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| 1 | Numerical and Experimental Investigation of High-efficiency Axial-flow Pump显示文摘The experimental investigation of axial-flow pump has been rapidly developed to meet the needs of South-to-North Water Diversion Project of China. Owing to the boundary conditions of hub, blade tip clearance, much of the physical phenomena and laws involved in this complex flow field can’t be fully determined. The flow characteristics of the high efficiency axial-flow pump have been simulated by RNG k –ε turbulence model and SIMPLEC arithmetic based on FLUENT software. Numerical results indicate that the data from the prediction show agreement with the experimental results, static pressure on pressure side of blades increases slightly at circumferential direction with radius increasing, and keep almost constant at the same radial while increasing gradually from inlet to exit on the suction side along flow direction at design conditions. The static pressure, total pressure and velocity at inlet, impeller outlet and vane outlet were measured by a five-hole probe, and a contrastive experiment was done to investigate the influence of hub leakage. The experimental results show that inlet flow is almost axial and the prerotation is very small at various conditions. The meridional velocity and circulation distribution are almost identical at impeller outlet at design conditions due to steady flow and high efficiency. The residual circulation exits at downstream of the guide vane, and the circumferential velocity component increases linearly from hub to tip at small flow rate conditions. Hub leakage in adjustable blades results in the decrease of the meridional velocity and circulation at blade exit near hub. The results of numerical simulation and experiments supply important flow structure information for the high-efficiency axial-flow pump. | SHI Weidong ZHANGDesheng GUAN Xingfan LENG Hongfei | 2010 | Chinese Journal of Mechanical Engineering2010，23，1： | 50 |
| 2 | Thermodynamic modeling and phase diagram prediction of salt lake brine systemsⅡ.Aqueous Li^(+)-Na^(+)-K^(+)-SO_(4)^(2-) and its subsystems显示文摘It is still a challenging task to accurately and temperature-continuously express the thermodynamic properties and phase equilibrium behaviors of the salt-lake brine with multi-component,multitemperature and high concentration.The essential subsystem of sulfate type brine,aqueous Li^(+)-Na^(+)-K^(+)-SO_(4)^(2-) and its subsystems across a temperature range from 250 K to 643 K are investigated with the improved comprehensive thermodynamic model.Liquid parameters(Δg_(IJ),Δh_(IJ),and ΔC_(p,IJ))associated with the contributions of Gibbs energy,enthalpy,and heat capacity to the binary interaction parameters,i.e.the temperature coefficients of eNRTL parameters formulated with a Gibbs Helmholtz expression,are determined via multi-objective optimization method.The solid constantsΔ_(f)G_(k)°^((298.15))andΔ_(f)H_(k)°^((298.15))of11 solid species occurred in the quaternary system are rebuilt from multi-temperature solubilities.The modeling results show the accurate representation of(1)solution properties and binary phase diagram at temperature ranges from eutectic points to 643 K;(2)isothermal phase diagrams for Li_(2)SO_(4)-Na_(2)SO_(4)-H_(2)O,Li_(2)SO_(4)-K_(2)SO_(4)-H_(2)O and Na_(2)SO_(4)-K_(2)SO_(4)-H_(2)O ternary systems.The predicted results of complete structure and polythermal phase diagram of ternary systems and the isothermal phase diagrams of quaternary system excellently match with the experimental data. | Huan Zhou Peng Wu Wenxuan Li Xingfan Wang Kuo Zhou Qing Hao | 2021 | Chinese Journal of Chemical Engineering2021，34，6： | 6 |
| 3 | Existence of periodic solutions for second-order Hamiltonian systems with asymptotically linear conditions显示文摘We consider a class of asymptotically linear nonautonomous second- order Hamiltonian systems.Using the Saddle Point Theorem,we obtain the existence result,which extends some previously known results. | Xingfan CHEN Fei GUO Peng LIU | 2018 | Frontiers of Mathematics in China2018，13，6： | 2 |
| 4 | Groundwater net discharge rates estimated from lake level change in Badain Jaran Desert, Northwest China显示文摘Over a hundred sizable lakes,some even larger than^1 km2,are distributed across the lowlands between megadunes in the southeastern Badain Jaran Desert(BJD),northwest China.With rather limited precipitation and hardly any surface runoff,these lakes are fed mainly by groundwater.However,the source of the groundwater and the groundwater discharge rates to these lakes are poorly understood.Water level and temperature of four representative lakes in the southeastern BJD were monitored continuously between 2013 and 2017.Water surface evaporation and rainfall in this area were also measured.Combining these acquired data,groundwater discharge rates were estimated using water balance models.The results show that the four lakes have similar recharge and discharge patterns,but at different average net groundwater discharge rates ranging from 1.79 to 3.09 mm d?1.The lake level variation mainly depends on groundwater discharge and lake surface evaporation.We found that diurnal lake level variation may be controlled by earth tide and atmospheric pressure change,and is five times greater than the evaporation.The desert precipitation and deep confined groundwater with high temperature were found also recharging the desert lakes.An Empirical Mode Decomposition(EMD)method was used to identify the lake level trend.All lake levels increased over the last four years,except one decreased in 2015 and 2016.The lake levels’increasing trend is synchronously similar with the precipitation in north China.This study analyzes annual and seasonal lake level variations,and also finds the diurnal water cycle between the groundwater and lake water for the first time. | Xingfan WANG Hui ZHAO Yongwei SHENG Jianwei GENG Keqi WANG Hongyu YANG | 2020 | Science China Earth Sciences2020，63，5： | 2 |
| 5 | 显示文摘 | Li Hexing Chen Xingfan Wang Minghui | 2002 | Applied Catalysis A2002，225，12： | 1 |
| 6 | Influence of cathodic current on composition, structure and properties of Al 2 O 3 coatings on aluminum alloy prepared by micro-arc oxidation process显示文摘 | Shigang Xin Lixin Song Ronggen Zhao Xingfan Hu | 2005 | Thin Solid Films2005，，1： | 1 |
| 7 | Selective hydrogenation of cinnarnaldehyde to cinnamyl alcohol over the Co-La-B/SiO2 amorphous catalyst and the promoting effect of La-dopant显示文摘 | Chen Xingfan Li Hexing Dai Weilin | 2003 | Applied CatalysisA: General2003，253，： | 1 |
| 8 | Liquid Phase Hydrogenation of furfural to furfuryl alcohol over Mo-doped Co-B amorphous alloy catalysts显示文摘 | Chen Xingfan Li Hexing Luo Hongshan | 2002 | Applied CatalysisA: General2002，233，： | 1 |
| 9 | NOTCH Pathway Blockade Depletes CD133‐Positive Glioblastoma Cells and Inhibits Growth of Tumor Neurospheres and Xenografts显示文摘 | XingFan LeilaKhaki Thant S.Zhu Mary E.Soules Caroline E.Talsma NaheedGul CherylKoh JiangyangZhang Yue‐MingLi JarekMaciaczyk GuidoNikkhah FrancescoDiMeco SaraPiccirillo Angelo L.Vescovi Charles G.Eberhart | 2010 | STEM CELLS2010，，1： | 1 |
| 10 | Liquid phase hydrogenation of furfural to furfuryl alcohol over Mo-doped Co-B amorphous alloy catalysts显示文摘 | Chen Xingfan Li Hexing Luo Hongshan | 2002 | Applied Catalysis A:General2002，233，12： | 1 |
| 11 | Alteration of gut microbiota in type 2 diabetes complicated with cholelithiasis patients显示文摘To the Editor:Type 2 diabetes(T2D)and cholelithiasis are both common diseases with a high,prevalence.In China,the,prevalence of T2D,is.0.90% and that offadult cholelithiasis is 6.83%. | Jiajia Chen Linlin Yan Xingfan Ma Ping Yuan Fan Zhao Zihan Han Jingshan Liu Wenbo Wang Donghai Zhou Hongyu Zhao Nan Feng Dandan Huang Shoukui Hu Jin Gui | 2022 | Chinese Medical Journal2022，135，17： | 1 |
| 12 | Clinical application of autologous chyle fat transplantation in the correction of sunken upper eyelid显示文摘Aim:We investigated the clinical application of autologous chyle fat in the correction of sunken upper eyelid.Methods:From November 2020 to October 2021,89 cases of correction with autologous chyle fat to sunken upper eyelid were performed(with or without other cosmetic procedures related to the eyes).An appropriate amount of fat was extracted from the superficial layer of the patient’s thigh and processed to chyle fat.About 0.5-2.8 mL of fat was injected under the orbicularis oculi muscle(roof-retro orbicularis oculi fat)or in the area where the orbital septal fat exists from the outer orbital margin of the upper eyelid.Results:In total,59 patients were followed up for 1-11 months after surgery.No infection,necrosis,vascular embolism,upper eyelid lumpiness,fat calcification,or liquefaction occurred in all patients,while seven cases showed inadequate correction.The depression basically disappeared,the shape was relatively full,the youthfulness was greatly improved,and the satisfaction of patients was high during the follow-up period.Conclusion:The correction with autologous chyle fat to sunken upper eyelid showed little trauma,short recovery periods,and satisfactory results,and it is worthy of being popularized and applied more widely. | Lin Qi Pu Wang Xingfan Chen | 2022 | Plastic and Aesthetic Research2022，9，1： | 1 |
| 13 | Classification the geographical origin of corn distillers dried grains with solubles by near infrared reflectance spectrosco- py combined with chemometries: a feasibility study显示文摘 | ZHOU Xingfan YANG Zengling HAUGHEY S A | 2015 | Food Chemistry2015，189，： | 1 |
| 14 | Liquid phase hydrogenation of furfural to furfuryl alcohol over Modoped Co-B amorphous alloy catalysts显示文摘 | XINGFAN CHEN HEXING LI HONGSHAN LUO | 2002 | Appl Catal A:General2002，233，： | 1 |
| 15 | Displacement Calibration of Optical Tweezers With Gravitational Acceleration显示文摘In recent years,levitated particles of optical traps in vacuum have shown the enormous potential for precision sensor development and new physics exploration.However,the accuracy of the sensor is still hampered by the uncertainty of the calibration factor relating the detected signal to the absolute displacement of the trapped particle.In this paper,we suggest and experimentally demonstrate a novel calibration method for optical tweezers based on free-falling particles in vacuum,where the gravitational acceleration is introduced as an absolute reference.Our work provides a calibration protocol with a great certainty and traceability,which is significant in improving the accuracy of precision sensing based on levitated optomechanical systems. | Jianyu YANG Nan LI Xunmin ZHU Ming CHEN Mian WU Xingfan CHEN Cheng LIU Jian ZHUANG Huizhu HU | 2023 | Photonic Sensors2023，13，4： | 0 |
| 16 | U-shaped microRNA expression pattern could be a new concept biomarker for environmental estrogen显示文摘 | Rui Duan Yun Lu Lingyan Hou Lina Du Lequn Sun Xingfan Tang | 2016 | Frontiers of Environmental Science & Engineering2016，10，6： | 0 |
| 17 | PtCo-based nanocatalyst for oxygen reduction reaction:Recent highlights on synthesis strategy and catalytic mechanism显示文摘Oxygen reduction reaction over Pt-based catalyst is one of the most significant cathode reactions in fuel cells.However,low reserves and high price of Pt have motivated researchers worldwide seeking enhanced utilization efficiency and durability by doping non-noble metals to form Pt-based alloy catalysts.Alloying Pt with Co has been recognized as one of the most effective approaches to achieve this goal.PtCo bimetal combination is one of the most promising candidates to synthesize highly efficient catalysts for oxygen reduction reaction(ORR)applications,owing to its relatively more suitable oxygen binding energy for four-electron transfer reactions.Recently,impressive strategies have been developed to fabricate more active and stable PtCo-based multimetallic alloys with tailorable size and morphology.This paper aims to summarize the most recent highlights on the study of the relationship between preparation strategies,morphologies,electroactivities of the PtCo-based catalyst at atomic level and further the relevant reaction mechanism.The challenges and opportunities on the further development of electrocatalysts for fuel cells are included to provide reference for the practical application. | Wenjuan Yan Puhua Sun Chen Luo Xingfan Xia Zhifei Liu Yuming Zhao Shuxia Zhang Liang Sun Feng Du | 2023 | Chinese Journal of Chemical Engineering2023，53，1： | 0 |
| 18 | Actual Sensing Sensitivity and SNR Measurement of Optical Tweezers Based on Coulomb Force Input显示文摘Sensing sensitivity is the key performance of optical tweezers.By adjusting the frequency and magnitude of an applied Coulomb force as an input of optical tweezers,we directly measured the sensitivity and signal-to-noise ratio(SNR)of a system and indirectly calculated the actual noise magnitude.Combined with an output filter,the relationship between the SNR and bandwidths was studied.We established the simulation model of a system using Simulink and simulated the relationship between the SNR and magnitude of the input forces and filter bandwidths.In addition,we built an experimental system to determine the relationship between the SNR and the magnitude of the input forces and filter bandwidths.The actual minimum detectable force was measured as 1.8275×10^(-17)N at a 1Hz bandwidth.The experimental results were correlated with the simulation and theoretical results,confirming the effectiveness of the proposed method and demonstrating the high sensitivity of vacuum optical tweezers as mechanical sensors.We proposed a novel method of calibration and measurement of system sensing parameters by applying an actual force that was more direct and precise than the theoretical calculation method that requires accurate fitting parameters,such as the particle radius and density.This method can be employed to analyze the system noise and phase characteristics to confirm and improve the real performance of the system. | Jiaojiao WANG Xingfan CHEN Shaochong ZHU Zhenhai FU Nan LI Huizhu HU | 2023 | Photonic Sensors2023，13，1： | 0 |
| 19 | An Improved Solov2 Based on Attention Mechanism and Weighted Loss Function for Electrical Equipment Instance Segmentation显示文摘The current existing problem of deep learning framework for the detection and segmentation of electrical equipment is dominantly related to low precision.Because of the reliable,safe and easy-to-operate technology provided by deep learning-based video surveillance for unmanned inspection of electrical equipment,this paper uses the bottleneck attention module(BAM)attention mechanism to improve the Solov2 model and proposes a new electrical equipment segmentation mode.Firstly,the BAM attention mechanism is integrated into the feature extraction network to adaptively learn the correlation between feature channels,thereby improving the expression ability of the feature map;secondly,the weighted sum of CrossEntropy Loss and Dice loss is designed as the mask loss to improve the segmentation accuracy and robustness of the model;finally,the non-maximal suppression(NMS)algorithm to better handle the overlap problem in instance segmentation.Experimental results show that the proposed method achieves an average segmentation accuracy of mAP of 80.4% on three types of electrical equipment datasets,including transformers,insulators and voltage transformers,which improve the detection accuracy by more than 5.7% compared with the original Solov2 model.The segmentation model proposed can provide a focusing technical means for the intelligent management of power systems. | Junpeng Wu Zhenpeng Liu Xingfan Jiang Xinguang Tao Ye Zhang | 2024 | Computers, Materials & Continua2024，78，1： | 0 |
| 20 | PREDICTION OF PUMP CHARACTERISTICS ACCORDING TO GEOMETRICAL PARAMETERS OF IMPELLER AND VOLUTE CASING显示文摘PREDICTIONOFPUMPCHARACTERISTICSACCORDINGTOGEOMETRICALPARAMETERSOFIMPELLERANDVOLUTECASINGPREDICTIONOFPUMPCHARACTERISTICSACCORD... | Wei Guangxin Guan Xingfan Guo Nailong Huang Daojian(Jiangsu University of Science and Technology) | 1995 | Chinese Journal of Mechanical Engineering1995，8，4： | 0 |
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