Inhibition Effect of N, N'-Dimethylaminoethanol on the Corrosion of Austenitic Stainless Steel Type 304

The effect of N,N'-dimethylaminoethanol on the corrosion of austenitic stainless steel type 304 in 3M H2SO4 has been studied by weight-loss method and linear polarization measurement in different concentrations of the compound. The inhibition efficiencies of the inhibitor compound on the corrosion of the stainless steel were evaluated through assessment of the anodic and cathodic polarization curves of the alloy, the spontaneity of the electrochemical process, inhibition mechanism and adsorption isotherm. The inhibitor efficiency increased with increase in the inhibitor concentration. Results obtained reveal that the inhibitor performed effectively on the stainless steel providing good protection against pitting and uniform corrosion in the chloride containing acidic solutions. The compound act through physiochemical mechanism on the stainless steel surface and obeyed Langmuir adsorption isotherm. The values of the inhibition efficiency calculated from the two techniques are in reasonably good agreement. Polarization studies showed that the compounds behave as mixed type inhibitor in the aggressive media

Inhibition effect of 2-amino-5-ethyl-1, 3, 4-thiadiazole on corrosion behaviour of austenitic stainless steel type 304 in dilute HCl solution

The corrosion inhibition of type 304 austenitic stainless steel by 2-amino-5-ethyl-1, 3, 4-thiadiazole (TTD) compound and the electrochemical behaviour in dilute HCl solution were investigated through potentiodynamic polarization test, mass loss techniques and potential measurements. The results show that the organic derivative is highly effective with a maximum inhibition efficiency of 70.22% from mass loss analysis, while 74.2% is obtained from polarization tests. Observation of the scanning electron micrographs shows the absence of corrosion products due to electrochemical influence of TTD on the surface morphology of the steel. X-ray diffractometry reveals the absence of phase compounds and complexes on the steel samples after exposure. TTD adsorption on the steel surface obeys the Langmuir, Frumkin and Freundlich adsorption isotherms. Corrosion thermodynamic calculations reveal the inhibition mechanism occurs through chemisorption process and results from statistical analysis depict the strong influence of inhibitor concentration on the electrochemical performance of the TTD

Inhibition Effect of 2-Amino, 5-Ethyl- 1, 3, 4 Thiadiazole on the Corrosion of Austenitic Stainless Steel Type 304 in Dilute Sulphuric Acid

The inhibition effect of 2- amino, 5- ethyl- 1, 3, 4 thiadiazole (TTD) compound on the corrosion of type 304 stainless steel in 3 M H2SO4 test solution was investigated using potentiodynamic polarization, weight loss techniques and open circuit potential measurements. Results showed TTD to be very effective with an average inhibition efficiency of 98% from weight loss analysis and 87% from polarization test. Data from open circuit potential measurement are well within passivation potentials at specific concentrations of TTD. Scanning electron microscopy showed the effect of the inhibiting compound on the surface topography of the steel, while X - ray diffractometry determined the phase compounds formed on the surface due to inhibitor adhesion. Adsorption of the compound was determined to obey the Langmuir isotherm model. Thermodynamic calculations showed the inhibition process occurred through chemisorption mechanism and results from statistical analysis revealed the overwhelming influence of inhibitor concentration over exposure time on the inhibition performance of the compound

Inhibition effect of butan-1-ol on the corrosion behavior of austenitic stainless steel (Type 304) in dilute sulfuric acid

The electrochemical behavior of austenitic stainless steel (Type 304) in 3 M sulfuric acid with 3.5% recrystallized sodium chloride at specific concentrations of butan-1-ol was investigated with the aid of potentiodynamic polarization, open circuit measurement and weight loss technique. Butan-1-ol effectively inhibited the steel corrosion with a maximum inhibition efficiency of 78.7% from weight-loss analysis and 80.9% from potentiodynamic polarization test at highest concentration studied. Adsorption of the compound obeyed the Freundlich isotherm. Thermodynamic calculations reveal physiochemical interactions and spontaneous adsorption mechanism. Surface characterizations showed the absence of corrosion products and topographic modifications of the steel. Statistical analysis depicts the overwhelming influence and statistical significance of inhibitor concentration on the inhibition performanc

Volume One (Birgit Krohn Albums)

The first of Birgit Krohn\u27s three albums containing printed and manuscrip] music, much of which was likely collected during her time at Nikka Vonen\u27s school for girls in Dale, Norway.https://scholarexchange.furman.edu/krohn-album1/1000/thumbnail.jp

Directions of Preparation of Future Teachers to the Use of Distance Learning Technologies in Professional Activity (Praxiological Aspect of the Activity Approach)

The aim of the article is to demonstrate the need of preparing future teachers to use distance learning technologies in the professional activities. Introduction in educational process of distance learning technologies contributes to improving the quality of education. Methods. The authors’ technique of preparation of students of pedagogical specialities to work in the information-educational environment is designed on the basis of the analysis and generalisation of numerous scientific publications. Results. The system of training to implementation of the distance learning technologies in the teaching activity is developed and described, consisting of the following directions: realisation within the program of the principal educational program of specialised training courses in variable-based curriculum parts; the organisation of educational and research activity of students with the use of distance learning technologies; classroom-based and extracurricular independent work of students directed to designing of teaching and learning aids and materials on the basis of distance learning technologies; application of elements of distance learning technologies for students’ teaching; attraction of students to formation of corpus of multimedia educational resources of university. The purposes, the content and expected results of each direction are specified. Scientific novelty. The authors point out that concrete scientifically wellfounded methodical recommendations for the future teachers on implementation of distance learning technologies haven’t been presented in the Russian literature till now; despite an abundance of scientifically-information sources of distance learning technologies and sufficiently high-leveled degree knowledge of the issues of its efficiency in educational activity, conditions of introduction of such technologies in high school, construction of models of distance training. Authors of article have tried to close this gap. Practical significance. The authors of the presented study propose and describe task-oriented, stage-by-stage, consistent preparation of the future teachers for an effective usage of distance learning technologies. Such preparation allows teachers to rationalize teaching and training processes, to improve means of monitoring, diagnostics of educational activity; it considerably expands didactic, information, methodical and technological possibilities of pedagogical activity В статье обосновывается необходимость подготовки будущих учителей к использованию в предстоящей профессиональной деятельности дистанционных образовательных технологий (ДОТ), внедрение которых в учебный процесс способствует повышению качества образования. Методы и методики. На основе анализа и обобщения многочисленных научных публикаций создана авторская методика подготовки студентов педагогических специальностей к работе в информационно-образовательной среде. Результаты. Разработана иописана система обучения применению ДОТ в преподавательской деятельности, состоящая из следующих направлений: реализация в рамках основной образовательной программы специализированных учебных курсов в вариативной части учебного плана; организация учебной и научно-исследовательской деятельности студентов с использованием ДОТ; аудиторная и внеаудиторная самостоятельная работа студентов по проектированию учебно-методических материалов на основе ДОТ; применение элементов ДОТ в период педагогической практики; привлечение студентов к формированию фонда мультимедийных образовательных ресурсов университета. Указаны цели, содержание и ожидаемые результаты каждого направления. Научная новизна. Несмотря на обилие научно-информационных источников о ДОТ и достаточно высокую степень изученности вопросов их эффективности в учебной деятельности, условий внедрения этих технологий в вузе, построения моделей дистанционного обучения, конкретных научно обоснованных методических рекомендаций для будущих педагогов по применению ДОТ в отечественной литературе до сих пор нет. Авторы статьи попытались восполнить этот пробел. Практическая значимость. Изложенная в статье целенаправленная, поэтапная, последовательная подготовка будущих педагогов к эффективному использованию ДОТ позволяет рационализировать процессы преподавания и обучения, усовершенствовать средства мониторинга, диагностики образовательной деятельности, значительно расширяет дидактические, информационные, методические и технологические возможности учебного процесса

Prerequisites for the digital transformation of the Russian education system

Abstract: The authors note the tendency of digital transformation of different spheres of human activity. Many scientific studies describe the results of the digital transformation of education, characterize ways of adapting teachers and students to the conditions of the new digital environment and consider the formation of digital competencies of teachers and digital literacy of students. At the same time, scientists do not consider the reasons that actualize digital transformation. The purpose of the study is to identify external and internal factors that determine the digital transformation of the Russian education system at the present stage of development of society. The authors are building a causal relationship model of the digital transformation of the education system. The authors choose the principles of a systematic approach as the methodological basis of the study. They consider the digital transformation of education as a system of transformations that have a complex transformative effect. This impact is based on taking into account the diversity of interconnections between the components of the education system. The authors substantiate the nature of digital transformation as a large-scale transformation, as a process of implementing digital technologies, as an improvement in the quality of the results of the educational process. The authors consider the factors and results of digital transformation in various projections. In accordance with the ideas of a systematic approach, the authors describe the essence of digital transformation in the form of a causal relationship model of the digital transformation of the education system. The causal relationship model of the digital transformation of education allows us to systematically see the development trends of Russian education and in the future to develop the right strategies to improve its quality and competitiveness. The use of digital technologies in the educational process provides a rational assessment of their need for solving specific educational problems. The main role of digital technologies consists in technological improvement of the educational process, expansion of the didactic capabilities of the teacher, activation and motivation of personal interaction between the teacher and students