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The responding form. Part two
Get PDFThis essay is the second part of “The responding form 1. Short lecture on architecture” It is aimed at architecture students and all those who ask themselves what is the purpose for which architecture is built and what are the modes of architecture
Distinguished graduates in mathematics of Jagiellonian University in the interwar period. Part I: 1918‒1925
Get PDFIn this study, we present profiles of some distinguished graduates in mathematics of the Jagiellonian University from the years 1918‒1925. We discuss their professional paths and scholarly achievements, instances of scientific collaboration, connections with other academic centers in Poland and worldwide, involvement in mathematical education and teacher training, as well as their later roles in Polish scientific and academic life. We also try to understand in what way they were shaped by their studies and how much of Kraków scientific traditions they continued. We find strong support for the claim that there was a distinct, diverse and deep mathematical stream in Kraków between the wars, rooted in classical disciplines such as differential equations and geometry, but also open to new trends in mathematics
Dynamic and static eccentricity detection in induction motors in transient states
Get PDFThe following paper presents possibilities for the application of selected time-frequency analysis methods in the fault detection of cage induction machines in transient states. The starting phase current of the machine was chosen as a diagnostic signal. Selected faults were eccentricities – static and dynamic. In order to increase the selectivity of the obtained signal transformations, a notch filter was used to remove the base harmonic of the phase current. Two approaches of fault detection were compared. In the first approach, the characteristic feature of fault was extracted using DWT analysis. Next, TMCSA methodology was applied in which characteristic harmonics related to faults were shown on a time-frequency plane. In this case, applied methods were a Gabor transformation, STFT, CWT and Wigner–Ville’s transformation. In the analysis, a phase current signal approximated by DWT was used. DWT approximation was applied to filter higher harmonics which improves the resolution of the obtained transformations
Homo ludens and the nodes of urbanity. Places, maps, metaphors
Get PDFThe author discusses the interrelationships between play and the art of urbanism focusing on the cluster of nodal places called here “nodes of urbanity”. At the background of Huizinga’s theory of Homo ludens as cultural component, the analysis of these foci of urban life seem to have explanatory value for architectural and anthropological theories of the “Ludic City”. The main points of this conceptual framework are illustrated with two cases from the city of K rakow
Relationship between surface roughness and turbulence of natural winds near the ground surface
Get PDFThe design of low-rise buildings such that they can handle wind loads makes it necessary to accurately evaluate those wind loads, both on the structural framework and on the cladding/components. To this end, it is necessary to fully understand the characteristics of the wind near the ground around a building. This study sets out to develop a quantitative means of estimating the turbulence of the wind near the surface of the ground, based on field measurements obtained at different points across Japan. The surface roughness is evaluated based on several factors taken from a building information database. The relationship between these factors and the turbulence of the wind is discussed. The effect of the observation height, relative to the surface of the ground, on the turbulence is also investigated
Importance of sketches, graphics and computer in designing green walls
Get PDFGreen facades are becoming more and more frequently used tools in the process of urban transformation. They are treated by architects and town planners as a new material which allows them to transform grey and unattractive urban environment. Their final look, however, requires careful decisions and selecting adequate floral arrangements. Graphics, paintings and drawings backed by the knowledge of botany may result in creating green walls which can be veritable floral masterpieces. Virtual 3D models, on the other hand, enable us to understand better the mutual interaction between the ‘green facades’ and the surrounding urban environment. When designing vertical gardens and green murals, it is worth remembering about all the possibilities offered by sketches and the computer in order to transform urban areas thoughtfully and consciously
Architectural extravagance
Get PDFIn the process of architectural creation the crucial concern is its impressiveness and subsequent assessment. Hence the search for unique solutions that is typical of our times. Sometimes, playing with originality is fun, – conceiving unusual objects which need not obligatorily follow the Vitruvian principles of durability, utility and beauty. Often, temporality, transience and phenomenality, according to the intentions of the creators, are immanent features of many projects
Typological games in multi-family housing
Get PDFSome typologies of contemporary residential housing are characterised by unclear or inconsistently applied classification rules, whereas typology, like a game, requires compliance with some rules. The fact of non-compliance with the rules may turn the typology into a meaningless game and deprive it of its seriousness
Dynamic Modeling and Operation of the Chlor-Alkali Process
Get PDFChlorine it is commonly produced through the Chlor-alkali process, which is an electrochemical process – the process energy consumption dominates the production cost. Therefore, optimization of the process has become a major issue to achieve energy conservation and cost effective production. This study aims at investigating the transient and steady-state behavior of the chlorine production system through process modeling and simulation. Material balance and energy balance of the Chlor-alkali membrane process (electrolysis), brine pre-treatment, and chlorine handling are modelled and investigated using rigorous models. MOSAIC and MATLAB, are used to model and to simulate the process response when receiving dynamic input. For validation, the simulation result is compared to experimental data
Przeginia Duchowna wastewater treatment plant – an evaluation of treatment process efficiency
Get PDFThe paper determines the reliability of the wastewater treatment plant (WWTP) at the Czernichów Municipality. The study was carried out from February 2010 to March 2011. The following physic-chemical sewage quality parameters were analyzed: BOD5, COD and total suspended solids (TSS). While assessing the plant reliability, two indicators were considered: a reliability indicator and an indicator of technical plant efficiency. The number of violations of the effluent limit values, specified in the Regulation of the Minister of the Environment of 24 July 2006 [9] was established