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Investigation on plume interference effect of solid propellant micro-thruster

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航空动力学报 2011年第9期26卷 2027-2031页

作者： ZhANG Bin mao Gen-wang hU Song-qi ChEN mao-lin （National Key Laboratory of Combustion Flow and Thermo-Structure College of Astronautics Northwestern Polytechnical University Xi＇an 710072 China

The three-dimensional numerical simulation of two-phase plume flow of solid propellant micro-thrusters was *** it was used to investigate the plume interference effect by combining the direct simulation Monte Carlo(DSMC) method for multi-component gas flow with the two-way coupling model for two-phase rarefied *** different space between the two micro-thrusters and different wall temperature,the plume interference effect was analyzed *** results show that under the plume interference effect the gas is compressed and the flow direction is changed,which resulted in the increasing of gas pressure and temperature;solid phase made no significant effect on the flow parameters of gas phase;with the rising of the space between the two micro-thrusters,the maximum pressure decreased and the maximum temperature increased in the domain under the plume interference effect;the wall temperature could influence the temperature of the gas which is extremely close to the wall,but not the gas pressure.

关键词： solid propellant micro-thruster plume interference effect two-phase plume flow catalytic decomposition specific impulse

RFID-based 3D human pose tracking: A subject generalization approach

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Digital Communications and Networks 2022年第3期8卷 278-288页

作者： Chao Yang Xuyu Wang Shiwen mao Dept.of Electrical and Computer Engineering Auburn UniversityAuburnAL36849-5201USA Dept.of Computer Science California State UniversitySacramentoCA95819-6021USA

Three-dimensional (3D) human pose tracking has recently attracted more and more attention in the computer vision field. Real-time pose tracking is highly useful in various domains such as video surveillance, somatosensory games, and human-computer interaction. however, vision-based pose tracking techniques usually raise privacy concerns, making human pose tracking without vision data usage an important problem. Thus, we propose using Radio Frequency Identification (RFID) as a pose tracking technique via a low-cost wearable sensing device. Although our prior work illustrated how deep learning could transfer RFID data into real-time human poses, generalization for different subjects remains challenging. This paper proposes a subject-adaptive technique to address this generalization problem. In the proposed system, termed Cycle-Pose, we leverage a cross-skeleton learning structure to improve the adaptability of the deep learning model to different human skeletons. Moreover, our novel cycle kinematic network is proposed for unpaired RFID and labeled pose data from different subjects. The Cycle-Pose system is implemented and evaluated by comparing its prototype with a traditional RFID pose tracking system. The experimental results demonstrate that Cycle-Pose can achieve lower estimation error and better subject generalization than the traditional system.

关键词： Radio-frequency identification(RFID) Three-dimensional(3D)human pose tracking Cycle-consistent adversarial network Generalization

Microstructures and soft magnetic properties of Fe_(73.5)Cu_(1)Nb_(3-x)Si_(13.5)B_(9)Yx(x=0-1.5)alloys

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journal of Rare Earths 2021年第11期39卷 1402-1408,I0004页

作者： Yuchen mao Zhenghou Zhu hui Zhao College of Materials Science and Engineering Nanchang UniversityNanchang 330031China Dayou Technology Co. Ltd.Yichun 336000China Institute of Space Science and Technology Nanchang UniversityNanchang 330031China

Based on composition of Finemet alloy,structures and soft magnetic properties of Fe_(73.5)Cu_(1)Nb_(3-x)Si_(13.5)B_(9)Yx(x=0,0.5,1.0,1.5)alloys formed by replacing Nb(niobium)by Y(yttrium)were studied in this *** research results show that when x=0 or 0.5,rapidly solidified as-cast alloy is Fe amorphous single-phase structure,and Y atoms are dispersed in matrix;when x=1.0 or 1.5,crystalline phase ***_(73.5)Cu_(1)Nb_(3-x)Si_(13.5)B_(9)Yx(x=0,0.5,1.0,1.5)alloys begin to precipitateα-Fe(Si)solid solution phase after crystallization annealing above 480℃,when x=0.5,grain size is 12.6 nm,which shows that Y can replace Nb in small amount and refine grain ***_(73.5)Cu_(1)Nb_(2.5)Si_(13.5)B_(9)Y_(0.5)alloy has excellent soft magnetic properties:μm value is 813.1×10^(3),which is 36%higher than that of Finemet alloy;μi value is 154.6×10^(3),close to that of Finemet alloy,and BS and hc values are 1.24 T and 0.56 A/m,respectively,better than those of Finemet *** addition,Fe_(73.5)Cu_(1)Nb_(2.5)Si_(13.5)B_(9)Y_(0.5)alloy has excellent soft magnetic properties at high temperature,μe value only reduces by 8.8%at 1 khz with ambient temperature increased from 30 to150℃,andμe value is 128.02×10^(3)in 150℃,which is 15.74%higher than that of Finemet alloy.

关键词： Iron-based amorphous alloys Soft magnetic properties Rare earth Yttrium

Perovskite tandem solar cells with improved efficiency and stability

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journal of Energy Chemistry 2021年第7期30卷 219-232页

作者： Zhengjie Zhu Kaitian mao jixian Xu hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026AnhuiChina Fujian Science&Technology Innovation Laboratory for Energy Devices of China(21C-LAB) Ningde 352100FujianChina

Tandem solar cells represent an attractive technology to overcome the Shockley-Queisser limit of single-junction ***,wide-bandgap metal halide perovskites are paired with complementary bandgap photovoltaic technologies(such as silicon,CIGS,and low-bandgap perovskites) in tandem architectures,enabling a pathway to achieve industry goals of pushing power-conversion-efficiency(PCE) over 30% at low *** this review of perovskite tandems,we aim to present an overview of their recent progress on efficiency and stability *** start by comparing 2-terminal and 4-terminal tandems,from the perspective of technical and cost *** then focus on 2-terminal tandems and summarize the collective efforts on improving their performance,fabrication processing,and operational *** also present the comprehensive progress in perovskite/Si, perovskite/CIGS,and perovskite/perovskite monolithic tandems,alo ng with advanced technology for subcell *** highlight that an in-depth understanding of the mobile ion character of perovskites and applying consensus stability tests(such as the extended ISOS protocol for perovskite) under light,heating,and voltage bias are critically important for improving perovskite tandems toward 25-year outdoor operation lifetime.

关键词： Tandem solar cells Perovskite/Si Perovskite/CIGS Perovskite/perovskite Perovskite solar cells

Federated Learning Based on Data Divergence and Differential Privacy in Financial Risk Control Research

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Computers, Materials & Continua 2023年第4期75卷 863-878页

作者： mao Yuxin Wang honglin School of Artificial Intelligence/School of Future Technology Nanjing University of Information Science and TechnologyNanjing210044China

In the financial sector, data are highly confidential and sensitive,and ensuring data privacy is critical. Sample fusion is the basis of horizontalfederation learning, but it is suitable only for scenarios where customershave the same format but different targets, namely for scenarios with strongfeature overlapping and weak user overlapping. To solve this limitation, thispaper proposes a federated learning-based model with local data sharing anddifferential privacy. The indexing mechanism of differential privacy is used toobtain different degrees of privacy budgets, which are applied to the gradientaccording to the contribution degree to ensure privacy without affectingaccuracy. In addition, data sharing is performed to improve the utility ofthe global model. Further, the distributed prediction model is used to predictcustomers’ loan propensity on the premise of protecting user privacy. Usingan aggregation mechanism based on federated learning can help to train themodel on distributed data without exposing local data. The proposed methodis verified by experiments, and experimental results show that for non-iiddata, the proposed method can effectively improve data accuracy and reducethe impact of sample tilt. The proposed method can be extended to edgecomputing, blockchain, and the Industrial Internet of Things (IIoT) *** theoretical analysis and experimental results show that the proposedmethod can ensure the privacy and accuracy of the federated learning processand can also improve the model utility for non-iid data by 7% compared tothe federated averaging method (FedAvg).

关键词： Data privacy federated learning machine learning data difference

Geochronology of the Gabbro-mafic Microgranular Enclaves-granite Associations in the Gejiu District, Yunnan Province and Their Geodynamic Significance

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Acta Geologica Sinica(English Edition) 2012年第3期86卷 748-761页

作者： ChENG Yanbo mao jingwen Faculty of the Earth Sciences andResources China University of GeosciencesBeijing 100083 School of Earth and Environmental Sciences James Cook UniversityTownsville4811Australia MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing100037

Many igneous rocks distribute in Gejiu tin polymetallic ore-field at Yunnan province, rocks including basalt, gabbro, mafic microgranular enclaves, granites （porphyritic granite and equigranular granite） and akaline rocks. The ages of the granites and akaline rocks which are considered to have genetic connecting with the mineralization have been comfirmed, but the gabbro- mafic microgranular enclaves-granite assemblage＇s ages are still unknown. By means of LA-ICP-MS zircon U-Pb dating, the data of Shenxianshui equigranular granite, the mafic microgranular enclave in jiasha area, the host rock of the mafic microgranular enclaves and the jiasha gabbro are around ~80 Ma. Besides the above mentioned data, a group of new ages at ~30 Ma were discovered in this study, which is from gabbro and mafic microgranular enclaves. Based on the previous data and the new data gained this time, we suggest the major geochronology framework of the magmatism and mineralization events in Gejiu area is ~80 Ma, which is consistent with the Late Cretaceous magmatism and mineralization events in the whole southeast Yunnan and west Guangxi area and they were suggested to belong to the same geotectonic setting in late Yenshannian. And the new ages of the ~30 Ma obtained in this study is considered to represent a responding to the complicate tectonic evolution history of the Tibetan orogenic events in Cenozoic.

关键词： gabbro granite mafic microgranular enclaves geochronology geodynamic setting Gejiu

history-dependent percolation on multiplex networks

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National Science Review 2020年第8期7卷 1296-1305页

作者： Ming Li Linyuan Lü Youjin Deng mao-Bin hu hao Wang Matú? Medo h.Eugene Stanley Department of Thermal Science and Energy Engineering University of Science and Technology of China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Alibaba Research Center for Complexity Sciences Hangzhou Normal University Beijing Computational Science Research Center hefei National Laboratory for Physical Sciences at Microscale Department of Modern Physics and CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Department of Physics and Center for Polymer Studies Boston University

The structure of interconnected systems and its impact on the system dynamics is a much-studied cross-disciplinary topic. Although various critical phenomena have been found in different models, study of the connections between different percolation transitions is still lacking. here we propose a unified framework to study the origins of the discontinuous transitions of the percolation process on interacting networks. The model evolves in generations with the result of the present percolation depending on the previous state, and thus is history-dependent. Both theoretical analysis and Monte Carlo simulations reveal that the nature of the transition remains the same at finite generations but exhibits an abrupt change for the infinite generation. We use brain functional correlation and morphological similarity data to show that our model also provides a general method to explore the network structure and can contribute to many practical applications, such as detecting the abnormal structures of human brain networks.

关键词： percolation multiplex networks critical phenomena brain networks

Applications of the SW96 formulation in the thermodynamic calculation of fluid inclusions and mineral-fluid equilibria

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Geoscience Frontiers 2017年第6期8卷 1397-1403页

作者： jia Zhang Shide mao School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China

The SW96 formulation explicit in helmholtz free energy proposed by Span and Wagner(1996)is the most accurate multifunction equation of state of CO_2 fluid,from which all thermodynamic properties can be obtained over a wide temperature-pressure range from 216.592 to 1100 K and from 0 to 8000 bar with or close to experimental *** paper reports the applications of the SW96 formulation in fluid inclusions and mineral-fluid equilibria.A reliable and highly efficient algorithm is presented for the saturated properties of CO_2 so that the formulation can be conveniently applied in the study of fluid inclusions,such as calculation of homogenization pressures,homogenization densities(or molar volumes),volume fractions of vapor phase and ***,the univariant curves of some typical decarbonation reactions of minerals are calculated with the SW96 formulation and relevant thermodynamic models of *** computer code of the SW96 formulation can be obtained from the corresponding author.

关键词： Equation of state CO2 Fluid inclusion Application

Embryonic expression and evolutionary analysis of the amphioxus Dickkopf and Kremen family genes

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journal of Genetics and Genomics 2010年第9期37卷 637-645页

作者： Yujun Zhang Bingyu mao State Key Laboratory of Genetic Resources and Evolution Kunming Institute of Zoology Chinese Academy of Sciences Kunming 650223 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The secreted Wnt signaling inhibitor Dickkopfl （Dkkl） plays key role in vertebrate head induction. Its receptor Kremen synergizes with Dkkl in Wnt inhibition. here we have carried out expression and functional studies of the Dkk and Kremen genes in amphioxus （Branchiostoma belcheri）. During embryonic and larval development, BbDkkl/2/4 is expressed in the posterior mesoendoderm, anterior somatic mesoderm and the pharyngeal regions. Its expression becomes restricted to the pharyngeal region on the left side at larval stages. In 45 h larvae, BbDkkl/2/4 is expressed specifically in the cerebral vesicle. BbDkk3 was only detected at larval stages in the mid-intestine region. Seven Kremen related genes were identified in the genome of the Florida amphioxus （Branchiostoma floridae）, clustered in 4 scaffolds, and are designated Kremenl-4 and Kremen-like 1-3, respectively. In B. belcheri, Kremenl is strongly expressed in the mesoendoderm during early development and Kremen3 is expressed asymmetrically in spots in the larval pharyngeal region. In luciferase reporter assays, BbDkkl/2/4 can strongly inhibit Wnt signaling, while BbDkk3, BbKremenl and BbKremen3 can not. No co-operative effect was observed between amphioxus Dkkl/2/4 and Kremens, suggesting that the interaction between Dkk and Kremen likely originated later during evolution.

关键词： amphioxus Dickkopf Kremen evolution expression pattern