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| 1 | Impact of Grid Connection of Large-Scale Wind Farms on Power System Small-Signal Angular Stability显示文摘The grid connection of a large-scale wind farm could change the load flow/configuration of a power system and introduce dynamic interactions with the synchronous generators(SGs),thus affecting system small-signal angular stability.This paper proposes an approach for the separate examination of the impact of those affecting factors,i.e.,the change of load flow/configuration and dynamic interactions brought about by the grid connection of the wind farm,on power system smallsignal angular stability.Both cases of grid connection of the wind farm,either displacing synchronous generators or being directly added into the power system,are considered.By using the proposed approach,how much the effect of the change of load flow/configuration brought about by the wind farm can be examined,while the degree of impact of the dynamic interaction of the wind farm with the SGs can be investigated separately.Thus,a clearer picture and better understanding of the power system small-signal angular stability as affected by grid connection of the large-scale wind farm can be achieved.An example of the power system with grid connection of a wind farm is presented to demonstrate the proposed approach. | Wenjuan Du Jingtian Bi Tong Wang Haifeng Wang | 2015 | CSEE Journal of Power and Energy Systems2015，1，2： | 39 |
| 2 | Immune secondary response and clonal selection inspired optimizers显示文摘The immune system's ability to adapt its B cells to new types of antigen is powered by processes known as clonal selection and affinity maturation. When the body is exposed to the same antigen,immune system usually calls for a more rapid and larger response to the antigen,where B cells have the function of negative adjustment. Based on the clonal selection theory and the dynamic process of immune response,two novel artificial immune system algorithms,secondary response clonal programming algorithm (SRCPA) and secondary response clonal multi-objective algorithm (SRCMOA),are presented for solving single and multi-objective optimization problems,respectively. Clonal selection operator (CSO) and secondary response operator (SRO) are the main operators of SRCPA and SRCMOA. Inspired by the clonal selection theory,CSO reproduces individuals and selects their improved maturated progenies after the affinity mat-uration process. SRO copies certain antibodies to a secondary pool,whose members do not participate in CSO,but these antibodies could be activated by some external stimulations. The update of the secondary pool pays more attention to maintain the population diversity. On the one hand,decimal-string representation makes SRCPA more suitable for solving high-dimensional function optimiza-tion problems. Special mutation and recombination methods are adopted in SRCPA to simulate the somatic mutation and receptor edit-ing process. Compared with some existing evolutionary algorithms,such as OGA/Q,IEA,IMCPA,BGA and AEA,SRCPA is shown to be able to solve complex optimization problems,such as high-dimensional function optimizations,with better performance. On the other hand,SRCMOA combines the Pareto-strength based fitness assignment strategy,CSO and SRO to solve multi-objective optimization problems. The performance comparison between SRCMOA,NSGA-Ⅱ,SPEA,and PAES based on eight well-known test problems shows that SRCMOA has better performance in converging to approximate Pareto-optimal fronts with wide distributions. | Maoguo Gong Licheng Jiao Lining Zhang Haifeng Du | 2009 | Progress in Natural Science:Materials International2009，19，2： | 24 |
| 3 | Optimal approximation of linear systems by artificial immune response显示文摘This paper puts forward a novel artificial immune response algorithm for op-timal approximation of linear systems. A quaternion model of artificial immune response is proposed for engineering computing. The model abstracts four elements, namely, antigen, antibody, reaction rules among antibodies, and driving algorithm describing how the rules are applied to antibodies, to simulate the process of immune response. Some reaction rules including clonal selection rules, immunological memory rules and immune regulation rules are introduced. Using the theorem of Markov chain, it is proofed that the new model is convergent. The experimental study on the optimal approximation of a stable linear system and an unstable one show that the approximate models searched by the new model have better performance indices than those obtained by some existing algorithms including the differential evolution algorithm and the multi-agent genetic algorithm. | GONG Maoguo DU Haifeng JIAO Licheng | 2006 | Science in China(Series F)2006，49，1： | 21 |
| 4 | Sub-synchronous Oscillations in Power Systems Caused by Grid-connected Wind Farms--A Survey of Mechanism Studies显示文摘Sub-synchronous oscillation(SSO)incidents caused by dynamic interaction between wind farms and power system grids can threaten safe and reliable operations.This paper investigates mechanism studies of SSOs in power systems induced by grid-connected wind farms.First,characteristics of several severe SSO incidents encountered by real power systems caused by grid-connected wind farms are introduced.Second,in terms of principles and responses,this paper illustrates the most commonly adopted mechanism investigation methods for SSOs,which include impedance-based analysis(IMA)and the openloop modal analysis(OMA)methods.Systematic reviews that summarize existing studies using the IMA and OMA methods are discussed in this paper.Furthermore,a discussion of the current research gaps in the investigation of SSOs in power systems caused by grid-connected wind farms is presented. | Chen Chen Wenjuan Du Haifeng Wang Tim Littler | 2018 | CSEE Journal of Power and Energy Systems2018，4，4： | 13 |
| 5 | Multiobjective optimization using an immunodominance and clonal selection inspired algorithm显示文摘Based on the mechanisms of immunodominance and clonal selection theory,we propose a new multiobjective optimization algorithm,immune dominance clonal multiobjective algorithm(IDCMA).IDCMA is unique in that its fitness values of current dominated individuals are assigned as the values of a custom distance measure,termed as Ab-Ab affinity,between the dominated individuals and one of the nondominated individuals found so far.According to the values of Ab-Ab affin-ity,all dominated individuals(antibodies) are divided into two kinds,subdominant antibodies and cryptic antibodies.Moreover,local search only applies to the sub-dominant antibodies,while the cryptic antibodies are redundant and have no func-tion during local search,but they can become subdominant(active) antibodies during the subsequent evolution.Furthermore,a new immune operation,clonal proliferation is provided to enhance local search.Using the clonal proliferation operation,IDCMA reproduces individuals and selects their improved maturated progenies after local search,so single individuals can exploit their surrounding space effectively and the newcomers yield a broader exploration of the search space.The performance comparison of IDCMA with MISA,NSGA-Ⅱ,SPEA,PAES,NSGA,VEGA,NPGA,and HLGA in solving six well-known multiobjective function optimization problems and nine multiobjective 0/1 knapsack problems shows that IDCMA has a good performance in converging to approximate Pareto-optimal fronts with a good distribution. | GONG MaoGuo JIAO LiCheng MA WenPing DU HaiFeng | 2008 | Science in China(Series F)2008，51，8： | 6 |
| 6 | Oxidation Behavior of C/C-SiC Gradient Matrix Composites显示文摘Oxidation behavior of C/C-SiC gradient matrix composites and C/C composites were compared in stationary air. The results show that oxidation threshold of C-SiC materials increases with the amount of SiC particles in the codeposition matrix. Oxidation rate of C/C-SiC gradient matrix composites is significantly lower than that of C/C material. The micro-oxidation process was observed by SEM. | Jingyi DENG, Wenchuan LIU, Haifeng DU, Huiming CHENG and Yiyi LI Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China | 2001 | Journal of Materials Science & Technology2001，17，5： | 6 |
| 7 | Clinical diagnosis and treatment of alpha-fetoprotein-negative small hepatic lesions显示文摘Objective: We examined 103 cases over the last five years and discussed diagnosis and treatment of alpha- fetoprotein (AFP)-negative small hepatic lesions. Background: Small hepatic lesions (less than 2 cm in diameter) usually have no typical imaging characteristics and therefore are difficult to diagnose, especially when AFP tests provide a negative result. Methods: A total of 103 patients with AFP-negative small hepatic lesions from January 2003 to December 2008 were retrospectively reviewed. Differential diagnosis was performed by digital subtraction angiography (DSA), dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI), contrast-enhanced ultrasound (CEUS), or positron emission tomography-computed tomography (PET-CT) based on the multiplicity of lesions. Ninety-four patients with suspected cancers underwent partial hepatectomy. Clinical data were collected from hospital records and follow-up questionnaires. Results: Hepatocellular carcinoma (HCC) diagnostic sensitivity of DSA, DCE-MRI, CEUS and PET-CT was 88.2%, 93.9%, 88.9% and 88.9%, respectively. The surgery-related complication rate was 6.4%. Prognosis was good, with 1- and 3-year survival rates of 98.8% and 76.1%, respectively. Conclusions: DSA, DCE-MRI, CEUS and PET-CT are valuable for diagnosis of small hepatic lesions. Partial hepatectomy is a preferred surgical procedure. Surgery for small liver cancers usually has little risk and good prognosis, therefore it can be actively applied in suspected HCC cases. | Yiyao Xu Xin Lu Yilei Mao Xinting Sang Haitao Zhao Shunda Du Haifeng Xu Yongliang Sun Huayu Yang Tianyi Chi Zhiying Yang Shouxian Zhong Jiefu Huang | 2013 | Chinese Journal of Cancer Research2013，25，4： | 6 |
| 8 | Adaptive chaos clonal evolutionary programming algorithm显示文摘Based on the chaos movement and the clonal selection theory, a novel artificial immune system algorithm, Adaptive Chaos Clonal Evolutionary Programming Algorithm (ACCEP), is proposed in this paper. The new algorithm uses the Logistic Sequence to control the mutation scale and uses the Chaos Mutation Operator to control the clonal selection. Compared with SGA and Clonal Selection Algorithm, ACCEP can enhance the precision and stability, avoid prematurity to some extent, and have the high convergence speed. The results of the experiment indicate that ACCEP has the capability to solve complex machine learning tasks, like Multimodal Function Optimization. | DU Haifeng GONG Maoguo LIU Ruochen JIAO Licheng | 2005 | Science in China(Series F)2005，48，5： | 5 |
| 9 | 2-D Stability Analysis for Bottleneck Networks with Active Queue Management ()显示文摘 | XIAO Yang DU Haifeng CAO Zhenzhen LEE Moon Ho | 2007 | Chinese Journal of Electronics2007，16，3： | 5 |
| 10 | Asymmetric Catalysis with Chiral Frustrated Lewis Pairs显示文摘The chemistry of frustrated Lewis pairs(FLPs)provides the most important approach for the metal-free hydrogenation and hydrosilylations.Great progress has been achieved in this area for the past decade.Some promising results have also been obtained.This perspective article mainly focuses on the recent advances for the synthesis of chiral Lewis acidic boranes in category of three protocols,1)hydroboration of chiral internal alkenes with Piers'borane HB(C6F5)2;2)in situ hydroboration of chiral alkenes or alkynes without any purification;3)and substitution reaction of(C6F5)nBCl3-n with chiral organometallic reagents,as well as their applications in the metal-free asymmetric hydrogenations and hydrosilylations. | Wei Meng Xiangqing Feng Haifeng Du | 2020 | Chinese Journal of Chemistry2020，38，6： | 5 |
| 11 | Applications of Localized Phase Compensation Method to Design a Stabilizer in a Multi-machine Power System显示文摘为了演示和验证稳定器设计的就地相位补偿法在多机电力系统中的应用,介绍在多机电力系统中,就地补偿设计稳定器的2个应用实例。第1个实例是在多机电力系统中就地补偿设计电力系统稳定器(power system stabilizer,PSS),阻尼电力系统局部模振荡。第2个实例是就地补偿设计附加在静态同步补偿器(static synchronous compensator,STATCOM)上的稳定器,抑制多机电力系统中的区域模振荡,并给出在一个16机电力系统中的应用计算和仿真结果。 | DU Wenjuan WANG Haifeng CAO Jun | 2012 | 中国电机工程学报2012，32，22： | 4 |
| 12 | Spatiotemporal pattern of urban forest leaf area index in response to rapid urbanization and urban greening显示文摘Rapid urbanization and urban greening have caused great changes to urban forests in China. Understanding spatiotemporal patterns of urban forest leaf area index(LAI) under rapid urbanization and urban greening is important for urban forest planning and management. We evaluated the potential for estimating urban forest LAI spatiotemporally by using Landsat TM imagery. We collected three scenes of Landsat TM(thematic mapper)images acquired in 1997, 2004 and 2010 and conducted a field survey to collect urban forest LAI. Finally, spatiotemporal maps of the urban forest LAI were created using a NDVI-based urban forest LAI predictive model.Our results show that normalized differential vegetation index(NDVI) could be used as a predictor for urban forest LAI similar to natural forests. Both rapid urbanization and urban greening contribute to the changing process of urban forest LAI. The urban forest has changed considerably from 1997 to 2010. Urban vegetated pixels decreased gradually from 1997 to 2010 due to intensive urbanization.Leaf area for the study area was 216.4, 145.2 and173.7 km^2 in the years 1997, 2004 and 2010, respectively.Urban forest LAI decreased sharply from 1997 to 2004 and increased slightly from 2004 to 2010 because of numerous greening policies. The urban forest LAI class distributions were skewed toward low values in 1997 and 2004. Moreover, the LAI presented a decreasing trend from suburban to downtown areas. We demonstrate the usefulness of TM remote-sensing in understanding spatiotemporal changing patterns of urban forest LAI under rapid urbanization and urban greening. | Zhibin Ren Yunxia Du Xingyuan He Ruiliang Pu Haifeng Zheng Haide Hu | 2018 | Journal of Forestry Research2018，29，3： | 4 |
| 13 | Simultaneous Curvature and Temperature Sensing Based on a Novel Mach-Zehnder Interferometer显示文摘A novel fiber inline Mach-Zehnder interferometer(MZI)is proposed for simultaneous measurement of curvature and temperature.The sensor composes of single mode-multimode-dispersion compensation-multimode-single mode fiber(MMF-DCF-MMF)structure,using the direct fusion technology.The experimental results show curvature sensitivities of−12.82 nm/m^(−1) and−14.42 nm/m^(−1) in the range of 0−0.65 m^(−1) for two resonant dips,as well as temperature sensitivities of 57.6 pm/and 74.3℃pm/within the range of 20℃℃−150.In addition,℃the sensor has unique advantages of easy fabrication,low cost,high fringe visibility of 24 dB,and high sensitivity,which shows a good application prospect in dual-parameters of sensing of curvature and temperature. | Xiaoyan SUN Haifeng DU Xinran DONG Youwang HU Ji’an DUAN | 2020 | Photonic Sensors2020，10，2： | 4 |
| 14 | Mechanical and tribological performance of CoCrNiHf_(x)eutectic medium-entropy alloys显示文摘The excellent properties of the multi-principal element alloys(e.g.,the CoCrNi medium-entropy alloy)make them a perfect candidate for structure materials.Their low strength and poor wear-resistance,however,limit considerably their applications.In this study,a lamellar eutectic microstructure was introduced by addition of Hf into CoCrNi alloy to produce a series of CoCrNiHf_(x)(x=0.1,0.2,0.3 and 0.4)eutectic medium-entropy alloys.A homogeneous eutectic microstructure with an alternate array of the soft FCC solid-solution phase and the hard Laves phase was identified for the as-cast CoCrNiHf_(0.3)alloy.After an investigation of the microstructure,mechanical and tribological properties,it was found that the hardness(plasticity)increases(decreases)with the increasing volume fraction of the Laves phase and the CoCrNiHf_(0.3)eutectic alloy exhibits both good plasticity and high strength.The wear behavior is strongly dependent on the applied normal load.For a low normal load,its tribological behavior follows the Archard's equation and a higher hardness due to Hf addition can resist plastic deformation and abrasive wear.When the normal load is high enough,the hypoeutectic or hypereutectic alloy,which possessing either high strength or good ductility but not at the same time,exhibit a poor wear resistance.In comparison,the full eutectic CoCrNiHf_(0.3)alloy with a superior combination of strength and toughness shows the best wear performance,as it can significantly reduce fracture during wear. | Yin Du Xuhui Pei Zhaowu Tang Fan Zhang Qing Zhou Haifeng Wang Weimin Liu | 2021 | Journal of Materials Science & Technology2021，，31： | 4 |
| 15 | Chiral Frustrated Lewis Pairs Catalyzed Highly Enantioselective Hydrosilylations of Ketones显示文摘A highly enantioselective Piers-type hydrosilylation of simple ketones was successfully realized using a chiral frustrated Lewis pair of tri-tert-butylphosphine and chiral diene-derived borane as catalyst.A wide range of optically active secondary alcohols were furnished in 80%-99% yields with 81%-97% ee's under mild reaction conditions. | Xiaoqin Liu Qiaotian Wang Caifang Han Xiangqing Feng Haifeng Du | 2019 | Chinese Journal of Chemistry2019，37，7： | 3 |
| 16 | Enhanced Photocatalytic Activity of Bi_(24)O_(31)Br_(10): Constructing Heterojunction with BiOI显示文摘Bismuth-based compounds have been regarded as an important class of visible-light photocatalysts due to their special electronic structures. In this paper, iodide ions are introduced to modify bismuth-based compound, Bi_(24)O_(31)Br_(10), forming a Bi_(24)O_(31)Br_(10)/BiOI heterojunction structure. A significant enhancement of photocatalytic activity compared to the parent compounds is observed in de-coloration of rhodamine B(Rh.B) solution. The improved photocatalytic property of Bi_(24)O_(31)Br_(10)/BiOI heterojunction is ascribed to the unique electronic structure consisting of complementary band structures of BiOI and Bi_(24)O_(31)Br_(10).Iodide ions are regarded as an effective reagent to construct bismuth-based photocatalytic heterojunctions with improved photocatalytic activity. | Xi Lou Jun Shang Liang Wang Haifeng Feng Weichang Hao Tianmin Wang Yi Du | 2017 | Journal of Materials Science & Technology2017，33，3： | 3 |
| 17 | Application of Scanning Tunneling Microscopy in Electrocatalysis and Electrochemistry显示文摘Scanning tunneling microscopy(STM)has gained increasing attention in the field of electrocatalysis due to its ability to reveal electrocatalyst surface structures down to the atomic level in either ultra-high-vacuum(UHV)or harsh electrochemical conditions.The detailed knowledge of surface structures,surface electronic structures,surface active sites as well as the interaction between surface adsorbates and electrocatalysts is highly beneficial in the study of electrocatalytic mechanisms and for the rational design of electrocatalysts.Based on this,this review will discuss the application of STM in the characterization of electrocatalyst surfaces and the investigation of electrochemical interfaces between electrocatalyst surfaces and reactants.Based on different operating conditions,UHV-STM and STM in electrochemical environments(EC-STM)are discussed separately.This review will also present emerging techniques including high-speed EC-STM,scanning noise microscopy and tip-enhanced Raman spectroscopy. | Haifeng Feng Xun Xu Yi Du Shi Xue Dou | 2021 | Electrochemical Energy Reviews2021，4，2： | 2 |
| 18 | Identification and characterization of phosphodiesterases that specifically degrade 3'3'-cyclic GMP-AMP显示文摘 | Juyi Gao Jianli Tao Weili Liang Meng Zhao Xiaoxia Du Shan Cui Haifeng Duan Biao Kan Xiaodong Su Zhengfan Jiang | 2015 | Cell Research2015，25，5： | 2 |
| 19 | Two-dimensional characterization of three-dimensional magnetic bubbles in Fe_(3)Sn_(2) nanostructures显示文摘We report differential phase contrast scanning transmission electron microscopy(TEM) of nanoscale magnetic objects in Kagome ferromagnet Fe_(3)Sn_(2) nanostructures. This technique can directly detect the deflection angle of a focused electron beam, thus allowing clear identification of the real magnetic structures of two magnetic objects including three-ring and complex arch-shaped vortices in Fe_(3)Sn_(2) by Lorentz-TEM imaging. Numerical calculations based on real material-specific parameters well reproduced the experimental results, showing that the magnetic objects can be attributed to integral magnetizations of two types of complex three-dimensional(3D) magnetic bubbles with depth-modulated spin twisting. Magnetic configurations obtained using the high-resolution TEM are generally considered as two-dimensional(2D)magnetic objects previously. Our results imply the importance of the integral magnetizations of underestimated 3D magnetic structures in 2D TEM magnetic characterizations. | Jin Tang Yaodong Wu Lingyao Kong Weiwei Wang Yutao Chen Yihao Wang Y.Soh Yimin Xiong Mingliang Tian Haifeng Du | 2021 | National Science Review2021，8，6： | 2 |
| 20 | Protection of 3'-methoxy-puerarin against focal brain ischemia and its association with c-fos expression显示文摘The present study established a rat model of focal brain ischemia by occlusion of the middle cerebral artery covered with FeCl3, and investigated the protective effect of 3'-methoxy-puerarin. Hippocampal and cortical c-fos gene expression was determined using in situ hybridization. Results showed that 3'-methoxy-puerarin reduced neurological deficit scores, cerebral infarcted zone and water content of brain tissues, dramatically increased the activity of catalase and glutathione peroxidase in the ischemia zone of the hippocampus, increased the activity of catalase in the cortex, decreased lipid peroxide and lactic acid contents in the hippocampus and cerebral cortex, and down-regulated c-fos gene expression in brain ischemic rats. Results demonstrated that 3'-methoxy-puerarin exhibited cerebroprotective effects against focal brain ischemia, which involved c-fos gene expression. | Sha Liu Yibing Zhang Guiyou Du Yong Zhao Haifeng Cui Chunyu Cao | 2011 | Neural Regeneration Research2011，6，27： | 2 |
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