Article
Biochemical Research Methods
Xiang Hao, Edward S. Allgeyer, Dong-Ryoung Lee, Jacopo Antonello, Katherine Watters, Julianne A. Gerdes, Lena K. Schroeder, Francesca Bottanelli, Jiaxi Zhao, Phylicia Kidd, Mark D. Lessard, James E. Rothman, Lynn Cooley, Thomas Biederer, Martin J. Booth, Joerg Bewersdorf
Summary: The combination of adaptive optics with an improved isoSTED nanoscope allows imaging of cells and tissues with sub-50-nm isotropic resolution. The advanced adaptive optics strategy used in the improved nanoscope enables sub-50-nm isotropic resolution of structures such as neuronal synapses and ring canals previously inaccessible in tissue.
Article
Materials Science, Multidisciplinary
Yue Wang, Fangfang Wang, Jinhua Gao, Yutong Yan, Xuelin Wang, Xulai Wang, Chunyu Xu, Xiaoling Ma, Jian Zhang, Fujun Zhang
Summary: This study demonstrates the importance of over 200 nm thickness of active layers for efficient organic photovoltaics, with ternary thick-film OPVs showing improved performance due to optimized molecular arrangement and phase separation leading to significantly improved fill factors.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Yanan Wei, Yunhao Cai, Xiaobin Gu, Guo Yao, Zhen Fu, Yuxuan Zhu, Junfang Yang, Junpeng Dai, Jianqi Zhang, Xin Zhang, Xiaotao Hao, Guanghao Lu, Zheng Tang, Qian Peng, Chunfeng Zhang, Hui Huang
Summary: Ternary organic solar cells (OSCs) with high thickness tolerance are realized via introducing an oligomer DY-TF as the third component. Upon addition of DY-TF, the crystallinity of the host blend is improved and a well-defined morphology with vertical phase separation is formed, yielding an efficiency of 18.23%, which represents the highest efficiency value for 300 nm-thick OSCs thus far.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hai-Rui Bai, Qiaoshi An, Mengyun Jiang, Hwa Sook Ryu, Jie Yang, Xue-Jiao Zhou, Hong-Fu Zhi, Can Yang, Xiong Li, Han Young Woo, Jin-Liang Wang
Summary: By incorporating an asymmetric acceptor into binary blends, ternary organic solar cells (OSCs) were prepared. The good compatibility of two isogenous acceptors with similar chemical skeletons optimized the morphology and improved the photon absorption ability and energy level matching. The optimized ternary OSCs achieved high conversion efficiency and champion efficiency.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Ahmed Gadallah, Mohamed Hussein Eissa, Thomas Mausolf, Dietmar Kissinger, Andrea Malignaggi
Summary: This work presents a unique 300-GHz low-noise amplifier in a SiGe:C 130-nm BiCMOS technology, featuring high performance indicators suitable for high-frequency applications.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Chemistry, Physical
Adane Desta Fenta, Chun-Fu Lu, Abraha Tadese Gidey, Chin-Ti Chen
Summary: The study demonstrates that replacing PC71BM with the nonfullerene electron acceptor IT4F significantly improves the power conversion efficiency of the binary organic photovoltaic devices. In the ternary OPV system with a blending weight ratio of 1:1:0.25, the combination of PFT:IT4F:PC71BM further enhances the PCE. By finely tuning the OPV fabrication process, achieving a high PCE with devices containing a thick BHJ is possible.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Bei Shi, Sergio Pinna, Hongwei Zhao, Si Zhu, Jonathan Klamkin
Summary: Room-temperature continuous wave electrically pumped InP-based laser diodes have been successfully fabricated on CMOS-compatible Si substrates, showing potential for practical applications. Despite challenges in reliability and failure analysis for the lasers on Si, introducing a buffer layer has the potential to further enhance device performance and reliability.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Optics
B. Kraus, F. Dawel, S. Hannig, J. Kramer, C. Nauk, P. O. Schmidt
Summary: This paper reports a laser system that provides phase-stabilized UV light for an aluminum ion optical clock. The system generates over 50 μW of 267.4 nm light through frequency-quadrupling a fiber laser, and the measured phase stability supports a frequency instability of less than 5x10-17 after 1 second.
Article
Nanoscience & Nanotechnology
Sergio Gonzalez Casal, Xiaofei Bai, Kevin Alhada-Lahbabi, Bruno Canut, Bertrand Vilquin, Pedro Rojo Romeo, Solene Brottet, David Albertini, Damien Deleruyelle, Matthieu Bugnet, Ingrid Canero Infante, Brice Gautier
Summary: Mechanical switching of ferroelectric domains is achieved in PbZr0.2Ti0.8O3 thin films obtained by the sol-gel method, with a thickness of up to 200 nm, by applying a force higher than a given threshold.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Makoto Miyoshi, Mizuki Yamanaka, Takashi Egawa, Narihito Okada, Kazuyuki Tadatomo, Tetsuya Takeuchi
Summary: The metalorganic chemical vapor deposition of approximately 300-nm thick epitaxial AlInN films with different alloy compositions was carried out on a semi-relaxed c-plane GaInN template. It was observed that the morphology and microstructure of the films varied depending on the alloy composition, with a smooth surface for films grown with in-plane tensile strain and a granular morphology for films grown with in-plane compressive strain. This variation was attributed to the in-plane strain generated during growth on the GaInN template.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Analytical
Ying Zhou, Chao Ren, Shengguo Zhang, Xiaoqin Xue, Yuanyuan Liu, Jiakai Lu, Cong Ding
Summary: Remote sensing image denoising is crucial for the subsequent use and research of images. This paper proposes a second-order removal method for mixed noise in remote sensing images, which combines dilated convolution and DropoutLayer with the DnCNN network framework. Additionally, an adaptive median filtering approach is employed to further enhance the denoising result and preserve edge and texture features. Both subjective visual assessment and objective evaluation demonstrate the effectiveness of the proposed method.
Article
Automation & Control Systems
Yuan Xu, Dong Wan, Yuriy S. Shmaliy, Xiyuan Chen, Tao Shen, Shuhui Bi
Summary: This paper proposes a dual fLS-SVM assisted mcKF algorithm for INS and UWB data fusion, which reduces position errors when auxiliary measurement technologies are unavailable.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Wei-Zhi Huang, Yunshan Wang, Shih-Wei Liu, Chau-Ching Chiong, Huei Wang
Summary: This letter presents a Q-band (30-50 GHz) ultralow-power low-noise amplifier (LNA) for radio astronomical receivers in 90-nm CMOS technology. It achieves high gain and low power consumption by employing the current-reused technique and a common source stage with source degeneration for simultaneous noise and impedance matching. The measured results show that the proposed LNA has a 20.5-dB small signal gain, 26-GHz 3-dB bandwidth (25.5-51.5 GHz), the lowest in-band noise figure (NF) of 4.2 dB, and consumes only 10.1 mW power with a compact chip area of 0.6 x 1 mm(2). Despite being fabricated in 90-nm CMOS process, this LNA achieves the state-of-the-art figure of merit (FOM) compared to other advanced CMOS processes.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Ji Zhao, J. Andrew Zhang, Qiang Li, Hongbin Zhang, Xueyuan Wang
Summary: This article introduces a second-order Volterra (SOV) filter based on a recursive maximum correntropy (RMC) algorithm, and proposes two algorithms with variable forgetting factors (VFF) to enhance tracking capability. Simulation results demonstrate that the proposed algorithms outperform existing ones in impulsive noise environments and/or time-varying systems.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2022)
Article
Engineering, Electrical & Electronic
Ricardo Roriz, Andre Campos, Sandro Pinto, Tiago Gomes
Summary: The development of fully autonomous vehicles has led to a growing interest in reliable perception features, with LiDAR sensors playing a key role. However, these sensors can be sensitive to adverse weather conditions, affecting the vehicle's perception system behavior. This article proposes a weather denoising method called DIOR, which combines two state-of-the-art algorithms and utilizes FPGA technology to outperform existing solutions, improving accuracy and performance while meeting real-time requirements.
IEEE SENSORS JOURNAL
(2022)
Editorial Material
Chemistry, Physical
Steven R. Spurgeon, Colin Ophus, Lewys Jones, Amanda Petford-Long, Sergei V. Kalinin, Matthew J. Olszta, Rafal E. Dunin-Borkowski, Norman Salmon, Khalid Hattar, Wei-Chang D. Yang, Renu Sharma, Yingge Du, Ann Chiaramonti, Haimei Zheng, Edgar C. Buck, Libor Kovarik, R. Lee Penn, Dongsheng Li, Xin Zhang, Mitsuhiro Murayama, Mitra L. Taheri
Summary: Electron microscopy plays a crucial role in various aspects of modern life, including materials development for quantum computing, energy, and medicine. In order to achieve transformative discoveries in the next decade, an open, highly integrated, and data-driven microscopy architecture is essential.
Article
Materials Science, Multidisciplinary
James Haag, Danny J. Edwards, Charles H. Henager, Wahyu Setyawan, Jing Wang, Mitsuhiro Murayama
Summary: Tungsten heavy alloys (WHAs) are seen as alternatives to polycrystalline tungsten for fusion reactor plasma facing components due to their balanced strength and ductility. A study on a 90W-7Ni-3Fe WHA alloy reveals that microcracking mainly occurs at tungsten grain boundaries, which are blunted and arrested by the ductile phase.
Article
Materials Science, Ceramics
Sengo Kobayashi, James M. Howe, Mitsuhiro Murayama
Summary: The study revealed the phenomena of chemical reordering and solute cluster formation in glasses during heating. The interaction between the formation of ribbon and bulk metallic glasses and solute clusters resulted in different effects during temperature increase.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Multidisciplinary Sciences
Chang-Yu Hung, Tomotsugu Shimokawa, Yu Bai, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: The study investigates the atomistic process of deformation twin nucleation at sigma 3{111} twin boundaries in UFG high manganese TWIP steel. It was found that the formation of disconnection on sigma 3{111} twin boundaries is associated with the motion of Shockley partial dislocations on the boundaries, acting as preferential nucleation sites for deformation twin nucleation.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Masaki Mito, Narimichi Mokutani, Hiroki Tsuji, Yongpeng Tang, Kaname Matsumoto, Mitsuhiro Murayama, Zenji Horita
Summary: In this study, the researchers explored new superconductors with higher transition temperatures (Tc) in the Al-Mg-Ti ternary system. They utilized high-pressure torsion (HPT) to produce superconducting states and discovered superconductivity with Tc of 4.0 and 7.3 K. Machine learning predictions supported the appearance of magnetic anomalies at around 55 K and 93 K, indicating the importance of Al-Ti oxides in the manifestation of these anomalies, with the addition of Mg being less effective.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
J. V. Haag, J. Wang, D. J. Edwards, W. Setyawan, M. Murayama
Summary: A combination of electron backscattered diffraction and transmission electron microscopy was used to study the effects of purposefully introduced anisotropy in a tungsten heavy alloy through hot-rolling. The study focused on changes in number and proportion of various boundary types, and found that increased temperatures and longer annealing time can improve the mechanical properties of the alloy.
SCRIPTA MATERIALIA
(2022)
Article
Multidisciplinary Sciences
K. Sasaki, M. Muramatsu, K. Hirayama, K. Endo, M. Murayama
Summary: Observation of dynamic processes using transmission electron microscopy (TEM) is important for understanding nanoscale phenomena and microstructure-properties relationships. However, quantitatively evaluating the dynamic behavior of defects has been challenging due to the limitations of image interpretation and analysis. To overcome these challenges, we developed a quantitative image analysis framework that combines machine learning and particle filter estimation, enabling successful tracking and analysis of nanoscale objects.
SCIENTIFIC REPORTS
(2022)
Article
Multidisciplinary Sciences
Shiro Ihara, Hikaru Saito, Mizumo Yoshinaga, Lavakumar Avala, Mitsuhiro Murayama
Summary: This study presents an image correction framework based on deep learning for addressing distortion and noise issues in STEM image acquisition. Experimental results demonstrate that DL enables rapid and high-quality STEM image acquisition with high spatio-temporal resolution.
SCIENTIFIC REPORTS
(2022)
Article
Nanoscience & Nanotechnology
Jesada Punyafu, Sukyoung Hwang, Shiro Ihara, Hikaru Saito, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: Carbon-containing TWIP steels, which have a great strain hardening capability, suffer from serrations on the stress-strain curves, hindering their commercial development. The impact of grain size, especially in the ultrafine-grained range, and its orientation on the serrations and plastic deformation mechanism has been overlooked. This study compared the plastic deformation behavior in fine-grained and ultrafine-grained specimens and found a change in the dominant deformation mode when the grain size was equal to or smaller than 1 μm. The alteration was strongly influenced by the grain orientation and resulted in the enhancement of strain localization and the inhibition of serrations in the ultrafine-grained specimens.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Multidisciplinary Sciences
J. V. Haag, J. Wang, K. Kruska, M. J. Olszta, C. H. Henager, D. J. Edwards, W. Setyawan, M. Murayama
Summary: Tungsten heavy alloys are being studied as plasma facing material components in nuclear fusion reactors. In this study, a 90W-7Ni-3Fe alloy was used to create a multiphase brick-and-mortar structure, inspired by the strength and stiffness of mollusks. The high-resolution structural and chemical characterization techniques revealed chemically diffuse phase boundaries with unexpected lattice coherency, contributing to the high strength and toughness of tungsten heavy alloys.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Shuhei Yoshida, Jesada Punyafu, Shiro Ihara, Yan Chong, Hikaru Saito, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: The study focuses on the influence of grain size and temperature on the mechanical properties of equiatomic FeCoNi alloy. Different grain sizes ranging from ultra-fine to coarse were achieved by high-pressure torsion and annealing. The results show that the tensile yield strength is affected by temperature and grain size, and the grain boundary strength remains constant while the friction stress increases at lower temperature. At cryogenic temperature, the presence of nano twinning contributes to the enhancement of strength and ductility in addition to dislocation slip.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Shiro Ihara, Mizumo Yoshinaga, Hiroya Miyazaki, Kota Wada, Satoshi Hata, Hikaru Saito, Mitsuhiro Murayama
Summary: The in situ observation of thermally activated solid reactions in nanoparticles has been achieved using electron microscopy combined with electron tomography. The study revealed a negative correlation between neck growth and particle distance, and succeeded in reducing the electron dose and preventing interference from oxidation and other artifacts.
