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1
Content available remote

SiO_{2} Layer Charge State Variation in Fowler-Nordheim Tunneling Regime

100%
Strzałkowski I., Kowalski M.
Acta Physica Polonica A
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1997
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vol. 92
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issue 3
585-590
EN
The charge build-up and its changes in the amorphous SiO_{2} layer incorporated into a Si MOSFET as a gate oxide due to Fowler-Nordheim tunneling electron injection were investigated. Electron and hole trapping/detrapping by native and generated trap centres were studied by monitoring the charge state of the SiO_{2} traps by means of a drain-source current versus gate-source voltage technique. New interesting effects were observed and their possible mechanisms are presented.
2
Content available remote

A Quantum Key as the Fiber Optic Security Sensor

100%
Życzkowski M., Kowalski M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
606-609
EN
The paper describes the methodology of identifying an interference in the optical fiber. The paper presents the technology widely known as quantum key distribution. The quantum key distribution is based on the technique of constant comparison of quantum characteristics of the input light source and its characteristics at the end of the fiber optic. Methodology of presented work includes the evaluation of the functional objectives through the constructive assumptions for the laboratory models development. This paper presents the model of a system based on the comparison of polarization states of light quanta using two asymmetric Mach-Zender interferometers as transmitting and receiving systems to enable compensation of polarization state changes at the input and output of the fiber optics sensing cable. Continuous monitoring of the state of the reference signal, the specific changes of natural or ambient effects on the fiber will attempt to identify interference in the optical waveguide as a change of the polarization of the quantum states of the light. The authors indicate the possibility of using such fiber optic sensor as a security sensor to protect the extensive critical infrastructure facilities. In this article the future research conception of using compressed sensing algorithms for data compression in quantum key distribution systems is presented.
3
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Electric Field Stimulated Emission of Electrons from Deep Traps in SiO_{2}

81%
Strzałkowski I., Marczewski M., Kowalski M., Jastrzębski C.
Acta Physica Polonica A
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1993
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vol. 84
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issue 4
701-704
EN
An electric field induced electron tunneling emission from deep traps and an energy distribution of trap levels in VLSI grade SiO_{2} layers have been studied using a new isochronal - EFSE - technique. A broad spectrum with a density of trap states peak at about 1.9 eV was observed for the first time. The experiment proved the importance of an electron trap-to-band tunneling emission in SiO_{2}.
4
Content available remote

Measurement Stand for TeraEYE Inspection

81%
Piszczek M., Kowalski M., Szustakowski M.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
720-724
EN
Image fusion can be used as one of imaging methods. Connection of images acquired using different acquisition methods can deliver information invisible for traditional one imaging technique. Visible and thermal images connected in one image give information about shapes and temperature map of objects seen by cameras. If we connect stereoscopic visible image and thermal image we will have three-dimensional object model covered with temperature map. Dividing three-dimensional objects on elementary surfaces we can model this object energetically. Energetic modeling of measurement scene allows verifying measurement data acquired from devices working in terahertz frequency range. This method requires many measurement scene parameters to be registered. Some of these parameters can be used in a hybrid modelling process.
5
Content available remote

Hidden Object Detection System Based on Fusion of THz and VIS Images

81%
Kowalski M., Palka N., Piszczek M., Szustakowski M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
490-493
EN
Terahertz imaging makes it possible to acquire images of objects concealed underneath clothing by measuring the radiometric temperatures of different objects on a human subject. Finding objects hidden under clothes is one of key issues of public places security. A possible solution of this problem is a multispectral, terahertz-based screening system with implemented image fusion algorithm. The result of the fusion is a new image which gives more information and is more suitable for human perception. An imaging system is usually composed of various subsystems. Many of the imaging systems use imaging devices working in various spectral ranges. The aim of our studies is to detect and visualize objects hidden under clothing. Detection of potentially dangerous objects is important, but without proper visualization, can be difficult to utilize. Our goal is to build a system harmless to humans for screening and detection of hidden objects using a THz and VIS cameras. The presented system draws attention not only on the properties offered by a single camera but also on the potential of synergetic effects of the system by using the fusion of data registered by different sensor units. In this paper we present the multispectral passive imaging system for hidden threats visualization based on THz and VIS cameras.
6
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Content available

Identification of Residual Stress Phenomena Based on the Hole Drilling Method in Explosively Welded Steel-Titanium Composite

81%
Karolczuk A., Kowalski M., Kluger K., Żok F.
Archives of Metallurgy and Materials
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2014
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issue 3
7
Content available remote

The Role of a Laser Photography Device Illuminator in Acquisition of Spatial Information

71%
Piszczek M., Kowalski M., Szustakowski M., Rutyna K., Ludwikowski K.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
862-865
EN
The paper is concerned with practical studies of illuminator role in the process of acquisition of spatial information with use of laser photography device. The laser photography device working according to the time-spatial framing method needs both acquisition and illumination process to happen in a very short-time. Fulfillment of both conditions is necessary for proper operation of this device. Using a specialized laser illuminator determines the growth of information potential of the laser photography device and allows reducing parasitic impact of daylight. The presented solution not only improves typical vision systems parameters but it introduces new quality for imaging devices.
8
Publication available in full text mode
Content available

Microstructure And Texture Evolution During Cold-Rolling In The Fe-23Mn-3Si-3Al Alloy

71%
Kowalska J., Witkowska M., Zielińska-Lipiec A., Ratuszek W., Kowalski M.
Archives of Metallurgy and Materials
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2015
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issue 3
9
Content available remote

On Trap Generation in SiO_{2} Films of Si MOSFETS by Hot Electrons

71%
Strzałkowski I., Marczewski M., Kowalski M., Jastrzębski C., Bąkowski A.
|
EN
Trap generation in amorphous SiO_{2} films with thickness about 500 Å was studied by nonavalanche injection of hot electrons. The trap density, the electron capture cross-section of native and generated traps and the effective trap generation constant for the oxide fields of 1-4 MV/cm, injected charge density up to 3 × 10^{19} e/cm^{-2} and injected current density in the range 2-300 μA/cm^{2} were determined and discussed.
10
Content available remote

Laser Photography Device - Spatial Parameters of Imaging

62%
Piszczek M., Kowalski M., Karol M., Rutyna K., Zarzycki M., Szustakowski M., Ludwikowski K.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
550-553
EN
Laser photography device is an imaging device developed in the Institute of Optoelectronics, Military University of Technology and it is an example of modern image acquisition device. The laser photography device allows to define a 3D observation scene thanks to short-time scene illumination and image acquisition method. This device works according to time-spatial framing method. In the paper, basics of time-spatial framing method are explained. Special attention is given to time parameters of device and their influence to spatial parameters of registered images. In this paper the laser photography device and results of chosen experiments are presented and described. Experimental results presented in the paper show the potential and possibilities of using the laser photography device as a camera for observation and measurement applications.
11

Lack of relationship between serum content of MBL, sCD14, anti-PPD and anti-Hsp65 IgG, and ingestion of Mycobacterium bovis BCG bacilli by phagocytes

52%
Paziak-Domanska B., Bonar A., Kowalewicz-Kulbat M., Klink M., Kowalski M., Karhukorpi J., Karttunen R., Jurkiewicz M., Rozalska B., Rudnicka W.
Archivum Immunologiae et Therapiae Experimentalis
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2002
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vol. 50
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issue 5
337-344
EN
Prophylactic vaccination against tuberculosis (TB) with a live attenuated strain of Mycobacterium bovis Bacille Calmett?e-Gerin (BCG) has been used worldwide. However, TB remains one of the most significant diseases of humans and animals. Better understanding of the mechanisms of human immunity to mycobacteria is essential for development of new vaccines and estimation of their efficacy. In this study we determined the levels of known humoral mediators of mycobacterial phagocytosis - mannose binding lectin (MBL), soluble CD14 (sCD14), antibodies of IgG class against mycobacterial purified protein derivative (PPD) and mycobacterial Hsp65 antigen, in the sera from healthy young volunteers vaccinated with BCG and presenting positive and negative Mantoux responses to PPD. Than we asked a question as to whether macrophages and polymorphonuclear leukocytes (PMNs) from the individuals with positive (TT(+)) and negative (TT(-)) tuberculin tests differ by the ability to ingest mycobacteria. Also we were looking for a relation between the intensity of mycobacterial ingestion by phagocytes in the medium with autologous sera containing different concentration of MBL, sCD14 andf anti-mycobacterial IgG. We found no significant differences between the investigated parameters for TT(+) and TT(-) volunteers. Our result suggest that ability of macrophages and PMNs to ingest mycobacteria depends on an individual intrinsic capacity of phagocytes.
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