2013 - Repozytorium publikacji - Politechnika Gdańska

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Ekspertyza(1)
- Jacek Gębicki
2013
Ekspertyza dotycząca podtrzymania odwołania złożonego przez firmę EAS ENVIMET POLSKA Sp. z o.o. z siedzibą w Wieliczce, ul. Park Kingi 1 32-020 Wieliczka w Krajowej Izbie Odwoławczej przy Prezesie Urzędu Zamówień Publicznych, ul. Postępu 17a 02-676 Warszawa, wobec treści ogłoszenia o zamówieniu opublikowanym dnia 20 lipca 2013r. w Dzienniku Urzędowym Unii Europejskiej pod numerem 2013/S 140-243351 oraz wobec postanowień specyfikacji istotnych warunków zamówienia opublikowanych na stronie internetowej Zamawiającego na dostawę aparatury kontrolno-pomiarowej dla Wojewódzkiego Inspektoratu Ochrony Środowiska w Łodzi ul. Lipowa 16, 90-743 Łódź.
Ekspertyza(2)
- Jacek Gębicki
2013
Ekspertyza dotycząca odrzucenia odwołania złożonego przez firmę MLU Sp. z o.o. z siedzibą w Katowicach, ul. Połomińska 16 40-585 Katowice w Krajowej Izbie Odwoławczej przy Prezesie Urzędu Zamówień Publicznych, ul. Postępu 17a 02-676 Warszawa, wobec treści ogłoszenia o zamówieniu opublikowanym dnia 8 maja 2013r. w Dzienniku Urzędowym Unii Europejskiej pod numerem 151218-2013, dotyczącym postępowania o udzielenie zamówienia publicznego w trybie przetargu nieograniczonego na realizacje zamówienia pn.: "Zakup analizatorów do pomiarów zanieczyszczeń gazowych i kalibratorów do wzorcowania analizatorów" (sprawa ZP/DM/0811-04-EOG/01/2013/MZ).
Eksperymentalne i numeryczne badania parametrów dynamicznych trybuny stalowej
- Natalia Lasowicz
2013
Trybuny stalowe to konstrukcje, które odnajdują swoje zastosowanie głównie podczas wydarzeń sportowych, koncertów muzycznych oraz innych wydarzeń, którym towarzyszą rytmiczne aktywności widzów i głośna muzyka. Ze względu na smukłość oraz lekkość elementów z jakich wykonana jest konstrukcja trybuny jest ona bardzo łatwo wzbudzana przez ludzi do drgań. Z przeprowadzonej w pracy [4] analizy modalnej wynika, że masa ludzi prowadzi do redukcji wartości częstości drgań własnych konstrukcji. Poza obciążeniami statycznymi należy uwzględnić obecność obciążeń dynamiczne, które są kluczowe w projektowaniu trybun stalowych. Celem artykułu było porównanie wyników badania parametrów dynamicznych trybuny stalowej, na drodze eksperymentalnej i numerycznej.
EKSTRAKCJA ANALITÓW Z PRÓBKI ZMIESZANEJ Z OBOJĘTNYM WYPEŁNIACZEM (MSPD)
- Marta Wasielewska
- Anna Banel
- Bogdan Zygmunt
2013 Analityka: Nauka i Praktyka
Technika ekstrakcji analitów z próbki zmieszanej z obojętnym wypełniaczem (MSPD) znajduje coraz szersze zastosowanie jako technika jednoczesnego przygotowania, ekstrakcji, frakcjonowania i oczyszczania ekstraktów z próbek stałych, pół-stałych i lepkich. Najczęściej używana jest do przygotowania próbek środowiskowych, biologicznych oraz żywności zarówno w celu ekstrakcji naturalnie występujących związków, jak i zanieczyszczeń organicznych w tym pozostałości farmaceutyków. Ze względu na wysoką selektywność, dużą elastyczność, niskie zużycie rozpuszczalników i całkiem krótki czas technika ta jest konkurencyjna w stosunku do klasycznych technik przygotowania próbek do analizy.
Ekstrakcja z wykorzystaniem ruchomego elementu sorpcyjnegp (SBSE)
- Paulina Biernacka
- Waldemar Wardencki
- Jacek Namieśnik
2013 Analityka: Nauka i Praktyka
W artykule scharakteryzowano technikę ekstrakcji z wykorzystaniem ruchomego elementu sorpcyjnego oraz podano przykłady zastosowań w odniesieniu do różnych matryc i analitów
Elastic distortional buckling of thin-walled bars of closed quadratic cross-section
- Marcin Kujawa
- Czesław Szymczak
2013 Pełny tekst Mechanics and Mechanical Engineering
In this study a tin-walled bar with closed quadratic cross-section is considered. The elastic stability of axially compressed bar related to the cross-section distortion is investigated. The governing differential equatio is derived with aid of the principle of stationary potential energy. The critical load for simply supported bar is found in an analytical form and it is copared with the FEM solution. Sufficient accuracy of the results is worth of noticing.
ELASTYCZNE NANOKOMPOZYTOWE PIANKI POLIURETANOWE
- Łukasz Piszczyk
- Magdalena Danowska
- Magdalena Formela
- Krzysztof Formela
2013
Przedmiotem badań były elastyczne pianki poliuretanowe modyfikowane nanonapełniaczem z grupy glinokrzemianów warstwowych oraz fosforoorganicznym związkiem zmniejszającym palność. Zbadano wpływ tych napełniaczy na zmiany właściwości fizycznych, mechanicznych oraz palność otrzymanych układów.
Elctrochemical oxidation and corrosion resistance of the Ti13Nb13Zr alloy
- Agnieszka Ossowska
- Andrzej Zieliński
- Milena Supernak-Marczewska
2013 Engineering of Biomaterials / Inżynieria Biomateriałów
This paper presents the results of oxidation and corrosion tests carried out on titanium alloy Ti13Nb13Zr. The oxide film was prepared by electrochemical environment 2M H3PO4 for 30 min and 1 h, at a constant voltage 40V. The tests of corrosion resistance were performed by potentiostatic method in Ringer's solution at different pH values: 7, 5 and 3. The change in an appearance of surface and the increase in corrosion resistance even in an acidic environment is an evidence that the electrochemical treatment of the Ti13Nb13Zr alloy results in formation of dense, compact and likely amorphous oxide layer.
E-Learning Service Management System For Migration Towards Future Internet Architectures
- Krzysztof Gierłowski
2013 Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne
As access to knowledge and continuous learning are among the most valuable assets in modern, technological society, it is hardly surprising that e-learning solutions can be counted amongst the most important groups of services being deployed in modern network systems. Based on analysis of their current state-of-the-art, we decided to concentrate our research and development work on designing and implementing a management system aimed to provide an easy management of diverse set of external didactic services in wide-ranging connectivity scenarios. Such approach (opposed to popular commercial trend of providing tightly integrated and difficult to extend sets of proprietary applications), combined with loosely-tied distributed architecture, makes it possible to both effectively integrate varied e-Learning products and seamlessly move to new organizational structures. Moreover, an ability to maintain its functionality in diverse network conditions by adjusting the communication methods employed, makes the proposed system a valuable migration platform for e-Learning services, allowing them to be easily deployed in new and still poorly defined network environment of Future Internet.
Electrical mapping of AISI 304 stainless steel subjected to intergranular corrosion performed by means of AFM-LIS in the contact mode
- Anna Arutunow
- Kazimierz Darowicki
- Mateusz Tobiszewski
2013 CORROSION SCIENCE
The paper presents results of the AFM-based approach to local impedance spectroscopy (LIS) measurements performed in a 20 20 lm grid within an austenite grain–grain boundary region for sensitized AISI 304 stainless steel (SS). Maps of electrical parameters obtained on the basis of localized impedance spectra were demonstrated, presenting their changes and correlation with the sample topography. Performed research revealed significant differences in the electrical distribution of the contact resistance considered as the passive layer resistance and contact capacitance considered as the passive layer capacitance determined for austenite grain interiors and austenite grain boundaries affected by intergranular corrosion.
Electrical properties of hybrid planar diode based on palladium phthalocyanine and titanium dioxide
- Grażyna Jarosz
- Barbara Kościelska
- Ryszard Signerski
2013 Pełny tekst MATERIALS SCIENCE-POLAND
This work details experimental studies of a planar diode made of indium tin oxide/titanium dioxide/palladium phthalocyanine/gold. The rectification ratio of current was 105 at 1.5 V. The analysis of the electrical properties of the system was based on small signal complex capacitance spectra measured in the frequency range of 25 Hz-1 MHz at different values of bias. No depletion region at the TiO2/PdPc interface was observed. Forward bias specifically affected both parts of the complex capacitance and the observed effect probably resulted from the rearrangement of charge carriers injected into the organic layer.
Electrochemical investigations on the corrosion behaviour of reinforcing steel in diatomite- and zeolite-containing concrete exposed to sulphuric acid
- Husnu Gerengi
- Agata Jażdżewska
2013 CONSTRUCTION AND BUILDING MATERIALS
Corrosion is a major concern for most structural applications. Its detrimental effect significantly reduces the life of metallic components. This paper presents the results of an experimental investigation of corrosion in the steel reinforcement of concrete samples having three different substituents: 20% diatomite, 20% zeolite, and a reference without zeolite or diatomite. All concrete specimens were subjected to a solution of 0.5 M H2SO4 for 160 days, and every 15 days electrochemical impedance spectroscopy (EIS) measurements were performed. The results indicated that porosity plays a very important role in reinforcing concrete. The steel reinforcement in the zeolite was less corroded by the H2SO4 solution than the reference and the diatomite samples.
Electrochemical oxidation of sulphamerazine at boron-doped diamond electrodes: Inﬂuence of boron concentration
- Aleksandra Fabiańska
- Robert Bogdanowicz
- Patrycja Zięba
- Tadeusz Ossowski
- Marcin Gnyba
- Jacek Ryl
- Artur Zieliński
- Stoffel D. Janssens
- Ken Haenen
- E.m. Siedlecka
2013 PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
The boron-doped diamond (BDD) electrodes with different boron concentrations have been tested as electrode material for sulphamerazine (SRM) oxidation in water solution. An investigation of the electrode morphology and molecular structure was carried out using high resolution scanning electron microscopy (SEM) and Raman spectroscopy. Electrochemical results showed clearly that the kinetics and efficiency of SRM oxidation were dependent on the amount of boron incorporated in a diamond film. The mechanism of SRM oxidation was also analysed by cycle voltammograms and by identyfying oxidative species which take part in the degradation process. Te aging of the material during the operation was also studied.
Electrohydrodynamic flow patterns and collection efficiency in narrow wire-cylinder type electrostatic precipitator
- Anna Niewulis
- Artur Berendt
- J. Podliński
- Jerzy Mizeraczyk
2013 JOURNAL OF ELECTROSTATICS
Recently, narrow electrostatic precipitators (ESPs) have become a subject of interest because of their possible application for the cleaning of the exhaust gases emitted by diesel engines. Diesel engines emit fine particles, which are harmful to human and animal health. There are several methods for decrease particulate emission from a diesel engines, but up to now, these methods are not enough effective or very expensive. Therefore, an electrostatic precipitation was proposed as an alternative method for control of a diesel particulate emission. In this work, results of electrohydrodynamic (EHD) secondary flow and particle collection efficiency measurements in a narrow wire-cylinder type ESP are presented. The ESP was a glass cylinder (300 mm × 29 mm) equipped with a wire discharge electrode and two collecting cylinder-electrodes. A 0.23 mm in diameter and 100 mm long stainless-steel discharge wire electrode was mounted in the center of the cylinder, parallel to the main flow direction. The collecting electrodes were made of stainless steel cylinders, each with a length of 100 mm and inner diameter of 25.5 mm. An air flow seeded with a cigarette smoke was blown along the ESP duct with an average velocity of 0.9 m/s. The EHD secondary flow was measured using 2-dimensional particle image velocimetry (PIV) method. The PIV measurements were carried out in the wire electrode mid-plane, perpendicularly to the wire and the collecting electrodes. The results show similarities and differences of the particle flow in the wire-cylinder type ESP for a negative and a positive DC voltage polarity. The collection efficiency was calculated from the fractional particle concentration. The fractional particle concentration was measured using the optical aerosol spectrometer. The results of the fractional collection efficiency confirmed the common view that the collection efficiency of fine particles in the ESP increases with increasing voltage and it is higher for negative voltage polarity and decreases when decreasing particle diameter.
Electrohydrodynamic secondary flow and particle collection efficiency in spike-plate multi-electrode electrostatic precipitator
- J. Podliński
- Artur Berendt
- Jerzy Mizeraczyk
2013 IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
In this work the results of electrohydrodynamic (EHD) secondary flow measurements in a spike-plate type electrostatic precipitator (ESP) are presented. In the investigated ESP two-sided and one-sided spike electrodes were used as a discharge electrodes. The results of 2D PIV measurements showed that flow pattern obtained for a different spike tips positions in respect to the primary flow direction significantly changing the flow structures in the ESP duct. The submicron dust particles collection measurements in this ESP were also performed. The obtained results showed that the collection efficiency of submicron dust particles depends on the generated EHD secondary flow.
Electromagnetic Problems Requiring High-Precision Computations
- Tomasz Stefański
2013 IEEE ANTENNAS AND PROPAGATION MAGAZINE
An overview of the applications of multiple-precision arithmetic in CEM was presented in this paper for the first time. Although double-precision floating-point arithmetic is sufficient for most scientific computations, there is an expanding body of electromagnetic problems requiring multiple-precision arithmetic. Software libraries facilitating these computations were described, and investigations requiring multiple-precision arithmetic were presented. In particular, numerical-precision issues were demonstrated based on the example of the discrete Green's function. Finally, some open problems in electromagnetics were pointed out for further investigations.
Electromodulation of monomer and excimer phosphorescence in vacuum-evaporated films of platinum (II) complexes of 1,3-di(2-pyridyl)benzenes
- Wojciech Mróz
- Karol Falkowski
- Maciej Miśnik
- Ester Rossi
- Marcella Balordi
- Waldemar Stampor
2013 ORGANIC ELECTRONICS
Electric field-modulated photoluminescence (EML) measurements are presented for vacuum-evaporated films of cyclometallated Pt (II) complexes of 1,3-di(2-pyridyl) benzenes used as triplet emitters in organic light-emitting diodes (OLEDs). The excimer phosphorescence is quenched by the external electric field of 2.5 MV/cm up to 25% but the same effect on monomer phosphorescence is one order of magnitude smaller. The higher quenching effect for triplet excimers than triplet monomers in solid films of Pt complexes is rationalized assuming excimers to be populated within excimer-active domains of the films through an intermediate stage of geminate (e–h) pairs derived from dissociated monomer excitons. The EML data for excimers are successfully described in the framework of Sano–Tachiya–Noolandi–Hong (STNH) theory of geminate (e–h) pair recombination where the final recombination step (e–h capture) proceeds on a sphere of finite radius (a) with a finite speed. The conventional Onsager theory (a = 0) is sufficient to explain the EML quenching effect for monomers. The results are important for explaining the decrease of electroluminescence quantum efficiency observed in OLEDs working under high electric fields.
Electromodulation of photoluminescence in vacuum-evaporated films of bathocuproine
- Maciej Miśnik
- Karol Falkowski
- Wojciech Mróz
- Waldemar Stampor
2013 CHEMICAL PHYSICS
Electric field-modulated photoluminescence (EML) was measured in vacuum-evaporated films of bathocuproine (BCP), electron-transporting material commonly used in organic light-emitting diodes (OLEDs). The external electric field of 106 V/cm strength decreases long-wavelength photoluminescence (PL) up to 10% but the same effect on short-wavelength PL is above one order of magnitude smaller. The distinctive difference between the EML characteristics for the short-wavelength (mono-molecular) and long-wavelength (associative species) emission of BCP films is a result of the different nature of relevant emissive states. Absorption, PL, EML and atomic force microscopy (AFM) measurements can be consistently explained assuming existence of dimer species in solid BCP with their population increasing during aging process of the films. Besides ground state absorption dimer states are assumed to be populated indirectly from molecular (Frenkel type) excitons diffusing to defected domains of the films where dissociate through an intermediate stage of geminate (e–h) pairs. The EML data are analyzed applying various models of (e–h) pair dissociation based on Poole–Frenkel, Braun, Onsager and Sano-Tachiya-Noolandi-Hong (STNH) theories. The Onsager theory explains satisfactorily the observed EML quenching effect for dimer-type PL. The Stark effect on fluorescence quantum yield should be possibly invoked to explain the EML characteristics of monomolecular emission of BCP.
Electron scattering cross sections for 1-pentene, H2C=CH-(CH2)2CH3, molecules
- Czesław Szmytkowski
- Paweł Możejko
- Mateusz Zawadzki
- Elżbieta Ptasińska-Denga
2013 JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Cross sections, both experimental and theoretical, are reported for electron scattering from 1-pentene (C5H10) molecules. Absolute grand-total cross sections (TCSs) were measured at electron impact energies ranging from 1 to 300 eV, using a linear electron-transmission technique. The dominant behaviour of the experimental TCS energy function is a distinct asymmetric enhancement with the maximum located around 6.5 eV. Discernible are also three weak TCS structures: a small peak in the vicinity of 1.8 eV and two broad shoulders located between 10 and 30 eV. The additivity rule was employed to calculate the elastic cross section (ECS) from 20 to 3000 eV, while the binary-encounter-Bethe approach was used for the computation of the ionization cross section (ICS), from the threshold up to 3000 eV. Within 30 and 300 eV, the sum of computed cross sections (ECS+ICS) quite reasonably reproduces the experimental TCS values. Comparison is also made between the experimental TCS energy curve for 1-pentene (H2C=CH–(CH2)2CH3) and those measured for the ethylene (H2C=CH2) molecule and its substituted derivatives: propene (H2C=CH–CH3) and 1-butene (H2C=CH–CH2CH3).
Elektrolity stosowane w tlenkowych ogniwach paliwowych
- Paweł Gdaniec
2013
Tlenkowe ogniwa paliwowe są jednym z obiecujących kandydatów na nowe źródło energii przyszłości. Dzięki wysokiej wydajności układów kogeneracji energii elektrycznej i cieplnej sięgającej 85% mają potencjał aby dużo efektywniej wykorzystywać paliwo obecnie stosowane w energetyce. Jednakże aby aplikacja na szerszą skalę była możliwa konieczne jest zoptymalizowanie parametrów pracy tych ogniw. Jednym z głównych elementów ogniwa SOFC jest tlenkowy elektrolit. Prowadzone są wciąż badania, które na celu mają wybór związku chemicznego, który najlepiej sprawdzi się w tej roli. Niniejsza praca przedstawia przegląd materiałów elektrolitycznych wraz z krótką analizą parametrów jakimi się charakteryzują.