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Tytuł:
Armaty czołgowe rodziny D-81 kalibru 125 mm
Autorzy:
Przeździecki, Paweł (1981- ).
Powiązania:
Nowa Technika Wojskowa 2021, nr 5, s. 26-33 ; 2021, nr 6, s. 24-31
Data publikacji:
2021
Tematy:
Armaty czołgowe
D-81 (armata)
Budowa i konstrukcje
Dane taktyczno-techniczne sprzętu wojskowego
Modernizacja
Amunicja
Artykuł z czasopisma wojskowego
Artykuł z czasopisma fachowego
Opis:
Artykuł dotyczył radzieckiej armaty czołgowej D-81 kalibru 125 mm. Opisano genezę jej powstania, konstrukcję oraz dane taktyczno-techniczne. Omówiono trzy kolejne modernizacje tej armaty. Przedstawiono armaty D-81 produkowane na licencji w innych krajach m.in. w Czechosłowacji, Ukrainie i w Chinach. Opisano także amunicję do tej armaty produkowaną w ZSRR i w Federacji Rosyjskiej.
[Cz. 1-2].
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
The Role of Discretion in Professional Practice
Autorzy:
Wajszczyk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/652658.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
personalistic professionalism in engineering ethics
discretion
human decision making
conscience
truth
A13
D81
Opis:
Various scholars of ethics and economics conduct research on the best modes of decision making which guarantee good outcome and moral behaviour of the individuals involved. Either of the modes considered, rules with regulations or discretion and judgment, find applicability in diversified professional circumstances. The paper investigates how discretion can be used in professional activity by using the Aristotelic-Thomistic framework. Results indicate that such a framework can be used by engineers in their working environments and by other working professionals with the main proposition that only in discretionary decision making is the person able to take full responsibility for the outcomes and to premeditate their moral worth in conscience before resolving to commit the act itself.
Źródło:
Annales. Etyka w Życiu Gospodarczym; 2016, 19, 4
1899-2226
2353-4869
Pojawia się w:
Annales. Etyka w Życiu Gospodarczym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cast Intermetallic Alloys by SHS Under High Gravity
Autorzy:
Sanin, V.
Andreev, D.
Ikornikov, D.
Yukhvid, V.
Powiązania:
https://bibliotekanauki.pl/articles/1503724.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.05.Mh
81.20.Ka
Opis:
Pilot-scale series of cast Ti-Al, Ti-Al-Nb, $(Ni, Co, Mn)Al_x$, Ni-Cr-Al-Si-C, and Co-V-Al-Si-C alloys were produced by thermit-type SHS under high gravity for their potential use as heat-resistant materials, master alloys, precursors for catalysts, etc.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 331-335
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Field Assisted Sintering Technique Compaction of Ultrafine-Grained Binderless WC Hard Metals
Autorzy:
Dopita, M.
Salomon, A.
Chmelik, D.
Reichelt, B.
Rafaja, D.
Powiązania:
https://bibliotekanauki.pl/articles/1419115.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.05.Mh
81.07.-b
81.20.-n
81.20.Ev
62.20.Qp
62.20.mm
Opis:
Tungsten carbide (WC) powder having a crystallite size around 55 nm and the Brunauer-Emmett-Teller specific surface area 2.75 $m^2//g$ was sintered using the field assisted sintering/spark plasma sintering technique. Sintered samples were investigated using different analytical methods providing detailed information on the microstructure and mechanical properties of materials. Density and porosity of specimens were determined using the Archimedes principle and optical and scanning electron micrographs. The X-ray diffraction investigations provided the information on the crystal real structure and crystallite sizes. The electron backscatter diffraction measurements yielded the details about the grain size, frequency, and distributions of grain boundaries. Finally, the essential mechanical properties of sintered samples were obtained from the hardness and fracture toughness measurements. The influences of individual sintering conditions: sintering temperature and sintering time especially, on the microstructure and mechanical properties of sintered specimens were derived. Fully compact samples having the Vickers hardness HV10 around 29 GPa and fracture toughness $K_{Ic}$ approximately 7.2 MPa $m^{1//2}$ were sintered from temperatures of 1800C and holding times 1 min. Specimens sintered at lower temperatures showed lower density which resulted in a significant drop in the sample hardness.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 639-642
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of W-Cu-Ni Electrical Contact Materials with Enhanced Mechanical Properties by Spark Plasma Sintering Process
Autorzy:
Lungu, M.
Tsakiris, V.
Enescu, E.
Pătroi, D.
Marinescu, V.
Tălpeanu, D.
Pavelescu, D.
Dumitrescu, Gh.
Radulian, A.
Powiązania:
https://bibliotekanauki.pl/articles/1194545.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.16.-c
81.05.Ni
81.07.Wx
81.20.Ev
Opis:
This study reports on the development of some W-Cu-Ni materials for use as electrical contacts for low voltage vacuum switching contactors for nominal currents up to 630 A. The contact materials with 85 wt% W, 12-14 wt% Cu and 1-3 wt% Ni were obtained by spark plasma sintering process in vacuum. From very finely dispersed W-Cu-Ni powder mixtures there were produced sintered electrical contact pieces that were investigated in terms of physical, microstructural, mechanical, and functional properties. The material sintered at 1200C exhibited a near fully dense structure with very low porosity and enhanced mechanical properties: hardness of maximum 480 HV1 and elastic modulus of maximum 220 GPa and low chopping current of maximum 1.77 A.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 327-330
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Crystal Growth of SrPrGaO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$
Autorzy:
Uecker, R.
Reiche, P.
Ganschow, S.
Uecker, D.-C.
Schultze, D.
Powiązania:
https://bibliotekanauki.pl/articles/1964229.pdf
Data publikacji:
1997-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.30.Dz
81.10.Fq
81.05.Je
Opis:
Single crystals of SrPrGaO$\text{}_{4}$ and SrLaGaO$\text{}_{4}$ have been grown using the Czochralski technique. Both materials melt incongruently at 1462°C and 1516°C. The non-stoichiometric crystals contain more strontium than the starting melts. Constitutional supercooling is retarded by special growth conditions and optimum melt composition. Because of their small mismatch both crystals are recommended as substrates for YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$ epitaxy.
Źródło:
Acta Physica Polonica A; 1997, 92, 1; 23-34
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Single Mode High Refractive Index Optical Fibres
Autorzy:
Dorosz, D.
Barczak, K.
Pustelny, T.
Dorosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1811520.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.81.Pa
42.81.-i
42.81.Qb
Opis:
The present paper is focussed on the search of technology of new kinds of optical fibers characterised by good magnetooptical properties. The elaborated optical fibres are to apply in optical sensors of electric current and the magnetic field. In result of these researches and analyses a new optical fibre was put forward. Such optical fibers were designed, produced and subjected to extensive tests. This paper presents the results of investigations that were carried out as well as the parameters of the tested structures.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-63-A-68
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Phase Transformation and Sintering of Algeria Clay Powder
Autorzy:
Beddiar, L.
Sahnoune, F.
Heraiz, M.
Redaoui, D.
Powiązania:
https://bibliotekanauki.pl/articles/1033574.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Mh
81.70.Pg
81.30.Mh
Opis:
Clay is one of the most used natural materials in the ceramic industry with various applications such as pottery, tiles, cement and bricks. The latter are used as a building material because of their excellent thermal and mechanical properties. In the present study, Algerian clay from Al-maathed area, M'sila district, was used to prepare bricks. The chemical composition of the clay was determined using X-ray fluorescence. Firing of clay was carried out in the temperature range 20-1000°C, at different heating rates. The present phases and their transformations, the activation energy, and the sintering mechanism were evaluated using X-ray diffraction, differential thermal analysis, thermogravimetric analysis and dilatometry. The activation energy for the sintering mechanism obtained from non-isothermal treatments is 420 kJ/mol. The value of the Avrami exponent, n, is determined from the shape of the crystallization exothermic dependence. It is related to m parameter (a numerical factor which depends on the dimensionality of crystal growth) obtained by Matusita method. Both of which are about 1.2 for clay sintering. These values indicate that bulk nucleation is dominant in clay sintering by three-dimensional growth, with polyhedron-like morphology controlled by interface reaction.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 566-568
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Internal Barrier Layer Capacitance Effects in Neodymium Copper Tantalate Ceramics
Autorzy:
Szwagierczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/1491313.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.22.-d
81.05.Je
81.20.-n
84.32.Tt
84.37.+q
Opis:
A new perovskite material $Nd_{2//3}CuTa_4O_{12}$ was applied as a naturally formed internal barrier layer capacitor. The powder prepared by solid state synthesis and ball milling was pressed into pellets and sintered at 1180-1220°C. Dielectric properties of ceramic samples were characterized by impedance spectroscopic studies carried out in the temperature range from - 55 to 700C at frequencies 10 Hz ÷ 2 MHz. Two types of the dielectric response were revealed - a high frequency response attributed to grains which occurred at low temperatures, and a low frequency one related to grain boundaries which dominated at higher temperatures. Resistances and capacitances of grains were found to be two orders lower than those of grain boundaries. Two plateaus were observed in the dielectric permittivity versus frequency plots - a low frequency step corresponding to a high value of $10^4$ and a high frequency step at a level of 40. Scanning electron microscopy observations and energy dispersive spectroscopy analysis confirmed that $Nd_{2//3}CuTa_4O_{12}$ ceramics were composed of semiconducting grains and insulating oxygen-enriched grain boundaries. The formation of such an electrically heterogeneous system during the one step fabrication process in air leads to spontaneous internal barrier layer capacitance effects responsible for a high and relatively stable dielectric permittivity of the developed material.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 205-207
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raman Studies of ZnO Products Synthesized by Solution Based Methods
Autorzy:
Gültekin, D.
Akbulut, H.
Powiązania:
https://bibliotekanauki.pl/articles/1398789.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Fs
81.07.Bc
81.07.-b
81.20.Fw
Opis:
In this study, nanostructured ZnO thin film coatings produced by sol-gel method have been examined and characterized. ZnO thin film coatings synthesized by the preparation of ZnO sols in the liquid phase from homogeneous solutions with precursor of zinc acetate dihydrate (Zn(CH₃COO)₂·2H₂O). Ethanol (C₂H₅OH) has been used as a solvent material and monoethanolamine (MEA) has been used as a complexing agent. The final solutions have 0.1, 0.3, 0.5, 0.7 and 1 molar concentrations. General morphologies and detailed structural characterizations have been obtained by using scanning electron microscope (SEM). Qualitative analyses of the synthesized coatings were performed using X-ray diffraction (XRD) and Raman spectroscopy. The Raman spectroscopy studies of precursor, solution and final products were carried out to investigate transformation of the chemical compounds from the initial material to the final coating.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 803-805
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasicrystal-Polymer Composites for Additive Manufacturing Technology
Autorzy:
Kenzari, S.
Bonina, D.
Degiovanni, A.
Dubois, J.
Fournée, V.
Powiązania:
https://bibliotekanauki.pl/articles/1202916.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.05.Qk
81.05.Zx
81.20.Ev
83.80.Ab
89.20.Bb
Opis:
We present a new niche application of quasicrystalline powders that leads to a commercially successful development of polymer-matrix composites. The process is based upon selective laser sintering, which is one of the current most powerful additive manufacturing technologies in use in the mechanical industries. Characteristics of the materials produced, such as porosity, friction and wear against hard steel, are evaluated and compared to the state of the art. Insight into the production of metal-matrix composites, using a variant of the technology, is also given.
Źródło:
Acta Physica Polonica A; 2014, 126, 2; 449-452
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrochemical Impedance of Sn Nanowire Arrays
Autorzy:
Kaya, H.
Aydogmus, E.
Avcu, D.
Powiązania:
https://bibliotekanauki.pl/articles/1218401.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.07.Gf
81.15.Pq
82.80.Fk
Opis:
In this study, Sn nanowires were produced electrochemically in anodic aluminum oxide membranes. During the deposition process some parameters such as ion content, pH, deposition time, and temperature of solution were kept constant. The scanning electron microscope results showed that the diameters of produced tin nanowires were approximately 300 nm and their lengths were about 8-10 μm. Electrochemical impedance studies of Sn nanowire arrays were also studied by Iviumstat galvanostat/potentiostat system.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 307-309
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of the inter-operation annealing of cold-drawn eutectoid steels
Autorzy:
Grygier, D.
Rutkowska-Gorczyca, M.
Żak, A.
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/1075902.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Bx
81.40.Ef
81.70.Bt
Opis:
The test of the results presented in this paper has demonstrated that the most suitable recrystallizing annealing temperature for cold drawn eutectoid steels is 700°C. The microscopic examinations, with the use of scanning electron microscopy and transmission electron microscopy and the results of mechanical properties tests have shown that only at this temperature it is possible to obtain the fully recrystallized homogeneous fine-grained structure of the pearlitic steel.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 931-934
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Aspects of Processing and Properties of Composite Material with Si-C Particles
Autorzy:
Nedelcu, D.
Carcea, I.
Tabacaru, L.
Ciofu, C.
Powiązania:
https://bibliotekanauki.pl/articles/1503738.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Mh
81.05.Ni
81.05.Pj
81.05.Qk
12.60.Rc
Opis:
The processing of composite materials with metal matrix reinforced with carbon particles, graphite or SiC (Silicon Carbide) is decisively determined by the transfer of the reinforcing particles from the gaseous atmosphere into the molten metal and then by their transfer from liquid into solid. The degree of incorporation, the uniformity of particle distribution and finally all the properties of the composite materials depend on the way in which the transfer conditions from one phase to another have been accomplished. According to the thermodynamic principles, the transfer of the reinforcing particles from one phase to another can happen without external energy input only if the variation of the total free enthalpy is negative. The estimation of the direction of transfer can be done after the determination of critical measurements to the balance of forces that act on the reinforcing element. The particles wetted by the liquid metal and with density of its nearest will be integrated in the melt without external energy input, and those dry and light need additional energy consumption (powder injection, melt stirring etc.). The stalling speed of the SiC particles to the gas/liquid interface is influenced by the density difference and the reinforcing particles size. The critical moving speed of the solidification front is decisively influenced by the difference between $σ_{PS}$ and $σ_{PS}$, inter-phase tensions, as well as by the reinforcing particles size, if their density significantly differs from the one of the liquid alloy. Compared with the initially used alloy, the pull strength is doubled for some samples of obtained composite material. The ultrasonic testing disclosed the presence of some very small spots (porosities) which don't have a major influence on the tensile specimens subjected to pulling. From this reason, a very clear display of the bottom echo can be observed, which justifies the uniformity of the casting process. At the level of the matrix, the presence of the carbon to the separation limit between matrix and reinforcement can be observed, which confirms that during the processing Aluminium Carbide $Al_{4}C_{3}$ has been formed. The presence of these carbides considerably improves the wetting process.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 344-347
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 349

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