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61.
Possibility of electrochemical synthesis of polymeric coatings based on copolymers of 1-vinyl-1,2,4-triazole and 1-vinylimidazole with acrylic acid at iron and copper electrodes with aryldiazonium salt as initiator has been demonstrated. Dielectric properties of the so prepared polymeric coatings have been studied. Degradation of 1-vinylimidazole copolymers with acrylic acid has been slower than that of other acrylic acid copolymers. 相似文献
62.
K. S. Margaryan S. H. Sargsyan A. S. Sargsyan 《Russian Journal of Applied Chemistry》2016,89(8):1261-1264
Possibility of electrochemical formation of metal-polymeric nanocomposites and coatings on purely iron and steel electrodes by combining the electrochemically initiated (co)polymerization of 1-vinylimidazole and acrylamide with the cathodic deposition of metals was studied. Polymeric coatings were formed by the method of contact exchange of metals. The structure and selected properties of metal-polymeric coatings were examined. It was found that silver nanoparticles are uniformly distributed in the polymeric matrix. A thermogravimetric analysis demonstrated that the metal-polymers synthesized possess a high thermal stability. 相似文献
63.
V. K. Abrahamyan N. H. Hakobyan V. M. Aroutiounian H. L. Margaryan D. L. Hovhannisyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2010,45(6):278-285
We investigate theoretically and experimentally the process of turn-on time control of a nematic liquid crystal (NLC) based
phase retarder by means of an additional control voltage. We propose a theoretical model of reorientation of NLC molecules
in crossed electric fields (conventional transverse field and additional longitudinal field). The dynamics of reorientation
of NLC molecules is considered depending on the ratio of amplitudes of control voltages. We show the possibility to reduce
the turn-on time in NLC-based phase-retarder management by means of two control voltages. 相似文献
64.
Patrick Achenbach Carlos Ayerbe Gayoso Ralph Böhm Olga Borodina Damir Bosnar Vakkas Bozkurt Luka Debenjak Michael O. Distler Anselm Esser Ivica Friščić Yuu Fujii Toshiyuki Gogami Mar Gómez Rodríguez Osamu Hashimoto Satoshi Hirose Hiroki Kanda Masashi Kaneta Eunhee Kim Junichiro Kusaka Amur Margaryan Harald Merkel Ulrich Müller Sho Nagao Satoshi N. Nakamura Josef Pochodzalla Christophe Rappold Joerg Reinhold Takehiko R. Saito Alicia Sanchez Lorente Salvador Sánchez Majos B. Sören Schlimme Matthias Schoth Florian Schulz Concettina Sfienti Simon Širca Liguang Tang Michaela Thiel Kyo Tsukada 《Few-Body Systems》2014,55(8-10):887-892
At the Mainz Microtron MAMI exploratory experiments on the spectroscopy of mesonic weak decays (MWD) of electroproduced Λ-hypernuclei were performed. A unique setup was realized to use the broad momentum-band kaon spectrometer Kaos at zero degree angle with respect to the high-intensity electron beam direction to tag strangeness producing processes. A sample of order 103 MWD from a beryllium target was collected by the coincidence technique with the high-resolution multi-spectrometer facility of the A1 Collaboration. It is conjectured that this sample contains monochromatic two-body decays from stopped hyperfragment decays as well as a wide momentum distribution of quasi-free produced Λ- and Σ-hyperon decays and three-body decays from hyperfragments. Stopped hyperfragments will be identified as monochromatic peaks in the π ? momentum spectrum from which their masses can be extracted with a precision of 50 keV/c 2. 相似文献
65.
L. V. Gyul'budagyan N. A. Margaryan V. G. Durgaryan 《Chemistry of Heterocyclic Compounds》1971,7(12):1562-1564
1-(2-Methyl-4-hydroxy-6-carboxy-3-quinolinyl)-3-butanone and 1-(2-methyl-4-chloro-6-carboxy-3-quinolinyl)-3-butanone were obtained by the acid hydrolysis of 2-methyl-3-(3-chloro-2-buten-1-yl)-4-hydroxy(chloro)quinoline-6-carboxylic acids and their esters.See [6] for communication XVI.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1681–1682, December, 1971. 相似文献
66.
A. Margaryan A. Margaryan J.H. Choi F.G. Shi 《Applied physics. B, Lasers and optics》2004,78(3-4):409-413
Luminescence, absorption and electron spin resonance (ESR) spectroscopic measurements are performed for two new Mn2+ doped fluorophosphate glass systems containing bismuth and lead, respectively, i.e., 45Ba(PO3)2-55BiF3 and 45Ba(PO3)2-55PbF2, to elucidate the nature of dopant–ligand bonding in terms of the covalence degree of dopant–ligand bond and ligand field strength. It is found from luminescence measurements that an octahedral coordination of dopant is formed, which is the same as that in fluoroberyllate and phosphate glasses. The optical absorption measurements indicate that the position of the absorption band, 4T1g(G), is red shifted, and the Racah coefficient B is 625 and 627 cm-1, respectively, as ligand field strength increases in the order of fluoroberyllate, fluorophosphate, phosphate and silicate glasses. The hfs constant A determined from the ESR measurements is 94.33 and 92.12 Oe for two glass systems, respectively. The hfs constant A is also found to be 89.98 Oe and 94.33 Oe in the respective crystalline and glasses 45P2O5-55BiF3. In addition, the resonance observed at g2 in both glass systems is mainly attributed to Mn2+ ions in an environment close to octahedral symmetry distorted by agglomeration of resonant centers. It, thus, can be concluded from the ESR measurements that the degree of covalency of dopant–ligand bond in both fluoroberyllate and phosphate glasses is similar, and the crystallization of the glass leads to an increase in the degree of covalency of the ligand–Mn2+ bond. PACS 42.70.Ce; 61.43.Fs; 78.55.Qr 相似文献
67.
Miyoshi T Sarsour M Yuan L Zhu X Ahmidouch A Ambrozewicz P Androic D Angelescu T Asaturyan R Avery S Baker OK Bertovic I Breuer H Carlini R Cha J Chrien R Christy M Cole L Danagoulian S Dehnhard D Elaasar M Empl A Ent R Fenker H Fujii Y Furic M Gan L Garrow K Gasparian A Gueye P Harvey M Hashimoto O Hinton W Hu B Hungerford E Jackson C Johnston K Juengst H Keppel C Lan K Liang Y Likhachev VP Liu JH Mack D Margaryan A Markowitz P Martoff J Mkrtchyan H Nakamura SN Petkovic T Reinhold J Roche J 《Physical review letters》2003,90(23):232502
High-energy, cw electron beams at new accelerator facilities allow electromagnetic production and precision study of hypernuclear structure, and we report here on the first experiment demonstrating the potential of the (e,e'K+) reaction for hypernuclear spectroscopy. This experiment is also the first to take advantage of the enhanced virtual photon flux available when electrons are scattered at approximately zero degrees. The observed energy resolution was found to be approximately 900 keV for the (12)(Lambda)B spectrum, and is substantially better than any previous hypernuclear experiment using magnetic spectrometers. The positions of the major excitations are found to be in agreement with a theoretical prediction and with a previous binding energy measurement, but additional structure is also observed in the core excited region, underlining the future promise of this technique. 相似文献
68.
Two couples of low pressure multi-wire proportional chambers (MWPC) were located in the target chamber to detect fission fragments in a hypernuclei producing experiment at Thomas Jefferson National Laboratory (Jlab). In the experiment, a continuous wave (CW) electron beam was applied to form hypernuclei by electromagnetic interaction. In the target chamber, the high energy (1.853 GeV) and high intensity (500 nA) primary electron beam caused a high particle background, which influenced the detection of the fission fragments. This report described the design of the MWPCs and studied the fission-fragment detecting performance of them under such a high background. The efficiency of the MWPCs was given with the help of a high resolution kaon spectrometer. At the same time, the background particles were discussed with a Monte Carlo code based on GEANT4. 相似文献
69.
V. N. Margaryan 《Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences)》2014,49(3):126-138
For a class of polynomials a necessary and sufficient condition is found for those polynomials to be hypoelliptic with respect to a group of variables. 相似文献
70.
H. G. Ghazaryan V. N. Margaryan 《Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences)》2014,49(5):212-222
The results by Görding, Larsson, Cattabriga, Rodino, Calvo on correctness of Cauchy problem for N-hyperbolic equations are generalized. We prove that in the general case where the vector N = (N 1, …,N n ) is different from the vector (1, 0, …, 0), for the correctness of the Cauchy problem more stronger condition is required, which we call weighted hyperbolicity condition. We also discuss the properties of polynomials possessing weighted hyperbolicity property. 相似文献