2018 - Repozytorium publikacji - Politechnika Gdańska

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L'economia mondiale dopo la guerra fredda
- Luciano Segreto
2018
Che cosa è successo negli equilibri economici mondiali a partire dal 1989 e dalla dissoluzione del vecchio ordine sovietico? Dopo aver esaminato gli Usa e i suoi competitori asiatici, Giappone e Cina, il libro si concentra sull’Europa e sulle grandi trasformazioni portate dalla riunificazione tedesca, da Maastricht e dalla nascita dell’euro. Infine analizza, nell’ambito della globalizzazione, il ruolo dei BRICS, lo sviluppo economico di nuove aree del pianeta e il loro impatto sull’economia mondiale. Un quadro fortemente segnato dalla crisi economica e finanziaria internazionale dell’ultimo decennio.
Legal destructive entrepreneurship in the modern economy
- Jarosław Ziętarski
2018 Pełny tekst EKONOMIA I PRAWO
Motivation: Usually examples of activities that have a positive impact on the economy of the state are cited. Destructive entrepreneurship refers to activities that have negative impact on the economy. This phenomenon is relatively new in the literature and does not yet have a precise definition. Aim: The aim of this article is to attempt a definition of the phenomenon of legal destructive entrepreneurship. The author also analysed the characteristics of legal entrepreneurial behaviour that have a negative impact on the economy of the state. Results: Based on the different definitions the author proposes to adopt a definition on the basis of which a division into legal and illegal entrepreneurship as well as productive, unproductive and destructive entrepreneurship was made. Author provides comparative analysis of different types of legal destructive entrepreneurship and gives examples of its manifestation under modern economy
Lepiszcza gumowo-asfaltowe modyfikowane za pomocą związków zawierających reaktywne grupy izocyjanianowe
- Kaja Borzędowska-Labuda
2018 Pełny tekst
W niniejszej pracy otrzymano i przebadano właściwości fizyko-mechaniczne, reologiczne, i stabilność nowej grupy lepiszczy asfaltowych, zawierających rozdrobnione odpady gumowe lub kompozycje gumowo-olejowe i 4,4'-diizocyjanian difenylometanu modyfikowany karbodiimidem. Wykonane badania ukierunkowane na otrzymanie lepiszczy gumowo-asfaltowych, charakteryzujących się polepszoną stabilnością podczas ich magazynowania i transportu, odpowiednią lepkością dynamiczną oraz korzystnymi parametrami użytkowymi, takimi jak: penetracja, temperatura mięknienia, moduł zachowawczy czy moduł stratności.
Light-Induced Transformation of the Aromatic Heptaene Antifungal Antibiotic Candicidin D into Its All-Trans Isomer
- Paweł Szczeblewski
- Tomasz Laskowski
- Aleksandra Bałka
- Edward Borowski
- Sławomir Milewski
2018 JOURNAL OF NATURAL PRODUCTS
Illumination of the aromatic heptaene macrolide antifungal antibiotic candicicin D with UV light results in an isomerization of the molecule. The product formed after irradiation of the candicidin complex with UV light (λ=365nm), namely, iso-candicidin D, was isolated and subjected to 2D NMR studies, consisting of DQF-COSY, ROESY, TOCSY, HSQC, and HMBC experiments. The obtained spectral data unambiguously evidenced that iso-candicidin D was the alltrans isomer of the native antibiotic, and straightening of the heptaenic chromophore was the only light-induced structural change that occurred. Hence, iso-candicidin D was proclaimed to be a prototype of a novel class of polyene macrolide antifungal antibiotics: the all-trans aromatic heptaenes, containing a macrolide ring similar to that of amphotericin B.
Lignin-based carbon fibers for renewable and multifunctional lithium-ion battery electrodes
- Andrzej Nowak
- Johan Hagberg
- Simon Leijonmarck
- Hannah Schweinebarth
- Darren Baker
- Anders Uhlin
- Per Tomani
- Göran Lindbergh
2018 Pełny tekst HOLZFORSCHUNG
Lignin-based carbon fibers (LCFs) from the renewable resource softwood kraft lignin were synthesized via oxidative thermostabilization of pure melt-spun lignin and carbonization at different temperatures from 1000°C to 1700°C. The resulting LCFs were characterized by tensile testing, scanning electron microscopy (SEM), X-ray diffraction (XRD) and confocal Raman spectroscopy. The microstructure is mainly amorphous carbon with some nanocrystalline domains. The strength and stiffness are inversely proportional to the carbonization temperature, while the LCFs carbonized at 1000°C exhibit a strength of 628 MPa and a stiffness of 37 GPa. Furthermore, the application potential of LCFs was evaluated as negative electrodes in a lithium-ion battery (LIB) by electrochemical cycling at different current rates in a half-cell setup. The capacity drops with the carbonization temperature and the LCFs carbonized at 1000°C have a capacity of 335 mAh g−1. All LCFs showed good cycling stability. Because of the mechanical integrity and conductivity of the LCFs, there is no need to apply current collectors, conductive additives or binders. The advantage is an increased gravimetric energy density compared to graphite, which is the most common negative electrode material. LCFs show a promising multifunctional behavior, including good mechanical integrity, conductivity and an ability to intercalate lithium for LIBs.
Likwidacja suchego doku przy Nabrzeżu Przemysłowym w Porcie Gdańsk
- Adam Bolt
- Witold Sterpejkowicz-Wersocki
- Mirosława Pilarska
- Tomasz Bolt
2018 Pełny tekst Inżynieria Morska i Geotechnika
W niniejszej pracy przedstawiono problemy techniczne związane z likwidacją dużego obiektu hydrotechnicznego, stanowiącego utrudnienie nawigacyjne w intensywnie eksploatowanym portowym kanale dostępowym w Porcie Gdańsk. Dwukomorowy dok zlokalizowany przy Nabrzeżu Przemysłowym wybudowano w latach 1970-1972. Komory dokowe służyły do budowy żelbetowych, pływających skrzyń falochronowych, na potrzeby budowanego w tym czasie Portu Północnego. W pracy przedstawiono charakterystykę obiektu wraz z charakterystyką warunków geotechnicznych i hydrostatycznych, przedstawiono przebieg kolejnych etapów prac rozbiórkowych. Na podstawie badań odbiorczych dna przy nabrzeżu oraz badań stanu podłoża przed ścianką szczelną nabrzeża dokonano oceny możliwości zwiększenia głębokości technicznej nabrzeża do rzędnej -10,0 m A. Po przeprowadzonych robotach rozbiórkowych, pracach rewitalizacyjnych oraz badaniach odbiorowych nabrzeże przekazano do eksploatacji.
Linear Pantographic Sheets: Existence and Uniqueness of Weak Solutions
- Victor Eremeev
- Francesco dell'Isola
- Claude Boutin
- David Steigmann
2018 Pełny tekst JOURNAL OF ELASTICITY
we address the well-posedness of the planar linearized equilibrium problem for homogenized pantographic lattices. To do so: (i) we introduce a class of subsets of anisotropic Sobolev’s space as the most suitable energy space E relative to assigned boundary conditions; (ii) we prove that the considered strain energy density is coercive and positive definite in E ; (iii) we prove that the set of placements for which the strain energy is vanishing (the so-called floppy modes) must strictly include rigid motions; (iv) we determine the restrictions on displacement boundary conditions which assure existence and uniqueness of linear static problems. The presented results represent one of the first mechanical applications of the concept of Anisotropic Sobolev space, initially introduced only on the basis of purely abstract mathematical considerations.
Linkages between services and manufacturing as a new channel for GVC growth: evidence from CEE countries
- Aleksandra Kordalska
- Magdalena Olczyk
2018
The aim of this paper is to use a panel Granger causality test to verify the hypothesis of the existence of a causal relationship between forward linkages from domestic services to manufacturing and a country’s participation and position in GVCs in selected central and eastern European economies – the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland and Slovakia – for the period 2000-2014. Our results show that the Baltic countries (Estonia, Lithuania, Latvia) along with the Czech Republic strengthen their positions and participation in GVCs by having a strong relationship between the financial sector and manufacturing. Poland, Hungary and Slovakia reinforce their positions and participation in GVCs by means of strong linkages between transport services and manufacturing. We also find an importance of the reverse relationship, i.e. participation in GVCs by CEE economies and the positions they occupy influence the linkages between services and manufacturing, mainly in the transport sector and in professional, scientific and technical activities. The strength of the relationship is sensitive to the linkage measure used.
Listening to Live Music: Life beyond Music Recommendation Systems
- Bożena Kostek
2018
This paper presents first a short review on music recommendation systems based on social collaborative filtering. A dictionary of terms related to music recommendation systems, such as music information retrieval (MIR), Query-by-Example (QBE), Query-by-Category (QBC), music content, music annotating, music tagging, bridging the semantic gap in music domain, etc. is introduced. Bases of music recommender systems are shortly presented, including the mechanisms underlying these systems. Also, usage of machine learning versus statistics is discussed with regard to the recommender systems working. Moreover, listening to music through players implemented on computers or mobile devices as opposed to listening to live music in the context of social and technology implications, i.e. live performance contrasting issues related to music quality. Finally, future directions in the music recommendation area and live music are discussed, including performance on virtual musical instruments.
L'Italie. Gagner à tout prix. L'industrie de l'armenent italien pendant la Grande Guerre
- Luciano Segreto
2018
The chapter outlines the economic and technological transformations of the Italian armament industry during the First World War
Literature update of analytical methods for biogenic amines determination in food and beverages
- Justyna Płotka-Wasylka
- Jacek Namieśnik
- Myrsini Papageorgiou
- Ewa Kłodzińska
- Calum Morrison
- Dimitra Lambropoulou
2018 Pełny tekst TRAC-TRENDS IN ANALYTICAL CHEMISTRY
Biogenic amines (BAs) have been reported in a variety of foods, such as fish, meat, cheese, and wines. The formation of BAs in food by the microbial decarboxylation of amino acids can result in human allergic reactions, characterized by difficulty in breathing, rash, vomiting, and hypertension. Control measures to prevent biogenic amine formation in foods and/or reduce their levels should be considered. Therefore, monitoring of BAs in food samples with the application of analytical techniques is of high importance. This review is based on literature data from 2010 until today and refers to food samples and alcoholic beverages. The rationale of this study is to provide data for the occurrence of BAs in food and beverages samples and a comparison of the analytical techniques and challenges in liquid and solid matrices. Importantly, BAs can be used as future markers for quality and freshness of the food products and alcoholic beverages.
Load carrying capacity of the eccentric joint in the truss made of open cross-sections
- Małgorzata Gordziej-Zagórowska
- Elżbieta Urbańska-Galewska
2018 Pełny tekst MATEC Web of Conferences
The influence of eccentricity at intersections of truss members on the load carrying capacity of the truss joint is presented in the paper. The research truss elements were designed as cold-formed open cross section. Analytical calculations, numerical analysis and experimental research were conducted to reveal how the eccentricity affects the effort of material in the joint area. The results of analysis and investigations are compared and discussed. The main achievement of the tests carried out is statement that slender plane members of the compression chords are safe compared with the results of analytical calculations.
Load test of new European record holder in span length among extradosed type bridges
- Mikołaj Miśkiewicz
- Łukasz Pyrzowski
2018 Pełny tekst
The article presents acceptance load tests of a newly built extradosed MS-3 bridge located along the national road DK-16 near Ostróda (Poland). The structure features significant dimension in European reference scale. It is a new record holder in span length regarding this distinct bridge category. Its length ranges 206 m. Static and dynamic load tests were performed here. The program was extended by entire structural laser scanning and identification of natural vibration forms.
Load testing of a suspended footbridge in Radom (Poland)
- Mikołaj Miśkiewicz
- Łukasz Pyrzowski
- Krzysztof Wilde
- Jacek Chróścielewski
- Jerzy Kałuża
2018
The footbridge in Radom is a suspended bridge of an interesting architectural form. The structure was de-signed for 4 kN/m2 of crowd loading. Dynamic calculations were not included in the design. The structure’s acceptance tests took place on the 14th of October 2016. The behaviour of the footbridge in static testing met the expectations. Unfortunately, as a result of dynamic tests, dangerous behaviour of the footbridge was revealed. A rhythmic jump test induced deck vibrations with an acceleration of 4.51 m/s2. For this reason, a newly built object has not been approved for use and the structure requires installation of additional damping devices. The article presents analyses of the load test design stage, describing performed tests and their re-sults, showing the comparison of theoretical and measured parameters and further indicating the improper dynamic behaviour which prevented the structure usage until the repair.
Load-carrying capacity of axially loaded concrete-filled steel tubular columns made of thin tubes
- Marcin Abramski
2018 Pełny tekst Archives of Civil and Mechanical Engineering
An experimental investigation was conducted on 30 CFST columns. An influence of the following factors on load-carrying capacity of the investigated columns was analyzed: the column slenderness (l1 = 42, l2 = 27 and l3 = 15), the tube thickness (the reinforcement ratio was equal to 4% or 6%), the way of applying the load to CFST columns (through the concrete core or through the entire cross-section), the bond strength between a steel tube and a concrete core. The results of the experimental investigation let the author derive a practical method of determining load-bearing capacity of CFST columns. The Eurocode 4 provisions regulating composite steel and concrete structures design impose the minimum share of a steel tube in the cross-sectional area of a CFST column. This minimum share is the prerequisite for the Eurocode 4 to be applicable. It ranges from 0.5% to 6%. As the experimental research presented in the paper indicate, the CFST columns of such low reinforcement ratios can be also effective in carrying loads. The proposed method is a second order analysis based on stiffness, similarly as the calculation procedure for the ordinary reinforced concrete columns which is used in Eurocode 2. The experimental results prove the author's suggestion to be correct.
Local buckling of compressed flange of cold-formed channel members made of aluminum alloy
- Marcin Kujawa
- Czesław Szymczak
2018
The paper deals with local buckling of a compressed single flange of thin-walled channel cold- formed columns and beams made of aluminum alloy. Material is described by means of the Ramberg-Osgood constitutive equation. Axial compression of the columns and beams undergoing bending is taken into consid- eration. A simple model of the member flange in the form a long beam elastically connected to the web is used to find the critical buckling stress. The governing differential equation is derived with the aid of the sta- tionary total potential energy principle. The tangent modulus theory is applied to find the critical buckling stress and buckling modes. Analytical formulas of the critical stress and buckling mode are positively verified by the FEM and FSM analysis of numerical examples.
Local electrochemical impedance spectroscopy in dynamic mode of galvanic coupling
- Łukasz Burczyk
- Kazimierz Darowicki
2018 ELECTROCHIMICA ACTA
A novel method that combines local electrochemical impedance spectroscopy and mapping in dynamicmode is proposed. Method was validated over two galvanic couplings, namely zinc/copper and cad-mium/copper. Impedance spectrum response for all measuring points was obtained by means ofsimultaneous implementation of selected range of frequencies. Proposed method allows the measure-ment in a more time-efﬁcient manner, at the same time providing extensive impedance characteristic.Moreover, the aspect of probe-to-sample distance was introduced. Furthermore, the inversion of theprobe-to-sample distance experiment direction allows for determination of approaching procedure forlocal impedance measurements (with support of theoretical calculations). Proposed method wascompared with standard LEIS measurement on system which undergoes rapid changes, giving resultsthat were not obtainable with standard method. This indicates that by applying dynamic measurements,it is possible to introduce additional variable into the investigated system, what should contribute tobroader application of local impedance measurements.
Local Nusselt number evaluation in the case of jet impingement
- Tomasz Kura
- Elżbieta Fornalik-Wajs
- Jan Wajs
- Sasa Kenjeres
2018 Pełny tekst
Jet impingement still is one of demanding cases regarding computational fluid dynamics, due to its highly turbulent behaviour, with occurrence of turbulent-laminar transition. Even recently developed methods exhibit some drawbacks – RANS based simulations lack accuracy, LES and DNS based ones require too much computational time. Hybrid methods also exist, but their development and validation is in progress. Nevertheless, CFD application can play major role in the investigation of jet impingement phenomena. While the flat surface impingement is widely discussed in the literature, there is lack of data regarding non-flat surfaces – the ones that might exist for example in the heat exchangers. In the following paper, the numerical simulation of both flat and non-flat surfaces single jet impingement is presented, with the aim of precise description of the turbulence models impact on the thermal and hydrodynamic results. Choice of turbulence model is crucial for sufficient calculation outcome. Only the complex analyses, shown in the article, including the turbulence and momentum budgets comparison between particular models, can reveal significant and meaningful differences.
Long Distance Vital Signs Monitoring with Person Identification for Smart Home Solutions
- Maciej Szankin
- Alicja Kwaśniewska
- Jacek Rumiński
- Mingshan Wang
- Tejaswini Sirlapu
- Rey Nicolas
- Marko Bartscherer
2018 Pełny tekst
Abstract— Imaging photoplethysmography has already been proved to be successful in short distance (below 1m). However, most of the real-life use cases of measuring vital signs require the system to work at longer distances, to be both more reliable and convenient for the user. The possible scenarios that system designers must have in mind include monitoring of the vital signs of residents in nursing homes, disabled people, who can’t move, constant support for people regardless of the performed activity (e.g. during sleeping), infants, etc. In this work we verified the possibility of remote pulse estimation at a distance above 5m. Additionally, we integrated the deep learning algorithm for person tracking and identification, even when facial features are not visible. In this way, we enabled the collection of user specific measurements to create personalized vital signs patterns and we provided the support for monitoring of multiple people using one video stream. The preliminary results showed that it is possible to accurately (RMSE < 2.8 beats per minute) extract pulse from visible light sequences acquired with a webcam at a distance of 6m after applying a proper image pre-processing algorithm.
Longin Kurski - Profesor Politechniki Gdańskiej, żołnierz I i II wojny światowej
- Witold Parteka
2018 Pełny tekst Maszyny Elektryczne : zeszyty problemowe
W artykule przedstawiono sylwetkę wykładowcy Politechniki Gdańskiej z Wydziału Elektrycznego. Profesor nadzwyczajny mgr inż. Longin Kurski był żołnierzem Polskiej Organizacji Wojskowej, absolwentem Wydziału Elektrycznego Politechniki Warszawskiej, inżynierem elektrykiem w: Polskich Kolejach Państwowych, Zarządzie Miejskim, w Elektrowni Miejskiej w Warszawie. W latach 1931-1939 był nauczycielem w szkole zawodowej w Warszawie. Żołnierz wojny obronnej 1939 roku, jeniec oflagu w: Linzu i Woldenbergu, od 1 maja do 20 lipca 1945 roku był oficerem armii angielskiej. W latach 1945-1971 był wykładowcą na Politechnice Gdańskiej, pełnił funkcję prodziekana Studium Wieczorowego na Wydziale Elektrycznym (1955-1958). W latach 1945-1947 pracował w Głównym Urzędzie Morskim, w latach 1948-1950 w Gdańskim Urzędzie Morskim w Gdańsku. W latach 1952-1955 pełnił funkcję dziekana Wydziału Elektrycznego Wieczorowej Szkoły Inżynierskiej w Gdańsku. Był nauczycielem w Państwowym Liceum Budownictwa Okrętowego w Gdańsku (1948-1951) i w Oficerskiej Szkole Marynarki Wojennej w Gdyni (1951-1954). W 1966 roku otrzymał tytuł profesora nadzwyczajnego. Pełnił funkcję sekretarza Wydziału IV (Nauk Technicznych) Gdańskiego Towarzystwa Naukowego.