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| 1 | Direction-of-arrival estimation for a uniform circular acoustic vector-sensor array mounted around a cylindrical baffle显示文摘This work investigates the direction-of-arrival(DOA) estimation for a uniform circular acoustic Vector-Sensor Array(UCAVSA) mounted around a cylindrical baffle.The total pressure field and the total particle velocity field near the surface of the cylindrical baffle are analyzed theoretically by applying the method of spatial Fourier transform.Then the so-called modal vector-sensor array signal processing algorithm,which is based on the decomposed wavefield representations,for the UCAVSA mounted around the cylindrical baffle is proposed.Simulation and experimental results show that the UCAVSA mounted around the cylindrical baffle has distinct advantages over the same manifold of traditional uniform circular pressure-sensor array(UCPSA).It is pointed out that the acoustic Vector-Sensor(AVS) could be used under the condition of the cylindrical baffle and that the UCAVSA mounted around the cylindrical baffle could also combine the anti-noise performance of the AVS with spatial resolution performance of array system by means of modal vector-sensor array signal processing algorithms. | YANG DeSen ZHU ZhongRui | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，12： | 3 |
| 2 | Near fields scattered by an underwater finite cylindrical baffle显示文摘In this work,acoustic vector characteristics of near fields scattered by an underwater finite cylindrical baffle are investigated theoretically and experimentally.The analytic expressions for the scattered pressure and particle velocity are derived using the elastic thin shell theory.Calculations are presented for the scattered near fields of the pressure,the particle velocity and the intensity.It is found that the pressure and the particle velocity fields near the surface of the cylindrical baffle are characterized by complex interference structure,particle velocity directions and the source bearings are not consistent.The phase difference between the pressure and the particle velocity is not zero and the intensity vector does not reflect the sound bearings.It can be noted that the distortions of the fields will make the original vector signal processing method based on the free space assumption be no longer applicable in the presence of the cylindrical baffle.These results can serve as a basis of the application for the acoustic vector sensor on board. | YANG DeSen ZHU ZhongRui | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，9： | 2 |
| 3 | Relationship between the stoichiometric characteristics and leaf functional traits of Castanopsis hystrix in different ages显示文摘Both the stoichiometric characteristics and leaf functional traits can reflect the adaptability of plants to changes in the external living environment.In particular,for varying aged forest plants,the study of stoichiometric characteristics and leaf functional traits can reflect the plant’s life history strategy and its resource investment and allocation methods.In this paper,the 1.5-year-old,5-year-old,15-year-old and 20-year-old Castanopsis hystrix were selected as the research objects to investigate the trends of stoichiometry and leaf functional traits,and their synergistic changes were verified.The results showed that with the increase of age,the stability of C.hystrix stoichiometry gradually increased,and the functional traits also tended to invest in security.However,there was no synergistic change between the two,which might be attributed to the different sensitivity of the C.hystrix leaf to the environment at the life history level of 1.5-year-old to 20-year-old. | Zhang Zhongrui Qi Ye Ding Xiaogang Yang Haiyan Wei Dan Zhang Geng Zhu Hangyong Chen Li | 2020 | 林业与环境科学2020，36，2： | 1 |
| 4 | Effects of the growing-maize canopy and irrigation characteristics on the ability to funnel sprinkler water显示文摘Stemflow is vital for supplying water,fertilizer,and other crop essentials during sprinkler irrigation.Exploring the spatial and temporal variations of crop stemflow and its influencing factors will be essential to preventing soil water and nutrient ion's migration to deeper layers,developing,and optimizing effective sprinkler irrigation schedules.Based on the two-year experimental data,we analyzed the variation patterns(stemflow amount,depth,rate,and funneling ratio)of maize stemflow during the growing season,and clarified its vertical distribution pattern.Meanwhile,effects of sprinkler irrigation and maize morphological parameters on stemflow were investigated.The results showed that stemflow increased gradually as maize plant grew.Specifically,stemflow was small at the pre-jointing stage and reached the maximum at the late filling stage.The upper canopy generated more stemflow than the lower canopy until the flare opening stage.After the tasseling stage,the middle canopy generated more stemflow than the other positions.Variation in canopy closure at different positions was the main factor contributing to the above difference.As sprinkler intensity increased,stemflow also increased.However,the effect of droplet size on stemflow was inconsistent.Specifically,when sprinkler intensity was less than or equal to 10 mm/h,stemflow was generated with increasing droplet size.In contrast,if sprinkler intensity was greater than or equal to 20 mm/h,stemflow tended to decreased with increasing droplet size.Compared with other morphological parameters,canopy closure significantly affected the generation of stemflow.Funneling ratio was not significantly affected by plant morphology.Based on the results of different sprinkler intensities,we developed stemflow depth versus canopy closure and stemflow rate versus canopy closure power function regression models with a high predictive accuracy.The research findings will contribute to the understanding of the processes of stemflow involving the hydro-geochemical cycle of agro-ecosystems and the implementation of cropland management practices. | ZHU Zhongrui ZHU Delan GE Maosheng LIU Changxin | 2022 | Journal of Arid Land2022，14，7： | 0 |
| 5 | MUSIC-based direction of arrival estimation methods with virtual source elimination for single vector sensor in isotropic ambient noise显示文摘In the scenario of isotropic ambient noise,the inequality between the noise powers of the pressure and velocity channels of a single acoustic vector sensor causes a virtual source for subspace-based methods,which seriously degrades the performance of the conventional multiple signal classification(MUSIC) method.In order to solve this problem,an increased-rank MUSIC method and a weighted-amplitude MUSIC method are presented.The increased-rank MUSIC method augments the dimension of the signal subspace to eliminate the effect of the virtual source.Among the increased-rank,weighted-amplitude,and conventional MUSIC methods,the increased-rank MUSIC method gains the highest estimation accuracy in the cases of one source.Moreover,its performance approaches to the the Cramer-Rao bound(CRB).However,it fails in the case of two sources.The weighted-amplitude MUSIC method weights the amplitude of the received signal to eliminate the virtual source and it can identify two sources. | LIU Aifei YANG Deseng SHI Shengguo ZHU Zhongrui | 2019 | Chinese Journal of Acoustics2019，38，4： | 0 |
| 6 | Assessment of Forest Soil Fertility in Yunfu City based on Grey Correlation显示文摘Due to the spatial heterogeneity of forest soil,it is a difficult problem to evaluate the forest soil fertility on a large scale.This study conducted a grid survey of forest soil in Yunfu City,Guangdong Province,and used the the gray correlation system to evaluate forest soil fertility in each county.The results showed that the effect of using the gray correlation analysis to evaluate soil fertility in Yunfu city was ideal,and the fertilizer strength in each county was in order of Yunan,Yun'an,Yuncheng,Xinxing,and Luoding.The results can provide an appropriate scientific basis for forestry division within the county scale. | Zhang Zhongrui Qi Ye Ding Xiaogang Yang Haiyan Wei Dan Zhang Geng Zhu Hangyong Chen Li | 2019 | 林业与环境科学2019，35，6： | 0 |
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