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    Wyświetlanie 1-4 z 4
    Tytuł:
    Mathematical model of Coriolis effect
    Model matematyczny efektu Coriolisa
    Autorzy:
    Sobczak, E.
    Kasprzak, J.
    Ringel, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073244.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    Coriolis acceleration
    Coriolis force
    Coriolis effect
    przyspieszenie Coriolisa
    siła Coriolisa
    efekt Coriolisa
    Opis:
    Mathematical model describing acceleration and the Coriolis force for an object moving along a longitude with a velocity v > 0 (northwards) or v < 0 (southwards) and at same time along a latitude with a velocity vs > 0 (eastwards) or vs < 0 (westwards) has been elaborated: ac = - ( ω + vs /r ) v sinϕ = - ωv sinϕ (1 + s/cosϕ). At a positive velocity along a latitude (vs > 0) an increase in the angular velocity of the Earth globe “cycle” (Δω = vs/r; r = R cosϕ and an increase in the absolute value of the acceleration lacl and the Coriolis force at a given object velocity along a longitude (v > 0 or v < 0) occur, while for a negative value of this velocity (vs < 0) a decrease by the similar value lacl appears. The acceleration and the Coriolis force are not observed when vs= - R ωcosϕ or ϕ= 0.
    Opracowano matematyczny model opisujący przyśpieszenie Coriolisa dla obiektu poruszającego się jednocześnie wzdłuż południka z prędkością v > 0 (na północ) lub v < 0 (na południe) oraz wzdłuż równoleżnika z prędkością vs > 0 (na wschód) lub vs < 0 (na zachód): ac = - ( ω + vs /r ) v sinϕ = - ωv sinϕ (1 + s/cosϕ). Dla dodatniej prędkości wzdłuż równoleżnika (vs > 0) następuje wzrost prędkości kątowej obiegu obiektu wokół osi kuli ziemskiej (Δω = vs/r; r = R cosϕ oraz wzrost bezwzględnej wartości przyśpieszenia Coriolisa lacl przy danej prędkości obiektu wzdłuż południka (v > 0 lub v < 0), natomiast dla (vs < 0) następuje zmniejszenie lacl. Przyśpieszenie Coriolisa zanika dla vs= - R ωcosϕ lub ϕ= 0.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2017, 1; 23--25
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The assessment of the impact of a training process on the habituation of the vestibular-vegetative system, using a special rotational test as a condition of maintaining flight safety
    Autorzy:
    Wochyński, Zbigniew
    Krawczyk, Piotr
    Cur, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/2116592.pdf
    Data publikacji:
    2020-06-16
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    space motion sickness
    special aviation gymnastic instruments
    test on the unlocked looping
    vestibular-vegetative system
    training process
    Coriolis effect
    Opis:
    ObjectivesThe authors formulated a hypothesis that, on completion of the training program by cadets, their vestibular habituation would increase, measured by the time of the duration of the test on the unlocked looping, in contrast to the initial values and the control group.Material and MethodsThe research involved 35 male cadets, first-year students of the Polish Air Force Academy in Dęblin. The examined persons were on average 20 years of age. They were divided into 2 groups. Group A (N = 25, tested) continued training on Special Aviation Gymnastic Instruments (SAGI). The cadets were a homogeneous group of participants in the jet pilot course, selected by the Military Aeromedical Board. Group B (N = 10, control) conducted the standard physical military education program. Groups A and B were tested on the unlocked looping before and after the training process. In the training process, the groups had heart rate (HR) monitored.ResultsThe cadets in group A on the test in the unlocked looping, at the beginning of the training period, had an average score of 468.5±96.6 s, and on completion of the training period 575.6±47.9 s, which is a statistically significant difference at p < 0.000001. Similarly, the examined individuals in group B received an average score of 396.2±31.8 s, and at the end of the training period 473.4±72.0 s, which is a statistically significant difference at p < 0.01. In group A, a statistically significant decrease in the average HR value was observed. In group B, there was a statistically significant increase in the average HR value.ConclusionsThe exercises on SAGI have a beneficial impact on improving the habituation of the vestibular organ in training cadets in examination II, as opposed to examination I and the control group.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2020, 33, 4; 497-506
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on modeling and production inaccuracies for artillery firing
    Autorzy:
    Khalil, Mostafa
    Powiązania:
    https://bibliotekanauki.pl/articles/2065762.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    artillery firing table
    modified point mass
    meteorological message
    Coriolis effect
    genetic algorithm GA
    masa punktowa zmodyfikowana
    wiadomość meteorologiczna
    efekt Coriolisa
    algorytm genetyczny
    Opis:
    Production and assessment of artillery firing tables (FT) are the key tasks in solving ballistic problems through both standard and non-standard firing conditions. According to the literature, two different standard firing table formats were developed by the former-Soviet and the United States armies. This study proposes the main difference between these FT formats, as the standard meteorological conditions. An accuracy assessment has been proposed to justify different sources of errors through modeling and production of such tables, including applied meteorological message, aiming angles round-off, linear superposition principle, and Earth approximation. A~case study has been proposed for the 155M107 projectile to demonstrate the impact of the Coriolis effect as well as other ballistic and atmospheric non-standard conditions. As a part of the construction of artillery FT, a fitting process has to be made between available firing data and simulations. Therefore, a parametric study is implemented to study the number of test elevations per charge needed through the fitting process and its corresponding production error. Hence, based on the number of test elevations available, the genetic algorithm (GA) has been utilized to obtain the test elevations order needed with minimum FT production error. The results show a good agreement with the data stated in the literature.
    Źródło:
    Archive of Mechanical Engineering; 2022, LXIX, 1; 165--183
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Linear stability effect of densely distributed porous medium and Coriolis force on Soret driven ferrothermohaline convection
    Autorzy:
    Sekar, R.
    Murugan, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/264456.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    siła Coriolisa
    model Darcy'ego
    efekt Soreta
    ferrofluid
    Coriolis force
    Darcy model
    Soret effect
    thermohaline convection
    Opis:
    The effect of Coriolis force on the Soret driven ferrothermohaline convection in a densely packed porous medium has been studied. A linear stability analysis is carried out using normal mode technique. It is found that stationary convection is favorable for the Darcy model, therefore oscillatory instability is studied. A small thermal perturbation is applied to the basic state and linear stability analysis is used for which the normal mode technique is applied. It is found that the presence of a porous medium favours the onset of convection. The porous medium is assumed to be variable and the effect of the permeable parameter is to destabilize the system. The present work has been carried out both for oscillatory as well as stationary instabilities. The results are depicted graphically.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 911-928
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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