Micromachines最新文献_第6页

Scattering Theory in an N-Pole Semiconductor Quantum Device: The Unitarity of the Current S-Matrix and Current Conservation.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-05 DOI: 10.3390/mi16030306

Jan Kučera, Ulrich Wulf, George Alexandru Nemnes

{"title":"Scattering Theory in an N-Pole Semiconductor Quantum Device: The Unitarity of the Current S-Matrix and Current Conservation.","authors":"Jan Kučera, Ulrich Wulf, George Alexandru Nemnes","doi":"10.3390/mi16030306","DOIUrl":"10.3390/mi16030306","url":null,"abstract":"In a number of previous publications, scattering theory for N-pole semiconductor quantum devices was developed. In the framework of the Landauer-Büttiker formalism, an S-matrix was constructed with the aid of an R-matrix providing a mapping of the in-going waves onto the out-going waves. These waves include propagating waves and evanescent waves, the latter of which decay exponentially in the leads which are connected to the active region of the N-pole device. In order to formulate the current conservation in the N-pole device, it is necessary to define the current S-matrix schematically as S˜=k1/2Sk-1/2, where k contains the information about the k-vectors of the mentioned in- and out-going waves. In this paper, we show how the complete current S-matrix is calculated including the coupling between the propagating and evanescent components and coupling to the bound states in the active device region. One then finds a sub-matrix of S˜ which is unitary and which is restricted to the space of the propagating components. We demonstrate that current conservation is associated with the unitarity just of this sub-matrix.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11945349/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Maximum Correntropy Criterion Kalman/Allan Variance-Assisted FIR Integrated Filter for Indoor Localization.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-04 DOI: 10.3390/mi16030303

Manman Li, Lei Deng, Yide Zhang, Yuan Xu, Yanli Gao

{"title":"Maximum Correntropy Criterion Kalman/Allan Variance-Assisted FIR Integrated Filter for Indoor Localization.","authors":"Manman Li, Lei Deng, Yide Zhang, Yuan Xu, Yanli Gao","doi":"10.3390/mi16030303","DOIUrl":"10.3390/mi16030303","url":null,"abstract":"To obtain more accurate information on using an inertial navigation system (INS)-based integrated localization system, an integrated filter with maximum correntropy criterion Kalman filter (mccKF) and finite impulse response (FIR) is proposed for the fusion of INS-based multisource sensor data in this work. In the realm of medical applications, precise localization is crucial for various aspects, such as tracking the movement of a medical instrument within the human body or monitoring its position in the human body during procedures. This study uses ultra-wideband (UWB) technology to rectify the position errors of the INS. In this method, the difference between the positions of the INS and UWB is used as the measurement of the filter. The main data fusion filter in this study is the mccKF, which utilizes the maximum correntropy criterion (mcc) method to enhance the robustness of the Kalman filter (KF). This filter is used for fusing data from multiple sources, including the INS. Moreover, we use the Mahalanobis distance to verify the performance of the mccKF. If the performance of the mccKF is lower than the preset threshold, the Allan Variance-assisted FIR filter is used to replace the mccKF, which is designed in this work. This adaptive approach ensures the resilience of the system in demanding medical environments. Two practical experiments were performed to evaluate the effectiveness of the proposed approach. The findings indicate that the mccKF/FIR integrated method reduces the localization error by approximately 32.43% and 37.5% compared with the KF and mccKF, respectively. These results highlight the effectiveness of the proposed approach.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11946001/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Misalignment in Mechanical Interlocking Heterogeneous Integration: Emergent Behavior and Geometry Optimization.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-04 DOI: 10.3390/mi16030305

Matthew Nakamura, Corrisa Heyes, Ethan Rocheville, Kirsten Peterson, Joseph J Brown

{"title":"Misalignment in Mechanical Interlocking Heterogeneous Integration: Emergent Behavior and Geometry Optimization.","authors":"Matthew Nakamura, Corrisa Heyes, Ethan Rocheville, Kirsten Peterson, Joseph J Brown","doi":"10.3390/mi16030305","DOIUrl":"10.3390/mi16030305","url":null,"abstract":"This paper addresses the challenge of misalignment in cantilever-based mechanical interlocking structures used for the heterogeneous integration of integrated circuits (ICs). As IC applications expand into flexible and multi-functional platforms, precise alignment becomes critical to maintaining optimal mechanical and electrical performance. We investigate the effects of X and Y misalignment on snap-through forces in cantilever arrays, focusing on their impact on mechanical integrity. The experimental results demonstrate that for X-axis misalignments below 15%, the increase in the required snap-through force is less than 5%. In contrast, Y-axis misalignment shows an even more negligible impact, with less than a 5% reduction in force for up to 20% misalignment. Additionally, through polynomial fits of the model across a range of cantilever angles, this study provides a design template for future exploration of cantilever interactions using nonlinear mechanics while minimizing computational load. These findings offer valuable insights for optimizing misalignment tolerance and improving the design of interlocking structures for IC integration, contributing to the development of robust systems for next-generation IC devices.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11945119/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Integration of Artificial Intelligence with Micro-Nano-Systems: Perspectives, Challenges and Future Prospects.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-04 DOI: 10.3390/mi16030301

Juvenal Rodríguez-Reséndiz, Marcos Aviles, José M Álvarez-Alvarado

引用次数: 0

Gallium Nitride High Electron Mobility Transistor Device with Integrated On-Chip Array Junction Temperature Monitoring Unit.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-04 DOI: 10.3390/mi16030304

Yukuan Chang, Yue Su, Mingke Xiao, Jiatao Wu, Xu Zhang, Hongda Chen

引用次数: 0

Experimental Study on Ultrasonic Vibration-Assisted Grinding of SiCp/Al Composites Grinding.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-04 DOI: 10.3390/mi16030302

Jinghao Jin, Jian Mao, Rong Wang, Mengyang Cui

{"title":"Experimental Study on Ultrasonic Vibration-Assisted Grinding of SiCp/Al Composites Grinding.","authors":"Jinghao Jin, Jian Mao, Rong Wang, Mengyang Cui","doi":"10.3390/mi16030302","DOIUrl":"10.3390/mi16030302","url":null,"abstract":"Aluminum matrix composites reinforced with silicon carbide particles (SiCp/Al) are widely used in aerospace fields with excellent properties, such as high specific strength, high specific stiffness, and high thermal conductivity. Due to the heterogeneous structure, its microstructure is one of the determinants of workpiece life, and ultrasonic vibration can improve the surface quality after grinding. Therefore, in this study, ultrasonic vibration-assisted grinding (UVAG) orthogonal tests were designed to study the surface morphology of SiCp/Al and the form of SiC particle removal under different machining parameters based on the SEM observation of the material surface, and to analyze the percentage of different kinds of grinding forces. The results show that the existence of particle fracture force depends on the relative sizes of the maximum undeformed chip thickness and the critical chip thickness. Through surface roughness testing and analysis, the influence of processing parameters on the surface roughness of the material is explored, and it is found that the application of ultrasound reduces the surface roughness of the material, which can be used as a guideline for the surface quality of the grinding process and the optimization of the process parameters.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11944895/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Applications and Recent Advances of Low-Temperature Multicomponent Solders in Electronic Packaging: A Review.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-03 DOI: 10.3390/mi16030300

Guodong Wu, Jingfang Shen, Ding Zhou, Muhammad Khairi Faiz, Yew Hoong Wong

引用次数: 0

Transforming Drug Discovery with Miniaturized Predictive Tissue Models.

IF 3 3区工程技术

Micromachines Pub Date : 2025-03-03 DOI: 10.3390/mi16030299

Mohsen Akbari

引用次数: 0

Demonstration of Pattern Size Effects on Hydrophobic Nanocellulose Coatings with Regular Micron-Sized Island-like Geometrical Domains Created by Femtosecond Laser Micromachining.

IF 3 3区工程技术

Micromachines Pub Date : 2025-02-28 DOI: 10.3390/mi16030289

Pieter Samyn, Patrick Cosemans, Olivier Malek

{"title":"Demonstration of Pattern Size Effects on Hydrophobic Nanocellulose Coatings with Regular Micron-Sized Island-like Geometrical Domains Created by Femtosecond Laser Micromachining.","authors":"Pieter Samyn, Patrick Cosemans, Olivier Malek","doi":"10.3390/mi16030289","DOIUrl":"10.3390/mi16030289","url":null,"abstract":"As inspired by nature, wettability of bio-based material surfaces can be controlled by combining appropriate surface chemistries and topographies mimicking the structure of plant leaves or animals. The need for bio-based nanocellulose coatings with enhanced hydrophobic properties becomes technically relevant for extending their applications in the technological domain with better protection and lifetime of the coatings. In this work, the water repellence of spray-coated nanocellulose coatings with hydrophobically modified cellulose microfiber (mCMF coatings), or hydrophobically modified cellulose nanofiber (mCNF coatings) was enhanced after femtosecond laser patterning. In particular, the influences of different island-like pattern geometries and pattern sizes were systematically studied. The island-like patterns were experimentally created with single posts that have variable sizes of the valleys (B = 30 to 15 µm) and top surface area (T = 120 to 15 µm), resulting in good resolution of the patterns down to the size of the laser beam diameter (15 µm). Depending on the intrinsic homogeneity and porosity of sprayed mCMF and mCNF coatings, the quality and resolution of the island-like patterns is better for the mCNF coatings with thinner and more homogeneous sizes of the cellulose nanofibrils. The increase in apparent water contact angle on patterned nanocellulose coatings can be estimated from the theoretical Cassie-Baxter state of wetting and shows maximum values up to θs = 128° (mCMF coatings), or θs = 140° (mCNF coatings), for the smallest pattern sizes in parallel with minimum contact angle hysteresis of Δθ = 14° (mCMF coatings), or Δθ < 9° (mCNF coatings). The study demonstrated that femtosecond laser patterning technology provides high flexibility and adaptivity to create surface patterns in appropriate dimensions with enhanced hydrophobicity of nanocellulose coatings.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 3","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11946676/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143720224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of a Compact Unified SIW Cavity Filtenna Module for Antenna Array Application.

IF 3 3区工程技术

Micromachines Pub Date : 2025-02-28 DOI: 10.3390/mi16030285

Andrey Altynnikov, Roman Platonov, Alexey Sosunov, Tatyana Legkova, Andrey Komlev, Andrey B Kozyrev

引用次数: 0