Wyniki wyszukiwania - BazTech

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4,6-Diazido-N-(2,4,6-trinitrophenyl)-1,3,5-triazin-2-amine (TNADAzT) and Its Silver Salt − Synthesis and Characterization

Musil T., Matyáš R., Zeman S., Růžička A., Lyčka A., Majzlík J., Vala R., Knotek P.

Central European Journal of Energetic Materials

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2017

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Vol. 14, no. 2

304--320

EN

4,6-Diazido-N-(2,4,6-trinitrophenyl)-1,3,5-triazin-2-amine (TNADAzT) and its silver salt (AgTNADAzT) were prepared and characterized. Elemental analysis, FTIR, NMR, DSC, AAS and X-ray diffraction were used for analytical characterization. The sensitivities of TNADAzT and AgTNADAzT were determined and compared with common explosives and MTX-1. The crystal density of TNADAzT is 1.794 g·cm−3 and its heat of formation 899 kJ·mol−1. The sensitivity of TNADAzT to impact and friction slightly exceeds PETN; the sensitivity to electrostatic discharge is lower than RDX. The sensitivity of AgTNADAzT is on the level of a primary explosives (between mercury fulminate and PETN). The initiation efficiency of AgTNADAzT is higher than 200 mg (acceptor PETN compressed by 64-70 MPa) and therefore excludes it from practical use as a primary explosive in detonators.

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Decreasing the Friction Sensitivity of TATP, DADP and HMTD

Matyáš R., Šelešovský J., Musil T.

Central European Journal of Energetic Materials

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2013

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Vol. 10, no. 2

263--275

EN

The infuence of water and WD-40 oil content on the sensitivity to friction of three primary explosives, triacetone triperoxide (TATP), diacetone diperoxide (DADP) and hexamethylene triperoxide diamine (HMTD), has been investigated. All of these explosives belong to a group of improvised explosives. The possibility of desensitization of these explosives by the addition of other substances was studied. Sensitivity curves were obtained for the solid organic peroxides with various liquid contents. The sensitivity decreases signifcantly with only a small quantity of liquid − up to about 20% of the liquid. Further increase in the liquid content has a negligible further impact on the sensitivity to friction. Water and WD-40 oil were compared as desensitizating agents.

3

Study of TATP: Mass Loss and Friction Sensitivity During Ageing

Matyáš R., Šelešovský J., Musil T.

Central European Journal of Energetic Materials

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2012

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Vol. 9, nr 3

251-260

EN

Triacetone triperoxide (3,3,6,6,9,9-hexamethyl-1,2,4,5,7,8-hexoxonane; TATP) is one of the most frequently used improvised explosives, often misused worldwide. In our previous studies, we had observed that the kind of acid used to catalyse its formation has a significant influence on TATP's properties. TATP was prepared using five different acids that are often used in improvised conditions. All of the samples were subjected to natural ageing in both open and closed vials at laboratory temperature. During ageing, TATP sublimes and decomposes. The changes in crystal size and shape after ageing were documented by optical microscopy. The mass loss was monitored about every third day during ageing. Samples prepared using sulphuric and perchloric acids lose weight more quickly than the others due to chemical decomposition. The friction sensitivity was determined for all samples before and after ageing. Neither the type of acid used nor the influence of closing the vials had any significant influence on the friction sensitivity after ageing. The friction sensitivity of all tested samples of TATP was about the same ? between that of lead azide and that of mercury fulminate.

4

Calculation of the equilibrium position of the rotor supported by journal bearings using parallel message passing algorithm

Musil T.

Modelling and Optimization of Physical Systems

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2007

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z. 6

123--126

EN

A calculation of the equilibrium position belongs to basic analyses made on computational model of the rotor. If the rotor is supported by journal bearings they are usually incorporated into the model by means of nonlinear force couplings. This leads to the set of nonlinear algebraic equations whose solution can be time consuming. The contribution presents parallel approach based on message passing technique.

CS

Výpočet rovnovážné polohy je základní analýzou, která je prováděna na výpočtovém modelu rotoru. Pokud je rotor uložen v hydrodynamických ložiskách, jsou většinou uvážena pomocí nelineárních silových vazeb. Výsledkem je soustava nelineárních algebraických rovnic, jejichž řešení může být časově náročné. Příspěvek ukazuje paralelní přístup založený na technice zasílání zpráv.

5

Numerical evaluation of amplitude-frequency characteristic of linear rotor system using distributed computation

Musil T.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2006

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z. 31

107-110

EN

Using distributed computation is numerically assembled amplitude-frequency characteristic of the linear rotor system. Evaluation is performed on a parallel computer with distributed memory and with eight processors.