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Enhanced Surface Mechanical Properties and Microstructure Evolution of Commercial Pure Titanium Under Electropulsing-Assisted Ultrasonic Surface Rolling Process

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Acta Metallurgica Sinica(English Letters) 2018年第12期31卷 1272-1280页

作者： Yong-Da Ye Xiao-Pei Li Zhi-Yan sun Hai-Bo Wang guo-yi Tang Advanced Materials Institute Graduate School at ShenzhenTsinghua University School of Materials Science and Engineering Tsinghua University

The effects of electropulsing-assisted ultrasonic surface rolling process on surface mechanical properties andmicrostructure evolution of commercial pure titanium were investigated. It was found that the surface mechanical prop-erties were significantly enhanced compared to traditional ultrasonic surface rolling process （USRP）, leading to smallersurface roughness and smoother morphology with fewer cracks and defects. Moreover, surface strengthened layer wasremarkably enhanced with deeper severe plastic deformation layer and higher surface hardness. Remarkable enhancementsof surface mechanical properties may be related to the gradient refined microstructure, the enhanced severe plasticdeformation layer and the accelerated formation of sub-boundaries and twins induced by coupling effects of USRP andelectropulsing. The primary intrinsic reasons for these improvements may be attributed to the thermal and athermal effectscaused by electropulsing treatment, which would accelerate dislocation mobility and atom diffusion.

关键词： Electropulsing-assisted ultrasonic surface rolling process (EP-USRP) Commercial pure titanium Roughness Hardness Microstructure evolution

Large-Capacity and High-Speed Instruction Cache Based on Divide-by-2 Memory Banks

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Journal of Electronic Science and Technology 2021年第4期19卷 335-349页

作者： Qing-Qing Li Zhi-guo Yu yi sun Jing-He Wei Xiao-Feng Gu with the Engineering Research Center of IoT Technology Applications(Ministry of Education) Jiangnan UniversityWuxi 214122 with the No.58 Research Institute China Electronics Technology Group CorporationWuxi 214035

An increase in the cache capacity is usually accompanied by a decrease in access *** balance the capacity and performance of caches,this paper proposes an instruction cache(ICache)architecture based on divide-by-2 memory banks(D2MB-ICache).The control circuit and memory banks of D2MB-ICache work at the central processing unit(CPU)frequency and the divide-by-2 CPU frequency,respectively,so that the capacity of D2MB-ICache can be expanded without lowering its *** sequential access,D2MB-ICache can output the required instruction from memory banks per CPU cycle by dividing the memory banks with a partition mechanism and employing an inversed clock *** non-sequential access,D2MB-ICache will fetch certain jump instructions one or two more times,so that it can catch the jump of the request address in time and send the correct instruction to the *** results show that,compared with conventional ICache,D2MB-ICaches with the same and double capacities show a maximum frequency increase by an average of 14.6%and 6.8%,and a performance improvement by an average of 10.3%and 3.8%,***,energy efficiency of 64-kB D2MB-ICache is improved by 24.3%.

关键词： Cache capacity expansion divide-by-2 frequency instruction cache(ICache) inversed clock.

Outlier Analysis for Gene Expression Data

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Journal of Computer Science & Technology 2004年第1期19卷 13-21页

作者： ChaoYan guo-LiangChen yi-FeiShen NationalHighPerformanceComputationalCenter UniversiLyofScienceandTechnologyofChinaHefei230027P.R.China

The rapid developments of technologies that generate arrays of gene dataenable a global view of the transcription levels of hundreds of thousands of genes *** outlier detection problem for gene data has its importance but together with the difficulty ofhigh dimensionality. The sparsity of data in high-dimensional space makes each point a relativelygood outlier in the view of traditional distance-based definitions. Thus, finding outliers in highdimensional data is more complex. In this paper, some basic outlier analysis algorithms arediscussed and a new genetic algorithm is presented. This algorithm is to find best dimensionprojections based on a revised cell-based algorithm and to give explanations to solutions. It cansolve the outlier detection problem for gene expression data and for other high dimensional data aswell.

关键词： gene expression data outlier analysis cell-based algorithm geneticalgorithm

Improved Twin Support Vector Machine Algorithm and Applications in Classification Problems

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China Communications 2024年第5期21卷 261-279页

作者： sun yi Wang Zhouyang Beijing University of Posts and Telecommunications School of Computer Science(National Pilot Software Engineering School) Beijing University of Posts and Telecommunications International School

The distribution of data has a significant impact on the results of *** the distribution of one class is insignificant compared to the distribution of another class,data imbalance *** will result in rising outlier values and ***,the speed and performance of classification could be greatly *** the above problems,this paper starts with the motivation and mathematical representing of classification,puts forward a new classification method based on the relationship between different classification *** with the vector characteristics of the actual problem and the choice of matrix characteristics,we firstly analyze the orderly regression to introduce slack variables to solve the constraint problem of the lone *** we introduce the fuzzy factors to solve the problem of the gap between the isolated points on the basis of the support vector *** introduce the cost control to solve the problem of sample ***,based on the bi-boundary support vector machine,a twostep weight setting twin classifier is *** can help to identify multitasks with feature-selected patterns without the need for additional optimizers,which solves the problem of large-scale classification that can’t deal effectively with the very low category distribution gap.

关键词： fuzzy ordered regression(OR) relaxing variables twin support vector machine

Strengthening and control of second-phase particle precipitation in ferritic/austenitic/martensitic heat-resistant alloys:a review

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Journal of Iron and Steel Research International 2024年第1期31卷 3-23页

作者： Xue-cheng Peng Han-jie guo Xin-fang Zhang yi-wa Luo Ye sun Jing guo Rong-guang Yang Xiao-dan Zheng School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials University of Science and Technology Beijing(USTB)Beijing100083China Beijing Shougang Gitane New MATERIALS Co. Ltd.Beijing102206China

Heat-resistant alloys with excellent mechanical properties are widely used in various fields,and further improvement in their properties is essential to meet the requirements in new-generation advanced supercritical boilers,nuclear reactors,superheaters,and other new materials *** effectively enhance the comprehensive performance of heat-resistant alloys,second-phase particle strengthening has been widely studied,and in the face of different service envi-ronments of advanced heat-resistant steels,the selection of suitable second-phase particles is essential to maximize the performance of these *** this end,three major types of reinforcing phases in heat-resistant alloys such as carbides,rare earth oxides,and intermetallic compounds are summarized.A comparative analysis of the precipitation behavior of the reinforcing phases with different types as well as the risks and means of controlling their use in service,is *** parameters for the application of various types of second-phase particles in heat-resistant alloys are provided to support the design and preparation of new ultrahigh-performance heat-resistant alloys.

关键词： Heat-resistant alloy Second-phase particle Carbide Rare earth oxide Intermetallic compound Strengthening

Optimal Dividend and Dynamic Reinsurance Strategies with Capital Injections and Proportional Costs

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Acta Mathematicae Applicatae Sinica 2012年第3期28卷 505-524页

作者： yi-dong WU Jun-yi guo School of Mathematical Sciences and LPMC Nankai UniversityTianjin 300071China School of Economics Yunnan UniversityKunming 650091China

We consider an optimization problem of an insurance company in the diffusion setting, which controls the dividends payout as well as the capital injections. To maximize the cumulative expected discounted dividends minus the penalized discounted capital injections until the ruin time, there is a possibility of （cheap or non-cheap） proportional reinsurance. We solve the control problems by constructing two categories of suboptimal models, one without capital injections and one with no bankruptcy by capital injection. Then we derive the explicit solutions for the value function and totally characterize the optimal strategies. Particularly, for cheap reinsurance, they axe the same as those in the model of no bankruptcy.

关键词： proportional reinsurance non-cheap optimal dividend capital injections

Revealing the interfacial electron modulation effect of CoFe alloys with CoC_(X) encapsulated in N-doped CNTs for superior oxygen reduction

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Advanced Powder Materials

Advanced Powder Materials 2022年第3期1卷 11-17页

作者： Jing sun Niankun guo Tianshan Song yi-Ru Hao Jiawen sun Hui Xue Qin Wang College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot010021PR China

Rationally designing and developing robust and durable electrocatalytic materials for oxygen reduction/evolution are essential for metal-air ***,an effective approach is proposed to fabricate high-performance electrocatalysts based on CoFe alloy and CoC_(X) nanoparticles sandwiched in nitrogen-doped carbon *** preparation of CoFe-CoC_(X)@NCNT is achieved by the calcination of CoFe_(2)O_(4) spinel and dicyandiamide under reducing *** CoFe-CoC_(X)@NCNT catalyst exhibits remarkable oxygen reduction reaction(ORR)performance with the onset and half-wave potential of 1.01 V and 0.89 V,respectively,exceeding the commercial Pt/C ***,the Zn-air battery using CoFe-CoC_(X)@NCNT as air cathode shows a power density of 175 mW cm-2,which is also higher than that of the industrial Pt/C t RuO_(2).The super electrocatalytic performance is attributed to the multiple heterointerface and strong coupling effect among CoFe,CoC_(X),and NCNT,which can regulate conductivity and electron structure of the *** study supplies a practical strategy to exploit active and low-cost catalytic material for Zn-air batteries,and presents an in-depth insight into the designing of efficient green energy storage devices.

关键词： Electronic structure Interfacial Synergistic effect Oxygen reduction Zinc-air battery

A parameter formula connecting PID and ADRC

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Science China(Information Sciences) 2020年第9期63卷 175-187页

作者： Sheng ZHONG yi HUANG Lei guo Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciences School of Mathematical Sciences University of Chinese Academy of Sciences

This paper presents a parameter formula connecting the well-known proportional-integralderivative(PID) control and the active disturbance rejection control(ADRC). On the one hand, this formula gives a quantitative lower bound to the bandwidth of the extended state observer(ESO) used in ADRC,implying that the ESO is not necessarily of high gain. On the other hand, enlightened by the design of ADRC, a new PID tuning rule is provided, which can guarantee both strong robustness and nice tracking performance of the closed-loop systems under the PID control. Moreover, it is proved that the ESO can be rewritten as a suitable linear combination of the three terms in PID, which can give a better estimate for the system uncertainty than the single integral term in the PID controller. Theoretical results are verified also by simulations in the paper.

关键词： nonlinear uncertain systems proportional-integral-derivative PID active disturbance rejection control ADRC extended state observer ESO

Protective effects of Jiayan Kangtai granules on autoimmune thyroiditis in a rat model by modulating Th17/Treg cell balance

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Journal of Traditional Chinese Medicine 2018年第3期38卷 380-390页

作者： Hou yi Wang Tieshan guo Xiangyu sun Wen guo Xuan Wu Lili Qin Lingling Zhang Chengfei Liu Tonghua Key Laboratory of Health Cultivation of the Ministry of Education Beijing University of Chinese Medicine Beijing 100029 China Dongfang Hospital of Beijing University of Chinese Medicine Beijing 100078 China Beijing Research Institute of Chinese Medicine & Beijing University of Chinese Medicine Beijing100029 China Department of Endocrinology Dongfang Hospital of Beijing University of Chinese Medicine Beijing100078 China Beijing Key Laboratory of Health Cultivation Beijing University of Chinese Medicine Beijing 100029China Science and Technology Department Beijing University of Chinese Medicine Beijing 100029 China

OBJECTIVE: To investigate the protective effects of Jiayan Kangtai(JYKT) granules, consisting of 9 Chinese herbs, in a rat model of autoimmune thyroiditis(AIT), and the possible underlying ***: Female Lewis rats(6-8 weeks) were randomly apportioned to 5 groups of 10, including a normal control. AIT was induced in the untreated AIT-model group, and rats treated subsequently with daily low, medium, or high dose JYKT granules. After 12 weeks, plasma levels of thyroid autoantibodies and morphological changes in the thyroid were detected by enzyme-linked immunosorbent assay and histological examination, respectively. The presence of interleukin(IL)-6,IL23 p19, and IL-2 in thyroid tissue was assessed by immunohistochemical staining. The percentages of T helper(Th)17 cells and regulatory T cells(Tregs) in the peripheral blood were analyzed by flow cytometry. Relevant levels of cytokines and proteins were examined via bead-based multiplex flow cytometry and ELISA, respectively. Expressions of genes and proteins regulated by Th17 cells and Tregs were shown by real-time PCR and Western ***: Compared to the control, AIT-model rats had higher plasma concentrations of thyroid autoantibodies. The high-dose JYKT rats showed significantly lower levels of thyroid autoantibodies compared with the AIT model group. Rats in the AIT-JYKT groups also had fewer thyroid lesions and less lymphocytic infiltration, a lower percentage of Th17 cells, and a higher percentage of Tregs, compared with the AIT-model. Rats given high-dose JYKT had a significantly lower Th17/Treg ratio compared with the AIT model. Differences in plasma cytokine concentrations and relevant gene and protein expressions in the spleens of JYKT-treated rats and the AIT group suggested an association between JYKT treatment and lower Th17 cell percentage and higher Treg ***: JYKT treatment appeared to be protective against AIT in rats, possibly via the regulation of the Th17 cell/Treg im

关键词： thyroiditis autoimmune Th17 cells T-Lymphocytes regulatory Herbal medicine Jiay-an Kangtai granules