Review of Scientific Instruments最新文献_第7页

Dual-path differential perturbation sand cat swarm optimization algorithm integrated with escape mechanism. 集成逃逸机制的双路径差分扰动沙猫群优化算法。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0222940

Qian Qian, Wentao Luo, Jiawen Pan, Miao Song, Yong Feng, Yingna Li

{"title":"Dual-path differential perturbation sand cat swarm optimization algorithm integrated with escape mechanism.","authors":"Qian Qian, Wentao Luo, Jiawen Pan, Miao Song, Yong Feng, Yingna Li","doi":"10.1063/5.0222940","DOIUrl":"https://doi.org/10.1063/5.0222940","url":null,"abstract":"In this paper, based on the sand cat swarm optimization (SCSO) algorithm, a dual-path differential perturbation sand cat swarm optimization algorithm integrated with escape mechanism (EDSCSO) is proposed. EDSCSO aims to solve the problems of the original SCSO, such as the limited diversity of the population, low efficiency of solving complex functions, and ease of falling into a local optimal solution. First, an escape mechanism was proposed to balance the exploration and exploitation of the algorithm. Second, a random elite cooperative guidance strategy was used to utilize the elite population to guide the general population to improve the convergence speed of the algorithm. Finally, the dual-path differential perturbation strategy is used to continuously perturb the population using two differential variational operators to enrich population diversity. EDSCSO obtained the best average fitness for 27 of 39 test functions in the IEEE CEC2017 and IEEE CEC2019 test suites, indicating that the algorithm is an efficient and feasible solution for complex optimization problems. In addition, EDSCSO is applied to optimize the three-dimensional wireless sensor network coverage as well as the unmanned aerial vehicle path planning problem, and it provides optimal solutions for both problems. The applicability of EDSCSO in real-world optimization scenarios was verified.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"95 11","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142649035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 transformer fault diagnosis models with feature extraction. 利用特征提取的变压器故障诊断模型研究。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0225204

Yongcan Zhu, Zhenyan Guo, Xiaoxuan Zhan, Xinbo Huang

{"title":"Research on transformer fault diagnosis models with feature extraction.","authors":"Yongcan Zhu, Zhenyan Guo, Xiaoxuan Zhan, Xinbo Huang","doi":"10.1063/5.0225204","DOIUrl":"https://doi.org/10.1063/5.0225204","url":null,"abstract":"To address the challenge of low accuracy in traditional transformer fault diagnosis algorithms, this paper introduces a novel approach that utilizes the Artificial Hummingbird Algorithm (AHA) to optimize both Kernel Principal Component Analysis (KPCA) and Extreme Learning Machine (ELM). We propose the use of various gas concentration ratio features and apply the AHA algorithm to fine-tune the kernel function parameters of KPCA, thus establishing an AHA-KPCA feature extraction model. This model takes the expanded gas concentration ratio features as input and selects the top N principal components with a cumulative contribution rate above 95% to form the feature vectors for fault classification. Following this, the AHA algorithm is employed to optimize the input weights and hidden layer biases of the ELM, leading to the development of the AHA-ELM fault classification model. Ultimately, the principal components identified by AHA-KPCA serve as inputs for the simulation verification of the AHA-ELM model. Experimental results indicate that the proposed AHA-KPCA-ELM method attains an accuracy rate of 95.73%, surpassing traditional intelligent diagnostic methods and existing advanced algorithms, thereby confirming the effectiveness of our proposed method.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"95 11","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142710937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pitch angle and altitude control for unmanned helicopter based on new approximation-free control. 基于新型无近似控制的无人直升机俯仰角和高度控制。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0219636

Haixiang Jiang, Hao Yang, Jian Cen, Xinpan Gou, Yuji Chen

引用次数: 0

Investigation of an improved ceramic-based pulse-forming line based on impedance matching electrode. 基于阻抗匹配电极的改进型陶瓷脉冲形成线的研究

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0222752

Zebin Fu, Chenglin Jia, Fanzheng Zeng, Yifeng Liu, Jinhong Wei, Song Li

引用次数: 0

Theoretical characteristics of a three-point Roberts linkage. 三点罗伯茨连杆机构的理论特性。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0219859

M Otsuka, K Mitsuhashi, R Takahashi, Y Nishino, Y Aso, T Tomaru

引用次数: 0

Validation of galvanomagnetic and thermomagnetic transport measurements using Standard Reference Material 3451. 使用标准参考材料 3451 验证电流磁场和热磁场传输测量。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0235568

Matt Beekman, Matteo Benedetti, Deja Dominguez, Hayden Hewett-Abbott, Andrew Jarymowycz, Matthew Leibowitz, Travis Nichols, Roger Dorris, Kyle Thomson, Sarah J Watzman, Thu Gibson, Katherine A Schlaak

{"title":"Validation of galvanomagnetic and thermomagnetic transport measurements using Standard Reference Material 3451.","authors":"Matt Beekman, Matteo Benedetti, Deja Dominguez, Hayden Hewett-Abbott, Andrew Jarymowycz, Matthew Leibowitz, Travis Nichols, Roger Dorris, Kyle Thomson, Sarah J Watzman, Thu Gibson, Katherine A Schlaak","doi":"10.1063/5.0235568","DOIUrl":"https://doi.org/10.1063/5.0235568","url":null,"abstract":"In the \"method of four coefficients,\" electrical resistivity (ρ), Seebeck coefficient (S), Hall coefficient (RH), and Nernst coefficient (Q) of a material are measured and typically fit or modeled with theoretical expressions based on Boltzmann transport theory to glean experimental insights into features of electronic structure and/or charge carrier scattering mechanisms in materials. Although well-defined and readily available reference materials exist for validating measurements of ρ and S, none currently exists for RH or Q. We show that measurements of all four transport coefficients-ρ, S, RH, and Q-can be validated using a single reference sample, namely, the low-temperature Seebeck coefficient Standard Reference Material® (SRM) 3451 (composition Bi2Te3+x) available from the National Institute for Standards and Technology (NIST) without the need for inter-laboratory sample exchange. RH and Q data for NIST SRM 3451 reported here for the temperature range 80-400 K complement the data already available for ρ and S and will therefore be of interest to researchers desiring to validate new or existing galvanomagnetic and thermomagnetic transport properties measurement systems.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"95 11","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142676744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 testing of an (inert) gas cell for in situ polarization modulation infrared reflection absorption spectroscopic (PM-IRRAS) measurements under specific atmospheres. 设计和测试一个（惰性）气室，用于在特定大气条件下进行原位偏振调制红外反射吸收光谱（PM-IRRAS）测量。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0227001

Kai Uwe Clausen, Ralf Suren, Alexander Schlimm, Felix Tuczek

{"title":"Design and testing of an (inert) gas cell for in situ polarization modulation infrared reflection absorption spectroscopic (PM-IRRAS) measurements under specific atmospheres.","authors":"Kai Uwe Clausen, Ralf Suren, Alexander Schlimm, Felix Tuczek","doi":"10.1063/5.0227001","DOIUrl":"https://doi.org/10.1063/5.0227001","url":null,"abstract":"Infrared reflection absorption spectroscopy (IRRAS) is a powerful surface-sensitive analytical technique to characterize the adsorbed molecules on metal surfaces down to (sub)monolayer coverage. In this paper, a new (inert) gas cell is presented that expands the scope of the commercially available Bruker PMA50 module. The cell is designed as a sample holder to measure thin films of molecules adsorbed on a metal substrate under a specific gaseous atmosphere. The dimensions of the cell are chosen in such a way that it can be transferred into a glovebox via the standard entrance port (Ø150 mm), allowing the investigation of air-sensitive molecules under an inert-gas atmosphere. The cell has two hose connections through which the gas atmosphere can be varied as desired. This also allows for studying the reactivity of the adsorbed structures toward the surrounding gas in situ and in a (potentially) time-dependent fashion. Furthermore, the metal substrate can be irradiated via an exposure window to investigate the influence of light on the adsorbed molecules and/or their reactivity. Using the polarization-modulation (PM-) IRRAS technique along with the described gas cell, an air-sensitive molybdenum(0) tricarbonyl complex adsorbed on an Au(111) surface is investigated. This complex reacts with molecular oxygen to the molybdenum(VI) trioxo analog, and this conversion is accelerated by irradiation with light of 365 and 440 nm.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"95 11","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Passive shimming of a 3T cryogen-free animal magnetic resonance imaging superconducting magnet with dense shim tray slots and small residual magnetic force. 具有密集垫片托盘槽和较小残余磁力的 3T 无低温动物磁共振成像超导磁体的被动垫片。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0215247

Pengfei Wu, Yaohui Wang, Wenchen Wang, Weimin Wang, Jinhao Liu, Guyue Zhou, Haoran Chen, Hui Wang, Shunzhong Chen, Jinshui Sun, Feng Liu

{"title":"Passive shimming of a 3T cryogen-free animal magnetic resonance imaging superconducting magnet with dense shim tray slots and small residual magnetic force.","authors":"Pengfei Wu, Yaohui Wang, Wenchen Wang, Weimin Wang, Jinhao Liu, Guyue Zhou, Haoran Chen, Hui Wang, Shunzhong Chen, Jinshui Sun, Feng Liu","doi":"10.1063/5.0215247","DOIUrl":"https://doi.org/10.1063/5.0215247","url":null,"abstract":"Passive shimming is widely used in magnetic resonance imaging (MRI) systems due to its excellent efficacy and cost-effectiveness. However, conventional shim tray structures have difficulty in effectively adjusting magnetic field distributions under specific conditions. This limitation can lead to insufficient cancellation of harmonics and result in significant residual forces on the trays, impeding accurate placement of the trays. In this study, instead of using the conventional design of the shim tray slot, we propose a dedicated passive shimming tray tailored for 3T cryogen-free animal MRI superconducting magnets. Passive shimming experiments were conducted to evaluate the performance of this novel design, in which we were able to improve the peak-to-peak magnetic field homogeneity within the 180 mm diameter imaging region, reducing peak-to-peak (p-p) variation from 349.35 ppm to 19.08 ppm. Furthermore, the p-p homogeneity of the magnetic field measured at the imaging area with a diameter of spherical volume (DSV) of 160 mm reached 8.67 ppm. In addition, we strictly controlled the residual magnetic force of the shim tray to ensure its accurate placement. The experimental results indicate that the proposed structural optimization method and the residual magnetic force control strategy show potential in high-field MRI instruments requiring high homogeneity and handling of high residual magnetic force.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"95 11","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Donepezil hydrochloride fingerprint spectral and formation mechanism analysis. 盐酸多奈哌齐指纹光谱和形成机理分析。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0225011

Lei Wang, Wenxia Wang, Dongjie Wang, Jinwu Zhao, Liu Sun, Shuocheng She, Pandeng Hou, Yizhu Zhang, Qiuhong Qu, Mingxia He

引用次数: 0

Magnetic force microscopy: High quality-factor two-pass mode. 磁力显微镜：高质量系数双通道模式

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0226633

Christopher Habenschaden, Sibylle Sievers, Alexander Klasen, Andrea Cerreta, Hans Werner Schumacher

{"title":"Magnetic force microscopy: High quality-factor two-pass mode.","authors":"Christopher Habenschaden, Sibylle Sievers, Alexander Klasen, Andrea Cerreta, Hans Werner Schumacher","doi":"10.1063/5.0226633","DOIUrl":"https://doi.org/10.1063/5.0226633","url":null,"abstract":"Magnetic force microscopy (MFM) is a well-established technique in scanning probe microscopy that allows for the imaging of magnetic samples with a spatial resolution of tens of nm and stray fields down to the mT range. The spatial resolution and field sensitivity can be significantly improved by measuring in vacuum conditions. This improvement originates from the higher quality-factor (Q-factor) of the cantilever's oscillation in vacuum compared to ambient conditions. However, while high Q-factors are desirable as they directly enhance the magnetic measurement signal, they pose a challenge when performing standard MFM two-pass (lift) mode measurements. At high Q-factors, amplitude-based topography measurements become impossible, and the MFM phase response behaves non-linearly. Here, we present a modified two-pass mode implementation in a vacuum atomic force microscope that addresses these issues. By controlling the Q-factor in the first pass and using a phase-locked loop technique in the second pass, high Q-factor measurements in vacuum are enabled. Measuring the cantilever's frequency shift instead of the phase shift eliminates the issue of emerging nonlinearities. The improvements in MFM signal-to-noise ratio are demonstrated using a nano-patterned magnetic sample. The elimination of non-linear responses is highlighted through measurements performed on a well-characterized multilayer reference sample. Finally, we discuss a technique that avoids topography-induced artifacts by following the average sample slope. The newly developed, sensitive, and distortion-free high quality-factor two-pass mode has the potential to be widely implemented in commercial setups, facilitating high-resolution MFM measurements and advancing studies of modern magnetic materials.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":"95 11","pages":""},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0