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Search results for: PROF. STANISŁAW BUTNICKI
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Wpływ miejsca uderzenia w stalową barierę ochronną oraz uwarstwienia gruntu na wartość parametru ASI podczas testu TB11
PublicationBariery stalowe są najczęściej stosowanym rodzajem barier ochronnych. Ich podstawowym zadaniem jest zapobieganie zjechaniu pojazdu z drogi w miejscach szczególnie niebezpiecznych. Bariery stosowane na europejskich drogach muszą spełniać wymagania norm EN 1317. Jednym z najważniejszych parametrów pozwalających klasyfikować bariery ochronne pod kątem zapewnienia stopnia bezpieczeństwa w trakcie incydentu jest wskaźnik intensywności...
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Role of MnO in manganese–borate binary glass systems: a study on structure and thermal properties
PublicationStructural and thermal properties of x MnO−(100−x)B2O3 (where x=40, 50 and 60 mol%) glass samples have been investigated with the employment of various techniques. Fourier transform infrared spectroscopy results revealed the influence of MnO on glass matrix. Decrease of B–O bond-related band intensities has been observed. MnO addition was found to introduce broken [BO2O−]n chains. Differential scanning calorimetry (DSC) measurements...
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Computer-aided analysis of resonance risk in power system with Static Var Compensators
PublicationStatic Var Compensators operation in a power system may significantly improve voltage profiles in nodes and the reactive power balance, as well as ensure greater system stability in emergency conditions. However these devices may be a cause of a resonance in the system. The aim of this paper is to call attention to the need to include resonance phenomena in a compensator’s location evaluation process. The analysis performed in...
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Badania numeryczne zderzenia autobusu w układzie bariera i kratownicowa konstrukcja wsporcza
PublicationZdarzenia spowodowane wypadnięciem pojazdu z trasy stanowią 20 – 30 % ogółu zdarzeń niebezpiecznych na drogach. Najczęściej występującymi przeszkodami i niebezpiecznymi obiektami przy drodze, w które uderza wypadający z niej pojazd są: bariery na autostradach i drogach ekspresowych oraz drzewa, słupy i znaki drogowe na innych szlakach. Do opracowania metody projektowania, tj. doboru lokalizacji i rodzaju urządzeń bezpieczeństwa...
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Degradable poly(ester-ether) urethanes of improved surface calcium deposition developed as novel biomaterials
PublicationBones, which are considered as hard tissues, work as scaffold for human body. They provide physical support for muscles and protect intestinal organs. Percentage of hard tissues in human body depends on age, weight, and gender. Human skeleton consists of 206 connected bones. Therefore, it is natural that the hard-tissue damage such as fractures, osteoporosis, and congenital lack of bone may appear. The innovative way of bone healing...
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Influence of Selected Saccharides on the Precipitation of Calcium-Vaterite Mixtures by the CO2 Bubbling Method
PublicationCalcium carbonate is a compound existing in living organisms and produced for many biomedical applications. In this work, calcium carbonate was synthesized by a CO2 bubbling method using ammonia as a CO2 absorption promotor. Glucose, fructose, sucrose, and trehalose were added into the reaction mixture to modify characteristics of precipitated calcium carbonate particles. To determine the polymorphic form of produced calcium carbonate...
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Recent Achievements in Constitutive Equations of Laminates and Functionally Graded Structures Formulated in the Resultant Nonlinear Shell Theory
PublicationThe development of constitutive equations formulated in the resultant nonlinear shell theory is presented. The specific features of the present shell theory are drilling rotation naturally included in the formulation and asymmetric measures of strains and stress resultants. The special attention in the chapter is given to recent achievements: progressive failure analysis of laminated shells and elastoplastic constitutive relation...
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LS-DYNA simulations of the impacts of a 38-ton Heavy Goods Vehicle into a road cable barrier
PublicationNowadays, more and more attention is being paid to safety on roads and motorways. It is due to the continuous development of road and motorway network and a significant increase of the number of vehicles on roads. To meet the expectations of improving road safety in Poland, the Road Innovations Development (RID) research programme was implemented in 2016. The aim of the RID 3A - Road Safety Equipment (RoSE) project is a comprehensive...
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Influence of Shunt Compensation with SVC Devices on Resonance Risk in Power Systems
PublicationMany analyses are required to locate a new reactive power source in a power system. The choice of a location is a very complex matter which requires various aspects to be considered. Selecting a location also entails the necessity to assess it from the point of view of the selected compensator’s structure as well as the system’s performance in various states with the new device on. The paper presents the issues of assessing compensator...
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Symulacje numeryczne jako wsparcie badania właściwości barier ochronnych
PublicationArtykuł przedstawia możliwości wykorzystania symulacji numerycznych do badań efektywności urządzeń bezpieczeństwa ruchu drogowego w aspekcie sposobów ich konfgurowania. Obecnie w celu dopuszczenia do stosowania bariery ochronne muszą przejść specjalistyczne testy zderzeniowe. Ze względu na wysoki koszt tych badań coraz częściej producenci barier oraz inne podmioty odpowiadające za urządzenia bezpieczeństwa ruchu drogowego (brd)...
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SAMOCHÓD SPORTOWY DUOMOTO NAPĘDZANY DWOMA SILNIKAMI SPALINOWYMI
PublicationPrzedstawiono zaprojektowany i zbudowany przez zespół czterech dyplomantów Wydziału Mechanicznego Politechniki Gdańskiej samochód sportowy napędzany dwoma silnikami. Jeden z nich umieszczono z przodu pojazdu. Przekazuje on moment obrotowy na koła osi przedniej poprzez zespolony układ napędowy. Drugi silnik, usytuowany ztyłu pojazdu, w identyczny sposób przekazuje moment napędowy na koła osi tylnej....
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A High-Efficient Measurement System With Optimization Feature for Prototype CMOS Image Sensors
PublicationIn this paper, a gray-scale CMOS image sensor (CIS) characterization system with an optimization feature has been proposed. By using a very fast and precise control of light intensity, based on the pulsewidth-modulation method, it is avoided to measure the illuminance every time. These features accelerate the multicriteria CIS optimization requiring many thousands of measurements. The system throughput is 2.5 Gb/s, which allows...
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The influence of position of the post or its absence on the performance of the cable barrier system
PublicationRoad safety barriers are used to increase safety in potentially dangerous places on the roads. They are designed and installed on the roads to prevent any vehicle from getting outside the travelled way or from entering the opposite lane of the road. Barriers, which are used on European roads, have to undergo full scale crash tests according to the EN 1317 standards. Nowadays as a supplement to real crash tests, numerical simulations...
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Environmental characteristics of a tundra river system in Svalbard. Part 2: Chemical stress factors
PublicationBacterial communities in the Arctic environment are subject to multiple stress factors, including contaminants, although typically their concentrations are small. The Arctic contamination research has focused on persistent organic pollutants (POPs) because they are bioaccumulative, resistant to degradation and toxic for all organisms. Pollutants have entered the Arctic predominantly by atmospheric and oceanic long-range transport,...
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Symulacje numeryczne testów zderzeniowych barier ochronnych
PublicationW pracy przedstawiono metodykę budowy modelu obliczeniowego ukierunkowanego na badania zderzeniowe w środowisku Metody Elementów Skończonych. Opisano etapy tworzenia takiego modelu, jego modyfkacji oraz sprawdzania poprawności przeprowadzonej symulacji, a także przedstawiono kilka autorskich przykładów zastosowania proponowanych obliczeń do badania barier ochronnych
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BADANIA NUMERYCZNE ZDERZENIA AUTOBUSU W UKŁADZIE BARIERA I KRATOWNICOWA KONSTRUKCJA WSPORCZA
PublicationZdarzenia spowodowane wypadnięciem pojazdu z trasy stanowią 20 – 30 % ogółu zdarzeń niebezpiecznych na drogach. Najczęściej występującymi przeszkodami i niebezpiecznymi obiektami przy drodze, w które uderza wypadający z niej pojazd są: bariery na autostradach i drogach ekspresowych oraz drzewa, słupy i znaki drogowe na innych szlakach. Do opracowania metody projektowania, tj. doboru lokalizacji i rodzaju urządzeń bezpieczeństwa...
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Widening of the electroactivity potential range by composite formation – capacitive properties of TiO2/BiVO4/PEDOT:PSS electrodes in contact with an aqueous electrolyte
PublicationComposites based on the titania nanotubes were tested in aqueous electrolyte as a potential electrode material for energy storage devices. The nanotubular morphology of TiO2 was obtained by Ti anodization. TiO2 nanotubes were covered by a thin layer of bismuth vanadate using pulsed laser deposition. The formation of the TiO2/BiVO4 junction leads to enhancement of pseudocapacitance in the cathodic potential range. The third component,...
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Fully scalable one-pot method for the production of phosphonic graphene derivatives
PublicationGraphene oxide was functionalized with simultaneous reduction to produce phosphonated reduced graphene oxide in a novel, fully scalable, one-pot method. The phosphonic derivative of graphene was obtained through the reaction of graphene oxide with phosphorus trichloride in water. The newly synthesized reduced graphene oxide derivative was fully characterized by using spectroscopic methods along with thermal analysis. The morphology...
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Corrosion today
PublicationOmówiono problemy korozyjne oraz warunki współpracy międzynarodowej z uwzględnieniem osiągnieć prof. S. Mroweca, prof. K. Kurzydłowskiego i prof. J. Flisa.
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Investigation of a Stirling engine as a micro-CHP system
PublicationW pracy przedstawiono przegląd konstrukcji silników Stirlinga, które mogą być stosowane w układach mikro-kogeneracyjnych. Zaprezentowano również wyniki badań silnika Stirlinga przeprowadzonych przy różnych obciążeniach cieplnych i elektrycznych układu.
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On constitutive relations in the resultatnt non-linear theory of shells
PublicationThe authors summarize their current research in the field of constitutive modelling in the framework of non-linear 6-parameter shell theory. In particular the description of isotropic, multilayered composite and functionally graded shells is presented.
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Influence of selected CO2 absorption promoters on the characteristics of calcium carbonate particles produced by carbonation of the post-distillation liquid from the Solvay process
PublicationThe aim of this work is to compare the effect of selected process parameters, gas flow rate, CO2 absorption promoter concentration and its pKa, on the precipitation of CaCO3 by the gas-liquid method using a model post-distillation liquid from the Solvay process. To ensure effective capture of CO2, the absorption promoters used were ammonia, triethanolamine and triethylamine. The Box-Behnken Design was applied to plan the experiments....
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Crystalline Silicon (c-Si)-Based Tunnel Oxide Passivated Contact (TOPCon) Solar Cells: A Review
PublicationContact selectivity is a key parameter for enhancing and improving the power conversion efficiency (PCE) of crystalline silicon (c-Si)-based solar cells. Carrier selective contacts (CSC) are the key technology which has the potential to achieve a higher PCE for c-Si-based solar cells closer to their theoretical efficiency limit. A recent and state-of-the-art approach in this domain is the tunnel oxide passivated contact (TOPCon)...
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On design and analysis of flow characteristics of the last stage of gas-steam turbine
PublicationResearch regarding blade design and analysis of flow have been conducted for over a century. Meanwhile new concepts and design approaches were created and improved. Advancements in information technologies allowed to introduce computational fluid dynamics (CFD) and computational flow mechanics (CFM). Currently a combination of mentioned methods is used for design of turbine blades. These methods enabled us to improve flow efficiency...
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Przegląd systemów mieszania cieczy fermentacyjnej stosowanych w biogazowniach
PublicationWraz z rozwojem sektora energetyki odnawialnej w Polsce, obserwowany jest wzrost produkcji i wykorzystania biogazu. Aktualna sytuacja na rynku odnawialnych źródeł energii oraz planowane zmiany w prawodawstwie, pozwalają przypuszczać, że w najbliższych latach, na terenie naszego kraju powstaną kolejne instalacje biogazowe. Należy jednak pamiętać, że jedną z najważniejszych decyzji na etapie planowania inwestycji biogazowej jest...
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Simulations of air and water flow in a model dike during overflow experiments
PublicationFlow in flood dikes, earth dams, and embankments occurs in variably saturated conditions, with pores of the earth material filled partly with water and partly with air. In routine engineering analysis, the influence of pore air is neglected and the air pressure is assumed equal to atmospheric. In some circumstances, for example, during overtopping of the dike by water, the effect of pore air on water flow and stability of the structure...
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Polnische Vertreter des Stahlbaus.
PublicationPodano rozszerzone notki biograficzne trzech wybitnych naukowców polskich - prof. Feliksa Jasińskiego, prof. Maksymiliana Tytusa Hubera, prof. Stefana Bryły oraz znakomitego konstruktora mostów - Polaka działającego w USA Rudolfa (Ralpha) Modrzejewskiego (Modejskiego).
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Analiza czasowa pasywnych układów mikrofalowych o dużej dobroci.**2003, 186s. 72 rys. maszyn. Rozprawa doktorska /15.04.2003./ Wydz. ETI Promotor: prof. dr hab. inż. M. Mrozowski.
PublicationCelem niniejszej pracy było zaproponowanie szeregu kryteriów pozwalającychna automatyczne tworzenie dużej wiarygodności modeli sygnałów, uzyskiwanychza pośrednictwem metod analizy układów mikrofalowych w dziedzinie czasu, jakrównież opracowanie definicji funkcji celu umożliwiających projektowaniefiltrów pasmowo-przepustowych w oparciu o analizę układów metodą FD-TD orazwykazanie skuteczności techniki automatycznej kreacji...
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The influence of nanostructures size on V2O5 electrochemical properties as cathode materials for lithium ion battery
PublicationIn this paper, V2O5 nanostructures with a size depending on the annealing temperature are successfully synthesized by a sol-gel method. The crystal structure and morphology of samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), selected area electron diffraction (SEAD) and scanning electron microscopy (SEM), respectively. Electrochemical testing such...
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Krajowe Sympozjum Telekomunikacji KST 2005
PublicationPrzedstawiono nowa strukturę organizacyjną Krajowego Sympozjum Telekomunikacji. Zaprezentowano Komitet Sterujący i programowy KST. Dla Krajowego Sympozjum KST/2005 uzgodniono Sesje Plenarne, na których zaprezentowano referaty prof. A. Dobrogowskiego, prof. J. Woźniaka, prof. A. Zabłudowskiego i k. Nowak. Zorganizowano również sesje specjalne.
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Structural and luminescent study of TeO2-BaO-Bi2O3-Ag glass system doped with Eu3+ and Dy3+ for possible color-tunable phosphor application
PublicationTellurite glass systems of 73TeO2-4BaO-3Bi2O3-1Ag:xEu2O3-(2-x)Dy2O3 (where x = 0.5, 1, 1.5, 2 in molar ratio) composition have been successfully synthesized. In order to acquire Ag nanoparticles, materials have been heat treated at 350 °C in the air atmosphere. Structural properties of obtained samples were evaluated with various techniques. X-Ray Diffraction (XRD) measurements indicated that obtained materials are amorphous in...
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Możliwości i zasady stosowania hybrydowych urządzeń energochłonnych na przykładzie urządzenia SafeEnd
PublicationOd kilku lat na świecie stosowane są urządzenia energochłonne spełniające rolę poduszki zderzeniowej oraz terminala energochłonnego. Urządzenia te stosowane są do osłony zakończeń barier drogowych oraz osłony obiektów znaj-dujących się w strefie bezpieczeństwa drogi. Przykładem takiego urządzenia jest urządzenie energochłonne U-15a SafeEnd (SE) stosowane od niedawna w Polsce, jednakże niektórzy zarządcy dróg zgłaszają obawy do...
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Innovative Research Into Road Restraint Systems
PublicationKey to understanding the needs and building road infrastructure management tools to prevent and mitigate run-off-road accidents is to identify hazards and their sources which are a result of wrong design, construction, installation and maintenance of road restraint systems [1]. Building such tools requires advanced studies with field tests, simulations and models to demonstrate the effects of selected parameters on road user safety...
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Structure and thermoelectric properties of bismuth telluride—Carbon composites
PublicationCarbon nanotubes and amorphous carbon have been introduced into a bismuth telluride matrix (0.15 and 0.30 wt.% ratio) to investigate the influence of the carbon on the composite’s thermoelectric properties. Composites with well-dispersed additives have been obtained by sonication and ball-milling methodology. Carbon nanotubes and an amorphous carbon addition led to a decrease in electric conductivity from 1120 S/cm to 77 S/cm....
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Bis-phosphonated carbon nanotubes: one pot synthesis and their application as efficient adsorbent of mercury
PublicationEffective, one-pot method of CNTs phosphonylation is presented. Cheap and readily available reagents are used, so the process can be easily transferred to large-scale production. The product was analyzed using spectroscopic methods (FTIR, UV-vis, XPS). Thermal properties of the bis-phosphonated nanotubes are reported for the first time. Newly obtained material was tested as an adsorbent for mercury removal from water. The sorption...
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UV-Vis-Induced Degradation of Phenol over Magnetic Photocatalysts Modified with Pt, Pd, Cu and Au Nanoparticles
PublicationThe combination of TiO2 photocatalyst and magnetic oxide nanoparticles enhances the separation and recoverable properties of nanosized TiO2 photocatalyst. Metal-modified (Me = Pd, Au, Pt, Cu) TiO2/SiO2@Fe3O4 nanocomposites were prepared by an ultrasonic-assisted sol-gel method. All prepared samples were characterized by X-ray powder diffraction (XRD) analysis, Brunauer-Emmett-Teller (BET) method, X-ray photoelectron spectroscopy...
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The influence of thermal conditions on V2O5 nanostructures prepared by sol-gel method
PublicationThis work presents the result of structure investigations ofV 2O5 nanorods grown from thin films and powders prepared by sol-gel method. To examine the best temperature of nanorods crystallization, thin films deposited by spin-coating method on quartz glass or silicon substrates and bulk xerogel powders were annealed at various temperatures ranging from 100∘C to 600∘C. The structure of the samples was characterized by X-ray diffraction...
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Experimental and numerical analysis of the modified TB32 crash tests of the cable barrier system
PublicationRoad restraint systems, including safety barriers, are one of the means used to improve road safety. Currently, they can be allowed to general use after passing the specific crash tests. However, it is always important and desirable to evaluate their performance under various realistic conditions, which can happen on the roads. In this study, the behaviour of the cable barrier system in impact conditions different than assumed...
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Energy losses reduction in the medium voltage cable line – case study
PublicationThe paper presents an analysis of energy losses in a power cable system, which is composed of two 30 kV cable lines. This cable system is located at the seaside holiday area, so the load profile during a year is specific. Energy losses related to reactive power transmission, as well as to currents induced in the sheaths of the cables, are subject to analysis. Measurements were made in the system in order to prepare a computer model...
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Au–Si plasmonic platforms: synthesis, structure and FDTD simulations
PublicationPlasmonic platforms based on Au nanostructures have been successfully synthesized by directional solidification of a eutectic from Au and the substrate. In order to determine homogeneous shape and space distribution, the influence of annealing conditions and the initial thickness of the Au film on the nanostructures was analyzed. For the surface morphology studies, SEM and AFM measurements were performed. The structure of platforms...
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Curb-to-Barrier Face Distance Variation an a TB51 Bridge Barrier Crash Test Simulation
PublicationThis paper addresses the problem of road safety regarding barrier placement as relative to the curb. A short summary of existing regulations is presented. Numerical simulations using the explicit finite element system Ls- Dyna are shown. In the analysis, variable distance between the barrier and the curb is assumed. The obtained result reveals that the distance has little impact on the working width of the barrier.
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Po sisu i hygge na gdańską skandynawistykę. Z prof. Katarzyną Wojan i mgr. Tomaszem Archutowskim z Instytutu Skandynawistyki i Fennistyki Wydziału Filologicznego UG rozmawia Tomasz Neumann
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Równoległe algorytmy wydobywania wiedzy w bazach danych obiektów graficz-nych.**2003 s. ...maszyn. Rozprawa doktorska (25.11.2003) PG, Wydz. ETI Promotor: prof. dr hab. inż. Henryk Krawczyk
PublicationZdefiniowano i opracowano algorytmy wydobywania wiedzy wykorzystujące danegraficzne. W odniesieniu do bieżących osiągnięć nauki zaproponowano metodęwłączenia obrazów (w szczególności medycznych) do reguł wiedzy. Algorytmysekwencyjne budowy reguł wiedzy i klasyfikacji zastąpiono ich odpowiednikamirównoległymi. Omówiono cechy środowiska które pozwala takie algorytmy efek-tywnie wykonywać. Przeprowadzono teoretyczne oszacowanie...
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Efektywność mechanizmów QoS w lokalnych sieciach bezprzewodowych.**2004 s....rys... bibliogr. ...maszyn. Rozprawa doktorska: /30.03.2004/ P. Gdań. Wydz. ETI Promotor: prof. dr hab. inż. J. Woźniak.
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Quality assessment of low voltage surge arresters
PublicationUsers expect reliable operation of the surge arrester during overvoltages, which may originate from a switching process or a lightning discharge. The necessary conditions to guarantee these expectations are: appropriate construction of the surge arrester, its production being maintained in accordance with technical standards, and a positive results of the type test (as well routine and acceptance tests). The recipient, especially...
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Grzybolubka lepka Asterophora parasitica(Pers.: FR.) Singer w Lasach Oliwskich (Trójmiejski Park Krajobrazowy) = Asterophora parasitica (Pers.:Fr) Singer in Oliwskie Forests (Trójmiejski Landscape Park)
PublicationW pracy przedstawiono stanowisko grzybolubki lepkiej zlokalizowane w Lasach Oliwskich oraz zamieszczono opis gatunku.
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Nowe stanowiska maczużnika bojowego Cordyceps militaris (L.) Link w Gdańsku i jego okolicach
PublicationW pracy przedstawiono trzy nowe stanowiska maczużnika bojowego Cordyceps militaris znalezione na obszarze Gdańska oraz w jego okolicach.
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Equilibrium of Trichloroethylene Adsorption from Aqueous Solution onto Activated Carbons
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Mass transfer in the bath reactor of the adsorption process of 1,2-dichloropropane from aqueous solution onto the activated carbon
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Isotherms, Isosteres, and Enthalpy of Adsorption of 1,2-Dichloroethane from Aqueous Solution onto Activated Carbons
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