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Comparison of the low noise performance of GaN HEMTs and MIS-HEMTs at cryogenic temperatures

Comparison of the low noise performance of GaN HEMTs and MIS...

European (Formerly European Gallium Arsenide and Other Semiconductors Application Symposium - EGASS) Microwave Integrated Circuit Conference (EuMIC)

作者： Mohamed Aniss Mebarki Ragnar Ferrand-Drake Del Castillo Erik Sundin Denis Meledin Mattias Thorsell Niklas Rorsman Victor Belitsky Vincent Desmaris Department of Space Earth and Environment Group for Advanced Receiver Development (GARD) Chalmers University of Technology Sweden Department of Microtechnology and Nanoscience Microwave Electronics Lab (MEL) Chalmers University of Technology Sweden

This work presents the comparison of the noise performance of AlGaN/GaN MIS-HEMTs and HEMTs at cryogenic temperatures. Wideband noise measurements at a physical temperature of ~4K were performed in order to extract the noise characteristics of the devices, within the range of frequencies of 3–7 GHz. A DC and RF characterization of the devices are also presented to further assess their cryogenic performances. Over the measured frequency band, the results indicate that both technologies are able to present an average best noise temperature as low as 8 K. The MIS-HEMT presents a slight advantage at low bias condition, mainly due to its reduced gate capacitance. The presented results are the first report on the microwave low-noise performance of cryogenic GaN MIS-HEMT, and constitute their current state-of the art.

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Integrated microdevice with a windmill-like hole array for the clog-free,efficient,and self-mixing enrichment of circulating tumor cells

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Microsystems & Nanoengineering 2022年第1期8卷 291-304页

作者： Hao Li Jinze Li Zhiqi Zhang Zhen Guo Changsong Zhang Zixu Wang Qiuquan Guo Chao Li Chuanyu Li Jia Yao Anran Zheng Jingyi Xu Qingxue Gao Wei Zhang Lianqun Zhou School of Biomedical Engineering(Suzhou) Division of Life Sciences and MedicineUniversity of Science and Technology of China260026 HefeiChina CAS Key Lab of Bio-Medical Diagnostics Suzhou Institute of Biomedical Engineering and TechnologyChinese Academy of Sciences215163 SuzhouChina Ji Hua Laboratory 528000 FoshanChina Department of Laboratory Medicine The Affiliated Suzhou Science and Technology Town HospitalNanjing Medical University215153 SuzhouChina Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China518000 ShenzhenChina Suzhou CASENS Co. Ltd215163 SuzhouChina Jinan Guoke Medical Technology Development Co. Ltd250001 JinanChina

Circulating tumor cells(CTCs)have tremendous potential to indicate disease progression and monitor therapeutic response using minimally invasive *** the limitations of affinity strategies based on their cost,effectiveness,and simplicity,size-based enrichment methods that involve low-cost,label-free,and relatively simple protocols have been further ***,the key challenges of these methods are clogging issues and cell aggregation,which reduce the recovery rates and *** by the natural phenomenon that the airflow around a windmill is disturbed,in this study,a windmill-like hole array on the SU-8 membrane was designed to perturb the fluid such that cells in a fluid would be able to self-mix and that the pressure acting on cells or the membrane would be dispersed to allow a greater *** addition,based on the advantages of fluid coatings,a lipid coating was used to modify the membrane surface to prevent cell aggregation and clogging of the *** the optimal conditions,recovery rates of 93%and 90%were found for A549 and HeLa cells in a clinical simulation test of our platform with a CTC concentration of 20-100 cells per milliliter of *** white blood cell(WBC)depletion rate was 98.7%(n=15),and the CTC detection limit was less than 10 cells per milliliter of blood(n=6).Moreover,compared with conventional membrane filtration,the advantages of the proposed device for the rapid(2 mL/min)and efficient enrichment of CTCs without clogging were shown both experimentally and *** to its advantages in the efficient,rapid,uniform,and clog-free enrichment of CTCs,our platform offers great potential for metastatic detection and therapy analyses.

关键词： logging free aggregation

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Design and Damping Characterization of Sandwich Composite Made of Particle-Filled Hollow Spheres and Steel Sheets

SSRN

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SSRN 2024年

作者： Zhou, Xin Penter, Lars Jehring, Ulrike Göhler, Hartmut Weißgärber, Thomas Ihlenfeldt, Steffen Chair of Machine Tools Development and Adaptive Control Institute of Mechatronic Engineering Technische Universität Dresden Germany Fraunhofer Institute for Machine Tools and Forming Technology IWU Germany Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM Branch Lab Dresden Germany

Sandwich composites of particle-filled hollow sphere structures (PHSS) and steel plates offer outstanding lightweight and damping properties, making them ideal for high-speed machine tool components under dynamic loads. Previous research has focused on single particle-filled hollow sphere (PHS) and small-sized PHSS, leaving gap in understanding of the behavior of PHSS/steel sandwich composites. As a result, this material cannot yet be used in the design of machine tools. In this study, a test rig was developed, a design of experiments approach and response surface analysis were used to investigate the effect of design parameters (shell and core thickness), and particle parameters (filling ratio and particle size) on the damping performance of PHSS/steel sandwich. The experimental results indicate that the design parameters have a more significant influence on damping, so they should be given priority in the design of PHSS/steel sandwiches. Secondly, the correlation between design and particle parameters substantially affects the damping performance of the sandwich. Minimizing particle size, increasing filling ratio, thinning the face layer, and thickening the core layer significantly increase structural *** address the manufacturing tolerances of the cellular structure, this study develops a finite element (FE) model-based optimization approach that accurately determines the material parameters of PHSS. These parameters were used in a FE-model of PHSS/steel composite using identified contact parameters by minimizing the difference of measurement and simulation. It shows that the homogenized material model and linear model using global damping parameters accurately replicates the dynamic properties of PHSS/steel sandwich composite in low vibration modes. © 2024, The Authors. All rights reserved.

关键词： Damping

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Boosting oxygen evolution of LiCoO2 electrocatalysts via lithium defect

Materials Today Catalysis

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Materials Today Catalysis 2025年 8卷

作者： Li, Huamei Li, Mengyuan Liao, Lingling Yang, Han Xiang, Kun Luo, Guoqiang Xie, Mingjiang School of Chemistry and Environmental Engineering Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Wuhan Institute of Technology Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Key Lab for Processing and Application of Catalytic Materials College of Chemical Engineering Huanggang Normal University Huanggang438000 China

The challenge of the complex oxygen evolution reaction (OER) currently impedes the efficient production of hydrogen via electrolytic water splitting. To address this issue, the development and improvement of effective electrocatalysts are required. LiCoO2, a key material in lithium-ion batteries, has shown promising potential as an electrocatalyst for electrochemical energy conversion. However, OER catalysts derived from LiCoO2 have faced obstacles such as high overpotential and a complicated preparation process. In this study, the preparation method is adjusted to optimize the synthesis of Li1-xCoO2 with a defective structure, resulting in an impressive overpotential of only 290 mV at a current density of 100 mA cm−2 and a remarkable Tafel slope of 15.2 mV dec−1. The exceptional catalytic activity of Li1-xCoO2 can be attributed to the absence of Li, which triggers oxidative alterations in the electronic structure of Co. Density functional theory (DFT) calculations reveal that Li defects can influence the d-band center of active Co sites, enhancing the adsorption capabilities of Co sites towards *OOH intermediates and increasing the conductivity of the electrocatalyst during the OER process. These alterations improve the velocity of the crucial step in the reaction, ultimately boosting the catalyst's overall performance and efficiency. © 2024 The Authors

关键词： Lithium-ion batteries

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Elucidation of the sodiation/desodiation mechanism in Ca_(0.5)Ti_(2)(PO_(4))_(3)/C as promising electrode for sodium batteries: New insights into the phase transitions

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Journal of Energy Chemistry 2022年第7期31卷 36-44,I0002页

作者： Abdelhaq Nassiri Noha Sabi Angelina Sarapulova Yingjin Wei Bouchaib Manoun Sylvio Indris Alexandr Missyul Helmut Ehrenberg Ismael Saadoune IMED-Lab Faculty of Science and Technology-Cadi Ayyad University(UCA)Av.A.El KhattabiP.B.549MarrakeshMorocco Institute for Applied Materials(IAM) Karlsruhe Institute of Technology(KIT)P.O.Box 364076021 KarlsruheGermany Key Laboratory of Physics and Technology for Advanced Batteries(Ministry of Education) Jilin Engineering Laboratory of New Energy Materials and TechnologyCollege of PhysicsJilin UniversityChangchun 130012JilinChina MSN Mohamed VI Polytechnic UniversityLot 660Hay Moulay RachidBen Guerir 43150Morocco CELLS-ALBA Synchrotron E-08290 Cerdanyola del VallesBarcelonaSpain Technology Development Cell(Techcell) Technology Transfer Office(TTO)Mohamed VI Polytechnic UniversityLot 660Hay Moulay RachidBen Guerir 43150Morocco

The structure evolution and electrochemical performance of Na SICON-type Ca_(0.5)Ti_(2)(PO_(4))_(3) for sodium batteries are *** phosphate was synthesized by a solid-state method,and the obtained particles were coated with carbon using *** compound crystallizes in the rhombohedral system with space group *** presence of carbon in the Ca_(0.5)Ti_(2)(PO_(4))_(3)/C composite was confirmed by Raman and Thermogravimetric *** electrochemical performance of Ca_(0.5)Ti_(2)(PO_(4))_(3)/C was investigated in the potential window 1.5–3.0 V *** metal at different scan *** compound is able to initially intercalate/deintercalate 1.6/1.15 Na per formula unit,*** operando synchrotron diffraction was done in the potential window 0.02–3.0 V ***|Na+and revealed the occurrence of several reaction regions upon first *** to 4 Na+ion per formula unit can be inserted during the first *** intensive refinement of the synchrotron X-ray diffraction(SXRD)patterns of discharged Ca_(0.5)Ti_(2)(PO_(4))_(3) evidenced the existence of five regions depending on the sodium content while the crystal structures of new phases were elucidated for the first time where sodium insertion occurs in the unusual M3 and M’3 sites of the Na SICON structure.

关键词： Sodium-ion batteries Phosphates Synchrotron Mechanism Energy storage

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Single-cell characterization of major components of plant cell walls in situ by Raman spectroscopy

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Science China(Life Sciences) 2024年第8期67卷 1772-1774页

作者： Yujian Li Weiwei Shen Xi Zhang Yaning Cui Yuanyuan Zhao Yayu Guo Xiaojuan Li Shuizhong Wang Guoyong Song Pu Wang Jianfeng Ma Jinxing Lin State Key Laboratory of Efficient Production of Forest Resources College of Biological Sciences and TechnologyBeijing Forestry UniversityBeijing 100083China Institute of Tree Development and Genome Editing Beijing Forestry UniversityBeijing 100083China National Engineering Research Center of Tree Breeding and Ecological Restoration College of Biological Sciences and TechnologyBeijing Forestry UniversityBeijing 100083China Beijing Key Laboratory of Lignocellulosic Chemistry Engineering Research Center of Forestry Biomass Materials and EnergyMinistry of EducationBeijing Forestry UniversityBeijing 100083China Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical EngineeringBeihang UniversityBeijing 100191China Key lab of Bamboo and Rattan Science&Technology International Center for Bamboo and RattanBeijing 100102China

Dear Editor,Plant cell walls are complex and dynamic structures that are mainly composed of polysaccharide polymers such as cellulose,hemicellulose,and pectin,in addition to substantial amounts of the non-saccharide polymer lignin(McFarlane et al.,2014;German et al.,2023).The components of cell walls are interconnected in various ways to form a complex,multilayered network structure(Wen et al.,2023).

关键词： walls cellulose characterization

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A Multi-model Fusion of LiDAR-inertial Odometry via Localization and Mapping

A Multi-model Fusion of LiDAR-inertial Odometry via Localiza...

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IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： An Duy Nguyen Chuong Phuoc Le Pratik Walunj Anton Netchaev Thanh Nho Do Hung Manh La Department of Computer Science and Engineering Advanced Robotics and Automation (ARA) Lab University of Nevada Reno NV USA USACE Engineer Research and Development Center (ERDC) Information Technology Lab Vicksburg MS USA Graduate School of Biomedical Engineering UNSW Sydney Kensington Campus NSW Australia

ISBN: (数字)9798350377705

ISBN: (纸本)9798350377712

This work presents a comprehensive LiDAR-inertial odometry framework featuring robust smoothing and mapping capabilities, effectively correcting LiDAR feature point skewness using an inertial measurement unit (IMU). While the Extended Kalman Filter (EKF) is a common choice for nonlinear motion estimation, its complexity grows when handling maneuvering targets. To overcome this challenge, a new framework that incorporates the Iterated Interactive Multiple Models of Kalman Filter (IMMKF) is given, providing a solution for reliable navigation in dynamic motion and noisy conditions. To ensure map consistency, an ikd-tree that facilitates continuous updates and adaptive rebalance is employed, preserving the map’s integrity. To guarantee the robustness of our approach, it undergoes extensive testing across diverse scales of indoor and outdoor environments. This testing scenario simulates absolute GPS denial. In terms of estimated motion, the new algorithm demonstrates superior accuracy compared to existing approaches. The implementation is openly accessible on GitHub 4 for further exploration.

关键词： Location awareness Technological innovation Laser radar Accuracy Smoothing methods Computational modeling Feature extraction Odometry Kalman filters Testing

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Unraveling Passivation Mechanism of Imidazolium-Based Ionic Liquids on Inorganic Perovskite to Achieve Near-Record-Efficiency CsPbI_(2)Br Solar Cells

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Nano-Micro Letters 2022年第1期14卷 152-166页

作者： Jie Xu Jian Cui Shaomin Yang Yu Han Xi Guo Yuhang Che Dongfang Xu Chenyang Duan Wenjing Zhao Kunpeng Guo Wanli Ma Baomin Xu Jianxi Yao Zhike Liu Shengzhong Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy Devices/Shaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119People’s Republic of China Dalian Institute of Chemical Physics iChEMUniversity of Chinese Academy of SciencesDalian National Laboratory for Clean EnergyChinese Academy of SciencesDalian 116023People’s Republic of China Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced Materials Research Center of Advanced Materials Science and TechnologyTaiyuan University of TechnologyTaiyuan 030024People’s Republic of China Institute of Functional Nano&Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123People’s Republic of China Department of Materials Science and Engineering and Shenzhen Engineering Research and Development Center for Flexible Solar Cells Southern University of Science and TechnologyShenzhen 518055People’s Republic of China State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power UniversityBeijing 102206People’s Republic of China

The application of ionic liquids in perovskite has attracted wide-spread attention for its astounding performance improvement of perovskite solar cells(PSCs).However,the detailed mechanisms behind the improvement remain ***,a series of imidazolium-based ionic liquids(IILs)with different cations and anions is systematically investigated to elucidate the passivation mechanism of IILs on inorganic *** is found that IILs display the following advantages:(1)They form ionic bonds with Cs^(+)and Pb^(2+)cations on the surface and at the grain boundaries of perovskite films,which could effectively heal/reduce the Cs^(+)/I−vacancies and Pb-related defects;(2)They serve as a bridge between the perovskite and the hole-transport-layer for effective charge extraction and transfer;and(3)They increase the hydrophobicity of the perovskite surface to further improve the stability of the CsPbI_(2)Br *** combination of the above effects results in suppressed non-radiative recombination loss in CsPbI_(2)Br PSCs and an impressive power conversion efficiency of 17.02%.Additionally,the CsPbI_(2)Br PSCs with IILs surface modification exhibited improved ambient and light illumination *** results provide guidance for an indepth understanding of the passivation mechanism of IILs in inorganic perovskites.

关键词： Ionic liquids Inorganic perovskite Imidazolium Passivation High efficiency

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Hybrid co-based MOF nanoboxes/CNFs interlayer as microreactors for polysulfides-trapping in lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第6期30卷 469-476,I0012页

作者： Jing Li Caiming Jiao Jinghui Zhu Liubiao Zhong Tuo Kang Sehrish Aslam Jianyong Wang Sanfei Zhao Yejun Qiu Shenzhen Engineering Lab of Flexible Transparent Conductive Films School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina State Key Laboratory of Advanced Chemical Power Sources Guizhou Meiling Power Sources Co.Ltd.Zunyi 563003GuizhouChina China Ship Development and Design Center Wuhan 430064HubeiChina

Lithium-sulfur battery is desirable for the future potential electrochemical energy storage device with advantages of high theoretical energy density,low cost and environmental ***,some natural hindrances,particularly fast capacity degradation resulting from the migration of dissolved polysulfide intermediates,remain to be significant challenges prior to the practical *** this work,a composite interlayer of carbon nanofibers(CNFs)which are enriched by Co-based metal organic frameworks(ZIF-67)growth in-situ is ***,physical blocking and chemical trapping abilities are obtained synergistically from the ZIF/CNFs interlayer,which enables to restrain the dissolution of polysulfides and alleviate shuttle ***,the three-dimensional fiber networks provide an interconnected conductive framework between each ZIF microreactor to promote fast electron transfer during cycling,thus contributing to excellent rate and cycling *** a result,Li-S cells with ZIF/CNFs interlayer show a high specific capacity of 1334 mAh g^(-1) at 1 C with an excellent cycling stability over 300 ***,this scalable and affordable electrospinning fabrication method provides a promising approach for the design of MOFs-derived carbon materials for high performance Li-S batteries.

关键词： Carbon nanofibers Metal organic framework Lithium–sulfur battery Electrochemical performance

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Oxygen vacancy mediated local symmetry breaking drives intense Raman modes in BaZrO3

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Physical Review B 2025年第10期111卷 104107-104107页

作者： Ankita Agrawal Poonam Mathur Priti Roy Rajashri R. Urkude Isha Pragati Sharma Manvendra Narayan Singh Aniket Chowdhury Shovan K. Majumder UGC-DAE Consortium for Scientific Research Indore University Campus Khandwa Road Indore 452001 Madhya Pradesh India Beamline Development & Application Section Bhabha Atomic Research Center Trombay Mumbai 400085 India Hard X-Ray Application Lab Accelerator Physics and Synchrotron Utilization Division Raja Ramanna Center for Advanced Technology Indore 452013 Madhya Pradesh India Laser Biomedical Applications Division Raja Ramanna Center for Advanced Technology Indore 452013 Madhya Pradesh India Homi Bhabha National Institute Department of Atomic Energy Mumbai 400085 India

BaZrO3 is known to be one of the very few perovskites that retains its ideal centrosymmetric Pm3¯m structure down to 2 K, despite showing intense Raman modes over the entire temperature range. Arguably, the Raman signals are either due to localized octahedral tilts/phase transition or due to second-order Raman-active phonon modes. By combining ab initio atomistic thermodynamics within the framework of density functional theory and experimental observations, we show that local disorder mediated by charged oxygen vacancy lifts this inherent cubic symmetry. The vacancies become more stable at real growth conditions viz. higher temperatures and lower oxygen partial pressures and a pseudo a0a0c− tetragonal-type structure develops in the short-range vicinity. However, the average long-range structure of BaZrO3, as determined by Bragg's diffraction, remains cubic. The defect states manifest as a shallow donor level below the conduction band minima in the electronic density of states and are responsible for a secondary transition at ≈3.86 eV in the UV-vis spectra. Our O 1s x-ray photoelectron spectra and radial distribution function analysis from extended x-ray absorption fine-structure, further validate the presence of stable anion vacancies in this perovskite. Thus, the key to the mystery of the intense Raman signal in this otherwise long-range-ordered “centrosymmetric” perovskite is related to local structural disorder created by lattice oxygen vacancies.

关键词： Electronic density of states

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