This paper analyzes the impact of digital economy on the integration of traditional cultural industry and tourism in Chaohu Lake area from 2012 to 2019 based on coupling coordination degree model, and introduces social network analysis method to explore the moderating effect of economic network centrality. The results show that the integration degree of traditional cultural industry and tourism is increasing in recent years; Hefei enjoys the best performance, followed by Chaohu city, Feidong county, Changfeng county, Feixi county and Lujiang county. The development of digital economy significantly promotes the integration of traditional cultural industries and tourism; the digital economy network, tourism economy network and traditional culture economy network all present "core-edge" structure, but the density is low. The Hefei municipal district is in the core position in the three networks. The centrality of the three networks positively regulates the impact of digital economy on the integration of traditional cultural industry and tourism. Finally, policy suggestions are put forward on promoting the development of digital economy, strengthening the penetration of digital technology in traditional cultural industry and tourism, and strengthening the economic ties between regions.

At present, the overall situation of the cultivation of children's physical literacy in China is not optimistic. The academic community has not formed a unified understanding of the connotation of physical literacy, and mainly focuses on school sports. The research on the impact of family environment, especially parents, on children's physical literacy is fragmented, and the relevant research needs to be strengthened. In view of this, this paper discusses the connotation and constituent elements of physical literacy through literature research, and puts forward the research hypothesis of family intergenerational transmission of children's physical literacy: Physical literacy has intergenerational transmission effect; Family upbringing, parent-child relationship and economic conditions affect the effectiveness of intergenerational transmission. Through questionnaire survey and statistical analysis, it is found that physical literacy has a significant family intergenerational transmission effect; family upbringing style, parent-child relationship and family economic conditions affect the effectiveness of intergenerational transmission of physical literacy; Among the three factors, family upbringing style and parent-child relationship have a significant positive impact, while family economic conditions have no significant impact; parents' support for their children's sports participation has a destructive impact on the intergenerational transmission of physical literacy.

The paper takes China-Chile Free Trade Zone as an example to explore how China can build a highquality free trade zone with foreign countries under the regular epidemic prevention and control, and achieve winwin cooperation. Based on the quantitative description of China-Chile Free Trade Zone, the trade complementary index is used to find that China-Chile bilateral products are highly complementary, and China mainly exports products with low added value to Chile. The epidemic has a great impact on the complementarity of Chinese exports. The synthetic control method is also adopted to prove that the construction of free trade zone has indeed driven the growth of China-Chile trade flow, affirming that the establishment of free trade zone has a positive effect on the sustainable development of China's foreign trade. Finally, according to the research results, some suggestions are put forward for the development of China爷s foreign free trade zone under regular epidemic prevention and control.

Using the development of digital economy to upgrade industry has become a key task when Anhui province is in an important stage to integrate into the Yangtze River Delta. This paper, taking Anhui province as the research object, constructs the digital economy development and industrial upgrading index system, measures the comprehensive value of the two based on the entropy weight method, and uses panel threshold regression model to study the effects of digital economy development in the whole Anhui province, southern Anhui, middle Anhui and northern Anhui on industrial upgrading from 2012 to 2019. The results show that, on the whole, both the development level of digital economy and the level of industrial upgrading are on the rise, but the regional differences are significant. Specifically, Hefei is the highest among the cities, and southern Anhui is the highest in digital economy level. The development of digital economy can significantly promote industrial upgrading, and this promoting effect has stages. Specifically, the higher the development level of digital economy, the stronger the promoting effect on industrial upgrading; but if there exist big differences between regions, the promoting effect will be reduced.

The purpose of this study was to look into the relationship between lifestyle, duty-free shop selective attributes, satisfaction, and revisit intention. The relationship between the four variables was investigated with lifestyle as the independent variable, duty-free shop selective attributes as the mediating variable, and satisfaction and revisit intention as the dependent variables, using the literature method to establish an assessment scale of lifestyle, duty-free shop selective attributes, satisfaction, and revisit intention. The survey was done on Chinese tourists visiting duty-free shops on Jeju Island, Korea, with 347 questionnaires gathered, 326 of which were valid. The study found that some lifestyle factors have a significant positive effect on duty-free shop selective attributes; duty-free shop selective attributes have a significant effect on satisfaction and revisit intention; and duty-free shop selective attributes have a partial mediating effect in the influence of lifestyle on satisfaction and revisit intention, according to PLS analysis.

The sequence of dependent random variables has been widely studied by scholars since its emergence, and the regression model plays an important role in practical application. Studying the consistency of the estimation of lower semiparametric regression model under the NSD (negatively superadditive dependent) dependent random variables sequence not only expands the application of the properties of dependent random variables, but also enriches the estimation theory of semiparametric regression mode. In this paper, the consistency of the estimation of the lower semi parametric regression model of NSD random variable sequence is obtained by using the tail cut technique of random variables and the properties of NSD random variables.

For any given simple graph G, the question of how to judge whether it has some structural properties has been explored by graph theory scholars. Because the spectrum of a graph can well reflect the structural properties of a graph and is easy for calculation, in recent years, many scholars have used the spectrum theory to study the related properties of a graph. In this paper, we first find the stability of the corresponding structural properties of graphs, then construct the corresponding closures of graphs; finally, by using the method of reductio ad absurdum, according to the signless Laplacian spectral radius of its complement, graph G with larger minimum degrees is the sufficient condition for s-connected, s-edge-connected, s-path-coverable, s-Hamiltonian, s-edge-Hamiltonian, s-Hamilton-connected or α（G）≤s.

In this paper, the consensus of time-delay multi-agent systems with leaders under disturbance of eventtriggered impulses is studied. Assuming that the impulse satisfies certain trigger rules, the consensus of time-delay multi-agent systems with leaders is studied by using Lyapunov stability theory and time-delay system stability analysis method, and the sufficient conditions for the consensus of multi-agent systems are obtained.

To improve the power of unit root test, the left adjustment method is applied to construct the Wald joint statistic and the distribution of statistic under the specific data generation process is also analyzed. Theoretical research shows that the statistic converges to the functional of Wiener process in distribution under large sample size, which is different from any of the existing statistic. Monte Carlo simulation shows two conclusions: first, the quantile of left adjusted Wald joint statistic decreases with the increase of sample size, and is less than that of corresponding unadjusted Wald joint statistic; second, the left adjusted Wald joint statistic not only has a satisfactory size level, but also owns the test power no less than that of the unadjusted Wald joint statistic. The results of this research can help improve the unit root joint test method and provide a new test method for empirical research, which enriches the theory of unit root test process.

To reduce the impact of supervised learning requiring a large amount of high -quality labeled data, a semi-supervised pedestrian re -identification method based on regularization constraint is proposed. This method constructs a dual -model network with the same initialization parameters, namely the teacher network and the student network. During the training process, some labeled data and a large amount of unlabeled data are randomly used as the input of the dual model, and the parameters of the dual model network are constrained by regularization, so that the output results of the same labeled or unlabeled input data remain consistent. On this basis, the teacher network uses the stochastic gradient descent method to optimize the required parameters, and the student network uses the parameters optimized by the teacher network to perform the weighted moving average iteration to obtain the required parameters. The experimental results show that the Rank-1 and mAP of the proposed method on the market1501 dataset with partial labels and a large number of unlabeled data sets are improved compared with the Rank-1 and mAP of the original ABD-Net method, which proves that this algorithm is effective by learning with a small number of labels.

With the development of cloud computing, Internet of things and big data technology, the cache technology has been introduced into the modern Web system because of the huge amount of data and high concurrency, which reduces the load pressure on the server end caused by the direct access to the relational database, improves the response efficiency of the database server and reduces the delay of the browser. Redis is widely used in modern Web systems because of its high-performance distributed memory cache technology. This paper will analyze the reasons for the high performance of Redis through the experimental data, and put forward corresponding strategies for Redis performance optimization from different angles based on experimental data, so as to better improve Redis user experience.

Rapid detection of sulphonamide antibiotic contamination in the environment is important for water environment monitoring and management. To fabricate carbon quantum dots based fluorescent molecularly imprinted sensor（CQDs-MIP） with specific recognition ability for sulfamethazine, nitrogen-doped carbon quantum dots, 3-aminopropyltriethoxysilane, ethylene glycol dimethacrylate and sulfamethazine were used as the fluorescence source, functional monomer, cross-linker and template molecule respectively. The effects of functional monomer addition, solvent type and cross-linker type on the performance of CQDs-MIP were investigated by adsorption experiments. The experimental results showed that the adsorption process of CQDs-MIP on sulfamethazine was in accordance with the Langmuir adsorption isotherm model and the second-order kinetic equation, and showed high selectivity for sulfamethazine with the selectivity coefficients of 2.28 and 3.02 with respect to sulfadiazine and sulfadimethazine, respectively. The linear range of CQDs-MIP for sulfamethazine was 2~100 mg·L^-1 with a linear correlation coefficient of R² = 0.9972; CQDs-MIP has the ability to detect sulfamethazine rapidly and sensitively.

Aiming at the situation that label distribution learning involves the feature correlation information of samples, and data may have abnormal and noise values, a model is established by combining the self-representation properties of samples and correlation between sample and label, and a label distribution learning algorithm (LRNSR-LDL) based on joint linear reconstruction and non-negative sparse representation is proposed. Firstly, the self-representation attribute of features is used to establish the linear relationship between the sample feature spaces, and obtain the feature similarity space after linear reconstruction; Then, using the correlation between feature and label, the label distribution is represented by the feature similarity space through non-negative sparse matrix decomposition, and optimization model is established with the loss function respectively; Finally, the l_2,1-norm constraint is introduced to reduce the adverse effects of outliers and increase the model's generalization ability. The proposed algorithm is compared with three existing label distribution learning algorithms on six real data sets, and five similarity and distance indices are respectively used for evaluation. The final experimental results show that the proposed LRNSR-LDL algorithm has its advantages.

By comparing the topological characteristics of various DC/DC converters, an isolated bidirectio nal bridge DC/DC converter （BDC） with high power supply and transformer utilization and high power d ensity is selected; in order to improve the voltage gain and energy transmission efficiency, the resonant t ype is improved. BDC; in order to achieve consistent bidirectional operating characteristics and soft switc hing function, it is further improved to CLLC resonant BDC; in order to achieve constant voltage gain a nd transmission efficiency under frequency offset, a frequency tracking CLLC resonant BDC is finally de signed. The simulation results show that the frequency-tracking CLLC resonant BDC designed in this pap er can maintain high voltage gain and energy transmission efficiency under a large frequency range offset, no matter it is forward transmission or reverse transmission, and the bidirectional transmission characteris tics are basically Consistent.

Strengthening public sports services for the elderly in rural areas is an important step in the new era of China's national fitness program to achieve the healthy China strategy. The primary task is to establish a scientific, systematic, reasonable and effective evaluation index system of public service governance for the elderly in rural areas, so as to guide the construction of public service for the elderly in rural areas and improve the validity of public service governance. According to the scientific, systematic and rational principles for indicators selection and system construction, taking WSR-AHP model as the structural framework, the evaluation index system is constructed mainly through literature method, Delphi method, analytic hierarchy process and mathematical statistical analysis. Finally, the evaluation index system consisting of 3 first-level indexes, 9 second-level indexes and 46 third-level indexes is established after multiple revisions and tests. The evaluation indexes established in this paper can basically reflect the various factors of sports public service governance for the elderly in rural areas, and provide reference for China's sports public service governance, rural sports construction, and the elderly sports public service supply direction selection.

Using case analysis and logical analysis, this paper deeply analyzes the theoretical basis and advantages and disadvantages of different operation modes of community fitness centers, and probes into the experience and lessons of the operation modes of community fitness centers in China. Through research and investigation, we reach conclusions and put forward the optimization path: Establishing incentive mechanism; optimizing the construction of incentive supporting mechanism; improving the court comprehensive evaluation and assessment mechanism; constructing and improving supervisory agencies; efficient management of regulatory content; diversified design of regulatory forms. The research has important contribution and practical significance to the design optimization and improvement of the operation mode of fitness centers in China, the improvement of national fitness infrastructure service system, the promotion of the construction of a sports power at the present stage, the promotion of the health development of the whole population and the strategic construction of healthy China.

Fencing, as a fashion sport with high requirements, has prospered mainly in economically developed areas. It is in its initial stage in Anhui Province, and there are few related researches. By means of questionnaire, interview and filed survey, this paper investigates 7 youth fencing clubs in Anhui Province. The results show that fencing in Anhui Province has developed rapidly in recent years, but there are problems including lacking general awareness, low comprehensive quality of coaches and inadequate facilities. Measures such as enhancing publicity, strengthening the training of coaches, improving infrastructure, and optimizing management mode can be expected to solve the current problems of fencing development in Anhui Province and promote its sustainable development.

The teaching content of specialty courses is the carrier of talent training objectives, and the theoretical teaching and practical teaching of specialty courses should have the teaching design suitable for the specialty. Therefore, the canvas of teaching knowledge points, principle simulation and incremental development are put forward to realize the establishment of teaching content, theoretical teaching design and practical teaching design for specialty courses. Firstly, canvas is used as a tool to establish the teaching content for specialty courses and their prerequisite courses; the teaching content fully reflects the objectives of talent training; specialty courses have all the knowledge foundation acquired by prerequisite courses, which fundamentally guarantees the teaching achievement and realizes the goal orientation of engineering education. Secondly, the grouping task in theoretical teaching simulates the working principle of the IoT （Internet of Things）subsystem corresponding to each specialized course. The simulation process promotes the internalization of knowledge, and the simulation effect presents teaching problems in a comprehensive way, which makes the continuous improvement of engineering education more targeted. Finally, the practical teaching decomposes verification-type projects, and gradually develops the IoT subsystem corresponding to each specialty course from the core to the outer layer, which reduces the difficulty caused by non-technical factors, guides students to deeply participate in the practice project, and highlights the student-centered engineering education. Guided by the concept of engineering education, strengthening the construction of specialty courses can help improve the quality of talent training.

Narcissistic personality is an important factor that affects employees' job performance. Analyzing the relationship between narcissism and job performance has a profound impact on the recruitment, selection, assessment, and promotion in the organization. Through combing and summarizing relevant literature, this paper constructs the conceptual framework of narcissism忆s influence on job performance, and analyzes the occurrence path of narcissistic personality's influence on job performance. It is found that narcissism has a more prominent negative impact on job performance, but it will also play a positive role in certain situations. The psychological process and characteristics of narcissists, and specific situations are the main factors affecting the relationship between them. Based on the research conclusion, narcissism and the mechanism of narcissism' s influence are of great help to effective intervention by the management, and it is necessary to continue the research in this field in the future.

By using the research methods of literature review and field interview, this paper deeply analyzes the physical education internship under the accreditation of teacher-training majors in colleges and universities in China. By combining the development orientation of teacher-training majors, based on the development characteristics of physical education majors, and aiming at the actual dilemmas existing in physical education internship, such as ineffectiveness of internship links, lack of standardization of practice and study links, unclear training objectives, and lack of reasonable and effective quality monitoring and evaluation system, this paper proposes to optimize the development strategy of physical education internship under the accreditation of teacher-training majors, pay attention to the close connection between all links of education internship and the integration of theory and practice, ensure the effective development of education internship, strengthen the quality monitoring and evaluation system of education internship, establish a multi-faceted cooperation system, and jointly help improve education internship. The study aims provide reference for the reform of physical education internship under the accreditation of teachertraining majors.

The national fitness plan and the ideological and political construction of physical education courses in colleges and universities have the same goal of educating people, which is promoting people忆s health and their allround development. This article studies the value combination of national fitness and ideological and political education in college PE courses by the methods of literature review and logical analysis, analyzes the value orientation of ideological and political education in college PE courses from the perspective of national fitness, and discusses the problems including lack of mass foundation, absence of a double-promotion synergy mechanism, and the idea of lifelong sports has not yet been popularized. Combined with the value attribution and outstanding problems found in the research, it is suggested that the ideological and political construction of college PE courses should be carried out from the aspects of socializing the ideological and political system of college PE courses, establishing the coordination mechanism between college physical education and national fitness, and extending the concept of college physical education from "health first" to "lifelong sports".