — Close Observation. In W.Nowiński, K. Starzyk, & J. Rymarczyk (Eds.), Covid-19: Implications for the economy. (pp. 95-111), WSB in Poznań University Press.
Opis:: On 11 March 2020 the World Health Organization declared COVID-19 as a pandemic. Countries around the world adopted risk-mitigating measures such as lockdown, quarantine, and curfew. Lockdown is an uncommon risk-mitigating measure applied to prevent the spread of the pandemic. There have been diverse views on its effects on the economy. However, it is indisputable that the COVID-19 pandemic imposed an additional burden on industries in the economies of individual countries. The main aim of the study was to assess the impact of the COVID-19 pandemic on selected industries in Hungary. Regression discontinuity design (RDD) was applied to determine the partial impact of the COVID-19 pandemic on selected industries and investigate the effects of COVID-19 around its thresholds at a significant time and stage of the pandemic. The study revealed that COVID-19 negatively affected at least the industrial production of motor vehicles and non-durable goods. The industrial production of durable goods, raw steel, as well as total manufacturing were resilient to the COVID-19 pandemic.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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