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An alternative to the one-child policy in China 中国独生子女政策的替代方案
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241109
Keyin Wang, Yuli Zhou
{"title":"An alternative to the one-child policy in China","authors":"Keyin Wang, Yuli Zhou","doi":"10.54254/2753-8818/31/20241109","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241109","url":null,"abstract":"In recent years, the problem of ageing in the country has become increasingly serious. In addition, with the number of newborn babies dropping sharply, social pressure increasing and the number of young workers seriously insufficient, the problem of old age has become a severe test before people and is gradually affecting social and economic development. Between 2005 and 2021, the proportion of Chinas total population aged 60 and over will rise from 11.1% to 12.5%, and the old-age dependency coefficient from 10.69% to 11.60%. In order to alleviate this predicament, the State has introduced a new policy aimed at providing better old-age protection for the elderly and improving their living standards. This new policy not only helps to solve the problem of old age, but also reduces the burden of the only child, and should be based on Chinas national conditions to establish an old age system with Chinese characteristics, so that old age is no longer difficult. Chinas future population will be very different from before.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"41 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140260364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Using Bernoulli analysis in horse racing game 在赛马游戏中使用伯努利分析法
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241016
Yiqian Zhang
{"title":"Using Bernoulli analysis in horse racing game","authors":"Yiqian Zhang","doi":"10.54254/2753-8818/31/20241016","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241016","url":null,"abstract":"Horse racing is very popular in East Asia, especially in Hong Kong and Japan. But whether there is a specific way to win in this kind of gambling game is something that many people are curious about. There are many statistical analyzes in the field of mathematics that deal specifically with various forms of gambling. Many researchers also hope to use mathematics to calculate the winning method of horse racing. The aim of this article is to obtain, through mathematical analysis, the correlation between the effect of the weight of the horse on the outcome of a race in a horse race, under the influence of different distances. In the article, purely linear relationships and Bernoulli analysis were used to determine the results, and then Bernoulli analysis was used to obtain the relationship between the weight of the horse and the final result. In the plotting process, I used pythons PyMC3 library to help construct the mathematical model, and jupyter notebook to make the data more intuitive to show.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"36 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140258442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analyzing Microsoft stock price trends, factors, and market efficiency for optimal investment strategies 分析微软股票价格趋势、因素和市场效率，以制定最佳投资策略
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241117
Hengpu Zhao
{"title":"Analyzing Microsoft stock price trends, factors, and market efficiency for optimal investment strategies","authors":"Hengpu Zhao","doi":"10.54254/2753-8818/31/20241117","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241117","url":null,"abstract":"Microsoft, one of the tech giants, has seen significant fluctuations in its stock prices in recent years. This article delves into an analytical study of these changes using data sourced from Yahoo Finance. The background for this research stems from the desire to understand the intricacies of stock price movements and the factors influencing them, especially for prominent companies like Microsoft that have a vast impact on global markets. The methodology adopted for this study is the technical approach, where the moving average is calculated to determine the stocks trend. Moving averages are a cornerstone of technical analysis and can provide insights into potential buy and sell signals. By employing this method, the research aims to validate the appropriateness of certain investment strategies based on historical data. The primary objective of the study is not just to chart the course of the stocks price but to delve deeper into the causative factors behind its movement. Various external and internal factors can influence stock prices, from global economic trends to company-specific news. By analyzing these factors, the research also seeks to test the efficiency of the market, a long-debated topic among economists and investors. In conclusion, while past data can offer insights, the stock markets volatile nature demands continuous adaptation of investment strategies. The findings from this study can serve as a foundation for developing more refined prediction tools and investment tactics. Future studies might consider integrating more sophisticated models or incorporating other predictive variables to enhance accuracy and investment outcomes.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"49 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140259051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Application of ARIMA agorithm and genetic algorithm based on MATLAB language in finance 基于 MATLAB 语言的 ARIMA 算法和遗传算法在金融领域的应用
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241156
Sihao Wu
{"title":"Application of ARIMA agorithm and genetic algorithm based on MATLAB language in finance","authors":"Sihao Wu","doi":"10.54254/2753-8818/31/20241156","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241156","url":null,"abstract":"The price changes of bitcoin and gold are frequent, as observed in previous studies, and market participants can base their daily investment plans on historical data. Market traders can maximise their investment returns by buying low and selling high on volatile assets based on the day's market conditions, as markets fluctuate every day. Gold and bitcoin are two of the most common volatile investments. In this project, we are trying create an algorithm of high degree of integration which can provide advice to traders before they made their decisions. We used ARIMA algorithm based on the Genetic Algorithm to predict the data and let the algorithm to make based on the predicted data. The complete code could be seen in appendix. The codes were mostly based on MATLAB language, for which it integrated the features of simple and easy to get started; dispatchable sensitivity; adaptable and reliable. Which allows the traders to use simple operations to get reliable and visualizable results. Which can let the traders to have the opportunity to get suggestions on when they should trade.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140260125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modelling spatial point patterns of Asian Giant Hornets occurrences 亚洲大黄蜂出现的空间点模式建模
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241140
B. Che
{"title":"Modelling spatial point patterns of Asian Giant Hornets occurrences","authors":"B. Che","doi":"10.54254/2753-8818/31/20241140","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241140","url":null,"abstract":"This study explores statistical methods for modelling the spatial patterns of Asian giant hornets using sighting records in the Republic of Korea from 2008 to 2013. The focus is on simulating the spatial distribution of hornets, with a key aspect being the statistical inference of their intensity. Gaussian kernel-smoothing estimation is utilized to model the hornets intensity based on sighting records, which also transforms the occurrences of honeybees, a primary prey of the hornets, into a covariate. Results show a significant dependency of hornets intensity on honeybees intensity, with a calculated probability that a hornet sighting location has higher honeybee intensity than a random location. By this finding, the parametric modelling of the hornets spatial intensity is applied with the covariate of honeybees in each year, with the basic inhomogeneous Poisson point process along with the log-linear model. The model is refined for each year using backward stepwise selection based on the Akaike Information Criteria. Model validation confirms the Poisson process assumption and shows promising results with raw residuals against honeybee intensity. The analysis demonstrates that the spatial pattern modelling method employed is both sensible and valid.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"11 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140260273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Current study on PID control method with optimized BP neural network based on particle swarm optimization 基于粒子群优化的 BP 神经网络 PID 控制方法的当前研究
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241088
Han Wang
{"title":"Current study on PID control method with optimized BP neural network based on particle swarm optimization","authors":"Han Wang","doi":"10.54254/2753-8818/31/20241088","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241088","url":null,"abstract":"At present, robots show great application value in various industries, and the progress of the industry constantly puts forward higher requirements for the performance of robots, and robot control is an important part of robot application. It is difficult for the traditional PID controller to implement online tuning when it is faced with actual objects. Consequently, the neural network algorithm has been included into robot control methods in recent years; the PID controller based on BP neural network is the subject of this research. This study presents the current state of research, the basic concept behind BP neural networks, how they are used in controller design, and how to optimize the PID parameters of BP neural networks using a particle swarm optimization method. To increase system stability, the neural network is coupled with a PID controller. The adaptive learning capability of the neural network is utilized to modify PID control parameters online in real time. Targeting the trouble that it slips into a local minimum easily during the BP-PID self-learning process and the refined PSO algorithm is used to improve it. It makes sure that the BP-PID system converges to the global optimal solution. The proposed method can effectively improve the system control accuracy and control stability.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"2 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140258593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The influence of the Sun, Moon and Earth Tides 太阳、月亮和地球潮汐的影响
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241155
Yongkang Su
{"title":"The influence of the Sun, Moon and Earth Tides","authors":"Yongkang Su","doi":"10.54254/2753-8818/31/20241155","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241155","url":null,"abstract":"Tidal phenomena, a ubiquitous spectacle along coastlines, have captivated human curiosity for centuries. It can be involved in some small activities like fishing on the sea. Also, some big activities like the prediction of the position of the Earth should take the consideration of tides. This paper is aimed to have a summary of the formation and the principles of tides. Then, according to the essential theory, some applications are discussed based on the fields of astrology, geography, and clean energy. The principles of these applications are summarized and concluded into some useful information. The information that people derive from tides is a significant amount which can help humans make more efficient methods for the prediction of some phenomena like earthquakes and the movement of moons. As a result, The value of tides is still a potential topic that can help human progress in human beings.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140258721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Misalignment of jet, orbital plane, and accretion disk observed in black hole binaries 在黑洞双星中观测到的喷流、轨道面和吸积盘的错位
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241148
Jiawei Qiu
{"title":"Misalignment of jet, orbital plane, and accretion disk observed in black hole binaries","authors":"Jiawei Qiu","doi":"10.54254/2753-8818/31/20241148","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241148","url":null,"abstract":"Black holes are interesting objects and prove to be the leading edge of testing and verifying of our understandings in gravity. Among some of the most sought after quantities is the spin of the black hole: it is closely related to how the black hole system behaves. Various attempts have been made to derive the spin of black holes, in which the orientation in space could be deduced using the spectrum produced by the accretion disk, observation of the jets produced by black holes, and calculation of the orbit of black hole binaries using light and velocity curves. These observations, however, can sometimes lead to disagreeing results. In this paper, conflicts of the orientations of the spins of black holes measured using these different methods are presented. Sources including XTE J1550-564, V404 Cyg, and V4641 Sgr display misaligned accretion disk with orbital plane and/or jets. Explanations of how such misalignments could arise are also given, including warped accretion disks and precessing jets.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"51 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140259035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Research on Euler Totient function equation k(n)=n-1 欧拉梯度函数方程 k(n)=n-1 的研究
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241069
Jiaqi Shi
{"title":"Research on Euler Totient function equation k(n)=n-1","authors":"Jiaqi Shi","doi":"10.54254/2753-8818/31/20241069","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241069","url":null,"abstract":"Let denote Eulers Totient function. There are some properties about (n), when n is a prime or n=p_1^(r_1 )p_k^(r^k ). The Eulers function equation, k(n)=n-1(1), where k is a positive integer, and n is a composite number, is called Lehmers conjecture. Lehmer mentioned a series of properties of n that satisfy the equation in his own thesis and provided some proof. Afterwards, Ke Zhao and Sun Qi conducted further research. In previous studies, this conjecture was considered correct, but it is difficult to prove it. The case k=2 has been discussed and proved that when k=2 and n=p_1 p_2,... p_i are different prime numbers. Also, some properties of the composite numbers that satisfy the equation have also been proven. Some conclusions can be proven, by using elementary number theory methods. Using these conclusions, we can conclue that when k=2, the solution of (1) is at least the product of 12 odd prime numbers.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"9 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140260106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Bridging theory and application: An in-depth study of the greatest common divisor and least common multiple in mathematics and real-world settings 连接理论与应用：深入研究数学和现实世界中的最大公约数和最小公倍数
Theoretical and Natural Science Pub Date : 2024-03-07 DOI: 10.54254/2753-8818/31/20241132
Yuechi Xu
{"title":"Bridging theory and application: An in-depth study of the greatest common divisor and least common multiple in mathematics and real-world settings","authors":"Yuechi Xu","doi":"10.54254/2753-8818/31/20241132","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241132","url":null,"abstract":"The study of the Least Common Multiple (LCM) and the Greatest Common Divisor (GCD) explores the fundamental field of number theory. In addition to being essential to theoretical number theory, these mathematical ideas have extensive applications in computer science, algebra, and real-world settings like network routing and scheduling. Using techniques like the Euclidean algorithm for GCD calculation and prime factorization for LCM, the study starts by examining the fundamental concepts and notations of GCD and LCM. Then the author goes further into the detail about how these ideas are used to polynomial equations, highlighting how they may be used to solve challenging issues and simplify algebraic expressions. The studys practical applications, which demonstrate how GCD and LCM optimize scheduling tasks and boost network routing efficiency, are presented in the conclusion. The results of this study highlight the broad impact and adaptability of LCM and GCD in theoretical and applied mathematics, providing valuable insights for further research in these domains.","PeriodicalId":506830,"journal":{"name":"Theoretical and Natural Science","volume":"10 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140260291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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