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Search results for: MECHANIKA KLASYCZNA
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Kinematic analysis of crank -cam mechanism of process equipment
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Optimum control of the selected vibration forms in mechanical systems
PublicationW artykule przedstawiono zagadnienie optymalnego sterowania wybranymi formami drgań układów mechanicznych. Dla zaprezentowania sposobu i procedury wyznaczania optymalnych nastaw regulatora i współczynników wagowych wskaźnika jakości posłużono się dwoma przykładami liczbowymi. W pierwszym z nich rozważano uproszczony układ mechaniczny składający się z dwóch sztywnych elementów skończonych połączonych za pomocą elementów sprężysto-tłumiących,...
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Mechanism of the reaction of Lawesson's reagent with N-alkylhydroxamic acids
PublicationIdentyfikacja fosforowych produktów powstających w reakcji kwasów hydroksamowych z odczynnikiem Lawessona pozwoliła ustalić mechanizm tytułowej reakcji. Wykorzystano w tym celu spektroskopię 31P NMR. Wzorce labilnych produktów otrzymano na niezależnej drodze syntetycznej lub przeprowadzono je w trwałe pochodne, które wyizolowano z mieszanin reakcyjnych. Produktem przejściowym badanej reakcji okazał się odpowiedni O-ditiofosfonylowany...
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Sawing of wood - mechanics of cutting process, tools and machines.
PublicationW pracy przedstawiono wpływ obciażenia piły na dokładnośc przecinania. Zaprezentowano pilarkę ramową z eliptyczną trajektorią ruchu pił i hybrydowym dynamicznie wyrównoważonym napędem ramy piłowej, jak również wizyjny kontroler ostrzy pił tarczowych.
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A new integrated curriculum for computational methods in mechanics and design
PublicationPrzedstawiono program nowej specjalności na studiach inżynierskich: metody numeryczne w mechanice i projektowaniu, prowadzonej w języku angielskim.
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Jubileusz Wydziału Mechanicznego = Jublee of Faculty of Mechanical Engineering
PublicationPrzedstawiono skrótowo historię Wydziału Mechanicznego od roku 1904, w perspektywie 100. letniej tradycji kształcenia wyższego w Gdańsku oraz 60. lecia Wydziału Mechanicznego Politechniki Gdańskiej. Scharakteryzowano problematykę kształcenia oraz prowadzonych badań naukowych, a także program obchodów Roku Jubileuszowego.
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The Effect of Temperature on Wear Mechanism of the AlCrN Coated Components
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Multiparameter analysis of Stirling engine with Ericsson drive mechanism.
PublicationW pracy zaprezentowano wyniki optymalizacji parametrów konstrukcyjnych silnika Stirlinga o konfiguracji beta z mechanizmem korbowym Ericssona. Jako kryterium przyjęto maksymalizację mocy silnika. W pierwszym etapie poddano optymalizacji tylko parametry konstrukcyjne wymiennika ciepła (7 zmiennych) W drugim etapie do powyższych zmiennych decyzyjnych procesu optymalizacyjnego dołączono wymiary tłoka oraz parametry konstrukcyjne...
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Mechanizm koordynacji budżetów operacyjnych w przedsiębiorstwie przemysłowym.
PublicationArtykuł obejmuje opis procedur stosowanych w zakresie łączenia budżetów operacyjnych ze sprawozdaniami finansowymi z wykorzystaniem wskaźników finansowych określających cele działalności przedsiębiorstwa
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Theoretical studies of the pyranose ring under mechanical stress
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Glucocorticoids Inhibit Wound Healing: Novel Mechanism of Action
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Optimization and improvement of the ARQ mechanism in RLC layer in UMTS.
PublicationParametry wydajnościowe warstwy RLC systemu UMTS są silnie uzależnione od ich konfiguracji początkowej i dynamicznych zmian. Celem referatu była prezentacja efektywności pracy warstwy RLC, w trybie AM, ze szczególnym uwzględnieniem mechanizmu ARQ. Zaproponowano procedury optymalizacji ustawień parametrów RLC. Opisano też metody dalszej poprawy efektywności funkcjonowania RLC AM, poprzez zdefiniowanie i zaimplementowanie nowych...
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Experimental tests for the determination of mechanical properties of PVC foil
PublicationThe paper presents an application of the PVC film in civil engineering. Mechanical behaviour of the PVC film applied for suspended ceilings, in the form of a stretch ceiling is investigated under uniaxial and biaxial tensile tests. The study is focused on the determination of mechanical properties from experimental data (uniaxial and biaxial tensile tests). The uniaxial cyclic tests are performed in order to observe a variation...
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Influence of the grains shape on the mechanical behavior of granular materials
PublicationDiscrete Element Method is a numerical method suitable for modeling geotechnical problems concerning granular media. In most cases simple forms of grains, like discs or spheres, are used. But these shapes are capable of soil behavior modeling up to a certain point only, they cannot reflect all of the features of the medium (large shear resistance and large volumetric change). In order to reflect the complex behavior of the real...
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Influence of grain shape on the mechanical behaviour of granular materials
PublicationWe performed series of numerical vertical compression tests on assemblies of 2D granular material using a Discrete Element code and studied the results in regard to the grain shape. The samples consist of 5000 grains made either of 3 overlapping discs (clump - grain with concavities) or of six-edged polygons (convex grain). These two types of grains have a similar external envelope, ruled with a geometrical parameter α. In the...
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The methods of braking forces measurement for e mechanical vehicle
PublicationPrzedstawiono metody pomiaru sił hamowania pojazdów samochodowych.
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Analysis of a micro electro-mechanical platform for laparoscopic surgery
PublicationNiniejsza praca ma na celu określenie możliwości zastosowania odkształcalnych urządzeń o kinematyce równoległej w mikro robotycznych przegubach dla igło-laparoskopii. Operacje chirurgiczne przeprowadzane z użyciem narzędzi laparoskopowych o zmniejszonej średnicy nazywane są igłoskopią (z ang. needlescopy). Narzędzia te pozwalają na przeprowadzanie precyzyjnych operacji na stosunkowo niewielkim obszarze i z zaletami mało inwazyjnych...
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The carbohydrate glycosylphosphatidylinositol anchor chain under mechanical stress
PublicationCarbohydrates have quite complicated micro heterogenic structure which may undergo different structural transitions. Due to their extreme flexibility it is very difficult to investigate such structural changes experimentally. In these studies we want to predict what structural and conformational changes are possible in the carbohydrate
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Implementation mechanism of impact investing in the post-conflict regions
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A New Epigenetic Mechanism of Temozolomide Action in Glioma Cells
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Refinements to the Utah–Washington Mechanism of Electron Capture Dissociation
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Education at the Faculty of Mechanical Engineering of the Gdańsk University of Technology
PublicationFaculty of Mechanical Engineering is one of the largest departments of the Gdańsk University of Technology (GUT), currently educating about 3 000 student. Lectures are conducted in five Chairs, which include 18 Divisions. In 2000 GUT introduced the European Credit Transfer and Accumulation System (ECTS). Each student should get during one academic year 60 ECTS points. Obtaining a diploma of BEng requires the acquisition of no less...
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Education at the Faculty of Mechanical Engineering of the Gdańsk University of Technology
PublicationFaculty of Mechanical Engineering is one of the largest departments of the Gdańsk University of Technology (GUT), currently educating about 3 000 student. Lectures are conducted in five Chairs, which include 18 Divisions. In 2000 GUT introduced the European Credit Transfer and Accumulation System (ECTS). Each student should get during one academic year 60 ECTS points. Obtaining a diploma of BEng requires the acquisition of no less...
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THE MODELLING OF ACCUMULATION AND DISSIPATION OF ENERGY IN MECHANICAL DRIVE SYSTEM
PublicationThis paper presents a modelling of accumulation and dissipation energy in simple drive system. The simple drive system is presented by laboratory stand designed for calculate fatigue life of material for bending and rotation tests pieces. The laboratory stand was prepared to diagnosis of fatigue life of material by use energetic methods. This idea was submitted as utility model to Polish Patent Office. This laboratory stand gives...
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Mechanical properties of mosquito nets in the context of hernia repair
PublicationThe paper deals with issue of applying mosquito nets as implants in hernia repair, which have already been used in resource-poor developing countries. Uniaxial tensile tests have been conducted on polyester mosquito meshes in two orthogonal directions. Non-linear elastic constitutive laws parameters have been identified to be applied in dense net material models. Mechanical performance of tested mosquito nets has been compared...
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Kinetics and mechanism of the chemically modified starches during gelatinization.
PublicationNative starch was silicated by means of microwave-assisted reactions with varying doses of reagents. Resulting products were characterized by DSC and HMR-relaxation methods. It was observed that the hydratation of the silicated starches during gelatinization decreases when compared to that of the native potato starch. The amount of unfrozen water for ungelitinizated silicated starches are less than in control samples. At the same...
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Effect of microstructure on mechanical properties of BA1055 bronze castings
PublicationThe article presents research results performed on aluminum bronze CuAl10Fe5Ni5 (BA1032) castings used for marine propellers. Metallographic studies were made on light microscope and a scanning electron microscope to assess quantitatively and qualitatively the alloy microstructure. It has been shown that the shape, size and distribution of the iron-rich phase precipitates in bronze microstructure significantly affect its mechanical...
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Experimental determination of basic mechanical properties of elastomeric polymer
PublicationThere are a lot of different methods of repairing and reinforcing damaged structures, but when it comes to historical buildings and other cultural heritage objects, it is as much about mechanical safety as the aesthetical aspects. Recently, a new and innovative method of repairing damaged structures by filling the cracks with a specially prepared polymer mass has been proposed. This new and innovative technique, known as the Flexible...
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Some mechatronic solutions towards a surveillance of mechanical systems
PublicationCelem artykułu jest przedstawienie nowych rozwiązań związanych z nadzorowaniem systemów mechanicznych. Przedstawia on zmodyfikowaną metodę nadzorowania drgań opartą na sterowaniu modalnym i energetycznym wskaźniku jakości, nadzorowanie drgań z wykorzystaniem zmiennej prędkości obrotowej, nadzorowanie drgań systemu hybrydowego z wykorzystaniem sterowania optymalnego i energetycznego wskaźnika jakosci oraz nadzorowanie ruchu mobilnego...
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mechanical engineering education via projects in multibody dynamics
PublicationPraca prezentuje rozważania nad wykorzystaniem interdyscyplinarnych projektów bazujących na zasadach dynamiki układów wieloczłonowych, traktowanych tu jako rozwinięcie kursu klasycznej mechaniki. Celem dydaktycznym jest zebranie w jednym procesie dydaktycznym takich aspektów jak: możliwość wykorzystania poznanych teoretycznie równań do modelowania i analizy znanego mu obiektu rzeczywistego; umożliwienie formułowania i testowania...
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Degradation kinetics and mechanism of pentoxifylline by ultraviolet activated peroxydisulfate
PublicationDegradation of pentoxifylline (PTX) by sodium peroxydisulfate (SPDS) assisted by UV irradiation has been investigated in deionized water. The treatment was more favorable over direct photolysis or peroxydisulfate oxidation alone. The effects of various parameters, including different dosage of oxidant agent, PTX concentration, initial solution pH levels, and the presence of inorganic ions like chloride, nitrate and carbonate have...
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The mechanism of grouting action under the base of bored pile
PublicationThe grouting under the base of bored pile is carried out in order to reduce pile settlement and improve its bearing capacity. The principal aim of grouting is to introduce an initial force between the soil and the pile base. In non-cohesive soil, the grouting can also enlarge the pile base area and therefore improve the base resistance. The example of static load tests on instrumented bored piles installed with and without grouting...
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Evaluating Asymmetric N-Grams as Spell-Checking Mechanism
PublicationTypical approaches to string comparing marks two strings as either different or equal without taking into account any similarity measures. Being able to judge similarity is however required for spelling error corrections, as we want to find the best match for a given word. In this paper we present a bi2quadro-grams method for spelling errors correction. The method proposed uses different n-grams dimension for the source (checked)...
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A self-optimization mechanism for generalized adaptive notch smoother
PublicationTracking of nonstationary narrowband signals is often accomplished using algorithms called adaptive notch filters (ANFs). Generalized adaptive notch smoothers (GANSs) extend the concepts of adaptive notch filtering in two directions. Firstly, they are designed to estimate coefficients of nonstationary quasi-periodic systems, rather than signals. Secondly, they employ noncausal processing, which greatly improves their accuracy and...
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Mechanism of the fatigue cracks development in bearing slide layer
PublicationNa podstawie literatury przedstawiono wybrane problemy dotyczące powiązania wytrzymałości zmęczeniowej łożysk ślizgowych ze strukturą i charakterystyką materiału tworzącego warstwę ślizgową panwi.W szczególności analizowano mechanizm inicjacji i propagacji pęknięć zmęczeniowych jako zależną nie tylko od wzorca obciążenia dynamicznego, lecz również od geometrii i struktury warstwy ślizgowej.Wyróżniono dwa typy pęknięć: strukturalne...
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Mechanizm transakcji forward na masowe produkty rolne
PublicationArtykuł dotyczy jednego ze sposobów zawierania i rozliczania transakcji na masowe produkty rolne.
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The morphology and mechanical properties of recyclated polyethylene/polyamide laminate
PublicationZbadano wpływ kompatybilizatorów na morfologię i właściwości mechaniczne mieszanin PE/PA. Okreslono właściwości recyklatu uzyskanego z odpadów barierowej folii wielowarstwowej zawierającej 80% PE i 20% PA. Po dodaniu kompatybilizatorów układ stał się bardziej jednorodny, zmniejszeniu uległy domeny PA oraz poprawiły się właściwości mechaniczne.
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Regulacyjny mechanizm interwencyjny w sektorze łączności elektronicznej
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Influence of steam drying process on wood mechanical properties
PublicationResults of influence of gas-steam mixture drying process on mechanical properties of material are presented. Wood species, namely oak (Quercus L.), beech (Fagus L.), pine (Pinus L.) and spruce (Picea K.) from the northern part of Pomerania region in Poland, were subject of air-steam mixture drying process in a laboratory kiln especially arranged for that reason. Measurements of the global coefficient of elasticity and bending strength...
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Cosmic-Time Quantum Mechanics and the Passage-of-Time Problem
PublicationA new dynamical paradigm merging quantum dynamics with cosmology is discussed.
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INFLUENCE OF CERAMIC COATING ON MECHANICAL PROPERTIES OF STAINLESS STEEL
PublicationCrystal structure and phase composition of stainless steel substrates (AISI 304 type) was studied and it was found that they adopted the cubic symmetry. The calculated elementary cell parameter for the mayor Fe-Ni phase (weight fraction 99%) was a = 3.593 Å, whereas the mean grain size was = 2932 Å. Morphology of the stainless steel substrate surface was studied with profilometry. Mechanical properties of the stainless steel...
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Performance of organic coatings upon cyclic mechanical load
PublicationA number of engineering structures fail due to the fatigue damage resulting from cyclic mechanical stress. However, as far as organic coatings are concerned this degradation factor remains underestimated. In the paper the authors propose a methodology combining global electrochemical impedance spectroscopy and local atomic force microscopy measurements for evaluation of coating resistance to an impact of repetitive mechanical stress. Typical...
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CHARACTERIZATION STUDY ON MECHANICAL PROPERTIES OF POLYESTER COATED FABRIC
PublicationThe scope of the paper is to determine the mechanical properties of the Precontraint 1302 polyester coated fabric under uniaxial and biaxial tensile tests. The results are compared for Precontraint 1302 fabric and other types of coated fabrics. The author applied an orthotropic model and a dense net model to reflect the polyester coated fabric performance under uniaxial and biaxial tensile tests. Material parameters are specified...
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Minimising the Churn Out of the Service by Using a Fairness Mechanism
PublicationThe paper proposes an algorithm of bandwidth distribution, ensuring fairness to end-users in computer networks. The proposed algorithm divides users into satisfied and unsatisfied users. It provides fairness in terms of quality of experience (QoE) for satisfied users and quality of service (QoS) for unsatisfied users. In this paper, we present detailed comparisons relevant to service providers to show the advantages of the proposed...
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Mechanical and structural investigations of wings of selected insect species
PublicationThis paper presents research and measurements leading to obtaining the Young’s modulus of wing bearing structures of selected insect species. A small testing machine intended for three-point bending and equipped with instruments registering low forces was constructed for the needs of the experiment. The machine was used to perform numerous bending tests of wings of three species of insects (obtained from a breeding farm): Attacus...
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Some Introductory and Historical Remarks on Mechanics of Microstructured Materials
PublicationHere we present few remarks on the development of the models of microstuctured media and the generalized continua.
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Thermal and Mechanical Behavior of Elastomers Incorporated with Thermoregulating Microcapsules
PublicationPolyurethane (PU) is one of the principal polymers in the global plastic market thanks to its versatility and continuous improvement. In this work, PU elastomeric materials having thermoregulating properties through the incorporation of microcapsules (mSD-(LDPE·EVA-RT27)) from low-density polyethylene and vinyl acetate containing paraffin®RT27 as PCM were produced. Elastomers were synthesized while varying the molar ratio [NCO]/[OH]...
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From fluid mechanics backgrounds to modern field theory
PublicationOur presentation keeps a historical line of reasoning, since we start from old concepts of fluid mechanics and finish on concepts of modern field theory. We want to show that some facts from the nature phenomena, which have firstly been discovered on the ground of fluid mechanics, were next incorporated into physics and later become the important pattern for whole mathematical physics. Especially, well-known continuum models, which...
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Corrosion degradation impact on mechanical properties of structural steel
PublicationRecently, extensive research was conducted regarding the impact of corrosion degradation on the mechanical properties of structural steel. Studies show that at the material level, the microstructure is somewhat unchanged due to corrosion degradation. However, the corrosion causes pits and structural surface irregularities that consequently impact the mean stress-strain response of typical coupon specimens subjected to tensile loading....
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Mechanism of Li nucleation at graphite anodes and mitigation strategies
PublicationLithium metal plating is a critical safety issue in Li-ion cells with graphite anodes, and contributes significantly to ageing, drastically limiting the lifetime and inducing capacity loss. Nonetheless, the nucleation mechanism of metallic Li on graphite anodes is still poorly understood. But in-depth understanding is needed to rationally design mitigation measures. In this work, we conducted FirstPrinciples studies to elucidate...