The local crystallization in nanoscale diamond-like carbon films during annealing

The local crystallization during annealing at 600° C in nanoscale diamond-like carbon coatings films grown by pulsed vacuum-arc deposition method was observed using modern techniques of high-resolution transmission electron microscopy. The crystallites formed by annealing have a face-centred cubic crystal structure and grow in the direction [011] as a normal to the film surface. The number and size of the crystallites depend on the initial values of the intrinsic stresses before annealing, which in turn depend on the conditions of film growth. The sizes of crystallites are 10 nm for films with initial compressive stresses of 3 GPa and 17 nm for films with initial compres- sive stresses of 12 GPa. Areas of local crystallization arising during annealing have a structure dif- ferent from the graphit

Properties of coatings on the basis of carbon, tungsten, boron, and titanium obtained by the pulsed vacuum-arc method

Results of an investigation of the properties of coatings on the basis of carbon, tungsten, boron, and titanium obtained by the pulsed vacuum-arc method are presented. It has been found that the adhesion characteristics of coatings based on boron and titanium may be improved using a composite carbon-based coating, doped with tungsten, boron, and titanium, which, moreover, has a microhardness greater than those of a coating based on titanium and boro

Nanostructured coatings based on amorphous carbon and gold nanoparticles obtained by the pulsed vacuum-arc method

Nanostructured coatings based on diamond-like carbon and gold-doped carbon with a thickness of 100-300 nm were obtained by a pulsed vacuum-arc method on silicon substrates. The structure of the coatingswas studied by high-resolution transmission electron microscopy, the elemental composition was studied by X-ray microanalysi

Comparative analysis of tissue reactions during implantation of endoprostheses made of polytetrafluoroethylene in the anterior abdominal wall

The objective of this research was a comparative study of the reaction of the tissues of the anterior abdominal wall to the PTFE-endoprosthesis with a DLC-coating at long-term experimental stage

Properties of carbon coatings obtained by pulsed high power methods of vacuum-arc and magnetron sputtering

Investigation results of the structure, mechanical, tribological and adhesion characteristics of carbon coatings obtained by two different methods: high-power impulse magnetron sputtering and pulsed cathodic arc deposition are presente

A study of the influence of irradiation of carbon diamond-like coatings with nanosecond laser pulses on their structural-phase composition and tribological properties

Using the methods of Raman spectroscopy, optical metallography and scanning electron microscopy, combined with the measurements of tribological characteristics, special aspects of the formation of microrelief and variation of the structural-phase state of carbon coatings formed on the surface of AISI 321 heat-resistant steel by pulsed cathodic arc deposition followed by their irradiation with nanosecond laser pulses are studie

Радиомический анализ для объективизации диагностики и комплексного лечения глиобластомы

Introduction. Glioblastoma is a neuroepithelial malignant brain tumour of predominantly astrocytic origin with an aggressive course and an extremely unfavorable prognosis. Since the median of overall survival with glioblastoma is 14.6 months after complex treatment that includes a combination of surgical treatment, radiation therapy and chemotherapy, the development a personalized approach in the diagnosis and treatment of glioblastomas is appeared to be urgent.Materials and methods. MRIs of a patient undergoing chemoradiotherapy for glioblastoma G4 were performed on the following MRI scanners: Philips Ingenia 1.5T and Philips Ingenia Ambient 1.5T. The analysis of MR-images was carried out using the Matlab 2021 apps.Results and discussion. MR-images were analyzed before and after surgery, and after a course of chemoradiotherapy. The statistical characteristics of the local brightness distribution of the lesion image, which are described by statistical texture parameters, were analyzed as informative features of the lesion area on the images. Initial confirmation of the ability to objectify diagnosis and treatment using the above statistical parameters of T2 MR images of lesion area has been obtained.Conclusion. The aim of further research in this area is to use radiomic study for planning and monitoring the treatment of high-grade gliomas, estimate disease outcomes, and analyze the response to complex treatments in a predictive way.Введение. Глиобластома – нейроэпителиальная злокачественная опухоль головного мозга преимущественно астроцитарного происхождения с агрессивным течением и крайне неблагоприятным прогнозом. Медиана общей выживаемости при глиобластоме составляет 14,6 месяца после комплексного лечения, включающего комбинацию хирургического лечения, лучевой терапии и химиотерапии, что диктует необходимость разработки персонализированного подхода в диагностике и лечении глиобластом.Материалы и методы: МРТ-исследования пациента, проходившего химиолучевое лечение по поводу глиобластомы G4, выполнялись на аппаратах: магнитно-резонансный томограф Philips Ingenia 1.5T и Philips Ingeniа Аmbition 1,5 Т. Анализ МРТ-изображений осуществлен с использованием пакета прикладных программ Matlab 2021.Результаты. Проанализированы МРТ-изображения до проведения хирургического вмешательства, после хирургического вмешательства и после курса химиолучевого лечения. В качестве информативных признаков очагов поражения на изображениях проанализированы статистические характеристики локального распределения яркости изображения очага поражения, которые описываются статистическими текстурными параметрами.Обсуждение. Получено первичное подтверждение возможности объективизации процесса диагностики и лечения по указанным статистическим параметрам Т2 МРТ-изображений очагов поражения.Заключение. Целью дальнейших исследований в данном направлении является применение радиомического анализа для планирования, мониторинга лечения глиом высокой степени злокачественности, для прогнозирования исходов заболевания, а также предиктивного анализа ответа на комплексное лечение

The effect that nitrogen ion irradiation and the deposition of a nanosize-thick carbon coating have on microhardness and crack-growth resistance in silicon

yesThe behavior of silicon wafers in the starting state (after both irradiation with nitrogen ions and after nitrogen ion irradiation and the deposition of an 80-nm-thick carbon coating) has been investigatedBelgorod State Universit

The effect that nitrogen ion irradiation and the deposition of a nanosize-thick carbon coating have on microhardness and crack-growth resistance in silicon

The behavior of silicon wafers in the starting state (after both irradiation with nitrogen ions and after nitrogen ion irradiation and the deposition of an 80-nm-thick carbon coating) has been investigatedyesBelgorod State Universit