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A Planar Near-field Measurement System for Microwave Power Transmission

A Planar Near-field Measurement System for Microwave Power T...

IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)

作者： Jingxian Yang Longying Guo Meng Yang China Ship Development and Design Center Science and Technology on Electromagnetic Compatibility Laboratory Wuhan China

ISBN: (数字)9781728160641

ISBN: (纸本)9781728160658

This paper has developed a planar near-field measurement system that can be used for microwave power transmission. This system is composed of T/R module, two-dimensional scanner, microwave probe and computer. It has the characteristics of high precision and real-time processing of data, and can be used for planar near-field field measurement. In order to verify its function, we used a microstrip array antenna working at 5.8GHz as the antenna under test (AUT). The experimental results are consistent with the simulated results.

关键词： Antenna measurements Microwave measurement Microwave antenna arrays Microwave technology Transmission line measurements Magnetic field measurement Microstrip antenna arrays

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Tunable Force Sensor Based on Carbon Nanotube Fiber for Fine Mechanical and Acoustic Technologies

SSRN

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SSRN 2022年

作者： Zhilyaeva, Maria A. Asiyanbola, Oyedamola A. Lomakin, Maksim V. Mironov, Dima M. Voloskov, Boris S. Mikladal, Bjørn Tsetsereukou, Dzmitry O. Fedorov, Fedor S. Shandakov, Sergey D. Nasibulin, Albert G. Laboratory of Nanomaterials Center for Photonics and Quantum Materials Skolkovo Institute of Science and Technology Nobel St. 3 Moscow121205 Russia Institute of Fundamental Sciences Kemerovo State University Krasnaya str. 6 Kemerovo650000 Russia Robotics Research Center Skolkovo Institute of Science and Technology Nobel St. 3 Moscow121205 Russia Center for Design Manufacturing and Materials Skolkovo Institute of Science and Technology Bolshoy Boulevard 30 bld. 1 Moscow121205 Russia Canatu ltd Tiilenlyöjänkuja 9 A VantaaFI-01720 Finland Department of Chemistry and Materials Science Aalto University FI-00076 Aalto Espoo16100 Finland

design of new smart prosthetics or robotic grippers gives a major impetus to low-cost manufacturing and rapid prototyping of force-sensing devices. In this paper, we examine piezoresistive force sensors based on carbon nanotube fibers fabricated by a novel wet pulling technique. The developed sensor is characterized by an adjustable force range coupled with high sensitivity to enable the detection of a wide range of forces and displacements limited by the experimental setup only. We have demonstrated the applicability of the developed unit in tactile sensing, displacement sensing, and nanophone vibration monitoring system and evaluated its force sensing characteristics, i.e. displacement/force input and resistance/mechanical response. In the experiments it measures 0-115 N force range within 2.5 mm displacement. Moreover, the sensor demonstrates good linearity, low hysteresis, and stability when tested over 10 000 cycles. The developed sensor suits multiple applications in the field of soft and transparent sensors, nanophones, actuators, and other robotics devices for both regular and extreme environments, e.g. deep underwater and radioactive environment. © 2022, The Authors. All rights reserved.

关键词： Single-walled carbon nanotubes (SWCN)

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Hybrid Palladium Catalyst Assembled from Chiral Phosphoric Acid and Thioamide for Enantioselective β-C(sp3)−H Arylation

引用

Angewandte Chemie 2020年第31期132卷 12874-12878页

作者： Jiang H.-J. Zhong X.-M. Liu Z.-Y. Geng R.-L. Li Y.-Y. Wu Y.-D. Zhang X. Gong L.-Z. Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry University of Science and Technology of China Hefei 230026 China Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen 518055 China Shenzhen Bay Laboratory Shenzhen 518055 China

A hybrid palladium catalyst assembled from a chiral phosphoric acid (CPA) and thioamide enables a highly efficient and enantioselective β-C(sp3)−H functionalization of thioamides (up to 99 % yield, 97 % ee). A kinetic resolution of unsymmetrical thioamides by intermolecular C(sp3)−H arylation can be achieved with high s-factors. Mechanistic investigations have revealed that stereocontrol is achieved by embedding the substrate in a robust chiral cavity defined by the bulky CPA and a neutral thioamide ligand. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： C−H activation kinetic resolution ligand effects palladium synthetic methods

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Cover Feature: Theory-Guided Machine Learning to Predict the Performance of Noble Metal Catalysts in the Water-Gas Shift Reaction (ChemCatChem 16/2022)

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ChemCatChem 2022年第16期14卷

作者： Dr. Joyjit Chattoraj Dr. Brahim Hamadicharef Dr. Jian Feng Kong Mohan Kashyap Pargi Yingzhi Zeng Dr. Chee Kok Poh Dr. Luwei Chen Dr. Fei Gao Dr. Teck Leong Tan Computing and Intelligence Institute of High Performance Computing Agency for Science Technology and Research Singapore Materials Science and Chemistry Institute of High Performance Computing Agency for Science Technology and Research Singapore Catalysis and Reactor Design Institute of Sustainability for Chemical Energy and Environment Agency for Science Technology and Research Singapore

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Bio-inspired Double Angstrom-Scale Confinement in Ti-deficient Ti0.87O2Nanosheet Membranes for Ultrahigh-performance Osmotic Power Generation

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Angewandte Chemie 2023年第4期136卷

作者： Chao Liu Prof. Dr. Caichao Ye Tianning Zhang Jiheng Tang Kunpeng Mao Dr. Long Chen Dr. Liang Xue Prof. Dr. Jingwen Sun Prof. Dr. Wenqing Zhang Prof. Dr. Xin Wang Prof. Dr. Pan Xiong Prof. Dr. Guoxiu Wang Prof. Dr. Junwu Zhu Key Laboratory for Soft Chemistry and Functional Materials of Ministry Education School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China Academy for Advanced Interdisciplinary Studies & Department of Materials Science and Engineering Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Shenzhen 518055 China Centre for Clean Energy Technology School of Mathematical and Physical Sciences Faculty of Science University of Technology Sydney Sydney NSW 2007 Australia

Osmotic power, a clean energy source, can be harvested from the salinity difference between seawater and river water. However, the output power densities are hampered by the trade-off between ion selectivity and ion permeability. Here we propose an effective strategy of double angstrom-scale confinement (DAC) to design ion-permselective channels with enhanced ion selectivity and permeability simultaneously. The fabricated DAC-Ti 0.87 O 2 membranes possess both Ti atomic vacancies and an interlayer free spacing of ≈2.2 Å, which not only generates a profitable confinement effect for Na + ions to enable high ion selectivity but also induces a strong interaction with Na + ions to benefit high ion permeability. Consequently, when applied to osmotic power generation, the DAC-Ti 0.87 O 2 membranes achieved an ultrahigh power density of 17.8 W m −2 by mixing 0.5/0.01 M NaCl solution and up to 114.2 W m −2 with a 500-fold salinity gradient, far exceeding all the reported macroscopic-scale membranes. This work highlights the potential of the construction of DAC ion-permselective channels for two-dimensional materials in high-performance nanofluidic energy systems.

关键词： 2D Membranes Double Angstrom-Scale Confinement Enhanced Permselectivity Ion Transport Osmotic Energy

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Beyond biochemical patterning: How mechanical bistability governs robust organoid morphogenesis

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Mechanobiology in medicine 2025年第2期3卷 100134页

作者： Qigan Gao Yuehua Yang Haoxiang Yang Hongyuan Jiang CAS Key Laboratory of Mechanical Behavior and Design of Materials CAS Center for Excellence in Complex System Mechanics Department of Modern Mechanics University of Science and Technology of China Hefei Anhui 230026 China.

Understanding the regulatory mechanisms of intestinal organoid morphogenesis remains a fundamental challenge in organoid biology. Emerging evidence highlights mechanical bistability as a critical regulator, mediated by dynamic lumen-actomyosin feedback. The recently developed 3D vertex model demonstrates that crypt curvature modulates actomyosin localization via mechanosensitive pathways, creating two stable morphological states-bulged or budded-depending on mechanical history. This model advances beyond static vertex models by incorporating epithelial thickness variations and lumen pressure effects, explaining previously unresolved phenomena like irreversible crypt budding and snap-through transitions. The findings establish a new framework for understanding mechanical decision-making in epithelial tissues, with implications for organoid engineering and developmental biology.

关键词： Epithelial mechanics Intestinal organoids Mechanical bistability Morphogenesis Vertex model

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Analysis of therapeutic targets for SARS-CoV-2 and discovery of potential drugs by computational methods

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Acta Pharmaceutica Sinica B 2020年第5期10卷 766-788页

作者： Canrong Wu Yang Liu Yueying Yang Peng Zhang Wu Zhong Yali Wang Qiqi Wang Yang Xu Mingxue Li Xingzhou Li Mengzhu Zheng Lixia Chen Hua Li Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation School of PharmacyTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Wuya College of Innovation Key Laboratory of Structure-Based Drug Design&DiscoveryMinistry of EducationShenyang Pharmaceutical UniversityShenyang 110016China National Engineering Research Center for the Emergency Drug Beijing Institute of Pharmacology and ToxicologyBeijing 100850China

SARS-CoV-2 has caused tens of thousands of infections and more than one thousand *** are currently no registered therapies for treating coronavirus *** of time consuming process of new drug development,drug repositioning may be the only solution to the epidemic of sudden infectious *** systematically analyzed all the proteins encoded by SARS-CoV-2 genes,compared them with proteins from other coronavirnses,predicted their structures,and built 19 structures that could be done by homology *** performing target-based virtual ligand screening,a total of21 targets(including two human targets)were screened against compound libraries including ZINC drug database and our own database of natural *** and screening results of important targets such as 3-chymotrypsin-like protease(3 CLpro),Spike,RNA-dependent RNA polymerase(RdRp),and papain like protease(PLpro)were discussed in *** addition,a database of 78 commonly used antiviral drugs including those currently on the market and undergoing clinical trials for SARS-CoV-2 was *** targets of these compounds and potential drugs acting on a certain target were *** study will provide new lead compounds and targets for further in vitro and in vivo studies of SARS-CoV-2,new insights for those drugs currently ongoing clinical studies,and also possible new strategies for drug repositioning to treat SARS-CoV-2 infections.

关键词： SARS-CoV-2 Drug repurposing Molecular docking Remdesivir Homology modeling

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Surface sieving carbon skins for propylene and propane separation

Nature Chemical Engineering

引用

Nature Chemical Engineering 2024年 411-420页

作者： Li-Ping Guo Ru-Shuai Liu Guang-Ping Hao An-Hui Lu Jianhao Qian Hengan Wu Fengchao Wang Junjie Guo State Key Laboratory of Fine Chemicals Frontier Science Center for Smart Materials Liaoning Key Laboratory for Catalytic Conversion of Carbon Resources and School of Chemical Engineering Dalian University of Technology Dalian P. R. China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei P. R. China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education Taiyuan University of Technology Taiyuan P. R. China

The adsorptive separation of olefin/paraffin mixtures requires the development of robust adsorbents with high selectivity and adsorption capacity. Here we introduce surface sieving carbon adsorbents for propylene/propane separations. The surface sieving carbon skins, with a thickness of approximately 5.0 nm, selectively sieve propylene through narrow slits centered at 3.6 Å. Underneath the carbon skin lies a pore reservoir centered at 4.9 Å, resulting in a high propylene adsorption capacity of ~2.0 mmol g−1. Such carbon structures readily self-assemble into water-stable and robust monoliths with highly interconnected macropores for efficient mass transfer. These structural advantages collectively contribute to the high propylene/propane separation performance of the surface sieving carbon even after boiling in water for a week. Process simulations reveal that, using this adsorbent class, 99.5% and 99.9% purity of propylene with the according recovery of 82% and 79% can be obtained from an equimolar propylene/propane mixture through a two-bed six-step vacuum swing adsorption process.

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Two-dimensional non-van der Waals niobium nitride nanosheets with high-temperature two-gap superconductivity

arXiv

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arXiv 2025年

作者： Xiong, Si-Yi Jiang, Peng Wang, Yiming Li, Yan-Ling Laboratory for Quantum Design of Functional Materials School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou221116 China Center for High Pressure Science and Technology Advanced Research Shanghai201203 China

The exploration of the superconductivity in two-dimensional materials has garnered significant attention due to their promising low-power applications and fundamental scientific interest. Here, we report some novel stable non-van der Waals NbxNx+1 (x = 1-4) monolayers derived from the NbN bulk exfoliated along the [001] direction, as identified through first-principles calculations. Among these monolayers, Nb2N3, which crystallizes in the P6m2 symmetry, stands out with an exceptional superconducting transition temperature of 77.8 K, setting a new high-Tc benchmark for two-dimensional transition metal nitrides and binary compounds. Our detailed analysis reveals that the strong superconductivity in Nb2N3 is driven by phonon modes dominated by N vibrations, with significant electron-phonon coupling contributions from N-p and Nb-d electronic states. Using the anisotropic Migdal-Eliashberg framework, we further determine the two-gap nature of the superconductivity in the Nb2N3 monolayer, characterized by pronounced electron-phonon coupling and anisotropic energy gaps. These results advance our understanding of superconductivity in two-dimensional transition metal nitride and highlight their potential for nanoscale superconducting applications. Copyright © 2025, The Authors. All rights reserved.

关键词： Nickel compounds

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The Loss of Urban Resilience is Consistent with the Decline of Sustainability

SSRN

引用

SSRN 2022年

作者： Hu, Tian Wu, Jiansheng School of Urban Economics and Public Administration Capital University of Economics and Business Beijing100070 China Key Laboratory for Urban Habitat Environmental Science and Technology School of Urban Planning and Design Peking University Shenzhen518055 China Key Laboratory for Earth Surface Processes Ministry of Education College of Urban and Environmental Sciences Peking University Beijing100871 China

Sustainability and resilience are ambiguously used in theory and practices, and have not so far connected with each other clearly. This study attempts to clarify whether the transformation of specified resilience is consistent with urban sustainability. Here, urban sustainability is operationalized with the variations of multifaceted biophysical properties at temporal scale, and urban resilience is characterized by different levels of waterlogging. Results show that the waterlogging resilience appears strong spatial aggregation both at watershed scale and from waterlogging points perspectives. Meanwhile, the examined urban system is dominated by a series of negative feedbacks including the deterioration of soil retention, unstable ecological security, climate warming, and intensified precipitation. When the sustainability is aligned with waterlogging resilience, we find most indicators decrease rapidly as approaching to waterlogging points and remain stable when the distance is beyond 1.6 km. It is suggested that the surroundings where the distance from waterlogging points is within 1.6 km should be tailored for urban adaptive management. Our findings provide novel empirical insights for better understanding the relationship of sustainability and resilience by showing that the declining of urban properties is spatially coincident with the transformation of resilience and further presents threshold effect. © 2022, The Authors. All rights reserved.

关键词： Sustainable development

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