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Wyświetlanie 1-15 z 16
Tytuł:
Preparation of Silicon Oxycarbide Composites Toughened by Inorganic Fibers via Pyrolysis of Precursor Siloxane Composites
Autorzy:
Strachota, A.
Černý, M.
Glogar, P.
Sucharda, Z.
Havelcová, M.
Chlup, Z.
Dlouhý, I.
Kozák, V.
Powiązania:
https://bibliotekanauki.pl/articles/1503708.pdf
Data publikacji:
2011-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Je
81.05.Mh
82.30.Lp
Opis:
The optimization of silicon oxycarbide (SiOC) synthesis (sol-gel/pyrolysis) is described, starting from methyltriethoxysilane, dimethyldiethoxysilane, tetraethoxysilane, ethyltriethoxysilane and propyltriethoxysilane. Variation of final elemental composition was tested via change of monomer ratios and combinations. The main aim was to achieve low weight losses during cure and pyrolysis and high micromechanical properties. Gas chromatography and mass spectroscopy was used to analyse the by-products of cure and pyrolysis, indicating a prominent role of cyclosiloxane and polyhedral oligomeric silsesquioxane (POSS) oligomers. Best results were obtained with high contents of methyltriethoxysilane in the monomers mixture.
Źródło:
Acta Physica Polonica A; 2011, 120, 2; 326-330
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling of thermal processes in the solar air heater
Autorzy:
Zhelykh, V.
Kozak, C.
Powiązania:
https://bibliotekanauki.pl/articles/2068294.pdf
Data publikacji:
2014
Wydawca:
Politechnika Częstochowska
Tematy:
energia słoneczna
słoneczny grzejnik powietrzny
pojemność cieplna
przepływ ciepła
kolektor słoneczny
instalacja solarna
solar energy
solar air heater
heat capacity
heat flow
solar collector
solar heating system
Opis:
The article sets out the place of solar energy in the world today. There are provided basic advantages and disadvantages of air quality heat capacity for solar heating system. Data for modeling heat flow system with passive energy use have been presented. Discussed methodology allows to determine the thermal characteristics of the air in the collector of the passive use of solar energy.
Определено энергетическое положение в мире в настоящее время. Поданы основные преимущества и недостатки воздуха в качестве теплоносителя для солнечной системы отопления. Представлены данные по применению теории графов для моделирования тепловых потоков в пассивном солнечном воздухонагревателе. Приведена методика определения тепловых характеристик воздушного гелиоколлектора с пассивным использованием солнечной энергии.
Źródło:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2014, 20 (170); 285--289
0860-7214
Pojawia się w:
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hazard of Runaway of Nitration Processes in Nitrocompounds Production
Autorzy:
Kozak, G. D.
Raikova, V. M.
Powiązania:
https://bibliotekanauki.pl/articles/357950.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
runaway
nitration
oxidation
detonation
failure diameter
sulfuric acid
Opis:
Hazard of runaway of nitration processes in nitrocompounds production was investigated. Temperature rise in DNT nitration mixes under near adiabatic conditions was measured, and derivative dT/dζ was computed. Heat evolution rate caused by nitration (primary reaction) and oxidation (secondary reaction) were examined by means of elaborated mathematical model. Limiting values of T and dT/dζ for safe process were determined. The second part of investigation concerns detonability of solutions of nitrocompound in sulfuric acid. The detonation failure diameter df and detonation velocity D of solutions of trinitrotoluene, dinitrotoluene, and trinitrobenzene in sulfuric acid and oleum have been measured in the wide range of concentrations at T = 90C. It was shown that the detonability of the nitrocompounds depends signifcantly on the sulfuric acid content. The minimum value of df for the mixture TNT/oleum is about 2 mm, i.e., 30 times less, than that for melted TNT, and practically equals to df of nitroglycerine.
Źródło:
Central European Journal of Energetic Materials; 2010, 7, 1; 21-32
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detonability of Ammonium Nitrate and Mixtures on Its Base
Autorzy:
Kuzmin, V.
Kozak, G.
Mikheev, D.
Powiązania:
https://bibliotekanauki.pl/articles/357972.pdf
Data publikacji:
2010
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
improvised explosive
ammonium nitrate
detonability
failure detonation diameter
Opis:
Quantities of improvised explosive devices on a base of industrial explosives that were applied at criminal incidents or were withdrawn from illegal circulation were reduced on average on 9% during last decade. This tendency is explained in particular by toughening of control under circulation of commercial explosive devices. The most commonly used improvised explosives according to returns of The Forensic Science Center of Ministry of Internal Affairs are mixtures on a base of ammonium nitrate with organic fuels and aluminum powder. Quantitative and qualitative compositions of such improvised mixtures can be various. The most essential question for a criminal case investigator is argument that excepted substance is explosive one. In this connection detonability of the mixtures on base fne (particle size was near 20 microns) and granulated ammonium nitrate with some organic fuels and aluminum powder was experimentally investigated. Failure detonation diameters of systems were measured experimentally.
Źródło:
Central European Journal of Energetic Materials; 2010, 7, 4; 335-343
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Thermophysical Processes in Ground-air Heat Exchangers of the Geothermal Ventilation System
Procesy cieplno-fizyczne w gruntownym wymienniku ciepła geotermalnego systemu wentylacji
Autorzy:
Zhelykh, V.
Savchenko, O.
Kozak, C.
Powiązania:
https://bibliotekanauki.pl/articles/2065452.pdf
Data publikacji:
2016
Wydawca:
Politechnika Częstochowska
Tematy:
ground-air heat exchanger
geothermal ventilation
heat transfer
heat balance
wymiennik ciepła ziemia-powietrze
wentylacja geotermalna
bilans cieplny
wymiana ciepła
Opis:
Heat transfer processes that occur when working the ground-air heat exchanger of geothermal ventilation system are considered in this article. The heat balance in the elementary volume of ground-air heat exchanger is proposed on the basis of thermophysical processes. The main factors that affect the process of heat transfer between the outside air and soil was been determined. Initial conditions, which can be used in mathematical and physical modelling of horizontal ground-air heat exchangers for geothermal ventilation systems were selected article presents the experimental study for determining the intensity of radiant energy in the zone irradiated by infrared heaters with their parallel arrangement in relation to the distance between them.
W artykule rozpatrzono procesy wymiany ciepła zachodzące podczas pracy w gruntowym wymienniku ciepła geotermalnego systemu wentylacji. Na podstawie procesów cieplno-fizycznych zaproponowano model bilansu cieplnego w elementarnej objętości gruntownego wymiennika ciepła. Określono główne czynniki, które wpływają na proces wymiany ciepła między gruntem i powietrzem zewnętrznym. Wyznaczono warunki początkowe, które mogą być wykorzystane przy matematycznym i fizycznym modelowaniu poziomych gruntownych wymienników ciepła w systemach wentylacji geotermalnej.
Źródło:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2016, 2 (18); 103--109
2299-8535
2544-963X
Pojawia się w:
Budownictwo o Zoptymalizowanym Potencjale Energetycznym
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Informational resources processing intellectual systems with textual commercial content linguistic analysis usage constructional means and tools development
Autorzy:
Chyrun, L.
Vysotska, V.
Kozak, I.
Powiązania:
https://bibliotekanauki.pl/articles/411309.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
informational resource
commercial content
content analysis
content monitoring
content search
e-content commerce system
Opis:
The article content lies in solving the important applied scientific problem of the informational resources processing intellectual systems (IRPISes) with textual commercial content linguistic analysis usage creation. The IRPISes functioning mathematical ensuring was developed. The IRPISes construction means and methods will be developed on the basis of created mathematical models. Such systems have the widespread usage, in particular for the forming, managing and maintenance of the expanding content volume in Internet, running e-business, during the online and offline content realization systems, cloud storage and cloud computing. The increase in the content volume causes the proper quality and productivity evaluation of the very content author. The increase in the evaluation criterions allows covering the broader aspect range of any author’s / moderator’s work.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 2; 87-98
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Błędy metodyczne pomiaru temperatury powierzchni przetwornikami termoelektrycznymi
The methodical mistakes of surface thermometry by means of thermoelectric transducers
Autorzy:
Jacyszyn, S.
Kozak, O.
Skoropad, P.
Parakuda, V.
Powiązania:
https://bibliotekanauki.pl/articles/155048.pdf
Data publikacji:
2006
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
termometria
szum
powierzchnia
fluktuacja
termodynamika
efekty termoelektryczne
thermometry
noise
surface
fluctuation
thermodynamics
thermoelectric effects
Opis:
W artykule przedstawiono analizę problemu zwiększenia precyzji czujników termoelektrycznych przy mierzeniu temperatury powierzchni.
It was presented the analysis of thermoelectric transducer accuracy for surface measurement.
Źródło:
Pomiary Automatyka Kontrola; 2006, R. 52, nr 12, 12; 48-49
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forensic Investigation of Some Peroxides Explosives
Autorzy:
Kuzmin, V. V.
Solov'ev, M. Y.
Tuzkov, Y. B.
Kozak, G. D.
Powiązania:
https://bibliotekanauki.pl/articles/358555.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
peroxide
methods of analysis
traces
volatilize
detonation
Opis:
Some of pe roxide s : t r i a c e tone t r ipe roxide (TATP) , hexamethylenetriperoxidediamine (HMTD) have been used recently as "irregular" explosives for delinquency and international terrorism purposes. The intimate knowledge of properties and methods of analysis of these substances is necessary for experts. Forensic investigations of some peroxides explosives: triacetonetriperoxide (TATP) and hexamethylenetriperoxidediamine (HMTD) were carried out in this work. The detonation process of peroxides initiation by means of pyroxylin layer ignition was investigated, velocity of detonation at apparent density (ρ HMTD = 0.38 g/cm3, ρ TATP = 0.47 g/cm3) was measured by means of a Russian fotoregister GFR-3. These data were compared with literature detonation velocity values that had been measured at larger densities. The values of detonation velocities complement each other rather well, linear dependencies of D vs. ρ found at densities ρ = 0.35-1.2 g/cm3. The high sensitivity of the investigated analytical methods, that were applied (10-5 -10<-8 g) facilitate the determination of possible times for finding traces of TATP after an explosion. Time t = 6 hours after explosion is the critical time for finding peroxides traces of TATP on a metal surface by means of analytical methods used in this work.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 3-4; 77-85
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Explosion Hazard of Aromatic Organic Compounds Containing One or Two Nitrogroups
Autorzy:
Kozak, G. D.
Vasin, A. Y.
Dyachkova, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/358839.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
aromatic
decomposition
heat explosion
azo-dye
Opis:
Aromatic compounds containing one or two nitrogroups use in chemical industry commercially, in the first place there are mono- and di- nitroderivatives of benzene and toluene. Some industrial incidents at heat selfignition of them, and explosive properties of them were discussed in literature. This investigation deals with explosion hazard of less investigated in this regard class nitrocompounds - azo-dyes. All azo-dyes contain azo or amino groups, two benzene circles with substituents. Some of them contain one or two nitrogroups. Nitro- and azo- groups can give explosion hazard to organic substance. Temperature of fast decomposition beginning at heating and kinetic parameters of slow decomposition were experimentally measured for nine of them. The enthalpies of formation were measured experimentally, and explosion parameters were calculated for three of them. These results gave an opportunity to calculate the temperatures of heat explosion on a base of fundamental theory of heat explosion at convection heat transfer with environment. It was found that calculated temperatures of heat explosion agreed with experimental temperatures of fast decomposition beginning at heating, the divergence was 4.5% on average. Thus it was shown that investigated azo-dyes were the weak explosives, and theory of heat explosion could be quite applied to them.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 2; 49-55
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cast Porous Charges on a Base of Ammonium Nitrate-Urea Eutectic
Autorzy:
Litovka, O. B.
Kozak, G. D.
Chugreeva, E. Y.
Starshinov, A. V.
Powiązania:
https://bibliotekanauki.pl/articles/358034.pdf
Data publikacji:
2008
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
eutectic
ammonium nitrate
urea
fusion diagram
detonability
detonation velocity
Opis:
There are great number tasks of explosive technique, requiring the charges with low pressure and detonation velocity. Powerful tool of regulation of these parameters is lowering of charge density. The main goal of this work is elaboration of technology of manufacture and investigation of explosive properties of charges on a base of eutectic ammonium nitrate-urea mixtures (AN/UR) that have melting point T[m] < 100 C. The physicochemical properties of these mixtures were investigated by means of DSC method and fusion diagram of them was plotted. The composition AN/UR 80/20, that has Tm= 80-90 C was chosen for subsequent investigation. The molten composition was mixed with fine aluminum powder, portion of it was placed into paper tube. The level of a liquid was less than length of the tube. Crystallization of melted mixtures was carried out in vacuum chamber, the level of liquid increased at pumping because of expansion of air bubbles introduced with aluminum particles and reached the upper cork of tube. In such a way porous charges were formed. The dependence of charge density vs. population of tubes by melted mixtures was plotted. Calculated heat explosion of mixtures at content of aluminum Al = 10-15% is Qv = 4.5-5.3 MJ/kg, calculated detonation velocity at density ρ = 0.5-1 g/cm3 changes from D = 3.2 to 5.2 km/s. Detonability of charges was investigated experimentally. Failure diameter (df) of detonation was measured, it was df = 22 mm (ρ = 0.6-0.7 g/cm3) for charges without confinement at initiation by means of booster or blasting cap.
Źródło:
Central European Journal of Energetic Materials; 2008, 5, 2; 57-66
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation of Perspective Composite Coatings by Ion-Beam Assisted Deposition
Autorzy:
Komarov, F.
Pilko, V.
Pogrebnjak, A.
Karvat, C.
Kiszczak, K.
Kozak, C.
Powiązania:
https://bibliotekanauki.pl/articles/1400425.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Nq
Opis:
TiAlN, TiSiN, and TiCrN composite layers were deposited by magnetron sputtering and sliding - angle ion beam sputtering of the inner surface of hollow truncated cones of different compositions. The composition of both type coatings and component depth distributions were studied by the Rutherford backscattering spectrometry. The structural and phase analyses of the deposited films were performed by transmission electron microscopy and diffraction. Microhardness, wear resistance and friction coefficient of the coatings were also measured and discussed in the relationship with the structure and composition. Microhardness tests showed that the registered data varied in the range 10 to 50 GPa, depending on composition and concentration of components. The best wear protection results from the magnetron deposited Ti-Al-N systems in a narrow range of component concentrations. A minimal friction coefficient was revealed for the magnetron sputtered layers.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 800-803
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Properties of $Zn-Ni-SiO_2$ Coating Deposited under X-ray Irradiation
Autorzy:
Poliak, N.
Anishchik, V.
Valko, N.
Karwat, C.
Kozak, C.
Opielak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1378243.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.70.Bt
Opis:
Using X-ray microanalysis and scanning electron microscopy $Zn-Ni-SiO_2$ plating containing $SiO_2$ nanoparticles were studied. It was found that X-ray irradiation of the electrolyte leads to the increased Ni concentration in $Zn-Ni-SiO_2(X)$ films and the grain size is also increasing (the grain size is twice that in the unirradiated case). A thickness of $Zn-Ni-SiO_2(X)$ plating is 20 μm and a thickness of the $Zn-Ni-SiO_2$ plating is about 15 μm. The surface morphology was studied using AFM method. Increasing Ni concentration and $Ni_5Zn_{21}$ phase due to X-Ray irradiation of the electrolyte leading to the improved mechanical properties of the coating.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1415-1417
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tibial tuberosity. Trochlear groove distance in symptom-free young subjects and the proposal for a new guideline value to evaluate patellofemoral pain syndrome in case of trochlea dysplasia
Autorzy:
Alk, A.
Bantle, V.
Martin, T.
Wang, R.
Kasprzyk, M.
Kozak, J.
Powiązania:
https://bibliotekanauki.pl/articles/2063813.pdf
Data publikacji:
2018
Wydawca:
Międzynarodowe Stowarzyszenie na rzecz Robotyki Medycznej
Tematy:
zespół bólu rzepkowo-udowego
kolano biegacza
mobilny system ultrasonograficzny oparty na smartfonie
patellofemoral pain syndrome
PFPS
TT-TG
smartphone-based mobile sonography system
Opis:
For the evaluation of the patellofemoral pain syndrome (PFPS) the mediolateral distance between the tibial tuberosity and the trochlear groove (TT-TG) is considered as the gold standard. In this work, we propose to replace the measurement of the TT-TG with conventional tomographic or radiological section images by a smartphone-based mobile sonography system. This new system allows to provide not only ultrasound imaging but also a measuring method for determining the TT-TG using a smartphone as a mobile tracking unit. Moreover, the system supports the diagnosis by acquiring an additional parameter: the mediolateral distance between the intercondylar notch and the tibial tuberosity (TT-IN). The distinctive structure of the intercondylar notch simplifies the examination compared to using the trochlear groove alone. A feasibility study conducted for this paper indicates that this second guideline value is an adequate replacement for the conventional measurement of the TT-TG. Especially in case of trochlea dysplasia the detection and definition of the groove may be difficult and the TT-IN value offers a reasonable alternative. Our study shows that the proposed sonography system is able to accurately determine the TT-TG in a population of symptom-free young subjects. These measurements range from 13.1 ± 4.2 mm for male to 14.8 ± 3.4 mm for female subjects. Our findings correspond to the postulated values of the gold standard. We are able to show that the values for the TT-IN are in a comparable range with 14.4 ± 4.1mm for men and 13.6 ± 4.0 mm for women. We are convinced that this study strongly indicates that the TT-IN is a useful value that is easy to measure with a mobile ultrasound-based measurement system and can provide the same level of diagnostic value compared to the gold standard TT-TG. In conclusion, a new guideline value is presented to complement the measurement of the TT-TG when a pathological anatomy prevents the detection of the groove.
Źródło:
Medical Robotics Reports; 2018, 7; 26--30
2299-7407
Pojawia się w:
Medical Robotics Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Formation and Characterization of Nanostructured Composite Coatings Based on the TiN Phase
Autorzy:
Komarov, F.
Konstantinov, S.
Pogrebnjak, A.
Pilko, V.
Kozak, C.
Opielak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1198880.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Nq
Opis:
Nanostructured thin-film coatings based on titanium nitride, doped with silicon, chromium and aluminium were the object of this study. The creation of a smooth transition layer was carried out by the changing of a supplying nitrogen flow to the vacuum chamber during the application. TiSiN, TiCrN and TiAlN coatings were deposited. The studies of the structure, elemental and phase composition of the coatings were carried out. Also, the performance of coatings was investigated. The results can be used in today's technology, such as mechanical engineering.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1292-1295
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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