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Wyświetlanie 1-15 z 27
Tytuł:
Note on estimating bed shear stress caused by breaking random waves
Autorzy:
Myrhaug, D.
Ong, M.C.
Powiązania:
https://bibliotekanauki.pl/articles/2078910.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
shear stress
breaking wave
surf parameter
wave height
surf zone
Opis:
This note presents a method of how the bed shear stress caused by breaking random waves on slopes can be estimated. This is obtained by adopting the Sumer et al. (2013) bed shear stress formula due to spilling and plunging breaking waves on hydraulically smooth slopes combined with the Myrhaug and Fouques (2012) joint distribution of surf similarity parameter and wave height for individual random waves in deep water. The conditional mean value of the maxima of mean bed shear stress during wave runup given wave height in deep water is provided including an example for spilling and plunging breaking random waves corresponding to typical field conditions. Another example compares the present results with one case from Thornton and Guza (1983) estimating the wave energy dissipation caused by bed shear stress beneath breaking random waves
Źródło:
Oceanologia; 2021, 63, 3; 385-390
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of two fracture models in impact simulations
Autorzy:
Fras, T.
Roth, C. C.
Mohr, D.
Powiązania:
https://bibliotekanauki.pl/articles/200605.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
armour steel
Lode angle parameter
stress triaxiality
Hosford-Coulomb model
Johnson-Cook model
Opis:
The following discussion concerns modelling of fracture in steel plates during an impact test, in which both target and striker are manufactured from the same material, high-strength high-hardness armour steel – Mars® 300. The test conditions (3 mm thick targets, projectiles with different nose shapes at impact velocity lower than 400 m/s) result in severely damaged components, which results in an analysis of stress states showing material failure. Numerical analyses are performed using two material models: the Johnson-Cook approach, as traditionally used in impact simulations, accounting for the effect of stress triaxiality, strain rate and temperature and for comparison, a simulation by means of the stress triaxiality and Lode angle parameter-dependent Hosford-Coulomb model, also incorporating the effect of the strain rate on a fracture initiation. The aim of the study is to analyse the mechanisms of penetration and perforation observed in the armour steel plates and validation of the modelling approaches.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 317-325
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The characteristics of selected triaxiality measures of the stresses for a C(T) specimen dominated by the plane strain state
Autorzy:
Graba, M.
Powiązania:
https://bibliotekanauki.pl/articles/266219.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
mechanika pękania
odkształcenie płaskie
parametry naprężeń
fracture mechanics
C(T)
FEM
stress triaxiality parameter
Lode parameter
constraints
plane strain
Opis:
The paper presents a comprehensive analysis of the stress field and selected triaxiality parameters near the crack tip for C(T) specimen dominated by the plane strain state using the finite element method. It includes some theoretical information about elastic-plastic fracture mechanics, the basics of the FEM modeling and presentation of the numerical results. The FEM analysis includes calculations with large strain assumptions. The influence of the external load and crack length is discussed. Additional elements of the paper are a qualitative assessment of the size of plastic zones and the crack tip opening displacement.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 52-74
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of linear six-parameter shell theory to the analysis of orthotropic tensegrity plate-like structures
Autorzy:
Obara, Paulina
Powiązania:
https://bibliotekanauki.pl/articles/279568.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
linear six-parameter shell theory
tensegrity plate-like structures
self-stress state
Opis:
Application of the linear six-parameter shell theory to the analysis of orthotropic tensegrity plate-like structures is proposed in the paper. A continuum model of a tensegrity plate with the self-stress state included is used. The tensegrity module, which is based on 4-strut expanded octahedron modules with additional connecting cables is proposed as an example. Different planes of support of the structures are taken into account and thus different reference surfaces of the plate model are considered. The self-stress state and some geometrical parameters are introduced for parametric analysis.
Źródło:
Journal of Theoretical and Applied Mechanics; 2019, 57, 1; 167-178
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamics of photosynthetic and oxidative stress parameters of two spinach species after short-term low UV-B radiation effect
Autorzy:
Januškaitienė, I.
Sakalauskienė, S.
Powiązania:
https://bibliotekanauki.pl/articles/12615273.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
spinach
plant species
ultraviolet radiation
radiation effect
stress parameter
Opis:
This work aimed to underline the dynamics of photosynthetic and oxidative stress parameters of ‘Matador’ and ‘Andromeda’ spinach species after short-term 1 and 2 kJm–2 UV-B radiation effect. When plants reached 3–4 leaves growths stage, the exposure to 1 kJm–2 and 2 kJm–2 UV-B radiation was done once for 68 and 136 minutes, respectively. The photosynthetic and oxidative stress parameters were determined 2, 24, 48 and 72 hours after exposure. The stimulating effect of UV-B emerged on the 3rd day after exposure. The positive effect of UV-B was more pronounced for ‘Matador’. The highest DPPH radical-scavenging capacity and the highest concentration of α-tocopherols were detected 24 hours after 2 kJ UV-B exposure, but the decrease in photosynthetic rate was the highest as well. Meanwhile, on the 3rd day after 1 kJ UV-B exposure, the indicators of oxidative stress of ‘Matador’ decreased, and the photosynthetic rate increased. This study highlights that low UV-B radiation acts as an eustress, by awaking positive changes in photosynthetic and oxidative stress parameters of spinach.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 1; 141-149
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Global stability for double-diffusive convection in a couple-stress fluid saturating a porous medium
Autorzy:
Choudhary, Shalu
-, Sunil
Powiązania:
https://bibliotekanauki.pl/articles/949858.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
couple-stress parameter
solute gradient
Brinkman number
Opis:
We show that the global non-linear stability threshold for convection in a double-diffusive couplestress fluid saturating a porous medium is exactly the same as the linear instability boundary. The optimal result is important because it shows that linearized instability theory has captured completely the physics of the onset of convection. It is also found that couple-stress fluid saturating a porous medium is thermally more stable than the ordinary viscous fluid, and the effects of couple-stress parameter (F ) , solute gradient (S f ) and Brinkman number (Da ) on the onset of convection is also analyzed.
Źródło:
Studia Geotechnica et Mechanica; 2019, 41, 1; 13-20
0137-6365
2083-831X
Pojawia się w:
Studia Geotechnica et Mechanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reducing the salinity impact on soilless culture of tomatoes using supplemental Ca and foliar micronutrients
Autorzy:
Saleh, S.
Liu, G.
Liu, M.
Liu, W.
Gruda, N.
He, H.
Powiązania:
https://bibliotekanauki.pl/articles/12688394.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
Tematy:
plant cultivation
tomato
Solanum lycopersicum
soilless culture
vegetative growth
fruit quality
yield
calcium supplementation
foliar application
foliar nutrition
micronutrient
salinity impact
salt stress
physiological parameter
Opis:
Salt stress is known as one of the most severe abiotic factors limiting the plant production all over the world. In this study, three additives: (i) supplemental Ca (5 mmol L–1) to nutrient solution, (ii) foliar application of micronutrients (Fe, Mn and Zn at 60, 160 and 110 mg L–1, respectively), and (iii) combination of both of them were evaluated aiming to reduce the negative impact of salt stress on tomato plants cultivated in a soilless culture and improve the internal quality of fruits. The obtained results show that salinity reduced vegetative growth and physiological parameters, fruit yield and its components, and even more lowered fruit market classification of tomatoes. Salinity treatment reduced most of essential macro- and micronutrients in tomato fruit, whilst Na content was increased. Tomato productivity and fruit quality were ameliorated under saline conditions by increasing Ca into nutrient solution and applying a foliar application of micronutrients. A combination of both additives ranked the first to alleviate the adverse effects of salinity on tomatoes, followed by solo supplemental Ca into saline nutrient solution. On the other hand, the internal fruit quality of antioxidant compounds, such as vitamin C, lycopene, α-carotene, β-carotene and lutein as well as acidity, total soluble solid and dry matter percent, were increased under saline conditions.
Źródło:
Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 3; 187-200
1644-0692
Pojawia się w:
Acta Scientiarum Polonorum. Hortorum Cultus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of selected parameters of photosynthesis as herbicide stress indicators on the example of glyphosate
Autorzy:
Wysocki, K.
Banaszkiewicz, T.
Olszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/65181.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
physiological parameter
photosynthesis
herbicide
ornamental plant
Mexican marigold
Tagetes erecta
plant stress
glyphosate
sublethal dose
Opis:
This study was aimed at evaluating the effect of sublethal doses of glyphosate on physiological parameters of a common ornamental plant Mexican marigold (Tagetes erecta). The herbicide was applied in the following doses: 720 g ⋅ ha–1 (standard field dose), 144 g ⋅ ha–1, 28.8 g ⋅ ha–1, and 14.4 g ⋅ ha–1, in the form of a spraying treatment of plants in a specialist spraying chamber. The net assimilation rate and leaf greenness index were then determined. Herbicide application in the sublethal doses, i.e. below 720 g ⋅ ha–1, caused disorders in both analyzed physiological parameters of plants. The glyphosate dose of 144 g ⋅ ha–1 elicited transient disorders in the leaf greenness index. In turn, the use of the lower doses (28.8 g ⋅ ha–1 and 14.4 g ⋅ ha–1) caused a short-term increase in the net photosynthesis rate in the plants which was accompanied by a decreased value of the leaf greenness index. Study results demonstrated the effect of sublethal doses of glyphosate as a stress factor in parameters associated with the process of photosynthesis in plants.
Źródło:
Journal of Plant Protection Research; 2018, 58, 3
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the parameters of geometric constraints for cracked plates under tension – three-dimensional problems
Autorzy:
Graba, M.
Powiązania:
https://bibliotekanauki.pl/articles/264715.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
CC(T)
DEN(T)
geometric constraints
stress triaxiality parameter
Q stresses
normal stresses
crack
naprężenia
pęknięcie
pękanie płyt
Opis:
This paper provides a comparative analysis of selected parameters of the geometric constraints for cracked plates subjected to tension. The results of three-dimensional numerical calculations were used to assess the distribution of these parameters around the crack front and their changes along the crack front. The study also involved considering the influence of the external load on the averaged values of the parameters of the geometric constraints as well as the relationship between the material constants and the level of the geometric constraints contributing to the actual fracture toughness for certain geometries.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 901-919
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transport of MHD couple stress fluid through peristalsis in a porous medium under the influence of heat transfer and slip effects
Autorzy:
Sankad, G. C.
Nagathan, P. S.
Powiązania:
https://bibliotekanauki.pl/articles/266102.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
peristaltic flow
couple stress fluid
Darcy number
slip parameter
compliant walls
przepływ perystaltyczny
liczba Darcy'ego
parametr poślizgu
Opis:
An attempt has been made to examine the effects of magnetohydrodynamic couple stress fluid in peristaltic flow with porous medium under the impact of slip, heat transfer and wall properties. The expressions are obtained for temperature, coefficient of heat transfer and velocity. Influences of different parameters, the Hartmann number, Brinkman number and adaptability parameters on the temperature and warmth trade coefficient are discussed through outlines.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 2; 403-414
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation of plastic forming and structure formation parameters in powder materials
Vzaimosvjaz parametrov plasticheskogo deformirovanija i strukturoobrazovanija v poroshkovykh materialakh
Autorzy:
Ryabicheva, L.
Usatyuk, D.
Nikitin, Y.
Powiązania:
https://bibliotekanauki.pl/articles/793691.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
mathematical model
recovery
recrystallization
polygonization
deformation parameter
axial stress logarithm
activation energy
softening
plastic forming
powder material
theoretical analysis
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 4
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ecophysiological and biochemical changes in Abelmoschus esculentus (L.) Moench under chromium stress
Autorzy:
Unnikannan, P.
Vedhanarayanan, P.
Sundaramoorthy, P.
Powiązania:
https://bibliotekanauki.pl/articles/10841.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
ecophysiological change
biochemical change
Abelmoschus esculentus
bhendi
chlorophyll content
mineral nutrient
chromium stress
biochemical parameter
Opis:
Increasing concentrations of chromium caused reduction in growth, chlorophyll contents and mineral mutrients of bhendhi. At increasing concentrations of chromium, all the attributes were found to be reduced. Chromium is one of the toxic elements discharging from tannery industry. The long disposal of tannery effluent to the agricultural land causes serious damages in the soil texture; reduce the growth of microorganisms and agricultural crops. Large areas of Vellore district of Tamilnadu was seriously affected by the tannery effluent irrigation to the agricultural land. The present study was conducted to identify the phytotoxic effect and physiological changes of Abelmoschus esculentus (L.) Moench under the treatment of different concentrations of chromium solutions (2.5, 5, 10, 25, 50, 75 and 100 mg/l). The result shows that there was a gradual reduction in the morphological parameters (root length, shoot length, fresh weight and dry weight). Similarly the photosynthetic pigments (Chlorophyll and carotenoid) and biochemical parameters such as protein, amino acid, and sugars were also gradually decreased with increasing concentrations of chromium.
Źródło:
International Letters of Natural Sciences; 2014, 02
2300-9675
Pojawia się w:
International Letters of Natural Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Helical gear train load capacity criterion
Kriterijj hagruzochnojj sposobnosti zubchatykh vintovykh peredach
Autorzy:
Nosko, P.
Shyshov, V.
Ratov, D.
Fil, P.
Lysenko, A.
Powiązania:
https://bibliotekanauki.pl/articles/793475.pdf
Data publikacji:
2014
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
helical gear
tightness
load capacity criterion
transmission
performance
stress distribution
geometrical parameter
mathematical model
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2014, 14, 1
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of glueline parameters on the mechanical behaviour of CFRP reinforced wood - numerical analysis
Wpływ parametrów spoiny klejowej na pracę drewna wzmocnionego taśmą CFRP - analiza numeryczna
Autorzy:
Burawska, I.
Tarasovs, S.
Powiązania:
https://bibliotekanauki.pl/articles/8182.pdf
Data publikacji:
2014
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
glue line
mechanical parameter
mechanical behaviour
CFRP tape zob.carbon fibre reinforced polymer
carbon fibre reinforced polymer
wood
numerical analysis
stress distribution
reinforcement
Źródło:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2014, 87
1898-5912
Pojawia się w:
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of physiological parameters to evaluate in vitro selected Alyssum lines
Autorzy:
Hanus-Fajerska, E.
Muszynska, E.
Kozminska, A.
Kolton, A.
Augustynowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/80490.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
plant cell
metabolism
heavy metal
stress
Alyssum montanum
physiological parameter
micropropagation
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 27

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