Technical Military Academy

Bucharest, Romania

Technical Military Academy

Bucharest, Romania
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Lazau C.,Romanian National Institute for Research and Development in Electrochemistry and Condensed Matter | Iordache T.-V.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Florea A.-M.,Romanian National Institute for Research and Development in Chemistry and Petrochemistry | Florea A.-M.,Polytechnic University of Bucharest | And 5 more authors.
Applied Surface Science | Year: 2016

In this study, TiO2 films were successfully grown in-situ onto a FTO substrate by a hydrothermal method, using TiCl4 as Ti precursor, and further on functionalized with a 2,4,6-trinitrotoluene-molecularly imprinted polymer (TNT-MIP) film as a preliminary step in developing a trinitrotoluene (TNT) reusable sensor to overcome the international security issues. For investigating the TiO2 film thickness, crystalline structure and morphology, the films were autoclaved at 200 °C at different times. The X-ray diffraction showed that TiO2 films possessed a rutile structure, with no cracks visible by atomic force microscopy (AFM), and the films morphology observed by scanning electron microscopy (SEM) was highly dependent upon the hydrothermal treatment time. Yet, the TiO2 films with a more porous surface were more suitable for TNT-MIP film deposit. Rheology of precursor polymer film solutions, based on poly (acrylonitrile-co-acrylic acid), poly (acrylonitrile-co-methacrylic acid) or poly (acrylonitrile- co-itaconic acid), and the structure and adherence of TNT-MIP films were investigated in order to establish the correct recipe of the MIP. The removal yield of TNT from the imprinted films, the thickness, the porosity and the compatibility with the inorganic TiO2 film were adequate for the poly (acrylonitrile-co-acrylic acid) system with an acrylonitrile: acrylic acid practical ratio of 86.1:13.9 (wt./wt.). Farmore, AFM morphology corroborated with SEM results highlighted the effect of TNT imprinting in the copolymer matrix as the surface of the imprinted layer was quite different from that of the non-imprinted layer. © 2016 Elsevier B.V.


Creosteanu A.,ON Semiconductor | Gavrila G.,Technical Military Academy
Proceedings of the International Semiconductor Conference, CAS | Year: 2013

An electronic system is compatible with its electromagnetic environment if it satisfies the following two criteria: it does not emit (unintentional) electromagnetic energy above a certain minimum level, and it is not susceptible to malfunction if unintentional electromagnetic energy below a certain level is incident on it. This paper presents a study on the effect that electromagnetic interferences have on a high precision temperature sensor. An experimental setup was created to generate the radiated emissions, and results were analyzed using DSP processing. The perturbation signal obtained was applied on the temperature sensor supply voltage and results were analyzed. © 2013 IEEE.


Radoi A.,Polytechnic University of Bucharest | Tanase R.,Polytechnic University of Bucharest | Tanase R.,Technical Military Academy | Datcu M.,Polytechnic University of Bucharest | Datcu M.,German Aerospace Center
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2015

Satellite image time series are a valuable resource for enhancing land exploitation by respecting the natural cycles, analyzing urban expansion and its positive and negative effects, limiting the unhealthy rhythm of deforestation, understanding natural hazards and so on. In this context, understanding only the changes in multitemporal images is not sufficient. This paper aims to correlate multi-level change detection techniques with image semantic segmentation methods in order to build an hierarchy of changes for each semantic class. In this way, we are able to provide statistics regarding the levels of change suffered by a certain area. The methods are demonstrated with examples involving bi-temporal Land-sat images. © 2015 IEEE.


Zaharescu T.,INCDIE | Buse F.,Technical Military Academy | Jipa S.,INCDIE | Jipa S.,University Valahia of Targoviste | And 2 more authors.
Materiale Plastice | Year: 2010

The multilayer structure consisting of alternative sheets of paper and ethylene-propylene elastomers was investigated for electrical applications. The changes in the main electrical characteristics, namely volume resistivity, dielectric loss, permittivity were determined for the evaluation of material stability under accelerated degradation promoted by ? irradiation. The satisfactory response of this sandwich structure is illustrated by sample resistivity placed around 1015 Ω.m, permittivity less 2.025 and dielectric loss not higher than 0.04. The correlation between degradation effects and electrical properties is presented.


Creosteanu A.,Technical Military Academy | Creosteanu L.,Polytechnic University of Bucharest
Electrical Systems for Aircraft, Railway and Ship Propulsion, ESARS | Year: 2012

An electronic system is compatible with its electromagnetic environment if it satisfies the following two criteria: it does not emit (unintentional) electromagnetic energy above a certain minimum level, and it is not susceptible to malfunction if unintentional electromagnetic energy below a certain level is incident on it. This paper presents a study on the effect that electromagnetic interference has on the speed sensor an aircraft starter generator. An experimental setup was created to generate the radiated emissions, and results were plotted on the oscilloscope. Results obtained by measurement were also compared to the theoretical results. © 2012 IEEE.


Dobre A.M.,Romanian National Institute for Research and Development for Biological Sciences | Mateescu-Tusa I.,Romanian National Institute for Research and Development for Biological Sciences | Bratosin D.,Romanian National Institute for Research and Development for Biological Sciences | Bratosin D.,Vasile Goldis Western University of Arad | Siposan D.,Technical Military Academy
Digest Journal of Nanomaterials and Biostructures | Year: 2015

Transfusion medicine relies on the possibility of storing red blood cells (RBCs) for a prolonged period of time. A better understanding of the nature of changes in stored RBCs may provide new strategies to improve the balance of benefits and transfusion’s risks. In the light of recent results on the mechanism of programmed cell death of RBCs (erythroptosis), where numerous cellular changes are common hallmarks of the apoptotic phenomenon, we have developed new flow cytometric criteria to evaluate the viability of stored erythrocytes. In order to evaluate the possible benefic effect of low-intensity laser irradiation for increasing the blood preservation period, we irradiated the whole blood from healthy donors in specially designed bags for research purposes by MacoPharma Company containing SAGM medium, and conserved it for 3 weeks. LED (Light emitting diode) (λ=465nm, P=60mW, P/S=100mW/cm2) and laser diode (λ=660nm, P=30mW, P/S=50mW/cm2) in continuous wave have been used as sources of irradiation. Doses were ranged between 0 and 2J/cm3. After that period RBCs were analyzed by flow cytometry for morphological changes (FSC/SSC), apoptosis/necrosis analysis (FITC-annexin-V labeling/PI) and viability using an original Calcein-AM method on a FACScan cytometer using CellQuest Pro software for acquisition and analysis. Complementary, the RBCs integrity was analyzed by scanning electron microscopy (SEM). Morphological changes assessment of red blood cells by flow cytometry and scanning electron microscopy showed a good preservation of the discoidal shape for the irradiated cells compared with control. © 2015, Inst Materials Physics. All rights reserved.


Creosteanu A.,Technical Military Academy | Gavrila G.,Technical Military Academy | Creosteanu L.,Polytechnic University of Bucharest
2012 15th International Symposium on Antenna Technology and Applied Electromagnetics, ANTEM 2012 | Year: 2012

In solving field problems, there are mainly three types of techniques: experimental, analytical, and numerical. Experiments are expensive, time consuming, and usually do not allow much flexibility in parameter variation. In this article we will consider the last two solving methods. Analytical methods are the most rigorous ones, providing exact solutions, but they become hard to use for complex problems. Numerical methods have become popular with the development of the computing capabilities, and although they give approximate solutions, have sufficient accuracy for engineering purposes. The problem we have studied is determining the distribution of electrostatic potential inside a conducting rectangular box having one of the armatures at V 0=1V potential and the other three at 0V potential. Three methods were considered in solving the problem: the separation of variables analytical method, the deterministic finite difference numerical method, and the probabilistic Monte Carlo numerical method. The numerical algorithms were implemented in matlab program. We compared the results to the analytical method, and raised the number of iterations until we reached a 10-10V order difference between last iterations values. The grid step size was also optimized, to minimize the error of the numerical finite difference solutions. This way, the same accuracy was obtained with a much smaller number of iterations. All the results obtained with the numerical methods were compared to the exact analytical solution. © 2012 IEEE.

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