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Tytuł:
Zastosowanie betonów lekkich do konstrukcji budowlanych, w szczególności do sprężonych płyt stropowych
Application of lightweight concrete to construction, especially for prestressed flor slabs
Autorzy:
Mieszczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/134748.pdf
Data publikacji:
2016
Wydawca:
ADVSEO
Tematy:
lightweight concrete
elastic modulus
prestress
Opis:
Today's race for innovation and new solutions require from engineers to create new design solutions. One of these innovate solutions could be the using of lightweight concrete for structures subjected to high loads. Lightweight concrete despite smaller and above all worse aggregates have very good mechanical properties. Much less dead weight could lead to significant savings in the amount of reinforcement or massiveness of supports and foundations. The work has shown the possibility of using lightweight concrete for prestressed structures, based on a review of studies of lightweight concrete and numerical calculations.
Źródło:
Technical Issues; 2016, 4; 55-61
2392-3954
Pojawia się w:
Technical Issues
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New Dynamic Method for Examination of Elastic Properties of Thin Wire Samples
Autorzy:
KVETAN, Karol
KUBLIHA, Marian
OŽVOLDOVÁ, Miroslava
BOŠÁK, Ondrej
NAĎ, Milan
KOTIANOVÁ, Janette
Powiązania:
https://bibliotekanauki.pl/articles/455675.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Rzeszowski
Tematy:
elastic modulus
connected reverse pendulums
thin wire samples
Opis:
Classical reverse pendulums are currently used for measuring the gravity acceleration g, or – when pendulums bodies are connected by the spring – for demonstration of composition of parallel vibrations. In this paper we present the reversed pendulums in „non-traditional” position – as a device for measuring of elastic modulus of wire samples. The connection is realized by the measured wire sample with the circle shape.
Źródło:
Edukacja-Technika-Informatyka; 2015, 6, 2; 179-185
2080-9069
Pojawia się w:
Edukacja-Technika-Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of starch type and screw speed on mechanical properties of extrusion-cooked starch-based foams
Autorzy:
Combrzyński, M.
Wojtowicz, A.
Mitrus, M.
Oniszczuk, T.
Matwijczuk, A.
Pawelczyk, P.
Mościcki, L.
Powiązania:
https://bibliotekanauki.pl/articles/2082504.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
corn starch
potato starch
foams
compression
test
elastic modulus
Opis:
Potato starch and corn starch are popular basic raw materials in the processing of biopolymers. One of the processing methods employed in the manufacture of biopolymers is extrusion-cooking technique. With specific parameters and equipment configurations, it is possible to obtain a wide variety of starch-based biopolymers. Loose fill foams are usually produced with the use of polystyrene, but the adverse environmental effects of conventional plastics provide an incentive for the development of new, environmentally friendly raw materials. The aim of the study was to apply the extrusion-cooking technique to prepare starch-based foams from potato starch and corn starch under various extruder screw speeds applied during processing. Process efficiency and energy consumption were also tested during processing. The expanded foams were analysed by means of cutting and compression tests to evaluate selected mechanical properties. The type of starch used and the processing screw speed had an impact on the efficiency and specific energy requirements of the process. The results showed that the screw speed had a significant effect on the cutting forces in the tested foams as well as on its compression properties. Higher hardness of foams was observed when potato starch was used as the basic raw material. Moreover, corn starch foams proved to be more elastic in compression tests.
Źródło:
International Agrophysics; 2019, 33, 2; 233-240
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Test and Analysis of Strength of Bamboo Curtain Plywood Based on Free Vibration Modal Method
Autorzy:
Gu, Xiaoyu
Zhou, Aijin
Adjei, Patrick
Zhang, Rongzhuo
Zhou, Yuhao
Wang, Zheng
Powiązania:
https://bibliotekanauki.pl/articles/29433299.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:
bamboo wood
plywood
elastic modulus
shear modulus
Poisson's ratio
dynamic test
Opis:
Bamboo curtain plywood is made of equal-thickness slotted bamboo slivers as its constituent units and is formed into boards with high pressure. In this paper, rectangular plates, beam specimens, and two sizes of square plates were tested to determine the elastic modulus and shear modulus of bamboo curtain plywood quickly, easily, and accurately. The free square board torsional vibration method was used to test the shear modulus of the square plates. The dynamic test results were also verified by means of the static four-point bending method. The main conclusions show that the dynamic elastic modulus, shear modulus and Poisson's ratio of this bamboo curtain plywood are 0.7 GPa, 1300 MPa and 0.12, respectively. The values of the elastic constants of these bamboo curtain plywood specimens measured by dynamic and static methods are consistent, and this dynamic test method has the advantages of fast, easy, good repeatability and high accuracy.
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2023, 66, 212; Art. no. 176766
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The elastic undrained modulus Eu50 for stiff consolidated clays related to the concept of stress history and normalized soil properties
Autorzy:
Stróżyk, J.
Tankiewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/178538.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
consolidated clays
stress history
normalised elastic modulus
triaxial test
Opis:
The paper presents the results of a triaxial test conducted on stiff, consolidated clays. The standard TXCIU procedure (isotropic consolidation and undrained shearing) was applied in the laboratory soil tests. The undrained elastic modulus Eu50 was de- termined from each test. The Eu50 values were determined for soil samples cut out from different depths and tested under different confining pressures. There was a significant scatter of values with depth, and no relationships between Eu50 modules or other geotechnical parameters (e.g., cu) were observed. This work presents the concept of normalization of Eu50 modulus values using modified normalization SHANSEP (Stress History And Normalized Soil Engineering Properties). This method was first proposed for estimating the value of the undrained shear strength cu normalizing the parameter relative to the in situ effective vertical stress σ vo and loading history (overconsolidation stress σ p and overconsolidation ratio OCR) of the soil. The study demonstrated that the concept of normalization of soil properties can also be used for testing elastic modulus Eu50 of con- solidated natural clays and normalized values of geotechnical parameters taking into account the state of stress and load history can be correlated with the value of the overburden pressure.
Źródło:
Studia Geotechnica et Mechanica; 2016, 38, 3; 67-72
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structural and mechanical properties of boron nitride thin films deposited on steel substrates by pulsed laser deposition
Autorzy:
Gocman, K.
Kałdoński, T.
Mróz, W.
Burdyńska, S.
Prokopiuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/244608.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
boron nitride
pulsed laser deposition
nanohardness
elastic modulus
critical load
Opis:
The article presents preliminary results of investigation on structure, morphology and mechanical properties of boron nitride thin films prepared by pulsed laser deposition on various steel substrates. In order to improve adhesion and reduce internal stresses, substrates were subjected to gas nitriding. To increase gas ionization in the chamber and provide the deposited particles with higher energy RF discharge generator was used. Structure and morphology of coatings were examined by atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). Mechanical properties like nanohardness (sclerometric) and elastic modulus (using approach curves) were characterized by UNMT. Adhesion of coatings was measured by scratch tests; critical load was determined on the basis of microscopic observation and friction force and acoustic emission runs. On the basis of obtained results, possibility of using steel as substrate for BN thin films deposition was confirmed. Stable, crystalline, multiphase coatings with good adhesion to the steel substrate were obtained. It was also proved that mechanical properties of prepared coatings and their adhesion to the substrates strongly depend on the type of the substrate. In the next stage tribological properties of BN, coatings will be examined in particular in terms of wear resistance and friction coefficient between coatings and steel.
Źródło:
Journal of KONES; 2011, 18, 1; 149-156
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic mechanical characterization of epoxy composite reinforced with areca nut husk fiber
Autorzy:
Muralidhar, N.
Kaliveeran, Vadivuchezhian
Arumugam, V.
Srinivasula Reddy, I.
Powiązania:
https://bibliotekanauki.pl/articles/139576.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
areca nut husk fiber
dynamic mechanical analysis
storage modulus
loss modulus
elastic modulus
damping factor
Opis:
Natural fiber polymer composites are gaining focus as low cost and light weight composite material due to the availability and ecofriendly nature of the natural fiber. Fiber composites are widely used in civil engineering, marine and aerospace industries where dynamic loads and environmental loads persist. Dynamic analysis of these composites under different loading and environmental conditions is essential before their usage. The present study focuses on the dynamic behavior of areca nut husk reinforced epoxy composites under different loading frequencies (5 Hz, 10 Hz and 15 Hz) and different temperatures (ranging from 28◦C to 120◦C). The effect of loading and temperature on storage modulus, loss modulus and glass transition temperature was analyzed. Increase in storage modulus is observed with increase in loading frequency. The storage modulus decreases with increase in temperature. The glass transition temperature of the composite is determined to be 105◦C. The elastic modulus calculated from the DMA data is compared with three point bending test
Źródło:
Archive of Mechanical Engineering; 2020, LXVII, 1; 57-72
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Structure on Physicomechanical Properties of Transition Metals Diboride Films
Autorzy:
Goncharov, A.
Yunda, A.
Komsta, H.
Rogalski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1033745.pdf
Data publikacji:
2017-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
transition metal diborides
nanocomposite coating
magnetron sputtering
structural state
hardness
elastic modulus
Opis:
Research of the effect of structure on composition and physicomechanical properties of transition metals diboride films deposited by RF-magnetron sputtering was carried out. It was shown that there is a wide range of different structures, from amorphous to nanocrystalline one with 1-40 nm nanocrystallite sizes in the case of transition metals diboride films. The correlation between the structure, composition, and physicomechanical properties of transition metals diboride films was established.
Źródło:
Acta Physica Polonica A; 2017, 132, 2; 270-273
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomechanical characterization by estimating the Vp/Vs ratio of sedimentary rock samples
Autorzy:
Matuła, Rafał
Lewandowska-Śmierzchalska, Joanna
Fąfara, Zbigniew
Powiązania:
https://bibliotekanauki.pl/articles/1403638.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Vp /Vs ratio
ultrasonic measurements
geomechanical parameters
elastic modulus
seismic body waves
Opis:
The velocity ratio Vp/Vs and elastic parameters are effective quantities for describing various physical parameters and lithological properties of rock samples. Ultrasonic measurement was used to evaluate the Vp/Vs ratio. Ultrasonic velocity estimation is widely used in the quantitative evaluation of rock materials. Ultrasonic P and S-wave travel times were studied in one direction of cylindrical core samples with a length and diameter of 100 mm. Wave velocity analysis was carried out on 20 crystalline drill cores taken at depths ranging from 10 m to 80 m. The cores were then tested for their ultrasonic velocity. The studied samples were also geomechanically characterized using ultrasonic testing. In this paper, the method used and a brief description of the measurement geometry are presented. The results of the calculations of P and S wave velocities, Vp/Vs ratio, Young’s modulus and Poisson’s coefficient are given. Finally, the studied samples were geologically classified and the Vp/Vs ratio was discussed.
Źródło:
AGH Drilling, Oil, Gas; 2019, 36, 3; 5-14
2299-4157
2300-7052
Pojawia się w:
AGH Drilling, Oil, Gas
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chronic and acute pancreatitis elastography – current knowledge
Elastografia w przewlekłym i ostrym zapaleniu trzustki – aktualna wiedza
Autorzy:
Sepioł, Agnieszka M.
Cebula, Maciej M.
Powiązania:
https://bibliotekanauki.pl/articles/2206392.pdf
Data publikacji:
2023-06-22
Wydawca:
Śląski Uniwersytet Medyczny w Katowicach
Tematy:
pancreatitis
elasticity imaging techniques
elastic modulus
zapalenie trzustki
techniki obrazowania elastyczności
moduł sprężystości
Opis:
This paper is a review of available studies concerning the topic of ultrasound elastography as a modality for diagnosing chronic or acute pancreatitis. Twenty-eight articles published between 2004 and 2022 containing keywords related to elastography and acute and chronic pancreatitis were reviewed using databases and search engines such as PubMed, Scopus, Google Scholar and Web of Science. Acute and chronic pancreatitis increase the stiffness of the pancreatic parenchyma, which can be measured using strain or shear wave elastography. Numerous studies have shown promising results, and it seems that it is possible to use elastography as a routine technique in the diagnosis of chronic or acute pancreatitis. Nevertheless, certain limitations such as age or body weight, should be considered when performing elastography.
Niniejsza praca stanowi przegląd dostępnych badań dotyczących elastografii ultrasonograficznej jako metody diagnostyki przewlekłego lub ostrego zapalenia trzustki. Dokonano przeglądu dwudziestu ośmiu artykułów opublikowanych w latach 2004–2022, zawierających słowa kluczowe związane z elastografią oraz ostrym i przewlekłym zapaleniem trzustki, z wykorzystaniem baz i wyszukiwarek takich jak PubMed, Scopus, Google Scholar i Web of Science. Ostre i przewlekłe zapalenie trzustki powoduje zwiększenie sztywności miąższu trzustki, co można zmierzyć za pomocą elastografii odkształceniowej lub fali poprzecznej. Liczne badania przyniosły obiecujące wyniki i wydaje się, że możliwe jest zastosowanie elastografii jako rutynowej techniki w diagnostyce przewlekłego lub ostrego zapalenia trzustki. Niemniej jednak podczas wykonywania elastografii należy wziąć pod uwagę pewne ograniczenia, takie jak wiek czy masa ciała.
Źródło:
Annales Academiae Medicae Silesiensis; 2023, 77, 1; 82-86
1734-025X
Pojawia się w:
Annales Academiae Medicae Silesiensis
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 42

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