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Effect of samarium on the N_(2) selectivity of Sm_(x)Mn_(0.3-x)Ti catalysts during selective catalytic reduction of NO_(x) with NH_(3)

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International Journal of Minerals,Metallurgy and Materials 2023年第4期30卷 642-652页

作者： Shengyang zhang bolin zhang Boyu Wu Bo Liu Shengen zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China

This work aims to study the improvement effect of Sm on Mn-based catalysts for selective catalytic reduction (SCR) of NO with NH3.A series of Sm_(x)Mn_(0.3-x)-xTi catalysts (x=0,0.1,0.15,0.2,and 0.3) were prepared by *** tests indicated that the Sm_(0.15)Mn_(0.15)Ti catalyst showed superior performances,with a NO conversion of 100%and N_(2)selectivity above 87%at 180–300℃.The characterizations showed that Sm doping suppressed the crystallization of TiO_(2)and Mn2O3phases and increased the specific surface area and *** particular,the surface area increased from 152.2 m^(2)·g^(-1)for Mn0.3Ti to 241.7 m^(2)·g^(-1)for Sm_(0.15)Mn_(0.15)*** effects contributed to the high catalytic *** X-ray photoelectron spectroscopy (XPS) results indicated that the relative atomic ratios of Sm^(3+)/Sm and Oβ/O of Sm_(0.15)Mn_(0.15)Ti were 76.77at%and 44.11at%,*** presence of Sm contributed to an increase in surface-absorbed oxygen (Oβ) and a decrease in Mn^(4+)surface concentration,which improved the catalytic *** the results of hydrogen temperature-programmed reduction(H_(2)-TPR),the presence of Sm induced a higher reduction temperature and lower H_(2)consumption (0.3 mmol·g^(-1)) for the Sm_(0.15)Mn_(0.15)Ti catalyst compared to the Mn0.3Ti *** decrease in Mn^(4+)weakened the redox property of the catalysts and increased the N_(2)selectivity by suppressing N_(2)O formation from NH3oxidation and the nonselective catalytic reduction *** in situ diffuse reflectance infrared Fourier transform spectra (DRIFTs) revealed that NH3-SCR of NO over the Sm_(0.15)Mn_(0.15)Ti catalyst mainly followed the Eley–Rideal *** doping increased surface-absorbed oxygen and weakened the redox property to improve the NO conversion and N_(2)selectivity of the Sm_(0.15)Mn_(0.15)Ti catalyst.

关键词： manganese oxides nitric oxide nitrous oxide samarium selective catalytic reduction nitrogen selectivity

LPI radar signal detection based on the combination of FFT and segmented autocorrelation plus PAHT

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Journal of Systems Engineering and Electronics 2017年第5期28卷 890-899页

作者： Chengzhi Yang Zhiwei Xiong Yang Guo bolin zhang Department of Information Countermeasures Aviation University of Air Force College of Communication Engineering Jilin University Unit 94691 of PLA Unit 94810 of PLA

This paper proposes a desirable method to detect different kinds of low probability of intercept (LPI) radar signals, targeted at the main intra-pulse modulation method of LPI radar signals including the signals of linear frequency modulation, phase code, and frequency code. Firstly, it improves the coherent integration of LPI radar signals by adding the periodicity of the ambiguity function. Then, it develops a frequency domain detection method based on fast Fourier transform (FFT) and segmented autocorrelation function to detect signals without features of linear frequency modulation by virtue of the distribution characteristics of noise signals in the frequency domain. Finally, this paper gives a verification of the performance of the method for different signal-to-noise ratios by conducting simulation experiments, and compares the method with existing ones. Additionally, this method is characterized by the straightforward calculation and high real-time performance, which is conducive to better detecting all kinds of LPI radar signals.

关键词： low probability of intercept (LPI) signal detection period ambiguity function segmented autocorrelation channelization

Code Reviewer Intelligent Prediction in Open Source Industrial Software Project

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Computer Modeling in Engineering & Sciences 2023年第10期137卷 687-704页

作者： Zhifang Liao bolin zhang Xuechun Huang Song Yu Yan zhang School of Computer Science and Engineering Central South UniversityChangsha410083China Department of Computing School of ComputingEngineering and Built EnvironmentGlasgow Caledonian UniversityGlasgowG40BAUK

Currently, open-source software is gradually being integrated into industrial software, while industry protocolsin industrial software are also gradually transferred to open-source community development. Industrial protocolstandardization organizations are confronted with fragmented and numerous code PR (Pull Request) and informalproposals, and differentworkflowswill lead to increased operating costs. The open-source community maintenanceteam needs software that is more intelligent to guide the identification and classification of these issues. To solvethe above problems, this paper proposes a PR review prediction model based on multi-dimensional features. Weextract 43 features of PR and divide them into five dimensions: contributor, reviewer, software project, PR, andsocial network of developers. The model integrates the above five-dimensional features, and a prediction model isbuilt based on a Random Forest Classifier to predict the review results of PR. On the other hand, to improve thequality of rejected PRs, we focus on problems raised in the review process and review comments of similar *** a PR revision recommendation model based on the PR review knowledge graph. Entity information andrelationships between entities are extracted from text and code information of PRs, historical review comments,and related issues. PR revisions will be recommended to code contributors by graph-based similarity *** experimental results illustrate that the above twomodels are effective and robust in PR review result predictionand PR revision recommendation.

关键词： Open source software pull request random forest knowledge graph

Promotion effect of niobium on ceria catalyst for selective catalytic reduction of NO with NH3

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Journal of Rare Earths 2022年第10期40卷 1535-1545页

作者： bolin zhang Lifeng Deng Michael Liebau Yingjie Ren Chunyun Luo Bo Liu Shengen zhang Roger Glaser Institute for Advanced Materials and Technology University of Science and Technology BeijingBejing 100083China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China Jiangsu Longkingcotech Co. Ltd.Yancheng224000China Institute of Chemical Technology Universit at LeipzigLeipzig04103Germany

The CeO_(2),Ce-Nb-O_(x) and Nb_(2)O_(5) catalysts were synthesized by citric acid method and the promotion effect of Nb on ceria for selective catalytic reduction(SCR)of NO with NH_(3) was *** catalytic activity measurements indicate that the mixed oxide Ce-Nb-O_(x) presents a higher SCR activity than the single oxide CeO_(2) or Nb_(2)O_(5) *** addition,the Ce-Nb-O_(x) catalyst shows high resistance towards H_(2)O and SO_(2) at 280℃.The Raman,X-ray photoelectron spectra and temperature programmed reduction with H_(2) results indicate that the incorporation of Nb provides abundant oxygen vacancies for capturing more surface adsorbed oxygen,which provides a superior redox capability and accelerates the renewal of active ***,the Fourier transform infrared spectra and temperature programmed desorption of NH_(3) results suggest that niobium pentoxide shows high surface acidity,which is partly retained in the Ce-Nb-O_(x) catalyst possessing a high content of Lewis and Br?nsted acid ***,the incorporation of Nb improves both the redox and acidic capacities of Ce-Nb-O_(x) catalyst for the SCR ***,the redox behavior is primarily taken on Ce and the acidity is well improved by Nb,so the synergistic effect should exist between Ce and *** terms of the reaction mechanism,in situ DRIFT experiments suggest that both NH_(3) on Lewis acid sites and NH_(4)^(+) on Bronsted acid sites can react with NO species,and adsorbed NO and NO_(2) species can both be reduced by NH_(3).In the SCR process,O_(2) primarily acts as the accelerant to improve the redox and acid cycles and plays an important *** work proves that the combination of redox and acidic properties of different constituents can be feasible for catalyst design to obtain a superior SCR performance.

关键词： Cerium-niobium Selective catalytic reduction Redox behavior Acid cycle Synergistic effect Rare earths

MAGAN:Unsupervised Low-Light Image Enhancement Guided by Mixed-Attention

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Big Data Mining and Analytics 2022年第2期5卷 110-119页

作者： Renjun Wang Bin Jiang Chao Yang Qiao Li bolin zhang the College of Computer Science and Electronic Engineering Hunan UniversityChangsha 410006China

Most learning-based low-light image enhancement methods typically suffer from two ***,they require a large amount of paired data for training,which are difficult to acquire in most ***,in the process of enhancement,image noise is difficult to be removed and may even be *** other words,performing denoising and illumination enhancement at the same time is *** an alternative to supervised learning strategies that use a large amount of paired data,as presented in previous work,this paper presents an mixed-attention guided generative adversarial network called MAGAN for low-light image enhancement in a fully unsupervised *** introduce a mixed-attention module layer,which can model the relationship between each pixel and feature of the *** this way,our network can enhance a low-light image and remove its noise *** addition,we conduct extensive experiments on paired and no-reference datasets to show the superiority of our method in enhancing low-light images.

关键词： low-light image enhancement unsupervised learning Generative Adversarial Network(GAN) mixedattention

BDGOA:A bot detection approach for GitHub OAuth Apps

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Intelligent and Converged Networks 2023年第3期4卷 181-197页

作者： Zhifang Liao Xuechun Huang bolin zhang Jinsong Wu Yu Cheng the School of Computer Science and Engineering Central South UniversityChangsha 410083China the School of Artificial Intelligence Guilin University of Electronic TechnologyGuilin 541004China the Department of Electrical Engineering University of ChileSantiago 8320000 Hunan Glozeal Science and Technology Co. Ltd.Changsha 410083China

As various software bots are widely used in open source software repositories,some drawbacks are coming to light,such as giving newcomers non-positive feedback and misleading empirical studies of software engineering *** techniques have been proposed by researchers to perform bot detection,but most of them are limited to identifying bots performing specific activities,let alone distinguishing between GitHub App and OAuth *** this paper,we propose a bot detection technique for OAuth App,named BDGOA.24 features are used in BDGOA,which can be divided into three dimensions:account information,account activity,and text *** better explore the behavioral features,we define a fine-grained classification of behavioral events and introduce self-similarity to quantify the repeatability of behavioral *** leverage five machine learning classifiers on the benchmark dataset to conduct bot detection,and finally choose random forest as the classifier,which achieves the highest F1-score of 95.83%.The experimental results comparing with the state-of-the-art approaches also demonstrate the superiority of BDGOA.

关键词： Github DevBots machine learning text similarity

SYNTHESIS AND CRYSTAL STRUCTURE OF A NEW COMPOUND Sr_6Sn_2Nb_8O_30

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Journal of Wuhan University of Technology(Materials Science) 1999年第2期14卷 35-39页

作者： FANG Liang zhang Hui WU bolin YUAN Runzhang Wuhan University of Technology Wuhan University of Technology China State Key Lab. Adv. Tech. Mater. S. Wuhan Univ. of Tech. Wuhan 430070 China

A new compound Sr6Sn2Nb8O30 was found in the ternary system of SrO-SnO2-Nb2O5. The transparent colorless crystal with needle-like shape can be grown by flux method. The crystal structure of new compound was determined by X-ray diffraction, and its belongs to tungsten bronze structure. Sr6Sn2Nb8O30 crystallizes in orthorhombic system with unit cell parameters a= 17. 579 (DA,6= 17. 509(DA,c=7. 7880(5)A,Z = 4 and space group Cmm2.

关键词： Sr_6Sn_2Nb_8O_30 system new compound tungsten bronze structure

ZERO TRANSMISSION AND ITS APPLICATION IN HIGH SPEED CNC MACHINE TOOLS

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Chinese Journal of Mechanical Engineering 2000年第3期13卷 184-189页

作者： zhang bolin, Ma Ping, Xiao Shuhong ,Li Yiping, Xiao zhanglin (Department of Mechanical and Electronical Engineering,Guangdong University of Technology) 广东工业大学广东广州

In order to realize high speed machining,the special requirements for the transmission and sturctrue of CNC machine tool have to be satisfied.A high speed spindle unit driven by a built-in motor is *** oil-water heat exchange system is used for cooling the spindle *** spindle is supported by Si_4N_3 ceramic ball angular contact bearings. An oil-air lubricator is used to lubricate and cool the spindle *** special structures are taken for balancing the spindle.

关键词： High speed machining Machine tool Spindle Ceramic ball bearing\

A HIGH VELOCITY FEED UNIT DRIVEN BY LINEAR MOTOR

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Chinese Journal of Mechanical Engineering 2000年第4期13卷 266-272页

作者： zhang bolin Chen Yanji Li Zhiying Liu Yurong Luo Yong (Department of Mechanical and Electronical Engineering， Guangdong University of Technology) 广东工业大学广东广州

In order to realize high speed machining, the special requirements for feed transmission system of the CNC machine tool have to be satisfied. A high velocity feed unit driven by a induction linear motor is developed. ... 详细信息

关键词： High speed machining Machine tool Feed system Linear motor