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    Wyświetlanie 1-13 z 13
    Tytuł:
    Thermochemical and Performance Properties of NO2-Substituted Borazines as New Energetic Compounds with High Thermodynamic Stability
    Autorzy:
    Zamani, M.
    Keshavarz, M. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/951505.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    electrostatic potential
    enthalpy sublimation
    enthalpy formation
    density
    Opis:
    The structural isomers of nitroborazines were optimized at M062X/6-311++G** level of theory. The effects of the NO2 group on the molecular volume, molecular surface area, crystal density, positive, negative and total average potentials, variances, average deviation and electrostatic balance parameter on the molecular surface were considered. In addition, some important thermodynamic properties of these compounds, such as gas phase and condensed phase enthalpies of formation (ΔfH° (g) and ΔfH° (c)), and the enthalpy of sublimation (ΔH° sub), were calculated. It was found that the crystal densities (ρ) are in the range 1.4471.902 g/cm3. These values are slightly smaller than the corresponding values of their carbon analogues (except for the mononitro compounds). Meanwhile, the values of ρ for B-substituted, di- and trinitroborazines are larger than the related N-substituted compounds. The calculated values of ΔH° sub are in the range 20.1-30.4 kcal/mol. The calculated values of ΔfH° (g) and ΔfH° (c) for the B-substituted nitroborazines are more negative than those for the N-substituted ones. The stability sequence of the hydrogen bonded network structures of nitroborazines in the condensed phase is: dinitroborazine > mononitroborazine > trinitroborazine. The detonation pressure and velocity of these compounds were also calculated. Nitroborazines can be introduced as energetic compounds with high thermodynamic stability and relatively low detonation performance.
    Źródło:
    Central European Journal of Energetic Materials; 2014, 11, 3; 363-381
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Relationship Between the Heats of Formation and the Molecular Electrostatic Potentials of Polyazaarenes
    Autorzy:
    Bartošková, M.
    Friedl, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/358483.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    high-nitrogen compounds
    azines
    azoles
    heat of formation
    molecular surface electrostatic potential
    Opis:
    In order to characterize the explosive properties of high-nitrogen, energetic compounds, the heats of formation, either in the gas or the solid state, are often used as preliminary data. Their relationship to the number of nitrogen atoms involved is usually known, so exploring it cannot furnish any new information. However, the very promising, quantitative structure property relationship (QSPR) approach utilizes the molecular surface electrostatic potential V(r). We have therefore performed calculations for 12 azines and 10 azoles by the DFT B3PW91/cc-pVTZ method, and constructed their gas phase heats of formation Δf H°(298,g) by means of the isodesmic reaction approach. The acquired gas phase heats of formation Δf H°(298,g) were correlated with the molecular surface electrostatic potentials VS,max, VS,min, and VS(ring), which were calculated by the B3LYP/6-31G(d,p)//B3PW91/cc-pVTZ method. It is shown that the VS(ring) electrostatic potential describes very precisely the structures of high-nitrogen N-heteroaromatics, with both consecutive and isolated nitrogen atoms, and their thermodynamic properties.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 1; 103-112
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Density Prediction, Charge Density Distribution and the Explosive Properties of the Highly Energetic Molecule 2-Methyl-5-nitramino-tetrazole: a DFT and AIM Study
    Autorzy:
    Srinivasan, P.
    Kumaradhas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/358115.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    crystal density
    electron density
    Laplacian of electron density
    impact sensitivity
    electrostatic potential
    Opis:
    The ab initio crystal density, bond topological and explosive properties of the energetic molecule 2-methyl-5-nitraminotetrazole (MNAT) have been calculated by the MOLPAK/PMIN software and the AIM theory. The density predicted from the crystal structure simulation almost matches the experimental density. The geometrical parameters of the molecule lifted from the crystal structure are in very close agreement with the reported X-ray molecular structure. The bond topological analysis predicts a signifcantly low bond electron density, as well as a less Laplacian of electron density, for the N–NO2 bond. The Laplacian for the bond to the attached methyl group, the C(2)–N(2) bond, is also found to be less negative; the less negative values of the Laplacian confrms that these are the weakest bonds in the molecule. The impact sensitivity (h50) of the molecule has been calculated, and is almost equal to the reported experimental value. The sensitivity of the molecule was also estimated from the electrostatic imbalance parameter and has the value ν = 0.242. The isosurface of the electrostatic potential of the molecule displays a high negative electrostatic potential region around the tetrazole ring and the nitramine N–N bond, which are the possible reactive locations in the molecule.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 1; 53-68
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charge Density Distribution, Electrostatic Properties and Sensitivity of the Highly Energetic Molecule 2,4,6-Trinitro-1,3,5-triazine: A Theoretical Study
    Autorzy:
    Srinivasan, P.
    Maheshwari, K.
    Jothi, M.
    Kumaradhas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/358320.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic molecule
    electron density
    Laplacian of electron density
    electrostatic potential
    impact sensitivity
    Opis:
    Ab initio and density functional theory (DFT) calculations were carried out on the energetic propellant molecule 2,4,6-trinitro-1,3,5-triazine (TNTA) to understand its bond topology and its energetic properties using the theory of atoms in molecules (AIM). The DFT method predicts that the electron density ρ bcp (r) at the bond critical points of ring C-N bonds is ∼ 2.34 e Å -3 and the corresponding Laplacian ∇ 2 ρ bcp(r) is ∼ -24.4 e Å -5 ; whereas these values are found to be very small in the -NO2 group attached to C-N bonds [ρ bcp(r): ∼ 1.73 e Å -3 and Δ 2 ρ bcp (r): ∼ -14.5 e Å -5 ]. The negative Laplacian values of C-NO 2 bonds are significantly lower which indicates that the charges of these bonds are highly depleted. The C-NO2 bonds exhibit low bond order (∼ 0.8), as well as low (∼ 56.4 kcal/mol) bond dissociation energy. As we reported in our earlier studies, we found high bond charge depletion for these bonds, which are considered the weakest bonds in the molecule. The frontier orbital energies exhibit a wide band gap, which is larger than those of existing molecules TATB, TNT and TNB. The impact sensitivity (H 50 %) (4.2 m) and oxygen balance (2.77%) were calculated and compared with related structures. Large negative electrostatic potential regions were found near the nitro groups where reaction is expected to occur. The relation between charge depletion ∇ 2 ρ bcp(r) and the electrostatic potential at the bond midpoints V mid reveals the sensitive areas of the molecule.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 1; 59-76
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal Structure Prediction and Charge Density Distribution of Highly Energetic Dimethylnitraminotetrazole: a First Step for the Design of High Energy Density Materials
    Autorzy:
    Arputharaj, D. S.
    Srinivasan, P.
    Asthana, S. N.
    Pawar, R. B.
    Kumaradhas, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/358205.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic materials
    crystal structure prediction
    charge density analysis
    atoms in molecules
    electrostatic potential
    Opis:
    The crystal structure of dimethylnitraminotetrazole has been predicted, based on systematically searching for densely packed structures within common organic crystal coordination types, followed by lattice energy minimization. The predicted crystal structures almost match the reported crystal structure determined by X-ray diffraction analysis. To understand the effect of the initial molecular geometry on the crystal packing, the crystal structure simulation was carried out for molecules taken from different environments, such as the X-ray structure (crystal field) and also from ab initiocalculations (gas phase). The predicted crystal structures from both environments are very similar to the reported X-ray structure with a maximum deviation of 4.5%. The crystal density predicted from both methods is close to that reported. The bond topological, energetic and electrostatic properties of the isolated molecule from the predicted crystal structure have been determined using Bader's theory of atoms in molecules. The bond topological characterization reveals that the C-N bond is the weakest bond in the molecule. A large electronegative potential is found in the vicinity of the NO2group and the nitrogen-rich region of the tetrazole ring; these are probably the reactive sites of this molecule.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 3; 201-217
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular models in chemistry education at university and upper secondary school - structure of amides
    Modele molekularne w nauczaniu chemii w szkole średniej i wyższej - struktura amidów
    Autorzy:
    Kolář, Karel
    Doležal, Rafael
    Karásková, Natálie
    Maltsevskaya, Nadezhda V.
    Křížková, Šárka
    Powiązania:
    https://bibliotekanauki.pl/articles/106668.pdf
    Data publikacji:
    2019
    Wydawca:
    Towarzystwo Chemii i Inżynierii Ekologicznej
    Tematy:
    acidity
    amides
    basicity
    electrostatic potential
    molecular models
    kwasowość
    amidy
    zasadowość
    potencjał elektrostatyczny
    modele molekularne
    Opis:
    Molecular models derived from results of quantum-chemical calculations present an important category of didactic instruments in chemistry education in upper secondary school and, particularly, at university. These models can be used especially as tools for supporting the students’ understanding by visual learning, which can adequately address complexity of many chemical topics, incorporate appropriate didactic principles, as well as utilize the benefits brought up by the actual information technology. The proposed molecular models are non-trivial examples of didactic application of computational chemistry techniques in illustration of electron interactions in amidic group, namely the interaction of the free electron pair on the nitrogen atom with the carbonyl group and also the interaction of atoms in the amide group with other surrounding atoms in the molecule. By these molecular models it is possible to explain acid-base properties of amides applying knowledge of electron density distribution in the molecules and the resulting electrostatic potential. Presentation of the structure and properties of the amides within education is important also for the reason that amidic functions are involved in many important natural substances (e.g. proteins, peptides, nucleic acids or alkaloids), synthetic macromolecular substances (e.g. Silon) or pharmaceutical preparations (e.g. paracetamol). Molecular models then serve to support better understanding of the structure of these substances and, in relation to it, their properties.
    Źródło:
    Chemistry-Didactics-Ecology-Metrology; 2019, 24, 1-2; 45-51
    2084-4506
    Pojawia się w:
    Chemistry-Didactics-Ecology-Metrology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrostatics in computer-aided drug design
    Autorzy:
    Naray-Szabo, G.
    Matyus, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953955.pdf
    Data publikacji:
    1998
    Wydawca:
    Politechnika Gdańska
    Tematy:
    electrostatics
    drug design
    molecular electrostatic potential
    molecular electrostatic field
    similarity
    pharmacophore
    ComFa method
    protein-ligand interaction
    Opis:
    Hydrogen bonds and charge-charge interactions, determined by molecular electrostatics, play essential role in biopolymer-ligand associations. Accordingly, electrostatics is crucial in the qualitative and quantitative characterisation of the binding of drugs to their target molecules. In the following, we will give an account on the role of molecular electrostatics in a drug design, laying emphasis on our own work. We will survey the most important computation methods of molecular electrostatic potentials, then outline basic aspects of molecular recognition: steric, electrostatic and hydrophobic complementarity. On the basis of the complementarity, we will also define molecular similarity and discuss various applications of these concepts to the treatment of protein-ligand interactions and a rational drug design. Special attention will be paid to a receptor mapping and to a comparative molecular field analysis, with some our recent applications. A further important point will be the molecular electrostatic field (potential gradient) as a hydrophobicity measure. We will argue that the hydrophobic complementarity and similarity can be treated on the basis of matching regions of the interacting molecules that are characterised by a similar magnitude of the electrostatic field. The concept of the electrostatic complementarity will be extended to enzyme-substrate interactions, providing a firm basis for the quantitative estimation of catalytic rate enhancement.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 4; 551-562
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mixed type boundary-value problem related to the electrostatics of cold plasma jet reactors based on dielectric barrier discharge
    Autorzy:
    Vafeas, Panayiotis
    Papadopoulos, Polycarpos K.
    Svarnas, Panagiotis
    Powiązania:
    https://bibliotekanauki.pl/articles/1838214.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    DBD
    dielectric barrier discharge
    cold plasma jet
    reactor
    mixed type boundary value problem
    electrostatic potential theory
    Opis:
    A semi-analytical model is presented for the determination of the electric field in reactors used for cold atmospheric pressure plasma (CAPP) jet production, based on the concept of dielectric barrier discharge (DBD). These systems are associated with various applications in contemporary engineering, ranging from material processing to biomedicine, and at the same time they provide many challenges for fundamental research. Here, we consider a simplified system configuration of a single driven electrode, surrounding a thin dielectric tube, which does not contribute to the electric field, since the potential variation is immediate due to its negligible size. By employing the cylindrical coordinate system that perfectly fits the present plasma jet reactor, we separate the area of electric activity into three distinct domains according to the imposed external conditions, while our analysis is restricted to the electrostatic limit of Maxwell’s equations. To this end, cylindrical harmonic field expansions are used for the potential, which produce the corresponding electric fields in each subdomain. Due to the imposed mixed-type boundary value problem, additional linear terms are incorporated, leading to three possible analytical solutions of the physical problem under consideration. The efficiency of the method is demonstrated by comparing the final formulae with a numerical solution, followed by the relevant discussion.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2021, 31, 2; 233-245
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical investigations into the Spectrophotometrically Analyzed Niobium (V)-6-Chloro-3-hydroxy-7-methyl-2-(2’-thienyl)-4H-chromen-4-one Complex
    Autorzy:
    Dhonchak, Chetna
    Agnihotri, Nivedita
    Azam, Mohammad
    Javed, Saleem
    Muthu, Sambantham
    Al-Resayes, Saud I.
    Min, Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/27315655.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Niobium
    6-Chloro-3-hydroxy-7-methyl-2-(2’-thienyl)-4H-chromen-4-one
    spectrophotometry
    DFT
    density functional theory
    MEP
    molecular electrostatic potential
    Opis:
    Pentavalent niobium cation forms a stable yellow-colored binary complex with 6-chloro-3-hydroxy-7-methyl-2-(2’- thienyl)-4H-chromen-4-one (CHMTC) in the ratio of 1:2. The complex is quantitatively extractable into carbon tetrachloride from HClO4 solution maintained at pH 1.26–1.75 and strictly adheres to Beer’s law as verified by the Ringbom plot with an optimized range of determination as 0.385–1.211 ppm of Nb(V). The ligand-metal complex system shows good precision, accuracy, sensitivity, and selectivity and handles satisfactorily the analysis of several samples of varying complexity. The results are highly reproducible as confirmed by statistical data. The stability of the complex is theoretically confirmed with the help of HOMO-LUMO values and the energy gap [for CHMTC, ΔEgap = 3.62 V and for Nb(V)-CHMTC Complex, ΔEgap = 2.97 eV]. The reactivity descriptors were calculated for detailed computational study to probe into the chemical behavior of the studied ligand and its complex. Further, mapped electrostatic potential diagrams help in justifying the donor sites of CHMTC ligand which is in accordance with the analytical findings.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 3; 63--70
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Borowce jako centra kwasów Lewisa w oddziaływaniach międzycząsteczkowych : porównanie z wiązaniami wodorowymi
    Triels as centers of Lewis acids in intermolecular interactions : comparison with hydrogen bonds
    Autorzy:
    Grabowski, S. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/172397.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    wiązanie wodorowe
    wiązanie borowcowe
    potencjał elektrostatyczny
    dziura σ
    dziura π
    przesunięcie ładunku elektronowego
    struktury krystaliczne
    hydrogen bond
    triel bond
    electrostatic potential
    σ-hole
    π-hole
    electron charge shift
    crystal structures
    Opis:
    The triel bonds are analyzed and compared with the hydrogen bond interaction. The triel bonds belong to the class of interactions that are named as the σ-hole and π-hole bonds. The σ-hole bond is an interaction between the σ-hole characterized by the positive electrostatic potential and the electron rich regions such as lone electron pairs, π-electron systems, in other words, centers paying a role of Lewis bases. The σ-holes may be observed for elements of the 14–18 groups of the periodic system and the corresponding interactions with Lewis bases are named; tetrel, pnicogen, chalcogen, halogen and aerogen bonds, respectively. On the other hand, π-holes also characterized by the positive electrostatic potential are observed for centers in planar molecules or planar fragments of molecules in regions above those planes. π-holes may be attributed to triel centers (13th group of the periodic system). The boron and aluminium trihydrides and trihalides are examples of molecules where triels are characterized by π-holes. The mechanism of the triel bond formation is very similar to the mechanism of the formation of the hydrogen bond. It is the Lewis acid – Lewis base interaction where the electron charge transfer from the base unit to the acid one is observed. Next there is outflow of the electron charge from the triel center to the other parts of the Lewis acid unit; in other words the positive charge of the triel center increases as a result of complexation. The triel bonds are often very strong and often they possess characteristics of typical covalent bonds; this is confirmed by the QTAIM (Quantum Theory of Atoms in Molecules) and NBO (Natural Bond Orbital) approaches. For example, for the triel bonds the bond paths between the triel center and the Lewis base center are observed with the bond critical points (BCPs) attributed to those paths. Similarly for the A-H…B hydrogen bonds the H…B bond paths are observed. The parameters of those BCPs often indicate the covalent character of the triel bonds and analogously those characteristics for H-bonds may also indicate the covalent character of the latter interactions. It is very interesting that the triel bonds are observed experimentally in the real systems; for example in crystal structures. The triel center which is trivalent and possesses the trigonal configuration is hypovalent; it means that the octet rule is not obeyed here because of the valence electrons´ deficiency (the triel center possesses six valence electrons in such species). Thus it may interact with one Lewis base ligand reaching rather stable octet and tetrahedral configuration. If the trivalent triel center interacts with two Lewis base ligands thus it may lead to the configuration of the trigonal bipyramid with the hypervalent and pentavalent triel center. These kinds of the triel species occur in crystal structures that are described here.
    Źródło:
    Wiadomości Chemiczne; 2017, 71, 7-8; 447-471
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of potential level, rotation speed and electrode gap on food waste recovery using an electrostatic separator
    Autorzy:
    Lai, K.
    Lim, S.
    Teh, P.
    Yeap, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/207335.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    electrostatic separator
    bioethanol
    waste segregation
    separator elektrostatyczny
    segregowanie odpadów
    bioetanol
    Opis:
    An environmentally friendly method to segregate FW from waste mixture has been presented. The potential level of the separator, the rotation speed and electrode gap are chosen as the independent experimental factors. Second-order quadratic equations have been elaborated to correlate the interactive relationship between the experimental factors and the separation efficiency. The results of the statistical analysis indicate that the electrode gap has immense influence on FW separation. The optimal conditions of segregation have been determined as follows: potential level of 30 kV, rotation speed of 60 rpm, electrode gap of 54 mm and a maximal separation efficiency of 84.0%.
    Źródło:
    Environment Protection Engineering; 2017, 43, 2; 81-92
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified ceramic porous materials intended for retention viruses imitating particles from water
    Modyfikowane ceramiczne tworzywa porowate przeznaczone do usuwania z wody cząstek imitujących wirusy
    Autorzy:
    Zalewska, M.
    Szafran, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355554.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc oxide
    zeta potential
    electrostatic adsorption
    water purification
    tlenek cynku
    potencjał zeta
    adsorpcja elektrostatyczna
    oczyszczanie wody
    Opis:
    The main purpose of this study was to perform ceramic composite materials with active filter layers which could be applied in the process of elimination viruses imitating particles from water. In this study, the method of obtaining the active layer on the surface of the ceramic porous materials was developed and simulation of the filtration process using polymer dispersion characterized by similar size of particles to the size of viruses and negative charge at the pH of drinking water as it is in the case of viruses was carried out. In order to obtain ceramic composite materials, two types of zinc oxide were used. Application of ZnO is also beneficial because of their low toxicity to human and antibacterial properties.
    Głównym celem badań było wykonanie ceramicznych tworzyw porowatych z aktywną warstwą filtracyjną, które mogłyby skutecznie usuwać z wody cząstki imitujące wirusy. Opracowano metodę otrzymywania aktywnej warstwy na powierzchni tworzywa ceramicznego oraz przeprowadzono symulację procesu filtracji. Zastosowano dyspersję polimerową odznaczającą się wielkością cząstek zbliżoną do wielkości wirusów oraz mającą ładunek ujemny w zakresie pH wody pitnej podobnie jak to jest w przypadku wirusów. W badaniach zastosowano dwa rodzaje proszków tlenku cynku. Zastosowanie ZnO jest korzystne ze względu na ich niską toksyczność oraz właściwości antybakteryjne.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 4; 1287-1289
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozwój metod badawczych związanych z Dyrektywą ATEX w Laboratorium Badań Stosowanych
    Development of testing methods associated with ATEX Directive in the Laboratory of Applied Tests
    Autorzy:
    Kamiński, T.
    Lesiak, K.
    Orzech, Ł.
    Talarek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/198920.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniki Górniczej KOMAG
    Tematy:
    zaplecze naukowo-badawcze
    ATEX
    wyładowanie elektrostatyczne
    potencjał powierzchniowy
    osłona ognioszczelna
    testing infrastructure
    electrostatic discharge
    surface potential
    fire-proof shields
    Opis:
    W artykule przedstawiono nowe metody badawcze związane z Dyrektywą ATEX wdrożone do stosowania w Laboratorium Badań Stosowanych. Przedstawiono możliwości badawcze nowo zakupionego wyposażenia i stanowisk badawczych. Zaprezentowano wyniki badań rozkładu potencjału powierzchniowego po wystąpieniu wyładowania z powierzchni materiałów nieprzewodzących. Zaprezentowano przebieg wybuchu mieszaniny metanowo-powietrznej podczas badań małych elementów. Opisano stanowisko do badań osłon ognioszczelnych „d” i zaprezentowano zarejestrowany przebieg zmian ciśnienia podczas wybuchu podstawowych mieszanin gazowych stosowanych w badaniach.
    New testing methods associated with ATEX Directive implemented in the Laboratory of Applied Tests are presented. Testing potential of newly purchased equipment and tests stands is given. The results of testing the distribution of surface potential after discharge from non-conducting materials are presented. Process of explosion of methane-air mixture during testing of small components is given. Stand for testing the “d” fireproof shields is described and the recorded curve of pressure changes during explosion of tested main flammable gases is shown.
    Źródło:
    Maszyny Górnicze; 2014, 32, 1; 29-35
    0209-3693
    2450-9442
    Pojawia się w:
    Maszyny Górnicze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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