Inventions最新文献_第2页

Influence of Density Ratios on Richtmyer–Meshkov Instability with Non-Equilibrium Effects in the Reshock Process 再冲击过程中密度比对具有非平衡效应的里氏-梅什科夫不稳定性的影响

IF 3.4

Inventions Pub Date : 2023-12-13 DOI: 10.3390/inventions8060157

Tao Yang, Chuandong Lin, Demei Li, Huilin Lai

{"title":"Influence of Density Ratios on Richtmyer–Meshkov Instability with Non-Equilibrium Effects in the Reshock Process","authors":"Tao Yang, Chuandong Lin, Demei Li, Huilin Lai","doi":"10.3390/inventions8060157","DOIUrl":"https://doi.org/10.3390/inventions8060157","url":null,"abstract":"The Richtmyer–Meshkov instability in a two-component system during the reshock process for various density ratios is studied through the discrete Boltzmann method. Detailed investigations are conducted on both hydrodynamic and thermodynamic non-equilibrium behaviors. Specifically, the analysis focuses on the density gradient, viscous stress tensor, heat flux strength, thermodynamic non-equilibrium intensity, and thermodynamic non-equilibrium area. It is interesting to observe the complex variations to non-equilibrium quantities with the changing shock front, rarefaction wave, transverse wave, and material interface. Physically, the non-equilibrium area is extended as the perturbed material interface grows after the passing of the shock wave or secondary impact. Moreover, the global non-equilibrium manifestation decreases when the transmitted shock front and transverse waves leave or when the reflected rarefaction wave weakens. Additionally, the global thermodynamic non-equilibrium effect is enhanced as the physical gradients or non-equilibrium area increase. Finally, the local non-equilibrium effect decreases when the fluid structure gradually disappears under the action of dissipation/diffusion.","PeriodicalId":14564,"journal":{"name":"Inventions","volume":"179 S445","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006136","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

A Surface-Enhanced Raman Spectroscopic Sensor Pen 表面增强拉曼光谱传感器笔

IF 3.4

Inventions Pub Date : 2023-12-12 DOI: 10.3390/inventions8060156

Zejiang Song, Zhijie Li, Weishen Zhan, Wanli Zhao, Hisang-Chen Chui, Rui Li

引用次数: 0

Development of the Phaseless Calibration Algorithm for a Digital Antenna Array 数字天线阵无相校准算法的开发

IF 3.4

Inventions Pub Date : 2023-12-11 DOI: 10.3390/inventions8060155

Elena Dobychina, M. Snastin, Vladimir Savchenko, T. Shevgunov

{"title":"Development of the Phaseless Calibration Algorithm for a Digital Antenna Array","authors":"Elena Dobychina, M. Snastin, Vladimir Savchenko, T. Shevgunov","doi":"10.3390/inventions8060155","DOIUrl":"https://doi.org/10.3390/inventions8060155","url":null,"abstract":"In this paper, we will discuss a calibration algorithm for a digital antenna array that diagnoses its real performance. It can be applied at such stages of the antenna system life cycle as design, tuning, and especially maintenance. A calibration implementation using a scalar method for a multi-beam digital antenna array is proposed and investigated. On-the-fly calibration ensures a continuous improvement in beam pointing accuracy by reducing internal errors in the receiving (transmitting) channels. The purpose of the study is to experimentally examine the capabilities of digital beamforming to increase the angle-of-arrival estimation accuracy. A simulation model of the receiving antenna was created in an anechoic chamber with a planar antenna positioner. The possibility of precise estimation of the direction of arrival using the digital beamforming with electronic scanning was demonstrated. The proposed simulation model made it possible to observe the convergence of the antenna array calibration process using the proposed method for various errors in the signal paths, as well as different signal-to-noise ratios. It has been proven that even under adverse conditions early in the calibration algorithm, the phase error detection converges with high accuracy, and its value decreases uniformly even to the fractions of an angular degree.","PeriodicalId":14564,"journal":{"name":"Inventions","volume":"19 8","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138979999","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

Load Losses and Short-Circuit Resistances of Distribution Transformers According to IEEE Standard C57.110 根据 IEEE 标准 C57.110 确定配电变压器的负载损耗和短路电阻

IF 3.4

Inventions Pub Date : 2023-12-08 DOI: 10.3390/inventions8060154

V. León-Martínez, E. Peñalvo-López, Clara Andrada-Monrós, Juan Ángel Sáiz-Jiménez

{"title":"Load Losses and Short-Circuit Resistances of Distribution Transformers According to IEEE Standard C57.110","authors":"V. León-Martínez, E. Peñalvo-López, Clara Andrada-Monrós, Juan Ángel Sáiz-Jiménez","doi":"10.3390/inventions8060154","DOIUrl":"https://doi.org/10.3390/inventions8060154","url":null,"abstract":"Load losses determine transformers’ efficiency and life, which are limited by overheating and deterioration of their elements. Since these losses can be characterized by short-circuit resistances, in this article, we have developed expressions for the short-circuit resistances of three-phase transformers according to IEEE Standard C57.110. Imposing the condition that these resistances must cause load losses of the transformer, two types of short-circuit resistance have been established: (1) the effective resistance of each phase (Rcc,z) and (2) the effective short-circuit resistance of the transformer (Rcc,ef). The first is closely related to the power loss distribution within the transformer. The second is just a mathematical parameter. Applying these resistances to the 630 kVA oil-immersed distribution transformer of a residential network, we have concluded that both types of resistances determine the total load losses of the transformer. However, only Rcc,z accurately provides the load losses in each phase. Rcc,ef can give rise to errors more significant than 16% in calculating these losses, depending on imbalances in the harmonic currents.","PeriodicalId":14564,"journal":{"name":"Inventions","volume":"6 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139011546","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

SpiderID_APP: A User-Friendly APP for Spider Identification in Taiwan Using YOLO-Based Deep Learning Models SpiderID_APP：使用基于 YOLO 的深度学习模型识别台湾蜘蛛的用户友好型 APP

IF 3.4

Inventions Pub Date : 2023-12-06 DOI: 10.3390/inventions8060153

Cao Thang Luong, Ali Farhan, Ross D. Vasquez, M. J. Roldan, Yih-Kai Lin, Shih-Yen Hsu, Ming-Der Lin, Chung-Der Hsiao, Chih-Hsin Hung

{"title":"SpiderID_APP: A User-Friendly APP for Spider Identification in Taiwan Using YOLO-Based Deep Learning Models","authors":"Cao Thang Luong, Ali Farhan, Ross D. Vasquez, M. J. Roldan, Yih-Kai Lin, Shih-Yen Hsu, Ming-Der Lin, Chung-Der Hsiao, Chih-Hsin Hung","doi":"10.3390/inventions8060153","DOIUrl":"https://doi.org/10.3390/inventions8060153","url":null,"abstract":"Accurate and rapid taxonomy identification is the initial step in spider image recognition. More than 50,000 spider species are estimated to exist worldwide; however, their identification is still challenging due to the morphological similarity in their physical structures. Deep learning is a known modern technique in computer science, biomedical science, and bioinformatics. With the help of deep learning, new opportunities are available to reveal advanced taxonomic methods. In this study, we applied a deep-learning-based approach using the YOLOv7 framework to provide an efficient and user-friendly identification tool for spider species found in Taiwan called Spider Identification APP (SpiderID_APP). The YOLOv7 model is integrated as a fully connected neural network. The training of the model was performed on 24,000 images retrieved from the freely available annotated database iNaturalist. We provided 120 genus classifications for Taiwan spider species, and the results exhibited accuracy on par with iNaturalist. Furthermore, the presented SpiderID_APP is time- and cost-effective, and researchers and citizen scientists can use this APP as an initial entry point to perform spider identification in Taiwan. However, for detailed species identification at the species level, additional methods like DNA barcoding or genitalic structure dissection are still considered necessary.","PeriodicalId":14564,"journal":{"name":"Inventions","volume":"60 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138597311","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

Review of Key Technologies of Rotary-Wing Mars UAVs for Mars Exploration 用于火星探测的旋翼火星无人机关键技术综述

IF 3.4

Inventions Pub Date : 2023-11-29 DOI: 10.3390/inventions8060151

Pengyue Zhao, Ruihan Li, Peng Wu, Huan Liu, Xifeng Gao, Zongquan Deng

引用次数: 0

Cyclic Detectors in the Fraction-of-Time Probability Framework 时间分数概率框架中的循环检测器

IF 3.4

Inventions Pub Date : 2023-11-29 DOI: 10.3390/inventions8060152

D. Dehay, J. Leśkow, Antonio Napolitano, T. Shevgunov

{"title":"Cyclic Detectors in the Fraction-of-Time Probability Framework","authors":"D. Dehay, J. Leśkow, Antonio Napolitano, T. Shevgunov","doi":"10.3390/inventions8060152","DOIUrl":"https://doi.org/10.3390/inventions8060152","url":null,"abstract":"The signal detection problem for cyclostationary signals is addressed within the fraction-of-time probability framework, where statistical functions are constructed starting from a single time series, without introducing the concept of stochastic process. Single-cycle detectors and quadratic-form detectors based on measurements of the Fourier coefficients of the almost-periodically time-variant cumulative distribution and probability density functions are proposed. The adopted fraction-of-time approach provides both methodological and implementation advantages for the proposed detectors. For single-cycle detectors, the decision statistic is a function of the received signal and the threshold is derived using side data under the null hypothesis. For quadratic-form detectors, the decision statistic can be expressed as a function of the received signal without using side data, at the cost of some performance degradation. The threshold can be derived analytically. Performance analysis is carried out using Monte Carlo simulations in severe noise and interference environments, where the proposed detectors provide better performance with respect to the analogous detectors based on second- and higher-order cyclic statistic measurements.","PeriodicalId":14564,"journal":{"name":"Inventions","volume":"113 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139213166","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

Applications of the Order Reduction Optimization of the H-Infinity Controller in Smart Structures 智能结构中 H-Infinity 控制器的降阶优化应用

IF 3.4

Inventions Pub Date : 2023-11-22 DOI: 10.3390/inventions8060150

Amalia Moutsopoulou, M. Petousis, N. Vidakis, G. Stavroulakis, A. Pouliezos

{"title":"Applications of the Order Reduction Optimization of the H-Infinity Controller in Smart Structures","authors":"Amalia Moutsopoulou, M. Petousis, N. Vidakis, G. Stavroulakis, A. Pouliezos","doi":"10.3390/inventions8060150","DOIUrl":"https://doi.org/10.3390/inventions8060150","url":null,"abstract":"In this paper, our strategy is to look for locally optimum answers to a non-smooth optimization problem that has been constructed to include minimization goals and restrictions for smart structures’ vibration suppression. In both theoretical analysis and practical implementation, it is widely recognized that designing multi-objective control systems poses a considerable challenge. In this study, we assess the effectiveness of this method by employing the open-source Matlab toolbox Hifoo 2.0 and juxtapose our findings with established industry standards. We start by framing the control problem as a mathematical optimization issue and proceed to identify the controller that effectively addresses this optimization. This approach introduces the potential application of intelligent structures in tackling the challenge of vibration suppression. This study makes use of the most recent version of the freely available application Hifoo which tries to study vibration suppression with the limits outlined above in the context of multi-objective controller design. A controller directive is initially set, allowing for a lower order.","PeriodicalId":14564,"journal":{"name":"Inventions","volume":"200 ","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139249730","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

Classifying Invention Objectives of Electric Vehicle Chargers through Natural Language Processing and Machine Learning 通过自然语言处理和机器学习对电动汽车充电器的发明目标进行分类

IF 3.4

Inventions Pub Date : 2023-11-19 DOI: 10.3390/inventions8060149

R. Bridgelall

{"title":"Classifying Invention Objectives of Electric Vehicle Chargers through Natural Language Processing and Machine Learning","authors":"R. Bridgelall","doi":"10.3390/inventions8060149","DOIUrl":"https://doi.org/10.3390/inventions8060149","url":null,"abstract":"The gradual adoption of electric vehicles (EVs) globally serves as a crucial move toward addressing global decarbonization goals for sustainable development. However, the lack of cost-effective, power-efficient, and safe chargers for EV batteries hampers adoption. Understanding the research needs and identifying the gaps in EV charger innovation informs investments and research to address development challenges. This study developed a unique text mining workflow to classify themes in EV charger technology and product development by analyzing U.S. patent award summaries. The text mining workflow combined the techniques of data extraction, data cleaning, natural language processing (NLP), statistical analysis, and unsupervised machine learning (ML) to extract unique themes and to visualize their relationships. There was a 47.7% increase in the number of EV charger patents issued in 2022 relative to that in 2018. The top four themes were charging station management, power transfer efficiency, on-board charger design, and temperature management. More than half (53.8%) of the EV charger patents issued over the five-year period from 2018 to 2022 addressed problems within those four themes. Patents that addressed wireless charging, fast charging, and fleet charging accounted for less than 10% each of the EV charger patents issued. This suggests that the industry is still at the frontier of addressing those problems. This study further presents examples of the specific EV charger problems addressed within each theme. The findings can inform investment decisions and policymaking to focus on R&D resources that will advance the state of the art and spur EV adoption.","PeriodicalId":14564,"journal":{"name":"Inventions","volume":"66 2","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139260034","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

Flow Instability Control in a Model Swirl-Stabilized Combustor with Central Jet Injection 带中央喷射的模型漩涡稳定燃烧器中的流动不稳定性控制

IF 3.4

Inventions Pub Date : 2023-11-17 DOI: 10.3390/inventions8060148

Alexey Savitskii, D. Sharaborin, L. Chikishev, V. Dulin

引用次数: 0