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Microstructural Evolution and Mechanical Properties of Nb-Containing Medium-Mn Low-density Steels

STEEL rESEArCH INTErNATIONAL 2025年第1期96卷

作者： Ma, Chen Zhang, Jianlei An, Fenghui Chen, Gang Zhou, Junye Song, Changjiang Zhai, Qijie Shanghai Univ Ctr Adv Solidificat Technol CAST Sch Mat Sci & Engn Shanghai 200444 Peoples R China Shanghai Univ Shanghai Engn Res Ctr Integrated Circuits & Adv D Shanghai 200444 Peoples R China Jiujiang Univ Jiujiang Engn Res Ctr Adv Welding Jiujiang 332005 Peoples R China Chinese Acad Ordnance Sci Ningbo Branch Ningbo 315103 Peoples R China

Microalloying of Nb has been commonly utilized to enhance the structure and mechanical properties of advanced high-strength steel (AHSS), but its application in medium-Mn low-density steel has been relatively understudied. This study aims to investigate the evolution of nano-scale precipitates and mechanical properties of Fe-12Mn-9Al-3Cr-1.4C-0.02/0.04Nb low-density steels. The findings reveal that the austenite grain size of 0.04Nb steels is approximately half that of 0.02Nb steels due to the precipitation of NbC particles. Moreover, the addition of Nb is found to elevate the formation energy of kappa-carbide, thereby impeding its growth and coarsening. Consequently, the intragranular kappa-carbides in 0.04Nb steels are consistently smaller than those in 0.02Nb steels, with no coarsened intergranular kappa-carbides detected in either steel variant after aging treatment at 723-823K. despite a slight reduction on precipitation strengthening of kappa-carbides with higher Nb content, the yield strength of 0.04Nb steels exceeds that of 0.02Nb steels by approximate to 71MPa, mainly due to additional fine grain strengthening and dislocation strengthening. The strengthening mechanisms in the Nb-containing low-density steels are analyzed quantitatively. The role of Nb in regulating the microstructure and mechanical properties of medium-Mn low-density steels is comprehensively discussed, offering valuable insights for the alloy design of low-density steel.

关键词： low-density steel mechanical properties nano-precipitation behavior Nb addition

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Impact of pump power on Lyot filtering effect in mode-locked fiber lasers

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CHAOS SOLITONS & FrACTALS 2025年 191卷

作者： Zhou, Luyao Liu, Lie Han, Ying Wen, Honglin Li, Yingying Li, Qi Ma, Chunyang Wu, Ge Gao, Bo Jilin Univ Coll Commun Engn Changchun 130012 Peoples R China Peng Cheng Lab Res Ctr Circuits & Syst Shenzhen 518055 Peoples R China Jilin Univ Coll Elect Sci & Engn Changchun 130012 Peoples R China Shenzhen Univ Inst Microscale Optoelect Int Collaborat Lab 2D Mat Optoelect Sci & Technol Minist Educ Shenzhen 518060 Peoples R China

Filtering effects, which can achieve multi-wavelength in mode-locked fiber lasers, are currently being investigated, including communications and industry. In this study, we systematically investigate the impact of pump power on the operation of the filter in mode-locked fiber lasers. An all-normal dispersion ytterbium-doped fiber laser was employed to investigate hybrid filtering structures combining a Lyot filter and a nonlinear optical loop mirror (NOLM), both experimentally and theoretically. Furthermore, we identified a specific pump power range, from 570.5 mW to 748.9 mW, within which the Lyot filter operates effectively, facilitating transitions between single- and multi-wavelength outputs. We theoretically explain how pump power governs the operational state of the Lyot filter, enabling precise control over spectral modulation. This work demonstrates the influence of power on filtering and presents a versatile nonlinear system for generating and analyzing multi-wavelengths, facilitating the optimization and customization of the output spectrum.

关键词： Hybrid filter Mode-locked fiber laser Filter effect Multi-wavelength Soliton Power

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Overtone Mass Sensitivity of Quartz Crystal Microbalance Sensor with Asymmetric N-M Type Electrode Configuration

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ANALYTICAL CHEMISTrY 2023年第8期95卷 4043-4049页

作者： Hu, Jianguo Yesilbas, Goektug Li, Yuanyuan Geng, Xiangshun Chen, Jing Wu, Xiaoming Knoll, Alois ren, Tian-Ling Tech Univ Munich Inst Informat 6 D-85748 Munich Germany Tsinghua Univ Beijing Natl Res Ctr Informat Sci & Technol BNRist Beijing 100084 Peoples R China Tsinghua Univ Sch Integrated Circuits Beijing 100084 Peoples R China

Sensing sensitivity is one of the crucial parameters for quartz crystal microbalance (QCM) sensors. Herein, we study the overtone mass sensitivity of a QCM sensor with an asymmetric N-M type electrode configuration. In order to overcome the deficiency that the sensitivity of the QCM sensor with an asymmetric electrode cannot be calculated by Sauerbrey's equation, we design the electrochemical electrodeposition experiments to measure it. The measurement results of overtone mass sensitivities of three 3.1-5.1 and three 4.1-5.1 QCMs are 5.418, 5.629, and 5.572 Hz/ng and 4.155, 4.456, and 3.982 Hz/ng in the third overtone mode and 9.208, 9.474, and 9.243 Hz/ng and 6.811, 7.604, and 6.588 Hz/ng in the fifth overtone mode, respectively. The overtone mass sensitivities of three 5.1-5.1 QCMs are 3.210, 3.439, and 3.540 Hz/ng in the third overtone mode and 5.396, 5.010, and 5.707 Hz/ng in the fifth overtone mode, respectively. These results show that the overtone mass sensitivity of the N-M type QCM is larger than that of QCMs with symmetric electrodes, and the fifth overtone mass sensitivity is higher than the third overtone mass sensitivity for the same type of QCM. The above results strongly confirm that the overtone mass sensitivity of a QCM sensor with an asymmetric N-M electrode structure significantly enhances its sensing performance, and it will greatly meet the demands for high precision measurement of QCM sensors in applications.

关键词： Quartz

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A flexible magnetic dNA biosensor composed of AgNWs/hydrogel/PS/Fe3O4 for the detection of ASFV P72 protein gene fragment

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MICrOCHIMICA ACTA 2025年第4期192卷 1-10页

作者： Xue, Mengjie Sang, Shengbo Zhao, dong duan, Qianqian Guo, Xing Taiyuan Univ Technol Coll Integrated Circuits Shanxi Key Lab Micro Nano Sensors & Artificial Int Taiyuan 030024 Peoples R China Taiyuan Univ Technol Key Lab Adv Transducers & Intelligent Control Syst Minist Educ Taiyuan 030024 Peoples R China Shanxi Res Inst 6D Artificial Intelligence Biomed Taiyuan 030024 Peoples R China

African swine fever virus (ASFV) is a highly infectious and pathogenic dNA virus with a mortality rate of nearly 100%. Here, we developed a flexible biosensor based on a AgNWs/hydrogel/PS(polystyrene)/Fe3O4 composite film for the detection of ASFV P72 protein gene fragments. A large number of carboxyl groups in the hydrogel provide modification sites for capture probes (cp) simplifying the preparation process of the biosensor. Combined with the excellent magnetic properties of Fe3O4, the excellent electrical conductivity of silver nanowires (AgNWs) and the unique optical properties of two-dimensional photonic crystals (2dPC), the flexible biosensor can convert biological signals into optical signals and electrical signals, and the micro-deformation of the film can be verified by simple optical methods. In order to improve the sensitivity, we introduce Fe3O4 and apply an external magnetic field to amplify the thin film micro-deformation. The concentration of P72 protein gene fragment and the relative change rate of resistance showed a good linear relationship, and the linear equation is y = - 0.00126x - 0.31729;the detection limit (LOd) is as low as 0.208 mu M. The composite film was used to detect real serum samples, and the recovery of the composite film fluctuated in the range 91.89 to 103.19%, indicating that the composite film has practical application potential in clinical detection of ASFV. In addition, the biosensor also shows good biocompatibility, stability, and specificity.

关键词： dNA biosensor Nanomaterials Flexible thin film ASFV P72 detection relative resistance detection

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Fabrication of 45-degree Integrated Mirrors for Three-dimensional Board-Level Optical Interconnects realizing Efficient Light Coupling 24

Fabrication of 45-Degree Integrated Mirrors for Three-Dimens...

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24th International Conference on Electronic Packaging Technology (ICEPT)

作者： Liu, Xiaofeng Miao, Hua Wang, Guodong Yao, Tengfei Liu, Jianhui Sun, rong Shennan Circuits Co Ltd R&D Dept Shenzhen Peoples R China Sky Chip Interconnect Technol Co Ltd R&D Dept Shenzhen Peoples R China Chinese Acad Sci Shenzhen Inst Adv Technol Shenzhen Peoples R China

ISBN: (纸本)9798350338812;9798350338829

Efficient (low-loss) and robust technologies for optical in- and out-coupling from integrated waveguides at different interconnection levels is a prerequisite. A suitable beam delivery scheme is required in out-of-plane coupling configurations to reduce the losses originated from the beam divergence along the free space optical path. In this work, to realize a high coupling efficiency of inter-chip connection for three-dimensional (3-d) optical interconnects, mechanical dicing process was conducted to fabricate out-of-plane mirrors for light beam turning. A 45-degree optical interface for light 90-degree beam turning into/out of the waveguide with up-turned mirrors were demonstrated. Characterizations of the surface topographies and sloping angles revealed that relatively smooth 45-degree interface was achieved. Surprisingly, the angle deviation of the 45-degree reflector was within +/- 1 -degree, and the surface roughness was approach to 170 nm. A theoretical model specified for the optical link was developed to theoretically calculate the link loss of the 3-d optical interconnects based on the waveguide with 45-degree mirrors. The coupling loss of the 45-degree interface at the Tx and rx side was experimentally investigated. The results showed that the total link loss was 7.77 dB for a 110-mm-long waveguides and the excess loss calculated for the mirror coupling was 2.56 dB for the Tx side and 2.86 dB for the rx side. Besides, the Fresnel reflection originated from the horizontally fiber and the 90-degree end face was 0.7 dB. Misalignment tolerance results indicated that the fabricated 45-degree end face beam turning structure has relatively loose alignment requirements for the optics in the X-direction. The measured of 1 dB lateral alignment tolerance amounted to +/- 17 mu m in the X-direction. The functional optical performance indicated that the up-turned mirrors were suitable for practical printed circuit boards (OPCB) applications where an optical I/O-interfa

关键词： integrated polymer waveguide electro-optical integration 45-degree mirrors out-of-plane coupling link loss

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A PdMS/chitosan/MPMs composite film based on multi-field coupling enhancement for African swine fever virus P72 protein detection

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MICrOCHIMICA ACTA 2025年第2期192卷 1-11页

作者： Guo, Xing Liu, Yuanhang Zhao, dong duan, Qianqian Sang, Shengbo Taiyuan Univ Technol Coll Integrated Circuits Shanxi Key Lab Micro Nano Sensors & Artificial Int Taiyuan 030024 Peoples R China Taiyuan Univ Technol Key Lab Adv Transducers & Intelligent Control Syst Minist Educ Taiyuan 030024 Peoples R China Shanxi Res Inst 6D Artificial Intelligence Biomed Taiyuan 030024 Peoples R China

African swine fever (ASF) is an acute hemorrhagic disease in pigs caused by the African swine fever virus (ASFV), which has a high mortality rate and brought great damage to global pig farming industry. At present, there is no effective treatment or vaccine to combat ASFV infection, so early detection of ASFV has become particularly important. Therefore, the PdMS/chitosan/MPMs composite film was proposed to detect ASFV P72. PdMS mixed with chitosan particles were used to provide biological modification sites for the ASFV P72 antibody, which simplified the functional modification process. The specific binding of antigen and antibody leads to the mechanical deformation of the composite film, which was observed through optical method to change the microsphere spacing. The polystyrene microsphere (PMs) spacing changes were acquired by simply measuring the diameters of the debye ring diffracted by the PdMS/chitosan/PMs with a simple laser pointer. The conductive layer formed by AgNWs realize the transformation of biological signals to electrical signals. By conjugating PMs with Fe3O4 nanoparticles (MPMs) and applying a magnetic field, a magnetic-stress-electric coupling system has been constructed, which amplifies the deformation of the composite film and enhances the sensitivity of the flexible film. The experimental results showed that the flexible film has wide linear range of 10 ng/mL-100 mu g/mL, and the optimal detection limit (LOd) is 0.059 ng/mL, which was about one order of magnitude lower than that without magnetic field. In addition, the flexible film showed a good stability, specificity, and selectivity.

关键词： Magnetic-stress-electric coupling Microsphere Flexible thin films ASFV P72 detection debye ring diffraction

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BitCluster: Fine-Grained Weight Quantization for Load-Balanced Bit-Serial Neural Network Accelerators

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IEEE TrANSACTIONS ON COMPUTEr-AIdEd dESIGN OF INTEGrATEd circuits ANd SYSTEMS 2022年第11期41卷 4747-4757页

作者： Li, Ang Mo, Huiyu Zhu, Wenping Li, Qiang Yin, Shouyi Wei, Shaojun Liu, Leibo Tsinghua Univ Beijing Natl Res Ctr Informat Sci & Technol Sch Integrated Circuits Beijing 10084 Peoples R China Intel Corp Mobileye R&D China Beijing 100080 Peoples R China

Convolutional neural network (CNN) has demonstrated great success in pattern recognition scenarios at the cost of nearly billions of parameters and consequent convolution operations. Various dedicated hardware designs are proposed to accelerate the CNN computation in more energy-efficient manners. Especially, the bit-serial accelerator (BSA) is one of the most effective approaches on resource-limited platforms by eliminating zero-bit computations. However, the irregular distribution and varying number of effectual (nonzero) bits in weights significantly cause hardware underutilization, impeding further performance improvement of state-of-the-art BSAs. To address this issue, BitCluster, a hardware-friendly quantization method, is proposed to make each weight with the identical number of effectual bits for load-balanced computation. Considering distinct sensitivities to weight precision in different neural layers, layer-level BitCluster is proposed to design further for fine-grained weight quantization. It systematically determines the layerwise quantization configurations, which significantly improve the overall performance with <1% accuracy loss. BitCluster is comprehensively evaluated on a BitCluster-compatible BSA design by taking six mainstream CNN models as benchmarks. The experimental results show that the BitCluster-based BSA achieves 1.6x higher hardware utilization and 3.4x speedup on average than state-of-the-art BSAs, with 5x better energy efficiency on average.

关键词： Bit-serial accelerator (BSA) fine-grained quantization hardware/software co-design neural network

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4 inch Gallium Oxide Field-Effect Transistors Array with High-k Ta2O5 as Gate dielectric by Physical Vapor deposition

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PHYSICA STATUS SOLIdI-rAPId rESEArCH LETTErS 2024年第8期18卷 2400046-2400046页

作者： Liu, Zi Chun Li, Jia Cheng Yang, Hui Xia Yang, Han Huang, An dai, de Huang, Yuan Zhang, Yi Yun Lai, Pui To Ma, Yuan Xiao Wang, Ye Liang Beijing Inst Technol Sch Integrated Circuits & Elect Beijing 100081 Peoples R China Beijing Inst Technol Yangtze Delta Reg Acad Beijing 100081 Peoples R China Chinese Acad Sci Inst Semicond R&D Ctr Solid State Lighting Beijing 100083 Peoples R China Univ Hong Kong Dept Elect & Elect Engn Pokfulam Rd Hong Kong 999077 Peoples R China

Field-effect transistors (FETs) with ultra-wide bandgap semiconductor Ga2O3 have been fabricated by physical vapor deposition with advantages of low cost, wafer scale, and rapid production. The insulator-like pristine Ga2O3 is converted to semiconductor by co-sputtering Sn with post-annealing, which demonstrates a 5.6 x 10(7) times higher on-state current. Importantly, this Sn-doped Ga2O3 sample shows a high breakdown voltage near 500 V. Furthermore, a 4 inch array of Sn-doped Ga2O3 FETs with high-k Ta2O5 gate dielectric has been fabricated on a silicon substrate, successfully showing a large on-current density of 1.3 mA mm(-1), a high I-ON/I-OFF of 2.5 x 10(6), and a low threshold voltage of 3.9 V, which are extracted from the average 350 devices. This work paves a promising way for Ga2O3-based nanoelectronics to serve medium-high voltage with low cost, rapid, and wafer-scale production.

关键词： 4-inch wafer scale e-mode Sn-doped Ga2O3 FETs high-k gate dielectric high-voltage nanodevices rT-physical vapor deposition

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Low-voltage organic field-effect transistors by using solution-processable high-κ inorganic-polymer hybrid dielectrics

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PHYSICA SCrIPTA 2024年第10期99卷 105988-105988页

作者： rong, Bin Zhao, Wei Liao, Yi Zhang, Yixiao Zhu, Yangyang Shi, Wei Wei, Bin Shanghai Univ Sch Mechatron Engn & Automat Shanghai 200444 Peoples R China Shanghai Univ Key Lab Adv Display & Syst Applicat Minist Educ Shanghai 200072 Peoples R China Shanghai Univ Microelect R&D Ctr Sch Mechatron Engn & Automat Shanghai 200072 Peoples R China Shanghai Univ Shanghai Engn Res Ctr Integrated Circuits & Adv Di Shanghai 200072 Peoples R China

Organic field-effect transistors (OFETs) incorporating hybrid high-kappa inorganic Al2O3 and polymer dielectrics, including polyvinyl alcohol (PVA), polystyrene (PS), or polymethyl methacrylate (PMMA), through solution-processing techniques were fabricated. The analyses revealed that the high surface energy and hydrophilicity property of Al2O3 and PVA, and the relatively hydrophobic property of PS surface, hindered the performance of corresponding OFETs. The Al2O3/PMMA-based OFET achieved the optimized performance, with a threshold voltage of -2.7 V, a hole carrier mobility of 0.056 cm(2)/Vs, and a current on/off ratio of 1.0 x 10(4) at a low operating voltage of -5 V. Through analyzing the characteristics of leakage current, capacitance, contact resistance, and trap density of OFETs, we found that the PMMA-engaged films possessed the optimized electrical properties. The introduction of PMMA eliminated the interfacial trapping, thereby lowering the threshold voltage and enhancing the performance of the device. The COMSOL Multiphysics simulation was conducted to confirm the physical mechanism. The strategy of utilizing Al2O3/PMMA hybrid dielectric could simultaneously ensure the low operating voltage and good performance of OFET, while guaranteeing the low leakage current by the thick PMMA.

关键词： organic field-effect transistors hybrid dielectrics low voltage high-kappa inorganic dielectric polymer dielectric

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Magnetic anisotropic membrane-based mechanical biosensor for sensitization enhancement

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SENSOrS ANd ACTUATOrS B-CHEMICAL 2025年 422卷

作者： Bai, Jinsuo Yao, Penglong Wang, Haoyu Wu, Sitong Guo, Xing Sang, Shengbo Zhou, Chuangang Zhao, dong dong, Xiushan Taiyuan Univ Technol Coll Integrated Circuits Shanxi Key Lab Micro Nano Sensors & Artificial Int Taiyuan 030024 Peoples R China Taiyuan Univ Technol Key Lab Adv Transducers & Intelligent Control Syst Minist Educ Taiyuan 030024 Peoples R China Shanxi Res Inst 6D Artificial Intelligence Biomed Taiyuan 030024 Peoples R China Shanxi Bethune Hosp Taiyuan 030024 Peoples R China

Mechanical biosensors based on surface stress present a novel paradigm for the detection of biological molecules. However, the sensitivity improvement of the mechanical biosensor remains a significant challenge. Herein, a magnetic-sensitization mechanical biosensor based on stress-electric conversion was proposed to enhance the hemoglobin (HB) detection performance. To achieve this, the magnetic anisotropic PdMS membrane with the Fe3O4 nanoparticles chain-like structures was employed as the sensitive element of the biosensors. Benefiting from the super-paramagnetic property and magnetization retention of the membrane, the biosensor obtained a pre-strain in a magnetic field to overcome membrane gravity. The biosensor received signal amplification, resulting in greater membrane deformation due to the surface stress. The HB detection associated with hematological disease serve as a proof of concept indicating the enhanced sensitivity. The limit of detection (LOd) for HB was calculated as 42.91 ng/mL, which was lower by 1 order of magnitude than that at the isotropic biosensor. The successful and accurate testing of clinical blood samples also revealed the reliability of the biosensor. The detection results of HB demonstrated the key role of anisotropic magnetic thin films to the sensitivity improvement of mechanical biosensors, and provided a new strategy for early diagnosis of blood diseases.

关键词： Mechanical biosensor HB detection Magnetic anisotropic membrane Sensitization enhancement

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