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Valentin N. Sapunov,Antonina A. Stepacheva,Esther M. Sulman,Johan Wärnåc,Päivi Mäki-Arvela,Mikhail G. Sulman,Alexander I. Sidorov,Barry D. Stein,Dmitry Yu. Murzin,Valentina G. Matveeva 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Stearic acid hydrodeoxygenation into n-heptadecane on the catalyst containing Pd nanoparticlesincorporated in the hypercrosslinked polystyrene matrix was studied. The used catalysts werecharacterized using TEM, CO chemisorption, low-temperature nitrogen physisorption and XPS. A clearhydrogen pressure dependent induction period was noticed. Kinetic regularities were studied for theindicated reaction in the presence of polymer based catalysts. A mathematical model for decarboxylationwas suggested which was able to adequately describe experimental data at different temperatures,hydrogen pressures and initial concentrations of stearic acid. Kinetic constants were calculated and theirstatistical analysis was performed.
Lee, Jae Ah,Shin, Min Kyoon,Kim, Shi Hyeong,Kim, Seon Jeong,Spinks, Geoffrey M.,Wallace, Gordon G.,Ovalle-Robles, Raquel,Lima, Má,rcio D.,Kozlov, Mikhail E.,Baughman, Ray H. American Chemical Society 2012 ACS NANO Vol.6 No.1
<P>We report mechanically robust, electrically conductive, free-standing, and transparent hybrid nanomembranes made of densified carbon nanotube sheets that were coated with poly(3,4-ethylenedioxythiophene) using vapor phase polymerization and their performance as supercapacitors. The hybrid nanomembranes with thickness of ∼66 nm and low areal density of ∼15 μg/cm<SUP>2</SUP>exhibited high mechanical strength and modulus of 135 MPa and 12.6 GPa, respectively. They also had remarkable shape recovery ability in liquid and at the liquid/air interface unlike previous carbon nanotube sheets. The hybrid nanomembrane attached on a current collector had volumetric capacitance of ∼40 F/cm<SUP>3</SUP> at 100 V s<SUP>–1</SUP> (∼40 and ∼80 times larger than that of onion-like carbon measured at 100 V s<SUP>–1</SUP> and activated carbon measured at 20 V s<SUP>–1</SUP>, respectively), and it showed rectangular shapes of cyclic voltammograms up to ∼5 V s<SUP>–1</SUP>. High mechanical strength and flexibility of the hybrid nanomembrane enabled twisting it into microsupercapacitor yarns with diameters of ∼30 μm. The yarn supercapacitor showed stable cycling performance without a metal current collector, and its capacitance decrease was only ∼6% after 5000 cycles. Volumetric energy and power density of the hybrid nanomembrane was ∼70 mWh cm<SUP>–3</SUP> and ∼7910 W cm<SUP>–3</SUP>, and the yarn possessed the energy and power density of ∼47 mWh cm<SUP>–3</SUP> and ∼538 W cm<SUP>–3</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2012/ancac3.2012.6.issue-1/nn203640a/production/images/medium/nn-2011-03640a_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn203640a'>ACS Electronic Supporting Info</A></P>
Mikhail M., Krasnov,Marina E., Ladonkina,Olga A., Nekliudova,Vladimir F., Tishkin Techno-Press 2022 Advances in aircraft and spacecraft science Vol.9 No.5
This study compares various ways of calculating flows for the problems with the presence of shock waves by first-order schemes and higher-order DG method on the tests from the Quirk list, namely: Quirk's problem and its modifications, shock wave diffraction at a 90 degree corner, the problem of double Mach reflection. It is shown that the use of HLLC and Godunov's numerical schemes flows in calculations can lead to instability, the Rusanov-Lax-Friedrichs scheme flow can lead to high dissipation of the solution. The most universal in heavy production calculations are hybrid schemes flows, which allow the suppression of the development of instability and conserve the accuracy of the method.
Mikhail M., Krasnov,Marina E., Ladonkina,Olga A., Nekliudova,Vladimir F., Tishkin Techno-Press 2022 Advances in aircraft and spacecraft science Vol.9 No.5
This study compares various ways of calculating flows for the problems with the presence of shock waves by first-order schemes and higher-order DG method on the tests from the Quirk list, namely: Quirk's problem and its modifications, shock wave diffraction at a 90 degree corner, the problem of double Mach reflection. It is shown that the use of HLLC and Godunov's numerical schemes flows in calculations can lead to instability, the Rusanov-Lax-Friedrichs scheme flow can lead to high dissipation of the solution. The most universal in heavy production calculations are hybrid schemes flows, which allow the suppression of the development of instability and conserve the accuracy of the method.
Palatnikov Mikhail N.,Shcherbina Olga B.,Masloboeva Sofja M.,Smirnov Maxim V.,Sidorova Olga V.,Kadetova Alexandra V.,Zelenina Elena V.,Efremov Vadim V.,Fedorinova Yulia P. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.4
In the work, a fine powder of GdNb0.9Ta0.1O4-mixed gadolinium tantalum niobate activated with rare earth (REE) cations (Sm3+, Eu3+, Tb3+ and Er3+) was obtained by sol–gel synthesis. The evolution of the powder from amorphous to crystalline form was also studied in the work. The evolution was studied by synchronous thermal and X-ray analysis. The phase composition and structure of the resulting Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 powders were analyzed in detail. Ceramic samples of the Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 polycomponent solid solution were prepared from the sol–gel synthesized powder using traditional ceramic technology. The phase composition and characteristics of the structure of individual phases of the Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramic solid solution was determined by full-profile analysis of XRD patterns of polycrystals. We established that incorporation of REE (Tb, Er, Eu, Sm) into the gadolinium site in GdNb0.9Ta0.1O4 solid solution leads to various distortions of the corresponding polyhedra. Note that the distortion degree in this case is much greater than the distortion of the initial GdNbO4 structure. The photoluminescent (PL) properties of the Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 solid solution were studied in the visible wavelength range. Analysis of literature and our own data revealed: electronic relaxation pathways in Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramics can be different depending on the energy of the exciting radiation. Excitation by the 376 nm line leads to internal energy conversion over 4fn–4fn levels of REE cations (Sm3+, Eu3+, Tb3+ and Er3+). The energy transfer between the Nb4+–O−–Ta4+–O− groups and REE is maximal in this case, while the radiation of the matrix from Nb4+–O−–Ta4+–O− emission centers is minimal. Upon excitation in the near-UV range (376 nm), Gd3+ cations do not participate in the energy transfer between the matrix and 4fn–4fn levels of REE dopants. The maximum PL of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramics is observed in the green–red region of the spectrum from 5D0–7F2 and 4G5/2–6H7/2 transitions of Eu3+ and Sm3+. The emission is maximal at ~ 612 nm; it corresponds to the 5D0–7F2 electric dipole transition of the Eu3+ cation. We established that the efficiency of energy transfer between the matrix and doping REE cations for Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramics strongly depends on the energy of the exciting radiation.
VLADIMIR M. MASALOV,ELENA A. KUDRENKO,NATALIA A. GRIGORYEVA,KSENIA V. EZDAKOVA,VLADIMIR V. RODDATIS,NADEZHDA S. SUKHININA,MIKHAIL V. AREFEV,ALEXANDER A. MISTONOV,SERGEI V. GRIGORIEV,GENNADI A. EMELCHE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.4
Ultramicrotomy was used to prepare a cross-section of shell-like amorphous SiO2 spherical particle synthesized by the multistage Stöber method which allowed performing first direct observations of the hierarchical structure of the SiO2 particle by transmission and scanning electron microscopy. The presence of primary, secondary and tertiary particles forming the inner structure of SiO2 spheres was established. The use of the small angle scattering of neutrons and synchrotron radiation techniques has enabled to define the size of the primary particles, the fractal parameters of their surface and the bulk density of the SiO2 spheres.