Communications engineering最新文献_第2页

Maximizing wireless power transfer efficiency at exceptional points. 最大限度地提高无线电力传输效率在特殊点。

Communications engineering Pub Date : 2025-06-10 DOI: 10.1038/s44172-025-00445-y

Wei-Kang Hu, Bowang Zhang, Youhao Hu, Haoxiang Li, Wei Han

{"title":"Maximizing wireless power transfer efficiency at exceptional points.","authors":"Wei-Kang Hu, Bowang Zhang, Youhao Hu, Haoxiang Li, Wei Han","doi":"10.1038/s44172-025-00445-y","DOIUrl":"10.1038/s44172-025-00445-y","url":null,"abstract":"Magnetically coupled wireless power transfer (WPT) technology has been applied in stationary consumer electronics and holds great potential for charging traveling electric vehicles. The efficiency of WPT systems is, however, inherently vulnerable to changes in coupling and load conditions. Previous studies have underscored the robustness of parity-time (PT) symmetric WPT systems against variations in coupling strength within the exact PT region. In this study, by treating the loss rate as an adjustable parameter, we unveil that the efficiency of a PT-symmetric WPT system reaches its peak at the exceptional point (EP). Through adaptive adjustment of the virtual loss rate that pins the system at the EP, we can uphold maximum-efficiency, frequency-stable power transfer under a broad range of coupling and load conditions. Our EP-pinning strategy offers a significant advantage over conventional schemes that require on-site measurement of coupling strength and loss rates. The discovery of EP-induced efficient power transfer should facilitate the future deployment of wireless charging infrastructure.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"105"},"PeriodicalIF":0.0,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12152173/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144267991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Active heterogeneous mode coupling in bi-level multi-physically architected metamaterials for temporal, on-demand and tunable programming. 双能级多物理结构超材料中的主动异构模式耦合，用于时间、按需和可调编程。

Communications engineering Pub Date : 2025-06-07 DOI: 10.1038/s44172-025-00420-7

S Mondal, T Mukhopadhyay, S Naskar

{"title":"Active heterogeneous mode coupling in bi-level multi-physically architected metamaterials for temporal, on-demand and tunable programming.","authors":"S Mondal, T Mukhopadhyay, S Naskar","doi":"10.1038/s44172-025-00420-7","DOIUrl":"10.1038/s44172-025-00420-7","url":null,"abstract":"Traditionally materials show an uncoupled response between normal and shear modes of deformation. Here we propose to achieve heterogeneous mode coupling among the normal and shear modes, but in conventional symmetric lattice geometries through intuitively mounting electro-active elements. The proposed bi-level multi-physically architected metamaterials lead to an unprecedented programmable voltage-dependent normal-shear constitutive mode coupling and active multi-modal stiffness modulation capability for critically exploitable periodic or aperiodic, on-demand and temporally tunable mechanical responses. Further, active partial cloaking concerning the effect of far-field complex stresses can be achieved, leading to the prospect of averting a range of failure and serviceability conditions. The tunable heterogeneous mode coupling in the new class of symmetric metamaterials would lead to real-time control of mechanical responses for temporal programming in a wide range of advanced mechanical applications, including morphing and transformable geometries, locomotion in soft robotics, embedded actuators, enhanced multi-modal energy harvesting, vibration and wave propagation control.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"103"},"PeriodicalIF":0.0,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12145453/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144251121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Powered knee exoskeleton improves sit-to-stand transitions in stroke patients using electromyographic control. 动力膝关节外骨骼改善中风患者使用肌电图控制坐姿到站立的转变。

Communications engineering Pub Date : 2025-06-07 DOI: 10.1038/s44172-025-00440-3

Andrew J Gunnell, Sergei V Sarkisian, Heather A Hayes, K Bo Foreman, Lukas Gabert, Tommaso Lenzi

{"title":"Powered knee exoskeleton improves sit-to-stand transitions in stroke patients using electromyographic control.","authors":"Andrew J Gunnell, Sergei V Sarkisian, Heather A Hayes, K Bo Foreman, Lukas Gabert, Tommaso Lenzi","doi":"10.1038/s44172-025-00440-3","DOIUrl":"10.1038/s44172-025-00440-3","url":null,"abstract":"Millions of stroke survivors are affected by hemiparesis, resulting in difficulty or inability to move one side of their body. Hemiparesis severely impacts the ability of individuals to perform essential everyday activities, reducing independence and quality of life. Here we show that a powered knee exoskeleton that assists the affected knee joint using proportional electromyographic control significantly improves the ability to stand up from a seated position in eight stroke survivors. With the exoskeleton, stroke survivors stood up significantly faster (8.8% reduction in stand-up time), more symmetrically (13.7% increase in weight-bearing symmetry), and with less effort on their affected side (32% reduction in peak quadriceps muscle activation, 25% reduction in peak biological torque generation). The exoskeleton effectively supplemented the lack of strength in their affected knee, increasing the total knee torque by 59%, which more closely matched their non-affected knee. These results suggest that powered knee exoskeletons are a promising solution for enhancing stand-up ability, improving symmetry, reducing effort, and ultimately enhancing stroke survivors' mobility and quality of life.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"104"},"PeriodicalIF":0.0,"publicationDate":"2025-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12145452/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144251122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

3D transcranial ultrasound localization microscopy in awake mice: protocol and open-source pipeline. 清醒小鼠的三维经颅超声定位显微镜：方案和开源管道。

Communications engineering Pub Date : 2025-06-06 DOI: 10.1038/s44172-025-00415-4

Georges Chabouh, Louise Denis, Myriam Abioui-Mourgues, Jean-Baptiste Deloges, Jacques Battaglia, Arthur Chavignon, Baptiste Heiles, Basile Pradier, Sylvain Bodard, Denis Vivien, Cyrille Orset, Olivier Couture

引用次数: 0

Rapid in-air ultrasound holography measurement and camera-in-the-loop generation using thermography. 快速空中超声全息测量和热成像在环相机生成。

Communications engineering Pub Date : 2025-06-05 DOI: 10.1038/s44172-025-00439-w

Zak Morgan, Youngjun Cho, Sriram Subramanian

{"title":"Rapid in-air ultrasound holography measurement and camera-in-the-loop generation using thermography.","authors":"Zak Morgan, Youngjun Cho, Sriram Subramanian","doi":"10.1038/s44172-025-00439-w","DOIUrl":"10.1038/s44172-025-00439-w","url":null,"abstract":"Ultrasound holography, pivotal in applications like mid-air haptics, volumetric displays and 3D printing, faces challenges in the crafting and timely measurement of precise acoustic holograms. Current methods, bench-marked via simulations due to slow measurement times, often neglect real-world complexities such as non-linearity and hardware tolerances, leading to discrepancies between predicted and observed results. Here we introduce a real-time 2D thermographic measurement technique orders of magnitude faster than microphone scans, although with reduced accuracy and no phase information, with a maximum peak pressure of 4.25 kPa validated and a demonstrated average accuracy of 2.5% in peak measurement. Higher pressures of approximately 12 kpa were captured, but validation was limited by the microphone. This method is grounded in thermo-viscous acoustic models for thin-ducts and micro-perforated plates. Finally, we integrate this with holography algorithms to propose a camera-in-the-loop algorithm that employs real-time measurement, enabling targeted data acquisition and on-line training of acoustic holography algorithms. This method achieved a 1.7% error in pressure with a single point compared to 7.8% for a conventional algorithm, and a 3.6% error and 4.2% standard deviation for 16 points compared to 9.7% and 6.9%. We further envisage this method as being capable of measuring acoustic streaming.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"101"},"PeriodicalIF":0.0,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12141450/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144236017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Data-intelligence driven methods for durability, damage diagnosis and performance prediction of concrete structures. 混凝土结构耐久性、损伤诊断和性能预测的数据智能驱动方法。

Communications engineering Pub Date : 2025-06-03 DOI: 10.1038/s44172-025-00431-4

Fan Li, Daming Luo, Ditao Niu

{"title":"Data-intelligence driven methods for durability, damage diagnosis and performance prediction of concrete structures.","authors":"Fan Li, Daming Luo, Ditao Niu","doi":"10.1038/s44172-025-00431-4","DOIUrl":"10.1038/s44172-025-00431-4","url":null,"abstract":"A large number of in-service reinforced concrete structures are now entering the mid-to-late stages of their service life. Efficient detection of damage characteristics and accurate prediction of material performance degradation have become essential for ensuring the safety of these structures. Traditional damage detection methods, which primarily rely on manual inspections and sensor monitoring, are inefficient and lack accuracy. Similarly, performance prediction models for reinforced concrete materials, which are often based on limited experimental data and polynomial fitting, oversimplify the influencing factors. In contrast, partial differential equation models that account for degradation mechanisms are computationally intensive and difficult to solve. Recent advancements in deep learning and machine learning, as part of artificial intelligence, have introduced innovative approaches for both damage detection and material performance prediction in reinforced concrete structures. This paper provides a comprehensive overview of machine learning and deep learning theories and models, and reviews the current research on their application to the durability of reinforced concrete structures, focusing on two main areas: intelligent damage detection and predictive modeling of material durability. Finally, the article discusses future trends and offers insights into the intelligent innovation of concrete structure durability.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"100"},"PeriodicalIF":0.0,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12134258/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144217699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acoustic hologram-enabled simultaneous multi-target blood-brain barrier opening (AH-SiMBO). 声全息图同时开启多靶点血脑屏障（AH-SiMBO）。

Communications engineering Pub Date : 2025-06-02 DOI: 10.1038/s44172-025-00428-z

Xinya Yao, Xiangkun Piao, Shulong Hong, Chenyu Ji, Mingyu Wang, Yan Wei, Zhouyang Xu, Jia-Ji Pan, Yanbo Pei, Bingbing Cheng

{"title":"Acoustic hologram-enabled simultaneous multi-target blood-brain barrier opening (AH-SiMBO).","authors":"Xinya Yao, Xiangkun Piao, Shulong Hong, Chenyu Ji, Mingyu Wang, Yan Wei, Zhouyang Xu, Jia-Ji Pan, Yanbo Pei, Bingbing Cheng","doi":"10.1038/s44172-025-00428-z","DOIUrl":"10.1038/s44172-025-00428-z","url":null,"abstract":"Focused ultrasound-induced blood-brain barrier (BBB) opening enables targeted brain drug delivery. However, achieving simultaneous multi-target BBB opening across various depths and regions remains challenging and cost-prohibitive. Here we address these challenges by employing encoded acoustic holograms combined with a single-element plane-wave transducer to generate precise focused acoustic fields. The holograms designed using an iterative angular spectrum approach and fabricated via 3D printing produce single or multiple foci at different depths and regions, which are confirmed by simulations and hydrophone-based measurements. Beam steering capability is demonstrated and further validated in vivo. We design a hologram with less than 10% variation in amplitude across different foci and successfully achieve biplane multi-target ( ≥3) BBB opening in the bilateral hippocampus and medial septum of mice in a single sonication session with no adverse effects. This innovative acoustic holographic approach for simultaneous multi-target BBB opening is time-efficient and cost-effective, presenting broad potential applications in brain drug delivery and neuromodulation.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"99"},"PeriodicalIF":0.0,"publicationDate":"2025-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12130547/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144210330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A polymer-based MEMS loudspeaker featuring a partially stiffened membrane actuated by a PZT thin film. 一种基于聚合物的MEMS扬声器，具有由PZT薄膜驱动的部分加强膜。

Communications engineering Pub Date : 2025-05-29 DOI: 10.1038/s44172-025-00438-x

Romain Liechti, Christel Dieppedale, Timothée Rotrou, Gwenaël Le Rhun

{"title":"A polymer-based MEMS loudspeaker featuring a partially stiffened membrane actuated by a PZT thin film.","authors":"Romain Liechti, Christel Dieppedale, Timothée Rotrou, Gwenaël Le Rhun","doi":"10.1038/s44172-025-00438-x","DOIUrl":"10.1038/s44172-025-00438-x","url":null,"abstract":"Miniaturized loudspeakers are increasingly relevant for wearable and transparent electronics, but achieving consistent acoustic performance, particularly at low frequencies, remains a challenge. Here we show a polymer-based loudspeaker that features a partially stiffened membrane actuated by a transferred thin film of lead zirconate titanate. The flexible polymer reduces overall stiffness, while the localized stiffening broadens the frequency response. The piezoelectric film is integrated through a transfer process that employs a donor substrate. We evaluate functionality through electrical, mechanical, acoustic, and optical measurements, including sound pressure level and resonance frequency, in both open field and in-ear conditions. The results confirm the device's ability to operate under different acoustic loads and demonstrate compatibility of the fabrication process with flexible and transparent substrates. This approach enables the integration of transparent piezoelectric actuators and is suitable for compact, bendable, and optically transparent audio systems.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"98"},"PeriodicalIF":0.0,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12122854/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144180468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexible screen-printed sic-based humidity sensors. 柔性丝网印刷硅基湿度传感器。

Communications engineering Pub Date : 2025-05-27 DOI: 10.1038/s44172-025-00425-2

Arjun Wadhwa, Alexandre Perrotton, Mohamad Hassan Taherian, Abbas Zirakjou, Jaime Benavides-Guerrero, Mathieu Gratuze, Fabrice Vaussenat, Martin Bolduc, Sylvain G Cloutier

{"title":"Flexible screen-printed sic-based humidity sensors.","authors":"Arjun Wadhwa, Alexandre Perrotton, Mohamad Hassan Taherian, Abbas Zirakjou, Jaime Benavides-Guerrero, Mathieu Gratuze, Fabrice Vaussenat, Martin Bolduc, Sylvain G Cloutier","doi":"10.1038/s44172-025-00425-2","DOIUrl":"10.1038/s44172-025-00425-2","url":null,"abstract":"Humidity sensors are essential components in modern technology, spanning applications from residential appliances to the Internet of Things (IoT). However, conventional commercial sensors are typically rigid, constrained by narrow relative humidity (%RH) operating ranges, and require complex fabrication processes. In this study, we present a highly sensitive cubic silicon carbide (3C-SiC) nanoparticle-based relative humidity sensor, fabricated via serigraphic printing on to 5 mil thick flexible polyimide (Kapton®) substrate. Devices are tested across a broad humidity range of 10-90%RH at ambient temperature and their performance is evaluated in a controlled humidity chamber. The sensor exhibits a robust response of 45.2% R/R0, with a sensitivity of 5.34 Ω/%RH, an adsorption time of 18 seconds, and a desorption time of 46 seconds. Additionally, the device demonstrates low hysteresis of 6.5% at 60%RH, with excellent repeatability and stability over 3.5 hours of continuous cycling. To showcase their potential for real-world applications, the printed sensors are integrated into a commercial KN95 mask for monitoring respiration parameters, such as respiration rate. This integration highlights the potential for future exploration in human health monitoring, utilizing fully printed, low-cost sensing devices.","PeriodicalId":72644,"journal":{"name":"Communications engineering","volume":"4 1","pages":"96"},"PeriodicalIF":0.0,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12117086/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144164040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

What makes a great engineering paper? Editorial insights into impact. 是什么造就了一篇优秀的工程论文？编辑对影响力的见解。

Communications engineering Pub Date : 2025-05-27 DOI: 10.1038/s44172-025-00433-2

引用次数: 0