Volume 6, Year 2015, Issue 2, April-June

6 x
Hand Motion Tracking with Tablet Devices as a Human-Computer Interface for People with Cerebral Palsy
Katarzyna Barczewska, Filip Malawski
36 x

Abstract:  This article describes experiments which were conducted with two groups of people: healthy and with cerebral palsy. The purpose of the experiments was to verify two hypothesis: 1) that people with cerebral palsy can interact with computer using their natural gestures, 2) that games for tablets can be a research tool in experiments with young disabled people. Two games, which require the user to make simple gestures to accomplish given tasks, were designed and implemented on a tablet device with a built-in camera. Because of the camera limitations, the tracking process employs blue markers. By moving hand with a blue marker it was possible to perform navigation tasks in both games. In the first game the user had to gather, in 30 seconds, as many objects as possible. The objects were placed on the screen in a grid pattern. In the second game the user had to catch one object 20 times. The position of the object changed after each catch. Results obtained by healthy people were considered as a reference. However there are significant differences between measured parameters in both groups, all persons - healthy and with cerebral palsy - were able to accomplish the tasks by using simple gestures. Games for tablets turned out to be a very attractive research tool from the perspective of young, disabled users. They participated in measurement sessions much more willingly than in experiments without games.

Keywords: human computer interaction, interfaces, gesture recognition

Area: Biomedical Engineering

The effect of the heat treatment on the 7CrMoVTiB10-10 steel's microstructure and its properties
Paweł Bolanowski
27 x

Abstract:  According to the European Standard PN-EN 10216-2 two types of the heat treatment could apply to 7CrMoVTiB10-10 – the modern bainitic boiler steel. The 7CrMoVTiB10-10 steel may have different properties, depending on the chosen method of the heat treatment. This paper shows the differences in the microstructure and the properties occuring after two processes: one of them including normalization and tempering, and the other – hardening and tempering.

Keywords: steel, microstructure, heat treatment, 7CrMoVTiB10-10, normalizing, hardening, tempering

Area: Mechanics, Automatics and Robotics

Study on Filling Patterns of Engineering Polymers in Geometrically Balanced Injection Molds
Przemysław Narowski, Krzysztof Wilczyński
17 x

Abstract:  Filling patterns and imbalances which occur during injection molding of engineering plastics, e.g. Polyoxymethylene (POM), have been studied. Four different geometries of runner systems have been applied for experimentation. Autodesk Moldflow software has been used for finite element method (FEM) simulations of imbalance phenomenon. Evolution strategies have been suggested for optimization of runner systems in multi-cavity injection molds.

Keywords: Injection Molding, Filling Imbalance, FEM Simulations

Area: Nanotechnologies and Materials

Chromatographic fractionation of betacyanins from flowers of Gomphrena globosa
Dominika Szot, Karolina Starzak, Anna Skopińska, Sławomir Wybraniec
15 x

Abstract:  In this study, a chromatographic fractionation of betacyanin pigments from extract of purple Gomphrena globosa petals was performed by preparative high performance liquid chromatography (prep-HPLC). The particular betacyanins in each collected fractions were tentatively identified by chromatography with optical amd mass spetrometric detection (LC-DAD-ESI-MS). Betacyanins are natural pigments, which are confirmed to have an antioxidant activity. It was reported that betacyanins can prevent civilization diseases, because of an ability of free radicals scavenging. Betacyanins are present in tissue of plants from Amaranthaceae family, e.g. in petals of Gomphrena globosa. Preparative separation of these particular pigments is difficult, because they are structurally very similar to each other and tend to coelute. However, in this study, fractions, containing a dominant amount of the principal pigments of Gomphrena globosa inflorescences, were obtained successfully. In the first fractions, two isomeric pigments assigned to gomphrenin I and isogomphrenin I were detected. The fractions of significant amounts of gomphrenin III and isogomphrenin III were obtained separately with sufficient purity. The presence of other, minor gomphrenin-type betacyanins were also confirmed as: gomphrenin II, cis-isomer of gomphrenin II and sinapoyl-gomphrenin I as well as their 15S-diastereomers. Moreover, in other fractions, various unknown pigments were detected

Keywords: betacyanins, Gomphrena globosa, plant pigments, LC-MS

Area: Chemistry and Pharmacy

Experimental and modelling analysis of the separation of ionic salts solution in nanofiltration process
Anna Kowalik-Klimczak, Mariusz Zalewski, Paweł Gierycz
126 x

Abstract:  This paper presents the possibility of the use of Donnan and Steric Partitioning Pore Model (DSPM) based on the extended Nernst-Planck equation for interpretation of the separation of chromium(III) and chloride ions from concentrated salt solution in nanofiltration process. Results of predictions obtained with the analyzed model showed the significant effect of the pore dielectric constant on separation of chromium(III) and chloride ions from concentrated salt solution on nanofiltration membranes. It was found that the increase of pore dielectric constant caused the decrease of chromium(III) and chloride ions separation. Additionally, the satisfactory agreement between experimental and predicted data was stated. The Donnan and Steric Partitioning Pore Model may be helpful for the monitoring of nanofiltration process applied for different industrial wastewater treatment.

Keywords: Nanofiltration, Nernst-Planck equation, Modelling, Salts solution

Area: Environmental Sciences

Application of Voronoi diagrams in contemporary architecture and town planning
Anna Nowak
122 x

Abstract:  Modern design methods rely increasingly on understanding the nature of processes and principles of self-organization of biological structures and their representation using mathematical models that may apply in technology, including architecture. As a result, bionic design elements play a more meaningful role in shaping contemporary architecture and urban planning. The development of computer technology has made it possible to create more complex and complicated structures and surfaces inspired by natural forms. The inspiration for the discretization of the surface, using the Voronoi diagram, as seen in the honeycomb structure or the dragonfly wing, is increasingly applied in shaping the elevation of contemporary buildings. As a mathematical problem, the division of space fascinates scientists as well as architects. Consequently, architects use the spatial Voronoi cells also in shaping the structural forms. Today Voronoi diagrams are an important source of inspiration for architects and urban planners as a surface discretization method and a way of creating structural elements or spatial forms and as flooring patterns in urban projects. The use of mathematical models represent the structure and organization of the forms found in nature, which is increasingly used in the multidisciplinary architectural design. The design of the structures and elements both in architecture and urban planning using methods of computational geometry makes new opportunities for architectural and urban projects as seen by the Voronoi tessellation.

Keywords: bionic design, Voronoi diagram, architecture, town planning

Area: Civil Engineering, Urban Planning and Architecture

Application of the classical method of least squares in the analysis of factors influencing the lease prices of commercial premises on the real estate market as exemplified by Żoliborz district in Warsaw
Magdalena Drouet
19 x

Abstract:  The aim of this article is to investigate whether easy access to green areas has got an influence on the value of the rental rate of commercial premises, and if so – then how to calculate the value of this factor? Determining the value of this factor affects not only the functioning of the commercial premises market, but it is also of high importance at the stage of designing urban solutions within areas designated for commercial purposes. The municipal commercial premises market in the district of Żoliborz was chosen to be the representative sample. The static econometric model was chosen to be the research method.

Keywords: econometric model, transaction price, commercial premises, variables, descriptive statistics.

Area: Civil Engineering, Urban Planning and Architecture

Shaping and structuring of high-rise office buildings in Europe
Joanna Pietrzak
64 x

Abstract:  The subject of the study were high-rise office and mixed-use buildings in Europe, with a height exceeding 150 meters and realized after the year 2000. The aim of the analysis was to examine the correlation between form and structure of the overground parts of this buildings. The skyscrapers were categorized according to the analysis of the core location and the form of the building. The article presents the results of analyses of skyscrapers with a single, inner core. The analyzed high-rise buildings’ forms are highly varied. Although the skyscrapers of biaxial symmetry plans seem to dominate, one can observe the increasing forgoing of design forms with regular, repetitive floors. However, translating the projects with free-form shapes into the material form constitutes a significant problem. The most important parts of the skyscraper are the ground floor and the top part, which is often shaped as a structure between a flat ending and a spire. The structure of high-rise buildings in Europe almost always rely on the cooperation of the core with the peripheral supports. The cores, frames and ceilings are based on different material solutions, but the most common combination is the whole structure made of the monolithic reinforced concrete. The core is usually placed in the central part of the plan and its area on the average equals 23% of the ground floor’s area. The dimensions and areas of the cores are mainly functionally conditioned, and they decrease as the height grows taller.

Keywords: Europe, high-rise office buildings, skyscrapers, shape, structure, core.

Area: Civil Engineering, Urban Planning and Architecture

Technological Interface of the City – The Promise of a Real Bottom-Up Urban Planning?
Artur Jerzy Filip
22 x

Abstract:  The paper shows how developing social networking services, geo-media applications, e-management tools, and even some particular types of web ‘games’ may contribute to the creation of technological interfaces of our cities. Nevertheless, the paper calls into question whether these technological environments may contribute to the real change in urban planning – the change from the top-down to the bottom-up approach.

Keywords: city, interface, technology, bottom-up, urban development

Area: Civil Engineering, Urban Planning and Architecture

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