Military Research Institute

Brno, Czech Republic

Military Research Institute

Brno, Czech Republic

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Racek F.,University of Defence at Brno | Jobanek A.,Military Research Institute | Balaz T.,University of Defence at Brno | Krejci J.,University of Defence at Brno
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

Pixelated camouflage patterns fulfill the role of both principles the matching and the disrupting that are exploited for blending the target into the background. It means that pixelated pattern should respect natural background in spectral and spatial characteristics embodied in micro and macro patterns. The HS imaging plays the similar, however the reverse role in the field of reconnaissance systems. The HS camera fundamentally records and extracts both the spectral and spatial information belonging to the recorded scenery. Therefore, the article deals with problems of hyperspectral (HS) imaging and subsequent processing of HS images of pixelated camouflage patterns which are among others characterized by their specific spatial frequency heterogeneity. © 2016 SPIE.


Bodnarova L.,Brno University of Technology | Machanova P.,Brno University of Technology | Kopkane D.,Military Research Institute | Herka P.,R.Ø.S.A. | Stahel P.,Masaryk University
Advanced Materials Research | Year: 2014

The paper presents results of experimental works focused on property verification of concretes with an admixture of polypropylene fibres with various surface treatments. Common production polypropylene fibres with surface lubrication, polypropylene fibres without surface treatment and low temperature plasma treated polypropylene fibres were used for the testing. © (2014) Trans Tech Publications, Switzerland.


PubMed | Military Research Institute, University of Regensburg and Masaryk University
Type: Journal Article | Journal: Analytical chemistry | Year: 2016

Sulfur mustard is a chemical agent of high military and terroristic significance. No effective antidote exists, and sulfur mustard can be fairly easily produced in large quantity. Rapid field testing of sulfur mustard is highly desirable. Existing analytical devices for its detection are available but can suffer from low selectivity, laborious sample preparation, and/or the need for complex instrumentation. We describe a new kind of test strip for rapid detection of gaseous sulfur mustard that is based on its degradation by the enzyme haloalkane dehalogenase that is accompanied by a change of local pH. This change can be detected using pH indicators contained in the strips whose color changes from blue-green to yellow within 10 min. In addition to visual read-out, we also demonstrate quantitative reflectometric readout by using a conventional digital camera based on red-green-blue data acquisition. Organic haloalkanes, such as 1,2-dichloroethane, have a negligible interfering effect. The visual limit of detection is 20 g/L, and the one for red-green-blue read-out is as low as 3 g/L. The assays have good reproducibility 6% and 2% for interday assays and intraday assays, respectively. The strips can be stored for at least 6 months without loss of function. They are disposable and can be produced fairly rapidly and at low costs. Hence, they represent a promising tool for in-field detection of sulfur mustard.


Binar T.,University of Defence at Brno | Sukac J.,University of Defence at Brno | Vondrak J.,Brno University of Technology | Silinger K.,University of Defence at Brno | Krestan J.,Military Research Institute
ECS Transactions | Year: 2015

The paper is concerned with basic mechanical properties directly affecting ballistic resistance in relation to the ambient temperature changes. Possible decrease in the material ballistic resistance may eventually lead to the increase in logistic processes-related expenditures, e.g. when acquiring property and services upon combat damage to the military vehicle material. In the experiment, a critical ambient temperature was determined, at which degradation processes, considerably decreasing the ballistic resistance of the material tested, are highly probable to occur. The experiment was supplemented with a chemical analysis using EDS and transmission electron microscopy of selected specimens, where modifications in measured material characteristics were detected, which are influencing the live cycle of the material. © The Electrochemical Society.


Binar T.,University of Defence at Brno | Sukac J.,University of Defence at Brno | Silinger K.,University of Defence at Brno | Zatloukal M.,Brno University of Technology | Rolc S.,Military Research Institute
ECS Transactions | Year: 2015

As far as the projectile/armour interaction is concerned, it can be generally stated that the interaction triggers degradation processes, and subsequently leads to a limit state in the material. The nature of the armour plate damage is directly related to the type of ammunition used and indirectly to the operating conditions (the shooter's capability, the technical condition of the weapon, etc.). The paper examines limit conditions (critical temperature), under which ballistic resistance, which is measured based on determined mean velocity V50, decreases. Military vehicles deployed in peace missions abroad operate under various climatic conditions characterised by significant temperature variations in the course of day. When superposing the ambient temperature influence and the ammunition effect, the projectile penetration through the material and unexpected expenditures relating to the restoration of the damaged material original properties can be assumed. In addition to the efficient use of public financial means, foreign operation logistic support planning must take possible damage to the military vehicles, resulting from enemy's combat activities, into consideration. On the basis of the determined mean velocity within the temperature range-80 °C to 100 °C, the correlation of selected material characteristics was studied. In order to determine the share of the test temperature in the material degradation states, the experiment was supplemented with a fractographic analysis and transmission electron microscopy. © The Electrochemical Society.


Janos P.,University of Jan Evangelista Purkyne | Henych J.,University of Jan Evangelista Purkyne | Henych J.,Academy of Sciences of the Czech Republic | Pelant O.,University of Jan Evangelista Purkyne | And 5 more authors.
Journal of Hazardous Materials | Year: 2016

Four different synthetic routes were used to prepare active forms of cerium oxide that are capable of destroying toxic organophosphates: a sol-gel process (via a citrate precursor), homogeneous hydrolysis and a precipitation/calcination procedure (via carbonate and oxalate precursors). The samples prepared via homogeneous hydrolysis with urea and the samples prepared via precipitation with ammonium bicarbonate (with subsequent calcination at 500. °C in both cases) exhibited the highest degradation efficiencies towards the extremely dangerous nerve agents soman (O-pinacolyl methylphosphonofluoridate) and VX (O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothioate) and the organophosphate pesticide parathion methyl. These samples were able to destroy more than 90% of the toxic compounds in less than 10. min. The high degradation efficiency of cerium oxide is related to its complex surface chemistry (presence of surface OH groups and surface non-stoichiometry) and to its nanocrystalline nature, which promotes the formation of crystal defects on which the decomposition of organophosphates proceeds through a nucleophilic substitution mechanism that is not dissimilar to the mechanism of enzymatic hydrolysis of organic phosphates by phosphotriesterase. © 2015 Elsevier B.V.


PubMed | University of Jan Evangelista Purkyne, Military Research Institute and Academy of Sciences of the Czech Republic
Type: | Journal: Journal of hazardous materials | Year: 2015

Four different synthetic routes were used to prepare active forms of cerium oxide that are capable of destroying toxic organophosphates: a sol-gel process (via a citrate precursor), homogeneous hydrolysis and a precipitation/calcination procedure (via carbonate and oxalate precursors). The samples prepared via homogeneous hydrolysis with urea and the samples prepared via precipitation with ammonium bicarbonate (with subsequent calcination at 500C in both cases) exhibited the highest degradation efficiencies towards the extremely dangerous nerve agents soman (O-pinacolyl methylphosphonofluoridate) and VX (O-ethyl S-[2-(diisopropylamino)ethyl] methylphosphonothioate) and the organophosphate pesticide parathion methyl. These samples were able to destroy more than 90% of the toxic compounds in less than 10 min. The high degradation efficiency of cerium oxide is related to its complex surface chemistry (presence of surface OH groups and surface non-stoichiometry) and to its nanocrystalline nature, which promotes the formation of crystal defects on which the decomposition of organophosphates proceeds through a nucleophilic substitution mechanism that is not dissimilar to the mechanism of enzymatic hydrolysis of organic phosphates by phosphotriesterase.


Racek F.,University of Defence at Brno | Jobanek A.,Military Research Institute | Balaz T.,University of Defence at Brno
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The paper deals with description of newly developing method of Hyperspectral camera utilization for determination of camouflage surfaces spectral characteristics homogeneity. The color patterns of camouflage surfaces are usually checked pointwise. It is assumed subsequently that the spectral characteristics of the pattern are the same for whole area of camouflage surface. The essential properties of hyperspectral camera allow to determine the level of spectral qualities homogeneity of the surface. Although the respective snapping of hyperspectral image is fairly easy, the evaluation of HS datacube features specific problems connected with homogeneity of illuminance, optical system aberrations, transformation to reflectance and spectral unmixing. All the measurement aspects have to be taken into account to correctly determine the homogeneity of camouflage surfaces spectral characteristics. © 2015 SPIE.


Binar T.,University of Defence at Brno | Dvorak I.,University of Defence at Brno | Kadlec J.,University of Defence at Brno | SukaC J.,University of Defence at Brno | And 2 more authors.
Advances in Military Technology | Year: 2014

The paper is concerned with material characteristics of plastic deformation, relating to the occurrence and development of plastic deformation, proof stress and strain hardening exponent with changing testing temperature, in high-strength low-alloy steels. The material characteristics of plastic deformation were measured experimentally by means of a tensile test in the temperature range from -80 °C to +100 °C; subsequently, a fractographic analysis of fracture surfaces was carried out in order to evaluate failure mechanisms of the steels studied. © 2014, University of Defence.


Drdlova M.,Research Institute for Building Materials | Holesinsky R.,Research Institute for Building Materials | Ridky R.,SVS FEM Ltd | Krestan J.,Military research institute
Advanced Materials Research | Year: 2014

The paper summarizes the up to now results of the development of special concrete intended for the explosion resistance applications, the emphasis is put also on minimal secondary fragments formation at the explosion. The fine-grained concrete matrix has been reinforced by various types of dispersed fibers (metallic, mineral and polymer) of different sizes and by their combination, while the same volume content of fibres has been kept. The concrete prism samples have been subjected to the determination of mechanical parameters (compressive and flexural strength, modulus of elasticity). The concrete test elements of the same sizes as commercial products have been made and their explosion resistance was tested. The material characteristics and explosion test data have been used for modeling the adequate wall thickness of the concrete element which should resist the explosion defined by type, size, weight and placement of the blast. In the next step the test elements has been reinforced by additional outer layer of non-metallic tissue and subjected to explosion tests. © (2014) Trans Tech Publications, Switzerland.

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