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Publications from the year 2018
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Particulate Matter Production of Small Heat Source Depending on the Bark Content in Wood Pellets
- Michal Holubcik
- Jozef Jandacka
- Radovan Nosek
- Jacek Barański
Wood pellets as biofuel are more and more used in small heat sources in Europe. Standard wood pellets are produced from wood sawdust without bark. The paper deals about the impact of bark in wood pellets on their properties and combustion process. Special attention in this work is paid to production of particulate matter during combustion of wood pellets depending on bark content. There were experimentally produced spruce wood pellet samples with 0, 1, 2, 5, 10, and 20% content of bark. The density, moisture content, calorific value, ash content, and ash fusion temperature were detected on produced samples. Then, the combustion took place in a small heat source which was tested on an experimental device designed for the measuring of heat output and emission production. Based on the achieved results, we can conclude that bark content in pellets has a significant impact not only on wood pellet properties but also on performance and environmental characteristics of pellets. The results showed that growing bark content has negative impact on wood pellet properties, mainly decrease calorific value and ash fusion temperature, and increase ash content. Growing bark content in wood pellets also decreased heat output of heat source and increased gas emissions and particulate matter production.
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Path Loss Measurements in Wideband Radio Link Designed for Maritime Environment
- Piotr Rajchowski
- Krzysztof Cwalina
- Paweł Tomasz Kosz
- Jacek Stefański
- Jarosław Sadowski
In the article, the research and analysis of path loss in designed and evaluated digital radio link for high-speed data transmission in maritime environment is presented. Collected samples of received signal were used to determine the mean path loss and its standard deviation. Measuring campaign was carried out in a real maritime conditions. The mean value of path loss reached 126 dB on a distance of 11.16 km.
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Pavilion Hospitals Of West Prussia In The 19th Century – Evolution Of The Idea
- Anita Jaśkiewicz-Sojak
In the 19th century a number of modern curative and healthcare hospitals with complex functional and spatial layout were erected in the territory of the West Prussia. The largest of them were specialist centers treating physical and mental illnesses and disabilities: institutions for mentally ill patients (including addicts), epileptics and disabled people. Apart from the medical treatment section, there were administrative, social and technical facilities, all constituting parts of the complex. The hospital part was accompanied by entire neighbourhoods for doctors and other hospital workers, green areas (including parks and cemeteries) and farms. Because of that, the complexes were able to operate as self-sufficient towns ensuring living conditions for several hundred hospital patients and workers. The analysis of these large hospitals, their architecture and spatial arrangement, and comparative research show evolution of the pavilion hospitals idea during the 19th century. They also make it possible to show the studied Prussian hospital establishments in a broader context – compared to the whole of Germany and other European countries. The knowledge about this civilizational and spatial phenomenon is very important for the history of architecture in West Prussia (a German region in the past, a part of present Poland). Also recognizing and acknowledging the heritage, which large Prussian hospitals presently constitute, has great impact on their conservation and preservation. Large hospitals in West Prussia were not hitherto subject of comprehensive research, except for the author’s doctoral dissertation.
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Pełnienie nadzoru naukowego nad naprawą po awarii i dalszą budową konstrukcji mostu M-78. Ekspertyza techniczna
- Jacek Chróścielewski
- Mikołaj Miśkiewicz
- Łukasz Pyrzowski
- Bartosz Sobczyk
- Beata Zima
- Krzysztof Wilde
Celem opracowania jest szczegółowa analiza mostu M-78 wykonywanego w ramach zadania „Projekt i budowa drogi ekspresowej S-6 na odcinku od węzła „Kołobrzeg Zachód" /bez węzła/ węzeł „Ustronie Morskie" /z węzłem/ oraz „Budowa obwodnicy m. Kołobrzeg w ciągu drogi krajowej nr 11” ”. Opracowanie w sposób szczegółowy przedstawia prace zrealizowane na potrzeby wydanych opinii technicznych w trakcie realizacji mostu. Zakres opracowania obejmuje: • zapoznanie się z dokumentacją techniczną obiektu, • wizję lokalną, • globalną i lokalne analizy mostu, • wskazanie przyczyn awarii konstrukcji M-78/L podczas sprężania, • ocenę zarysowań konstrukcji M-78/L, • wydanie opinii nt. programu naprawczego dla konstrukcji M-78/L, • wydanie opinii nt. zmian detalu zakotwienia kabli dla konstrukcji M-78/P, • podsumowanie i wnioski.
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Performance Analysis of Developed Multimodal Biometric Identity Verification System
- Andrzej Czyżewski
- Piotr Bratoszewski
- Piotr Hoffmann
- Adam Kurowski
- Michał Lech
- Maciej Szczodrak
The bank client identity verification system developed in the course of the IDENT project is presented. The total number of five biometric modalities including: dynamic handwritten signature proofing, voice recognition, face image verification, face contour extraction and hand blood vessels distribution comparison have been developed and studied. The experimental data were acquired employing multiple biometric sensors installed at engineered biometric terminals. The biometric portraits of more than 10 000 bank clients were registered and stored in the database during the presented study and then verified experimentally. Problem- specific survey was done on the basis of questionnaires completed by the subjects in order to assess the look and feel of the developed biometric system as well as to collect opinions concerning its implementation in banking outlets. A discussion concerning the quality of registered data and results achieved in the study is included.
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Performance of the domestic micro ORC equipped with the shell-and-tube condenser with minichannels
- Jan Wajs
- Dariusz Mikielewicz
- Blanka Jakubowska
In this paper, the original compact shell-and-tube heat exchanger with circular minichannels of in-house design and manufacturing is presented as the condenser for the domestic micro heat and power plant investigations as well as other future technical applications. The heat exchanger is equipped with turbulizing baffles inside the shell. The shell itself is made of a tubular sleeve having an inner diameter of 0.067 m and the length of 0.38 m. The tube bundle constitutes of 103 pipes arranged hexagonally with the active length equal to 0.31 m. The tubes inner diameter equals to 0.002 m and the wall thickness is 0.001 m. The calculations of the heat transfer coefficient for the condensation in the flow of the ethanol as a working fluid was done by means of several methods, among others the one developed in-house. That model accounts for the non-adiabatic effects in the convective heat transfer coefficient. The experimental validation of the prototype construction was accomplished. During the tests the condenser was cooled by water with ethanol as a working fluid. The obtained results are in a good consistency with the in-house model predictions.
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Performance‐driven modeling of compact couplers in restricted domains
- Sławomir Kozieł
- Ari Sigurdsson
Fast surrogate models can play an important role in reducing the cost of EM-driven design closure of miniaturized microwave components. Unfortunately, construction of such models is challenging due to curse of dimensionality and wide range of geometry parameters that need to be included in order to make it practically useful. In this letter, a novel approach to design-oriented modeling of compact couplers is presented. Our method allows for building surrogates that cover wide range of operating conditions and/or material parameters, which makes them useful for design purposes. At the same time, careful definition of the model domain permits dramatic (volume-wise) reduction of the of the design space region that needs to be sampled, thus, keeping the number of training data samples at acceptable levels. The proposed technique is demonstrated using a compact rat-race coupler modeled for operating frequencies from 1 GHz to 2 GHz and power split of –6 dB to 0 dB. Benchmarking and application examples for coupler design optimization as well as experimental validation are also provided.
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Personal Brand Authenticity and Social Media: The Top 5 Football Players’ Case
- Wioleta Kucharska
- Agnieszka Firgolska
he authenticity is a key factor which attracts the interest of young consumers in the more and more dominant virtual world full of “fake news”,“fake images”, and “fake impressions”. The celebrity authenticity is also important when it comes to gain the positive attitude of the audience and the success in the long term. The unique talent is crucial for all stars. According to football stars, the authenticity of their personal brands next to the extreme talent also brings greater financial success to the player due to the cooperation with media and advertising industry. The aim of the presented study is to explore the antecedents of the personal brand authenticity of the TOP5 most valuable football celebrities in the social media. To do it, the authors conducted a study among 496 Polish social media users. The presented study is the first sector analysis which assesses the authenticity of football celebrities' brands. The data have been analyzed by the structural equation modeling method (SEM). The findings suggest that consistency and candidness are the factors which to the greatest extent determine the authenticity of football celebrities in the social media.
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Personal Brand Value and Social Media, the Top Football Players’ Case
- Wioleta Kucharska
Personal branding valuation and social media usage are new and empirically unexplored areas of research. The aim of the presented study is to determine how social media performance and sentiment are related to the value of a personal brand. Based on an example of 100 most valuable football players, in reference to transfermarkt.com and the sentione.com (sentiment analysis), the author points out the strongest correlations and cross-correlations between a personal brand value and the sentiment measured for social media such as forums, microblogs, blogs, portals, FB (Facebook), and photo& video platforms. The author claims that in the case of top football players’ personal brands, competencies (professional first and social next) to a large extent determine their reputation. Presented findings suggest that social media is a perfect modern tool for sustaining personal brand equity and creating a final value through the relational capital creation. This is the first study which examines the social media top football players personal brands performance in the relation to their market value, including sentiment analysis. Results of this study deliver the clear evidence which of platforms are the most effective to promote football players personal brands in social media, what is important for the theory application.
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Personal branding of artists and art-designers: necessity or desire?
- Wioleta Kucharska
- Piotr Mikołajczak
Purpose Personal branding becomes a new in-demand skill for all professionals today. To be well-known helps to achieve success in the networked business environment. Personal relationships and a good reputation in the reality of network economy help young artists and art designers move up the career ladder. This paper aims to discuss a problem of artists who often find it difficult to define their artistic and self-distinction identities. The concept of personal brand and branding seems quite irrelevant, especially in reference to their own selves. People usually associate branding with marketing, which in our minds is usually the same as “pushy” and aggressive sales practices. Their find problematic to promote themselves. The purpose of this paper is to highlight that, based on existing theories, artistic identity creation in connection with the skill of personal branding is crucial for personal success in the profession of today’s young artists and art designers. Design/methodology/approach The study was conducted based on the data originally collected among artists, designers, architecture professionals and students. The data have been analyzed with the equal structural equation modeling method. Findings This paper presents empirical evidence that if artists view themselves as personal brands, it affects their personal performance in a positive way. Practical implications Authors claim that a teaching curriculum for young adult artists should include a personal branding program, to help them find and support their artistic identity and express their personal values and self-brand distinction, and leverage them to build their professional career. Originality/value This is one of the first studies to quantify the self-brand performance of young art designers as a benefit of being self-brand oriented.
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Personal Branding—A New Competency in the Era of the Network Economy. Corporate Brand Performance Implications
- Wioleta Kucharska
Primary assets of the network economy are information, network, re-lationships, knowledge, and a virtual environment. The competency of personal branding exercised by knowledge workers, also thought of as knowledge producers, is becoming a natural consequence of the business environment where the significance of hierarchies is constantly decreasing. Knowledge workers are powerful as never be-fore and can exist as separate actors within a business network. In consequence, personal brands’ reputation of professionals and the reputation of companies they work for become closely related. Bear-ing in mind the CSR context, the objective of this study is to exam-ine the influence of corporate brand’s and personal brand’s reputa-tion on corporate brand performance to discover the power of com-mon influence. To achieve this goal, using the equal structural mod-elling method, the author analysed 209 cases of Polish employees working for knowledge-intensive services (KIS). The findings sug-gest that in order to achieve better business results a company brand and a professional brand should support one another with the mutual respect of company and employee values which are embedded in corporate social responsibility approach.
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PHASE OBJECT OBSERVATION SYSTEM BASED ON DIFFRACTION PHASE MICROSCOPY
- Sylwia Babicz-Kiewlicz
- Barbara Stawarz-Graczyk
- Paweł Wierzba
In the paper authors present a special measurement system for observing phase objects. The diffraction phas microscopy makes it possible to measure the dimensions of a tested object with a nanometre resolution. To meet this requirement, it is proposed to apply a spatial transform. The proposed setup can be based either on a two lenses system (called 4 f ) or a Wollaston prism. Both solutions with all construction aspects are described in the paper. To make a full analysis of the object shape the authors developed an accurate image processing algorithm, also presented in the paper.
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Phase-difference positioning in asynchronous system
- Jarosław Sadowski
This paper presents concept and implementation of digital positioning system based on phase difference measurements, designed as a navigational aid for marine applications. Main feature of proposed system is the ability to work in both synchronous mode, with one master station and set of slave stations synchronized with master, and in asynchronous mode with independent clocking of all stations.
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Physical crosslinking of hyaluronic acid in the presence of phospholipids in an aqueous nano-environment
- Piotr Bełdowski
- Piotr Weber
- Andra Dedinaite
- Per Claesson
- Adam Gadomski
Hyaluronic acid and phospholipids are two components in the synovial joint cavity that contribute to joint lubrication synergistically. Molecular dynamics simulations were performed and hydrogen bonds in hyaluronic acid were analyzed to identify specific sites that are responsible for its physical cross-linking. Two molecular masses of hyaluronic acid, 10 kDa and 160 kDa, were considered. We use molecular dynamics simulations and the small world network approach to investigate dynamic couplings using a distance map applied to oxygen atoms in a chain of hyaluronic acid in the presence of phospholipids and water. The distance characterizing the coupling can be defined in various ways to bring out the most evident differences between various scenarios of the polymer chain conformation We show herein a physical distance understood as H-bond length and classes of these distances which are defined in a coarse-grained picture of the molecule. Simulation results indicate that addition of phospholipids has little influence on hyaluronic acid crosslinking. However, longer chains and addition of lipids promote appreciably long lasting (resilient) networks that may be of importance in biological systems. Specific sites for hydrogen bonding of phospholipids to hyaluronic acid have also been identified.
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Phytoavailability of potentially toxic elements from industrially contaminated soils to wild grass
- Galina Yotova
- Boika Zlateva
- Sonya Ganeva
- Vasil Simeonov
- Błażej Kudłak
- Jacek Namieśnik
- Stefan Tsakovski
Topsoil and grass samples from 14 sites located in different distances from three copper mining factories and a copper smelter were collected in Srednogorie, Bulgaria. The paper discusses results of studies on the mobility of potentially toxic elements (As, Cd, Cr, Cu, Mn, Ni, Pb, Zn) from contaminated soils to wild grass Cynodon dactylon in terms of transfer (TF: soil to plant) and phytoavailability (PF: EDTA (ethylenediaminetetraacetic acid)-soluble to plant) factors. Soils located close to mine and smelter factories were heavily contaminated by As and Cu reaching levels up to 500 mg/kg and 2400 mg/kg, respectively for As and Cu. At seven sites arsenic and copper in grass were over the normal levels (1 mg/kg As; 20 mg/kg Cu). The content of Cu in grass averaged 63 mg/kg exceeding the maximum allowable for sheep. Relationship between PF and TF values was found for As, Cd, Cu, Ni, Pb, Zn but not for Mn and Cr. To some extent the soil pH, TOM (total organic matter) and CaCO3 content are related to the phytoavailability of As, Cd and Cu since for Zn and Pb this relation is attributed to Al and Fe-content of soil. Statistically significant correlation coefficients were determined between the EDTA-soluble fraction of soil and content in grass in the case of As, Cd, Cr, Cu, Mn and Pb indicating the suitability of the short procedure for phytoavailability studies of those elements. The application of hierarchical cluster analysis and self-organizing maps of Kohonen made it possible to reveal specific hidden relationships between the soil variables and transfer factors as well as between the sampling locations. This additional information helps in more detailed interpretation of phytoavailability and transfer processes in the region of interest. The novelty in this study is achieved by careful consideration of the possibility of using EDTA extracts of the toxic metals in investigating of the phytoavailability and transfer processes soil/plant. Additionally, chemometric expertise used makes it possible to differentiate the behavior of each toxic metal in the processes studied. The combination of easy option for rapid extraction and intelligent data analysis gives a new perspective for contributions in explanation of the complex interactions between soils and plants when assessing pollution events in a certain environment.
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Piękno i Energia – odnalezione wartości w budowaniu współczesnego miejskiego środowiska zamieszkania
- Gabriela Maria Rembarz
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Platform governance for sustainable development: Reshaping citizen-administration relationships in the digital age
- Tomasz Janowski
- Elsa Estevez
- Rehema Baguma
Changing governance paradigms has been shaping and reshaping the landscape of citizen-administration relationships, from impartial application of rules and regulations by administration to exercise its authority over citizens (bureaucratic paradigm), through provision of public services by administration to fulfil the needs of citizens (consumerist paradigm), to responsibility-sharing between administration and citizens for policy and service processes (participatory paradigm). The recent trend is the administration empowering citizens to create public value by themselves, through socio-technical systems that bring data, services, technologies and people together to respond to changing societal needs. Such systems are called “platforms” and the trend is called “platform paradigm”. The aim of this article is to offer a conceptual framework for citizen-administration relationships under the platform paradigm. While existing models of citizen-administration relationships mainly focus on specific types of relationships, e.g. citizen trust versus administrative transparency, or citizen satisfaction versus administrative performance, the proposed framework identifies a comprehensive set of relationships that explain how decisions by citizens or administration and the policy environment mutually agreed by them contribute to shaping such relationships and building individual and collective capacity for pursuing sustainable development. The framework comprises 15 types of relationships organized along the four governance paradigms. It is illustrated through the analysis of 11 case studies published in the current issue. Based on this analysis, the article also formulates some insights that are relevant to researchers and policymakers who intend to utilize platform governance for sustainable development.
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Płyty przedprożowe z elewacji dawnego budynku jatek mięsnych w Gdańsku?
- Elżbieta Nakonieczna
Podczas badań archeologicznych prowadzonych w latach 2004-2005 na terenie historycznych jatek mięsnych głównomiejskiego cechu rzeźników w Gdańsku, kierujący badaniami Robert Krzywdziński postawił tezę, że fragmenty płaskorzeźbionej dekoracji ściany szczytowej od strony ulicy Mariackiej, zniszczonego w 1945 roku budynku jatek, zostały wykorzystane jako elementy dekoracyjnych płyt przedprożowych podczas powojennej odbudowy kamienicy przy ulicy Mariackiej 52. Celem niniejszego artykułu jest możliwie pełna odpowiedź na postawiony przez Krzywdzińskiego problem badawczy. Przeprowadzona analiza materiałów źródłowych, ikonograficznych i kartograficznych, dotyczących kamienicy przy ulicy Mariackiej 52 w Gdańsku, pozwoliła na stwierdzenie, że w momencie zniszczenia w 1945 roku, kamienica najprawdopodobniej w ogóle nie posiadała przedproża. Natomiast w balustradzie zrealizowanego do 1973 roku, w ramach powojennej odbudowy przedproża kamienicy przy ul. Mariackiej 52, wykorzystano pochodzące z końca XVII wieku relikty trzech płaskorzeźbionych ażurowych płyt oraz dwóch płaskorzeźbionych słupków wykonanych z piaskowca. Na jednoznaczne stwierdzenie, skąd pochodzą wtórnie wykorzystane w balustradzie przedproża relikty, pozwala zdjęcie ze zbiorów Piotra Popińskiego, dokumentujące wystarczająco dokładnie stan zachowania dekoracji rzeźbiarskiej ściany szczytowej od strony ulicy Mariackiej budynku jatek mięsnych około 1930 roku. Powiększenie fotografii umożliwia rozpoznanie charakterystycznych wizerunków byków oraz baraniej głowy, przedstawionych na trzech płytach zdobiących fasadę zniszczonego w 1945 roku budynku. Rozpoznawalny jest także rzeźbiarski ornament o motywach roślinnych, zdobiący cztery płaskorzeźbione słupki stanowiące pierwotne ramy kompozycyjne dla płyt. Ponadto w balustradzie powojennego przedproża kamienicy wykorzystano pozostałości dokładnie trzech płaskorzeźbionych płyt i dwóch słupków, co dodatkowo potwierdza potencjalną możliwość wtórnego użycia zachowanych fragmentów dekoracji rzeźbiarskiej ściany szczytowej budynku jatek mięsnych.