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Electromagnetic Wav.s Absorbing Characteristics of Composite Material Containing Carbonyl Iron Particles

Materials Sciences and Applications 2014年第11期5卷 803-811页

作者： v.ctor A. Zhurav.ev.v.lentin I. Suslyaev.Ev.eny Yu. Korov.n kyrill v. dorozhkin Department of Radioelectronics National Research Tomsk State University Tomsk Russia

Results of measurements of permeability, permittiv.ty and radar absorption properties of composites on basis of carbonyl iron particles R-10 brand are presented in this paper. The calculations and experimental studies hav. shown that in the super high frequency (SHF) and extremely high frequency (EHF) ranges on the basis of two-layer structures with different content of carbonyl iron particles can create a radar absorbing coatings with a reflectiv.ty of less than -10 dB ov.r a wide bandwidth from 3.1 to 17.1 GHz and from 27 to 37 GHz. Absorbing properties of composites are sav.d in terahertz frequency range from 250 to 525 GHz.

关键词： Electromagnetic Wav. Absorbers Radar Absorbing Materials and Coatings Composite Materials Carbonyl Iron Powders Spectrum of Permittiv.ty and Permeability

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Nitroxy-and azidomethyl azofurazans as adv.nced energetic materials

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Defence Technology（防务技术） 2022年第8期18卷 1369-1381页

作者： Aleksei B.Sheremetev.Sv.tlana F.Mel'nikov. Elizav.ta S.Kokarev. Ruslan E.Nekrutenko Kirill v.Strizhenko kyrill Yu Suponitsky Thanh Dat Pham Alla N.Piv.ina v.lery P.Sinditskii Zelinsky Institute of Organic Chemistry Russian Academy of Sciences47 Leninsky ProspMoscow119991Russia Saint Petersburg State Institute of Technology 26 Moskovskii PrSt Petersburg190013Russia Mendeleev.Univ.rsity of Chemical Technology Moscow125047Russia N.N.Semenov.Federal Research Center for Chemical Physics Russian Academy of Sciences4 Kosygina Str119991MoscowRussia

Progress in the rocket industry is only possible on the basis of new, higher performance and more env.ronmentally friendly materials compared to up-to-date propellant ingredients for liquid, solid, gelled and hybrid propellant systems. In this work, synthetic methods hav. been dev.loped for the preparation of new energetic azofurazans bearing nitroxymethyl or azidomethyl groups. All prepared compounds were fully characterized by multinuclear NMR and IR spectroscopies, as well as elemental analyses. An analysis of the structural features based on the X-ray single-crystal diffraction made it possible to discuss their influence on the densities of the azofurazans of this study. Thermal decomposition and combustion of nitroxymethyl and azidomethyl azofurazans were studied using a number of complementary experimental techniques, namely thermograv.metry, differential scanning calorimetry, manometry, microthermocouple measurements in the combustion wav.. The structural and physical characteristics of these new energetic analogues illustrate the extent to which the nature of the explosophoric groups can be used to tune the performace of the azofurazan framework. These azofurazans possess positiv. calculated enthalpy of formation and are promising candidates for new env.ronmentally friendly energetic materials.

关键词： Azofurazan Azide Nitrate ester X-ray Combustion

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Dissolution mechanism of calcium apatites in acids:A rev.ew of literature

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World Journal of Methodology 2012年第1期2卷 1-17页

作者： Sergey v.dorozhkin Kudrinskaja sq.1-155 Moscow 123242Russia

Eight dissolution models of calcium apatites(both fluorapatite and hydroxyapatite) in acids were drawn from the published literature,analyzed and *** limitations and drawbacks of the models were conv.rsed in *** models were shown to deal with different aspects of apatite dissolution phenomenon and none of them was able to describe the dissolution process in ***,an attempt to combine the findings obtained by different researchers was performed which resulted in creation of the general description of apatite dissolution in *** this purpose,eight dissolution models were assumed to complement each other and prov.de the correct description of the specific aspects of apatite *** general description considers all possible dissolution stages inv.lv.d and points out to some missing and unclear phenomena to be experimentally studied and v.rified in *** creates a new methodological approach to inv.stigate reaction mechanisms based on sets of affine data,obtained by v.rious research groups under dissimilar experimental conditions.

关键词： Dissolution mechanism literature calcium apatites models

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