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An Intelligent Ellipsoid Calibration Method Based on the Grey Wolf Algorithm for Magnetic Compass

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Journal of Bionic Engineering 2021年第2期18卷 453-461页

作者： Xusheng Lei xiaoyu Zhang Yankun Hao School of the Instrumentation Science and Opto-Electronic Engineering Beihang UniversityBeijing 100191China

With the measurement of the Earth’s magnetic field,magnetic compass can provide high frequency heading ***,it suffers from local magnetic *** intelligent ellipsoid calibration method based on the grey wolf is proposed to generate optimal parameters for magnetic compass to generate high performance heading *** the analysis of the projection relationship among the navigation coordinate frame,the body frame and the local horizontal frame,the heading ellipsoid equation is ***,an improved grey wolf algorithm is proposed to find optimization solution in a large solution *** the improvement of the convergence factor and the evolutionary mechanism,the improved grey wolf algorithm can generate optimized solution for heading ellipsoid *** effectiveness of the proposed method has been verified by a series of vehicle and flight *** experimental results show that the proposed method can eliminate errors caused by sensor defects,hard-iron interference,and soft-iron interference *** heading error generated by the magnetic compass is less than 0.2162 degree in real flight tests.

关键词： magnetic compass ellipsoid parameters grey wolf algorithm error model

Alginate Composite Hydrogel Bead with Multilayer Flake Structure for Dye Adsorptions

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Journal of Renewable Materials 2019年第10期7卷 983-996页

作者： xiaoyu Chen Jie Zhu School of Material Engineering Jinling Institute of TechnologyNanjing211169China

With the rapid development of textile industry,a large amount of dye-contaminated effluents was produced and caused serious environmental *** remove the dye from effluents,adsorption materials have been applied because of their relatively cheap,high efficiency,and easy *** this study,a novel composite hydrogel bead with unique multilayer flake structure was fabricated by alginate,acrylamide and attapulgite for dye *** was grafted polymerization onto alginate to obtain alginate-g-poly(acrylamide).Then alginate-g-poly(acrylamide)was cross-linked by Ca2+ions in present of attapulgite to form composite hydrogel *** electron microscopy(SEM)results show that the freeze dried composite hydrogel bead has multilayer flake structure incorporating *** transform infrared spectroscopy(FTIR)and Thermo-gravimetric analysis(TGA)results indicate that acrylamide has been successfully grafted polymerization on sodium *** polymerization of acrylamide onto sodium alginate obviously enhances the swelling of hydrogel *** of attapulgite into hydrogel bead effectively enhances the adsorption capacity to methylene blue and the maximum adsorption capacity is 155.7 mg *** flake structure increases the adsorption area for methylene blue,but hinders the diffusion of methylene blue into the inner of composite hydrogel *** pH solution is beneficial to the ***-second order model and Fraundlinch model best describe the adsorption kinetic and isotherm,*** results indicate that composite hydrogel bead is a promising adsorption material for dye-contaminated water treatment.

关键词： Composite hydrogel attapulgite alginate acrylamide methylene blue adsorption material

Multi-Label Image Classification Based on Object Detection and Dynamic Graph Convolutional Networks

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Computers, Materials & Continua 2024年第9期80卷 4413-4432页

作者： xiaoyu Liu Yong Hu School of Cyber Science and Engineering Sichuan UniversityChengdu610207China

Multi-label image classification is recognized as an important task within the field of computer vision,a discipline that has experienced a significant escalation in research endeavors in recent *** widespread adoption of convolutional neural networks(CNNs)has catalyzed the remarkable success of architectures such as ResNet-101 within the domain of image ***,inmulti-label image classification tasks,it is crucial to consider the correlation between *** order to improve the accuracy and performance of multi-label classification and fully combine visual and semantic features,many existing studies use graph convolutional networks(GCN)for *** detection and multi-label image classification exhibit a degree of conceptual overlap;however,the integration of these two tasks within a unified framework has been relatively underexplored in the existing *** this paper,we come up with Object-GCN framework,a model combining object detection network YOLOv5 and graph convolutional network,and we carry out a thorough experimental analysis using a range of well-established public *** designed framework Object-GCN achieves significantly better performance than existing studies in public datasets COCO2014,VOC2007,*** final results achieved are 86.9%,96.7%,and 96.3%mean Average Precision(mAP)across the three datasets.

关键词： Deep learning multi-label image recognition object detection graph convolution networks

Combining microbial and chemical syntheses for the production of complex naturalproducts

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Chinese Journal of Natural Medicines 2022年第10期20卷 729-736页

作者： ZHANG Haili TANG xiaoyu Institute of Chemical Biology Shenzhen Bay LaboratoryShenzhen 518132China

Nature,a rich source of bioactive natural products,serves as a massive pool of drug candidates for the pharmaceutical ***,the supply of these structurally complex chemicals is costly as most of the natural products are scarce in nature,thus requiring de novo *** supply chain issue hinders the development of novel therapeutic agents from natural *** synthesis,based on the expression of biosynthetic genes in a suitable microbial host to produce certain chemicals,is a sustainable strategy to produce complex natural ***,this strategy requires gaining insights into the biosynthesis of target *** natural products are biosynthetically unknown or not fully elucidated;thus,the sole application of microbial synthesis strategy to produce a given molecule is *** this review,we highlight a strategy that combines microbial and chemical syntheses to tackle the supply chain issue in developing drugs from natural *** believe this strategy can revive the drug development pipeline for natural products.

关键词： Microbial Chemical syntheses Biosynthesis Brasilicardins

A comparative process simulation study of Ca-Cu looping involving post-combustion CO2 capture

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2382-2390页

作者： xiaoyu Wang Haibo Zhao Mingze Su State Key Laboratory of Coal Combustion School of Energy and Power EngineeringHuazhong University of Science and TechnologyWuhan 430074China

This work presents a simulation study of several Ca-Cu looping variants with CO(2)capture,aiming at both parameter optimization and exergy analysis of these Ca-Cu looping *** kinds of Ca-Cu looping are considered:(1)carbonation-calcination/reduction-oxidation;(2)carbonation-oxidation-calcination/reduction and (3)carbona tion/oxidation-calcination/reduction.A conventional Ca looping is also simulated for *** influences of the calcination temperature on the mole fractions of CO(2)and CaO at the calciner outlet,the CaCO3 flow rate on the carbonator performance and the Cu/Ca ratio on the calciner performance are *** second kind of Ca-Cu looping has the highest carbonation *** 1×10^5 Pa and 820℃,complete decomposition of CaCO3 can be achieved in three Ca-Cu looping systems,while the operation condition of 1×10^5 Pa,840℃is required for the conventional Ca looping ***,the Cu/Ca molar ratio of 5.13-5.19 is required for the Ca-Cu *** analyses show that the maximum exergy destruction occurs in the calciner for the four modes and the second Ca-Cu looping system(i.e.,carbonation-oxidation-calcination/reduction)performs the highest exergy efficiency,up to 65.04%,which is about 30%higher than that of the conventional Ca looping.

关键词： Ca-Cu looping CO2 capture Process systems Numerical simulation Exergy

Surface-anchoring zwitterionic antioxidant enables efficient,stable,and scalable all-perovskite tandem solar cells

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Science China Chemistry 2021年第1期64卷 3-4页

作者： xiaoyu Yang Rui Zhu State Key Laboratory for Artificial Microstructure and Mesoscopic Physics School of PhysicsFrontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum MatterPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of Optoelectronics Nantong 226010China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Lead-halide perovskite photovoltaics(PVs)have achieved impressive progress in power conversion efficiencies(PCEs)over the past ten years,accelerating their step forward to next-generation commercial PV technologies[1].As a leading candidate for perovskite PVs,monolithic all-perovskite tandem solar cells(PTSCs)have achieved the best24.8%for small-area devices(0.049 cm^2)in 2019。

关键词： perovskite enable impressive

一株同步硝化反硝化菌株的筛选及其生物电化学脱氮性能研究

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南京农业大学学报 2025年第1期48卷 133-143页

作者：田瑞瑞付欢郑云黄新琦周俊雍晓雨南京工业大学生物与制药工程学院江苏南京211816 南京师范大学地理科学学院江苏南京210023

[目的]本文旨在获得具有高效脱氮性能的异养硝化-好氧反硝化(heterotrophic nitrification-aerobic denitrification,HN-AD)功能菌株,构建生物电化学-同步硝化反硝化(bio-electrochemical systems-simultaneous nitrification and denitrification,BES-SND)耦合系统,实现脱氮效率的提升。[方法]从活性污泥中筛选HN-AD菌株,鉴定后通过摇瓶试验分析其脱氮性能。然后进一步研究碳源、C/N、溶解氧等外界因素对菌株同步硝化反硝化性能的影响。将菌株接种到微生物燃料电池(microbial fuel cells,MFC)的生物阴极,分析低C/N条件下BES-SND体系的脱氮性能。[结果]从活性污泥中筛选出一株具有同步硝化反硝化性能的HN-AD菌株,命名为Alcaligenes aquatilis N3。确定该菌株发生SND反应的最适碳源为乙酸钠、C/N值为20、溶解氧为3.70 mg·L^(-1)。在BES-SND脱氮体系中,C/N值分别为2、4、6、8时,菌株*** N3的总氮去除率分别为20.51%、26.67%、37.76%和48.50%。在C/N=2的试验条件下,BES-SND系统的总氮去除速率在第5天仍为1.79 mg·L^(-1)·d^(-1)。[结论]在低碳环境下,*** N3菌株依然可以在BES-SND耦合脱氮体系中实现脱氮,降低了脱氮过程对碳源的依赖性,具有一定的实际环境应用潜力。

关键词：同步硝化反硝化异养硝化-好氧反硝化生物电化学低C/N值微生物燃料电池

STOCHASTIC TRUST-REGION METHODS WITH TRUST-REGION RADIUS DEPENDING ON PROBABILISTIC MODELS

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Journal of Computational Mathematics 2022年第2期40卷 294-334页

作者： xiaoyu Wang Ya-xiang Yuan Institute of Computational Mathematics and Scientific/Engineering Computing Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Scientific/Engineering Computing Institute of Computational Mathematics and Scientific/Engineering ComputingAcademy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China

We present a stochastic trust-region model-based framework in which its radius is related to the probabilistic ***,we propose a specific algorithm termed STRME,in which the trust-region radius depends linearly on the gradient used to define the latest *** complexity results of the STRME method in nonconvex,convex and strongly convex settings are presented,which match those of the existing algorithms based on probabilistic *** addition,several numerical experiments are carried out to reveal the benefits of the proposed methods compared to the existing stochastic trust-region methods and other relevant stochastic gradient methods.

关键词： Trust-region methods,Stochastic optimization Probabilistic models Trust-region radius Global convergence

Exfoliated Mg–Al–Fe layered double hydroxides/polyether sulfone mixed matrix membranes for adsorption of phosphate and fluoride from aqueous solutions

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Journal of Environmental Sciences 2018年第8期30卷 63-73页

作者： Zhiqian Jia Shuang Hao xiaoyu Lu Lab for Membrane Science and Technology College of Chemistry Beijing Normal University

Mg–Al–Fe layered double hydroxides（LDHs） were exfoliated and incorporated in polyether sulfone membranes for the removal of phosphate and fluoride for the first time. The exfoliation methods, coagulation bath, LDH amount, interfering ions, adsorption isotherm,desorption and reuse of the membranes were investigated. It was found that LDHs could be quickly exfoliated in formamide/N,N-dimethylformamide（DMF） solvent mixtures with sodium carboxymethyl cellulose as a stabilizer. The membranes displayed much higher adsorption capacity for phosphate（5.61 mg/g） and faster adsorption rate than the unexfoliated materials. With increased DMF content in the coagulation bath, the static and dynamic adsorption capacity rose. Interference from Cl-and SO4^（2-）（50 mg/L） on adsorption of phosphates was not apparent. The membranes displayed excellent reusability in dynamic adsorption/desorption. The membranes also showed high adsorption capacity for fluorides（1.61 mg/g）.

关键词： Layered double hydroxides Membrane Adsorption Phosphate Fluoride Exfoliation