s. a. azimi

{R1-1} Increasing environmental problems have led to the spread of Electric Vehicles (EVs). One of the attractive research fields of electric vehicles is the charging battery of this strategic product. Electric vehicle battery chargers often lack bidirectional power flow and the flexibility to handle a wide range of battery voltages. This study proposes a non-isolated bidirectional DC-DC converter connected to a T-type converter with a reduced number of switches to solve this limitation. The proposed converter uses a DC-DC converter that has an interleaved structure along with a three-level T-type converter with a reduced number of switches and a common ground for the input and output terminals. Space vector pulse width modulation (SVPWM) and carrier based sinusoidal pulse width modulation (CBPWM) control the converter for Vehicle to grid (V2G) and grid to Vehicle (G2V) operation, respectively. Theoretical analysis shows 96.9% efficiency for 15.8kW output power and 3.06% THD during charging with low battery voltage ripple. In V2G mode, it achieves an efficiency of 96.5% while injecting 0.5 kW of power into the 380 V 50 Hz grid. The DC link voltage is stabilized. The proposed converter also provides good performance for a wide range of battery development. The proposed converter offers high efficiency and cost reduction. It provides the possibility of charging a wide range of batteries and provides V2G and G2V power flow performance. The proposed converter is capable of being placed in the fast battery charging category. The ability to charge two batteries makes it a suitable option for charging stations.

The present study aimed to investigate and compare the extent of using educational technologies to enhance students’ critical thinking in Iranian and Russian first-grade elementary school experimental science textbooks.

The research employs descriptive-analytical method. Its sample consists of Iranian and Russian first-grade elementary school experimental sciences textbooks. The research instrument is a researcher-made checklist of critical thinking and soft and hard technology. The validity of this checklist was confirmed by experienced teachers and four professors in the field of educational sciences (educational technology and primary education). The reliability and validity of the tools have been calculated by using the formula of William Rumi.

The results of analyzing the content of the experimental sciences textbooks showed that the first-grade textbooks of both countries used hard and soft technologies to teach critical thinking. The percentage of using soft technology was 75.65% and that of using hard technology was 24.35% to foster the critical thinking spirit in the Iranian first grade textbooks of experimental sciences. Moreover, the percentage of using soft technology was 51.64% and that of using hard technology was 48.35% to enhance the critical thinking spirit in the Russian textbooks. In addition, among the components of critical thinking, the highest percentage of 25.49% in Iran was related to the engagement component and in Russia, the highest percentage of 32.02% was related to the engagement component. In Iran, the lowest percentage of 2.87% among the critical thinking components was related to the judgment and evaluation componentand in Russia, the lowest percentage of 3.84% was related to the judgment and evaluation component. Combining soft and hard technologies in the contents of the first-grade textbooks of experimental sciences provides the possibility of learning more effectively and makes the process of learning more attractive for the students. The percentage of the other components of critical thinking in Russia and Iran has been as follows: the component of appropriate questioning in Russia was 18.33% and 11.60% in Iran; the collectiveness component in Iran was 10.01% and 10.04 % in Russia; the analytical component in Russia was 7.30 %and 5.15 % in Iran; the argument component in Russia was 7.63% and 5.15 % in Iran; the composition component was 7.95 % in Russia and 5.6 % in Iran.

The composition of soft and hard technologies in the content of textbooks provide the possibility of more effective and attractive learning for the students. In fact, soft technologies complement and consolidate hard technologies and give rise to hard technologies and enable the growth and development of critical thinking and related areas. Hard technologies, as accessible and tangible tools, and soft technologies, as a set of ideas, plans, innovations, and initiatives which are crystaliized in educational design, determination and management of educational approaches and patterns, play an important role in increasing the effect of teaching and improving the students' learning. Hard technology in itself has no value; rather it is soft technologies that give credibility and value to hard technologies. It should be borne in mind that formal and superficial changes will not be responsive in revising the curriculum and fundamental logical changes are needed in all curriculum processes. As a result, researchers recommend the coherence and integration of critical thinking in educational textbooks. In this regard, the method of using hard and soft technologies and their implementation in the form of critical thinking components in the first year science textbook of Iran and Russia have been studied and emphasized.

The world-wide approach to using distance learning technology for education proves that the use of this tool has unique benefits for teaching and learning. However, the use of technology must be carefully monitored. Educational technologies are effective tools, but they do not do extraordinary work on their own. In fact, it is the proper use of them by stakeholders, including professors and students that grant these tools value, efficiency and effectiveness. One of the main features of technology is self-education; but in the course of self-learning, more basic skills must be established and strengthened, including the skills of self-knowledge, self-organization, and self-motivation to study, which ultimately lead to self-development. Appropriate use of educational technologies such as the use of content management systems and their facilities can potentially support the development of various stages of self-development. The use of educational technologies to achieve self-development is associated with significant efforts by teachers and time costs. In addition, professors must have sufficient knowledge, technical skills, talent and experience in this field. These efforts are complemented by a review of goals, content, and the selection of appropriate teaching methods. As a result, if professors are able to select appropriate information sources, analyze and combine different knowledge, it is possible to achieve a different qualitative result. However, there is not always coordination between various elements, and as a result, there are shortcomings in this area. The aim of this study was to examine the effect of self-development of students on their academic achievement through the use of distance learning technology by instructors.

This study was carried out in a statistics course using the quasi- experimental method (pretest-posttest). The statistical population of the study were 664 students in the field of the social sciences (economics and management) of Iranian and Russian virtual universities in the academic years of 2015-2017. 242 students (112 from Russia and 136 from Iran) were chosen among them based on Morgan's table.

The findings showed that there was a significant difference between the mean scores of pre-test and post-test of self-development and academic achievement of Iranian and Russian students.

The use of educational technology by faculty members has a significant effect on improving students' academic achievement and self-development. Usefulness of technologies can be more evident by targeted use of them. The results of this research remind us that a new and different look at technology and its applications is effective in creating new developments and experiences in education. In fact, the purpose of using technology in today's era should be to develop individual and self-development skills, in order to achieve the main goal of education, which is to train active learners who are ready for change, and thus they are able to come up with creative and thoughtful solutions to face the problems of life in the present century, as well as increase their academic performance.

In recent decades, the use of new information and communication technologies around the world has grown rapidly. The proliferation of personal computers, mobile phones or Android phones, and the easy access to the Internet provided by telephone operators have changed the lives of millions of people. These changes have directly and indirectly affected people's behaviors and habits, and even their cognitive and mental characteristics. As the use of the Internet by children and adolescents increases, there are concerns about their online safety. Providing a safe environment requires an in-depth understanding of the types of risks of the online environment, as well as effective solutions to reduce these risks. The issue of cyberspace abuses and the irreparable damage that this environment can do to personality and social image is a matter of consideration, the prevention of which is most of all the responsibility of the educational organizations, and particularly the family. The aim of this study was to investigate the relationship between parental supervisory styles and internet safety of children among male and female students of high school.

Descriptive correlational (structural equation modeling) method was used at this study. All the second grade students of high school in Dezful and their parents in the academic year of 2017-2018 were statistical population of this study. According to the sample size, 375 people were selected based on Krejcie and Morgan's tables. Stratified sampling method and random cluster sampling were used for sampling. Two standard questionnaires of determining parental supervisory styles and a researcher-made questionnaire of checking the internet safety of children on a Likert scale were used to collect data. Frequency distribution, mean, Pearson correlation coefficient, regression and structural equation model test were used to analyze the data.

The results showed that there is a significant difference between the parenting styles and the level of internet safety of children. Parents' cordial behavior with their children and their proper control give more confidence among family members. The child who feels such a climate feels safe in expressing his Internet needs, the things that are encountered in using the internet, as well as the questions and problems encountered when using the internet will be more comfortable to discuss these issues with parent.

The results show that the highest Internet security of children is observed in the authoritarian regulatory style, followed by the authoritarian style and the negligent style; while the lowest internet security is observed in the non-interfering style. The results also showed that there was a significant relationship between parental supervision style and parental Internet security. Parents' sincere behavior and their proper control provide more trust among family members. The child who feels this atmosphere feel more secure and comfortable to express their needs about the Internet, the events that occur in using the Internet, and the questions and problems that they have while using the Internet. Parents with a friendly style and proper control have taken the necessary precautions to use the Internet safely and avoid serious risks. They have clearly set their own rules and expectations for children to use the Internet. And children are aware that they must respect these rules and expectations in order to be loved by their parents. In fact, this group of parents are not far behind their children in issues such as Internet literacy and media literacy, and they know and practice the etiquette of dealing with their children when they use the Internet.