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Wyszukujesz frazę "shock sensitivity" wg kryterium: Temat


Wyświetlanie 1-4 z 4
Tytuł:
Research on the Critical Sizes for Detonation of Cube-shaped Transfer Charges
Autorzy:
Zhao, Xiang-run
Jin, Shi-xin
Huang, Jin-hong
Li, Chao-zhen
Yan, Li-wei
Powiązania:
https://bibliotekanauki.pl/articles/358353.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
explosive train
transfer charge
shock wave sensitivity
minimum safe separation distance
Opis:
In order to obtain the minimum size, thickness and safe separation distance, for the cube-shaped transfer charges used in MEMS (micro-electromechanical system) explosive trains, an explosive train using a JO-9C(III) cube-shaped transfer charge was designed for experimental research. Detonation transfer experiments and detonation interruption experiments were conducted in turn. In initial experiments, the electric detonators were all in the armed position, but different thicknesses of the cube-shaped transfer charges were used. In the later experiments, the thickness of the transfer charges were unchanged, but the separation distances were different. The detonation path of the transfer charge under unsafe conditions was analyzed using the shock wave attenuation law. The results showed that the minimum thickness ranged from 0.2 mm to 0.4 mm, the minimum safe separation distance ranged from 0.4 mm to 0.6 mm; and the cube-shaped transfer charge is detonated by a shock wave from a steel gap rather than air clearance when the safe separation distance is less than the minimum threshold. The thickness design value of the cube-shaped transfer charge (JO-9C(III)) should not be less than 0.6 mm, and the safe separation distance design value of the MEMS explosive train should not be less than 1 mm.
Źródło:
Central European Journal of Energetic Materials; 2019, 16, 1; 91-104
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resilience of the Czech Regions to an external economic shock
Autorzy:
Lungová, Miroslava
Powiązania:
https://bibliotekanauki.pl/articles/414579.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Warszawski. Instytut Ameryk i Europy. Centrum Europejskich Studiów Regionalnych i Lokalnych (EUROREG)
Tematy:
resilience
region economic shock
downturn
sensitivity
recession
Czech regions
Opis:
The article explores resilience of the Czech NUTS3-level regions to an external economic shock in the form of the latest global economic crisis of 2008-2009. It begins with a brief introduction of the concept of resilience and of terminological and methodological issues associated with operationalizing it. Next, regional resistance to the external economic shock is assessed using sensitivity indices of relative output and employment contractions. Finally, the nature and severity of the shock as well as regional disparities in recoverability are investigated using employment data.
Źródło:
Studia Regionalne i Lokalne; 2016, 4(66); 30-47
1509-4995
Pojawia się w:
Studia Regionalne i Lokalne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensitivity of ‘Monika’ Cucumis sativus seedlings to low temperature and induction of chilling tolerance
Autorzy:
Górnik, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2199620.pdf
Data publikacji:
2015-06-20
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
chilling sensitivity
cucumber
thermal shock
temperature stress
chilling resistance
Opis:
The aim of the research was to investigate the chilling sensitivity of cucumber seedlings and to alleviate its negative effects by short-term shock temperature applied during seeds imbibition, before radicle protrusion. The chilling sensitivity was investigated depending on initial root length (1, 3, 5 and 7 mm) and duration of chilling exposure (0, 1, 3, 7, 14, 21 days) at 0˘C and was evaluated by measurements of roots and hypocotyls growth, electrolyte leakage and dehydrogenases activity. To assess whether short-term shock temperature applied before radicle protrusion can increase chilling tolerance in cucumber seedlings the seeds were imbibed at 25°C for 16 h, exposed to temperatures of 0; 2,5; 5; 35; 40, 45°C for 0; 0,5; 1; 2; 4 h. The obtained results indicated that cucumber seedlings sensitivity depended on duration of chilling exposure and initial root length during which the seedlings were subjected to these conditions. Chilling sensitivity were manifested by drop in the roots and hypocotyls elongation, reduction in dehydrogenases activity and membrane integrity expressed by electrolyte leakage. Seedlings with 1 mm roots was relatively tolerant to 3 days of chilling at 0°C. Their chilling sensitivity increased as roots elongated. Seedling with 3, 5, 7 mm of roots subjected to chilling suffered a subsequent 71, 75 and 81% of growth inhibition, respectively. The presented results showed that a short-term of low (0; 2,5 or 5°C) or high (35; 40 or 45°C) temperature treatments applied before radicle protrusion i.e. after 16 h of seeds imbibition significantly counteracted the negative effects of chilling on seedlings. The best results expressed by increased length and the number of roots were obtained when imbibed seeds were exposed to 45°C for 2 and 4 h. The increased chilling tolerance of cucumber seedlings induced as early as at the stage of seed imbibition, before radicle protrusion indicates on the possibility of application of this method in practice. The positive response of such treatment on cucumber chilling tolerance are discussed.
Źródło:
Plant Breeding and Seed Science; 2015, 71; 3-11
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on FOX-7 Based Melt Cast High Explosive Formulations
Autorzy:
Mishra, V. S.
Vadali, S. R.
Garg, R. K.
Joshi, V. S.
Wasnik, R. D.
Asthana, S.
Powiązania:
https://bibliotekanauki.pl/articles/358915.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
melt cast
FOX-7
LOVEX
shock sensitivity
VOD
impulse
IMs
Opis:
The key driving force in modern explosive research is the development of low vulnerable high explosive (LOVEX) compositions for future applications in insensitive munitions (IMs). The increasing demand for LOVEX has led to exhaustive studies on low vulnerable explosives as a replacement for conventional cyclo-1,3,5-trimethylene-2,4,6-trinitramine (RDX) in 2,4,6-trinitrotoluene (TNT) melt cast high explosive formulations. In the present study, 1,1-diamino-2,2dinitroethene (FOX-7) has been evaluated as a possible RDX replacement in TNT based, non-aluminized as well as aluminized, melt cast formulation. FOX-7 based melt cast formulations were characterized for their sensitivity to mechanical/shock stimuli, velocity of detonation (VOD), blast parameters and thermal decomposition behavior. These characteristics are compared with the corresponding RDX based compositions as reference standard. The studies show that with little sacrifice on performance parameters, FOX-7 based, non-aluminized and aluminized, melt cast formulations are found to be less vulnerable, compared with the corresponding RDX based formulations.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 4; 569-580
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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