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Wyświetlanie 1-7 z 7
Tytuł:
Instytut Techniki Budowlanej w Europie i świecie
The Building Research Institute (ITB) in Europe and all over the world
Autorzy:
Fangrat, J.
Pachman, A.
Powiązania:
https://bibliotekanauki.pl/articles/182811.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniki Budowlanej
Tematy:
Instytut Techniki Budowlanej
działalność
współpraca międzynarodowa
organizacja międzynarodowa
Building Research Institute
activity
international cooperation
international organization
Opis:
Publikacja poświęcona jest współpracy podejmowanej przez Instytut Techniki Budowlanej z pokrewnymi instytucjami w skali europejskiej i światowej. Charakteryzuje ponadto wybrane partnerskie organizacje międzynarodowe budownictwa. Opis działań Instytutu na forum międzynarodowym uwzględnia udział specjalistów ITB w konferencjach i spotkaniach międzynarodowych, udział ITB w projektach finansowanych ze środków Unii Europejskiej, wizyty gości zagranicznych w ITB oraz publikacje zagraniczne pracowników Instytutu. Ponadto w publikacji przedstawiono działalność normalizacyjną w CEN i ISO.
The article describes the ITB international cooperation. It characterizes couple of international organizations with whom the Institute cooperates as well as the ITB standardization activity in CEN and ISO. This article provides information concerning the participation of ITB experts in international conferences and meetings, the ITB involvement in EU projects, number of international delegates in the Institute and foreign publications of ITB experts.
Źródło:
Prace Instytutu Techniki Budowlanej; 2011, R. 40, nr 3, 3; 57-73
0138-0796
Pojawia się w:
Prace Instytutu Techniki Budowlanej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of polar plasticizers on the characteristics of selected cyclic nitramines
Autorzy:
Elbeih, A.
Zeman, S.
Pachman, J.
Powiązania:
https://bibliotekanauki.pl/articles/358627.pdf
Data publikacji:
2013
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
energetic materials
polymers
sensitivity
combustion
thermal stability
Opis:
Dioctyl sebacate (DOS) is a plasticizer used with oily material for the softening of polyisobutylene binder (PIB) to form a polymeric matrix. This matrix was used for the preparation of various plastic explosives. The following energetic cyclic nitramines were used as explosive fillers: BCHMX (cis-1,3,4,6- tetranitrooctahydroimidazo [4,5 d]imidazole), ε-HNIW (ε-2,4,6,8,10,12- hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane), RDX (1,3,5-trinitro-1,3,5- triazacyclohexane), and HMX (1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane). For comparison, Fluorel binder was used for the preparation of several plastic bonded explosives (PBXs) based on the same selected explosives. Impact and friction sensitivities of the prepared samples and the pure explosive fillers were measured. The thermal stability was studied using differential thermal analysis (DTA). High performance liquid chromatography (HPLC) was used to detect the presence of BCHMX dissolved in dioctyl sebacate (DOS). The heat of combustion of the prepared samples and of the pure explosive fillers was measured using a bomb calorimetry. The results show that PIB softened by plasticizer (DOS) has a greater positive effect on decreasing the impact sensitivity of the studied pure explosives than Fluorel binder. On the other hand, the plasticizer acts as a solvent for the energetic materials and decreases the decomposition temperature of these plastic explosives.
Źródło:
Central European Journal of Energetic Materials; 2013, 10, 3; 339-349
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Replacement of PETN by Bicyclo-HMX in Semtex 10
Autorzy:
Elbeih, A.
Pachman, J.
Zeman, S.
Akstein, Z.
Powiązania:
https://bibliotekanauki.pl/articles/403386.pdf
Data publikacji:
2010
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
chemical engineering
plastic explosive
detonation characteristics
Opis:
Bicyclo-HMX (BCHMX) was studied in the form of a plastic explosive bonded by the plastic matrix of the explosive Semtex 10 and the results were compared with the original Semtex 10 which contains PETN as an explosive filler. The tests included measurements in the sensitivity to impact and friction. The thermal stability was studied using differential thermal analysis (DTA) with the evaluation of the outputs using the Kissinger method. The detonation velocity was measured experimentally and the detonation characteristics were calculated by means of EXPLO 5 code and the Kamlet & Jacobs method. On the basis of mutual comparison of all the obtained results, it was concluded that replacement of PETN by Bicyclo-HMX enhances the friction sensitivity, thermal stability and the detonation parameters of the explosive Semtex 10, while the impact sensitivity is approximately the same. Calculated results of EXPLO 5 code showed good agreement with the experimental detonation velocities.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2010, 1, 2 (2); 7-16
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Stability and Detonation Characteristics of Pressed and Elastic Explosives on the Basis of Selected Cyclic Nitramines
Autorzy:
Elbeih, A.
Pachmáň, J.
Zeman, S.
Trzciński, W. A.
Akstein, Z.
Sućeska, M.
Powiązania:
https://bibliotekanauki.pl/articles/358014.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
detonation
C4 matrix
BCHMX
HMX
HNIW
RDX
stability
Viton
Opis:
Bicyclo-HM X (cis-1,3,4,6-tetranitro-octahydroimidazo-[4,5-d] imidazole or BCHM X) was studied as a plastic explosive bonded with the C4 matrix and with Viton A. Also a series of nitramines namely RDX (1,3,5-trinitro-1,3,5=triazinane), HM X (1,3,5,7-tetranitro-1,3,5,7-tetrazocane) and HNIW (ĺ-2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane, ĺ-CL-20) were studied for comparison with the same types of binders. The detonation velocity, D, of all prepared mixtures was measured. Their thermal stability was determined using non-isothermal differential thermal analysis (DTA). While the C4 matrix lowers the thermal stability of the resulting explosives, Viton A enhances this stability. Approximate relationships between the peaks of exothermic decomposition and the D values were found. The detonation parameters were also calculated by means of Kamlet & Jacobs method, CHEETAH and improved EXPLO5 code for all the mixtures. From the measured D values and the calculated detonation parameters, it is obvious that the detonation parameters of BCHM X-mixtures are very close to HM X-explosives and better than those of RDX-mixtures. It was found that the C4 matrix reduces the difference between the values of energy of detonation in the studied C4 mixtures. As expected, the pressed HNIW-Viton A mixture has the highest detonation parameters of all of the prepared mixtures.
Źródło:
Central European Journal of Energetic Materials; 2010, 7, 3; 217-232
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blast Wave Parameters of Liquid Esters of Nitric Acid: Propane-1,2,3-triyl Trinitrate, Propane-1,2-diyl Dinitrate, Ethane-1,2-diyl Dinitrate and Methyl Nitrate
Autorzy:
Pachman, J.
Selesovsky, J.
Künzel, M.
Matyas, R.
Kubat, K.
Anastacio, A. C.
Kučera, J.
Powiązania:
https://bibliotekanauki.pl/articles/358057.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nitric ester
blast wave
TNT equivalent
liquid explosive
shock wave in air
Opis:
A knowledge of blast wave parameters generated by detonating explosives is important for the evaluation of protective measures, modelling validation and post blast analysis. The relevant data are available for solid military explosives, but not for liquid or homemade explosives. In this contribution we present comparison of experimental incident blast wave parameters for bare charges, weighing from 100 g to 1 kg, of liquid esters of nitric acid, including propane-1,2,3-triyl trinitrate (NG), propane-1,2-diyl dinitrate (PGDN), ethane-1,2-diyl dinitrate (EGDN) and methyl nitrate (MeN), amongst themselves and with TNT charges of approximately the same size. The TNT equivalents, determined from both the incident overpressures and the impulse of the positive phase of the blast wave, were above 100% and showed relatively high scatter. The strongest blast wave parameters under otherwise identical conditions were observed for charges of methyl nitrate.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 2; 375-390
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
OPTIMEX: Measurement of Detonation Front Curvature with a Passive Fiber Optical System
Autorzy:
Pachman, J.
Künzel, M.
Kubát, K.
Selesovsky, J.
Maršálek, R.
Pospíšil, M.
Kubíček, M.
Prokeš, A.
Powiązania:
https://bibliotekanauki.pl/articles/358142.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
detonation front curvature
detonation shock curvature
A-IX-1
RDX
OPTIMEX
Opis:
The ability of a newly developed independent passive optical system OPTIMEX to measure the detonation front curvature is demonstrated on charges of pressed explosive A-IX-1 (RDX/ceresin-stearin mixture with 95/5 wt.%). The charges, with length to diameter ratios of from one to four, were prepared from cylinders with diameters of 21 mm, 30 mm, 40 mm and 50 mm pressed to a density of 1.66 g/cm3. Such charges detonate with a velocity of 8220 m/s. The detonation curvature was obtained using 8 optical fibers and the results were compared with photographs acquired by an ultra-high speed framing camera UHSi 12/24.
Źródło:
Central European Journal of Energetic Materials; 2016, 13, 4; 807-820
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
OPTIMEX: Measurement of Detonation Velocity with a Passive Optical Fibre System
Autorzy:
Pachmáň, J.
Künzel, M.
Kubát, K.
Šelešovský, J.
Maršálek, R.
Pospíšil, M.
Kubíček, M.
Prokeš, A.
Powiązania:
https://bibliotekanauki.pl/articles/358710.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
velocity of detonation
VOD
optical fibre
passive VOD measurement
OPTIMEX
Opis:
Detonation velocity (VOD) is one of the most important parameters describing the detonation process of a particular explosive. This article summarizes some peculiarities that we have come across when building and testing our new passive optical VOD meter – OPTIMEX. The advantages of using multiple probes with independent signal recording is discussed. The practical issues related to an explosive’s translucency are solved. Finally, a new method for detonation velocity data evaluation is proposed and demonstrated.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 1; 233-250
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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