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    Wyświetlanie 1-3 z 3
    Tytuł:
    Evaluation of water impact for symmetric wedge by experimental and numerical methods
    Autorzy:
    Nikfarjam, M.
    Koto, J.
    Yaakob, O. B.
    Seif, M. S.
    Aref, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/266182.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    hydrodynamika
    ciśnienie uderzenia
    statek
    symmetric wedge
    hydrodynamic impact
    impact pressure
    Opis:
    Evaluation of impact loads when a ship hull contacts the wave surface is one of the main issues for researchers who are going to design the structure of marine vehicles. In this paper, the results of experimental tests and numerical modeling of the distribution of pressure on different wedge-shaped models are reported and the effect of related parameters such as the deadrise angles, the weight and drop heights, is assessed. The output of analyses and the results can give appropriate approximations of the maximum impact pressures for the geometries that are similar to marine vehicle’s hull sections to estimate the hydrodynamic impact loads in different sea-states. In addition, other effective parameters such as the impact speed, acceleration and water entry process can be used for evaluating the performance of such crafts.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 221-230
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of regular physical activity on non-lipid (novel) cardiovascular risk factors
    Autorzy:
    Naghii, Mohammad R.
    Aref, Mraryam A.
    Almadadi, Mehdi
    Hedayati, Mehdi
    Powiązania:
    https://bibliotekanauki.pl/articles/2185376.pdf
    Data publikacji:
    2011-12-01
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    physical activity
    non-lipid cardiovascular risk factors
    cytokines
    military personnel
    Opis:
    Objectives: Cardiovascular — coronary heart disease, causing heart attack and heart failure is a leading cause of disability and death worldwide. The most important risk factors for CVD are well-established and physical activity has long been considered the cornerstone of interventions and has shown extremely important in reducing the burden of this disease. The aim of this study was to examine the association between activity and inactivity and non-lipid CVD risk factors in healthy military recruits. Materials and Methods: Selected hormones and variables such as testosterone, free testosterone, Vitamin D, homocysteine, folic acid, with the inflammatory cytokines such as hsCRP, TNF-α and IL-6 were assessed in two groups (active = 50, inactive = 50), randomly matched by a questionnaire. Relationships between some measured variables and CVD risk factors were determined using simple correlation procedures. Results: Physically active subjects had signifi cantly lower results of homocysteine (14.3±1.9 vs. 16.5±3.7, p < 0.000) and interleukin-6 (2.9.±5.3 vs. 6±8.2, p < 0.025) and tended to have a nearly signifi cantly higher free testosterone level (13.1±7.1 vs. 11±5.3, p = 0.08). Signifi cant correlations were found between BMI, WC, tHcy, and the corresponding risk factors; and also between hsCRP and IL-6, as well as TT and FT. Conclusions: Reducing the risk factors of developing CVD events such as homocysteine and interleukin-6, together with increasing free testosterone and signifi cantly preventing its progression, clearly serve to underscore the benefi cial properties of physical activity and to promote its effectiveness as a support means for healthier lifestyles in the community and, particularly, among military personnel.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2011, 24, 4; 380-390
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The cotton mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) as a new menace to cotton in Egypt and its chemical control
    Autorzy:
    El-Zahi, E.-Z.S.
    Aref, S.A.E.-S.
    Korish, S.K.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/65005.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    insect
    cotton mealybug
    mealybug
    Phenacoccus solenopsis
    Hemiptera
    Pseudococcidae
    new menace
    cotton
    Egypt
    chemical control
    Opis:
    The cotton mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) is a polyphagous sap sucking insect with a wide geographical and host range causing severe losses in economically important crops. This study represents the first record of P. solenopsis as a new insect attacking cotton plants (Gossypium barbadense var. Giza 86) in Kafr El-Sheikh governorate, Egypt. The insect was noticed on cotton plants for the first time during its growing season of 2014. The mealybug specimens were collected from infested cotton plants and identified as P. solenopsis. In an attempt to control this pest, eight toxic materials viz., imidacloprid, thiamethoxam, flonicamid, emamectin-benzoate, chlorpyrifos, methomyl, deltamethrin and mineral oil (KZ-oil), belonging to different chemical groups, were tested for their influence against P. solenopsis on cotton under field conditions. Methomyl, imidacloprid, thiamethoxam and chlorpyrifos showed the highest efficacy against P. solenopsis recording 92.3 to 80.4% reduction of the insect population. Flonicamid, emamectin-benzoate and KZ-oil failed to exhibit sufficient P. solenopsis control.
    Źródło:
    Journal of Plant Protection Research; 2016, 56, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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