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Seeing the piano sound Exploration on utilizing finite element analysis to visualize piano sound 看到钢琴的声音 利用有限元分析将钢琴声音可视化的探索
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241122
Yifan Xia
The study aims to provide a way for impaired people to learn music better through music visualization. We established a relationship between piano key frequencies and Chladni patterns. Firstly, we performed modal analysis simulations using ANSYS, covering the full range of excitable modes in the frequency range of the piano keys. However, since the natural frequencies of the simulation results were slightly different from experimental results, we used the hammering method to validate the simulation results and to demonstrate that the finite element modal analysis was able to simulate the dynamic properties of the circular plate well. Subsequent studies have found that different excitation frequencies in the lower frequency range may also affect the generation of Chladni patterns. Using harmonic analysis in ANSYS, we confirmed that tones of similar frequency on the same plate can produce different Chladni patterns, thus greatly simplifying the previous problem of having to use multiple plates of different shapes and sizes in order to visualize most of the piano keys. Based on the graphical simulation of a single tone, we have successfully extended it to a melody. This result provides strong support for effectively helping the hearing impaired to learn to play musical instruments, makes it possible to present music in a visual form, and opens up new possibilities for the wider use of music education tools in the hearing-impaired community.
这项研究旨在为残障人士提供一种通过音乐可视化更好地学习音乐的方法。我们建立了钢琴键频率与 Chladni 模式之间的关系。首先,我们使用 ANSYS 进行了模态分析模拟,涵盖了钢琴琴键频率范围内的所有可激发模态。然而,由于模拟结果的固有频率与实验结果略有不同,我们采用了锤击法来验证模拟结果,并证明有限元模态分析能够很好地模拟圆板的动态特性。随后的研究发现,低频范围内不同的激励频率也可能影响 Chladni 模式的产生。利用 ANSYS 中的谐波分析,我们证实了频率相近的音调在同一块板上可以产生不同的 Chladni 图案,从而大大简化了以前必须使用多块不同形状和大小的板才能观察到大部分钢琴键的问题。在对单个音调进行图形模拟的基础上,我们成功地将其扩展到了旋律。这一成果为有效帮助听障人士学习乐器提供了有力的支持,使以可视化的形式呈现音乐成为可能,并为听障人士更广泛地使用音乐教育工具开辟了新的可能性。
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引用次数: 0
Properties and applications of two-dimensional quantum materials beyond carbon 碳之外的二维量子材料的特性和应用
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241084
Jiachen Liu
Two-dimensional quantum materials are currently a hot research area in the field of materials. These unique materials allow electrons to move freely in only two dimensions and the other dimension is limited within the atom scale. The isolation of Graphene in 2004 showed the advantages of two-dimensional (2D) materials and led a rapid development in this field. Meanwhile, it stimulates the synthesis and research of the materials beyond carbon. 2D materials beyond carbon have different components and structures, showing a broader range of remarkable properties and applications than traditional graphene. This article will pay attention to the phenomenon and mechanism of these exceptional properties, including superconductivity, ferromagnetism, antiferromagnetism, and quantum spin liquid phase. Additionally, potential applications and future prospects of 2D materials beyond carbon will be explored. With the progress of technology, 2D materials beyond carbon are expected to have exciting developments in various fields, leading to significant changes in human life and production
二维量子材料是目前材料领域的热门研究领域。这些独特的材料只允许电子在两个维度上自由移动,而另一个维度则限制在原子尺度内。2004 年石墨烯的分离显示了二维(2D)材料的优势,并带动了该领域的快速发展。同时,它也刺激了碳以外材料的合成和研究。超越碳的二维材料具有不同的成分和结构,与传统石墨烯相比,显示出更广泛的卓越性能和应用。本文将关注这些特殊性质的现象和机理,包括超导性、铁磁性、反铁磁性和量子自旋液相。此外,还将探讨碳以外二维材料的潜在应用和未来前景。随着技术的进步,碳以外的二维材料有望在各个领域取得令人振奋的发展,给人类的生活和生产带来重大变化。
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引用次数: 0
A review of the explanations to the twin paradox 回顾对双胞胎悖论的解释
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241098
Qiyu Fan
The Twin Paradox is a representative problem in special relativity. It proposed a problem that from a spacecraft that is moving at a speed close to light, the earths time will be slower; in contrast, the earth will also consider the time of the spacecraft slower. However, this paradoxs solution can expand beyond the special relativity and Lorentz transformation. Basically, the seeming paradox can be solved using the period when the spacecraft turns around. Therefore, it can be considered a good way to have a better understanding of relativity. In this paper, this paradox is explained in three ways: the Lorentz transformation, the Minkowski geometry, a special geometry including both space and time, which is proposed to have a better explanation of the special relativity and gravitational time dilation in general relativity, and will also expand to other effects in relativity, such as the gravitational redshift. This paper hopes to offer some references for a better understanding of the Twin Paradox.
双子悖论是狭义相对论中的一个代表性问题。它提出了这样一个问题:从以接近光速运动的宇宙飞船上看,地球的时间会变慢;相反,地球也会认为宇宙飞船的时间变慢。然而,这个悖论的解决方案可以超越狭义相对论和洛伦兹变换。从根本上说,这个看似悖论的问题可以用宇宙飞船掉头的时间段来解决。因此,这可以说是更好地理解相对论的一个好方法。本文从三个方面解释了这一悖论:洛伦兹变换、闵科夫斯基几何、一种包括空间和时间的特殊几何。本文提出的闵科夫斯基几何可以更好地解释狭义相对论和广义相对论中的引力时间膨胀,还将扩展到相对论中的其他效应,如引力红移。本文希望为更好地理解孪生悖论提供一些参考。
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引用次数: 0
Statistical forecasting of U.S. and Central African Republic net migration 美国和中非共和国净移民统计预测
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241029
Tianqing Bei, Hanlei Gao, Ruiyang Gao, Guangtong Shi
Immigration is a very important link in the current international society. This paper will study and predict the net immigration of the United States and the Central African Republic through two different models- drift model and ARIMA model, and to further explore the trends and influencing factors of migration between these countries. The results show that from 1960 to 2021, net migration from the United States and the Central African Republic showed very different trends. The United States, as a developed country, attracts a large number of immigrants from all over the world, while the Central African Republic, as a developing country, the flow of immigrants is mainly affected by economic, political and social factors in the region. Therefore, it can be seen that developing countries and developed countries have different impacts on the number of immigrants. This study provides a basis for further understanding of population migration and net migration of United States and Central African Republic.
移民是当前国际社会中一个非常重要的环节。本文将通过两种不同的模型--漂移模型和 ARIMA 模型--对美国和中非共和国的净移民进行研究和预测,并进一步探讨这两个国家之间的移民趋势和影响因素。结果表明,从 1960 年到 2021 年,美国和中非共和国的净移民呈现出截然不同的趋势。美国作为发达国家,吸引了大量来自世界各地的移民,而中非共和国作为发展中国家,移民流动主要受该地区经济、政治和社会因素的影响。由此可见,发展中国家和发达国家对移民数量的影响是不同的。本研究为进一步了解美国和中非共和国的人口迁移和净移民提供了依据。
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引用次数: 0
U.S. unemployment rate prediction using time series model 利用时间序列模型预测美国失业率
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241129
Xintian Zou
Although previous studies have given a better prediction model for the Americans unemployment rate, due to the short time and different time nodes, the parameters of the model and the seasonality and the stability of the time series are also different. In this study, the ARIMA model, which is the most widely used in the time series, is adopted and the seasonal influence is added to the model according to the selected time period. At the same time, two models are used to predict the unemployment rate in the United States from January 2017 to January 2019. The stability of the model was determined by Dickey-Fuller test, and the fitting and prediction effects of the two models were compared by comparing the values of AIC and MSE. With the fitting prediction method of the unemployment rate in the United States, this paper can analyze and predict the unemployment rate in other Western countries, and can further compare and analyze the reasons with China s unemployment rate, which is convenient for us to better regulate macroeconomic policies.
虽然以往的研究对美国人的失业率给出了较好的预测模型,但由于时间短、时间节点不同,模型的参数和时间序列的季节性、稳定性也不同。本研究采用在时间序列中应用最为广泛的 ARIMA 模型,并根据所选时间段在模型中加入季节性影响因素。同时,采用两个模型预测美国 2017 年 1 月至 2019 年 1 月的失业率。通过 Dickey-Fuller 检验确定模型的稳定性,并通过比较 AIC 值和 MSE 值比较两个模型的拟合效果和预测效果。通过对美国失业率的拟合预测方法,本文可以对其他西方国家的失业率进行分析和预测,并可以进一步与中国的失业率进行对比分析原因,便于我们更好地进行宏观经济政策调控。
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引用次数: 0
Common transmission theory and wide application 常见的传输理论和广泛应用
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241095
Shiqi Liu
Gear and belts/chains are the most common solution for modern mechanical devices. The allowable stress and gear ratio are two of the main factors that decide the performance of the ear section for transmission. The allowable stress can be calculated by bending stress and contact stress from design criteria. The performance of the belt solution is decided by the belt/chain material, center distance and the belt length. The allowable strength of the belt/chain solution is strongly related to the materials selected. With the current study of belts and gears, the related factors could be calculated to design the optimum shape and material. Dual clutch transmission (DCT) and continuously variable transmission (CVT) are two widely applied transmissions with gear and belt/chain solutions that are introduced in the research. The advantages of DCT could be the reliability and high transmission efficiency of the gear solution and the space and energy efficiency of belt/chain structure advantages of the CVT. Both DCT and CVT could be applied in different conditions to maximize the specific performance.
齿轮和皮带/链条是现代机械设备最常见的解决方案。容许应力和齿轮比是决定传动装置耳部性能的两个主要因素。容许应力可通过设计标准中的弯曲应力和接触应力计算得出。皮带解决方案的性能由皮带/链条材料、中心距和皮带长度决定。带/链方案的容许强度与所选材料密切相关。通过目前对皮带和齿轮的研究,可以计算出相关因素,从而设计出最佳形状和材料。双离合变速器(DCT)和无级变速器(CVT)是研究中介绍的两种广泛应用的齿轮和带/链变速器。双离合变速器的优势在于齿轮方案的可靠性和高传动效率,而无级变速器的优势在于带/链结构的空间和能效。DCT 和 CVT 可在不同条件下应用,以最大限度地发挥各自的性能。
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引用次数: 0
The comprehensive analysis of Googles stock using ARIMA model 使用 ARIMA 模型全面分析 Googles 股票
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241062
Yijie Zhang
Predicting stock prices has long been a subject of keen interest due to its financial implications and inherent complexity. The examination of existing literature suggests the need for a focused study encompassing a diverse spectrum of stocks within a specific sector. In this research, the author evaluates the efficacy of the AutoRegressive Integrated Moving Average (ARIMA) model in forecasting Googles stock performance. The data used in this paper comes from the Chinese corn market price of 2018 to October 2023. The selection of the ARIMA model is based on its widespread acceptance and straightforward nature. This paper also explores how the accuracy of predictions is influenced by various historical data points. Simultaneously, the projections indicate that Googles stock is poised for continued growth in the upcoming weeks. This investigation aims to provide valuable insights into the stock markets behaviour, particularly within the context of Google, by leveraging the ARIMA models capabilities.
由于其财务影响和内在复杂性,股票价格预测长期以来一直是一个备受关注的课题。对现有文献的研究表明,有必要对特定行业内的各种股票进行重点研究。在本研究中,作者评估了自回归整合移动平均(ARIMA)模型在预测谷歌股票表现方面的功效。本文使用的数据来自 2018 年至 2023 年 10 月的中国玉米市场价格。选择ARIMA模型是基于其被广泛接受和简单明了的特点。本文还探讨了预测的准确性如何受到各种历史数据点的影响。同时,预测结果表明,Googles 的股票在未来几周内有望继续增长。这项调查旨在利用 ARIMA 模型的功能,为股票市场行为,尤其是谷歌的股票市场行为提供有价值的见解。
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引用次数: 0
Research on the selection of stock prediction models 股票预测模型选择研究
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241086
Renjun Huang
Against the backdrop of increasing attention to the integration of machine learning and stock analysis, stock prediction models are a hot topic. The question this paper is studying in this study is which stock prediction model is more accurate in predicting stocks. The method of this study is based on the stock prices of new energy vehicle leader Tesla Motors in the past three years as a data set, using a random forest model and an SVR model to predict the stock prices over the next 10 days. Based on the parameter MSE values of the training models of two stock prediction models, compare their sizes to determine the accuracy and stability of the models. This study found that the stock prediction results of the SVR model are more accurate and stable than those of the random forest model. Therefore, it is believed that the stock prediction model using the SVR method will have more market value and occupy an important position in the integration of machine learning and stock trading analysis.
在机器学习与股票分析的结合日益受到关注的背景下,股票预测模型成为一个热门话题。本文研究的问题是哪种股票预测模型预测股票更准确。本研究的方法是以新能源汽车领军企业特斯拉汽车公司过去三年的股票价格为数据集,使用随机森林模型和 SVR 模型预测未来 10 天的股票价格。根据两种股票预测模型训练模型的参数 MSE 值,比较它们的大小,以确定模型的准确性和稳定性。本研究发现,SVR 模型的股票预测结果比随机森林模型更准确、更稳定。因此,相信使用 SVR 方法的股票预测模型将更具市场价值,在机器学习与股票交易分析的结合中占据重要地位。
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引用次数: 0
Improving the flight endurance of multi-rotor drones in windy days 提高多旋翼无人机在大风天的飞行耐力
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241074
Tianhong Gao
Most recently, the technology of unmanned vehicles/systems (UVs/USs) has experienced substantial growth. These vehicles can operate on land, in water as well as and even through the air. They have become increasingly important in various civil applications, incorporating surveillance, precise farming, imagery collection, and search and rescue operations, surpassing manned systems in many aspects. Increased mission safety and cheaper operating expenses are provided by unmanned vehicles. UAVs, often known as unmanned aerial vehicles, are one of them that are widely utilized in construction projects because of its benefits including low costs for upkeep, simple deployment, the capacity to hover, and outstanding mobility. The most significant challenge facing the application of drones is their endurance, especially in harsh and windy weather conditions where drones consume power at a faster rate. In this paper, this work explores improvements in drone endurance through lightweight material design, battery enhancements, and path planning by studying and organizing relevant literature from various authors. These advancements aim to effectively extend the flight time of drones, thereby enabling them to successfully complete missions.
最近,无人驾驶飞行器/系统(UV/USs)技术有了长足的发展。这些飞行器可以在陆地、水中甚至空中运行。它们在各种民用领域的应用日益重要,包括监视、精确耕作、图像采集和搜救行动,在许多方面都超过了有人驾驶系统。无人驾驶飞行器提高了任务的安全性,降低了运营成本。无人驾驶飞行器(通常称为无人机)就是其中之一,由于其维护成本低、部署简单、可悬停和机动性强等优点,在建筑项目中得到广泛应用。无人机应用面临的最大挑战是其续航能力,尤其是在恶劣的大风天气条件下,无人机的耗电速度更快。本文通过研究和整理不同作者的相关文献,探讨如何通过轻质材料设计、电池增强和路径规划来提高无人机的续航能力。这些进步旨在有效延长无人机的飞行时间,从而使其能够顺利完成任务。
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引用次数: 0
Using machine learning for bike sharing demand prediction 利用机器学习预测共享单车需求
Pub Date : 2024-01-15 DOI: 10.54254/2753-8818/30/20241078
Xinyu Qian
Bike sharing has become a much more popular topic nowadays. Not only do the producers in bike-sharing need to provide a relatively accurate number of bikes in each period, but also the consumers need to have a general understanding of the number of bikes in each hour. This study analyses the dataset of bike-sharing rentals in 2011 in Washington, D.C. using machine learning, after training, testing, analyzing, and visualizing the dataset, the author chose the best model-random forest to predict it through the method of cross-test. The research result shows that the number of rentals in bike-sharing is the highest in the morning and evening travel peaks in one day, the highest in working days in one week, and the highest in autumn in one year. This information can help the bike-sharing service to prepare different quantities of bike-sharing at different times, and the customers would have a better overview of the bike demand when they plan to rent one. The whole research process provides valuable information for the service providers and users of bike-sharing.
如今,共享单车已成为一个更为热门的话题。不仅共享单车的生产者需要提供每个时段相对准确的单车数量,消费者也需要对每个小时的单车数量有一个大致的了解。本研究利用机器学习分析了华盛顿特区 2011 年共享单车的租赁数据集,在对数据集进行训练、测试、分析和可视化后,作者通过交叉测试的方法选择了最佳模型--随机森林进行预测。研究结果表明,共享单车的租赁量在一天中早晚出行高峰最高,在一周中工作日最高,在一年中秋季最高。这些信息可以帮助共享单车服务机构在不同时间段准备不同数量的共享单车,顾客在计划租车时也能更好地了解单车需求。整个研究过程为共享单车的服务提供商和用户提供了有价值的信息。
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引用次数: 0
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Theoretical and Natural Science
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