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Application of zeolites for the adsorptive biogas desulfurization
Get PDFThe article presents the issue of adsorptive removal of hydrogen sulphide from biogas using zeolite. Based on literature data, comparing performance of the biogas desulphurisation process for various mineral adsorbents, eg. activated carbon, zeolites and metal oxides, was carried out. The efficiency of biogas desulphurisation by adsorption on zeolites is significantly lower than for the activated carbons. Therefore, this article presents opportunities for improving efficiency desulphurization by modifying the structure of adsorbents
An Evaluation of Delamination in Composite Structures by Cooling Down Thermography (CDT): Numerical Studies
Get PDFThis paper is devoted to numerical studies of composite structures with delaminations made with the use of CDT. Analysis of temperature distribution provides the opportunity to determine the geometry of subsurface defects. Results confirm the validity of the FE model in comparison to previous experimental investigations
Site-specific art and its avant-garde solutions in a historic city’s cultural space
Get PDFSite-specific art is a term referring to works of art created with a view to functioning strictly in a particular place for a particular location, environment, landscape, a specific and peculiar space. It is deeply contextual, so in regard to the issue of the protection of a historic city, one can ask about its role and scope of creation as a condition for its sustainable development. What is meant by sustainable development? And how to perceive the thought of the great Aquinas, referring to the concept of Creatio (gr.), an act of creative action, bringing some existence to life and keeping it alive – the basic principle of conservation. Let us try to confront the experimental language of contemporary artists with Gombrich’s theory of time-cultural relativism, the meaning of the genius loci of the place, based on sources and our own educational and artistic experience
Urbanity of a city – the dream of the past
Get PDFIn this article the Author makes an attempt at characterizing the notion of urbanity of a city and its significance for maintaining, revitalizing and shaping – today and in the future – of an urban spatial structure. He states that the characteristic feature of a developed area exhibiting an urban character is the occurrence of public spaces – places favouring public (social) use, offering an attractive functional programme, attracting users. Places which stand out in the area of the city thanks to the characteristic properties of their forms, creating easily identifiable sequences of spaces in the city, exhibiting a desirable human scale of development and urban interiors formed by it. Places exhibiting distinct identity features, thanks to maintaining, adopting or creating contemporary interpretation of the tradition of the place and the historic heritage of the material culture. Places which stand out with their attractive, diversified forms of architecture, the richness of shapes, details, colours, picturesqueness of the atmosphere created by them
Numerical Simulation of Viscoelastic Fluid Flow in Stirred Vessels
Get PDFIn this work, a tool for calculating viscoelastic flows with rotating geometries in OpenFOAM based on the finite-volume method is presented. The tool combines the split-stress tensor approach and viscoelastic differential constitutive equations with the sliding-mesh technique. With this tool, a CFD simulation was run for a geometry of a spherical stirrer in an aqueous solution of carboxyl cellulose. Additionally, a rheological characterisation of that solution was conducted. For validation, the simulations were compared with flow field data acquired through particle image velocimetry measurements
Stabilising feedback in Max-Plus linear models of discrete processes
Get PDFThis article relates to a synthesising output feedback that is used to control a network of discrete events. The feedback stabilises the system without reducing its initial throughput and its synthesis is mainly based on the theory of residues and the Kleene operator. This article suggests some theoretical results and mathematical foundations of max-plus algebra theory, and in particularly, discusses various other aspects of controlling discrete processes and their modelling in the context of a linear max-plus system
Mobile Pilot-Plant for the Evaluation of Novel Scrubbing Liquids for the Absorption of CO2 from Industrial Gases
Get PDFMost available scrubbing liquids suffer from either high heating duties for the regeneration or vulnerability towards gas components. In order to increase the efficiency of the absorption process a novel scrubbing liquid has been developed by thyssenkrupp Industrial Solutions AG. For verifying relevance and feasibility of long-term operation of the new fluid assumptions for installation were created – conceptual design and detailed simulation of the process without detailed thermodynamic information
Games and play between architecture and art in view of the perception of space
Get PDFThis paper is focused on reflections concerning games and play of architecture with art, taking place in the context of a new paradigm of interactive perception of sensual space, analysed on selected representative examples. In the face of globalization, games and play with architecture in the form of ironic or whimsical designs offer diverse aesthetic perceptions, bordering on kitsch and consumer and commercial mega-gadgets
Hopscotch
Get PDFHow to play the city game in the greatest city in the world? Build, do not ask for anything. And how to locate skyscrapers? Far enough away from each other, to ensure that the worse does not fall on the good one. And what to do when the territory ends? O ccupy another, and call it all Mexico City. And how do you plan the development of this city? Do not plan, development will be faster. And is this city inhabitable at all
Power industry – coal ecology
Get PDFIn this work, the fuel structure of electric energy production is presented, and also the coal-based power industry influence on the environment, greenhouse effect, mercury emissions from coal burned by power stations. EU requirements regarding limits of mercury emissions, as well as methods and techniques enabling reduction of mercury emissions originating from coal burning processes