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1
Nanofiltracja - nowoczesne technologie membranowe w uzdatnianiu wody i oczyszczaniu sciekow w przemysle spozywczym
100%
Pietraszek M.
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nr 08
58-59
2
Content available Estimation of the accuracy of laser guided bomb
63%
Kowaleczko G. , Pietraszek M.
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tom Vol. 23, No. 3
271--279
EN
The main goal of the bomb release is to hit the target with a maximum accuracy. Therefore, special active control systems are utilized to improve this accuracy. Some of the most popular are semi-active laser systems of guidance. Selected target is pointed with high-intensity laser by an airborne or ground laser designator. The laser-guided bomb (LGB) tracks this target using on-board laser seeker and adjusts its trajectory. The main task of the control system is to steer the bomb in the way allowing fixing the reflected laser beam in the centre of photo sensor array. This keeps the bomb axis straight toward the target. The aim of this study is to identify factors influencing on the accuracy of the LGB. It was performed for the prototype of LGB, which was designed in the Air Force Institute of Technology. This is the modernized version of the classical LB-10M bomb. Originally, this bomb has only four rear stabilizers and it has been equipped with four additional fins (Fig. 1). These fins allow controlling the bomb's path in active way. Earlier studies have shown that this is the useful method of bomb control both in longitudinal and lateral motions. Analysis proved that range of the bomb can be effectively changed. This paper presents method of flight simulations for released LGB. Calculations were performed using sixdegrees- of-freedom mathematical model of the LB-10M bomb motion. Aerodynamics was calculated using commercial software. Control laws were determined based on signals detected by two pairs of laser sensors. Exemplary results of simulations are submitted and conclusions focused on the main factors influencing on bombing accuracy are shown.
3
Age-related changes in glutamate receptors: an autoradiographic analysis
63%
Wardas J. , Pietraszek M.
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nr 5
4
Modelowanie i symulacja numeryczna dynamiki zrzutu bomby korygowanej
51%
Kowaleczko G. , Pietraszek M. , Grajewski K.
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tom T. 35, nr 66
31--40
PL
W pracy przedstawiono proces modelowania dynamiki oraz wyniki symulacji lotu bomby lotniczej zrzucanej w warunkach spokojnej atmosfery. Opracowano model matematyczny ruchu przestrzennego bomby traktowanej jako bryła sztywna. W obliczeniach wykorzystano charakterystyki masowe i geometryczne opracowanej w Instytucie Technicznym Wojsk Lotniczych bomby ćwiczebnej LBĆw-10, którą poddano modernizacji w celu umożliwienia aktywnego sterowania jej lotem. Charakterystyki aerodynamiczne tej bomby określono, wykorzystując oprogramowanie PRODAS oraz na podstawie wyniku badań przeprowadzonych w tunelu aerodynamicznym. Pokazane przykładowe wyniki obliczeń numerycznych otrzymano z wykorzystaniem autorskiego oprogramowania.
EN
The paper presents a model of the bomb dynamics, which is dropped in calm weather conditions. The description of motion dynamics was based on the model of the rigid body and is dedicated to spatial motion simulation. The mass and geometric characteristics were referred to the LBC-10 training bomb, which had been developed at the Air Force Institute of Technology. Nowadays this bomb is modernized in order to enable the active control of the flight path. The aerodynamic characteristics of this bomb were determined using the PRODAS software and they were also based on the results of the wind tunnel tests. In the paper exemplary results of numerical calculations performed with the author's software are also shown.
5
Content available remote Removal of detergents from industrial wastewater in ultrafiltration process
51%
Kowalska I. , Kabsch-Korbutowicz M. , Majewska-Nowak K. , Pietraszek M.
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tom Vol. 31, nr 3-4
207-220
EN
The aim of the study was to evaluate the suitability of UF membranes for purification and concentration of effluents from detergent production. During preliminary experiments flat-sheet Amicon (the cut-off of 100, 50, 1 and 0.5 kDa) and Intersep (the cut-off of 30, 10 and 4 kDa) membranes were used. Semi-pilot and full-scale cross-flow experiments were performed using Koch/Romicon capillary ultrafiltration mod-ules with polysulfone membranes of the cut-off of 2 and 5 kDa. The results obtained indicate that a decrease of membrane cut-off value improves the efficiency of effluent treatment. The membrane with a cut-off of 0.5 kDa yields the best separation efficiency: the decrease of COD-Cr value is over 85%, which corresponds to COD-Cr of permeate equal to 8800g O2/m3. It has been found that UF capillary modules made by Koch/Romicon are suitable for concentration of highly polluted effluents containing detergents. The modules applied are characterised by stable transport and separation properties. In the course of a long-term concentration of effluents, an essential drop in a permeability was not observed and the permeate quality remained almost constant, although a systematic increase in pollution load of the concentrate occurred.
6
Content available The evaluation of the efficiency of active control system for aerial bomb
51%
Kowaleczko G. , Żyluk A. , Pietraszek M. , Wijaszka M.
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tom Vol. 25, No. 4
165--174
EN
The article presents the results of numerical simulation of a laser-guided bomb, which is dropped in calm weather conditions. The prototype of such a bomb was developed at the Air Force Institute of Technology. It was a result of the modification process of the classical training bomb. The modification consisted of building on the bomb's board a detection system to track targets that are designated by laser and a control system to adjust bomb’s glide path to precisely strike the target. In the simulation research, geometric and mass characteristics of the classical training bomb were used. Aerodynamic characteristics of the bomb have been determined using commercial software PRODAS. Using the mathematical model of the bomb spatial motion and model of the laser detection system series of simulations were performed. The main goal was to determine the effectiveness of the adopted construction solution. Therefore, simulations were performed for various initial positions of the bomb and fixed position of the target. It allowed finding the set of control laws coefficients giving the most accuracy of the bomb. The influence of structural modifications of the detection system on the possibility of effective detection and location of the target was also investigated. In the article, exemplary results of numerical calculations performed with the author's software are also shown.
7
Content available remote Opposite influence of MPEP, an mGluR5 antagonist, on the locomotor hyperactivity induced by PCP and amphetamine
51%
Pietraszek M. , Rogoz Z. , Wolfarth S. , Ossowska K.
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tom 55
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nr 3
EN
Potential antipsychotic effects of a selective non-competitive antagonist of metabotropic glutamate receptor 5 (mGluR5), 2-methyl-6-phenylethynylpyridine (MPEP), was examined in two commonly used screening tests: (1) the hyperactivity induced by an NMDA receptor antagonist phencyclidine (PCP), and (2) the hyperactivity induced by an indirect dopamine agonist, D-amphetamine. PCP was administered at a dose of 2.5 mg/kg s.c. and D-amphetamine was given at a dose of 1 mg/kg s.c. MPEP (5 mg/kg i.p.) significantly enhanced the locomotor activity increased by PCP, but inhibited amphetamine-induced hyperactivity. The opposite effect of MPEP in the two above-mentioned models questions significance of the blockade of mGluR5 receptors to antipsychotic effects.
8
Behavioural characterisation of non competitive mGluR1 and mGluR5 antagonists
45%
Danysz W. , Dekundy A. , Gravius A. , Pietraszek M. , Sevostianova N.
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nr 3
9
Changes in glutamatergic transmission in the fronto-parietal cortex after chronic treatment with neuroleptics in rats
38%
Pietraszek M. , Bijak M. , Golembiowska K. , Wardas J. , Wolfarth S. , Ossowska K.
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nr 3
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