Table of Content

26 May 2020, Volume 39 Issue 3

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Sparse Approximation for Principal Component analysis via elastic net

Zhang Wenming, Fu Guanghui, Zhang Xiaohua

2020, 39(3):  1-5. 

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Principal component analysis (PCA) is widely used in many areas of scientific discoveries due to its dimension reduction and orthogonality of each principal component. However, The principal components are often the linear combinations of all the predictors and it is hard to achieve good model interpretability. In this paper, sparse approximation of the loadings of the principal components is induced by elastic net methods, and we established the sparse approximation principal component analysis (sPCA) algorithm. The sPCA not only keeps the advantages of original PCA, but also can greatly improve the model interpretability due to the sparsity of the loadings.

Error Bounds for Iinear Complementarity Problems of Nekrasov Matrix

Jiang Jianxin

2020, 39(3):  6-8. 

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On the basis of studying the upper bound of the infinite norm of the inverse matrix Nekrasov of A, using the classical linear complementary error bounds of strictly diagonally dominant matrices, the error bounds for linear complementarity of A is obtained.At the same time, the superiority of the estimator is illustrated by numerical examples.

Strategic Analysis of Concept Teaching in Advanced Mathematics

Xie Wei, Fang Guomin

2020, 39(3):  9-13. 

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Concept is the logical starting point of mathematics, and also the foundation of students learning mathematics. Compared with elementary mathematics, advanced mathematical concepts are not only strictly logical and highly abstract, but also more widely applied and “surrealistic” In teaching, concept introduction, concept formation, concept consolidation and concept application, should be combined with the characteristics of knowledge and the cognitive level of college students, then the corresponding teaching methods and effective teaching strategies should be adopted so as to achieve the teaching objectives and educational objectives.

Investigation and Research on Geometrical Intuition Ability of Yunnan Minority Junior Middle School Students

Cui Ping, Cui Qingmei, Chen Yuezhen, Pang Jinghua

2020, 39(3):  14-19. 

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In order to actively and effectively carry out mathematics education for minority students, effectively improve the mathematics level and achievements of minority students, and promote the comprehensive development of minority students,the literature data method, questionnaire survey method and teacher interview method are used to investigate the geometric intuitive ability of middle schools in minority areas of Yunnan. Through research, understand the current situation of the geometry intuitive ability of ethnic minority junior middle school students in Yunnan, and understand the methods and strategies of junior middle school teachers to implement geometry intuitive teaching. It provides a reference for further research on how to effectively improve the teaching and learning of the graphics and geometry courses in the junior middle school in Yunnan ethnic areas, and how to better improve the geometric intuitive ability of Yunnan minority ethnic junior middle school students.

Research on Teaching Strategy in the Field of “Synthesis and Practice” of Primary Mathematics ——Based on STEAM education

Shi Zheyu, Qian Likai

2020, 39(3):  20-23. 

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STEAM education is a project learning, problem-solving-oriented curriculum organization, emphasizing the cross-integration of multi-disciplinary, which plays an important role in cultivating students' innovative ability. The setting of the field of “synthesis and practice” in mathematics in primary school is to let students experience purposeful, designed, systematic and cooperative practical activities, and with the actual situation to experience the process of finding and raising problems, analyzing and solving problems. Teaching strategies in the field of “synthesis and practice” in primary school mathematics under the background of STEAM education: To determine diversified teaching objectives; To carry out practical teaching activities; To establish a “PBL”-based teaching model; To infiltrate the“ interdisciplinary ”teaching concept; To carry out socialized learning in the“second classroom ”; And to form a diversified evaluation mechanism.

The Derivation and Application of the Divergence and Curl of Vector Field ——In Orthogonal Curvilinear Coordinates

Yang Kuo, Li Li

2020, 39(3):  24-28. 

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In the textbook of mathematical physics method, the divergence and curl of vector field in orthogonal curvilinear coordinates are widely used but there is no general proof. Based on the definition and physical meaning of the divergence and curl, this paper gives the proof and typical application of the divergence and curl of the vector field in the orthogonal curvilinear coordinates using the basic calculus method,which is a good reference for students to understand and apply.

Friction and Wear Research of Silicon Surface under the Condition of Oil Lubrication of Squalane

Cai Fada

2020, 39(3):  29-34. 

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The tribological properties of the Si-GCr15 friction pair at different loads and speeds were investigated by UMT-2 tribometer under the oil-lubricated condition of squalane which is environmentally friendly. The wear trace of friction pair was also scanned by scanning electron microscopy and its wear mechanisms were analyzed. The results showed that the load was inversely proportional to the friction coefficient of the friction pair, and the effect of the velocity on the friction coefficient was mainly related to the temperature. Under the condition of oil lubrication, the wear trace of worn surface was smooth, and a transfer film was formed on the surface of the steel ball, which can effectively reduce the friction and wear of the friction pair.

Exploration on Physics Teaching of Middle School Based on Research-led Teaching Concept

Yang Shuqi, Li Qiongzhao, Shi Youming

2020, 39(3):  35-40. 

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With the development of network technology rapidly, the way for students to acquire knowledge is more convenient and extensive. This caused classroom teaching objectives changed from the low-level objectives of acquiring knowledge, understanding knowledge and applying knowledge to the high-level objectives of analyzing knowledge, comprehensively evaluating knowledge and knowledge innovation. The middle school stage is the key period to cultivate high-level thinking for students. Therefore, under the theoretical support of the research-led teaching concept by student-centered, the excellent physics class in middle school was explored and constructed. The mixed teaching mode was employed in the excellent physics class based on student-centered and teacher-guided, which contained inquiry teaching mode, task driven teaching mode, project decomposition teaching mode, problem-solving teaching mode, group cooperative-learning teaching mode and so on. Modern educational technology was adequately used in the excellent physics class to assist instruction. Practical results showed that the physics teaching of middle school based on the research-led teaching concept makes students change from passive learning to active learning, which effectively cultivate students' higher-level thinking and improve teaching efficiency.

Study on Two Speices of Russula by Infrared Spectroscopy Combined with Curve-fitting Analysis

Li Dongyu, Wang Yuan, Hu Fene, Yan Cuiqiong

2020, 39(3):  41-46. 

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Fourier transform infrared spectrometer was used to qualitative analysis the nutrients of Russula virescens and Russula vinosa. The infrared spectra showed that the main nutrients in these two mushroom species were polysaccharides, proteins and lipids. In the characteristic region of infrared spectra, the absorption bands were overlapped with each other, resulting in some spectral information were covered and difficult to obtain the contain information of nutrients. In this paper, second derivative spectroscopy, Fourier self-deconvolution spectroscopy combined with curve-fitting analysis were used to mine the hidden information of overlapping bands. The curve-fitting analysis of the peaks at around 1319, 1151, 936 and 887 cm^-1 showed that the content of β-D-glucan in Russula virescens was lower than that in Russula vinosa, but the content of starch was just the opposite. The results showed that Fourier transform infrared spectroscopy combined with data mining method could qualitative analysis the nutrients in mushrooms rapidly.

Detecion of nirite by Nano-ZnO modified electrodes

Fu Mingqiuhao, Wan Rongtai, He Zhangyu, Lin Zhongxia, Yang Haizheng

2020, 39(3):  47-51. 

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A simple and sensitive electrochemical analysis method for nirite detection based on electrochemical deposition nano-ZnO film on ITO electrodes was constructed. The ITO electrode modified by nano-ZnO was studied and characterized by electrochemical method. Under the optimum conditions, the differential pulse voltammetry (DPV) responses of ITO electrode modified by nano-ZnO toward NO₂^- was evaluated in a good linear range from 3.33×10^-8 to 3.33×10^-6 M, with a detection limit of 1.0×10^-7 M at S/N=3. The prepared electrochemical method exhibited advantages of simple preparation, easy surface renewal, better reproducibility and satisfactory stability. This modified electrode can be successfully applied to the determination of NO₂^- in a real sample without complex pretreatment.

Teaching Reform of Chemical Engineering Cartography and AutoCAD

Wang Zhijuan, Wang Liping

2020, 39(3):  52-57. 

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Aware of current existing problems in the teaching of chemical engineering cartography and AutoCAD, a series of educational reform measures were put forward in this paper. The teaching content was integrated into six modules and the actual projects carried through in all these modules as main line. Moreover, the modules were organized as a number of task cards of the reading and drawing of chemical engineering designs. The classroom teaching was organized efficiently via task-driven teaching method. In addition, the examination evaluation method was reformed. Due to these reform initiatives, the course was more practical and in line with the needs of students' career development. The students' ability of reading and drawing was improved significantly and the teaching effect was remarkable.

Design of a Simple and Fast Intelligent Thermometer Based on NTC Thermistor

Yang Qingzhi, Zhang Yunzhi

2020, 39(3):  58-62. 

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With the entry into force of The Minamata Convention on Mercury, the most commonly used mercury thermometers will be withdrawn from the market due to mercury toxicity, and electronic thermometers are inconvenient to be popularized and used due to their high price and limited life. In view of this situation, a simple and fast intelligent thermometer is designed, which uses NTC thermistor to collect temperature and MSP430 single-chip microcomputer to process function, can measure temperature quickly and realize intelligent alarm of abnormal temperature, it has high practical value.

Overview of Graph-Based Keyword Extraction Methods

Xu Jian, Sun Yu

2020, 39(3):  63-68. 

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Keyword extraction is an important step in the application of natural language processing (NLP). Its purpose is to capture the main subject of a document. Keyword extraction is widely used in Information Retrieval, Text Mining, and Natural Language Processing. Among the keyword extraction methods, the recent research mainstream is graph-based keyword extraction methods. To this end, this article reviews graph-based keyword extraction methods, analyzes and compares various graph-based methods, provides guidance for future research, and encourages the development of new graph-based keyword extraction methods.

‘Internet plus’ Teacher Eeducation Promotes the Balanced Development of Urban and Rural Education: from the Perspective of Online Curriculum Resources

Wang Ningbang

2020, 39(3):  69-77. 

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With the vigorous development of the Internet plus, the Internet plus has brought about profound changes in the field of education. ‘Internet +’ has broken through the restrictions of time and space, and has provided a dynamic support for the balanced development of urban and rural education. It has given full play to the optimization and integration of the Internet in the allocation of teacher education curriculum resources. It also deeply integrate the innovation achievements of the Internet with the field of teacher education curriculum resources, and continuously promote the construction and sharing of high-quality teacher education curriculum resources. The author analyzes the balanced development of teacher education network curriculum resources and promotes the development of urban and rural education. It explores the construction and application of the teacher education informatization, MOOC, and diversified teacher education network curriculum resources under the background of Internet plus, and coordinating the advantages of teachers' colleges and universities in integrating their own teacher education. To promote the balanced development of urban and rural education.

Reflection on the Reform and Popularization of Research-led Teaching and Learning ——Analysis Based on the Xi’an Jiaotong-Liverpool University

Liang Haiyan

2020, 39(3):  78-83. 

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With the rapid development of network technology, students' learning approaches have shown a trend of diversification. The teaching subject, learning content, learning time and learning place of the unified teaching process are becoming more and more vague. Contemporary teaching Education is undergoing an unprecedented change. The University of Liverpool has made great efforts to adapt to the development and reform of education. The extreme response has explored a research-oriented teaching approach and is at the forefront of the development of education in the world. But research as a cutting-edge educational development mode, oriented teaching needs to teach students in accordance with their aptitude in the process of reform and popularization, so as to avoid being too much. Only in this way can the fundamental problem of “who and how to train people” in the field of education be truly solved.

Research on the Reform Path of Ethnic Education in Supply-side economics Based on Educational Informatization

Ma Mei, Yu Long

2020, 39(3):  84-87. 

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Starting from the promotion of education informatization to the modernization of ethnic education, this paper analyzes the current situation of education informatization in some ethnic regions. According to the characteristics of Yunnan ethnic regions and the actual situation of multi-ethnic and mixed habitation, the author discusses the development of ethnic education informatization from the perspective of ethnic education Supply-side economics. Through on-the-spot investigation and consulting relevant materials, this paper carefully analyzes the current situation of ethnic education research and education informatization research in Yunnan, and fully considers the particularity of ethnic languages, and puts forward the path of ethnic education reform in Supply-side economics according to local conditions, so as to speed up the development of education informatization in ethnic areas in Yunnan and better offer suggestions for the development of ethnic education modernization in Yunnan.

Construction of Practical Teaching Platform of “Master Many Skills While Specializing in One” for Geographical Science

Zhao Xingguo, Tong Yan, Yang Yanjun, Zhuang Lihui

2020, 39(3):  88-93. 

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Under the dual background of application transformation and action plan for revitalizing teacher education, strengthening the construction of practical teaching platform is an important measure to promote the transformation of Geographical Science in local universities.This paper aims to cultivate compound talents of “master many skills while specializing in one”, pay attention to the integration of students’ innovative thinking ability and practical application ability. We built a practical teaching content system of“master many skills while specializing in one” for Geographical Science from the campus platforms, off campus platforms and auxiliary platforms,carried out construction path of teaching system leading, combination of software and hardware teaching platforms,teaching case support and teaching demonstration and promotion.This research provides new ideas for promoting practical teaching and improving the quality of personnel training for Geographical Science in Local Universities.

Research on the Value-added Mechanism of “Resources Turning into Stock Right,Capital Turning into Share Capital,Residents Turning into Shareholders”in China's Rural Areas

Li Jing, Li Panjie

2020, 39(3):  94-102. 

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With the attribute analysis of The“Resources Turning into Stock Right,Capital Turning into Share Capital,Residents Turning into Shareholders” reform in China's Rural and the analysis of the economic functions of the elements, the core elements of The reform are analyzed from the perspective of Marxist political economy. The value-added mechanism are analyzed.The research holds that:(1) There are three aspects of value-added effects in the reform: asset value-added, share capital value-added, and shareholder value-added. (2) The implantation of social reproduction is the prerequisite for the value-added mechanism of the reform to take effect. (3) Through the empirical analysis of the reform in rural areas, we can know that the reform can stimulate economic vitality, improve economic efficiency and generate multiplication benefits.

Demand Dependence of Economic Integration in China-ASEAN Free Trade Area(CAFTA) from the Perspective of GVC: Empirical Analysis Based on TiVA Database

Wang Min, WuYingmei, Hu Pingping

2020, 39(3):  103-111. 

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Based on the data of trade export value added (TiVA), this paper compares and discusses the internal and external demand dependence of CAFTA in the global production network by referring to the backward correlation degree of GVC and the contribution rate of final demand. The conclusion shows: At the level of export value-added dependence, the internal dependence of the CAFTA is greater than the external dependence, and the economic links in the production division of labor within the CAFTA are increasingly close. At the same time, China's position as an upstream supplier in ASEAN is steadily rising.At the level of final demand dependence, each economy relies more on the outside than on the inside of CAFTA, contributes less to the final demand market within FTA and provides less momentum for development. However, the inter-supply relationship within each economy is rising, the degree of interdependence is increasing, and the economic development within CAFTA is moving forward. Strength is expected to increase.

An Empirical Analysis of the Dynamics of New Urbanization in China ——Based on the provincial panel data model

Sun Liping,Yang Jun

2020, 39(3):  112-117. 

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This paper is based on Northam's law, combined with the practice of urbanization in China, the development of urbanization is divided into three distinct phases after reform and opening up:initial stage、middle and early stage、middle and late stag, and establish a panel data model to empirically test the development momentum of different stages of urbanization.The results show:In the initial stage of urbanization development, industrialization promotes economic growth, and the characteristics of economic growth driving urbanization are more obvious;When the development of urbanization enters the middle and early stage, the development of service industry can effectively promote the optimization of China's economic structure, and then promote the rise of urbanization.When the development of urbanization enters the middle and late stages, human capital accumulation will improve the level of China's economic service, and further promote the construction of new urbanization.Finally, this paper proposes corresponding policy recommendations.

Intangible Cultural Heritage Project of Yunnan —— Study on the Inheritance of Xinglong Gaogan Lion Dance

Yan Ruiqin, Yang Shiquan

2020, 39(3):  118-121. 

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From the perspective of sociology, this paper discusses the inheritance of the Xinglong High Bamboo Lion Dance Project. Put forward the coordinated development of government functional departments and social forces, promote the sorghum lion dance into the local campus, establish safety regulations and security systems for performances, and integrate sorghum lion dance into local sports tourism, and gradually form concrete measures such as industrialization. In order to make the High Bamboo Lion Dance project better passed down.

Sociological Interpretation of folk sports in the field of Yunnan Dai water sprinkling Festival

Ding Youpeng, Yang Wenjie

2020, 39(3):  122-124. 

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by using the methods of literature and field research, this paper interprets the sports culture phenomenon in the field of water sprinkling festival of Dai nationality in Yunnan Province. The main conclusion is that the national sports activities in the field of water sprinkling Festival contain many principles of sociology, such as the theory of gift exchange, the theory of overall presentation system, the theory of structure and function, etc. Relevant suggestions: we should take the way of both theoretical education and practice to let the Dai local knowledge live; grasp the evolution trend of modern culture to play the role of national sports in maintaining social stability.

Changes of Kun Ming JiaLize Plateau Sports Town—Enlightenment to the Construction of Sports and Leisure Towns

Wang Peng, Feng Qiang

2020, 39(3):  125-128. 

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“Kunming Jialize Plateau Sports Town” is a town developed according to the national characteristic town. It is a sports and leisure town with successful experience. Its construction experience is important for the development of sports and leisure towns in trouble. The Sports industry expert interview method and case analysis method are used to analyze the changes of the town, in order to provide successful practical experience for the characteristic towns in the development process, and promote the construction of new urbanization and sports leisure towns in China. This study found that natural endowment is the foundation of sports and leisure towns, and is a solid foundation for attracting high-quality capital injection and leading enterprises in the sports industry; high-quality capital enterprises provide sufficient construction funds for small towns, leading sports leading enterprises The direction of the development of the town; high-end sports can guarantee the characteristics of the town, avoid homogenization competition, and attract “elite residents” for the town, become an important internal cause of the revitalization of the town; competitive sports training bases and sports events with international standards The brand of the town can be upgraded, and the mass sports program can attract more people to the town. It is an important path for the town to build a sports complex from high-end sports to the public.