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SSRN 2023年

作者： Lv, Zhihui He, Guangzhi Ge, Yanli Liu, Yongchun Yu, Yunbo He, Hong State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China University of Chinese Academy of Sciences Beijing100049 China State Key Joint Laboratory of Environmental Simulation and Pollution Control Beijing Innovation Center for Engineering Science and Advanced Technology College of Environmental Science and Engineering Peking University Beijing100871 China Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing100029 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China

Vanadia-based catalysts are widely applied in NOx reduction, while the promoting effect of WO3 and MoO3 is still under debate. Herein, we prepared V2O5/TiO2, V2O5-WO3/TiO2, and V2O5-MoO3/TiO2 catalysts and revealed that WO3 and MoO3 enhanced the activity of V2O5/TiO2, particularly under wet conditions. In situ DRIFTS, two-dimensional correlation spectroscopy (2D COS), and DFT calculations demonstrated that NH3 adsorption on Lewis acid sites of V2O5/TiO2 resulted in the formation of NH3ads-L1 (1284 cm-1, Ti sites of O=V-O-Ti) and NH3ads-L2 (1604 cm-1, V=O sites). By using 2D COS, we firstly found that the NH3ads-L1 exhibited higher reactivity towards NO to produce NH2NO* via NH2*, which was promoted by WO3. Moreover, WO3 and MoO3 doping inhibited H2O adsorption, and promoted its desorption at elevated temperature, thus protecting the V=O sites on V2O5/TiO2. Also, 2D COS analysis provides a new perspective for in-depth understanding of the active sites and intermediates in NH3-SCR reaction. © 2023, The Authors. All rights reserved.

关键词： Catalysts

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Improved thermal properties and CMAS corrosion resistance of rare-earth monosilicates by adjusting the configuration entropy with RE-doping

SSRN

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SSRN 2023年

作者： He, Yuxuan Xiao, Guozheng Wang, Chao Lu, Xuefeng Li, Liuyuan Liu, Shiying Wu, Yusheng Lin, Jun Liang Wang, Zhanjie School of Materials Science and Engineering Shenyang University of Technology Shenyang110870 China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal Lanzhou University of Technology Lanzhou730050 China Hunan Aviation Powerplant Research Institute Aero Engine Corporation of China Zhuzhou412002 China

The novel rare earth monosilicates (xRE1/x)2SiO5 (RE=Yb, Tm, Er, Y, Dy and Tb, x=2-6) were prepared in order to establish the relationship between configurational entropy and lattice distortion, and explore the effect of configurational entropy on performance. The lattice distortion of (xRE1/x)2SiO5 increased gradually with the increase of configurational entropy, but the multi-principal component solid solution tended to form a highly symmetrical crystal structure when the configurational entropy was large enough, thus inhibiting the lattice distortion. (5RE1/5)2SiO5 had a maximum lattice distortion, which leaded to a relatively low thermal conductivity and coefficient of thermal expansion, and good CMAS corrosion resistance. © 2023, The Authors. All rights reserved.

关键词： Corrosion resistance

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Augmenting photoluminescence of monolayer MoS_(2) using high order modes in a metal dimer-on-film nanocavity

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Photonics Research 2021年第4期9卷 501-506页

作者： Shiyin Cao Liping Hou Qifa Wang Chenyang Li Weixing Yu Xuetao Gan Kaihui Liu Malin Premaratne Fajun Xiao Jianlin Zhao MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information TechnologySchool of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710129China Key Laboratory of Spectral Imaging Technology of Chinese Academy of Sciences Xi’an 710119China State Key Laboratory for Mesoscopic Physics Collaborative Innovation Centre of Quantum MatterSchool of PhysicsPeking UniversityBeijing 100871China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash UniversityClaytonVIC 3800Australia

Plasmonic particle-on-film nanocavities,supporting gap modes with ultra-small volume,provide a great solution to boost light–matter interactions at the *** this work,we report on the photoluminescence(PL)enhancement of monolayer MoS_(2) using high order modes of an Au nanosphere dimer-on-film nanocavity(DoFN).The high order plasmon modes,consisting of two bonding quadrupoles in the dimer and their images in the Au film,are revealed by combining the polarization-resolved scattering spectra with the numerical *** integrating the monolayer MoS_(2) into the DoFN,these high order modes are used to enhance PL intensity through simultaneously boosting the absorption and emission processes,producing a 1350-fold enhancement *** opens an avenue to enhance the light–matter interaction with high order plasmon modes and may find applications in future optoelectronics and nanophotonics devices.

关键词： cavity high integrating

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Enhanced Clutter Suppression and GMTIm Algorithm with Modified DKP and NCS for Single-Channel Spaceborne-Maneuvering BFSAR

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IEEE Transactions on Geoscience and Remote Sensing 2025年 63卷

作者： Liu, Yuzhou Song, Xuan Li, Yachao Wang, Yitao Guo, Yanhong Ye, Pei Wang, Xuanqi Shi, Guangming Xidian University National Key Laboratory of Radar Signal Processing Xi’an710071 China Northwestern Polytechnical University School of Astronautics Xi’an710072 China DalianNaval Academy Operation Software and Simulation Institute Dalian116018 China Dalian University of Technology Institute for Advanced Intelligence Dalian116024 China Xidian University School of Physics Xi’an710071 China Xidian University School of Artificial Intelligence Xi’an710071 China Peng Cheng Laboratory Shenzhen518055 China

Single-channel spaceborne-maneuvering bistatic forward-looking synthetic aperture radar (SS-BFSAR) enables the maneuvering platform to achieve high-resolution forward-looking imaging without deploying additional antennas or transmitting the radar signal. Nevertheless, achieving the suppression of spatial variant clutter with only the single-channel configuration remains a critical challenge for the ground moving target imaging (GMTIm) mission of SS-BFSAR. This study proposes an enhanced clutter suppression and GMTIm algorithm for SS-BFSAR. First, the proposed modified deramp-keystone processing (DKP) completely decouples the echo signal in range and azimuth while avoiding the signal-to-clutter ratio (SCR) degradation caused by the azimuth spectrum aliasing. Subsequently, two pre-focusing approaches are developed with nonlinear chirp scaling (NCS), i.e., global NCS and block NCS, to achieve deep focusing of spatial variant clutter while introducing differences of Doppler frequency position (DFP) between the clutter and GMT. These approaches preserve the clutter consistency of the pre-focus results, thereby ensuring that the GMT signal exhibits high SCR following the image domain cancellation. Finally, a matched filter and the proposed monostatic-equivalent model are used to refocus the GMT and estimate its velocity. The proposed algorithm can simultaneously obtain the well-focused ground scene image and the GMTIm result without DFP drift caused by the target’s motion. Comparative experiments using simulation and real data demonstrate the effectiveness and superiority of the proposed algorithm. © 1980-2012 IEEE.

关键词： Echo suppression

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ACTIVE POWER CONTROL STRATEGY DEPENDING ON FREQUENCY FOR MMC-HVDC SYSTEM CONNECTED TO OFFSHORE WINDFARMS 22

ACTIVE POWER CONTROL STRATEGY DEPENDING ON FREQUENCY FOR MMC...

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22nd International Symposium on High Voltage Engineering, ISH 2021

作者： Li, Fangyuan Zhu, Lin Zhou, Jiapei Kou, Longze Ren, Bixing State Key Laboratory of Advanced Power Transmission Technology China Beijing Key Laboratory of DC Grid Technology & Simulation China Global Energy Interconnection Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Jiangsu Electric Power Co. Ltd China State Grid Jiangsu Electric Power Co. Ltd China

ISBN: (纸本)9781839536052

The study proposes an active power control strategy of the modular multilevel converter (MMC) for connecting large offshore windfarms. The strategy can be used to enhance the frequency stability of onshore alternating current (AC) system. It considers the working principle of windfarms, and can tightly control the output of active power of offshore network, which contributes to onshore frequency regulation by a changeable transmission of the offshore wind energy. The dynamic performance of the High Voltage Direct Current (HVDC) based on MMC system using the proposed methods has been verified by PSCAD/EMTDC simulations. In different scenarios, the HVDC system can adjust active power accurately depending on the onshore frequency which confirms the feasibility of the methods. © 2021 The Institution of Engineering and technology.

关键词： Offshore oil well production

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Analysis And Calculation Of The Short-Circuit Current Of Xiamen VSC-HVDC Project

Analysis And Calculation Of The Short-Circuit Current Of Xia...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Lin Zhu Huaiguang Gu Fangyuan Li Longze Kou Dong Liu State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Beijing China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China

ISBN: (纸本)9781665434263

For the heavy load urban power grid, the short-circuit current is closed to the breaking capacity of the AC breaker. After the voltage sourced converter high voltage direct current (VSC-HVDC) is connected, the short-circuit current of VSC-HVDC will be provided during the fault period, which will cause the short-circuit current exceed the standard value and affect the normal operation of the power grid. Taking the Xiamen VSC-HVDC project as an example, this paper analyses the VSC-HVDC control mode, obtains the short-circuit current calculation method. The Xiamen AC / DC hybrid model is built, and the correctness of the proposed method is verified by simulation. The results show that the amplitude and phase angle of the VSC-HVDC short-circuit current have great influence on the total short-circuit current, and the amplitude is easily controlled by the current limiting controller, so the phase angle control should be emphasized. For Point of Common Coupling (PCC), the short-circuit current of single-phase grounding fault may be larger than three-phase grounding fault, which should be taken into account. The ideas provided in this paper have practical engineering significance for the city power supply by VSC-HVDC.

关键词： Reactive power Grounding Short-circuit currents simulation Urban areas System integration Transformers

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Morphological modifications of C60 crystal rods under hydrothermal conditions

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Chinese Physics B 2020年第12期29卷 506-510页

作者： Ming-Run Du Shi-Xin Liu Jia-Jun Dong Ze-Peng Li Ming-Chao Wang Tong Wei Qing-Jun Zhou Xiong Yang Peng-fei Shen College of Science Civil Aviation University of ChinaTianjin 300300China State Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 519055China

We observed morphological modification of rod-shaped C60 solvate crystals using a facile hydrothermal *** initial C60 rods were changed from smooth rods to rough rods,porous rods or pieces under different hydrothermal *** the hydrothermal treatment,the initial samples underwent a decomposition-recrystallization process,which can be tuned by the content of alcohol in the hydrothermal solution,thereby leading to modification of the morphological properties of the initial C60 *** addition,the rough and porous C60 rods prepared in our work exhibit excellent photoluminescence intensities that are approximately 7 and 3 times higher than those of pure C60 powders,*** results suggest that the hydrothermal method is a potential route for fabricating fullerene materials with controllable morphologies and novel functions.

关键词： fullerene crystals morphological modification porous materials hydrothermal method

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Model Based and Physics Informed Deep Learning Neural Network Structures

arXiv

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arXiv 2024年

作者： Mohammad-Djafari, Ali Chu, Ning Wang, Li Cai, Caifang Yu, Liang Bures sur Yvette91440 France Zhejiang Shangfeng special blower company Shaoxing312352 China Central South University Changsha China Khalifa University Abu Dhabi United Arab Emirates School of Civil Aviation Northwestern Polytechnical Univ. Xian710072 China State Key Laboratory of Airliner Integration Technology and Flight Simulation Shanghai200126 China

Neural Networks (NN) has been used in many areas with great success. When a NN’s structure (Model) is given, during the training steps, the parameters of the model are determined using an appropriate criterion and an optimization algorithm (Training). Then, the trained model can be used for the prediction or inference step (Testing). As there are also many hyperparameters, related to the optimization criteria and optimization algorithms, a validation step is necessary before its final use. One of the great difficulties is the choice of the NN’s structure. Even if there are many"on the shelf" networks, selecting or proposing a new appropriate network for a given data, signal or image processing, is still an open problem. In this work, we consider this problem using model based signal and image processing and inverse problems methods. We classify the methods in five classes, based on: i) Explicit analytical solutions, ii) Transform domain decomposition, iii) Operator Decomposition, iv) Optimization algorithms unfolding, and v) Physics Informed NN methods (PINN). Few examples in each category are explained. © 2024, CC BY.

关键词： Neural network models

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Effect of Dislocation Characteristics on Diamond Radiation Detector Performance by Affecting Dark Current

SSRN

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SSRN 2024年

作者： Mu, Lianxi Yuan, Xiaolu Feng, Zhelin Liu, Linyue Liu, Jinlong Chen, Liangxian Wei, Junjun Ouyang, Xiaoping Li, Chengming Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing100083 China School of Mechanical Engineering University of Science and Technology Beijing Beijing100083 China School of Energy and Power Engineering Xi'an Jiaotong University Xi’an710049 China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an710024 China School of Materials Science and Engineering Xiangtan University Xiangtan411105 China

The application of diamond radiation detectors in high-energy physics requires effective control of impurity content in the material. Microwave plasma chemical vapor deposition (MPCVD) technology has made significant progress in the synthesis of high-purity single crystal diamonds. However, when the impurity content is controlled to the ppb level, there are still significant differences in the performance of diamond radiation detectors. In this study, we prepared high-purity single-crystal CVD diamonds using self-made MPCVD equipment. Electron paramagnetic resonance (EPR) testing showed that the content of substituted nitrogen (Ns) impurities in diamonds were 0.77 and 1.04 ppb, respectively. The dislocation densities measured by X-ray rocking curves were 3.3 × 106 cm-2 and 4.7 × 106 cm-2, respectively. After metallization, the charge collection efficiency (CCE) of diamond radiation detectors were 12.61% and 98.27%, respectively. There are significant differences in CCE between diamond detectors. By studying the influence of dislocations and stress distribution in diamonds on dark current, it is believed that after controlling the content of Ns impurities in diamond, the effect of dislocations along the [110] direction on detector performance is greater than that in the [100] direction for diamonds with similar dislocation densities. This may be due to the easy decomposition of dislocations in the [110] direction, leading to unstable diamond growth process and resulting the non-homogeneous epitaxy. © 2024, The Authors. All rights reserved.

关键词： Dark currents

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Physical model for acoustic resonance in annular cavity structure

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Chinese Journal of Aeronautics 2020年第12期33卷 3228-3237页

作者： Fengtong ZHAO Mingsui YANG Xiaodong JING Deyou WANG Yundong SHA Yujin LIU School of Energy and Power Engineering Beihang UniversityBeijing 100083China Liaoning Province Key Laboratory of Advanced Measurement and Test Technology of Aviation Propulsion Systems Shenyang Aerospace UniversityShenyang 110136China Shenyang Engine Research Institute of AECC Shenyang 110015China

A physical model for acoustic resonance in the annular cavity structure is developed to represent the typical characteristic when acoustic resonance ***,the measurement of sound pressure in the casing and rotor blades vibration is operated in a multistage high pressure *** sharp peak frequency and discrete multi-tone occur in the frequency spectrum of sound pressure in the compressor,and the vibration of the first stage of rotor blades synchronously presents the high *** frequencies associated with rotor blades vibration can be calculated with rotating sound source *** is also confirmed that acoustic resonance occurs in the multistage *** acoustic similarity principle,an annular cavity model is established to simulate the typical characteristics of acoustic resonance in the compressor based on Large Eddy simulation(LES)and Lighthill acoustic *** coupling relationship between cavity acoustic mode and disc vibration mode shape is expounded when acoustic resonance occurs in the *** acoustic resonance will be locked in the certain flow rate *** these characteristics match well with those occur in the multistage high pressure compressor.

关键词： Acoustic resonance Annular cavity structure Large eddy simulation Lighthill acoustic analogy Multistage compressor

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