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Wyniki wyszukiwania dla: MECHANIKA BUDOWLI
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Cosmic-Time Quantum Mechanics and the Passage-of-Time Problem
PublikacjaA new dynamical paradigm merging quantum dynamics with cosmology is discussed.
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INFLUENCE OF CERAMIC COATING ON MECHANICAL PROPERTIES OF STAINLESS STEEL
PublikacjaCrystal 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
PublikacjaA 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
PublikacjaThe 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
PublikacjaThe 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
PublikacjaThis 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
PublikacjaHere 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
PublikacjaPolyurethane (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
PublikacjaOur 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
PublikacjaRecently, 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
PublikacjaLithium 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...
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Light-Modulated Sunscreen Mechanism in the Retina of the Human Eye
PublikacjaThe functioning of the human eye in the extreme range of light intensity requires a combination of the high sensitivity of photoreceptors with their photostability. Here, we identify a regulatory mechanism based on dynamic modulation of light absorption by xanthophylls in the retina, realized by reorientation of pigment molecules induced by trans–cis photoisomerization. We explore this photochemically switchable system using chromatographic...
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Chemical and Mechanical Properties of 70-Year-Old Concrete
PublikacjaThe aim of this research is to determine the durability and strength of concrete continuous footing based on the chosen mechanical, physical, and chemical properties of the concrete. The presented investigations constitute some opinions from experts on the bearing capacity of concrete continuous footing and the possibilities of carrying additional loads and extended working life. The cylindrical specimens were taken from continuous...
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Mechanism of Osmolyte Stabilization–Destabilization of Proteins: Experimental Evidence
PublikacjaIn this work, we investigated the influence of stabilizing (N,N,N-trimethylglycine) and destabilizing (urea) osmolytes on the hydration spheres of biomacromolecules in folded forms (trpzip-1 peptide and hen egg white lysozyme─hewl) and unfolded protein models (glycine─GLY and N-methylglycine─NMG) by means of infrared spectroscopy. GLY and NMG were clearly limited as minimal models for unfolded proteins and should be treated with...
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Effects of mechanical stress on electrical arameters and noise of supercapacitors
PublikacjaResults of noise and electrical parameters measurements of prototype electrochemical double layer capacitors (EDLC) are reported at the presence of selected mechanical stress. This issue is of great importance due to future applications in wearable technology. The measurement results are compared, and we may conclude than flicker noise is more sensitive to any stress than other considered electrical parameters.
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Mechanical properties of dissimilar welded joints for chemical tankers
PublikacjaArtykuł przedstawia właściwości mechaniczne złączy różnoimiennych stali typu duplex oraz austenitycznej typu 316L otrzymanych za pomocą spawania automatycznego łukiem krytym. Wykazano możliwość wykorzystania wysokowydajnej metody SAW w miejsce dotychczas stosowanych metod GTAW i GMAW do spawania blach zbiorników statków do przewozu chemikaliów. Pomimo obawy uzyskania nieodpowiednich struktur złączy okazało się, że spawanie stali...
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JOURNAL OF FLUID MECHANICS
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Porównanie właściwości wybranych środków do stabilizacji gruntów na budowie autostrady A1
PublikacjaW pracy porównano właściwości spoiw występujących na polskim rynku. Przeprowadzono badania laboratoryjne gruntu z 8 spoiwami. Uzyskane właściwości gruntu stabilizowanego róznymi spoiwami porównywano ze stabilizacją cementem i wapnem. Najlepsze wyniki dla badanej gliny uzyskano przy stabilizacji cementem, co jest zaskakujące. Żadne spoiwo nie zapewniło wymaganej mrozoodporności.
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Nowe trendy w budowie automatycznych urządzeń przełączających SZR/SPP niskiego napięcia
PublikacjaW referacie omówiono funkcje realizowane przez automatyczne urządzenia przełączające (ATSE) w sieciach niskiego napięcia, w tym głównie SZR. Przytoczono podział odbiorców energii elektrycznej na kategorie wg dopuszczanego czasu przerwy w zasilaniu. Scharakteryzowano cechy urządzeń ATS z aparatami wykonawczymi różnych rodzajów. Zaprezentowano dwa rozwiązania elektrycznych blokad przed jednoczesnym załączeniem dwóch linii zasilających,...
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Techniki szybkiego prototypowania w budowie maszyn = Rapid prototyping techniques in machine building
PublikacjaW artykule omówiono przygotowanie oraz wykonanie poszczególnych elementów maszyn za pomocą techniki szybkiego prototypowania. W pierwszej części przedstawiono technologię wydruku przestrzennego oraz właściwości materiału budulcowego. Druga część artykułu została poświęcona przykładowym wydrukom i ich zastosowaniom w maszynach.
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Mohammad Malikan dr inż.
OsobyMohammad Malikan studied Ph.D. at the Department of Mechanics of Materials and Structures at the Gdańsk University of Technology. He was the first person who graduated in the new form of the doctoral education system of Poland (Doctoral School). He has worked as a mechanical engineer and designer for several years in CAD/CAE fields in various industries, such as feed production lines, machinery, elevator, oil, etc. His main research...
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Advances in Applied Mathematics and Mechanics
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CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY
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Chinese Journal of Mechanical Engineering
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Composites-Mechanics Computations Applications
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Archives of Mechanical Technology and Materials
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Australian Journal of Mechanical Engineering
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Journal of Computational Applied Mechanics
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Archives of Mechanical Technology and Automation
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Journal of Mechanics Engineering and Automation
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European Journal of Computational Mechanics
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WSEAS Transactions on Fluid Mechanics
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CHINESE JOURNAL OF MECHANICS-SERIES A
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Journal of Mechanical Engineering and Sciences
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Proceedings of the Institute of Mathematics and Mechanics
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Moscow University Mechanics Bulletin
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Mathematics and Mechanics of Complex Systems
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Periodica Polytechnica, Mechanical Engineering
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Journal of the Mechanical Behavior of Materials
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Recent Patents on Mechanical Engineering
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Theoretical and Applied Mechanics Letters
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Annals of Solid and Structural Mechanics
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Universal Journal of Mechanical Engineering
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Theoretical and Applied Mechanics Japan
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Mechanics of Advanced Composite Structures
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ROCK MECHANICS AND ROCK ENGINEERING
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Journal of Mechanics of Materials and Structures
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Journal of Mechanical Science and Technology
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Journal of Theoretical and Applied Mechanics
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MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
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