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71.
Scattering of a tonal low-frequency (up to 400 Hz) acoustic signal on a rough surface during its propagation along stationary
paths in a shallow water area is considered. A calculation technique of estimating the spectral power density of the signal
scattered at wind waves (reverberation) given an arbitrary angular distribution of the wind wave is developed based on the
Bragg scattering model. The obtained results are compared with the results of numerical simulation of resonant sound scattering
at surface perturbations according to an algorithm proposed by the authors, as well as with the results of experimental investigations. 相似文献
72.
E. L. Borodina A. I. Malekhanov A. I. Khil’ko 《Radiophysics and Quantum Electronics》2011,54(4):235-250
We study the influence of a bottom-sediment layer on the spatio-temporal structure of wideband acoustic pulses in shallow
sea. The shallow sea is modeled as a uniform liquid layer above a layer of liquid sediments located on an elastic half-space.
The influence of various acoustic parameters of the problem, in particular the thickness of the sedimentary layer, damping
parameters, etc. on the structure of wideband pulses is considered. We analyze the features of constructive mode interference
due to which the spatial structure of the pulses takes the form of beams. 相似文献
73.
74.
Trushina D. B. Borodina T. N. Sulyanov S. N. Moiseeva J. V. Gulyaeva N. V. Bukreeva T. V. 《Crystallography Reports》2018,63(6):998-1004
Crystallography Reports - Nanostructured spherical calcium carbonate particles with average sizes of 3.8 µm and 550 nm have been fabricated. Optimal conditions for adsorption of central... 相似文献
75.
A Collaboration P.?Achenbach C.?Ayerbe Gayoso R.?B?hm O.?Borodina D.?Bosnar V.?Bozkurt P.?Byd?ovsky L.?Debenjak M.?O.?Distler A.?Esser I.?Fri??i? Y.?Fujii T.?Gogami M.?Gómez Rodríguez O.?Hashimoto S.?Hirose H.?Kanda M.?Kaneta E.?Kim A.?Margaryan H.?Merkel U.?Müller S.?Nagao S.?N.?Nakamura J.?Pochodzalla C.?Rappold J.?Reinhold T.?R.?Saito A.?Sanchez Lorente S.?Sánchez Majos B.?S.?Schlimme M.?Schoth F.?Schulz C.?Sfienti S.??irca D.?Skoupil L.?Tang M.?Thiel K.?Tsukada 《The European Physical Journal A - Hadrons and Nuclei》2017,53(10):198
76.
Borodina YV Bolton E Fontaine F Bryant SH 《Journal of chemical information and modeling》2007,47(4):1428-1437
The size of conformational ensembles required for regular coverage of the conformational space of druglike molecules was examined. Using the conformer generation program Omega, the number of regularly distributed conformers (NRC) of flexible compounds was determined as a function of the root-mean-square deviation (RMSD) resolution of coverage. A regression equation was developed predicting the NRC of a molecule as a function of RMSD. The model yielded R(2) of 0.91 for both training and test sets, which consisted of 3414 and 3352 compounds, respectively. Utilizing 14 504 ligands from the Protein Data Bank with experimentally determined 3-D conformations, the regression equation was applied to the estimation of the NRC and the success rate of reproduction of experimental conformations from a theoretical conformation ensemble as a function of RMSD and flexibility was explored. 相似文献
77.
V. N. Losev E. V. Borodina O. V. Buiko N. V. Maznyak A. K. Trofimchuk 《Journal of Analytical Chemistry》2014,69(5):413-419
It has been found that silica chemically modified with dipropyl disulfide groups (DPDSS) quantitatively extracts palladium(II) from solutions in the acidity range from 4 M HCl to pH 4 and gold(III) in the range from 1 M HCl to pH 2 with a partition coefficient at the level of n × 104 cm3/g. The adsorption of palladium(II) and gold(III) at room temperature is highly selective, whereas non-ferrous and other platinum metals are not adsorbed. Sorption-atomic absorption, sorption-ICP-atomic emission, and sorption-photometric methods for the determination of palladium and gold have been developed using DPDSS. The accuracy of the methods was tested by the analysis of certified reference samples. 相似文献
78.
A method for holographic observation of sound sources and passive inhomogeneities in acoustic waveguides is proposed. The method is based on the principle of coherent phase conjugation. A possibility of visual observation of both sound sources and stationary inhomogeneities of different kinds is experimentally verified. 相似文献
79.
80.
L V Popova V N Babin Yu A Belousov Yu S Nekrasov A E Snegireva N P Borodina G M Shaposhnikova O B Bychenko P M Raevskii N B Morozova A I Iiyina K G Shitkov 《应用有机金属化学》1993,7(2):85-94
On the basis of an earlier model of chemical carcinogenesis, the antitumor activity of the mono-, bi- and poly-nuclear ferrocene derivatives ferricenium tri-iodide (1), ferricenium tetrachloroferrate (2), 1, 1′-diethylferricenium triiodide: (3), N-(ferrocenylmethyl)hexamethylenetetramine tetrafluoroborate (4), bis(ferrocenylmethyl)benzotriazolium tetrafluoroborate (5), bis(ferrocenyl-α-ethyl)benzotriazolium tetrafluoroborate (6) and bis(ferrocenylmethyl)-2-methylbenzimidazolium tetrafluoroborate (7), and the oligomer (—Fc—CH2—Fc+˙—CH2—)7–8? (PF6)7–8 (8) was studied in vivo (Fc?C10H8Fe). The tumor models studied included MCH-11 (mouse sarcoma induced by methylcholantrene), P-815 (mouse mastocytoma of DBA/2 origin) and virus-induced Raucher leukemia (RLV). The cytotoxic effects of these preparations were examined against in vitro cultured normal murine cells (line L-929). The binuclear ferrocene derivatives 5, 6 and 7 inhibited the development of experimental tumors in mice. Ferricenium tri-iodide (1) was effective in Rauscher leukemia. Kinetic dependencies for most complexes had a two-phase character: the region of inhibition of tumorogenesis was followed by a region in which the complexes accelerated the development of this process. The link between the structure of compounds 1–8 and their antitumor effects is discussed. 相似文献