Alexander V. Vinogradov

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An approach to treating experimental reflectometry and ellipsometry data for bulk samples covered by an overlayer is suggested. This approach can be used for measurement of optical constants of solids, characterization of overlayers, and probing the abruptness of the spatial distribution of a bulk dielectric function. Numerical simulation shows that in the(More)
Spasticity in children cerebral palsy has its own peculiarities due to the presence of pathological tonic reflexes, pathological sinkinetic activity during arbitrary movements, disturbance of coordinative interactions of muscle synergists and antagonists, increase of total reflex excitability. Physiotherapeutic methods, massage, therapeutic exercises,(More)
The review is devoted to main neurosurgical approaches to the treatment of the spasticity syndrome in children cerebral palsy. Neurosurgical procedures are divided into destructive and neuromodulating. The former included posterior selective rhizotomy, selective neurotomy and destructive operations on subcortical brain structures. The latter group included(More)
Reproductive function and treatment results have been analysed for 59 patients aged 17 to 32 years after herniotomy. 28 and 31 of them underwent standard and endosurgical interventions, respectively. The control group consisted of 30 healthy males matched for age. As shown by 6-month follow-up, the endosurgical herniotomy was not associated with such(More)
The chemical reaction of a sample with atmospheric gases causes a significant error in the determinantion of the complex refractive index n = 1 - delta + ibeta in the extreme-ultraviolet region. The protection of samples removes this effect but hampers the interpretation of measurements. To overcome this difficulty, we derive the exact dependences on film(More)
Sc-Si multilayers are suggested as high-reflectivity coatings for a VUV interval of 35-50 nm. Fabricated mirrors show normal-incidence reflectivity of 30-54%, which is high enough for effective manipulation of the beams of compact-discharge, laser-driven x-ray lasers. The values obtained are not, however, limits for Sc-Si coatings. Theoretical estimations(More)
We have demonstrated near-wavelength resolution microscopy in the extreme ultraviolet. Images of 50 nm diameter nanotubes were obtained with a single ~1 ns duration pulse from a desktop-size 46.9 nm laser. We measured the modulation transfer function of the microscope for three different numerical aperture zone plate objectives, demonstrating that 54 nm(More)
The possibility of making multilayer reflecting coatings by using materials whose dielectric susceptibility is very near to unity at the frequency under consideration is discussed. For the pair of substances with a given Ree and Ime the explicit expressions are obtained for the value of reflection coefficient and for the optimum thickness of layers. The(More)
Images with a spatial resolution of 120-150 nm were obtained with 46.9 nm light from a compact capillary-discharge laser by use of the combination of a Sc-Si multilayer-coated Schwarzschild condenser and a free-standing imaging zone plate. The results are relevant to the development of compact extreme-ultraviolet laser-based imaging tools for nanoscience(More)