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Wyszukujesz frazę "stress concentration" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Vzaimodejjstvie osesimmetrichnykh voln s tonkim krugovym uprugim vklucheniem nulevojj izgibnojj zhestkosti
Interaction axisymmetric waves with a thin circular elastic inclusion of zero flexural rigidity
Autorzy:
Shebanin, V.
Vakhonina, L.
Powiązania:
https://bibliotekanauki.pl/articles/78004.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
stress
concentration
spreading
wave
harmonic oscillation
integral equation
Opis:
The problem about axis– symmetric oscillations of the elastic isotropic medium as a result of spreading waves in it is solved. The medium contains the thin elastic circular inclusion. It is assumed, that the bent rigidity of the inclusion is so small that it can be disregarded, and the efforts calculated in the process of the solution act on the lateral edge of the inclusion. The method of the solution is based on the use of the discontinuous solution of harmonic oscillations equations for elastic medium. As a result the initial border problem is reduced to the integral equation concerning the unknown jump of tangent stresses. The integral equation was solved numerically.
Źródło:
Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 2
1730-8658
Pojawia się w:
Motrol. Motoryzacja i Energetyka Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zależność naprężenia granicznego gliny średniej od prędkości jej odkształcania
The relationship between medium clay boundary stress and its deformation rate
Autorzy:
Śnieg, M.
Powiązania:
https://bibliotekanauki.pl/articles/286541.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
gleba
zagęszczenie
naprężenie graniczne
soil
concentration
boundary stress
Opis:
Celem pracy było zbadanie wpływu prędkości odkształcania próbek glebowych na wyznaczaną wartość naprężenia granicznego gleby. Badania wykonywano w warunkach laboratoryjnych na próbkach modelowych. Ściskanie próbek prowadzono przy prędkościach: 10; 50, 100; 150; 200, 250; 300; 350; 400; 450; 500 mm*min-1. Stwierdzono, że największy przyrost wartości naprężenia granicznego występuje w zakresie prędkości odkształcania próbek od 10 do około 350 mm*min-1. Dalsze zwiększanie prędkości odkształcania, nie wpływa wyraźnie na wzrost wartości naprężenia granicznego gleby.
The purpose of the work was to examine the impact of soil sample deformation rate on soil boundary stress value being determined. The tests were carried out in laboratory conditions for model samples. Samples were put to compression at the following rates: 10; 50, 100; 150; 200, 250; 300; 350; 400; 450; 500 mm*min-1. It has been observed that highest increase in boundary stress value occurs for sample deformation rate ranging from 10 to approximately 350 mm*min-1. Further deformation rate increasing does not have significant influence on growth of soil boundary stress value.
Źródło:
Inżynieria Rolnicza; 2011, R. 15, nr 1, 1; 253-258
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of the method of application and concentration of Asahi SL on the response of cucumber plants to chilling stress
Wpływ sposobu aplikacji i stężenia Asahi SL na reakcję roślin ogórka na chłód
Autorzy:
Borowski, E.
Powiązania:
https://bibliotekanauki.pl/articles/27885.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
application method
concentration
Asahi SL preparation
plant response
cucumber plant
chilling stress
plant stress
electrolyte
proline
catalase
peroxidase
photosynthetic pigment
gas exchange
Opis:
In pot experiments conducted on cucumber cv. Śremski F1, the effect was studied of short-term chilling stress on plants which had grown from seeds germinating in the solution of Asahi SL or treated with this biostimulator during the early growth period. The plants were grown in a phytotron at an air temperature of 27/22ºC (day/night), using fluorescent light with FAR flux density of 220 μmol x m-2 x s-1 and with a photoperiod of 16/8. The biostimulator was applied using the following methods: a) germination of seeds in 0.01% and 0.05% solution, b) watering of plants twice with 0.01% or 0.05% solution, c) spraying leaves with 0.3% or 0.5% solution. Plants sprayed with distilled water were the control. After 24 hours from foliar or root application of Asahi SL, one half of the plants from each experimental series was treated for a period of 3 days at a temperature of 12/6ºC, with all the other growth conditions unchanged. The obtained results show that short-term chilling stress caused a significant increase in electrolyte leakage, free proline content and in the activity of ascorbate peroxidase in leaves, but a decrease in the content of chlorophyll, its maximum fluorescence (Fm) and quantum yield (Fv/Fm), carotenoid content, stomatal conductance, transpiration, photosynthesis, leaf biomass and in the activity of catalase in leaves. Foliar or root application of Asahi SL in the pre-stress period decreased the values of the traits which increased as a result of chilling or increased those which decreased. Higher concentrations of the biostimulator solutions, applied using this method, were more effective. The application of the biostimulator during seed germination did not result in significant changes in the response of plants to chilling stress.
Źródło:
Acta Agrobotanica; 2010, 63, 2
0065-0951
2300-357X
Pojawia się w:
Acta Agrobotanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effective parameters of tail processing gold-bearing ore hydrotransport for verninskaya processing factory
Autorzy:
Alexandrov, Victor I.
Maharatkin, Pavel N.
Trufanova, Inna S.
Powiązania:
https://bibliotekanauki.pl/articles/1917109.pdf
Data publikacji:
2020
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
hydrotransport
solid particles
concentration
shear stress
viscosity
head losses
cząstki stałe
stężenie
naprężenie ścinające
lepkość
straty ciśnienia
Opis:
Purpose: The paper shows that in order to increase the efficiency of hydraulic transport systems in mining a transition to the transportation of slurries with a high concentration of solids in the slurry flow is necessary. Design/methodology/approach: The aim of the research is to determine the optimal concentrations to ensure effectiveness of thickened tailings hydrotransport using the example of the Verninskaya processing factory, taking into account the maximum possible concentration of the solid phase and the rheological properties of the pulp. Findings: Experimental studies have shown that slurry tailings of gold-containing ore with mass concentrations of more than 55% are viscoplastic fluids. Experiments on a rotational viscometer allowed us to establish the main rheological characteristics of the studied slurries — shear stress and the dynamic effective viscosity. It has been established that over the entire range of concentrations from 55 to 65%, the flow of slurries is described by the Bingham rheological equation. Experimental studies of hydraulic transport performed on a laboratory setup with a pipeline diameter of 50 mm confirmed the results obtained on a rotational viscometer. Curves of mixture stream are inclined straight lines that cut off on the axis of head of the sections, which determine the initial hydraulic slope corresponding to the yield shear stress on the rheological curves. Originality/value: According to the results of the experiments, a method has been developed for calculating the hydraulic transport of high concentrated slurries of tailings of gold-bearing ore. Calculations showed that in a given range of performance of hydrotransport system and the mass concentration of the solid phase pressure losses vary from 11 to 84 m water column/m. Head loss values grow with increasing concentration. A sharp increase in head loss occurs in the concentration range from 60 to 65% and above.
Źródło:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2020, 145; 9-21
1641-3466
Pojawia się w:
Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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