Linear and nonlinear relations between DSC parameters and elastic moduli for chemically and thermally treated human hair

Against the practical context of thermal straightening, hair samples were obtained with a chemical (bleaching) as well as a cumulative thermal history (0–800 s, 200 °C). On these samples, tensile testing and DSC analysis, both in the wet state, were conducted to obtain the elastic moduli Ew as well as denaturation temperatures TD and enthalpies ΔHD. 3D plots show overall linearity for the relationships between the parameters for natural hair. For bleached hair, pronounced nonlinearities develop beyond 300 s of thermal treatment. At this stage, TD as well as Ew approaches limiting values, consistent with the state of a highly cross-linked, thermoset polymer. 2D projections are used to investigate the correlations between pairs of parameters. The results show that bleaching imparts a specific sensitivity for thermal damage, namely, to the matrix proteins, which more readily than the intermediate filaments (IF) turn into a thermoset. Overall, correlations between parameters hold well prior to the thermoset range. It is thus suggested that tensile testing to determine the elastic modulus and DSC come to consistent and equivalent results, at least, for the current experimental context. However, while Ew combines contributions of IFs and matrix, DSC differentiates the specific property changes of these components. © 2019, The Author(s)

Комплексный подход к выбору технологии гидравлического разрыва пласта на нефтяных месторождениях

Объектом исследования является расклинивающие материалы, применяемые при проведении гидравлического разрыва пласта. Целью данной выпускной квалификационной работы является изучение технологий проведения ГРП, видов расклинивающих материалов и промыслового опыта применения расклинивающих материалов. В процессе исследования были рассмотрены новые технологии проведения ГРП, виды расклинивающих материалов и новые разработки в этой области. Выполнен расчет необходимого количества проппантов для проведения ГРП на скважине номер 872 Рыбального месторождения.The object of the study is propping materials used in hydraulic fracturing. The purpose of this final qualification work is to study hydraulic fracturing technologies, types of proppants and field experience in the use of proppants. In the course of the study, new hydraulic fracturing technologies, types of proppants and new developments in this area were considered. The calculation of the required amount of proppants for hydraulic fracturing was performed on well 872 of the Rybalnoye field

Ground water regimes containing country rock minerals in Southern Kuzbass (case study: Narysk-Ostashkin)

The paper describes the calculation results revealing groundwater in equilibrium to carbonates and aluminosilicate minerals of country rocks in Narysk-Ostashkinsk area. It was proved that groundwater is in nonequilibrium to primary (endogenous) minerals in which they dissolve, however are in equilibrium to clays and carbonates which precipitate in the groundwater. The groundwater composition varies

Анализ и выбор оптимальной технологии проведения работ по реконструкции компрессорного цеха линейно-производственного управления магистральных газопроводов

На основе нормативно-технической документации выбрана оптимальная технология проведения ремонтных работ на компрессорном цехе. Разработаны рекомендации по проведению ремонтных работ по реконструкции компрессорного цеха. Рассчитаны показатели энергоэффективности и коэффициенты технического состояния газоперекачивающих агрегатов до и после реконструкции компрессорного цеха.On the basic of technical documentation the optimal technology of repair at the compressor department was chosen. Recommendations for the repair work on the reconstruction of the compressor department. The energy efficiency indicators and the technical state coefficients of gas compressor units before and after the reconstruction of the compressor department are calculated

Pervin Abla

Mahmut Yesari'nin Yeni Ses'te tefrika edilen Pervin Abla adlı romanıArşivdeki eksikler nedeniyle romanın tam metni verilememiştir