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| 1 | A Review of Modular Multilevel Converters显示文摘模块组合多电平变换器(modular multilevel converter,MMC)具有高度模块化、易于扩展、输出电压波形好等特点,尤其适用于中高压大功率系统应用。首先介绍MMC的电路拓扑和工作原理,总结MMC的主要技术特点;然后分别回顾MMC在脉冲调制、直流电压控制、预充电、环流、谐波、数学模型、主电路参数设计、故障保护等关键问题的最新研究进展,以及其在电力传动、电能质量问题治理领域的工程应用现状,在此基础上指出MMC今后亟待研究的关键问题。相关研究结果表明,MMC在电力系统中有广泛的应用前景,是未来中高压大功率系统,尤其是高压输电技术的重要发展方向。 | YANG Xiaofeng LIN Zhiqin ZHENG Trillion Q. YOU Xiaojie | 2013 | 中国电机工程学报2013，33，6： | 99 |
| 2 | The crustal structures of the central Longmenshan along and its margins as related to the seismotectonics of the 2008 Wenchuan Earthquake显示文摘In 2010,a 500-km-long wide-angle reflection/refraction seismic profile was completed,running northwest from the central Sichuan Basin.This profile orthogonally crosses the meizoseismal area of great Wenchuan earthquake of 12 May 2008,which occurred in the central part of the Longmenshan.The profile also passes through the northwestern Sichuan Plateau,along which a new deep seismic sounding observation system was set up that was much improved over previous datasets and enabled abundant observations to be recorded.Seismic wave phase records that reflect the structural characteristics of different tectonic blocks,especially the complicated phase features associated with the Wenchuan earthquake,were calculated and analyzed in detail.A 2D crustal P-wave velocity model for the orogenic belt in the central Longmenshan and its margins was determined,and crustal structure differences between the stable Sichuan Basin and the thickened northwestern Sichuan Plateau were characterized.Lithological variations within the upper and lower crust in the interior of the plateau,especially a great velocity decrease and plastic rheological properties associated with strong lithologic weakening in lower crust,were detected.From west to east in the lower crust beneath the orogenic belt lying between the Sichuan Basin and the northwestern Sichuan Plateau,a giant shovel-like upwelling is observed that dips gently in the lower part and at higher angles in the upper part;this is inferred to be related to the fault systems in the central Longmenshan.An upwelling in the upper-middle crust along the eastern margin of the orogenic belt is associated with steeply dipping thrusts that strongly uplift the upper crust and crystalline basement beneath a central fault system in the Longmenshan.The data,combined with an understanding of the regional tectonic stress field and previous geological results,enable a discussion of basin-and-range coupling,orogenic tectonics,the crustal fault system,and the seismogenic tectonic environment of the central Longmenshan along the eastern margin of the Qinghai-Tibet Plateau. | JIA ShiXu LIU BaoJin XU ZhaoFan LIU Zhi FENG ShaoYing ZHANG JianShi LIN JieYan TIAN XiaoFeng LIU QiaoXia GUO WenBin | 2014 | Science China Earth Sciences2014，57，4： | 26 |
| 3 | Emissions of polycyclic aromatic hydrocarbons from coking industries in China显示文摘这研究开始估计多不的芳香的烃的特征(哼) 从 coking 工业的排放,与在四典型焦炭植物进行的领域采样。为每选择植物,栈烟道气体样品在包括的进程期间是镇定的控告煤进炉(CC ) ,推焦炭(PC ) 和焦炭炉气体(CG ) 的燃烧。十六个个人在 US EPA 优先级表上哼被煤气的层析 / 团 spectrometry (GC/MS ) 分析。结果证明总数哼在烟道气体的集中从 45.776 ~ 414.874 g/m3 ,与为 CC (359.545 g/m3 ) 的最高的排放水平。集中哼在 CP1 (收费的邮票) 从 CC 过程射出从 CP3 和 CP4 (收费的顶) 是比那低的。Low-molecular-weight 哼(即,二 -- 到三戒指哼) 到总数的占优势的贡献者哼内容,和小睡, AcPy,流感, PhA,和蚂蚁被发现是最丰富的。为 CC (2.248 g/m3 ) 的全部的 BaPeq 集中比为 PC (1.838 g/m3 ) 的那些高, CG (1.082 g/m3 ) ,和 DbA 作为在从 coking 过程的排出物的 BaP 是到 carcinogenic 风险的一个重要贡献者。微粒哼比对总数的相应贡献哼的占了超过 20% 全部的 BaPeq 集中,它显著地高集体集中(5%) 。微粒并且气体哼当时,应该被考虑潜在的毒性风险哼污染在 coking 期间,过程被估计。吝啬的总数 -- 哼排放因素分别地是为 CC 和 PC 的 346.132 和 93.173 g/kg。 | Ling Mu Lin Peng Junji Cao Qiusheng He Fan Li Jianqiang Zhang Xiaofeng Liu Huiling Bai | 2013 | Particuology2013，11，1： | 17 |
| 4 | Geographical characteristics of China’s wetlands derived from remotely sensed data显示文摘In this paper, we report the first wetland mapping of the entire China using Landsat enhanced thematic mapper plus (ETM+) data. These data were obtained from the Global Land Cover Facility at the University of Maryland spanning from 1999 to 2002. A total of 597 scenes of Landsat images were georeferenced and mosaiced. Manual image interpretation of satellite images was aided with elevation data, soil data, land cover/land use data and Google Earth. The minimum mapping unit is 10 pixel × 10 pixel, equivalent to 9 ha. The aim of our first round of mapping was only targeted at the boundary delineation of any type of wetland except those wetlands that are under agricultural use (i.e., paddy fields), which has already been well mapped by others. Our interpretation results indicate that a total of 359478 km2 of wetlands are of non-agricultural use. Among our preliminarily mapped wetland, 339353 km2 are inland wetland, 2786 km2 are non-agricultural artificial wetland, and 17609 km2 are coastal wetland. Because low-tide is rarely captured in satellite images, an under-estimation of coastal wetland is inevitable. We conducted some statistics based on our mapped wetlands and compared them with those previously obtained from a number of sources including a land cover/land use map made with satellite images during the late 1990s and early 2000s, a marshland map developed in approximately the same period, survey data of coastal wetland in early 1980s, and area data for approximately 400 larger patches of marshland in China compiled in 1996. Because some inconsistencies exist in the guidelines of those different wetland surveys, difference in area is expected. Some further comparison indicates that the wetland distributions derived from the preliminary wetland map are reasonable and more objective than other sources. The mapping process also indicated that the method adopted by us was efficient and cost-effective. We also found that in order to ensure comparability of the wetland maps developed at different times, a set of standard guidelines on the wetland categories to be mapped, and the mapping methods to be used must be well conceived, developed and effectively employed. We carried out some initial geographical analysis on the distribution of wetlands. | NIU ZhenGuo GONG Peng CHENG Xiao GUO JianHong WANG Lin HUANG HuaBing SHEN ShaoQing WU YunZhao WANG XiaoFeng WANG XianWei YING Qing LIANG Lu ZHANG LiNa WANG Lei YAO Qian YANG ZhenZhong GUO ZiQi DAI YongJiu | 2009 | Science China Earth Sciences2009，52，6： | 15 |
| 5 | Laser performance of the SG-Ⅲ laser facility显示文摘SG-Ⅲ laser facility is now the largest laser driver for inertial confinement fusion research in China. The whole laser facility can deliver 180 kJ energy and 60 TW power ultraviolet laser onto target, with power balance better than 10%.We review the laser system and introduce the SG-Ⅲ laser performance here. | Wanguo Zheng Xiaofeng Wei Qihua Zhu Feng Jing Dongxia Hu Jingqin Su Kuixing Zheng Xiaodong Yuan Hai Zhou Wanjun Dai Wei Zhou Fang Wang Dangpeng Xu Xudong Xie Bin Feng Zhitao Peng Liangfu Guo Yuanbin Chen Xiongjun Zhang Lanqin Liu Donghui Lin Zhao Dang Yong Xiang Xuewei Deng | 2016 | High Power Laser Science and Engineering2016，4，3： | 13 |
| 6 | TALEN-based generation of a cynomolgus monkey disease model for human microcephaly显示文摘基因在非人类的首领编辑可以为在人探索病原学和遗传上基于的神经病学的混乱的治疗学的策略导致珍贵模型。然而,仔细在人模仿病理学、行为的赤字的神经病学的混乱的一个猴子模型成功地还没被产生了。Microcephalin 1 (MCPH1 ) 在人的大脑,和智力迟钝伴随的 MCPH1 变化原因头小畸型的进化被含有。这里,我们产生了用抄写带 biallelic MCPH1 变化的一只 cynomolgus 猴子(Macaca fascicularis ) 像使活跃之物的受动器核酸酶。猴子概括了大多数在病人观察的重要临床的特征,包括在头圆周,早熟的染色体冷凝作用(PCC ) ,语料库 callosum 的发育不全和上面的手足 spasticity 的显著减小。而且,在变异的真皮的成纤维细胞的 MCPH1 的 overexpression 救了 PCC 症候群。这个猴子模型可以帮助我们阐明在人的头小畸型并且更好的致病的 MCPH1 的角色在首领大脑尺寸的进化理解这蛋白质的功能。 | Qiong Ke Weiqiang Li Xingqiang Lai Hong Chen Lihua Huang Zhuang Kang Kai Li Jie Ren Xiaofeng Lin Haiqing Zheng Weijun Huang Yunhan Ma Dongdong Xu Zheng Chen Xinming Song Xinyi Lin Min Zhuang Tao Wang Fengfeng Zhuang Jianzhong Xi Frank Fuxiang Mao Huimin Xia Bruce T Lahn Qi Zhou Shihua Yang Andy Peng Xiang | 2016 | Cell Research2016，26，9： | 13 |
| 7 | Laser performance upgrade for precise ICF experiment in SG-Ⅲ laser facility显示文摘The SG-Ⅲlaser facility(SG-Ⅲ)is the largest laser driver for inertial confinement fusion(ICF)researches in China,which has 48 beamlines and can deliver 180 kJ ultraviolet laser energy in 3 ns.In order to meet the requirements of precise physics experiments,some new functionalities need to be added to SG-Ⅲand some intrinsic laser performances need upgrade.So at the end of SG-Ⅲ's engineering construction,the 2-year laser performance upgrade project started.This paper will introduce the newly added functionalities and the latest laser performance of SG-Ⅲ.With these function extensions and performance upgrade,SG-Ⅲis now fully prepared for precise ICF experiments and solidly paves the way towards fusion ignition. | Wanguo Zheng Xiaofeng Wei Qihua Zhu Feng Jing Dongxia Hu Xiaodong Yuan Wanjun Dai Wei Zhou Fang Wang Dangpeng Xu Xudong Xie Bin Feng Zhitao Peng Liangfu Guo Yuanbin Chen Xiongjun Zhang Lanqin Liu Donghui Lin Zhao Dang Yong Xiang Rui Zhang Fang Wang Huaiting Jia Xuewei Deng | 2017 | Matter and Radiation at Extremes2017，2，5： | 13 |
| 8 | THEORY AND APPLICATION OF WAVELET ANALYSIS INSTRUMENT LIBRARY显示文摘小浪分析上的某新理论和算法被建议,包括连续小浪变换(享特威) ,分离小浪变换(DWT ) ,小浪包裹变换(WPT ) ,小浪 denosing 和母亲小浪选择,等等。用基于部件的层次模式,为虚拟仪器(VI ) 的平台被构造,并且象数据采样,数据分析和数据那样的函数介绍等等被提供。随后,小浪分析图书馆被设计并且发展。图书馆由专家系统,富有经验的数据库,开发平台和丰富的小浪分析组成功能的模块,它一起机械工程的域里的工具将军和特殊小浪分析,精力来源,交通 andbiomedicine,等等。最后,小浪分析虚拟仪器图书馆被使用检测差错叫的引擎敲击。试验性的结果显示虚拟仪器图书馆高效地装的小浪分析解决象检测引擎敲击那样的设计问题。 | BO Lin QIN Shuren LIU Xiaofeng | 2006 | Chinese Journal of Mechanical Engineering2006，19，3： | 12 |
| 9 | Characteristics of strike-slip inversion structures of the Karatau fault and their petroleum geological significances in the South Turgay Basin,Kazakhstan显示文摘The Karatau fault is one of the important strike-slip faults in central Asia,and the South Turgay Basin is located towards its northern end.Detailed seismic interpretation indicated that the strikeslip tectonism of the Karatau fault weakened gradually from west to east in the South Turgay Basin.Typical flower structures developed on the section,and strike-slip faults showed an echelon pattern on planar view.The Karatau strike-slip fault affected the South Turgay Basin in two periods:(1) The South Turgay strike-slip pull-apart rift basin formed as a result of regional extensive stress in the Early-Middle Jurassic,characterized by the juxtaposition of horsts and grabens.The formation of horsts provided favorable reservoir spaces for later hydrocarbon accumulation,and different filling stages of grabens controlled different reservoir-forming factors in grabens.(2) Two stages of tectonic inversion occurred in the Late Jurassic and Late Cretaceous and played a crucial role in the final shape of the structure in the South Turgay Basin.The oil and gas migrated to form reservoirs and mainly concentrated in the horsts,graben slopes and in both sides of the strike-slip fault zone.In the case of the degree of accumulation of petroleum,the factor explaining why horsts are better than grabens is the strike-slip pull-apart of the South Turgay Basin,and the structure inversion of the South Turgay Basin explains why the west graben is better than the east one.Overall,the Karatau strike-slip fault played a very important role in the formation of the South Turgay Basin and its hydrocarbon accumulations. | Yin Wei Fan Zifei Zheng Junzhang Yin Jiquan Zhang Mingjun Sheng Xiaofeng Guo Jianjun Li Qiyan Lin yaping | 2012 | Petroleum Science2012，9，4： | 11 |
| 10 | A Novel Square-wave Pulse Rotation Modulation Strategy for Modular Multilevel Converters显示文摘悬浮直流电容电压的均衡问题是模块组合多电平变换器(modular multilevel converter,MMC)的关键问题之一。提出一种可实现MMC直流电容电压平衡的方波脉冲循环调制(square-wave pulse rotation modulation,SWPRM)策略,在保证合成的阶梯波输出波形不变的前提下,根据MMC的拓扑结构和工作原理,对传统方波脉冲列进行脉冲优化,并按照一定的次序和切换周期进行循环和判断反相调整,获得的循环方波脉冲列作为最终驱动脉冲用于实现对MMC的控制。实验结果表明,采用提出的方波脉冲循环调制策略无需任何电容电压控制措施,在较低开关频率下,实现了MMC各功率单元间有功能量的平均分配和直流电容电压的均衡。 | YANG Xiaofeng LIN Zhiqin ZHENG Trillion Q YOU Xiaojie | 2013 | 中国电机工程学报2013，33，9： | 9 |
| 11 | Development and validation of an ocean wave retrieval algorithm for VV-polarization Sentinel-1 SAR data显示文摘The purpose is to study the accuracy of ocean wave parameters retrieved from C-band VV-polarization Sentinel-1Synthetic Aperture Radar(SAR) images, including both significant wave height(SWH) and mean wave period(MWP), which are both calculated from a SAR-derived wave spectrum. The wind direction from in situ buoys is used and then the wind speed is retrieved by using a new C-band geophysical model function(GMF) model,denoted as C-SARMOD. Continuously, an algorithm parameterized first-guess spectra method(PFSM) is employed to retrieve the SWH and the MWP by using the SAR-derived wind speed. Forty–five VV-polarization Sentinel-1 SAR images are collected, which cover the in situ buoys around US coastal waters. A total of 52 subscenes are selected from those images. The retrieval results are compared with the measurements from in situ buoys. The comparison performs good for a wind retrieval, showing a 1.6 m/s standard deviation(STD) of the wind speed, while a 0.54 m STD of the SWH and a 2.14 s STD of the MWP are exhibited with an acceptable error.Additional 50 images taken in China's seas were also implemented by using the algorithm PFSM, showing a 0.67 m STD of the SWH and a 2.21 s STD of the MWP compared with European Centre for Medium-range Weather Forecasts(ECMWF) reanalysis grids wave data. The results indicate that the algorithm PFSM works for the wave retrieval from VV-polarization Sentinel-1 SAR image through SAR-derived wind speed by using the new GMF C-SARMOD. | LIN Bo SHAO Weizeng LI Xiaofeng LI Huan DU Xiaoqing JI Qiyan CAI Lina | 2017 | Acta Oceanologica Sinica2017，36，7： | 7 |
| 12 | HYBRID WAVELET PACKET-TEAGER ENERGY OPERATOR ANALYSIS AND ITS APPLICATION FOR GEARBOX FAULT DIAGNOSIS显示文摘把包基于小浪分解(WPD ) 算法和 Teager 精力操作员(TEO ) ,新奇齿轮框差错察觉和诊断方法被建议。在 WPD 和 TEO 调整的原则分别地被介绍以后,它的过程是 expatiated。preprocessed 信号与立方的花键功能被插入内推,然后在选择基础小浪上膨胀了。基于最小的熵标准组织它信号的小浪包部件,插入内推的信号能与将近不同的差错频率内容被分解成它的主导的部件。提取每个主导的部件的解调信息, TEO 被使用。建议方法的性能在从在一辆重卡车上装的齿轮框收集的颤动信号上借助于几测试被估计。混合 WPD-TEO 方法为检测并且诊断局部性的齿轮盒子差错有效、柔韧,这被证明。 | LIU Xiaofeng QIN Shuren BO Lin | 2007 | Chinese Journal of Mechanical Engineering2007，20，6： | 6 |
| 13 | Recent Development in X-Ray Imaging Technology:Future and Challenges显示文摘X-ray imaging is a low-cost,powerful technology that has been extensively used in medical diagnosis and industrial nondestructive inspection.The ability of X-rays to penetrate through the body presents great advances for noninvasive imaging of its internal structure.In particular,the technological importance of X-ray imaging has led to the rapid development of highperformance X-ray detectors and the associated imaging applications.Here,we present an overview of the recent development of X-ray imaging-related technologies since the discovery of X-rays in the 1890s and discuss the fundamental mechanism of diverse X-ray imaging instruments,as well as their advantages and disadvantages on X-ray imaging performance.We also highlight various applications of advanced X-ray imaging in a diversity of fields.We further discuss future research directions and challenges in developing advanced next-generation materials that are crucial to the fabrication of flexible,low-dose,highresolution X-ray imaging detectors. | Xiangyu Ou Xue Chen Xianning Xu Lili Xie Xiaofeng Chen Zhongzhu Hong Hua Bai Xiaowang Liu Qiushui Chen Lin Li Huanghao Yang | 2021 | Research2021，，1： | 5 |
| 14 | Numerical Investigation of an Oscillating Airfoil using Immersed Boundary Method显示文摘Based on the immersed boundary method,a numerical simulation for an oscillating airfoil is established and a preliminary analysis of the oscillating airfoil is presented with an emphasis on the physical understanding of fluid-structure interaction.In order to validate the method,two simulation cases:oscillating circular cylinder at low K-C number and two degrees of freedom oscillating cylinder are carried out first and the results are in good agreement with the previous researches.In the oscillating airfoil simulation,it is found that the reduced velocity U* is a very sensitive factor and especially U*~2.8 is the critical stable boundary in the present work.The method shows the predominance of time saving in computational process for such a complicated fluid-structure interaction problem. | Guohua Zhong Lin Du Xiaofeng Sun | 2011 | Journal of Thermal Science2011，20，5： | 5 |
| 15 | Qiguiyishen decoction reduced the accumulation of extracellular matrix in the kidneys of rats with adriamycin-induced nephropathy显示文摘OBJECTIVE: To investigate the effect of Qiguiyishen decoction(QGYS) on the severity of nephropathy.METHODS: Twenty-four rats were randomly divided into four groups(Ⅰ, Ⅱ, Ⅲ, Ⅳ) according to the random number table. Group Ⅰ as control group did not establish nephropathy model. Groups Ⅱ,Ⅲ, and Ⅳ were intravenously administered Adriamycin(7.5 mg/kg) through the tail vein to establish nephropathy model. QGYS was prepared with the extracts of Huangqi(Radix Astragali Mongolici),Danggui(Radix Angelicae Sinensis),Niuxi(RadixAchyran-this Bidentatae), and Chuanxiong(Rhizoma Chuanxiong).Group Ⅳ was administered QGYS (2mL·kg-1·d-1), group Ⅲ was administered benazepril(10 mL·kg-1·d-1), and group Ⅰ, Ⅱ was administered water(2mL·kg-1·d-1)once daily for eight weeks.RESULTS: QGYS reduced the excretion of urinary protein and N-acetyl-β-D-glucosaminidase and alleviated the accumulation of extracellular matrix(ECM) in renal tissue. Additionally, QGYS effectively regulated the levels of transforming growth factor,tissue inhibitor of matrix metalloproteinase, and matrixmetalloprote in asesin the kidney of the rats.CONCLUSION:QGYS may reduce the accumulation of ECM in the kidneys of rats with Adriamycin-induced nephropathy. | Minggang Wei Wei Sun Weiming He Li Ni Xiaofeng Cai Zongqi Cheng Kun Gao Fengling Li Lin Chen Xinping Zhang | 2014 | Journal of Traditional Chinese Medicine2014，34，3： | 4 |
| 16 | Vertical motions of tide gauge stations near the Bohai Sea and Yellow Sea显示文摘A modified Gauss-Markov model with weighted constraints was constructed by combining satellite altimeter and tide gauge records. Vertical motion rates of nine tide gauge stations around the Bohai Sea and Yellow Sea are estimated. This is the first time systematic estimates have been derived in this region. Downward trends were seen at the six tide gauge stations located at Tanggu, Longkou, Laohutan, Bayuquan, Xiaochangshan, and Yantai; with vertical motion rates of-1.82±0.50,-1.65±0.46,-0.88±0.42,-0.58±0.62,-0.13±0.43, and-0.01±0.43 mm/yr, respectively. Upward trends were seen at the three tide gauge stations located at Qinhuangdao, Huludao and Chengshantou; with vertical motion rates of 1.12±0.46, 0.55±0.49 and 0.26±0.44 mm/yr, respectively. There was significant subsidence in Tanggu and Longkou, and a rising trend in Qinhuangdao. According to our results, the rate of sea level rise calculated from these tide gauge records can be improved using a more accurate measurement of the land elevation accounting for lifting or subsidence. The model derived can be used to estimate vertical motions of tide gauge stations, and can be widely applied to revise the benchmark levels of tide gauges. | LIU ShouHua CHEN ChangLin LIU KeXiu MU Lin WANG Hui WU XinRong ZHANG JianLi DUAN XiaoFeng GAO Jia | 2015 | Science China Earth Sciences2015，58，12： | 4 |
| 17 | Study on the fragmentation of granite due to the impact of single particle and double particles显示文摘Particle Impact Drilling(PID)is a novel method to improve the rate of penetration(ROP).In order to further improve the performance of PID,an investigation into the effect of single and double particles:(1)diameter;(2)initial velocity;(3)distance;and(4)angle of incidence was undertaken to investigate their effects on broken volume and penetration depth into hard brittle rock.For this purpose,the laboratory experiment of single particle impact rock was employed.Meanwhile,based on the LS-DYNA,a new finite element(FE)simulation of the PID,including single and double particles impact rock,has been presented.The 3-dimensional(3D),aix-symmetric,dynamicexplicit,Lagrangian model has been considered in this simulation.And the Elastic and Holmquist Johnson Cook(HJC)material behaviors have been used for particles and rocks,respectively.The FE simulation results of single particle impacting rock are good agreement with experimental data.Furthermore,in this article the optimal impact parameters,including diameter,initial velocity,distance and the angle of incidence,are obtained in PID. | Yuchun Kuang Wei Lin Xiaofeng Xu Yonghui Liu Kaisong Wu | 2016 | Petroleum2016，2，3： | 4 |
| 18 | A versatile photodetector assisted by photovoltaic and bolometric effects显示文摘The advent of low-dimensional materials with peculiar structure and superb band properties provides a new canonical form for the development of photodetectors.However,the limited exploitation of basic properties makes it difficult for devices to stand out.Here,we demonstrate a hybrid heterostructure with ultrathin vanadium dioxide film and molybdenum ditelluride nanoflake.Vanadium dioxide is a classical semiconductor with a narrow bandgap,a high temperature coefficient of resistance,and phase transformation.Molybdenum ditelluride,a typical two-dimensional material,is often used to construct optoelectronic devices.The heterostructure can realize three different functional modes:(i)the p-n junction exhibits ultrasensitive detection(450 nm-2μm)with a dark current down to 0.2 pA and a response time of 17μs,(ii)the Schottky junction works stably under extreme conditions such as a high temperature of 400 K,and(iii)the bolometer shows ultrabroad spectrum detection exceeding 10μm.The flexible switching between the three modes makes the heterostructure a potential candidate for next-generation photodetectors from visible to longwave infrared radiation(LWIR).This type of photodetector combines versatile detection modes,shedding light on the hybrid application of novel and traditional materials,and is a prototype of advanced optoelectronic devices. | Wei Jiang Tan Zheng Binmin Wu Hanxue Jiao Xudong Wang Yan Chen Xiaoyu Zhang Meng Peng Hailu Wang Tie Lin Hong Shen Jun Ge Weida Hu Xiaofeng Xu Xiangjian Meng Junhao Chu Jianlu Wang | 2020 | Light(Science & Applications)2020，9，1： | 3 |
| 19 | IMPROVED METHOD FOR HILBERT INSTANTANEOUS FREQUENCY ESTIMATION显示文摘In the mechanical fault detection and diagnosis field,it is more and more important to analyze the instantaneous frequency (IF) character of complex vibration signal.The improved IF estimation method is put forward aiming at the shortage of traditional Hilbert transform.It is based on Hilbert transform in wavelet domain.With the help of relationship between the real part and the imaginary part obtained from the complex coefficient of continuous wavelet transform or the analyti- cal signal reconstructed in wavelet packet decomposition,the instantaneous phase function of the subcomponent is extracted.In order to improve the precise of IF estimated out,some means such as Linear regression,adaptive filtering,resampling are applied into the instantaneous phase obtained, then,the central differencing operator is used to get desired IF.Simulation results with synthetic and gearbox fault signals are included to illustrate the proposed method. | BO Lin LIU Xiaofeng QIN Shuren | 2007 | Chinese Journal of Mechanical Engineering2007，20，6： | 3 |
| 20 | Effect of Swirl Cup's Secondary Swirler on Flow Field and Ignition Performance显示文摘In a gas turbine engine combustor, highly swirling combustion is usually adopted to stabilize flame and reduce pollutant emissions. Swirl cup, as an air blast atomizer, is widely used to provide a uniform presentation of fuel droplets to the combustor dome. This paper investigated the effect of secondary swirler on the flow field downstream of the swirl cup using particle image velocimetry(PIV). Three swirl cups' non-reacting flow field were studied: case A, B and C with secondary swirler vane angle 53°, 60°and 68° respectively. Detailed mean and transient velocities and vorticity in the center plane were obtained. From the PIV results, a sharp contrast flow field was obtained for case A to other two cases due to the lower secondary swirling intensity. The recirculation zone is collapsed in disorder for the case A. Ignition tests of the three cups were completed in a single cup combustor. In general, the ignition performance increases with the increasing of the secondary swirling intensity. For case A, the ignition performance is very unstable and has much randomness and there is no clear lean ignition boundary can be generated. This work can further understand the swirl behavior and ignition mechanism. | WANG Xiaofeng LIN Yuzhen ZHANG Chi TIAN Xingpeng | 2015 | Journal of Thermal Science2015，24，5： | 3 |
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