2013 - Repozytorium publikacji - Politechnika Gdańska

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Publikacje z roku 2013

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Dawny browar cystersów oliwskich
- Aleksander Piwek
2013 Pełny tekst Architectus
W artykule przedstawiono dzieje browaru zakonnego od czasu jego powstania szacowanego na pocz. XIV w., aż po prawie całkowitą rozbiórkę w 1833 r. W rezultacie rozwarstwienia zachowanej partii budynku jak i dokumentacji z XIX w. ustalono trzy zasadnicze zmiany architektoniczne i funkcjonalne.
Decisional DNA and Optimization Problem
- Edward Szczerbicki
- Cesar Sanin
2013
Many researchers have proved that Decisional DNA (DDNA) and Set of Experience Knowledge Structure (SOEKS or SOE) is a technology capable of gathering information and converting it into knowledge to help decision-makers to make precise decisions in many ways. These techniques have a feature to combine with different tools, such as data mining techniques and web crawlers, helping organization collect information from different sources and using gathered knowledge to make decision or prediction. In this paper, our focus is on another research issue, optimization problem. Although there are many algorithms that have been design to solve this problem, it still lacks efficiency and effectiveness to get optimal solutions. Therefore, we propose a new structure combining the SOEKS with an evolutionary algorithm to find optimal solutions and to reuse this experience for efficient decision making support.
Decoherence-free communication over multiaccess quantum channels
- Maciej Demianowicz
2013 OPEN SYSTEMS & INFORMATION DYNAMICS
In this paper we consider decoherence-free communication over multiple access and k-user quantum channels. First, we concentrate on a hermitian unitary noise model U for a two-access bi-unitary channel and show that in this case a decoherence-free code exists if the space of Schmidt matrices of an eigensubspace of U exhibits certain properties of decomposability. Then, we show that our technique is also applicable for generic random unitary two-access channels. Finally, we consider the applicability of the result to the case of a larger number of senders and general Kraus operators.
Dedicated power supply subsystem for ultra-low noise preamplifiers
- Katarzyna Karpienko
- Łukasz Surażyński
- Paweł Wierzba
2013
In field of electronics there is need for low-noise amplifiers. Noise have the most important influence on analog circuits. Therefore exist necessity to develop new ultra-low noise power supplies, which can cooperate with specified amplifiers and preamplifiers. It is very common that professional power supplies are very expensive and still have disadvantages. This paper proposes simple and inexpensive solution, which fulfill specific criteria and can be treated as base for improve.
DEGRADATION OF GFRP MARINE LAMINATES WITH NANO PARTICLE MODIFIED COATINGS
- Michał Landowski
- Krystyna Imielińska
2013 Pełny tekst Advances in Materials Science
Water absorption and surface blistering behaviour was studied for polyester-matrix laminates with SiO2 nanoparticle reinforced gel coats. Accelerated water immersion tests at 37°C showed that addition of 10% nanoparticles increases blisters incubation time by ca. 50% compared to 5% and 0% nanoparticles composites.
Degradation of stiffness of building columns exposed to bending and impact load during ground motions
- Wojciech Migda
- Robert Jankowski
2013 Technology and Art
The safety of civil engineering structures under external loads, including ground motions, is one of the issues related to the idea of sustainable society. The earthquake-induced soft-storey failure is a typical type of damage observed in buildings due to seismic excitation. The failure of an intermediate soft storey of a structure results in large vertical impact loading acting on the lower floors due to the fall of the upper storeys. The aim of the paper is to show the results of the study focused on the behaviour of columns exposed to such extreme load conditions, including the influence of the degradation of horizontal stiffness of columns on the overall structural response. The results of the study indicate that the stiffness degradation of columns might have a substantial influence on the behaviour of a building leading to the increase in the structural response during ground motion. The results also show that the time of impact is really important indicating that the highest increase in the response can be expected when the impact takes place when the structure is in the range of its peak deformations.
Degradation of xylose using a microbial fuel cell
- Milena Alicja Jabłońska
- Maria Rybarczyk
- Marek Lieder
2013 Acta Biochimica Polonica
It is generally known, that many kind of microorganisms are capable of using carbohydrates as a source of carbon and energy in an environment. The biodegradation process of monosaccharides from pentoses (in this case- racemic mixture of D - and L – xylose) is an immense opportunity for an entire reduction of biological contamination to neutral compounds through MFC. The process is occurred in a single-chamber MFC, which is contained two indispensable components- an graphite felt anode with chemical and thermal modification and gas diffusion cathode. D-xylose is one of carbohydrates, which is the easiest digestible compound for microorganisms. In MFC, the reduction of the racemate of xylose is occurred quickly with visible final effects: an increase of the cell voltage, a reduction of fuel and a decomposition of fuel inter alia to volatile fatty acids. The degradation of the racemate (used monosaccharide) is resulted in a formation of acids such as acetic acid, propionic acid and also acids, which are created in fermentation process- butyric acid and iso-butyric acid. The quantity of those acids is determined by several analysis of known concentration of the dispensed fuel. As the result of the executed experiments is determination: the ranges of rising voltage, the amount of reduced fuel and the amount of VFAs, which are produced from the determined amount of racemate of xylose.
Dehydrogenaza sacharopiny (NADP+, tworząca L-glutaminian) z Candida albicans jako cel molekularny
- Kamila Rząd
2013
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Demonstrator technologii C-IED
- Sławomir Ambroziak
- Ryszard Katulski
- Jarosław Sadowski
- Jacek Stefański
2013 Pełny tekst Biuletyn Wojskowej Akademii Technicznej
Artykuł przedstawia budowę i działanie opracowanego na Politechnice Gdańskiej demonstratora technologicznego systemu AEGIS, przeznaczonego do przeciwdziałania atakom z wykorzystaniem prowizorycznych urządzeń wybuchowych detonowanych drogą radiową (RCIED — Radio Controlled Improvised Explosive Devices). Przedstawiono zaimplementowaną oryginalną metodę generowania sygnału zagłuszającego o dowolnie ukształtowanym widmie częstotliwościowym, będącą przedmiotem zgłoszenia patentowego o numerze P.398050.
Dendron to Central Core S1–S1 and S2–Sn (n>1) Energy Transfers in Artificial Special Pairs Containing Dendrimers with Limited Numbers of Conformations
- Pierre D. Harvey
- Frederique Bregier
- Shawkat M. Aly
- Jędrzej Szmytkowski
- Matthew Paige
- Ronald P. Steer
2013 CHEMISTRY-A EUROPEAN JOURNAL
Two dendrimers consisting of a cofacial free-base bisporphyrin held by a biphenylene spacer and functionalized with 4-benzeneoxomethane (5-(4-benzene)tri-10,15,20-(4-n-octylbenzene)zinc(II)porphyrin) using either five or six of the six available meso-positions, have been synthesized and characterized as models for the antenna effect in Photosystems I and II. The presence of the short linkers, -CH2O-, and long C8H17 soluble side chains substantially reduces the number of conformers (foldamers) compared with classic dendrimers built with longer flexible chains. This simplification assists in their spectroscopic and photophysical analysis, notably with respect to fluorescence resonance energy transfer (FRET). Both steady-state and time-resolved spectroscopic measurements indicate that the cofacial free bases and the flanking zinc(II)–porphyrin antennas act as energy acceptor and donor, respectively, following excitation in either the Q or Soret bands of the dendrimers. The rate constants for singlet electronic energy transfer (kEET) extracted from the S1 and S2 fluorescence lifetimes of the donor in the presence and absence of the acceptor are ≤ (0.1–0.3)×109 and ∼2×109 s−1 for S1→S1 (range from a bi-exponential decay model) and about 1.5×1012 s−1 for S2→Sn (n>1). Comparisons of these experimental data with those calculated from Förster theory using orientation factors and donor–acceptor distances extracted from computer modeling suggest that a highly restricted number of the many foldamers facilitate energy transfer. These foldamers have the lowest energy by molecular modeling and consist of one or at most two of the flanking zinc porphyrin antennas folded so they lie near the central artificial special pair core with the remaining antennas located almost parallel to and far from it.
Desensitization of glucosamine-6-phosphate synthase to inhibition by UDP-GlcNAc
- Karolina Kwiatkowska-Semrau
- Sławomir Milewski
- Agnieszka Napiórkowska
2013 Acta Biochimica Polonica
Glucosamine-6-phosphate (GlcN-6-P) synthase, known also as L-Glutamine: D-fructose-6-phosphate amidotransferase, catalyzes the first committed step in the pathway leading to the ultimate formation of UDP-GlcNAc. The final product of this pathway is an activated precursor of numerous macromolecules containing amino sugars, including chitin and mannproteins in fungi, peptidoglycan and lipopolysaccharides in bacteria, and glycoproteins in mammals. The reaction catalyzed by the enzyme is conversion of fructose-6-phosphate into glucosamine-6-phosphate with L-glutamine as a nitrogen donor. The important differences between prokaryotic and eukaryotic forms of the enzyme include a substantially larger size of the latter and sensitivity of the latter but not the former to the feedback inhibition by uridine 5’-diphospho-N-acetyl-D-glucosamine (UDP-GlcNAc). The enzyme has been proposed as a promising target in antifungal chemotherapy as well as for the treatment of insulin-independent diabetes mellitus. Our studies have been focused on GlcN-6-P synthase from human pathogenic fungi Candida albicans coded by the GFA1 gene. We were able to demonstrate a crystal structure of the isomerase domain (ISOM) of C. albicans GlcN-6-P synthase in complex with UDP-GlcNAc [2]. Now we report results of our further studies involving the site-directed mutagenesis of GFA1, leading to the following substitutions of amino acid residues located at the putative UDP-GlcNAc binding site in the gene products: Gly474Leu, Thr487Ile, Gly490Leu and His492Phe. Muteins obtaned at consecutive steps of mutagenesis were isolated and characterized. The final product of mutagenesis was completely insensitive to inhibition by UDP-GlcNAc, while sensitivities of the intermediate products were diminished. Conclusions concerning the probable role of UDP-GlcNAc binding for enzyme structure and catalytic properties are presented.
Design analysis of combined gas-vapour micro power plant with 30 kW air turbine
- Marian Piwowarski
- Krzysztof Kosowski
2013
The article presents basic results of the design analysis of a combined gas-vapour micro power plant with a waste-heat boiler without exhaust reheat, working in the vapour section in the Organic Rankine Cycle (ORC) system. The analysis concerned working media most frequently used in those types of power plants and planned to be used in future. The object of the analysis was a micro power plant with a 30 kW gas (air) turbine for which the low-boiling medium was selected in such a way as to obtain maximal possible power output of the vapour turbine and, consequently, the highest efficiency of the combined cycle. The analysis also included vapour micro power plants with heat regeneration for so-called dry media and cycles without heat regeneration for so-called wet media. The amount of thermal energy available for utilisation in the cogeneration micro power plant at the assumed condenser temperatures equal to 95ºC, 55ºC and 30ºC, respectively, was assessed. The most favourable medium in terms of the obtained power output and efficiency of the combined cycle was selected and the effect of the low-boiling medium on design parameters of the vapour micro turbine was assessed.
Design analysis of ORC micro-turbines making use of thermal energy of oceans
- Marian Piwowarski
2013 Pełny tekst Polish Maritime Research
The article presents the results of the analysis of energy conversion cycles making use of thermal energy of oceans. The objects of analysis were two cases of closed Organic Rankine Cycle (ORC) power plants, which were: the cycle in which the vapour of the working medium was produced by warm oceanic water in the circum-equatorial zone, and the so-called “arctic” cycle in which this vapour was produced by non-frozen water in the circumpolar zone. Between ten and twenty low-boiling media were examined for which operating parameters were optimised to obtain the highest cycle efficiency. A preliminary design of an ORC turbine which was obtained by optimising basic design parameters is included. It has been proved that realisation of the Ocean Thermal Energy Conversion (OTEC) cycle is possible both in the warm and permanently frozen regions. The results of the calculations have also revealed that the efficiency of the OTEC cycle is higher in the circumpolar zone. Selecting a low-boiling medium and designing a highly efficient turbine operating in both abovementioned regimes is technically realisable.
Design and Configuration of Context-aware VoIP Telephony Systems
- Sławomir Nasiadka
2013
Voice over IP is a widely used concept with regard to a realization technology of different types of telephony systems, including those that are used in enterprises. Such systems of a call procesing component and a set of desk endpoints that are pervasove from a user perspective. Those andpoints are usually not mobile, but in result can deliver a much greater set of functions needed in an everyday office work. Those functions also make VoIP telephony systems well suited for using a context information to adapt to the situations of their users. The paper presents an approach to designing such systems from a context-aware point of view and organizing a configuration of their objects. A sample deployment has been prepared and evaluated.
Design and distribution of air nozzles in the biomass boiler assembly
- Karol Ronewicz
- Tomasz Turzyński
- Dariusz Kardaś
2013 Transactions of the Institute of Fluid-Flow Machinery
Due to energy crisis as well as increasing pollution of the environment, renewable energy sources usage increases all over the world. These facts encouraged authors to start research over developing a uniform biomass boiler calculation model. This paper presents a design of biomass boiler assembly created for ORC (Organic Rankine Cycle) unit since these systems could achieve strong position in energy industry. To achieve optimal performance of boiler assembly, two additional devices have been designed – the economizer and air preheater. Such installation allows to reach the assembly efficiency of 82%. The paper also contains research over the air nozzles placement in the combustion chamber in order to ensure the best firebox efficiency. Calculations are based on CFD modeling of pyrolysis on the moving grate. Released gases are being transported to the combustion chamber, mixed with air from the nozzles and combusted. Furthermore, the model assumes different distribution and composition of gases across the moving grate.
Design and implementation principles of FIReWORK ONLINE - the VHDL autogenerator for hardware structures
- Robert Smyk
2013
The paper presents an aspects of remote autogeneration of hardware structures. The solution is an online application, that is running on the server side and allows to design a particular filters and other selected hardware and generate its structure in the form of VHDL, dedicated to FPGA design environments. The paper also addresses the problem of parameterization of algorithms used to generate the hardware structures and current developement state of the application.
Design and testing of a radial-axial microturbine for domestic applications
- Jarosław Mikielewicz
- Krzysztof Kosowski
- Dariusz Mikielewicz
- Robert Stępień
- Jan Wajs
2013
In the paper presented is a new design of the radial-axial microturbine of 3-4kW capacity for operation with ethanol as working fluid
Design, modelling and analysis of a new type of piezoelectric motor. Multicell piezoelectric motor
- Roland Ryndzionek
- Jean-Francois Rouchon
- Mieczysław Ronkowski
- Michał Michna
- Łukasz Sienkiewicz
2013
This paper describes a new type of piezoelectric motor. The results, obtained in the field of piezoelectric motors, have pointed out that these motors have potentially high possibilities in the future special applications. The research work presents the design, simulations and parameters of the piezoelectric motor with three rotation-mode actuators. The motor is characterized by a high power, relative high speed and torque. The motor consist of stator with few (minimum 3) rotating mode actuators. The purpose of those efforts was to develop a new actuator dedicated for the embedded applications.
Design of a Distributed System using Mobile Devices and Workflow Management for Measurement and Control of a Smart Home and Health
- Paweł Czarnul
2013
The paper presents design of a distributed system for measurements and control of a smart home including temper- atures, light, fire danger, health problems of inhabitants such as increased body temperature, a person falling etc. This is done by integration of mobile devices and standards, distributed service based middleware BeesyCluster and a workflow management system. Mobile devices are used to measure the parameters and are coupled with computers for remote access. The latter is made possible by exposing services in the distributed middleware. Such services can then be integrated into complex workflow applica- tions for constant monitoring and analysis of input data, instant feedback such as turning off lights or heating or notification of medical emergency. Interfaces are defined for particular system components and implementation hints for measurements using the Java Mobile Sensor JSR 256 API are provided.
Design, Realization and Measurements of Enhanced Performance 2.4 GHz ESPAR Antenna for Localization in Wireless Sensor Networks
- Mateusz Rzymowski
- Łukasz Kulas
2013
This paper presents the design, realization and measurements of an Electronically Steerable Parasitic Array Radiator (ESPAR) antenna with enhanced performance of estimating the incoming signal direction. Designed antenna is dedicated for 2.4 GHz ISM applications with emphasis on Wireless Sensor Networks (WSN). Proposed antenna provides different radiation patterns by proper configuration of the parasitic elements. Thus, several ways of estimation of the incoming signal direction are possible. Apart from using the main directional beam, an additional method that uses minima of the antenna directional pattern is proposed.