Why the concept of limit and its application
DR. Ali
Molkhasi
Assistant Professor, Department of Basic Sciences, Farhangian University, Tehran, IRAN.
author
text
article
2020
per
In this paper, we try to identify the weaknesses and strengths of solving the relevant problems by examining the definition of the function limit and provide a logical way to correct and improve the real understanding of the concept of the limit. For this purpose, while examining the definition of the function limit in the desired metric space, especially in the Euclidean metric space, we ask questions that can be answered by reflecting on understanding the concept of the definition of the limit. In the end, we describe the application of the definition of limit in daily life.In this paper, we try to identify the weaknesses and strengths of solving the relevant problems by examining the definition of the function limit and provide a logical way to correct and improve the real understanding of the concept of the limit. For this purpose, while examining the definition of the function limit in the desired metric space, especially in the Euclidean metric space, we ask questions that can be answered by reflecting on understanding the concept of the definition of the limit. In the end, we describe the application of the definition of limit in daily life.
پویش در آموزش علوم پایه
دانشگاه فرهنگیان
2645-3649
6
v.
19
no.
2020
1
9
http://basicscience.cfu.ac.ir/article_1167_bc4db881b60dfbeaf3974d5195563bad.pdf
Controlling the effect of Rashba and external magnetic field parameters on spin states of an electron in an anisotropic two-dimensional quantum dot
Dr. Fatemeh
Amiri
Assistant Professor, Department of Basic Sciences, Farhangian University, Tehran, Iran.
author
text
article
2020
per
The manipulation and control of electronic spin states play a major role in the construction of spintronics. To this end, one usually applies a magnetic field to remove the Kramers degeneracy, while the spin states are controlled and manipulated through the Rashba spin-orbit coupling, whose strength has been demonstrated to strongly depend upon gate voltages.In such nanostructures the conduction electrons form a two dimensional electron gas at the interface.This study is carried out when two electric fields, which cause electron confinement at the quantum dot, as well as an outer perpendicular magnetic field, which dissociate the spin states, are applied. In this article, we present the control of Rashba and external magnetic field parameters the time evolution of the electronic spin, of an electron in an anisotropic two dimensional (2D) Rashba quantum dot under the aforementioned conditions. Our study shows that the spin, while precesses on an ellipse, also wobbles strongly depend on the Rashba and magnetic field parameters.
پویش در آموزش علوم پایه
دانشگاه فرهنگیان
2645-3649
6
v.
19
no.
2020
10
21
http://basicscience.cfu.ac.ir/article_1172_79f7cb570b2af877eec2028c56b45fb1.pdf
An Introduction to the Necessity of Teaching "Fuzzy Theory" to Farhangian University Student-Teachers and Elementary Teachers
Dr. Shiva
Mafakheri
Department of Basic Sciences, Farhangian University, Tehran, IRAN.
author
text
article
2020
per
Factors emerge in educational situations with a degree of fuzzyness or uncertainty (eg, learning, mathematical modeling, and problem solving). In fact, the student's perception uses general dimensions that are gradually growing and therefore fuzzy. On the other hand, from the teacher's point of view, they usually correspond to the ambiguities about the student's degree of success at each stage of the educational situation. All of this reminds us of the need to introduce the principles of fuzzy logic and the theory of uncertainty in an attempt to describe more effective ways in the process of such class situations. Therefore, our aim in this paper is to construct a general fuzzy model that can be adapted at any particular stage to represent the process of the corresponding educational situation. We are dealing with educational issues, especially when faced with real-world issues. Uncertainty is the result of some intelligence flaws. In fact, model information in a real situation may be incomplete, erratic, unreliable, vague, inconsistent, or defective.
پویش در آموزش علوم پایه
دانشگاه فرهنگیان
2645-3649
6
v.
19
no.
2020
22
29
http://basicscience.cfu.ac.ir/article_1225_92145c21375a95fde20909501dbc14e2.pdf
Content analysis of the ninth grade mathematics textbook based on William Romey's technique and Bloom's cognitive domain
Dr.Gholam Hosein
Askari Robati
Mathematics Teacher,ehran, IRAN.
author
Zari
Khalili Kelaki
Faculty of Literature and Humanities, University of Gilan, Gilan, IRAN.
author
text
article
2020
per
The purpose of this study is to analyze the book of the ninth grade mathematics textbook year of 2018 - 19. This research is descriptive and uses content analysis method, which is in the target group in the applied research group . In this study , statistical sample was substituted for better and more accurate inference of the statistical Society . The data collection tools in this study include William Romey's content analysis form and Bloom's new classification of cognitive domain. Based on the coefficients of William Romey's content analysis form, the results show that the the book of the ninth grade mathematics was active in the text section ( including text and activities ) and was active in the pictures section in most chapters and in the questions section ( including exercises and work in Classes ) have been written at a high levels of Bloom's cognitive domain .
پویش در آموزش علوم پایه
دانشگاه فرهنگیان
2645-3649
6
v.
19
no.
2020
30
39
http://basicscience.cfu.ac.ir/article_1232_b47031614418e399c9c9b75e4a737587.pdf
Using Analogy Strategy in Science Education
Dr. Majid
Afshari
Assistant Professor, Department of Basic Sciences, Farhangian University, Tehran, IRAN.
author
Dr. Ali Akbar
Ebn Ali
Assistant Professor, Department of Basic Sciences, Farhangian University, Tehran, IRAN.
author
text
article
2020
per
Abstract: Science education focuses on extending learning and transferring skills to learners so that learners can effectively use the knowledge and skills gained in daily life and professional activities. Analogy is a process that learners apply knowledge and skills related to one domain in another domain by recognizing the similarities and differences between the two domains. The analogy is an essential cognitive ability that used in teaching and learning experimental sciences. In this paper, analogy, teaching models based on analogy and the importance of using them in teaching experimental sciences will be briefly introduced. Then, some of limitation and challenges of using analogy in teaching of science will be mentioned. Then, some of limitation and challenges of using analogy in teaching of science will be mentioned. Then, some of limitation and challenges of using analogy in teaching of science will be mentioned. Then, some of limitation and challenges of using analogy in teaching of science will be mentioned.
پویش در آموزش علوم پایه
دانشگاه فرهنگیان
2645-3649
6
v.
19
no.
2020
40
47
http://basicscience.cfu.ac.ir/article_1235_89972dc9e8c64f27cef8389a5dba7259.pdf
Content Analysis of biology book in grades twelfth based on Merrill's taxonomy of educational objectives
Fateme
Riyahi Estahbanati
Student of Farhangian University, Tehran, IRAN.
author
Dr. Leyla
Rezaeian
Assistant Professor, Department of Basic Sciences, Farhangian University, Tehran, IRAN.
author
text
article
2020
per
This descriptive and analytical research aimed to analyze the content of 12th grades high school biology book based on Merrill instructional objectives. The statistical population and sample population biology textbook of 12th grade is published in 1398. Quantitative analysis was performed using descriptive statistics including frequency, percent as well as two-dimensional tables according to Merrill's design,and the following results were obtained: -The content of the book focuses more on theoretical knowledge and concepts as well as on application performance. -Match between levels desired in initial presentation. - High correlation between parameters in secondary presentation -The proportion between Merrill's four proposed principles in the book's content The book's weaknesses are its lack of attention to practical knowledge and the practice of discovery. The element of rules and regulations has been adequately used, This is one of the strengths of the book, and it follows Piaget's cognitive theory. Other strengths include the proper use of secondary presentation components that make the book stand out and make learning easier and more sustainable. It can be concluded that the book is largely consistent with Merrill's teaching model. The findings of this study can assist education practitioners in providing appropriate content in the biology textbook.
پویش در آموزش علوم پایه
دانشگاه فرهنگیان
2645-3649
6
v.
19
no.
2020
48
57
http://basicscience.cfu.ac.ir/article_1236_118025763bda22970a034c9ba61710b6.pdf