|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Noise reduction method for nonlinear signal based on maximum variance unfolding and its application to fault diagnosis显示文摘A new noise reduction method for nonlinear signal based on maximum variance unfolding(MVU)is proposed.The noisy sig- nal is firstly embedded into a high-dimensional phase space based on phase space reconstruction theory,and then the manifold learning algorithm MVU is used to perform nonlinear dimensionality reduction on the data of phase space in order to separate low-dimensional manifold representing the attractor from noise subspace.Finally,the noise-reduced signal is obtained through reconstructing the low-dimensional manifold.The simulation results of Lorenz system show that the proposed MVU-based noise reduction method outperforms the KPCA-based method and has the advantages of simple parameter estimation and low parameter sensitivity.The proposed method is applied to fault detection of a vibration signal from rotor-stator of aero engine with slight rubbing fault.The denoised results show that the slight rubbing features overwhelmed by noise can be effectively extracted by the proposed noise reduction method. | ZHANG Yun &LI BenWei Department of Airborne Vehicle Engineering,Naval Aeronautical Engineering Institute,Yantai 264001,China | 2010 | Science China(Technological Sciences)2010，53，8： | 3 |
| 2 | Analysis of the characteristics of offshore currents in the Changjiang(Yangtze River) estuarine waters based on buoy observations显示文摘A buoy of 10 m in diameter was used to record the current speed and direction in a vertical profile in the offshore area of the Changjiang(Yangtze River) Estuary(with an average water depth of 46.0 m) for one year.The results include:(1) the currents rotate clockwise and the current direction is consistent in a vertical profile without clear seasonal variations.(2) The horizontal current speeds are generally high,with a maximum of 128.5 cm/s occurring in summer and 105.5 cm/s appearing in winter commonly close to the surface.The average current speeds in the vertical profile fall in the same range(the differences are less than 8.0 cm/s),with the maximum of47.0 cm/s occurring in summer and 40.8 cm/s in winter.The average current speed during spring tides is twice that during neap tides(26.5 cm/s).(3) Significant differences of speeds are observed in the vertical profile.The maximum current speed occurs at either surface(spring and winter) or sub-surface(summer and autumn),with the minimum current speed appearing at the bottom.The maximum average current speed of all layers is 57.9cm/s,which occurs in the 18-m layer during summer.(4) The average speed of the residual currents ranges from7.5 cm/s to 11.3 cm/s,with the strongest occurring in spring and weakest in winter.The residual currents of all layers are eastward during spring and winter,whereas northeastward or northward during summer and autumn.(5) The currents in the offshore of Changjiang Estuary are impacted collectively by diluted Changjiang River discharge,the Taiwan Warm Current,monsoon and tides. | LI Peng SHI Benwei WANG Yaping QIN Weihua LI Yangang CHEN Jian | 2017 | Acta Oceanologica Sinica2017，36，4： | 2 |
| 3 | Holocene environmental change inferred from the loess–palaeosol sequences adjacent to the floodplain of the Yellow River, China显示文摘 | Chun Chang Huang Jiangli Pang Hongxia Su Shengli Li Benwei Ge | 2009 | Quaternary Science Reviews2009，，25： | 2 |
| 4 | Evolving strategies for marine enzyme engineering:recent advances on the molecular modification of alginate lyase显示文摘Alginate,an acidic polysaccharide,is formed byβ-D-mannuronate(M)andα-L-guluronate(G).As a type of polysaccharide lyase,alginate lyase can efficiently degrade alginate into alginate oligosaccharides,having potential applications in the food,medicine,and agriculture fields.However,the application of alginate lyase has been limited due to its low catalytic efficiency and poor temperature stability.In recent years,various structural features of alginate lyase have been determined,resulting in modification strategies that can increase the applicability of alginate lyase,making it important to summarize and discuss the current evidence.In this review,we summarized the structural features and catalytic mechanisms of alginate lyase.Molecular modification strategies,such as rational design,directed evolution,conserved domain recombination,and non-catalytic domain truncation,are also described in detail.Lastly,the application of alginate lyase is discussed.This comprehensive summary can inform future applications of alginate lyases. | Shengsheng Cao Qian Li Yinxiao Xu Tiancheng Tang Limin Ning Benwei Zhu | 2022 | Marine Life Science & Technology2022，4，1： | 2 |
| 5 | Study on salicin content correlation between taxilli herba and their willow host plants显示文摘 | Dong Lu Benwei Sn Yonghua Li | 2012 | Med Plants Res2012，6，12： | 1 |
| 6 | Supervised locally linear em- bedding projection (SLLEP) for machinery fault diag- nosis显示文摘 | Benwei Li Yun Zhang | 2011 | Mechanical Systems and Signal Processing2011，25，31： | 1 |
| 7 | Comparison of the graphic and moment methods for analyzing grainsize distributions:A case study for the Chinese inner continental shelf seas显示文摘Sediment grain-size distributions provide key information on sediment sources,transport,and deposition.The Folk and Ward graphic method and the Friedman moment method are generally used for rapid analysis of the qualitative and quantitative properties of sediment samples;whether the two methods yield the same results for any given sediment sample is not yet known.Little research attention has been paid to comparison of the descriptive terms used in both methods,although some work has been done on comparison of the numerical values.In the current study,sediment samples from six areas of the Chinese inner continental seas were investigated.The mean and sorting values obtained using the two methods are well correlated(0.821≤R^(2)≤0.998),but the skewness and kurtosis vary among study areas(0.035≤R^(2)≤0.816),which is consistent with previous studies where R^(2) is the coefficient of determination.The two methods yield significant differences for skewness(84.78%-98.04%of samples)and kurtosis(40.59%-67.29%of samples).The main reasons for these differences are variations in the grainsize distribution curves of the sediment samples and differences in the weighting applied to specified cumulative percentile values by the two methods.These results demonstrate that the differences between the two methods should be taken into account when analyzing sedimentary environments and studying historical data. | Gaocong Li Rihong Du Jieping Tang Zhiqiang Li Qiong Xia Benwei Shi Liang Zhou Yang Yang Wenxiang Zhang | 2022 | International Journal of Sediment Research2022，37，6： | 1 |
| 8 | Characterization of longshore currents in southern East China Sea during summer and autumn显示文摘Current characteristics and vertical variations during summer and autumn in the southern East China Sea were investigated by measuring current profile, tide, wind, and wave data for 90 d from July 28 to October 25, 2015. Our results are:(1) The current was mainly a(clockwise) rotating flow, displaying reciprocating flow characteristics,and vertically the current directions were the same throughout the vertical profile.(2) The horizontal current speed was strongest during August(summer) with an average speed of 51.8 cm/s. The average current speeds during spring tides were highest in August and weakest in September, with speeds of 59.9 and 42.8 cm/s,respectively.(3) Considerable differences exist in average current speeds in different layers and seasons. The highest average current speeds were found in the middle–upper layers in August and in the middle–lower layers in September and October.(4) The residual current speed was highest in August, when the speed was 12.5–47.1 cm/s,whereas the vertical average current speed was 34.3 cm/s. The depth-averaged residual current speeds in September and October were only 50% of that in August, and the residual current direction gradually rotated in a counter-clockwise direction from the lower to surface layers.(5) Typhoon waves had a significant influence on the currents, and even affected the middle and lower water layers at depths of >70.0 m. Our results showed that the currents are controlled by the dynamic interplay of the Taiwan Warm Current, incursion of the Kuroshio Current onto the continental shelf, and monsoonal changes. | Peng Li Benwei Shi Yangang Li Sijian Wang Xin Lv Yaping Wang Qing Tian | 2020 | Acta Oceanologica Sinica2020，39，3： | 1 |
| 9 | Supervised locally linear embedding projection (SLLEP) for machinery fault diagnosis显示文摘 | Benwei Li Yun Zhang | 2011 | Mechanical Systems and Signal Processing2011，，8： | 1 |
| 10 | Supervised Locally Linear Embedding Projection (SLLEP) for Machinery Fault Diagnosis显示文摘 | Li Benwei Zhang Yun | 2011 | Mechanical Systems and Sig- nal Processing2011，25，8： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员