2016 - Repozytorium publikacji - Politechnika Gdańska

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Geodesy measurement techniques as an enrichment of archaeological research workflow
- Patryk Ziółkowski
- Jakub Szulwic
2016
Use of geodesy techniques is widespread in different fields of science. Especially in such an emerging and dynamic branch of science as archaeology. Warsaw Institute of Archaeology, conducts many archaeological expeditions, among the others Polish-Georgian archaeological expedition in Gonio, where ancient Roman Bath has been discovered and excavated. Gonio is located in Adjara, Georgia, placed on the Black Sea coast. Fortress of Gonio is an ancient Roman fortification, the oldest reference to the fortress is dated for a 1st century AD. After decomposition of Roman Empire, the fortress came under a Byzantine influence. In XVI century Fort was occupied by Ottoman Empire until XIX century, where has been taken by Russian Empire. After decomposition of Soviet Union, and restoring Georgian independence, Gonio is located in the well-developing area and experiencing a tourist boom. Whereas very intense archaeological works are held in this area. Archaeological workflow demands significant labour effort and might be augmented and accelerated by the proper use of geodesy techniques. Reduction of work effort saves not only labour costs but also another important factor, time. This paper focused on a review of geodesy techniques which may have an application in archaeology, with especially insight on the use of remote sensing methods.
Geometrically nonlinear FEM analysis of FGM shells based on neutral physical surface approach in 6-parameter shell theory
- Stanisław Burzyński
- Jacek Chróścielewski
- Karol Daszkiewicz
- Wojciech Witkowski
2016 Pełny tekst COMPOSITES PART B-ENGINEERING
The paper presents the formulation of the elastic constitutive law for functionally graded materials (FGM) on the grounds of nonlinear 6-parameter shell theory with the 6th parameter being the drilling degree of freedom. The material law is derived by through-the-thickness integration of the Cosserat plane stress equations. The constitutive equations are formulated with respect to the neutral physical surface. The influence of the power-law exponent, micropolar characteristic length is evaluated in geometrically nonlinear FEM analyses. The results obtained with the neutral physical surface approach are compared with those computed with the middle surface approach. The influence of choice of the reference surface is observed especially in nonlinear stability analysis.
Geometry Parametric Model Order Reduction with Randomly Generated Projection Bases
- Valentin De La Rubia
- Adam Lamęcki
- Michał Mrozowski
2016
In this work, a reduced-order model for geometry parameters and fast frequency sweep is proposed. The Finite Element Method is used to solve time-harmonic Maxwell’s equations. Taking into account the electromagnetic field does not arbitrarily vary as a function of frequency and geometry parameters, a low dimension system manifold is identified. Thus, the original Finite Element problem can be approximated by a model of reduced size. The basics ingredients of this approach are (1) the use of field solutions at properly selected frequencies for given geometry parameters as basis functions to project the original system, and (2) the use of a mesh deformation technique to write down the electromagnetic field upon the same mesh, i.e., preserving its topology, for different geometry parameters. This allows us to effectively take geometry parameters into account for Model-Order Reduction
Giant Nernst effect in the incommensurate charge density wave state of P4W12O44
- Kamil Kolincio
- Daou Ramzy
- Pérez Olivier
- Guérin Laurent
- Fertey Pierre
- Alain Pautrat
2016 Pełny tekst PHYSICAL REVIEW B
We report the study of Nernst effect in quasi-low-dimensional tungsten bronze P4W12O44 showing a sequence of Peierls instabilities. We demonstrate that both condensation of the electronic carriers in the charge density wave state and the existence of high-mobility electrons and holes originating from the small pockets remaining in the incompletely nested Fermi surface give rise to a Nernst effect of a magnitude similar to that observed in heavy fermion compounds.
Global Competitiveness and Economic Growth: A One-Way or Two-Way Relationship?
- Magdalena Olczyk
- Aleksandra Kordalska
2016 Pełny tekst EQUILIBRIUM Quarterly Journal of Economics and Economic Policy
The Global Competitiveness Index is treated as a standard to measure the competitiveness of countries. Leaders look at it to make policy and resource allocation decisions because global competitiveness is expected to be related to economic growth. However, studies which analyze the empirical relationship between these two economic categories are very rare. It is still an open question in the literature whether economic growth can be used to predict future global competitiveness or the other way round. This paper empirically tests the relationship between the GCI and the economic growth rate by using a panel Granger causality analysis based on annual data for 114 countries divided into five groups by income criteria and covering the period 2006-2014. We confirm a strong unidirectional causality among the countries analyzed, i.e. GDP growth causes global competitiveness. Additionally, we find that the GCI is successful in predicting economic growth for the majority low income and OCED high income counties, but among the middle income countries this relationship exists only for large economies such as China and India.
Global defensive sets in graphs
- Robert Lewoń
- Anna Małafiejska
- Michał Małafiejski
2016 Pełny tekst DISCRETE MATHEMATICS
In the paper we study a new problem of finding a minimum global defensive set in a graph which is a generalization of the global alliance problem. For a given graph G and a subset S of a vertex set of G, we define for every subset X of S the predicate SEC ( X ) = true if and only if | N [ X ] ∩ S | ≥ | N [ X ] \ S | holds, where N [ X ] is a closed neighbourhood of X in graph G. A set S is a defensive alliance if and only if for each vertex v ∈ S we have SEC ({v}) = true. If S is also a dominating set of G (i.e., N [ S ] = V ( G ) ), we say that S is a global defensive alliance. We introduce the concept of defensive sets in graph G as follows: set S is a defensive set in G if and only if for each vertex v ∈ S we have SEC ({v}) = true or there exists a neighbour u of v such that u ∈ S and SEC ({v, u }) = true. Similarly, if S is also a dominating set of G, we say that S is a global defensive set. We also study the problems of total dominating alliances (total alliances) and total dominating defensive sets (total defensive sets), i.e., S is a dominating set and the induced graph G [ S ] has no isolated vertices. In the paper we proved the N P -completeness for planar bipartite subcubic graphs of the decision versions of the following minimalization problems: a global and total alliance, a global and total defensive set. We proposed polynomial time algorithms solving in trees the problem of finding the minimum total and global defensive set and the total alliance. We obtained the lower bound on the minimum size of a global defensive set in arbitrary graphs and trees.
Global value chains and productivity gains: a cross-country analysis
- Aleksandra Kordalska
- Aleksandra Parteka
- Joanna Wolszczak-Derlacz
2016 Pełny tekst Roczniki Kolegium Analiz Ekonomicznych
The main aim of this article is to assess the implications of involvement in global value chains (GVC) on sectoral productivity growth from the international perspective. Our panel data analysis covers 40 countries, 20 industries (13 manufacturing and 7 services sectors) in the period 1995–2011. Estimation results suggest that there is a positive link between TFP growth and the involvement of sectors in global value chains (measured as a share of foreign value added in exports). In particular, positive impact of foreign value added on TFP growth takes place mainly in manufacturing sectors. The results are robust to changes in productivity growth measurement.
Global Value Chains and Wages: International Evidence from Linked Worker-Industry Data
- Aleksandra Parteka
- Joanna Wolszczak-Derlacz
2016
Using a rich dataset on over 110,000 workers from nine European countries and the USA we study the wage response to industry dependence on foreign value added. We estimate a Mincerian wage model augmented with an input-output interindustry linkages measure accounting for task heterogeneity across workers. Low and mediumeducated workers and those performing routine tasks experience (little) wage decline due to major dependency of their industries on foreign inputs. Workers from former EU15 are more in danger of unfavourable wage effects than workers from new EU member states. American workers employed in service industries are more exposed than manufacturing workers.
Globalne trendy w certyfikacji systemu zarządzania środowiskowego
- Elwira Brodnicka
- Marcin Jakubiec
2016 Pełny tekst Przedsiębiorstwo we współczesnej gospodarce - teoria i praktyka
Minimalizacja wpływu działalności organizacji na środowisko naturalne jest jednym z najważniejszych założeń strategicznych przedsiębiorstw. Działania te wynikają z wdrażania strategii CSR, która w odniesieniu do polityki środowiskowej w organizacjach realizowana jest poprzez system EMAS bądź wymagania normy ISO 14001. Wdrożenie Systemu Zarządzania Środowiskowego, a następnie poddanie systemu certyfikacji przez niezależną jednostkę jest niezbędnym krokiem w realizacji systemu EMAS. W artykule została przedstawiona liczba certyfikacji systemu zarządzania środowiskowego na zgodność z normą ISO 14001 zarejestrowana przez organizację ISO oraz wiodącą jednostkę certyfikującą w Polsce. Z przeprowadzonej analizy danych z raportu ISO Survey wynika, że liczba wydanych certyfikatów na świecie od 2008 r. nieustannie wzrasta. Najwięcej certyfikatów od 2012 r. wydano w branży budowlanej, najmniej zaś w branży spożywczej. Z danych jednostki certyfikującej wynika, iż w Polsce od 2012 do 2014 wydano 148 certyfikatów, w tym 30 nowych. Również w Polsce przedsiębiorstwa z branży budowlanej najczęściej poddawały się certyfikacji na zgodność z wymaganiami ISO 14001.
Główne elementy projektu regatowej łodzi podwodnej „Nautilus” napędzanej mechanicznie
- Janusz Kozak
- Agnieszka Czaja
- Piotr Dąbrowski
2016 Prace Wydziału Nawigacyjnego Akademii Morskiej w Gdyni
W pracy przedstawiono wybrane rozwiązania projektu podwodnego pojazdu regatowego o napędzie mięśniowym: analizę oporową kadłuba, koncepcję systemu sterującego, rozwiązania układu napędowego oraz geometrię pędnika. Projekt został wykonany przez Koło Naukowe CAD/CAE Studentów PG „PIKSEL”, działające na Wydziale Oceanotechniki i Okrętownictwa Politechniki Gdańskiej.
Gminny Program Rewitalizacji Miasta Starogard Gdański
- Piotr Lorens
- Sławomir Ledwoń
2016
Publikacja stanowi podsumowanie prac nad programem rewitalziacji miasta. Ujeto w nim zagadnienia delimitacji obszaru zdegradowanego i obszaru rewitalizacji, a także zapisy samego planu.
Gold nanoparticles for cancer radiotherapy: a review
- Kaspar Haume
- Soraia Rosa
- Sophie Grellet
- Małgorzata Śmiałek-Telega
- Karl Butterworth
- Andrey V. Solov’yov
- Kevin Prise
- Jon Golding
- Nigel J. Mason
2016 Pełny tekst Cancer Nanotechnology
Radiotherapy is currently used in around 50% of cancer treatments and relies on the deposition of energy directly into tumour tissue. Although it is generally effective, some of the deposited energy can adversely affect healthy tissue outside the tumour volume, especially in the case of photon radiation (gamma and X-rays). Improved radiotherapy outcomes can be achieved by employing ion beams due to the characteristic energy deposition curve which culminates in a localised, high radiation dose (in form of a Bragg peak). In addition to ion radiotherapy, novel sensitisers, such as nanoparticles, have shown to locally increase the damaging effect of both photon and ion radiation, when both are applied to the tumour area. Amongst the available nanoparticle systems, gold nanoparticles have become particularly popular due to several advantages: biocompatibility, well-established methods for synthesis in a wide range of sizes, and the possibility of coating of their surface with a large number of different molecules to provide partial control of, for example, surface charge or interaction with serum proteins. This gives a full range of options for design parameter combinations, in which the optimal choice is not always clear, partially due to a lack of understanding of many processes that take place upon irradiation of such complicated systems. In this review, we summarise the mechanisms of action of radiation therapy with photons and ions in the presence and absence of nanoparticles, as well as the influence of some of the core and coating design parameters of nanoparticles on their radiosensitisation capabilities.
Gorączka nanozłota
- Izabela Kondratowicz
2016 Fizyka w Szkole
Wraz z rozwojem nanotechnologii naukowcy zaczęli przyglądać się na nowo strukturom znanym na co dzień. Kiedy przyszła kolej na złoto, okazało się, że wraz z redukcją wymiarów ziaren drastycznej zmianie ulegają właściwości tego metalu.
GPR investigation of the strengthening system of a historic masonry tower
- Magdalena Rucka
- Jacek Lachowicz
- Monika Zielińska
2016 JOURNAL OF APPLIED GEOPHYSICS
In this paper the condition assessment of the strengthening system of a masonry tower was carried out by the GPR method. The study provided unique experimental data acquired during measurements of the reinforced concrete frame embedded in masonry walls. Conducted numerical and experimental investigations were focused on the phenomenon of the diffraction-refraction scattering of the electromagnetic energy. A hyperbola resulting from the diffraction of the electromagnetic wave by a steel rod revealed a clear refraction point at the boundary between concrete and the brick wall. A novel procedure for determining the boundary between two media, where one of them contains a circular inclusion, was developed. A system of equations describing the refracted hyperbolic diffraction curve was derived. The study demonstrated that the identification of the actual width of the reinforced concrete strengthening was possible analysing refracted waves previously diffracted on bars, where the point of refraction indicated the boundary between media. Numerical simulations of electromagnetic wave propagation were carried out to enhance the interpretation of results of GPR surveys in the complex masonry structure strengthened by reinforced concrete. The particular interest was paid on characteristics of wave patterns at the boundary between media having different electrical properties. The obtained numerical and experimental results revealed the high usefulness of the GPR method in the diagnosis of wall structures made with different materials.
GPR simulations for diagnostics of a reinforced concrete beam
- Jacek Lachowicz
- Magdalena Rucka
2016
The most popular technique for modelling of an electromagnetic field, the finite difference time domain (FDTD) method, has recently become a popular technique as an interpretation tool for ground penetrating radar (GPR) measurements. The aim of this study is to detect the size and the position of damage in a reinforced concrete beam using GPR maps. Numerical simulations were carried out using the finite differ-ence time domain method. Four different damage scenarios with different crack width and shape were investigated. The influence of the frequency of applied electromagnetic (EM) waves on the possibility of damage detection was examined.
GPU-accelerated finite element method
- Adam Dziekoński
- Adam Lamęcki
- Michał Mrozowski
2016
In this paper the results of the acceleration of computations involved in analysing electromagnetic problems by means of the finite element method (FEM), obtained with graphics processors (GPU), are presented. A 4.7-fold acceleration was achieved thanks to the massive parallelization of the most time-consuming steps of FEM, namely finite-element matrix-generation and the solution of a sparse system of linear equations with the conjugate gradient method and a V-cycle multilevel preconditioner.
Graphene hydrogels with embedded metal nanopatricles as efficient catalysts in 4-nitrophenol reduction and methylene blue decolorization
- Kamila Sadowska
- Izabela Kondratowicz
- Maria Gazda
2016 Pełny tekst Polish Journal of Chemical Technology
Synthesis and characterization of the graphene hydrogels with three different metallic nanoparticles, that is Au, Ag and Cu, respectively is presented. Synthesized in a one-pot approach graphene hydrogels with embedded metallic nanoparticles were tested as heterogeneous catalysts in a model reaction of 4-nitrophenol reduction. The highest activity was obtained for graphene hydrogel with Cu NPs and additional reaction of methylene blued degradation was evaluated using this system. The obtained outstanding catalytic activity arises from the synergistic effect of graphene and metallic nanoparticles. The hydrogel form of the catalyst benefits in the easiness in separation from the reaction mixture (for example using tweezers) and reusability.
Graphene oxide, reduced graphene oxide and composite thin films NO2 sensing properties
- Katarzyna Dunst
- Piotr Jasiński
2016
A graphene oxide (GO), reduced graphene oxide (RGO) and poly(3,4-ethylenedioxytiophene)-reduced graphene oxide (PEDOT-RGO composite) gas sensors were successfully fabricated using an electrodeposition method. The electrodeposition was carried out in aqueous GO dispersions. To obtain RGO and PEDOT-RGO, the electrochemical reduction of GO and PEDOT-GO was carried out in 0.1 M KCl at a constant potential of −0.85 V. The GO, RGO and PEDOT-RGO composite were characterized by scanning electron microscopy (SEM). The fabricated sensors showed sensitivity to NO2 gas. In this work the sensing response of GO, RGO and PEDOT-RGO in NO2 at elevated temperatures were investigated. The influence of the operating temperature on the gas sensing response were compared. The role of the polymer and RGO in PEDOT-RGO composite was discussed. The results are discussed in light of recent literature on graphene sensors.
Greedy Multipoint Model-Order Reduction Technique for Fast Computation of Scattering Parameters of Electromagnetic Systems
- Michał Rewieński
- Adam Lamęcki
- Michał Mrozowski
2016 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
This paper attempts to develop a new automated multipoint model-order reduction (MOR) technique, based on matching moments of the system input–output function, which would be suited for fast and accurate computation of scattering parameters for electromagnetic (EM) systems over a wide frequency band. To this end, two questions are addressed. Firstly, the cost of the wideband reduced model generation is optimized by automating a greedy multipoint MOR scheme. This is achieved by introducing a new dual local-global model convergence scheme, which applies fast and reliable a posteriori error estimates to check both local model convergence, used to select the number of moments at a single expansion point, and global model convergence, used to optimally select the expansion points. Secondly, the question of optimal convergence measure is addressed by proposing an enhanced a posteriori error estimator particularly suited for scattering parameter computations for lossy EM systems. The effectiveness and efficiency of the proposed automated scheme is verified through numerical simulations using reduced-order models for examples of a bandstop dielectric resonator filter and a dielectric resonator antenna for a wide frequency band, and compared against the results obtained using the full-order model, a reduced model generated with the optimal greedy point selection algorithm, as well as the reduced-order models obtained using the reduced basis method (RBM) and the single-point second-order Arnoldi method for passive order reduction (SAPOR) method.
Green analytical chemistry introduction to chloropropanols determination at no economic and analytical performance costs?
- Renata Marcinkowska
- Aleksander Orłowski
- Jacek Namieśnik
- Marek Tobiszewski
2016 TALANTA.The International Journal of Pure and Applied Analytical Chemistry
In this study we perform ranking of analytical procedures for 3-monochloropopane-1,2-diol determination in soy sauces with PROMETHEE method. Multicriteria decision analysis was performed for three different scenarios – metrological, economic and environmental, by application different weights to decision making criteria. All three scenarios indicate capillary electrophoresis – based procedure as the most preferable. Apart from that the details of ranking results differ for these three scenarios. The second run of rankings was done for scenarios that include metrological, economic and environmental criteria only, neglecting others. These results show that green analytical chemistry – based selection correlates with economic, while there is no correlation with metrological ones. This is an implication that green analytical chemistry can be brought into laboratories without analytical performance costs and it is even supported by economic reasons.