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  • TRANSFORMACJA ŚRÓDMIEŚCIA GDAŃSKA – WYBRANE ASPEKTY KREOWANIA NOWEGO OBLICZA CENTRUM METROPOLII
    • Piotr Lorens
    2018

    W ramach artykułu poruszono zagadnienia związane z uwarunkowaniami oraz specyfiką kształtowania obszaru Śródmieścia Gdańska. Obszar ten – podobnie jak ma to miejsce w odniesieniu do innych dużych polskich miast – łączy w sobie funkcje centrum kształtującej się metropolii, z obszarem, o niezwykle dużej atrakcyjności turystycznej. Równocześnie wskazać można na jego specyficzne cechy, odróżniające go od innych obszarów centralnych: stanowi ono tylko jedno z szeregu ogniw centralnego pasma usługowego metropolii, dysponuje znaczącymi rezerwami obszarów rozwojowych, w jego granicach lokuje się obecnie znaczący program mieszkaniowy o charakterze śródmiejskim, a wreszcie – realizowane inwestycje w sposób znaczący zmieniają geometrię powiązań funkcjonalno – przestrzennych obszaru. Dodatkowo wskazać należy na zmieniający się w ostatnich latach kontekst ogólno-miejski i regionalny: także i w tym wypadku przekształcenia istniejących struktur i realizowane nowe inwestycje o charakterze infrastrukturalnym (i nie tylko), uznać należy za czynnik odróżniający sytuację Śródmieścia Gdańska, od obszarów centralnych innych polskich miast. Na tym tle nieco dokładnej przedstawione zostały procesy przekształceń wybranych obszarów, w tym w szczególności: transformacja Wyspy Spichrzów, rozwój Młodego Miasta, realizacja Forum Gdańsk oraz przekształcenia dzielnicy Długie Ogrody. Omówione zostały także projekty i przedsięwzięcia związane z rewitalizacją oraz przekształceniami obszarów zdegradowanych, stanowiących naturalne dopełnienie w/w przedsięwzięć, o strategicznym dla całości Śródmieścia charakterze. Podsumowaniem tych rozważań stały się refleksje Autora, dotyczące relacji pomiędzy realnie zachodzącymi procesami rozwojowymi, a koncepcjami urbanistycznymi i planistycznymi dla przedmiotowego obszaru.

  • TRANSMISJA KOOPERACYJNA W SIECIACH 4G I 5G
    • Andrzej Marczak
    2018 Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

    W referacie przedstawiono zagadnienia związane z transmisją kooperacyjną w sieciach bezprzewodowych czwartej i piątej generacji. Transmisja kooperacyjna polega na wykorzystaniu terminali ruchomych jako stacji przekaźnikowych w celu poprawy jakości transmisji, poprawy wydajności sieci i zmniejszenia zużycia energii.

  • Transmitting Alarm Information in DAB+ Broadcasting System
    • Przemysław Falkowski-Gilski
    2018

    The main goal of digital broadcasting is to deliver high-quality content with the lowest possible bitrate. This paper is focused on transmitting alarm information, such as emergency warning and alerting, in the DAB+ (Digital Audio Broadcasting plus) broadcasting system. These additional services should be available at the lowest possible bitrate, in order to provide a clear and understandable voice message to people. Furthermore, additional information should not put stress on the ensemble management process, nor affect full-time audio services.

  • Transport i obróbka przedmiotów na docierarkach tarczowych
    • Adam Barylski
    2018 Pełny tekst Autobusy. Technika, Eksploatacja, Systemy Transportowe

    Docieranie i szlifowanie należy do podstawowych metod obróbki wykończeniowej. Technologie te stosowane sa obecnie zarówno w obróbce elementów metalowych, jak i niemetalowych. W artykule przeanalizowano czas jaki jest potrzebny do wykonania tych operacji.

  • Treatment of bitumen post oxidative effluents by sulfate radicals based advanced oxidation processes (S-AOPs) under alkaline pH conditions
    • Andre Fernandes
    • Patrycja Makoś
    • Grzegorz Boczkaj
    2018 JOURNAL OF CLEANER PRODUCTION

    Sulfate radicals based Advanced Oxidation Processes (S-AOPs), namely Persulfate and peroxymonosulfate, were used for the treatment of post oxidative effluents from a production of petroleum bitumens under alkaline pH. Studies on the identification and monitoring of the volatile organic compounds (VOCs) along with COD, BOD and sulfide ions reduction were performed. Persulfate with a ratio between the oxygen from the oxidant and the COD in the effluents (rox) of 1.28 at 60 °C achieved 33% and 55% reduction of COD and BOD respectively. Peroxymonosulfate with a rox of 1.43 at 60 °C was the most effective S-AOP studied with 43% COD and BOD reduction. Sulfide ions were effectively oxidized in both technologies. Persulfate at lower rox 0.41 at 40 °C was the best process to treat VOCs. A detailed analysis of the effluents composition after treatment revealed VOCs by-product formation. Economical evaluation revealed that persulfate based processes were cheaper. Activation of PS and PMS by heat can occur but effectiveness of this method of activation is low. S-AOPs revealed to be effective as a pre-treatment method in terms of VOCs degradation. These studies also proved that a secondary treatment is mandatory for a cleaner production of petroleum bitumens.

  • Triangulation-based Constrained Surrogate Modeling of Antennas
    • Sławomir Kozieł
    • Ari Sigurdsson
    2018 Pełny tekst IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION

    Design of contemporary antenna structures is heavily based on full-wave electromagnetic (EM) simulation tools. They provide accuracy but are CPU-intensive. Reduction of EM-driven design procedure cost can be achieved by using fast replacement models (surrogates). Unfortunately, standard modeling techniques are unable to ensure sufficient predictive power for real-world antenna structures (multiple parameters, wide parameter ranges, highly-nonlinear responses). Here, a design-oriented modeling technique is introduced, in which the most critical part is the domain definition. The surrogate is constructed in the region based on a set of reference designs, optimized with respect to userselected figures of interest such as operating frequencies, bandwidth, substrate permittivity, etc. The domain is spanned by the simplexes, obtained by triangulation of the reference designs, further extended into their orthogonal complements. Restricting the model domain as above permits dramatic reduction of the number of training data samples necessary to build a reliable model, as compared to the conventional approach. The proposed modeling framework is demonstrated using three examples, a UWB monopole, and two dual-band antennas. Comprehensive benchmarking as well as application studies and experimental verification are also provided.

  • Tribo-Environment Dependent Chemical Modification of Sliding Interfaces in Ultrananocrystalline Diamond Nanowall Film: A Correlation with Friction and Wear
    • Revati Rani
    • Kalpataru Panda
    • Niranjan Kumar
    • Sankaran Kamatchi
    • Ramanathaswamy Pandian
    • Mateusz Ficek
    • Robert Bogdanowicz
    • Ken Haenen
    • I-Nan Lin
    2018 Pełny tekst Journal of Physical Chemistry C

    Tribological properties of ultrananocrystalline diamond nanowall (UNCD NW) films were investigated quantitatively in three different and controlled tribo-environmental conditions, proposing the passivation and graphitization mechanisms. However, these mechanisms are rather complicated and possibly can be understood in well-controlled tribological conditions. It was shown that the friction and wear of these films were high in highPage 1 of 40 ACS Paragon Plus Environment The Journal of Physical Chemistry 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 2 vacuum and room temperature (HV-RT) tribo-condition in which the passivation of carbon dangling bonds was restricted and frictional shear-induced transformation of sp3 carbon into amorphous carbon (a-C) and tetrahedral amorphous carbon (t-aC) was noticed. However, the friction coefficient was reduced to the ultralow value in ambient atmospheric and room temperature (AA-RT) tribo-condition. Here, both passivation of dangling bonds through atmospheric water vapor and graphitization of the contact interfaces were energetically favorable mechanisms. Furthermore, the conversion of diamond sp3 into hydrogenated-graphitized phase was dominating mechanism for observed super-low friction coefficient and ultra-high wear resistance of films in high-vacuum and high-temperature (HV-HT) tribo-condition. These mechanisms were comprehensively investigated by micro-Raman and X-ray photoelectron spectroscopy analyses of the sliding interfaces.

  • TRWAŁOŚĆ PROJEKTU ERASMUS+ SP4CE - STUDIUM PRZYPADKU
    • Anna Czaja
    • Anna Grabowska
    • Ewa Kozłowska
    2018 Pełny tekst Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej

    Projekt ERASMUS+ Partnerstwo Strategiczne na Rzecz Kreatywności i Przedsiębiorczości (ang. Strategic Partnership for Creativity and Entrepreneurship - SP4CE) dotyczył wdrażania i upowszechniania innowacyjnych rozwiązań wzmacniających współpracę europejską w dziedzinie kształcenia i szkolenia zawodowego. Działania projektowe były związane z promowaniem innowacyjnych praktyk w edukacji oraz szkoleniach poprzez wspieranie spersonalizowanych metod uczenia się, współpracy grupowej, krytycznego myślenia, strategicznego wykorzystania technologii informacyjnych i komunikacyjnych (TIK), otwartych zasobów edukacyjnych (ang. Open Educational Resources - OER), otwartego i elastycznego uczenia się, mobilności wirtualnej oraz innych innowacyjnych metod kształcenia. Uruchomiona w projekcie platforma SP4CE umożliwia interdyscyplinarną międzynarodową współpracę oraz udostępnianie materiałów szkoleniowych w pięciu językach partnerskich. Platforma wykorzystuje oprogramowanie WordPress i Moodle. Zarejestrowani użytkownicy współpracują w tzw. pokojach nauki (ang. Learning Rooms). Trwałość projektu SP4CE ilustrują pokoje nauki założone i aktywne również po jego zakończeniu. Są one dostępne w następujących kategoriach: SPADE ERASMUS+, Prace naukowe, Gamifikacja w szkoleniach, Autoryzowane Centrum Szkolenia Autodesk Politechniki Gdańskiej, Współpraca Partnerów Akademickich Autodesk.

  • Trzmiele- ważne owady zapylające. Wykorzystanie jako organizmów wskaźnikowych- wyzwanie dla analityków.
    • Żaneta Bargańska
    • Jacek Namieśnik
    2018 Analityka: Nauka i Praktyka

    Większość roślin do wydania owoców i nasion wymaga zapylenia przez owady, które w poszukiwaniu pokarmu- nektaru i pyłku- przenoszą go z jednego kwiatu na drugi. Tak jest w przypadku drzew i krzewów owocowych, a także wielu warzyw. Rośliny , pomimo obfitego kwitnienia wiosną, bez pomocy owadów nie wydadzą plonu latem. W krajobrazie rolniczym zapylenie roślin uprawnych jest tak samo ważnym czynnikiem plonotwórczym, jak nawożenie lub ochrona upraw przed szkodnikami i chorobami. Zatem owady zapylające są istotnym czynnikiem gwarantującym rozmnażanie i przetrwanie wielu gatunków roślin. Zbyt mała ilość tych owadów w sadach, uprawnych krzewów owocowych, roślin dyniowatych czy też pomidorów powoduje gorsze wykształcenie owoców i gorszą jakość nasion.

  • TS-based RSM-aided design of cold-formed steel stiffened C-sectional columns susceptible to buckling
    • Patryk Deniziak
    • Karol Winkelmann
    2018 Pełny tekst

    The paper focuses on joint-performance analysis of a built-up cold-formed thin-walled C-sectional column with a fillister (stiffener) of the same type, interconnected with a series of bolts located along the length of the compressed members in specific spacing. The quantity of bolts and the non-connected starting distance of the fillister are considered random variables of the problem. Optimal distribution of joints on the stiffener is found by means of Response Surface Methodology, based on Targeted Sampling technique. The critical load of the column is the response of the random model, dependent on random input parameters. The load values are computed by means of discrete realizations of the column FE model.

  • TSR method for burns investigation approach
    • Mariusz Kaczmarek
    2018

    The article presents the possibilities of applying the TSR method for the diagnosis of burn wounds. The wound area is stimulated by cold gas and a sequence of thermograms of heating the tissue is recorded. Next, TSR algorithms are used to determine the parameters that allow the wound to be classified into one of the classes: the wound heals within three weeks, the wound will not heal in three weeks. The method was validated on a series of in-vivo experiments on animals and on several clinical case.

  • Tuning of microstructure in engineered poly (trimethylene terephthalate) based blends with nano inclusion as multifunctional additive
    • A. R. Ajitha
    • V. G. Geethamma
    • Mathew Lovely
    • Saha Prosenjit
    • Kalarikkal Nandakumar
    • Thomas Sabu
    • Michał Strankowski
    2018 POLYMER TESTING

    Immiscible blends and their composites are heterogeneous and have variable morphology due to variation in mesophase regions. Tuning, i.e. controlling the phase dimension is important, thereof we report a “super-combo” effect of multiwalled carbon nanotubes (MWCNTs) in poly (trimethylene terephthalate)/polypropylene (PTT/ PP) blend system. MWCNTs act as a good reinforcing agent and compatibilizer in the otherwise immiscible PTT/ PP blend. PTT/PP blends (with varying blend ratio and MWCNT loading) were melt mixed and later compression molded. The fabricated sheets were characterized for mechanical and morphological properties. Information regarding morphology was determined using scanning electron microscope (SEM) and transmission electron microscope (TEM). Dispersion of MWCNT in PTT was confirmed by the TEM images. Better understanding is in sighted by carrying out a correlation between mechanical properties with morphology, in-line with theoretical equations and selective dissolution experiments. Mechanical properties of all blend compositions were enhanced with the addition of 1 wt % MWCNTs, in which the blend having higher composition of PTT shows excellent mechanical properties. The addition of different MWCNTs loading in to the 90PTT/10PP composition shows a significant increase in Young's modulus and experimental values showed good alignment with theoretical values especially at lower filler loadings. Key findings from the morphology are in agreement with the mechanical properties and so we propose the super combo effect of MWCNTs as a compatibilizer and reinforcing agent for PTT/PP immiscible blend system. Through performed experiments and theoretical studies, we firmly believe that engineered composites with stabilized morphology will be a promising candidate for engineering materials with diverse applications.

  • Turán numbers for odd wheels
    • Tomasz Dzido
    • Andrzej Jastrzębski
    2018 Pełny tekst DISCRETE MATHEMATICS

    The Turán number ex(n,G) is the maximum number of edges in any n-vertex graph that does not contain a subgraph isomorphic to G. A wheel W_n is a graph on n vertices obtained from a C_{n−1} by adding one vertex w and making w adjacent to all vertices of the C_{n−1}. We obtain two exact values for small wheels: ex(n,W_5)=\lfloor n^2/4+n/2\rfloor, ex(n,W_7)=\lfloor n^2/4+n/2+1 \rfloor. Given that ex(n,W_6) is already known, this paper completes the spectrum for all wheels up to 7 vertices. In addition, we present the construction which gives us the lower bound ex(n,W_{2k+1})>\lfloor n^2/4 \rfloor + \lfloor n/2 \rfloor in general case.

  • Turbulence models impact on the flow and thermal analyses of jet impingement
    • Tomasz Kura
    • Elżbieta Fornalik-Wajs
    • Jan Wajs
    • Sasa Kenjeres
    2018 Pełny tekst MATEC Web of Conferences

    Accurate numerical reconstruction of heat and mass transfer processes in particular applications, such a jet impingement, is difficult to obtain even with the use of modern computational methods. In the proposed paper, the flow and thermal phenomena occurring during single minijet impingement on the flat, concave and convex, heated surfaces were considered. Problem of impingement on non-flat surface, still not common and purely described in the literature, can be of big importance in engineering applications, such as the heat exchangers. Numerical analyses, based on the mass, momentum and energy conservation laws, were conducted with the OpenFOAM software. Focus was placed on the proper model construction, in which turbulence and boundary layer modelling was crucial, due to their significance in the heat transfer processes. Analysis of results obtained by RANS models focused mostly on the comparison of turbulent and hydrodynamics parameters.

  • Turmeric nanofiber-encapsulated natural product formulation act as a phytogenic feed additive—A study in broilers on growth performance, biochemical indices of blood, and E. coli in cecum
    • Sreeraj Gopi
    • Augustine Amalraj
    • Karthik Varma
    • Shintu Jude
    • Prakash Reddy
    • Chandradhara Divya
    • Józef Haponiuk
    • Sabu Thomas
    2018 INTERNATIONAL JOURNAL OF POLYMERIC MATERIALS

    A phytogenic feed additive (PFA) formulation was prepared with bioactive molecules—curcuminoids, gingerol, and carvacrol by encapsulating in nanofiber isolated from turmeric spent (turmeric nanofiber, TNF). This formulation was completely characterized by scanning electron microscope, ultra performance liquid chromatography, and gas chromatography and evaluated for its efficacy. PFA-encapsulated TNF (PFA@TNF) considerably increased mean body weight, decreased cholesterol level, mortality rate, and reduced Escherichia coli content of broilers than antibiotic growth promoter (AGP). The depth of crypts in the ileum of broilers was considerably reduced by the inclusion of PFA@TNF in diets compared with the AGP.

  • Twierdzenie - rysunek
    • Krzysztof Wróblewski
    2018

  • Two-Dimensional Gas Chromatography Coupled With Mass Spectrometry in Food Analysis
    • Tomasz Dymerski
    2018 Pełny tekst CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY

    The development of instrumental analytical techniques provided the opportunity for in-depth characterization of many food matrices. In particular, the use of gas chromatography coupled with mass spectrometry gives impressive results in terms of quality and authenticity testing, conducting food freshness evaluations and contamination assessments. A new variant of gas chromatography, namely two-dimensional gas chromatography (GC × GC), and various versions of mass spectrometry have been developed since last 15 years, and they still remain at the time of their renaissance. The present critical review is focused on the use of GC × GC coupled with mass spectrometry for qualitative and quantitative reasons in food analysis. It is explained how powerful analytical tool is above-mentioned technical solution. Special attention is devoted to the issues related to the development of this technique during last years in terms of key construction elements, such as modulators and MS detectors. Finally, the critical discussion on many various aspects including advantages and more important disadvantages, caused probable moderate interest of this solution, in food analytics is concerned.

  • Two-dimensional hydrogen-like atom in a weak magnetic field
    • Radosław Szmytkowski
    2018 Pełny tekst European Physical Journal Plus

    We consider a non-relativistic two-dimensional (2D) hydrogen-like atom in a weak, static, uniform magnetic field perpendicular to the atomic plane. Within the framework of the Rayleigh-Schr¨odinger perturbation theory, using the Sturmian expansion of the generalized radial Coulomb Green function, we derive explicit analytical expressions for corrections to an arbitrary planar hydrogenic bound-state energy level, up to the fourth order in the strength of the perturbing magnetic field. In the case of the ground state, we correct an expression for the fourth-order correction to energy available in the literature.

  • Two-Stage Identification of Locally Stationary Autoregressive Processes and its Application to the Parametric Spectrum Estimation
    • Maciej Niedźwiecki
    • Marcin Ciołek
    2018

    The problem of identification of a nonstationary autoregressive process with unknown, and possibly time-varying, rate of parameter changes, is considered and solved using the parallel estimation approach. The proposed two-stage estimation scheme, which combines the local estimation approach with the basis function one, offers both quantitative and qualitative improvements compared with the currently used single-stage methods.

  • Two-step Conversion of Crude Glycerol Generated by Biodiesel Production into Biopolyols: Synthesis, Structural and Physical Chemical Characterization
    • Aleksander Hejna
    • Paulina Kosmela
    • Marek Klein
    • Krzysztof Formela
    • Milena Kopczyńska
    • Józef Haponiuk
    • Łukasz Piszczyk
    2018 JOURNAL OF POLYMERS AND THE ENVIRONMENT

    In this work biopolyols were synthesized via two-step process from crude glycerol and castor oil. For better evaluation of analyzed process, the impact of its time and temperature on the structure and properties of biopolyols was determined. Obtained results fully justified conducting of synthesis in two steps. Prepared materials were characterized by hydroxyl value and water content comparable to polyols industrially applied in manufacturing of polyurethane materials. Synthesized biopolyols were characterized in terms of their chemical structure using spectroscopic techniques: Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance spectroscopy. Obtained data confirmed the influence of synthesis’ parameters on the chemical structure of prepared biopolyols and correlated with their other parameters. On both stages of reaction, collected by-products were also analyzed with FTIR spectroscopy.