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| 1 | Impact of climate factors on runoff in the Kaidu River watershed:path analysis of 50-year data显示文摘Runoff formation is a complex meteorological-hydrological process impacted by many factors,especially in the inland river basin.Based on the data of daily mean air temperature,precipitation and runoff during the period of 1958-2007 in the Kaidu River watershed,this paper analyzed the changes in air temperature,precipitation and runoff and revealed the direct and indirect impacts of daily air temperature and precipitation on daily runoff by path analysis.The results showed that mean temperature time series of the annual,summer and autumn had a significant fluctuant increase during the last 50 years(P < 0.05).Only winter precipitation increased significantly(P < 0.05) with a rate of 1.337 mm/10a.The annual and winter runoff depthes in the last 50 years significantly increased with the rates of 7.11 mm/10a and 1.85 mm/10a,respectively.The driving function of both daily temperature and precipitation on daily runoff in annual and seasonal levels is significant in the Kaidu River watershed by correlation analysis.The result of path analysis showed that the positive effect of daily air temperature on daily runoff depth is much higher than that of daily precipitation in annual,spring,autumn and winter,however,the trend is opposite in summer. | XueMei LI LanHai LI LingPeng GUO FeiYun ZHANG Suwannee ADSAVAKULCHAI Ming SHANG | 2011 | Journal of Arid Land2011，3，2： | 10 |
| 2 | MODIFIED LAPLACIAN EIGENMAP ETHOD FOR FAULT DIAGNOSIS显示文摘A novel method based on the improved Laplacian eigenmap algorithm for fault pattern classification is proposed.Via modifying the Laplacian eigenmap algorithm to replace Euclidean distance with kernel-based geometric distance in the neighbor graph construction,the method can preserve the consistency of local neighbor information and effectively extract the low-dimensional manifold features embedded in the high-dimensional nonlinear data sets.A nonlinear dimensionality reduction algorithm based on the improved Laplacian eigenmap is to directly learn high-dimensional fault signals and extract the intrinsic manifold features from them.The method greatly preserves the global geometry structure information embedded in the signals,and obviously improves the classification performance of fault pattern recognition.The experimental results on both simulation and engineering indicate the feasibility and effectiveness of the new method. | JIANG Quansheng JIA Minping HU Jianzhong XU Feiyun | 2008 | Chinese Journal of Mechanical Engineering2008，21，3： | 9 |
| 3 | Design of Reflective Concentrator Model with Application for Concentrator Photovoltaic System显示文摘The nonuniform irradiation in the standard photovoltaic(PV) cells causes their relatively high series resistance,which results in a considerably lowered efficiency of PV cells.Currently the concentrator of uniform irradiation designed for concentrator photovoltaic is rare in China and lack sufficient theoretical research.In this paper,a systematic research on the solar reflective concentrator is conducted.A novel structure for a solar reflective concentrator is designed with the application of a flat mirror matrix to concentrate the sunlight for concentrator photovoltaic(CPV) systems.Sunlight beams are focused through the reflection of the mirror array on the solar cell to generate electricity.The concentrator is capable of producing much more uniform sunlight with a certain concentration ratio.The design scheme includes laying out the flat mirrors,optimizing the optical pathway and the parameters of each mirror.The prototype of the CPV system was installed at Nanjing,China.In the configuration of the prototype,it is composed of 24 pieces parallelogram flat mirrors,which are arranged into a total reflective array of 5 rows and 5 columns.In comparison with the parabolic trough concentrator,the experimental measurements verify such design has high efficiency.The concentrator model of a flat mirror matrix and the proposed new design method will lay a solid foundation for designing the concentrator of uniform irradiation. | SU Zhongyuan ZHANG Yaoming JIA Minping SUN Liguo XU Feiyun WANG Jun | 2011 | Chinese Journal of Mechanical Engineering2011，24，6： | 8 |
| 4 | Sensitivity of runoff to climatic variability in the northern and southern slopes of the Middle Tianshan Mountains,China显示文摘Temperature and precipitation play an important role in the distribution of intra-annual runoff by influencing the timing and contribution of different water sources.In the northern and southern slopes of the Middle Tianshan Mountains in China,the water sources of rivers are similar;however,the proportion and dominance of water sources contributing to runoff are different.Using the Manas River watershed in the northern slope and the Kaidu River watershed in the southern slope of the Middle Tianshan Mountains as case studies,we investigated the changes in annual runoff under climate change.A modified hydrological model was used to simulate runoff in the Kaidu River and Manas River watersheds.The results indicated that runoff was sensitive to precipitation variation in the southern slope and to temperature variation in the northern slope of the Middle Tianshan Mountains.Variations in temperature and precipitation substantially influence annual and seasonal runoff.An increase in temperature did not influence the volume of spring runoff;but it resulted in earlier spring peaks with higher levels of peak flow.Damages caused by spring peak flow from both slopes of the Middle Tianshan Mountains should be given more attention in future studies. | ZHANG Feiyun BAI Lei LI Lanhai WANG Quan | 2016 | Journal of Arid Land2016，8，5： | 4 |
| 5 | Preparation and Characterization of Co_(3)O_(4)/Graphene/Cellulose Nanofiber Composite Films显示文摘Nanocellulose has served as an eye-catching nanomaterial for constructing advanced functional devices with renewability,light weight,flexibility,and environmental friendliness.In this study,Co_(3)O_(4)/graphene/cellulose nanofiber(CNF)flexible composite films,in which the CNF acted as a spacer for the graphene,were prepared via a facile and scalable vacuum filtration method.The effects of the CNF on the microstructure,hydrophilicity,thermal stability,tensile strength,surface resistance,and electrochemical performance of the Co_(3)O_(4)/graphene/CNF composite films were systematically investigated.The results showed that the synergistic interaction of the CNF and graphene substantially improved the overall properties of the Co_(3)O_(4)/graphene/CNF composite films,particularly their hydrophilicity and tensile strength.Meanwhile,Co_(3)O_(4)/graphene/CNF composite films with a CNF content of 4%appeared to have the optimal electrochemical performance,with an area specific capacitance of 56 mF/cm^(2) and prominent capacitance retention of 95.6%at a current density of 1 A/g after 1000 cycles.This work demonstrated that the prepared Co_(3)O_(4)/graphene/CNF flexible composite films have great application potential in the field of flexible energy storage devices. | Zejun Ding Tianying Chen Yiming Zhou Peng Zhu Feiyun Li Yanjun Tang | 2022 | Paper And Biomaterials2022，7，2： | 2 |
| 6 | Bispectrum Feature Extraction of Gearbox Faults Based on Nonnegative Tucker3 Decomposition with 3D Calculations显示文摘Nonnegative Tucker3 decomposition(NTD) has attracted lots of attentions for its good performance in 3D data array analysis. However, further research is still necessary to solve the problems of overfitting and slow convergence under the anharmonic vibration circumstance occurred in the field of mechanical fault diagnosis. To decompose a large-scale tensor and extract available bispectrum feature, a method of conjugating Choi-Williams kernel function with Gauss-Newton Cartesian product based on nonnegative Tucker3 decomposition(NTD_EDF) is investigated. The complexity of the proposed method is reduced from(nNlgn) in 3D spaces to 12 o(R1R2nlgn)in 1D vectors due to its low rank form of the Tucker-product convolution. Meanwhile, a simultaneously updating algorithm is given to overcome the overfitting, slow convergence and low efficiency existing in the conventional one-by-one updating algorithm. Furthermore, the technique of spectral phase analysis for quadratic coupling estimation is used to explain the feature spectrum extracted from the gearbox fault data by the proposed method in detail. The simulated and experimental results show that the sparser and more inerratic feature distribution of basis images can be obtained with core tensor by the NTD_EDF method compared with the one by the other methods in bispectrum feature extraction, and a legible fault expression can also be performed by power spectral density(PSD) function. Besides, the deviations of successive relative error(DSRE) of NTD_EDF achieves 81.66 dB against 15.17 dB by beta-divergences based on NTD(NTD_Beta) and the time-cost of NTD_EDF is only 129.3 s, which is far less than 1747.9 s by hierarchical alternative least square based on NTD(NTD_HALS). The NTD_EDF method proposed not only avoids the data overfitting and improves the computation efficiency but also can be used to extract more inerratic and sparser bispectrum features of the gearbox fault. | WANG Haijun XU Feiyun ZHAO Jun’ai JIA Minping HU Jianzhong HUANG Peng | 2013 | Chinese Journal of Mechanical Engineering2013，26，6： | 2 |
| 7 | General ex-pression for linear and nonlinear time series models显示文摘 | Huang Ren Xu Feiyun Chen Ruwen | 2009 | Frontiers of Mechanical Engineering in China2009，4，1： | 1 |
| 8 | Vibration model of rolling element bearings in arotor-bearing system for fault diagnosis显示文摘 | CONG Feiyun CHEN Jin DONG Guangming | 2013 | Journal ofSound and Vibration2013，332，8： | 1 |
| 9 | Using trifluoroacetic acid to pretreat lignocellulosic biomass显示文摘 | Dong Dexian Sun Jie Huang Feiyun | 2009 | biomass and bioenergy2009，，33： | 1 |
| 10 | General expressionfor linear and nonlinear time series models 显示文摘 | Huang Ren Xu Feiyun Chen Ruwen | 2009 | Fron-tiers of Mechanical Engineering in China2009，4，1： | 1 |
| 11 | Transvaginal uterine fibroids with la- paroscopic cystectomy compared the clinical effects 显示文摘 | Chen Huiping Yu Xiaoru Zheng Feiyun | 2011 | Chinese Medical Innova- tion2011，，9： | 1 |
| 12 | Degradation efficiency and mechanism of azo dye RR2 by a novelozone aerated internal micro-electrolysis filter显示文摘 | Zhang Xianbing Dong Wenyi Sun Feiyun | 2014 | Journal of Hazardous Materials2014，276，： | 1 |
| 13 | A study on the growth of Yb: YVO4 single crystal显示文摘 | Chen Jianzhong Guo Feiyun Zhuang Naifeng | 2002 | Journal of Crystal Growth2002，243，： | 1 |
| 14 | General expression for linear and nonlinear time series models显示文摘 | Huang Ren Xu Feiyun Chen Ruwen | 2009 | Frontiers of Mathematics in China2009，4，1： | 1 |
| 15 | Sparsenesscontrolled non-negative tensor factorization and its application in machinery fault diagnosis显示文摘 | Peng Sen Xu Feiyun Jia Minping | | 0，，： | 1 |
| 16 | Non-uniform norm constraint LMS algorithm for sparse system identification 显示文摘 | Wu Feiyun Tong Feng | 2013 | IEEE Communications Letters2013，17，2： | 1 |
| 17 | Growth and characterization of Tb3 Gas-x AlxO12 single crystal显示文摘 | ZHANG Wenjing GUO Feiyun CHEN Jianzhong | 2007 | Journal of Crystal Growth2007，306，： | 1 |
| 18 | Growth and characterization of Tb3Ga1-xA1xO12 single crystal 显示文摘 | Zhang Weijing Guo Feiyun Chen Jianzhong | 2007 | Joumal of Crystal Growth2007，，306： | 1 |
| 19 | Vi-bration model of rolling element bearings in a rotor-bearing system for fault diagnosis显示文摘 | Cong Feiyun Chen Jin Dong Guangming | 2013 | Journal ofSound and Vibration2013，332，8： | 1 |
| 20 | Research on the order selection of the autoregressive modelling for rolling bearing diagnosis显示文摘 | Cong Feiyun Chen Jing Dong Guangming | 2010 | Proceedings of the Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science2010，224，： | 1 |
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