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Wyświetlanie 1-15 z 665
Tytuł:
Influence of pitting corrosion on fatigue and corrosion fatigue of ship structures. Part I Pitting corrosion of ship structures
Autorzy:
Jakubowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/260006.pdf
Data publikacji:
2014
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
pitting corrosion
ship structures
offshore structures
Opis:
The present paper is a literature survey focused on a specific kind of corrosion, i.e. pitting corrosion and its influence on fatigue of ship and offshore steels. Mechanisms of a shortand long-term pitting corrosion in marine environment have been described including pit nucleation and growth phases. Some models of pit growth versus time of exposure have been presented. Some factors which influence the pit growth rate have been discussed briefly.
Źródło:
Polish Maritime Research; 2014, 1; 62-69
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison study of crystal and electronic structures for chalcopyrite $(CuFeS_2)$ and pyrite $(FeS_2)$
Autorzy:
Li, Yuqiong
Liu, Yingchao
Chen, Jianhua
Zhao, Cuihua
Cui, Weiyong
Powiązania:
https://bibliotekanauki.pl/articles/1448811.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
chalcopyrite
pyrite
crystal structures
electronic structures
Opis:
Chalcopyrite $(CuFeS_2)$ and pyrite $(FeS_2)$ are commonly associated with each other, and they both belong to semiconductor minerals. The difference in crystal and electronic structures is an important factor for their flotation separation. Using the density functional method (DFT) combined with Hubbard U correction, their crystal and electronic properties are comparatively studied. The calculated results suggest that the use of antiferromagnetic calculations and Hubbard U correction are very important to the accuracy of the chalcopyrite results. Antiferromagnetic calculations combined with a U value of 2.0 eV on chalcopyrite show a band gap of 0.53 eV, which is very consistent with the experimental results of ~0.5 eV. The density of states (DOS) and Mulliken bond population results indicate that stronger hybridization between Fe 3d and S 3p states in chalcopyrite than in pyrite leads to a stronger covalency of Fe-S bonds in chalcopyrite, causing a reduction in the spin magnetic moment (3.5 μB) from the ideal value. In addition, the greater covalency of bonds in chalcopyrite results in greater hydrophobicity of chalcopyrite than pyrite. The DOS results suggest that S has similar electronic properties in pyrite and chalcopyrite. The oxidation states of Fe and Cu ions in chalcopyrite are discussed based on the coordination field theory according to the calculation results, which confirms an oxidation state of $Fe^{3+}Cu^{1+}S_2$.
Źródło:
Physicochemical Problems of Mineral Processing; 2021, 57, 1; 100-111
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strength of normal sections of double-ply rubcon-concrete flexural structures using as a binder of polybutadiene oligomers
Autorzy:
Figovsky, O.
Potapov, Y.
Polikutin, A.
Powiązania:
https://bibliotekanauki.pl/articles/412457.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
strength
flexural members
double-ply structures
rubcon structures’
rubcon-concrete structures
Opis:
This paper presents the research of the strength of normal sections of rubcon-concrete flexural members with different locations and ratios of the plies to reveal the effect of combing such materials in structures.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2015, 40; 88-92
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of two systems of point-free topology
Autorzy:
Gruszczyński, Rafał
Pietruszczak, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/749986.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
point-free topology
region-based topology
foundations of topology
mereology
mereological structures
separation structures
connection structures
Grzegorczyk structures
Biacino-Gerla structures.
Opis:
This is a spin-off paper to [3, 4] in which we carried out an extensive analysis of Andrzej Grzegorczyk’s point-free topology from [5]. In [1] Loredana Biacino and Giangiacomo Gerla presented an axiomatization which was inspired by the Grzegorczyk’s system, and which is its variation. Our aim is to compare the two approaches and show that they are slightly different. Except for pointing to dissimilarities, we also demonstrate that the theories coincide (in the sense that their axioms are satisfied in the same class of structures) in presence of axiom stipulating non-existence of atoms.
Źródło:
Bulletin of the Section of Logic; 2018, 47, 3
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of pitting corrosion on fatigue and corrosion fatigue of ship and offshore structures. Part II: load - pit - crack interaction
Autorzy:
Jakubowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/260195.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
pitting corrosion
fatigue
ship structures
offshore structures
Opis:
In the paper has been discussed influence of stresses on general corrosion rate and corrosion pit nucleation rate and growth , whose presence has been questioned by some authors but accepted by most of them. Influence of roughness of pit walls on fatigue life of a plate suffering pit corrosion and presence of the so called „ non-damaging” pits which never lead to initiation of fatigue crack, has been presented. Possibility of prediction of pit-to-crack transition moment by two different ways, i.e. considering a pit a stress concentrator or an equivalent crack, has been analyzed. Also, influence of statistical distribution of depth of corrosion pits as well as anticorrosion protection on fatigue and corrosion fatigue has been described.
Źródło:
Polish Maritime Research; 2015, 3; 57-66
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technological Aspects of Execution of Welded Joints in Hollow Sections
Autorzy:
Kuchta, K.
Silezin, R.
Żwirek, P.
Powiązania:
https://bibliotekanauki.pl/articles/104810.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
steel structures
lattice structures
welded joints
hollow section
Opis:
Steel structures designed according to Eurocode 3 are executed in accordance with the provisions of the standard PN-EN 1090-2, which is referred to in Eurocode 3. In addition, the standard PN-EN 1090-2 refers to in its content a number of welding standards, e.g. PN-EN ISO 9692-1. These standards provide guidelines for welded connections, which should be applied in the case of joints connecting steel hollow sections. Analysis of above-mentioned provisions revealed that for fillet welds they are simultaneously fulfilled only if the inclination angles of the elements are in the range of 70°-100°. According to recommendations of PN-EN 1993-1-8 and EN 1090-2, the same weld type around the perimeter of the element connected to the chord of lattice structure is possible to execute only for inclination angle lower than 60°. Discrepancies between these standards also exist with regard to the interpretation of the dimension of the flare groove welds in connections of rectangular hollow sections with the same width. In addition, analyses of the recommendations for welding in cold-formed zones indicate that, for steel grades currently used for the production of cold-formed rectangular hollow sections, welding in these zones is not permitted only for profiles with wall thickness equal to 12.5 and 16 mm. The above-mentioned issues point out the need for mutual unification of standards for the design and execution of steel joints in hollow sections.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 35-42
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research activities in smart materials and structures and expectations to future developments
Europejskie badania nad materiałami i konstrukcjami "inteligentnymi" oraz oczekiwania w zakresie przyszłych rozwiązań
Autorzy:
Gabbert, U.
Powiązania:
https://bibliotekanauki.pl/articles/281396.pdf
Data publikacji:
2002
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
active materials
smart structures
intelligent structures
future trends
Opis:
The paper starts with a brief introduction into the main ideas and concepts of smart materials and structures. Then, an overview about German research activities in this field is given. Some of the project are summarized, including the main research ideas, some results, experiences, etc. Finally, a look into the future is ventured as a very important task to adjust research directions. The paper presents author's expectations, which are based upon his own research experiences and several discussions with colleagues in Europe, USA, Japan etc.
Praca zawiera krótkie wprowadzenie w główne koncepcje z zakresu materiałów i konstrukcji "inteligentnych". Prezentuje przegląd europejskich ośrodków badawczych zajmujących się tą tematyką. Niektóre z prowadzonych projektów opisano, przybliżając podstawowe zadania badawcze oraz podsumowano wyniki i doświadczenia z tych badań. Na koniec podjęto próbę określenia przyszłych kierunków rozwoju omawianej dziedziny. Praca przedstawia oczekiwania autorów bazujących na swych własnych doświadczeniach oraz dyskusji przeprowadzonej z ich kolegami w Europie, Stanach Zjednoczonych, Japonii itp.
Źródło:
Journal of Theoretical and Applied Mechanics; 2002, 40, 3; 549-574
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Execution and Inspection of Steel Hollow Sections Welded Joint
Autorzy:
Kuchta, K.
Silezin, R.
Żwirek, P.
Powiązania:
https://bibliotekanauki.pl/articles/104583.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
steel structures
lattice structures
hollow section
welded joints
welds
Opis:
The hollow section welded joints require a number of actions before starting welding and appropriate supervision during this operation to achieve joints with adequate quality level, which should be confirmed by the post-completion tests. The execution of hollow section joints is associated not only with welding, but also with cutting and additional machining of edges. In some cases, weld surfacing is also applied to correct sections fit-up. Weld surfacing and thermal cutting can cause local hardening of connected elements. The welding has to be preceded by an assessment of the previous technological processes. The welded joints can be only executed on the basis of detailed Welding Procedure Specifications (WPS). It is advisable to manufacture - in accordance with previously prepared WPS - pre-production joints for testing, proving the ability of the welding personnel to execute welded joints with specified quality, using the available equipment. The quality of welded joints is proved by testing. A type of conducted tests, thus scope and type of welding defects possible to detect, depends on the weld type, wall thickness of connected elements and joint geometry. The authors’ experience indicates that the proper execution of the welded joint of hollow sections is difficult task, which often requires pre-production quality testing of the joints.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 2; 69-80
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Digital Radiography (Dr) in an Approach to Evaluate the Technical Condition of MiG-29’s Vertical Stabilizers
Autorzy:
Luziński, Rafał
Synaszko, Piotr
Dragan, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2105179.pdf
Data publikacji:
2021
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
Tematy:
NDT
digital radiography
inspection of internal structures
composite structures
Opis:
The purpose of the work presented was to evaluate the capabilities of digital radiography to detect cracks in the internal structure of MiG-29 vertical stabilizers. The test object was a stabilizer previously subjected to fatigue testing and partially torn down for the needs of visual inspection. An inspection of three regions containing cracked parts was performed, with use of a pulsed x-ray generator and digital detector array. The results confirmed the method could be used to detect cracks in an internal structure which could not be inspected with other methods without affecting the stabilizer’s integrity.
Źródło:
Fatigue of Aircraft Structures; 2021, 13; 1--7
2081-7738
2300-7591
Pojawia się w:
Fatigue of Aircraft Structures
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The North-Central Sicily Belt: structural setting and geological evolution
Autorzy:
Nigro, F.
Renda, P.
Powiązania:
https://bibliotekanauki.pl/articles/191316.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
structures
palaeogeography
Sicily
Opis:
North-Central Sicily represents an Apenninic-Maghrebian Chain sector, deriving from the Miocene- Pliocene deformation of different palaeogeographic domains-derived successions (carbonate platforms and pelagic basins), piled-up in ramp-flat and duplex style, and belonging during the Mesozoic-Tertiary to the Northern African Continental Margin. These domains are represented by outcropping basinal sedimentary successions (Imerese-Sicanian Basin), geometrically interposed between carbonate platform rock bodies: the Panormide (innermost) and the Hyblean-Pelagian Domains (more external). In this paper, using stratigraphic and structural data, we propose a new palaeogeographic model, in which the main differences from previous interpretations consist in the position of the Imerese Basin, here identified as the juncture between the Panormide Domain and the Sicanian Basin Auct., and the position of the Trapanese pelagic carbonate platform, considered as the juncture between the Hyblean-Pelagian Domain and the Sicanian Basin Auct. Tectono-sedimentary steps characterising the evolution of the Sicilian Miocene-Pliocene Foredeep illustrate the deformational history of the area. Two geological cross-sections depict the structural architecture of the tectonic edifice, characterised by different thrust sheets piled-up during the Miocene-Pleistocene time. The more external tectonic units are formed by elements deriving from the Plio-Pleistocene deformation of the northern margin of the Hyblean-Pelagian Domain. The "intermediate" tectonic units derive from the Miocene-Pliocene deformation of the Imerese- Sicanian Domain and the inner tectonic units are constituted by Panormide and Sicilide Domains-derived successions, deformed during the Miocene. A mostly neotectonics-related transcurrent faults reoriented the previous thrust sheets through NW-SE and W-E trending faults, producing large-scale positive flower structures which involved the geometrically deepest Hyblean-Pelagian substrate.
Źródło:
Annales Societatis Geologorum Poloniae; 1999, 69, No. 1-2; 49-61
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Barrier Structures on the Basis of Graded-Band-Gap CdHgTe Obtained by Evaporation-Condensation-Diffusion Method
Autorzy:
Świątek, Z.
Vlasov, A. P.
Ivashko, M. V.
Petryna, R. L.
Bonchyk, A. Yu.
Sokolovskii, B. S.
Powiązania:
https://bibliotekanauki.pl/articles/958223.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obtaining photovoltaic structures
barrier structures
evaporation-condensation-diffusion method
Opis:
The paper presents the methods of obtaining photovoltaic structures based on CdXHg1-XTe graded-band-gap epitaxial layers. Barriers in these structures were formed by solid phase doping of the material with low-diffusing impurities (As). High-temperature diffusion of acceptor impurity (As) in intrinsically defective material of n-type conductivity as well as ion introducing the donor impurity (B) in uniformly doped during the epitaxy process material of p-type of conductivity have been used. The possibility of creating multi-element graded-band-gap photovoltaic structures suitable for broad band detection of infrared radiation as a result of epitaxial growth by evaporation-condensation-diffusion method has been demonstrated.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 115-122
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relations between lean management and organizational structures
Autorzy:
Faron, A.
Powiązania:
https://bibliotekanauki.pl/articles/409160.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
elastyczność struktur organizacyjnych
lean management
organizational structures
organizational structures' flexibility
Opis:
Lean management is a method, the implementation of which brings many benefits and good results to companies. More and more firms decide to transform to become more lean – focusing on eliminating as much waste as it is possible, simultaneously bringing value to customers and motivation to workers. The article focus on examining, whether there is a relation between lean management and organizational structures in companies implementing that method. Additionally it is checked if there is any connection between the structures and company internationalization in those firms. At first, the article provides a brief description of lean management method, the history and main principles behind it. It is followed by a short presentation of some organizational types of structures, basing on the flexibility of these specific solutions. Next, on the ground of the literature, different views about the relations between organizational structures and lean are mentioned. Finally, the author presents some results of her own research conducted in the companies implementing lean management, assesses the types of structures and prospective changes depending on companies’ internationalization and the time of lean implementation.
Źródło:
Research in Logistics & Production; 2012, 2, 1; 103-114
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected problems concerning the analysis of thin-walled structures with the use of finite element method
Autorzy:
Jachimowicz, J.
Mańkowski, J.
Osiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/243328.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
diagonal tension
wing structures
thin-walled structures
aircraft
FEM
modelling
Opis:
The aim of the paper was presentation and comparison of numerical methods applied in thin-walled structures analysis, with special attention paid to possibility of usage the Finite Element Method (FEM), especially in nonlinear analysis. There were presented basic differences between classical approach to modelling and analyzing thin-walled structures, and these performed with FEM methods using. The biggest emphasis was placed on the analysis of semimonocoąues, in which the loss in the shell 's stability is possible in the range of operational load activity. According to this, many nonlinear terms like global and local buckling, contact problems, significant deformations and shifts, are present. Worth emphasizing is the fact, that tension field, is something that was described long time ago. First paper s about this phenomenon were published in the last century. Although it is a common effect that takes place in semimonocoques, there are not many publications that analyze and examine this phenomenon. In this paper, an analysis of two-sided, thin-walled spar, which has undergone the flexion by the shearing force in the plane of the panel, was presented. The spar was designed as a classic semimonocoque, in which load transmission function is separated. It was assumed that, for the sake of small thickness, shell elements transmit mainly tangential loads, normal loads, when normal loads are transmitted by framework elements. Riveted joints are used to join elements of framework and shell. There are presented and compared results of analysis for models with various complexities. Firstly, results of analysis of classical model of semimonocoques were presented. It means that framework elements were modelled as rod elements transmitted only normal loads, but shell elements were modelled as disc semimonocoque elements, in this case transmitted only tangential loads. Area of section of rod elements was adequately increased, in order to consideration mating width, coming from partial transmission of normal loads by the shell elements. Results obtained for intermediate models were also presented, as well as for complex shell model, which allows on advanced nonlinear analysis of tension field, which consider contact between framework and shell elements. Applications of formulated models to thin-walled structure, especially aircraft ones and further possibilities of presented method of analysis were discussed.
Źródło:
Journal of KONES; 2008, 15, 1; 109-118
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural Failure of Buildings: Issues and Challenges
Autorzy:
Almarwae, Mohammed
Powiązania:
https://bibliotekanauki.pl/articles/1182745.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Buildings
bracing structures
construction materials
earthquake
seismology
structural failure
structures
Opis:
This paper discusses a list of information and issues that causes of structural failure of buildings. Structural failure begins to occur when the material is stressed to its upper strength limit causing to rupture or extreme deformations. The ultimate strength of the material or the system is the limit of the load bearing capacity. On reaching this limit, the construction materials could already been damaged, and their load carrying capacity is suddenly decreased permanently. If the system is properly designed, a local collapse should normally not be a cause of instant or gradual failure of the complete building. The ultimate failure strength of the construction elements should be carefully considered in the design of structures to prevent failure.
Źródło:
World Scientific News; 2017, 66; 97-108
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of short-term roof structure deformations using geodetic methods
Autorzy:
Woźniak, M.
Odziemczyk, W.
Jastrzębski, S.
Wojciechowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/225119.pdf
Data publikacji:
2008
Wydawca:
Politechnika Warszawska. Wydział Geodezji i Kartografii
Tematy:
deformacja konstrukcji
konstrukcja dachu
pomiary
deformation structures
roof structures
measurements
Opis:
The article contains the results of the measurements of the Warsaw University of Technology Main Hall roof deformations under various conditions. These results were obtained autornatically using precise motorized tacheometres TDA5005 and TCRP2002. In this work we compare the vertical components obtained with tacheometric measurements to the results of geometric leveling for chosen control points. The aim of this research was the assessment of the usefulness of the proposed monitoring method to determine structural deformations.
Źródło:
Reports on Geodesy; 2008, z. 1/84; 105-110
0867-3179
Pojawia się w:
Reports on Geodesy
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 665

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