Theoretical and Natural Science最新文献_第2页

Variable magnification beam expander system based on semiconductor laser 基于半导体激光器的可变倍率扩束系统

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/34/20241186

Ke Zhang, Zhanqiang Ru, Peng Ding, Kunkun Hao, Tengfei Han, Chengao Wang, Yang Xiang

{"title":"Variable magnification beam expander system based on semiconductor laser","authors":"Ke Zhang, Zhanqiang Ru, Peng Ding, Kunkun Hao, Tengfei Han, Chengao Wang, Yang Xiang","doi":"10.54254/2753-8818/34/20241186","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241186","url":null,"abstract":"Due to the different divergence angles in two perpendicular directions and the presence of astigmatism in edge-emitting semiconductor lasers, the communication distance and efficiency of underwater communication are seriously affected. Therefore, based on the fact that the semiconductor laser beam belongs to Gaussian beam, satisfying Gaussian characteristics and collimating and expanding characteristics, a system composed of fast-axis collimation mirror and variable magnification beam expander is designed. Simulation is performed, and the final divergence angle is calculated. Experimental results show that the divergence angles of the fast axis and the slow axis have been compressed from 49 and 9, respectively, to 0.315 mrad and 0.180 mrad. Simulation demonstrates that the system can achieve propagation over a distance of 100m underwater and solve the alignment difficulty of APT. The designed structure is compact, easy for processing and adjustment, with high practical value, which helps to solve the problems of optical energy loss and low coupling efficiency in underwater long-distance communication.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"22 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754010","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

Blockchain security and applications: A comprehensive analysis from hash functions to consensus algorithms 区块链安全与应用：从哈希函数到共识算法的全面分析

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/31/20240862

Xuyang Wang

{"title":"Blockchain security and applications: A comprehensive analysis from hash functions to consensus algorithms","authors":"Xuyang Wang","doi":"10.54254/2753-8818/31/20240862","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20240862","url":null,"abstract":"This article delves into the inherent security of blockchain technology by evaluating the sophisticated techniques it employs. Key among these are mathematical hash functions, elliptic curve cryptography, and zero-knowledge proofs. Mathematical hash functions ensure that data stored is immutable; any slight alteration to the information will lead to a drastically different hash output, making any tampering evident. Elliptic curve cryptography provides a robust encryption mechanism, ensuring that data transactions remain confidential and secure. Meanwhile, zero-knowledge proofs enable one party to prove to another that they possess specific knowledge without revealing the actual information, further bolstering privacy. Owing to these technological underpinnings, blockchain not only excels in safeguarding sensitive data but also facilitates operations like verifying information authenticity. Moreover, in sectors like supply chain management, it offers capabilities for precise logistics positioning and traceability. Such applications underline blockchains potential as a tool for transparency and security in various industries. Through these features and mechanisms, blockchain stands as an exemplar of digital security in todays interconnected era.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"162 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140755021","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

Symmetry and symmetric transformations in mathematical imaging 数学成像中的对称和对称变换

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/31/20241037

Yifeng Wang

{"title":"Symmetry and symmetric transformations in mathematical imaging","authors":"Yifeng Wang","doi":"10.54254/2753-8818/31/20241037","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241037","url":null,"abstract":"The article delves into the intricate relationship between symmetry and mathematical imaging, spanning various mathematical disciplines. Symmetry, a concept deeply ingrained in mathematics, manifests in art, nature, and physics, providing a powerful tool for understanding complex structures. The paper explores three types of symmetriesreflection, rotational, and translationalexemplified through concrete mathematical expressions. Evariste Galoiss Group Theory emerges as a pivotal tool, providing a formal framework to understand and classify symmetric operations, particularly in the roots of polynomial equations. Galois theory, a cornerstone of modern algebra, connects symmetries, permutations, and solvability of equations. Group theory finds practical applications in cryptography, physics, and coding theory. Sophus Lie extends group theory to continuous spaces with Lie Group Theory, offering a powerful framework for studying continuous symmetries. Lie groups find applications in robotics and control theory, streamlining the representation of transformations. Benoit Mandelbrots fractal geometry, introduced in the late 20th century, provides a mathematical framework for understanding complex, self-similar shapes. The applications of fractal geometry range from computer graphics to financial modeling. Symmetrys practical applications extend to data visualization and cryptography. The article concludes by emphasizing symmetrys foundational role in physics, chemistry, computer graphics, and beyond. A deeper understanding of symmetry not only enriches perspectives across scientific disciplines but also fosters interdisciplinary collaborations, unveiling hidden order and structure in the natural and designed world. The exploration of symmetry promises ongoing discoveries at the intersection of mathematics and diverse fields of study.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"231 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754706","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

FT_HTlist: A fault-tolerant frequent itemset mining algorithm based on the linear table FT_HTlist：基于线性表的容错频繁项集挖掘算法

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/34/20241168

Xingyue Li, Jun Lu

引用次数: 0

The role of AI in theatre: Exploring the creation of AI-generated stage plays 人工智能在戏剧中的作用：探索创作人工智能生成的舞台剧

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/34/20241146

Zhen Ren

引用次数: 0

Capturing the 3D secrets of a flickering candle: Based on digital holographic microscopy 捕捉闪烁蜡烛的三维秘密：基于数字全息显微技术

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/34/20241138

Shaohan Qin

{"title":"Capturing the 3D secrets of a flickering candle: Based on digital holographic microscopy","authors":"Shaohan Qin","doi":"10.54254/2753-8818/34/20241138","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241138","url":null,"abstract":"The temperature distribution of flames has long been a fascinating topic of study. To quantitatively analyze the temperature field of flames, traditional methods include infrared devices, thermocouples and thermometer. However, these conventional techniques provide only cross-sectional snapshots while lacking the capability to offer real-time 3D temperature field visualization. This paper proposed a different approach to measure the 3D temperature field with accurate data and details by applying the digital holography. First, based on digital holography and the equations of thermodynamics, we derived the equation between the phase difference and temperature. Then we built a transmission off-axis digital holographic microscopy in the experimental section to perform static and dynamic flame measurements. To calibrate the actual temperatures and test our theorys accuracy, we also took photographs of the flames as a standard reference using an infrared thermal imager. Finally, we obtained a quantitative 3D distribution of the temperature field and a qualitative dynamic process of 3D temperature field. Our results show that the temperature decreases from the center of the flame and follows a general pattern. The comparison with infrared imaging shows that digital holography offers an accurate measurement of the temperature.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"17 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754850","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

Design and implementation of architectural websites based on Java: A case study of architectural firm website 基于 Java 的建筑网站的设计与实施：建筑公司网站案例研究

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/34/20241162

Shixuan Li

{"title":"Design and implementation of architectural websites based on Java: A case study of architectural firm website","authors":"Shixuan Li","doi":"10.54254/2753-8818/34/20241162","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241162","url":null,"abstract":"In the contemporary digital landscape, architectural firms are increasingly reliant on sophisticated websites to showcase their portfolios and engage with clients. This paper delves into creating a user-centered website, emphasizing the critical role of front-end development in marrying aesthetics with functionality. Through a detailed examination, the study highlights prevailing trends in user interaction, visual design, and technological integration specific to architectural web platforms. In this paper, a prototype website was designed and implemented, utilizing HTML5, CSS3, and JavaScript, coupled with responsive design principles and interactive features. The development process involved using interactive keywords, a dynamic project gallery, and a responsive navigation menu, all facilitated by Java Server Pages (JSP) for back-end integration. This approach underscored the importance of user-centered design in web development for architectural firms. This study successfully integrated an intuitive user interface with advanced functionality, resulting in a web design that not only aesthetically aligns with the architectural firms brand identity but also enhances user engagement. Key results include an innovative scrolling gallery showcasing architectural projects, seamless integration of JSP for dynamic content management, and a notable improvement in website navigability and responsiveness, leading to a more interactive and satisfying user experience.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"421 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140751448","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

International flight fare prediction and analysis of factors impacting flight fare 国际航班票价预测及影响因素分析

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/31/20241079

Tianyun Deng

{"title":"International flight fare prediction and analysis of factors impacting flight fare","authors":"Tianyun Deng","doi":"10.54254/2753-8818/31/20241079","DOIUrl":"https://doi.org/10.54254/2753-8818/31/20241079","url":null,"abstract":"In the rapidly evolving landscape of global travel, understanding international flight prices has become pivotal for both travellers and airlines. This paper delves into the intricate web of factors influencing flight prices, utilizing a dataset from Ease My Trip spanning 50 days. Employing rigorous data processing techniques, including handling missing values and label encoding, the study explores correlations between various parameters such as cabin class, flight numbers, airlines, and duration, shedding light on pricing dynamics. The research employs linear regression, decision trees, and random forest models for prediction. The results showcase the significance of class, flight numbers, and duration on prices. Particularly, higher cabin classes correlate strongly with increased prices, offering vital insights for airlines to optimize revenue. The models predictive accuracies are commendable, with the random forest model standing out, explaining 98.9% of the variance. This study not only illuminates the complex interplay of factors steering international flight prices but also provides airlines with robust pricing strategies. The findings empower travellers to make informed decisions, promising a harmonious future for the aviation industry in an ever-changing global market.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"43 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140752004","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

Investigation on angle of incidence and light reflectance 关于入射角和光反射的研究

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/34/20241154

Zixi Chen

{"title":"Investigation on angle of incidence and light reflectance","authors":"Zixi Chen","doi":"10.54254/2753-8818/34/20241154","DOIUrl":"https://doi.org/10.54254/2753-8818/34/20241154","url":null,"abstract":"Illuminance is a measurement proportional to the intensity of light. When light is incident on a surface, the angle it makes with the normal vector of the surface plane is the angle of incidence. This paper focuses on an investigation of the relationship between the illuminance of reflected light from a glass block and the angle of incidence of the light on the block. By applying Fresnels coefficients, an expression for the illuminance of reflected light is derived in terms of the angle of incidence. The controlled measurements, including the illuminance of s-polarized and p-polarized light of a green laser (532nm), are directly measured to arrive at a set of calculated reflected illuminance at 10 different angles of incidence. The reflected illuminance is also experimentally measured with a light sensor at these angles. Upon the comparison between the two sets of data in this paper, a close resemblance of the shape of their curves is observed, both revealing an increasing reflected illuminance with a growing rate with respect to the increase of the angle of incidence. However, due to some expected systematic errors in the experiment, the calculated data has a generally higher reflected illuminance than the theoretical data at each angle of incidence. Overall, it is confirmed that as the angle of incidence increases, the illuminance of the reflected light increases with a growing rate.","PeriodicalId":489336,"journal":{"name":"Theoretical and Natural Science","volume":"44 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140754072","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 high-rise building risk identification and safety risk factor analysis 高层建筑风险识别与安全风险因素分析研究

Theoretical and Natural Science Pub Date : 2024-04-02 DOI: 10.54254/2753-8818/31/20240997

Xueqi Zhao

引用次数: 0