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Showing 1 to 12 of 17 entries
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Copper Affects the Location of Zinc in Bimetallic Ion-Exchanged Mordenite.

Chemphyschem : a European journal of chemical physics and physical chemistry

Reule AAC, Shen J, Semagina N.
PMID: 29575723
Chemphyschem. 2018 Jun 19;19(12):1500-1506. doi: 10.1002/cphc.201800021. Epub 2018 Apr 19.

Bimetallic ion exchange on a zeolite often impacts its catalytic properties compared to its monometallic counterparts. Here, we address the synergistic effect of simultaneous copper and zinc ion exchange on mordenite (MOR), as found earlier for dimethyl ether (DME)...

[Classification of liver cirrhoses].

Terapevticheskii arkhiv

Ryss SM, Smagin VG.
PMID: 5999171
Ter Arkh. 1966 Oct;38(10):105-12.

No abstract available.

Generation of broadband surface acoustic waves using a dual temporal-spatial chirp method.

The Journal of the Acoustical Society of America

Fall D, Duquennoy M, Ouaftouh M, Smagin N, Piwakowski B, Jenot F.
PMID: 28764437
J Acoust Soc Am. 2017 Jul;142(1):EL108. doi: 10.1121/1.4994676.

Wideband surface acoustic wave (SAW) generation with a spatial chirp-based interdigital transducer was optimized for non-destructive characterization and testing of coatings and thin layers. The use of impulse temporal excitation (Dirac-type negative pulse) leads to a wide band emitter...

Non-destructive characterization of surfaces and thin coatings using a large-bandwidth interdigital transducer.

The Review of scientific instruments

Fall D, Duquennoy M, Ouaftouh M, Smagin N, Piwakowski B, Jenot F.
PMID: 30599617
Rev Sci Instrum. 2018 Dec;89(12):124901. doi: 10.1063/1.5045213.

This paper deals with non-destructive testing of thin layer structures using Rayleigh-type waves over a broad frequency range (25-125 MHz). The dispersion phenomenon was used to characterize a layer-on-substrate-type sample comprising a thin layer of platinum 100 nm thick...

Local damage detection by nonlinear coda wave interferometry combined with time reversal.

Ultrasonics

Smagin N, Trifonov A, Bou Matar O, Aleshin VV.
PMID: 32702555
Ultrasonics. 2020 Dec;108:106226. doi: 10.1016/j.ultras.2020.106226. Epub 2020 Jul 15.

Coda wave interferometry (CWI) is a sensitive ultrasound method for the detection of weak and local changes in complex inhomogeneous media. In a nonlinear modification of the method discussed here, a high-frequency probe coda is compared to its replica...

Efficient Photooxidation of Aryl(hetaryl)pyrazolines by Benzoquinone.

Photochemistry and photobiology

Traven VF, Ivanov IV, Dolotov SM, Semakin AN, Cheptsov DA, Mamirgova ZZ.
PMID: 30613996
Photochem Photobiol. 2019 Jul;95(4):924-930. doi: 10.1111/php.13082. Epub 2019 Feb 25.

Photooxidation of aryl(hetaryl)pyrazolines in the presence of benzoquinone has been studied in organic solvents. This reaction occurs at high rate to provide the corresponding pyrazole in a good yield. The effects of the solvent, pyrazoline structure and oxygen provide...

Construction of bis-, tris- and tetrahydrazones by addition of azoalkenes to amines and ammonia.

Beilstein journal of organic chemistry

Semakin AN, Kokuev AO, Nelyubina YV, Sukhorukov AY, Zhmurov PA, Ioffe SL, Tartakovsky VA.
PMID: 28144315
Beilstein J Org Chem. 2016 Nov 21;12:2471-2477. doi: 10.3762/bjoc.12.241. eCollection 2016.

Exhaustive Michael-type alkylations of amines and ammonia with azoalkenes (generated from α-halohydrazones) were demonstrated as an efficient approach to poly(hydrazonomethyl)amines - a novel class of polynitrogen ligands. An intramolecular cyclotrimerization of C=N bonds in tris(hydrazonomethyl)amine to the respective 1,4,6,10-tetraazaadamantane...

Platinum Inhibits Low-Temperature Dry Lean Methane Combustion through Palladium Reduction in Pd-Pt/Al.

Chemphyschem : a European journal of chemical physics and physical chemistry

Nassiri H, Lee KE, Hu Y, Hayes RE, Scott RW, Semagina N.
PMID: 27792851
Chemphyschem. 2017 Jan 18;18(2):238-244. doi: 10.1002/cphc.201600993. Epub 2016 Dec 15.

Palladium-platinum bimetallic catalysts supported on alumina with palladium/platinum molar ratios ranging from 0.25 to 4 are studied in dry lean methane combustion in the temperature range of 200 to 500 °C. Platinum addition decreases the catalyst activity, which cannot...

A micro-transducer matrix design for the detection of flexural guided waves.

Ultrasonics

El Rammouz H, Benmeddour F, Assaad J, Moulin E, Smagin N, Dupont L, Chehami L, Zaatar Y, Herro Z.
PMID: 33932641
Ultrasonics. 2021 Aug;115:106430. doi: 10.1016/j.ultras.2021.106430. Epub 2021 Apr 23.

In this paper, a new approach is proposed for the detection of ultrasonic guided waves using a LiNbO

Pump-probe localization technique of varying solid contacts.

The Journal of the Acoustical Society of America

Terzi M, Chehami L, Farin M, Moulin E, Aleshin V, Smagin N, de Rosny J, Benmeddour F.
PMID: 34241124
J Acoust Soc Am. 2021 May;149(5):2943. doi: 10.1121/10.0004820.

A baseline-free defect localization method in thin plates is proposed and tested. In this proof-of-concept work, a steel ball pressed against an aluminum plate is used to mimic a surface contact defect. The technique takes benefit of a repetitive...

Chaotic character of two-soliton collisions in the weakly perturbed nonlinear Schrödinger equation.

Physical review. E, Statistical, nonlinear, and soft matter physics

Dmitriev SV, Semagin DA, Sukhorukov AA, Shigenari T.
PMID: 12443351
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Oct;66(4):046609. doi: 10.1103/PhysRevE.66.046609. Epub 2002 Oct 14.

We analyze the exact two-soliton solution to the unperturbed nonlinear Schrödinger equation and predict that in a weakly perturbed system (i) soliton collisions can be strongly inelastic, (ii) inelastic collisions are of almost nonradiating type, (iii) results of a...

An autonomous low-power management system for energy harvesting from a miniaturized spherical piezoelectric transducer.

The Review of scientific instruments

Diab D, Lefebvre F, Nassar G, Smagin N, Isber S, El Omar F, Naja A.
PMID: 31370448
Rev Sci Instrum. 2019 Jul;90(7):075004. doi: 10.1063/1.5084267.

A new spherical vibrational energy harvesting device with an additional low power management circuit for optimizing the power transfer from the mechanical vibrations to a storage capacitor is presented. The device is devoted to underwater wireless sensor network applications...

Showing 1 to 12 of 17 entries