|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Experimental research on oil fi lm thickness and its microwave scattering during emulsifi cation显示文摘Synthetic Aperture Radar(SAR) plays a major role in identifying oil spills on the sea surface.However,obtaining information of oil spill thickness(volume) is still a challenge.Emulsification is an important process affecting the thickness and normalized radar cross section(NRCS) of oil film.Experiments of crude oil emulsification with C-band fully-polarized scatterometer were conducted combining airborne hyperspectral imaging spectrometer and 3 D laser scanner observation data,to provide experimental parameters and method to support accurate remote sensing monitoring on marine oil spill.It is further proved that through quantitative homogeneous emulsified oil spill experiments,to a certain extent,the NRCS of oil film increased during the emulsification process of crude oil.The backscattering mechanism of crude oil emulsification was explored using a semi-empirical model(SEM);the change of oil film NRCS was modulated by its dielectric constant and surface roughness,in which the dielectric constant showed a dominant effect.The relationship between thickness and NRCS of oil film was studied under two experimental conditions.The differences of NRCS between oil film and adjacent seawater(Δσ~0) and the damping ratio(DR) were found to have a linear relationship with oil thickness,which were best in the vertical polarization mode(VV) at 45° incident angle during the quantitative crude oil homogeneous emulsification process.In the natural emulsification process of continuous oil spill in which oil film was mixed with both crude oil and emulsified oil,an empirical equation of oil film thickness is preliminarily established.The Δσ~0,DR,and the empirical equation of oil film thickness were applied to the marine continuous oil spill incident on a 19-3 oil platform with spaceborne SAR image and successfully explained the distribution of the relative thickness of the oil film. | Jie GUO Chenqi XU Genwang LIU Xi ZHANG Junmin MENG Guangbo REN | 2022 | Journal of Oceanology and Limnology2022，40，4： | 2 |
| 2 | Impact of emulsification of crude oil on normalized radar cross section显示文摘The emulsification of crude oil is caused by the oil flowing into the water,resulting in the increase of oil film tension,viscosity,water content,and volume,which brings great harm to the marine ecological environment and difficulties for the cleanup of marine emergency equipment.The realization observation of emulsification crude oil will increase the response speed of marine emergency response.Therefore,we set up crude oil emulsification samples to study the physical property in laboratory and conducted radar measurements at different incidence angles in outdoor.The radar is C band in resolution of 0.7 m by 0.7 m.A fully polarimetric scatterometer(HH,VV,and VH/HV)is mounted at 1.66 m(minimum altitude)height at an incidence angle between 35°and 60°.An asphalt content of less than 3%crude oil and the filtered seawater were used to the outdoor emulsification scattering experiment.The measurement results are as follows.The water content can be used to describe the process of emulsification and it is easy to measure.Wind speed,asphalt content,seawater temperature,and photo-oxidation affect the emulsifying process of crude oil,and affects the normalized radar cross section(NRCS)of oil film but wind is not the dominant factor.It is the first time to find that the emulsification of crude oil results in an increase of NRCS. | GUO Jie ZHANG Tianlong ZHANG Xi LIU Genwang | 2020 | Journal of Oceanology and Limnology2020，38，1： | 1 |
| 3 | Experimental study of C-band microwave scattering characteristics during the emulsification process of oil spills显示文摘In this study,oil spill experiments were performed in a water tank to determine changes in the surface scattering characteristics during the emulsification of oil spills.A C-band fully-polarimetric microwave scatterometer and a vector network analyzer were used to observe films of the following oils:crude oil with an asphalt content below3%that is prone to emulsification(type A),fresh crude oil extracted from an oilfield(type B),and industrial crude oil that was dehydrated and purified(type C).The difference in the backscatter results between the emulsified oil film and the calm water surface under C-band microwaves and the influence of the emulsification of the oil film on the backscatter were analyzed in detail.The results demonstrate that under a low-wind and no-waves condition(the maximum wave height was below than 3 mm),the emulsification of crude oil could modulated the backscatter through changes in the surface roughness and the dielectric constant,where the surface roughness had the dominant effect.The surface backscatters of the type B oil were greater than that of the type C oil in both the emulsified and non-emulsified states.In the non-emulsified state,the average differences in the backscatter between the type B and C oils were 2.19 dB,2.63 dB,and 2.21 dB for the polarization modes of VV,HH,and HV/VH,respectively.Smaller corresponding average differences of 0.98 dB,1.49 dB,and 1.5 dB were found for the emulsified state with a 20%moisture constant for the oil film.The results demonstrated that the surface roughness of the different oil films could vary due to the differences in the oil compositions and the oil film properties,which in turn affect the backscatter of the oil film surface. | Sijing Shu Junmin Meng Xi Zhang Jie Guo Genwang Liu | 2020 | Acta Oceanologica Sinica2020，39，7： | 0 |
| 4 | Polaron interfacial entropy as a route to high ther moelectric perfor mance in DAE-doped PEDOT:PSS films显示文摘Enhancing the thermoelectric transport properties of conductive polymer materials has been a long-term challenge,in spite of the success seen with molecular doping strategies.However,the strong coupling between the thermopower and the electrical conductivity limits thermoelectric performance.Here,we use polaron interfacial occupied entropy engineering to break through this intercoupling for a PEDOT:PSS(poly(3,4-ethylenedioxythiophene)-poly(4-styrenesulfonate))thin film by using photochromic diarylethene(DAE)dopants coupled with UV-light modulation.With a 10-fold enhancement of the thermopower from 13.5μV K^(-1) to 135.4μV K^(-1) and almost unchanged electrical conductivity,the DAE-doped PEDOT:PSS thin film achieved an extremely high power factor of 521.28μW m^(-1) K^(-2) from an original value of 6.78μW m^(-1) K^(-2).The thermopower was positively correlated with the UV-light intensity but decreased with increasing temperature,indicating resonant coupling between the planar closed DAE molecule and PEDOT.Both the experiments and theoretical calculations consistently confirmed the formation of an interface state due to this resonant coupling.Interfacial entropy engineering of polarons could play a critical role in enhancing the thermoelectric performance of the organic film. | Jiajia Zhang Caichao Ye Genwang Wei Liang Guo Yuhang Cai Zhi Li Xinzhi Wu Fangyi Sun Qikai Li Yupeng Wang Huan Li Yuchen Li Shuaihua Wang Wei Xu Xuefeng Guo Wenqing Zhang Weishu Liu | 2024 | National Science Review2024，11，3： | 0 |
| 5 | Enhanced electrochemical oxidation of perfluorooctanoic acid on Ti/SnO_(2)-Sb electrode by surface morphology regulation显示文摘Electrochemical oxidation is an effective method to degrade persistent organic pollutants.However,due to the limited catalytic activity of traditional thin film electrodes,the anodic oxidation process is slow and usually requires high energy consumption.Herein,Ti/SnO_(2)-Sb electrode with regulated surface structure was reported to enhance the performance for electrochemical oxidation of persistent organic pollutants.The electrode deposited with SnO_(2)-Sb nanoneedles(Ti/N-SnO_(2)-Sb)showed higher oxidation activity.Its kinetic constant for perfluorooctanoic acid(PFOA)oxidation was 2.0 h^(-1)and the total organic carbon removal rate was 81.7%(4 h)at a relatively low current density of 6 mA/cm^2.Compared with Ti/SnO_(2)-Sb thin film and nanoparticles,Ti/N-SnO_(2)-Sb significantly improved the electrochemical active area and·OH yield,and simultaneously reduced the electron transfer resistance,which enabled it to oxidize PFOA more rapidly even at a lower potential.This work provides a new strategy for promoting the electrochemical oxidation performance. | Kaiqiang Hou Genwang Zhu Yujie Feng Yanming Liu Xie Quan | 2024 | Chinese Chemical Letters2024，35，3： | 0 |
| 6 | A parameter inversion for sea bridge based on high-resolution polarimetric synthetic aperture radar显示文摘Each reflection return of a bridge over water is displayed as wide stripe in a high-resolution synthetic aperture radar(SAR) image,which lead to difficulties in a parameter inversion.Therefore,a method of bridge parameter inversion is proposed for high-resolution full polarimetric SAR(Pol SAR).First,the single,double and triplebounce returns from each component of the bridge are distinguished by the polarization scattering features.Then the reasons which lead to the backscatter echoes of the bridge over water being displayed as stripes are analyzed,using a principle of microwave reflection,as well as an extraction method for each reflection return,and a parameter retrieval method is obtained.Finally,the parameters of the bridge,including the height(top and bottom surfaces of the sea bridge),width,thickness,span,and height of the bridge tower,are retrieved using full polarimetric AIRSAR data.When a comparison of the measured data is completed,the results indicate that the proposed method can invert the parameters with a high accuracy,and that the inversion error of the bridge height(bottom surface) is only 1.3%.Moreover,the results also show that for the high-resolution SAR,the C and L-band images have the same ability in regards to parameter retrieval. | LIU Genwang ZHANG Jie ZHANG Xi MENG Junmin WANG Guoyu | 2016 | Acta Oceanologica Sinica2016，35，7： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员