Article
Materials Science, Multidisciplinary
Hyeongjin Jo, Yonghyeon Bae, Yujun Song, Jeongmok Han, Ji-Hyeon Song
Summary: This paper proposes a multimode sensor with three modes to detect and differentiate clockwise and counterclockwise twisting motions as well as stretching. The sensor consists of piezoelectric and piezoresistive sensors with a yarn-type functional structure and a stretchable substrate. It can distinguish forces exerted on it through different voltage and resistance change responses. The authors also constructed a human neck tracking system with this multimode sensor.
APPLIED MATERIALS TODAY
(2023)
Article
Chemistry, Multidisciplinary
Sarah E. Ochmann, Himanshu Joshi, Ece Bueber, Henri G. Franquelim, Pierre Stegemann, Barbara Sacca, Ulrich F. Keyser, Aleksei Aksimentiev, Philip Tinnefeld
Summary: Neuronal signal transmission is associated with changes in transmembrane potential, and various methods such as optical voltage-sensing dyes and genetically encoded voltage indicators have been developed to report these changes. In this study, a DNA nanotechnology-based system was presented for membrane sensors, utilizing DNA origami to incorporate membrane targeting and voltage sensing modularly. By using fluorescence resonance energy transfer (FRET) changes, voltage-induced displacement of anionic donor units was measured, showing a FRET change of about 5% for a membrane potential change of 100 mV. This approach demonstrates potential for non-genetically encoded membrane sensors.
Article
Multidisciplinary Sciences
Martina Trahms, Larissa Melischek, Jacob F. Steiner, Bharti Mahendru, Idan Tamir, Nils Bogdanoff, Olof Peters, Gael Reecht, Clemens B. Winkelmann, Felix von Oppen, Katharina J. Franke
Summary: We investigate the ultimate limits of miniaturization by creating atomic-scale Pb-Pb Josephson junctions in a scanning tunnelling microscope. Non-reciprocal supercurrents emerge when inserting a single magnetic atom into the junction, with the preferred direction depending on the atomic species. Our results open new avenues for creating atomic-scale Josephson diodes and tuning their properties through single-atom manipulation.
Article
Chemistry, Physical
Meng Zhang, Huizu Yang, Heng Li, Lei Tong, Can Su, Kaiyue Feng, Qingguo Wang, Hui Yan, Shougen Yin
Summary: This paper presents a strain sensor based on single-crystal graphene (SCG) that exhibits high sensitivity and high light transmittance. It is capable of detecting and monitoring subtle human motions and heartbeats.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Chen Liu, Anna Wang, Chunguang Bu, Wenhui Wang, Haijing Sun
Summary: This paper introduces a human motion capture system that combines human priors and performance capture, utilizing only a single RGB-D sensor to break self-scanning constraints. The system maintains high fidelity while increasing ease of use, blending in human priors to improve model warping reliability. Extensive experiments show that the method is comfortable to use, maintains credible geometric warping, and remains free of self-scanning constraints.
Article
Engineering, Electrical & Electronic
Mengchu Fang, Toshihiko Yoshimasu
Summary: This paper presents an ultra-low-power octave-tuning voltage-controlled oscillator integrated circuit using a novel varactor that can be controlled by a single analog voltage. The proposed wideband VCO IC, incorporating this novel varactor, demonstrates a completely continuous tuning range and extremely low power consumption.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2022)
Article
Materials Science, Multidisciplinary
Yepei Mo, Xiaolong Feng, Li Zhang, Renhou Han, Rongrong Bao, Caofeng Pan
Summary: Using an optical signal for sensing strain is a promising application for tactile sensors. This study presents a Si-based quantum dot light-emitting device (QLED) array and investigates the modulation mechanism of the strain coupling effect on the electroluminescence performance. This technology is compatible with the Si-based semiconductor industry and has potential impact in electronic skin and human-machine interfaces.
NPG ASIA MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Hind Reggad, Xiaonan Jiang, Xiaohu Wu, Rajeevan Amirtharajah, Dennis Matthews, Xiaoguang Liu
Summary: This article proposes an effective method using self-injection locking (SIL) in a radar system for vital signs monitoring with minimal hardware. The method expands the idea of using a phase-locked loop (PLL) as a demodulator and a single antenna, making the system more compact. The study compares LC-based voltage-controlled oscillator (LCVCO) and ring voltage-controlled oscillator (RVCO) in terms of sensitivity for motion detection and phase noise, and shows that RVCO outperforms LCVCO in sensitivity while the phase noise difference is negligible due to small frequencies of interest.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Automation & Control Systems
Hafiz Ahmed, Samet Biricik, Hasan Komurcugil, Seifeddine Ben Elghali, Mohamed Benbouzid
Summary: This paper presents a study on the continuous terminal sliding mode controller for single-phase dynamic voltage restorers, which has faster convergence speed and less chattering compared to the first-order sliding mode counterpart. An enhanced self-tuning filter is also proposed as the reference compensation voltage generator, which is frequency-adaptive and has good filtering property.
CONTROL ENGINEERING PRACTICE
(2022)
Article
Engineering, Electrical & Electronic
Koki Taguchi, Takafumi Uemura, Andreas Petritz, Naoko Namba, Mihoko Akiyama, Masahiro Sugiyama, Teppei Araki, Barbara Stadlober, Tsuyoshi Sekitani
Summary: Flexible electronics has opened up possibilities for the development of next-generation wearable and implantable healthcare devices. This study focuses on using a photoreactive insulating polymer to modulate the power consumption and operating speed of ultraflexible organic circuits. The results demonstrate that a nanoscale interfacial photochemical reaction can enable low power consumption and tunable operating speed in organic signal processing circuits.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Yufei Yue, Qianming Xu, Peng Guo, Xu Chu, Zhikang Shuai, An Luo, Josep M. Guerrero
Summary: This paper presents a predictor-corrector approach for submodule (SM) capacitor voltage measurement in single-phase modular multilevel converter (MMC), aiming to simplify the hardware structure and improve prediction accuracy by utilizing measured voltage variations and achieving voltage-balancing of SMs. Extensive comparison simulation and experimental tests support the feasibility and effectiveness of the proposed approach for steady-state and transient performances evaluation.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Yifeng Wang, Yi Zhao
Summary: Compared with visible, infrared rays, and ultrasonic positioning technologies, portable inertial sensors can acquire signals that are not affected by external environment, making it a promising method for motion tracking. However, accurately reconstructing trajectories from inertial sensors is a challenge due to intrinsic and measurement errors, especially drift error. To address this, we propose a new method called geometric dynamic segmental reconstruction (GDSR) which treats the movement trajectory as a combination of basic trajectories.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Kyu-Young Kang, Seul-Gi Lee, Hyeon Kang, Jung-Gil Kim, Gye-Rae Tack, Jin-Seung Choi
Summary: In this study, a deep-learning model was constructed to classify a given motion based on the raw data of inertial sensors. The model's efficiency was determined by varying the number of epochs and hidden units, and the optimum accuracy and training time were found. Results showed that the highest accuracy (99.82%) was achieved with 150 hidden units and 300 epochs, while the training time was relatively short (78.15 min). The study highlights the importance of finding suitable combinations of epochs and hidden units for developing efficient deep-learning models and identifies the adverse effects of overtraining.
APPLIED SCIENCES-BASEL
(2022)
Article
Multidisciplinary Sciences
Xiaoying Xu, Yufan Li, C. L. Chien
Summary: The authors observed a transverse voltage in superconducting beta-Bi2Pd thin films, which is believed to be a result of chiral topological surface states.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Huijie Wu, Xiaojie Liu, Lifeng Feng, Haitao Yin
Summary: In this study, we investigated the modulation of spin transport in a single chromium porphyrin molecule using gate voltage and the photogalvanic effect. We found that gate voltage can effectively regulate the spin filtering effect under a certain bias voltage. Additionally, when the molecule is connected to two asymmetrically connected gold nanowire electrodes, fully polarized and even pure spin currents can be generated under the irradiation of linearly polarized light. Our findings provide potential pathways for designing single-molecule spintronics and optoelectronic devices.
