Экспериментальное обоснование установки ацетабулярного компонента с недопокрытием при эндопротезировании пациентов с тяжелой степенью дисплазии

Purpose. Estimation of critical value of acetabular component uncoverage enabling its implantation without an additional support. Methods. A comparative analysis of an original method for intraoperative measurement of uncoverage space of acetabular component based on the measurement of the depth of uncovered sector with X-ray control by the same technique was carried out. Mathematical computer modeling based on the finite element techniqueand the mechanical experiment were performed. Critical values of uncoverage enabling safe primary fixation of acetabular component were estimated in designed models. Results. High rate of coincidence of direct intraoperative and postoperative measurements by radiograms was obtained, testifying to the possibility of application of this technique of uncoverage estimation at the stage of preoperative X-ray planning in patients with different degree of dysplasia. Using the finite element technique and the mechanical experiment on pelvis models, a possibility of mounting anacetabular component with moderate uncoverage within 25% without screws and with significant uncoverage to 35% with additional two screws fixation was demonstrated.Цель работы - определение критической величины недопокрытия ацетабулярного компонента, при которой возможна его имплантация без использования дополнительной опоры. Методы. Проведен сравнительный анализ оригинального способа интраоперационного измерения площади недопокрытия вертлужного компонента, основанного на измерении глубины непокрытого сектора, с рентгеновской оценкой тем же способом. Осуществлены математическое компьютерное моделирование на основе метода конечных элементов и механический эксперимент. В разработанных моделях определялись критические величины недопокрытия, при которых возможно обеспечение надежной первичной фиксации ацетабулярного компонента Результаты. Выявлена высокая степень совпадения прямых интраоперационных и послеоперационных измерений по рентгенограммам, что свидетельствует о возможности применения данного метода оценки недопокрытия на этапе предоперационного рентгеновского планирования у пациентов с различной степенью дисплазии. С помощью метода конечных элементов и механического эксперимента на моделях таза показана возможность установки ацетабулярного компонента с умеренным недопокрытием в пределах 25% без винтов и со значительным недопокрытием до 35% с дополнительной фиксацией двумя винтами

Signatures of the slow solar wind streams from active regions in the inner corona

Some of local sources of the slow solar wind can be associated with spectroscopically detected plasma outflows at edges of active regions accompanied with specific signatures in the inner corona. The EUV telescopes (e.g. SPIRIT/CORONAS-F, TESIS/CORONAS-Photon and SWAP/PROBA2) sometimes observed extended ray-like structures seen at the limb above active regions in 1MK iron emission lines and described as "coronal rays". To verify the relationship between coronal rays and plasma outflows, we analyze an isolated active region (AR) adjacent to small coronal hole (CH) observed by different EUV instruments in the end of July - beginning of August 2009. On August 1 EIS revealed in the AR two compact outflows with the Doppler velocities V =10-30 km/s accompanied with fan loops diverging from their regions. At the limb the ARCH interface region produced coronal rays observed by EUVI/STEREO-A on July 31 as well as by TESIS on August 7. The rays were co-aligned with open magnetic field lines expanded to the streamer stalks. Using the DEM analysis, it was found that the fan loops diverged from the outflow regions had the dominant temperature of ~1 MK, which is similar to that of the outgoing plasma streams. Parameters of the solar wind measured by STEREO-B, ACE, WIND, STEREO-A were conformed with identification of the ARCH as a source region at the Wang-Sheeley-Arge map of derived coronal holes for CR 2086. The results of the study support the suggestion that coronal rays can represent signatures of outflows from ARs propagating in the inner corona along open field lines into the heliosphere.Comment: Accepted for publication in Solar Physics; 31 Pages; 13 Figure

Nanolocalized UV source of laser radiation

We show the results of optical nonlinear interaction of laser light with plasmonic nanostructures. Creation of a nanolocalized source of UV radiation (λ = 260 nm) of the record high intensity was demonstated. Possibility of use of the source for biomedical applications was shown

Nanolocalized UV source of laser radiation

We show the results of optical nonlinear interaction of laser light with plasmonic nanostructures. Creation of a nanolocalized source of UV radiation (λ = 260 nm) of the record high intensity was demonstated. Possibility of use of the source for biomedical applications was shown

Single photon transport by a moving atom through sub-wavelength hole

The results of investigation of photon transport through the subwavelength hole in the opaque screen by using single neutral atom are represented. The basis of the proposed and implemented method is the absorption of a photon by a neutral atom immediately before the subwavelength aperture, traveling of the atoms through the hole and emission of a photon on the other side of the screen. Realized method is the alternative approach to existing for photon transport through a subwavelength aperture: 1) self-sustained transmittance of a photon through the aperture according to the Bethe’s model; 2) extra ordinary transmission because of surface-plasmon excitation

Single photon transport by a moving atom through sub-wavelength hole

The results of investigation of photon transport through the subwavelength hole in the opaque screen by using single neutral atom are represented. The basis of the proposed and implemented method is the absorption of a photon by a neutral atom immediately before the subwavelength aperture, traveling of the atoms through the hole and emission of a photon on the other side of the screen. Realized method is the alternative approach to existing for photon transport through a subwavelength aperture: 1) self-sustained transmittance of a photon through the aperture according to the Bethe’s model; 2) extra ordinary transmission because of surface-plasmon excitation