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1.
Venzo de Sabbata P. I. Pronin C. Sivaram 《International Journal of Theoretical Physics》1991,30(12):1671-1678
We consider the possibility of finding experimental evidence of the fifth force with the measurement of a phase shift of neutron beams via an interferometric apparatus and also a possible rotation of the polarization plane of polarized neutron beams when torsion is introduced in a gravitational field. 相似文献
2.
We analyze the gauge ambiguity problem for the effective gravitational field from the standpoint of the measurement process. The motion of a test point particle playing the role of a measuring device is investigated in the field of a point gravitating mass in the one-loop approximation. We show that the gravitational field value determined from the effective equations of motion of the device explicitly depends on the Feynman gauge parameter. This dependence is essential in the sense that a gauge variation cannot be interpreted as a deformation of the reference frame, which leads to a gauge ambiguity in the values of observed quantities. In particular, this result disproves the hypothesis that gauge dependence is canceled in the effective equations of motion of a classical point particle. 相似文献
3.
Diffraction patterns produced by quasi-elastically backscattered electrons focused in a thin single-crystal Si(100)2×1 near-surface
layer have been studied. The measurements performed in the 0.6–2-keV range are compared with calculations made in the single-scattering
cluster approximation. This model is shown to describe adequately the experiment. An analysis is made of the relation among
the diffraction patterns observed for different silicon faces, and of the effect of the primary-electron beam orientation.
The relations governing the focusing of quasi-elastically backscattered electrons escaping from the crystal along the main
crystallographic directions have been established. The various aspects of the effect for backscattered electrons undergoing
inelastic interaction with the electron subsystem of the crystal have been investigated.
Fiz. Tverd. Tela (St. Petersburg) 40, 1364–1369 (July 1998) 相似文献
4.
We investigate the role of the torsion field at the quantum level. One-loop counterterms are calculated in the theory with terms quadratic in the torsion field. We have shown that the theory is finite at the one-loop level. 相似文献
5.
A. F. Pronin V. G. Kharchenko A. A. Bagatur'yants 《Chemistry of Heterocyclic Compounds》1976,12(12):1338-1340
The electronic structure of the thiapyrylium cation with allowance for and neglect of the 3d orbitals of sulfur was investigated by the self-consistent field MO LCAO method within the CNDO/2 (complete neglect of differential overlap) approximation. Inclusion of the 3d AO of sulfur in the basis leads to slight redistribution of the electron density to favor equalization of the charges on the carbon atoms. A qualitative correlation of the calculated populations of the atoms with the chemical shifts of the PMR spectrum of the thiapyrylium cation was obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1627–1629, December, 1976. 相似文献
6.
A. F. Pronin J. Kovač R. Kada V. G. Kharchenko 《Chemistry of Heterocyclic Compounds》1979,15(12):1279-1283
The a complexes of furan, thiophene, pyrrole, pyridine, and benzene with the hydride ion were calculated by the MINDO/3 method. The affinities of the indicated aromatic rings and a number of substituted furans for the H– ion were estimated. It is shown that the relative magnitude of the affinity correlates qualitatively with the experimental data on the relative rates of the reaction of the examined compounds with nucleophilic reagents. The following order of increasing reactivities of unsubstituted aromatic rings was obtained: pyrrole相似文献
7.
E. V. Mutseneck D. A. Loginov A. A. Pronin P. V. Petrovskii A. R. Kudinov 《Russian Chemical Bulletin》2007,56(9):1927-1929
Cationic arene complexes [Cb*Co(naphthalene)]+ (2, Cb* = C4Me4) and [Cb*Co(phenanthrene)]+ were synthesized by the reactions of [Cb*Co(MeCN)3]+ with arenes. The [Cb*Co(anthracene)]+ complex was synthesized by the abstraction of the iodide ion from [Cb*CoI]2 by TIBF4 in the presence of anthracene. Complex 2 exchanges the naphthalene ligand for other arenes at room temperature.
Dedicated to Academician G. A. Abakumov on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1861–1863, September, 2007. 相似文献
8.
Viktor A. Ilin Elena V. Pyzhik Anton B. Balakhonov Maksim A. Kiryushin Evgeniya V. Shcherbatova Andrey A. Kuznetsov Pavel A. Kostin Andrey V. Golovin Vladimir A. Korshun Vladimir A. Brylev Kseniya A. Sapozhnikova Alexey M. Kopylov Galina V. Pavlova Igor N. Pronin 《Molecules (Basel, Switzerland)》2023,28(1)
Central nervous system tumors related to gliomas are of neuroectodermal origin and cover about 30% of all primary brain tumors. Glioma is not susceptible to any therapy and surgical attack remains one of the main approaches to its treatment. Preoperative tumor imaging methods, such as positron emission tomography (PET), are currently used to distinguish malignant tissue to increase the accuracy of glioma removal. However, PET is lacking a specific visualization of cells possessing certain molecular markers. Here, we report an application of aptamers to enhancing specificity in imaging tumor cells bearing the epidermal growth factor receptor (EGFR). Glioblastoma is characterized by increased EGFR expression, as well as mutations of this receptor associated with active division, migration, and adhesion of tumor cells. Since 2021, EGFR has been included into the WHO classification of gliomas as a molecular genetic marker. To obtain conjugates of aptamers GR20 and GOL1-specific to EGFR, a 4-[18F]fluorobenzylazide radiotracer was used as a synthon. For the production of the synthon, a method of automatic synthesis on an Eckert & Ziegler research module was adapted and modified using spirocyclic iodonium ylide as a precursor. Conjugation of 4-[18F]fluorobenzylazide and alkyne-modified aptamers was carried out using Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) with/without the TBTA ligand. As a result, it was possible to obtain 18F-labelled conjugates with 97% radiochemical purity for [18F]FB-GR20 and 98% for [18F]FB-GOL1. The obtained conjugates can be used for further studies in PET analysis on model animals with grafted glioblastoma. 相似文献
9.
Dunaevskii S. M. Lobanova E. Yu. Mikhailenko E. K. Pronin I. I. 《Physics of the Solid State》2018,60(6):1214-1218
Physics of the Solid State - Ab initio calculations of the electron spectrum of the graphene–cobalt–nickel system were performed in the slope of the spin density functional theory... 相似文献
10.
A. G. Kanareikin E. Yu. Kaptelov S. V. Senkevich I. P. Pronin A. Yu. Sergienko O. N. Sergeeva 《Physics of the Solid State》2016,58(11):2325-2330
The factors responsible for the change in the orientation of the natural unipolarity vector due to heating to the Curie temperature of a Pt/PZT/Pt thin-film capacitor (PZT—lead zirconate titanate) formed on a TiO2/SiO2/Si substrate have been considered. Lead zirconate titanate thin layers containing a small excess of lead oxide have been formed ex situ using high-frequency magnetron sputtering with a variation in the annealing temperature (crystallization of the perovskite phase) in the range from 580 to 650°C. It has been assumed that the reorientation of the unipolarity vector in the PZT layer is caused by the change in the mechanism of crystallization of the perovskite phase with an increase in the annealing temperature. 相似文献