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| 1 | Wave‑Shaped Piezoelectric Nanofber Membrane Nanogenerator for Acoustic Detection and Recognition显示文摘With the rapid development of internet of things and wearable electronics,how to conveniently power uncountable sensors remains a huge challenge.Energy harvesting strategy is suggested to collect and convert environmental energies into electrical energy.Thereinto,piezoelectric polymers are utilized as fexible harvesters to convert mechanical energy.The latter widely distributes in both our daily life and industrial environment.Intrinsic piezoelectric property further drives piezoelectric polymers to construct fexible self-powered strain sensors.However,relatively low piezoelectric performance restricts their application in detection and conversion of weak mechanical excitations.Herein,wave-shaped 3D piezoelectric device was fabricated by embossing electrospun polyvinylidene fuoride nanofbers.This 3D structured device presents better longitudinal and transverse piezoelectric performance than usual fat-type one.This wave-shaped piezoelectric device was developed for acoustic detection and recognition with a frequency resolution better than 0.1 Hz.This wave-shaped device was capable of frequency spectrum analyses of various sound sources from human and animals and well presents its potential for future wearable acoustic sensors and transducers. | Fan Xu Jiang Yang Ruizhi Dong Hanxiao Jiang Conghuan Wang Weilin Liu Zaixiu Jiang Xiaoqing Zhang Guodong Zhu | 2021 | Advanced Fiber Materials2021，3，6： | 2 |
| 2 | Upregnlated miR-130a increases drug resistance by regulating RUNX3 and Wnt signaling in cisplatin-treated HCC cell显示文摘 | Ning Xu Conghuan Shen Yi Luo | 2012 | Bioehem Biophys Res Commun2012，425，2： | 1 |
| 3 | Test on the dynamic response of the offshore wind turbine structure with the large-scale bucket foundation显示文摘 | Zhang Puyang Ding Hongyan Le Conghuan | | 0，，： | 1 |
| 4 | Optimal Skirt Spacing for Subsea Skirted Foundation Considering Floating Stability显示文摘A hydraulics model is built in Moses to find the optimal internal skirt spacing for the maximum floating stability of the skirted foundation. The results show that the increase in the internal skirts' number can help improve the floating stability of the skirted foundation. However, with the increase in the internal skirts' number, the improvement of floating stability becomes more and more weak. In this study, an optimal number of four are found for the internal skirt spacing. Moreover, to testify the feasibility of internal skirt spacing, a practical project is modeled, which indicates that the optimal internal skirt spacing can satisfy the requirements of towing. | Hongyan Ding Yan Zhu Puyang Zhang Conghuan Le | 2017 | Transactions of Tianjin University2017，23，5： | 1 |
| 5 | Installa- tion and removal records of field trials for two mooring dolphin platforms with three suction caissons 显示文摘 | Zhang Puyang Ding Hongyan Le Conghuan | 2013 | Journal of Waterway Port Coastal and Ocean Engineering ASCE2013，139，6： | 1 |
| 6 | Dynamic Response Analysis of a Floating Mooring System显示文摘An innovative floating mooring system with two or more independent floating mooring platforms in the middle and one rigid platform on each side is proposed for improving efficiency and safety in shallow water. For this new system, most of collision energy is absorbed through the displacement of floating platforms. In order to illustrate the validity of the system, a series of model tests were conducted at a scale of 1:40. The coupled motion characteristics of the floating mooring platforms were discussed under regular and irregular waves, and the influences of wave direction and other characteristics on dynamic response of the system were analyzed. The results show that the mooring system is safest at 0° of wave incident angle, whereas the most dangerous mooring state occurs at 90° of wave incident angle. Motion responses increase with the increase of wave height, but are not linearly related to changes in wave height. | LE Conghuan DING Hongyan ZHANG Puyang | 2014 | Journal of Ocean University of China2014，13，3： | 1 |
| 7 | Test on the dynamic response of the offshore wind turbine structure with the large-scale bucket foundation显示文摘 | Zhang Puyang Ding Hongyan Le Conghuan | 2012 | Procedia Environmental Sciences2012，12，： | 1 |
| 8 | Test on the dynamic response of the offshore wind turbine struc- ture with the large-scale bucket foundation 显示文摘 | Zhang Puyang Ding Hongyan Le Conghuan | 2012 | Procedia Environmental Sciences2012，12，： | 1 |
| 9 | Test on the dynamic response of the offshore wind turbine struc- ture with the large-scale bucket foundation 显示文摘 | Zhang Puyang Ding Hongyan Le Conghuan | 2012 | Procedia Environmental Sciences2012，12，： | 1 |
| 10 | Test on the dynamic response of the offshore wind turbine struc- ture with the large-scale bucket foundation 显示文摘 | Zhang Puyang Ding Hongyan Le Conghuan | 2012 | Procedia Environmental Sciences2012，12，： | 1 |
| 11 | Cisplatin-induced downregulation of miR-199a-5p increases drug resistance by activating autophagy in HCC cell显示文摘 | Ning Xu Jianjun Zhang Conghuan Shen Yi Luo Lei Xia Feng Xue Qiang Xia | 2012 | Biochemical and Biophysical Research Communications2012，，4： | 1 |
| 12 | Cisplatin-induced downregulation of miR-199a-5p increases drug resistance by activating autophagy in HCC cell显示文摘 | Ning Xu Jianjun Zhang Conghuan Shen Yi Luo Lei Xia Feng Xue Qiang Xia | 2012 | Biochemical and Biophysical Research Communications2012，，4： | 1 |
| 13 | Test on the dynamic response of the offshore wind turbine structure with the large-scale bucket foundation 显示文摘 | Zhang Puyang Ding Hongyan Le Conghuan | 2012 | Procedia Environmental Sciences2012，12，： | 1 |
| 14 | Penetration Tests of Multi-Bucket Foundation in Sand for Offshore Wind Turbines显示文摘Suction foundations are generally installed with negative pressures to overcome the resistance of soils and complete the penetration,but excessive negative pressures are also avoided to cause seepage damages.In this paper,the model test method was used to analyze the movement characteristics of multi-bucket foundations in the process of sinking in sand,and the common calculation methods of sinking resistances are verified.The critical negative pressure corresponding to the seepage failure of foundation was determined under the action of increasing negative pressure step by step and the characteristics of soil failure were studied.The calculation formula of critical suction in sand was verified in application,and according to the test results,the value of seepage coefficient was modified,which provides an example for the study of suction foundation in sand soils. | ZHANG Puyang QI Xin ZHANG Chao LE Conghuan DING Hongyan | 2023 | Journal of Ocean University of China2023，22，4： | 0 |
| 15 | Comparisons of Wave Force Model Effects on the Structural Responses and Fatigue Loads of a Semi-Submersible Floating Wind Turbine显示文摘The selection of wave force models will significantly impact the structural responses of floating wind turbines.In this study,comparisons of wave force model effects on the structural responses and fatigue loads of a semi-submersible floating wind turbine(SFWT)were conducted.Simulations were performed by employing the Morison equation(ME)with linear or second-order wave kinematics and potential flow theory(PFT)with first-or second-order wave forces.A comparison of regular waves,irregular waves,and coupled wind/waves analyses with the experimental data showed that many of the simulation results and experimental data are relatively consistent.However,notable discrepancies are found in the response amplitude operators for platform heave,tower base bending moment,and tension in mooring lines.PFT models give more satisfactory results of heave but more significant discrepan-cies in tower base bending moment than the ME models.In irregular wave analyses,low-frequency resonances were captured by PFT models with second-order difference-frequency terms,and high-frequency resonances were captured by the ME models or PFT models with second-order sum-frequency terms.These force models capture the response frequencies but do not reasonably predict the response amplitudes.The coupled wind/waves analyses showed more satisfactory results than the wave-only analyses.However,an important detail to note is that this satisfactory result is based on the overprediction of wind-induced responses. | HAN Yanqing LE Conghuan ZHANG Puyang XU Shengnan | 2024 | Journal of Ocean University of China2024，23，1： | 0 |
| 16 | Experimental Study on the Influencing Factors of Motion Responses on an Air-Floating Caisson with Multiple Compartments显示文摘The structure of an air-floating caisson is suitable for the major structure of caisson-type artificial islands.Thus,it has been rapidly developed and widely used in the exploration and development of oil and gas fields in shallow sea and intertidal zones.Air-floating transportation technology is one of the key technologies employed in this structure.In this paper,the factors influencing the dynamic response characteristics of air-floating caisson with multi-compartments(AFCMC)were studied using model tests.The length and the height of each air-floating structure in the model were 1.0 and 0.1 m,respectively.In addition,the 1:100 models with 6,8,and 10 compartments under regular waves were tested in the wave flume,respectively.In the experiments,the respective water depths were set at 0.2,0.3,and 0.4 m,and the corresponding drafts were 0.05,0.06,and 0.07 m.Results show that with the increase of draft,the heave natural period increased and the maximum amplitude of the heave motion decreased.Meanwhile,the pitch motion decreased at 6 and 8 compartments and increased at 10 compartments.As the water depth increased,the maximum amplitude and amplitude change of heave and pitch motions first increased and then decreased.However,several amplitudes close to the maximum amplitude appeared in the measured period at shallower water depth,thereby indicating the vertical movements of the structure enhanced under shallow water.The increase in the number of compartments reduced the vertical movements under 6.0 m draft,but it increased the vertical movements under 5.0 and 7.0 m draft.Thus,increasing the number of compartments has a limited capacity to improve the motion performance of the structure. | LIU Xianqing ZHANG Puyang ZHAO Mingjie DING Hongyan LE Conghuan LV Nan LUO Sheng | 2022 | Journal of Ocean University of China2022，21，1： | 0 |
| 17 | Online Power System Voltage Stability Index for LCC HVDC Using Local Measurements显示文摘This paper proposes an online power system voltage stability index(PVSI Online)that quantifies power system voltage stability in real time between an AC network and LCC HVDC using only local measurements.Previous methods relied on using telecommunications to inform a change in a predetermined AC network model.The proposed method uses local measurements of voltage and current from the HVDC using a newly developed,numerically robust technique called Moving Window Covariance to detect a change in the AC network in real time.These network parameters are fed to a newly devised index that accurately models and captures the dynamics of the interaction between an LCC HVDC and AC network.The index is used to quantify stability,but also to advise network operation.In an onset of instability due to network degradation,the proposed index can provide a power order value for the HVDC to restore stability.All as a self-contained module that can be implemented within a HVDC scheme. | David Li Conghuan Yang Ying Xue Xiao-Ping Zhang | 2023 | CSEE Journal of Power and Energy Systems2023，9，1： | 0 |
| 18 | Preliminary Design of a Submerged Support Structure for Floating Wind Turbines显示文摘Cost-effective floating wind turbines with efficient installations are highly desired in deep waters(>50 m).This paper presents a submerged floating offshore wind turbines(SFOWT)concept for intermediate water depths(50-200 m).The performance of SFOWTs can be improved through a judicious choice of configuration,pretension,and mooring line layout.Four SFOWTs with different configurations and a similar mass,named Cyl-4,Cub-4,Cyl-3,and Hex-3,were designed and analyzed.The responses of the four SFOWTs were predicted under operational condition and extreme condition.The results show that the four SFOWTs exhibited good performance under both conditions.The effect of platform configurations on power output was negligible under the operational condition.Under the extreme condition,among the four SFOWTs,the mean bending moments at the tower base were very close,while the maximum values differed by up to 21.5%,due to the configurations.The effect of wind-wave misalignment under the extreme condition was further analyzed.In general,the motion performances of the four-pontoon SFOWTs,Cyl-4 and Cub-4,were superior to those of the three-pontoon SFOWTs,Cyl-3 and Hex-3.Optimization studies of the mooring system were carried out on Cub-4 with different mooring line pretensions and four mooring layouts.The optimized Cub-4 could reduce the maximum motion responses in the surge,heave,and yaw by 97.7%,91.5%,and 98.7%,respectively. | LE Conghuan ZHANG Jian DING Hongyan ZHANG Puyang WANG Guilan | 2020 | Journal of Ocean University of China2020，19，6： | 0 |
| 19 | Penetration Resistance of Composite Bucket Foundation with Eccentric Load for Offshore Wind Turbines显示文摘The penetration of the composite bucket foundation(CBF)is crucial in its construction process.In actual projects,the foundation is inevitably subjected to eccentric load caused by towers and turbines,as well as wind,wave,and flow,during the one-step installation.Moreover,the eccentric load is bound to affect the penetration method and penetration resistance of the foundation.To examine the above-mentioned issues,the penetration resistance of CBF with eccentric load was calculated and analyzed based on model tests,and the seepage field of the CBF under eccentric load was analyzed using ABAQUS.The influence of different magnitudes of eccentric load and various offset strategies on penetration resistance was analyzed,and the theoretical and measured values were compared.The result indicated that the negative pressure of the offset room was found to be smaller than that of other rooms when the CBF penetrated the soil under eccentric load.The penetration resistance of CBF under eccentric load was larger than that without eccentricity,and the larger the eccentric load is,the greater the penetration resistance.The influence of different eccentric load offset strategies on penetration resistance was found to be negligible.The calculated penetration resistance under eccentric load was in good agreement with the measured value. | ZHANG Puyang QI Xin YAN Ruiyang XU Yunlong LE Conghuan DING Hongyan | 2022 | Journal of Ocean University of China2022，21，6： | 0 |
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