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Tytuł:
Fatigue strength of ribbed reinforcing bars made of the B500SP steel
Wytrzymałość zmęczeniowa prętów żebrowanych ze stali B500SP
Autorzy:
Szlachetka, O.
Dohojda, M.
Mazurczuk, R.
Lusawa, M.
Powiązania:
https://bibliotekanauki.pl/articles/971822.pdf
Data publikacji:
2017
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
fatigue strength
ribbed reinforcing bar
reinforcing bar
steel bar
Źródło:
Acta Scientiarum Polonorum. Architectura; 2017, 16, 1
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biomechanical Assessment of Three Rebar Tying Techniques
Autorzy:
Albers, J. T.
Hudock, S. D.
Powiązania:
https://bibliotekanauki.pl/articles/90340.pdf
Data publikacji:
2007
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
construction
biomechanics
reinforcing ironwork
Opis:
The National Institute for Occupational Safety and Health (NIOSH) conducted a study of ironworkers to evaluate their risk for developing back and hand injuries from hand-tying reinforcing steel bar and to investigate whether power tying tools can be an effective intervention for the prevention of work-related musculoskeletal disorders. A field investigation of biomechanical loading when using 3 techniques to tie together rebar was conducted. Researchers measured employees’ wrist and forearm movement with goniometers and videotaped and analyzed trunk postures. Manually tying rebar at ground level involved sustained deep trunk bending and rapid, repetitive, and forceful hand–wrist and forearm movements. Using a power tier significantly reduced the hand–wrist and forearm movements and allowed the ironworkers to use one free hand to support their trunk posture while tying. Adding an extension handle to the power tier allowed the ironworkers to tie rebar while standing erect, minimizing sustained trunk flexion.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2007, 13, 3; 279-289
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Anchorage systems in FRP - strengthened reinforced concrete
Autorzy:
Tworzewski, P.
Bacharz, K.
Michałowska-Maziejuk, D.
Powiązania:
https://bibliotekanauki.pl/articles/105140.pdf
Data publikacji:
2018
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
reinforcing
strengthening
FRP
anchorage systems
failure modes
Opis:
The main aim of this article was to present recently evolved methods of strengthening flexural reinforced concrete beams, as well as the concreteanchorage system bond strength problems in composites that were either surface mounted or inserted in the pre-cut grooves in the concrete cover. The focus is on the beams strengthened with the carbon FRP (CFRP - carbon fiber reinforced polymer) composites to show the basic advantages and drawbacks associated with their installation and bond performance. Domestic and foreign experiments investigating the EBR and NSMR strengthening systems were discussed to show their efficacy, common failure modes and the factors initiating the debonding process. Debonding problems and solutions to those problems were illustrated using the example of a composite material attached to the outer surface of concrete in the shear zone of reinforced concrete beams The article provides guidelines for checking the anchorage capacity for the existing longitudinal reinforcement with the simultaneous action of bending moment and shear force in the support zone of the reinforced concrete beam.
Źródło:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2018, 65, 3; 101-110
2300-5130
2300-8903
Pojawia się w:
Czasopismo Inżynierii Lądowej, Środowiska i Architektury
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of granularity of reinforcing particles Al2O3 on EDM process of aluminium matrix composites
Autorzy:
Perończyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/99521.pdf
Data publikacji:
2012
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
aluminium composites
reinforcing phase
electro-discharge machining
Opis:
The study discusses issues related to the process of electro-discharge machining (EDM) composites based on Al + 20% Si + 5% Fe + 3% Cu + 1% Mg matrix manufactured using a powder metallurgy method. Ten percent by volume of Al2O3 grains of 3, 9, 23 and 53?m sizes with irregular sharp edges represented the reinforcing phase. EDM was performed with a machine equipped with a RLC generator using different (computational) discharge energies varied in steps within the 0.044 - 2.268 mJ range. The tests measured volumetric productivity of EDM (Vw) and roughness (Ra) of the machined surface. In addition, the researchers provided selected SEM images of ED-machined surfaces with some results of X-ray microanalyses of chemical composition performed in cavities and on the surfaces of irregularities. They also provided SEM images of Al2O3 grains adhering to the machined surface of the composite, showing the mechanism of erosion of dielectric particles in EDM conditions. They demonstrated that the energy of single discharges (Ei) was the main parameter effecting the process and results of EDM. The volumetric productivity of the process (Vw) and roughness of the machined surface (Ra) increase with growth of energy (Ei) and, at the same time, surface integrity (SI) changes.
Źródło:
Journal of Machine Engineering; 2012, 12, 2; 67-76
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Education of Logisticians in Poland: Problems and Prospects in Students’ Opinion
Autorzy:
Pawłyszyn, Irena
Rizun, Nina
Ryzhkova, Halina
Powiązania:
https://bibliotekanauki.pl/articles/504078.pdf
Data publikacji:
2019
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
railway track
engineering facility
transition zone
reinforcing inserts.
Opis:
Logistics is one of the key sectors of the Polish economy. Its value reflects not only its own capacity, but also the role it plays in ensuring the proper functioning of the entire economy. The rapid development of the industry and the highest demands on logistics solutions bring to the fore the problem of preparing a new generation of specialists in logistics. That is why the question of compliance to learning expectations of both students and the labour logistics market is so important, as well as the problems of efficiency and adequacy of training provided to students with the knowledge and skills to achieve the desired job, and the opportunities of Polish Universities’ graduates to work abroad. The objective of the paper was to identify the expectations of students who study Logistics at the Faculty of Engineering Management, Poznan University of Technology.
Źródło:
Logistics and Transport; 2019, 44, 4; 95-104
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ways of Eliminating the Road Effect in Transition Zones from the Railway Track to Bridge Structures
Autorzy:
Zamiar, Zenon
Surowiecki, Andrzej
Saska, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/503870.pdf
Data publikacji:
2019
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
railway track
engineering facility
transition zone
reinforcing inserts
Opis:
Selected methods of constructing special inserts in the transition zones between the embankment of the railway track and the engineering object (bridge, viaduct, or culvert) were discussed. The purpose of mounting the designed inserts is to eliminate the so-called threshold effect, i.e. continuously creating a mild change in the stiffness of the ground under the track. In addition to the solutions presented in practice, attention was also paid to projects developed by the authors of this article. T
Źródło:
Logistics and Transport; 2019, 44, 4; 85-93
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Analysis of the Features of Cast Composite Materials Based on Light Alloys Reinforced by Particles
Autorzy:
Dan, Olena
Powiązania:
https://bibliotekanauki.pl/articles/2056036.pdf
Data publikacji:
2022
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
aluminium
magnesium
alloy
composite material
matrix
reinforcing particles
Opis:
Light alloys are widely used in industry and everyday life due to their high physical and mechanical properties, wear and corrosion resistance, as well as low cost. In this regard, the use of light alloys as a basis for composite materials is both justified and expedient. The potential of these materials has not been fully used to this day, despite the growing interest in metal matrix composites and extensive investigations aimed at the development of production technology and the introduction of advanced systems based on light matrices. The article presents a short review of the analysis of the main components of the technology of cast composite materials based on light alloys of aluminum and magnesium reinforced by particles. Particular attention is paid to the choice of the matrix alloy, the type, size and amount of reinforcing particles introduced into it, as well as the thermal-time and kinetic parameters of the process.
Źródło:
Journal of Casting & Materials Engineering; 2022, 6, 1; 8--13
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the forced movement of components on the structure in fabricated AlSi/CrxCy composite castings
Autorzy:
Dulęba, A.
Cholewa, M.
Scelina, D.
Powiązania:
https://bibliotekanauki.pl/articles/382394.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dyfuzja
kompozyty
faza umacniająca
diffusion
composites
reinforcing phase
Opis:
Fabrication and microstructure of the AlSi11 matrix composite containing 10 % volume fraction of CrFe30C8 particles were presented in this paper. Composite suspension was manufactured by using mechanical stirring. During stirring process the temperature of liquid metal, time of mixing and rotational speed of mixer were fixed. After stirring process composite suspension was gravity cast into shell mould. The composites were cast, applying simultaneously an electromagnetic field. The aim of the present study was to determine the effect of changes in the frequency of the current power inductor on the morphology of the reinforcing phase in the aluminum matrix. The concept is based on the assumption that a chromium-iron matrix of CrFe30C8 particles dissolves and residual carbide phases will substantially strengthen the composite. The microstructure and interface structure of the AlSi11/CrFe30C8 composite has been studied by optical microscopy, scanning microscopy and X-ray diffraction.
Źródło:
Archives of Foundry Engineering; 2012, 12, 1; 25-32
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Development of Bike-Sharing Systems in Poland. The Study of Wavelo System in Kraków
Autorzy:
Świgost-Kapocsi, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/503984.pdf
Data publikacji:
2019
Wydawca:
Międzynarodowa Wyższa Szkoła Logistyki i Transportu
Tematy:
railway track
engineering facility
transition zone
reinforcing inserts
Opis:
The interest in bike transport in Polish cities and towns has been growing systematically in the recent years. A great number of local authorities take various actions to support the development of cycling systems. They make an effort to develop a cycling infrastructure – bike lanes, Bike&Ride type of parking, bike stands and advanced stop lines. An increased interest in bike-sharing systems is visible as well. Apart from that, the authorities implement policies and take other actions which make cycling in a city more convenient. The aim of the article is to characterize the experience of Polish cities in the area of bike transport support, with a special attention to bike-sharing systems. The article presents a comparison of 38 city bike systems. In addition, the Wavelo system in Kraków was studied in detail. Wavelo city bike system is very popular among citizens of Kraków. Despite relatively high prices and the lack of free minutes, the number of system users is growing. A large number of docking stations and their locations make bikes more accessible to citizens. Moreover, Kraków's authorities take action to develop a proper bike infrastructure which increases the interest in cycling as a transportation system. Selected methods of constructing special inserts in the transition zones between the embankment of the railway track and the engineering object (bridge, viaduct, or culvert) were discussed. The purpose of mounting the designed inserts is to eliminate the so-called threshold effect, i.e. continuously creating a mild change in the stiffness of the ground under the track. In addition to the solutions presented in practice, attention was also paid to projects developed by the authors of this article. The results of experimental research constituting the basis for the development of some solutions are also given.
Źródło:
Logistics and Transport; 2019, 44, 4; 69-76
1734-2015
Pojawia się w:
Logistics and Transport
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tribological characterization of high porosity aluminum based composite materials
Autorzy:
Stanev, L.
Kolev, M.
Yotov, A.
Drenchev, B.
Drenchev, L.
Powiązania:
https://bibliotekanauki.pl/articles/391856.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
Tematy:
aluminum based composite materials
tribological properties
fly ash
reinforcing phase
Opis:
The present work aims to study the effect of the reinforcing phase on dynamic coefficient of friction and mass wear of specimen with different compositions under various friction conditions. Porous materials with different compositions and reinforcing phase are obtained by replication method applying salt (NaCl) space holder. The reinforcing phase is Fly Ash (FA) particles. The microstructure of the obtained materials is observed and the tribological properties such as mass losses and the dynamic coefficient of friction are determined. A comparison of the tribological properties between nominally nonporous matrix, porous matrix and porous composite are presented in this study.
Źródło:
Prace Instytutu Odlewnictwa; 2017, 57, 4; 363-367
1899-2439
Pojawia się w:
Prace Instytutu Odlewnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nanocellulose as a new sustainable material for various applications: a review
Autorzy:
Fahma, F.
Febiyanti, I.
Lisdayana, N.
Arnata, I.W.
Sartika, D.
Powiązania:
https://bibliotekanauki.pl/articles/2175774.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
nanocellulose
nanocomposites
nanofiller
reinforcing agent
surface modification
nanoceluloza
nanokompozyty
nanonapełniacz
środek wzmacniający
modyfikacja powierzchni
Opis:
Purpose: This paper presents a comprehensive review of nanocellulose and its application in several applications, including composites, biomedical, and food packaging fields. Design/methodology/approach: General explanations about cellulose and nanocellulose have been described. Different types of nanocellulose (cellulose nanofibers, cellulose nanocrystals, bacterial nanocellulose) as well as their isolation processes (mechanical process, chemical process) have been reviewed. Several surface modifications have been explained to improve the dispersion of nanocellulose in non-polar polymers. The possible utilization of nanocellulose in composites, biomedical, and food packaging fields have also been analysed. Findings: This review presents three application fields at once, namely composites, biomedical, and food packaging fields. In the composite field, nanocellulose can be used as a reinforcing agent which increases the mehcnical properties such as tensile strength and toughness, and thermal stability of the final composites. In the biomedical field, nanocellulose is reinforced into hydrogel or composites which will be produced as tissue scaffolding, wound dressing, etc. It is found that the addition of nanocellulose can extend and control the drug release. While in the packaging field, nanocellulose is added into a biopolymer to improve the barrier properties and decrease the water and oxygen vapor transmission rates. Research limitations/implications: Nanocellulose has a hydrophilic nature, thus making it agglomerated and difficult to disperse in most non-polar polymers. Therefore, certain surface modification of nanocellulose are required prior to the preparation of composites or hydrogels. Practical implications: Further research regarding the toxicity of nanocellulose needs to be investigated, especially when applying it in the biomedical and food packaging fields. Originality/value: This review presents three application fields at once, namely composites, biomedical, and food packaging fields.
Źródło:
Archives of Materials Science and Engineering; 2021, 109, 2; 49--64
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specifics of physico-mechanical characteristics of thermally-hardened rebar
Autorzy:
Kopiika, Nadiia
Selejdak, Jacek
Blikharskyy, Yaroslav
Powiązania:
https://bibliotekanauki.pl/articles/23966584.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
wzmocnienie termiczne
stal zbrojeniowa
konstrukcje żelbetowe
hartowanie
thermal strengthening
reinforcing steel
reinforced concrete structures
hardening
Opis:
Thermal hardening is widely used nowadays for modification of steel bar properties and obtaining effective reinforcing material. Strength and deformation characteristics of thermally hardened reinforcement is the complex indicator of reinforcement efficiency. Therefore, reliable assessment of physico-mechanical characteristics of thermally hardened rebar is topical and important issue. This article is intended to the analysis of physico-mechanical characteristics of thermally hardened rebar on the basis of experimental data. Thorough statistical processing of experimental data was made and specific features of strength parameters were identified. Analytical model of strength characteristics is proposed, which enables to take into account inhomogeneous strength properties of the rebar along its cross-section. It could be stated that assessment of physico-mechanical characteristics of thermally hardened rebar is topical and important issue, which is the prospective area of further research.
Źródło:
Production Engineering Archives; 2022, 28, 1; 73--81
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of reinforcing particles in the pressure die cast AlSi11/20% SiC composite
Rozmieszczenie cząstek fazy zbrojącej w odlewanym ciśnieniowo kompozycie AlSi11/20% SiC
Autorzy:
Pasieka, A.
Konopka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/354366.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metal matrix composites
pressure die casting
reinforcing particles distribution
kompozyty metalowe
odlewnictwo ciśnieniowe
rozmieszczenie cząstek
Opis:
A method of pressure die casting of composites with AlSi11 alloy matrix reinforced with 20 vol. % of SiC particles and the analysis of the distribution of particles within the matrix are presented. The composite castings were produced at various values of the piston velocity in the second stage of injection, at diverse intensification pressure values, and various injection gate width values. The distribution of particles over the entire cross-section of the tensile specimen is shown. The index of distribution was determined on the basis of particle count in elementary measuring fields. The regression equation describing the change of the considered index was found as a function of the pressure die casting parameters. The conclusion presents an analysis of the obtained results and their interpretation.
Przedstawiono metodykę odlewania ciśnieniowego kompozytów na osnowie stopu AlSi11 zbrojonego 20% udziałem objętościowym cząstek SiC i ich rozmieszczenia w osnowie. Odlewy kompozytowe wykonano przy różnych wielkościach prędkości tłoka w II fazie ruchu, ciśnieniu doprasowania i szerokości szczeliny wlewowej. Przedstawiono rozmieszczenie cząstek SiC na całym przekroju odlewu próbki do badania rozciągania. Na podstawie zliczeń liczby cząstek w elementarnych polach pomiarowych określono wskaźnik ich rozmieszczenia. Obliczono równanie regresji zmiany tego wskaźnika jako funkcję parametrów odlewania ciśnieniowego. W podsumowaniu przedstawiono analizę uzyskanych wyników i ich interpretację.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 2; 767-770
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Efficiency for Reinforcing Steel Activities in The Construction of a Business Complex in Mexico
Wydajność energetyczna wykorzystania stali zbrojeniowej podczas budowy kompleksu biznesowego w Meksyku
Autorzy:
ESQUER, Javier
MORALES-SAU, Jorge Rafael
VELAZQUEZ, Luis E.
ALVARADO-IBARRA, Juana
MUNGUIA, Nora Elba
Powiązania:
https://bibliotekanauki.pl/articles/435055.pdf
Data publikacji:
2017-12-31
Wydawca:
Uniwersytet Opolski
Tematy:
Construction
energy efficiency
environment
sustainability
reinforcing steel
Mexico
budowa
wydajność energetyczna
środowisko
podtrzymywalność
stal zbrojeniowa
Meksyk
Opis:
Much of the energy used in the world is associated with the construction sector, and one of the ways to reduce that energy consumption is to do each constructive process in an energetically efficient way. The aim of this paper is to present results from an energy efficiency program in the construction of a business complex in Hermosillo, Mexico, particularly in the processes of reinforcing steel activities (rebar). Results reveal that appropriate use of equipment and the coordination between engineers and workers help to improve the energy efficiency during the construction phase also reducing material waste. Additionally, attaching the energy efficiency approach to the cleaner production framework is a complicated task due to energy inefficiencies are not easily identified and estimated. Since there is less energy consumption in construction process along the life cycle of buildings compared to operation activities, there is little evidence on energy efficiency studies in that part of the process. Therefore, this paper intends to provide experiences to construction experts in order to have better basis for decisions related to energy efficiency in this industry.
Duża część konsumpcji energii na świecie przypada na sektor budowlany, a jedną z metod redukcji tego zużycia jest przeprowadzenie każdego procesu budowlanego w sposób wydajny energetycznie. Celem artykułu jest przedstawienie wyników programu na rzecz wydajności energetycznej związanego z budową kompleksu biznesowego w Hermosillo w Meksyku, a zwłaszcza z użyciem stali zbrojeniowej (prętów zbrojeniowych). Wyniki wskazują, że właściwe wykorzystanie sprzętu oraz koordynacja pomiędzy inżynierami i pracownikami pomaga poprawić wydajność energetyczną w fazie budowy oraz ograniczyć odpady. Co więcej, włączenie podejścia opartego na wydajności energetycznej w ogólne podstawy czystszej produkcji jest skomplikowanym zadaniem z tego powodu, że niewydajność energetyczna jest trudna do zidentyfikowania i oszacowania. Dlatego też mniejsza konsumpcja energii w procesie budowlanym w całym cyklu życia budynków w porównaniu do działalności produkcyjnej nie odzwierciedla się w dowodach w postaci badań nad wydajnością energetyczną w tej części procesu. Niniejszy artykuł ma na celu zaprezentowanie doświadczenia ekspertów budowlanych, aby wesprzeć proces decyzyjny związany z wydajnością energetyczną w analizowanym przemyśle.
Źródło:
Economic and Environmental Studies; 2017, 17, 44; 637-650
1642-2597
2081-8319
Pojawia się w:
Economic and Environmental Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Researches of production of the spatially reinforced carbon-carbon composition
Issledovanija proizvodstva prostranstvenno armorovannykh uchlerod-uglerodnykh kompozitov
Autorzy:
Chesnokov, O.
Powiązania:
https://bibliotekanauki.pl/articles/793043.pdf
Data publikacji:
2012
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
carbon-carbon composition
technological manufacture preparation
reinforcing fibre
theoretical investigation
experimental investigation
technological process
control system
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2012, 12, 3
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
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