Table of Content

26 November 2023, Volume 42 Issue 6

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Effect of Boundary Conditions on Thermalization of Classical Lattices with Asymmetric Interactions

ZHANG Xuan, HAN Yuqi, HE Dahai

2023, 42(6):  1-7. 

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The influence of different boundary conditions on thermalization of one-dimensional classical nonlinear lattice is studied. The study shows that the scaling behavior of thermalization time for lattices with the asymmetric interaction potential exhibits significant differences under different boundary conditions, which is unlike that for lattices of the symmetric potential by comparing the thermalization times of the FPUT-like lattices under free and fixed boundary conditions respectively. Deviations from the predictions of wave turbulence theory during the thermalization process of the FPUT-α model with free boundary condition are observed, but the distinct metastable state during the thermalization process of the FPUT-α-β model with free boundary condition is not observed. These findings suggest that the choice of boundary conditions plays an important role in numerical simulations of thermalization in lattices with asymmetric interactions.

Effect of Surface Roughness on Lubrication Performance of Environment-friendly Lubricants

CAI Fada, PENG Wenzhu

2023, 42(6):  8-14. 

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The effects of SiO₂ surface roughness on the wettability and lubrication properties of environment-friendly lubricants squalane and pentaerythritol oleate were investigated by contact angle measuring instrument and micro-friction and wear testing machine. The results showed that with the increase of the surface roughness, the larger the contact angle between the lubricating liquid and the sample surface, the worse the wetting effect was. In squalane lubrication medium, the rougher the surface of the sample, the larger the friction coefficient between SiO₂-GCr15 is, and the bigger the wear volume of the sample. Besides, the friction coefficient between the friction pairs first increased and then slowly decreased with time, and tended to be stable finally. In pentathritol oleate medium, with the increase of the specimen roughness, the friction coefficient between the friction pairs turned into smaller after 12 minutes. As the roughness of the specimen increased, the wear volume of the specimen surface also decreased.

Effects of Moisture Content and Dry Density on Shear Strength of Remolded Red Clay

ZHANG Ji

2023, 42(6):  15-20. 

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This study investigates the shear strength characteristics of Wuhan remolded red clay and examines the influence of dry density and moisture content on shear strength of unsaturated remolded red clay with direct shear test. The experimental results show that under the condition of the dry density being 1.4g/cm³, with the increases of moisture content, the cohesive force of the remolded red clay increases first and then decreases, and when the water content is 27%, the cohesive force is the highest with the increases of moisture content, the internal friction angle and fluctuates within a small range first and then when the moisture content exceeds 30%, the internal friction angle decreases sharply; under the condition of moisture content being 25%, with the increases of dry density, the shear strength, cohesion and internal friction angle of red clay increases linearly, and the stress-strain relationship changes from a weakly softening type to a strong softening type.

Investigation on Diversity of Grasshopper Species in Qujing

LI Wenbo, Nawaz Haider BASHIR, QI Lemoge, DU Guochuan, LIU Tianjie, LI Xiaohua, GUO Xiaoqiong, LI qiang

2023, 42(6):  21-25. 

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In order to understand the insect resources of Acridoidea in Qujing , Yunnan , the species diversity and distribution of local locusts are investigated by five-point random sampling method and traditional taxonomy. Four hundred specimens belonging to 19 species, 16 genera and 7 families are collected and identified. Among them, Oedipodidae has the largest number of genera and species (7 genera and 7 species), followed by Pyrgomorphidae (1 genera and 3 species) , Arcypteridae (2 genera and 3 species), and Acrididae and Chrotogonidae (1 genera and 1 species respectively). The results of diversity analysis show that the richness, Shannon-Wiener diversity index, evenness and dominance index of grasshoppers in the farms of Malong District are the highest. From the perspective of species distribution, Atractomorpha sinensis and Trilophidia annulata are the most widely distributed. From the distribution point of view, Malong District farm has the most abundant species (17 species). The results show that the diversity and distribution characteristics of locust species in Qujing are closely related to habitat vegetation types providing a basis for the resource utilization, prediction and comprehensive control of local locusts.

Comparative Analysis of Organ Index of Wuliangshan Silky Fowl

LI Zhengtian, SHEN Zhichao, TANG Xuefeng, YUAN Hemei

2023, 42(6):  26-31. 

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Internal organs are the functional organs of the body that play an important role in digestion and absorption of various nutrients and body growth performance and development of poultry. The organ indexes of 40 Wuliangshan black-bone chickens at the age of five months are compared with the internal organs of hens. The results showed significantly higher live body weight, lungs, heart, gonads and liver weight of cocks than those of hens(P<0.01). Muscle stomach weight is significantly higher than that of hens(P<0.05). The gonads, lungs and heart weight indexes of cocks are significantly higher than those of hens (P<0.05). The liver and gastric indices are significantly lower than those of hens (P<0.05). Both heart and gonads weight indexes are significantly positively correlated with live weight and the weight indexes of heart, kidneys, lungs and glandular stomach are significantly positively correlated with live weight (P<0.01). Moreover, liver and adeno gastric indices are significantly positively correlated with live weight (P<0.05). The weight and organs indexes of internal organs reflect the function of animal body to a certain extent, and have important guiding significance for metabolic activity and production practices.

Extraction Process Optimization and Antioxidant Properties in vitro of Polyphenol from Russula virescens

ZHAO Hongyan, ZHANG Yaguan

2023, 42(6):  32-37. 

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This paper aims to optimize the extraction technology and study the antioxidant activity of polyphenols from Russula viresce.Polyphenols were extracted from Russula virescens with ethanol as extraction solvent by using ultrasonic extraction method. The optimum extraction condition of Russula virescens polyphenols was determined by single-factor and orthogonal test.The results showed that the optimum extraction conditions were obtained as follows: ethanol volume fraction 30%, solid-liquid ratio 1:40 (g/mL) and extraction time 50 min. Under these optimized conditions, the average extraction rate of polyphenols was 9.81mg/g. The hydroxyl radical and DPPH radical scavenging ratio with polyphenol concentration have notable positive correlation respectively. The experiment results showed that the Russula virescens polyphenol had good antioxidant properties.

A Path Planning Algorithm for Unmanned Aerial Vehicle Collaborative Search in Earthquake Scenarios

SHEN Xiujuan, CAO Yuanli, WEI Lian, HU Die

2023, 42(6):  38-44. 

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For earthquake scenarios, the article proposes a path planning algorithm for multi drone collaborative search. This method is an improved path search optimization algorithm based on depth first search and spanning tree ideas. The algorithm is divided into two steps. The first step can obtain all reasonable search paths of UAV under the specified step constraint. The second step can obtain the specified path combination number with high search probability under the condition of the specified number of UAVs. The calculation results show that the proposed path search algorithm guarantees the exhaustiveness and uniqueness of the path. Among the search path combinations satisfying the constraint conditions, the route with the highest target probability is found to mainly cover the densely populated residential areas, which is consistent with the reality. Moreover, through experimental simulation, the UAV can return more disaster site information by taking photos within the specified time, providing more accurate direction for the search and rescue team to make rescue plans.

Design and Implementation of Robot for Tree-barrier Cleaning

ZHENG Xiaobin

2023, 42(6):  45-52. 

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Tall trees and complex terrain in complex environmental regions may cause electricity danger, but traditional methods for manually clearing tree barriers easily involve safety accidents and the robots developed in our country have the problems of unstable air attitude control and data transmission. The aerial robot for clearing tree barriers is designed and implemented to solve the above problems. The structure of the robot mainly includes multi-rotor UAV, control system, remote monitoring system, communication system and tool device. The dynamics model of aerial robot is established by determining the relationship between ground coordinate system and UAV coordinate system. Considering the influence of environment and other factors on the data collected by aerial robot sensors, a sensor data fusion algorithm is established to process the data collected by sensors. The attitude controller of aerial robot is designed by using PID (Proportion Integral Differential) control method. The attitude control tests and tree-barrier cleaning tests are carried out to verify the performance of the tree-barrier clearing aerial robot. The test results show that the response time of the robot attitude control is short, with the shortest up to 1.2s. When cleaning the tree barrier, the maximum diameter of the tree barriers can be cleaned up to 4cm, and the maximum cutting time is 3s.

The Interaction between Population Aging, Industrial Structure Upgrading and High-quality Economic Development in Western China Based on PVAR Model

SUN Liping, ZHOU Bingrou

2023, 42(6):  53-62. 

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This paper discusses the long-term dynamic relationship between population aging, industrial structure upgrading and high-quality economic development by establishing a PVAR model by taking the panel data of western China from 2002 to 2021 as an example. Based on Granger causality test, GMM estimation, impulse response function and variance decomposition results, the study show that population aging has a positive effect on high-quality economic development in the short term, but a negative impact in the long term; the aging population has a gradually weakening positive impact on the upgrading of industrial structure; the upgrading of industrial structure has a stable and lasting positive impact on high-quality economic development; and from the result of variance decomposition, the contribution rate of industrial structure upgrading to high-quality economic development accounts for 18.4%, and the contribution rate of population aging to industrial structure upgrading reaches 19.9%. According to the research conclusion, local governments should actively respond to the long-term negative impact of population aging, constantly improve the level of human capital, effectively promote the transformation and upgrading of regional industries, and gradually achieve high-quality economic development.

The Impact of Green Tax System on Liquor Manufacturing Industry under the Carbon Peaking and Carbon Neutrality Goals and Countermeasures

HE Gang, LI Lei

2023, 42(6):  63-68. 

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Improving the green tax system is an important measure to achieve the carbon peaking and carbon neutrality goals. Based on the theory of externalities, taxation theory and price elasticity theory, this paper analyzes the mechanism and path of the impact of carbon emission release constraints on the liquor manufacturing industry through the green tax system, and takes Sichuan Province, a major province in the liquor industry, as an example for empirical analysis, so as to provide a theoretical basis for the green development of the liquor industry under the carbon peaking and carbon neutrality goals from the theoretical and practical levels.The results show that the liquor industry is facing challenges brought by carbon emission constraints at this stage, and the green tax system is conducive to promoting the low-carbon transformation of the liquor industry. The green tax system mainly promotes the low-carbon transformation of the liquor industry by increasing R&D investment and optimizing the industry structure. The green tax system will increase the operating costs of liquor enterprises, change the consumption structure of liquor, and bring greater challenges to small and micro enterprises. In this regard, it is recommended to improve industrial policies to protect the development of small and micro enterprises, formulate reasonable tax rates to reduce the impact on the consumption structure of liquor, and encourage liquor enterprises to increase investment in research and development to accelerate the low-carbon transformation of the industry.

Influence of Digital Economy on Manufacturing Industry Upgrading in Yangtze River Delta Region

HU Xiaomei, LI Jie, CHEN Ding , LI Dong

2023, 42(6):  69-74. 

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Digital economy is an important driving force for manufacturing industry upgrading. Based on the panel data of 41 prefecture-level cities in the Yangtze River Delta region from 2010 to 2019, the level of transformation and upgrading of manufacturing industry and the degree of development of digital economy in the Yangtze River Delta were measured separately using the entropy weight method, and then the non-linear influence of digital economy development on the transformation and upgrading of manufacturing industry in the Yangtze River Delta region was analyzed empirically with the help of the panel threshold model. The results show that the digital development level and the transformation and upgrading level of manufacturing industry in the Yangtze River Delta region generally show an upward trend; the digital economy shows a significant positive influence on the rapid development of manufacturing industry and there is a double threshold effect, when the digital economy development is at a low level,which shows an inhibitory effect on the upgrading of manufacturing industry. When the digital economy crosses the first threshold, it plays the greatest role in promoting the upgrading of manufacturing industry, however, when the digital economy crosses the second threshold, its role in promoting the upgrading of manufacturing industry will be weakened.

Temporal and Spatial Change of Land Use in Luliang in Qujing during Recent 20 Years

LIU Yan, LIU Fenglian

2023, 42(6):  75-82. 

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Based on the land use and cover data of Luliang in 2000, 2010 and 2020, the temporal and spatial changes of land use in Luliang in recent 20 years are studied by using land use dynamic attitude, land use transfer matrix and standard deviation ellipse. The results show that cultivated land, grassland and forest land are the main land use types in Luliang and the area of grassland, cultivated land, forest land and unused land decreased, while the area of construction land and water area increased, and the area of construction land increased the most; the comprehensive dynamic attitude of land use is small, the change of land use is gentle on the whole, and the increase of construction land is fast; the mutual transfer of cultivated land, grassland and forest land is large, and the expansion of construction land is mainly realized by occupying cultivated land in the central dam area; and the overall distribution of construction land was northeast to southwest, and the change of center of gravity was not obvious. The spatial aggregation of construction land was the strongest in 2000.

Rational Layout of Urban Ecological Recreation Space from the Perspective of Spatial Justice: A Case Study of Qilin District in Qujing

ZHU Miaoyuan, HUA Honglian, SUN Qiuyan, TANG Enping

2023, 42(6):  83-91. 

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The contradiction between the increasing demand for ecological recreation among residents and the supply of urban ecological recreation space becomes increasingly prominent. This paper selects coverage rate of ecological recreation space service radius, residents' leisure time, leisure distance, and residents' recreation satisfaction as indicators, and uses GIS network analysis and questionnaire survey to explore the rationality of its ecological recreation space layout from the perspective of spatial justice, the logical starting point of "demand orientation" of residents' ecological recreation services by taking Qilin District in Qujing in Yunnan Province as an example. The results show that the supply and demand of ecological recreation space in the main city of Qilin District does not match, showing a surplus at the edge and a shortage at the center; poor transportation accessibility limits the frequency of residents visiting ecological recreational spaces, affecting their service function radiation and release; recreational behavior is related to the supply of ecological recreational space types, and the differences in recreational behavior presented are limited by the supply of ecological recreational space types; 70% residents are satisfied with the basic services and facilities within the ecological recreational space, but 82% are dissatisfied with the rationality of the layout of the ecological recreational space; and the types of services provided by various ecological recreational spaces are relatively single, and there is a situation of overlapping recreational space services.

Construction and Practice of Integrated Virtual Simulation for Characteristic Plant Konjac

HAN Lihong, TIAN Xuelian, GAO Yong, ZHANG Yanan, GUO Lihong, LIU Chao

2023, 42(6):  92-98. 

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A synthesized experiment for classification, breeding and pathogenic microorganism analysis of Konjac is constructed by using virtual simulation technology to improve students' creative, research-based learning, comprehensive practical abilities and awareness of ecological civilization and combining with teachers' scientific research projects, research achievements and academic frontiers. Taking konjac, a local economic plant, as the research object, observation, experiment, analysis and research are integrated to reproduce the whole process through four modules and 36 interactive links. The process of teaching mainly includes field investigation, classification of Konjac, artificial pollination, and pathogen identification. The student-centered teaching is based on experimental preview, online virtual, entity learning, after-class expansion, formative evaluation and teaching introspection. The study supplies guidelines for the model of mixed teaching with combination of virtual-reality, online-offline, and fosters the professional talents for local economic development and protection, development and utilization of plant resources.

Characteristics and Guarantee Mechanism of Personalized Learning under the Background of Intelligent Education

FAN Wei, SUN Rongqian, YANG Xia

2023, 42(6):  99-106. 

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The era of intelligent education provides unlimited possibilities for learners to realize personalized learning. The rapid development of intelligent technology and the continuous optimization of intelligent education products empower personalized learning. After exploring the essence of personalized learning from its historical backtracking and basic connotation, this paper holds that under the current background of intelligent education, the characteristics of personalized learning process are predictability of learning analysis, pertinence of resource push, accurate learning diagnosis and scientific learning evaluation. Establishing a standardized personalized learning system, creating complete personalized learning facilities, building a collaborative community of personalized learning, and exploring efficient personalized learning paths will further realize the empowerment of intelligent technology to personalized learning in the future.

A Brief Analysis of Sports Culture in the Five Lancang-Mekong Countries

WANG Peng, PENG Jian

2023, 42(6):  107-112. 

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Since its inception, the Lancang-Mekong Cooperation has become increasingly active in the China-Asean region, the cooperation mechanism is becoming more mature, and considerable achievements have been made in the five priority areas of cooperation. As Lancang-Mekong cooperation has moved from a period of rapid expansion to a period of comprehensive development, and the cooperation framework has evolved from "3+5" to "3+5+X", it is urgent to explore new areas of cooperation in light of the growing development needs of Lancang-Mekong countries. The study takes the sports culture of Thailand, Vietnam, Cambodia, Myanmar and Laos ( the Five Lancang-Mekong countries) as the starting point, sorts out the characteristics of national culture, the history of national sports events and the development level of modern competitive sports of each country, and provides some theoretical basis for sports culture exchanges and cooperation among Lancang-Mekong countries to facilitate the development of emerging areas of cooperation within the Lancang-Mekong Cooperation framework.

Research on Culture Exchange of Traditional Sports of Cross-border Ethnic between China and Myanmar from a Contemporary Perspective

CUN Yaling, LI Dongying, WANG Shuo

2023, 42(6):  113-117. 

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The traditional sports culture of cross-border ethnic groups has the prominent social value in the local population community and national strategy due to the particularity of the population and location. The internal law of cross-border communication and interaction of traditional sports culture of cross-border ethnic groups are analyzed in the paper based on the traditional sports culture of cross-border ethnic minorities in China and Myanmar through the methods of literature, field investigation and logical analysis to explore its role in the national "One Belt, One Road" initiative and Yunnan's construction of Windows to South Asia and Southeast Asia from the contemporary perspective.The results show that the cross-border ethnic traditional sports culture exchange between China and Myanmar has opened up a new way for the construction of new rural areas on the border of China, enhanced people-to-people ties, strengthened good-neighborly and friendly relations between the two countries, promoted the development of economy in border areas, and the soft power of border culture was enhanced, thus it has effectively safeguarded national security.

Problem and Countermeasure of Sports Exchange and Cooperation between Universities in Southwest China and ASEAN

XU Ximei

2023, 42(6):  118-122. 

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The higher education is the mainstream of education cooperation between China and ASEAN countries. Studying the cooperation between higher education in Southwest China and ASEAN countries is conducive to collaborative development and talent sharing, deepening the internationalization of education, and strengthening the China ASEAN community with a shared future. Sports have unique advantages in international cooperation and exchange. Starting from the discipline of higher education sports, this study uses methods such as literature review, comparative analysis, and interviews to study the mechanism, content, and issues of sports exchange and cooperation between universities in Southwest China and ASEAN countries. Based on the theory of cross-border cooperation, the study proposes to integrate the advantages of regional university resources, establish a China-ASEAN sports and cultural exchange management and guarantee institution, and establish a long-term mechanism such as the China-ASEAN sports and cultural database. The study will provide reference for deepening the breadth and depth of sports exchange and cooperation between both universities, and improve the scale and quality of cooperation and exchange.

Optimization Strategy for Crossing China-Myanmar Border Marathon from the Perspective of the" Belt and Road"

WU Minglin , FENG Qiang

2023, 42(6):  123-128. 

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The China-Myanmar border marathon is of practical significance for promoting the establishment of China-Myanmar economic corridor, carrying forward the traditional Pauk-phaw friendship and realizing the good-neighborly, friendly and harmonious development of the two countries. By using the methods of literature, field investigation and logical analysis, this paper studies the history, events, scale, awards and guarantee of crossing China-Myanmar border marathon from the perspective of the "Belt and Road ". The study claims that the event is to expand the space of China-Myanmar exchange and create a good political environment in the border area, build the image of sports tourism city and drive the economic development of border areas, carry forward ethnic culture in border areas, and promote regional cultural identity and other three-dimensional values. Comprehensively expanding competition cooperation space is to promote economic development in the border areas and the integration of marathon and national culture and establish a "people-centered" concept of health.