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Vegetation scattering attenuation characteristics of terahertz wave
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作者 JING Qingfeng DIAO Zhuo ZHU Zhongbo 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2023年第6期1501-1507,共7页
A terahertz(THz)wave transmitted through vegetation experiences both absorption and scattering caused by the air molecules and leaves.This paper presents the scattering attenuation characteristics of vegetation in a T... A terahertz(THz)wave transmitted through vegetation experiences both absorption and scattering caused by the air molecules and leaves.This paper presents the scattering attenuation characteristics of vegetation in a THz range.The theoretical path loss model near the vegetation yields the average attenuation of THz waves in a mixed channel composed of air and vegetation leaves.Furthermore,a simplified model of the vegetation structure is obtained for generic vegetation types based on a variety of parameters,such as leaf size,distribution,and moisture content.Finally,based on specific vegetation species and different levels of air humidity,the attenuation characteristics under different conditions are calculated,and the influence of different model parameters on the attenuation characteristics is obtained. 展开更多
关键词 terahertz(THz) scatter attenuation VEGETATION vegetation structure model
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Scattering of scalar light wave from a Gaussian—Schell model medium 被引量:1
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作者 王涛 赵道木 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第8期391-394,共4页
The scattering of scalar light wave from a random medium with a correlation function of Gaussian-Schell model distribution is studied. It is shown that the properties of the scattered field, i.e., the spectral density... The scattering of scalar light wave from a random medium with a correlation function of Gaussian-Schell model distribution is studied. It is shown that the properties of the scattered field, i.e., the spectral density and the spectral degree of coherence of the scattered field, are closely related to the properties of the scattering medium, including the scaled effective radius and the scaled correlation length of the correlation function. 展开更多
关键词 scattering Gaussian-Schell model medium spectral density COHERENCE
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Label-free breast cancer detection and classification by convolutional neural network-based on exosomes surface-enhanced raman scattering
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作者 Xiao Ma Honglian Xiong +7 位作者 Jinhao Guo Zhiming Liu Yaru Han Mingdi Liu Yanxian Guo Mingyi Wang Huiqing Zhong Zhouyi Guo 《Journal of Innovative Optical Health Sciences》 SCIE EI CAS CSCD 2023年第2期3-15,共13页
Because the breast cancer is an important factor that threatens women's lives and health,early diagnosis is helpful for disease screening and a good prognosis.Exosomes are nanovesicles,secreted from cells and othe... Because the breast cancer is an important factor that threatens women's lives and health,early diagnosis is helpful for disease screening and a good prognosis.Exosomes are nanovesicles,secreted from cells and other body fluids,which can reflect the genetic and phenotypic status of parental cells.Compared with other methods for early diagnosis of cancer(such as circulating tumor cells(CTCs)and circulating tumor DNA),exosomes have a richer number and stronger biological stability,and have great potential in early diagnosis.Thus,it has been proposed as promising biomarkers for diagnosis of early-stage cancer.However,distinguishing different exosomes remain is a major biomedical challenge.In this paper,we used predictive Convolutional Neural model to detect and analyze exosomes of normal and cancer cells with surface-enhanced Raman scattering(SERS).As a result,it can be seen from the SERS spectra that the exosomes of MCF-7,MDA-MB-231 and MCF-10A cells have similar peaks(939,1145 and 1380 cm^(-1)).Based on this dataset,the predictive model can achieve 95%accuracy.Compared with principal component analysis(PCA),the trained CNN can classify exosomes from different breast cancer cells with a superior performance.The results indicate that using the sensitivity of Raman detection and exosomes stable presence in the incubation period of cancer cells,SERS detection combined with CNN screening may be used for the early diagnosis of breast cancer in the future. 展开更多
关键词 EXOSOMES surface-enhanced Raman scattering(SERS) breast cancer convolutional neural model LABEL-FREE
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Node scattering manipulation based on trajectory model in wireless sensor network 被引量:2
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作者 裴智强 徐昌庆 藤劲 《Journal of Central South University》 SCIE EI CAS 2010年第5期991-999,共9页
To deploy sensor nodes over the area of interest,a scheme,named node scattering manipulation,was proposed.It adopted the following method:during node scattering,the initial states of every node,including the velocity ... To deploy sensor nodes over the area of interest,a scheme,named node scattering manipulation,was proposed.It adopted the following method:during node scattering,the initial states of every node,including the velocity and direction,were manipulated so that it would land in a region with a certain probability;every sensor was relocated in order to improve the coverage and connectivity.Simultaneously,to easily analyze the process of scattering sensors,a trajectory model was also proposed.Integrating node scattering manipulation with trajectory model,the node deployment in wireless sensor network was thoroughly renovated,that is,this scheme can scatter sensors.In practice,the scheme was operable compared with the previous achievements.The simulation results demonstrate the superiority and feasibility of the scheme,and also show that the energy consumption for sensors relocation is reduced. 展开更多
关键词 WORK node scattering manipulation trajectory model energy consumption
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Hybrid micromotion-scattering center model for synthetic aperture radar micromotion target imaging 被引量:1
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作者 Yuliang Qin Bin Deng +1 位作者 Zonghui Huang Wuge Su 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2013年第6期931-937,共7页
Micromotion is an important target feature, although the target micromotion has an unfavorable influence on the synthetic aperture radar (SAR) image interpretation due to defocusing. This paper introduces micromotio... Micromotion is an important target feature, although the target micromotion has an unfavorable influence on the synthetic aperture radar (SAR) image interpretation due to defocusing. This paper introduces micromotion parameters into the scattering center model to obtain a hybrid micromotion-scattering center model, and then proposes an optimization algorithm based on the maximal likelihood estimation to solve the model for jointly obtaining target motion and scattering parameters. Initial value estimation methods using targets' ghost images are then presented to guarantee the global and fast convergence. Simulation results show the effectiveness of the proposed algorithm especially in high precision estimation and multiple targets processing. 展开更多
关键词 synthetic aperture radar (SAR) MICROMOTION microDoppler parameter estimation scattering center model
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A 3D Geometry-Based Scattering Model for Vehicleto-Vehicle Wideband MIMO Relay-Based Cooperative Channels 被引量:1
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作者 Xiaolin Liang Xiongwen Zhao +2 位作者 Shu Li Qi Wang Wenbing Lu 《China Communications》 SCIE CSCD 2016年第10期1-10,共10页
In this paper, a three-dimensional(3D) geometry- based stochastic scattering model(GBSSM) for wideband multi-input multi-output(MIMO) vehicle-to-vehicle(V2V) relay-based cooperative fading channel based on geometrical... In this paper, a three-dimensional(3D) geometry- based stochastic scattering model(GBSSM) for wideband multi-input multi-output(MIMO) vehicle-to-vehicle(V2V) relay-based cooperative fading channel based on geometrical three-cylinder is proposed. Non-line-of-sight(NLOS) propagation condition is assumed in amplify-and-forward(AF) cooperative networks from the source mobile station(S) to the destination mobile station(D) via the mobile relay station(R). We extend the proposed narrowband model to wideband and also introduce the carrier frequency and bandwidth into the model. To avoid complicated procedure in deriving the analytical expressions of the channel parameters and functions, the channel is realized first. By using the realized channel matrix, the channel properties are further investigated. 展开更多
关键词 geometry-based scattering model MIMO relay-based cooperative communication vehicle-to-vehicle(V2V) WIDEBAND
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Sparsity-based efficient simulation of cluster targets electromagnetic scattering
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作者 TIAN Yuguang LIU Yixin +3 位作者 CHEN Xuan CHEN Penghui WANG Jun CHEN Junwen 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2023年第2期299-306,共8页
An efficient and real-time simulation method is proposed for the dynamic electromagnetic characteristics of cluster targets to meet the requirements of engineering practical applications.First,the coordinate transform... An efficient and real-time simulation method is proposed for the dynamic electromagnetic characteristics of cluster targets to meet the requirements of engineering practical applications.First,the coordinate transformation method is used to establish a geometric model of the observation scene,which is described by the azimuth angles and elevation angles of the radar in the target reference frame and the attitude angles of the target in the radar reference frame.Then,an approach for dynamic electromagnetic scattering simulation is proposed.Finally,a fast-computing method based on sparsity in the time domain,space domain,and frequency domain is proposed.The method analyzes the sparsity-based dynamic scattering characteristic of the typical cluster targets.The error between the sparsity-based method and the benchmark is small,proving the effectiveness of the proposed method. 展开更多
关键词 geometric model of the observation scene dynamic electromagnetic scattering simulation sparsity-based method
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Generative adversarial network-based atmospheric scattering model for image dehazing 被引量:2
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作者 Jinxiu Zhu Leilei Meng +2 位作者 Wenxia Wu Dongmin Choi Jianjun Ni 《Digital Communications and Networks》 SCIE CSCD 2021年第2期178-186,共9页
This paper presents a trainable Generative Adversarial Network(GAN)-based end-to-end system for image dehazing,which is named the DehazeGAN.DehazeGAN can be used for edge computing-based applications,such as roadside ... This paper presents a trainable Generative Adversarial Network(GAN)-based end-to-end system for image dehazing,which is named the DehazeGAN.DehazeGAN can be used for edge computing-based applications,such as roadside monitoring.It adopts two networks:one is generator(G),and the other is discriminator(D).The G adopts the U-Net architecture,whose layers are particularly designed to incorporate the atmospheric scattering model of image dehazing.By using a reformulated atmospheric scattering model,the weights of the generator network are initialized by the coarse transmission map,and the biases are adaptively adjusted by using the previous round's trained weights.Since the details may be blurry after the fog is removed,the contrast loss is added to enhance the visibility actively.Aside from the typical GAN adversarial loss,the pixel-wise Mean Square Error(MSE)loss,the contrast loss and the dark channel loss are introduced into the generator loss function.Extensive experiments on benchmark images,the results of which are compared with those of several state-of-the-art methods,demonstrate that the proposed DehazeGAN performs better and is more effective. 展开更多
关键词 Dehazing Edge computing applications Atmospheric scattering model Contrast loss
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High Energy ^-pp and pp Elastic Scatterings in QCD Inspired Model 被引量:2
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作者 LU Juan MA Wei-Xing HE Xiao-Rong 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第4期715-718,共4页
We propose QCD inspired model to calculate ^-pp and pp elastic scatterings at high energies in this paper. A calculation for total cross section of ^-pp and pp is performed in which the contributions from gluon-gluon,... We propose QCD inspired model to calculate ^-pp and pp elastic scatterings at high energies in this paper. A calculation for total cross section of ^-pp and pp is performed in which the contributions from gluon-gluon, quark-quark, and gluon-quark interactions are included. Our results show that the QCD inspired model gives a perfect fit to experimental data of total cross section both for ^-pp and pp elastic scatterings at the whole energy region where experimental data existed at FNAL and CERN. 展开更多
关键词 QCD inspired model eikonal profile function high-energy elastic scattering
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Calculating the shading reduction coefficient of photovoltaic system efficiency using the anisotropic sky scattering model 被引量:2
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作者 Bin Hu Jiawei Wu +2 位作者 Peng Li Wei Sun Jinyu Xiao 《Global Energy Interconnection》 EI CAS CSCD 2022年第4期375-384,共10页
The front-row shading reduction coefficient is a key parameter used to calculate the system efficiency of a photovoltaic(PV)power station.Based on the Hay anisotropic sky scattering model,the variation rule of solar r... The front-row shading reduction coefficient is a key parameter used to calculate the system efficiency of a photovoltaic(PV)power station.Based on the Hay anisotropic sky scattering model,the variation rule of solar radiation intensity on the surface of the PV array during the shaded period is simulated,combined with the voltage-current characteristics of the PV modules,and the shadow occlusion operating mode of the PV array is modeled.A method for calculating the loss coefficient of front shadow occlusion based on the division of the PV cell string unit and Hay anisotropic sky scattering model is proposed.This algorithm can accurately evaluate the degree of influence of the PV array layout,wiring mode,array spacing,PV module specifications,and solar radiation on PV power station system efficiency.It provides a basis for optimizing the PV array layout,reducing system loss,and improving PV system efficiency. 展开更多
关键词 Shading reduction coefficient System efficiency Hay anisotropic sky scattering model PV cells string unit
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Comparison between Microwave Coherent and Incoherent Scattering Models in Corn Field
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作者 王芳 《Agricultural Science & Technology》 CAS 2012年第4期913-916,共4页
[Objective] The aim was to compare and analyze microwave coherent and incoherent scattering models in a corn field. [Method] In the research, based on a coherent scattering model (Stile), we proposed a coherent scat... [Objective] The aim was to compare and analyze microwave coherent and incoherent scattering models in a corn field. [Method] In the research, based on a coherent scattering model (Stile), we proposed a coherent scattering model exclusive for corn, in which, physical optics (PO) and infinite-length dielectric cylinder were used to calculate single-scattering matrices of corn leaves and stalks. In addition, coherent components produced from interaction among the scattering mechanisms were also considered and this coherent model was compared with the Michigan Mi- crowave Canopy Scattering (MIMICS) model. The measured data in a corn filed in Gongzhuling in Jilin Province were used as the input parameters of the coherent and incoherent models. We simulated backscattering coefficients of VV and HH po- larization at L and C bands and made a comparison between the simulation results. [Result] The simulation results at L-band were poor, which indicated that we could not find regularity at early growth stage of vegetation. In addition, comparisons be- tween coherent and incoherent scattering models proved that the coherence triggered by the scattering mechanism was small. [Conclusion] In the research, we analyzed differences between coherent and incoherent scattering models with change of incident angle, and further analysis on the differences with change of vegetation and soil needed to be made in future. 展开更多
关键词 Coherent scattering model Incoherent scattering model Corn field Anal- ysis and comparison
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Multiple scattering and modeling of laser in fog 被引量:1
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作者 Ji-Yu Xue Yun-Hua Cao +5 位作者 Zhen-Sen Wu Jie Chen Yan-Hui Li Geng Zhang Kai Yang Ruo-Ting Gao 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第6期311-319,共9页
When a laser is transmitted in fog, and the water droplets will scatter and absorb the laser, which affects the intensity of the laser transmission and the accuracy of radar detection. Therefore, it is of great signif... When a laser is transmitted in fog, and the water droplets will scatter and absorb the laser, which affects the intensity of the laser transmission and the accuracy of radar detection. Therefore, it is of great significance to study the laser transmission in the fog. At present, the main method of calculating the scattering and attenuation characteristics of fog is based on the radiation transmission theory, which is realized by a large number of numerical calculations or physical simulation methods, which takes time and cannot meet the requirements for obtaining the fast and accurate results. Therefore, in this paper established are a new laser forward attenuation model and backward attenuation model in low visibility fog. It is found that in low visibility environments, the results calculated by the Monte Carlo method are more accurate than those from most of the existing forward attenuation models. For the cases of 0.86-μm, 1.06-μm, 1.315-μm, 10.6-μm typical lasers incident on different fogs with different visibilities, a backscatter model is established, the error between the fitting result and the calculation result is analyzed, the backward attenuation fitting parameters of the new model are tested, and a more accurate fitting result is obtained. 展开更多
关键词 Mie theory Monte Carlo method engineering model multiple scattering error analysis
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Generalized 3D Scattering Channel Model with MIMO Antenna Systems 被引量:5
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作者 Jie Zhou Hao Jiang Hisakazu Kikuchi 《China Communications》 SCIE CSCD 2016年第5期66-81,共16页
In this paper, a generalized three-dimensional(3D) scattering channel model for macrocellular land mobile environments is considered. This model simultaneously describes angular arrival of multi-path signals in the az... In this paper, a generalized three-dimensional(3D) scattering channel model for macrocellular land mobile environments is considered. This model simultaneously describes angular arrival of multi-path signals in the azimuth and elevation planes in an environment where uniformly distributed scatterers are assumed to be present in hemispheroids around the base station(BS) and mobile station(MS). Using this channel model, we first derive the closed-form expression for the joint and marginal probability density functions of the angle-of-arrival and time-of-arrival measured at the BS and the MS corresponding to the azimuth and elevation angles. Next, we derive an expression for the Doppler spectral distribution caused by motion of the MSs. Furthermore, we analyze the performance of multiple-input multiple-output antenna systems numerically. The results show that the proposed 3D scattering channel model performs better than previously proposed two-dimensional(2D) models for indoor and outdoor environments. We compare the results with previous scattering channel models and measurement results to validate the generalizability of our model. 展开更多
关键词 3D scattering channel model angle of arrival Doppler spectra multiple-input multiple-output
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Theoretical Models of Light Scattering Applied in Sizing Particles in Coal Water Slurry 被引量:1
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作者 王仁哲 张荣曾 徐志强 《Journal of China University of Mining and Technology》 2004年第1期64-66,81,共4页
Advantges and disadvantage of Mie scattering model and Fraunhofer diffraction model are discussed. The result shows that 1) the Fraunhofer diffraction model is simple in design and fast in operation, which is quite su... Advantges and disadvantage of Mie scattering model and Fraunhofer diffraction model are discussed. The result shows that 1) the Fraunhofer diffraction model is simple in design and fast in operation, which is quite suitable for on-line control and 2) the intensity and energy distribution of diffracted light of both the Mie scattering model and the Fraunhofer theoretical model are compared and researched. Feasibility of using the Fraunhofer diffraction model to replace the Mie scattering model in measuring particles in coal water slurry is demonstrated. 展开更多
关键词 coal water slurry light scattering model Mie scattering model DIFFRACTION
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Scattering center modeling for low-detectable targets 被引量:1
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作者 CHEN Yanxi GUO Kunyi +1 位作者 XIAO Guangliang SHENG Xinqing 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2022年第3期511-521,共11页
The scattering centers(SCs)of low-detectable targets(LDTs)have a low scattering intensity.It is difficult to build the SC model of an LDT using the existing methods because these methods mainly concern dominant SCs wi... The scattering centers(SCs)of low-detectable targets(LDTs)have a low scattering intensity.It is difficult to build the SC model of an LDT using the existing methods because these methods mainly concern dominant SCs with strong scattering contributions.This paper presents an SC modeling approach to acquire the weak SCs of LDTs.We employ the induced currents at the LDT to search SCs,and the joint time-frequency transform together with the Hough transform to separate the scattering contributions of different SCs.Particle swarm optimization(PSO)is applied to improve the estimation results of SCs.The accuracy of the SC model built by this approach is verified by a full-wave numerical method.The validation results show that the SC model of the LDT can precisely simulate the signatures of high-resolution images,such as high-resolution range profile and inverse synthetic aperture radar(ISAR)images. 展开更多
关键词 low-detectable target(LDT) stealth target scattering center(SC)model time-frequency representation full-wave method
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Physical model of acoustic forward scattering by cylindrical shell and its experimental validation
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作者 雷波 杨坤德 马远良 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第5期369-377,共9页
Research on the underwater target scattering can provide important theoretical support for target detection. The scattering model of cylindrical shell is established in this paper. It is found that the forward target ... Research on the underwater target scattering can provide important theoretical support for target detection. The scattering model of cylindrical shell is established in this paper. It is found that the forward target strength is much stronger and varies with angles of incident wave less significantly than backward target strength. The received forward signal strength fluctuates with the target moving due to the interference between direct signal and scattering signal, which is most significant when the target approaches the baseline. An experiment is carried out in an anechoic tank to validate the scattering model. The method of acquisiting forward scattering in the tank is proposed. The forward and the backward target strengths are achieved by using the pulse compression technology, and they axe about 3dB less than the modeling results. The forward scattering phenomena of quiescent and moving targets are measured, which are similar to modeling results with different target types. 展开更多
关键词 scattering model forward scattering target strength SHELL
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Application of a multiregion model to the EM scattering from a rough surface with or without a target above it
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作者 王安琪 郭立新 柴草 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第5期12-22,共11页
An efficient multiregion model is introduced to calculate the electromagnetic scattering from a perfectly electrical conducting (PEC) rough surface with or without a PEC target above it. In the multiregion model, th... An efficient multiregion model is introduced to calculate the electromagnetic scattering from a perfectly electrical conducting (PEC) rough surface with or without a PEC target above it. In the multiregion model, the rough surface is split into multiple regions depending on their position along the rough surface. Two intermediate regions are chosen as the dominant region. If a target is located above the rough surface, the target will also be included in the dominant region. The method of moments (MOM) is only adopted on the dominant region to ensure validity. Hence, the new model can greatly reduce the number of unknowns associated with full MOM analysis. The induced electric currents on the other regions are obtained by approximately considering the mutual coupling between different regions along the rough surface. Compared with the published hybrid method, this new model is not only suitable for EM scattering from a target above a rough surface but also applicable for just rough surfaces. Several numerical simulations are presented to show the validity and efficiency of the multiregion model. 展开更多
关键词 multiregion model electromagnetic scattering rough surface method of moments
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Structural modeling of proteins by integrating small-angle x-ray scattering data
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作者 张泳辉 彭俊辉 张志勇 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第12期16-21,共6页
Elucidating the structure of large biomolecules such as multi-domain proteins or protein complexes is challenging due to their high flexibility in solution. Recently, an "integrative structural biology" approach has... Elucidating the structure of large biomolecules such as multi-domain proteins or protein complexes is challenging due to their high flexibility in solution. Recently, an "integrative structural biology" approach has been proposed, which aims to determine the protein structure and characterize protein flexibility by combining complementary high- and lowresolution experimental data using computer simulations. Small-angle x-ray scattering(SAXS) is an efficient technique that can yield low-resolution structural information, including protein size and shape. Here, we review computational methods that integrate SAXS with other experimental datasets for structural modeling. Finally, we provide a case study of determination of the structure of a protein complex formed between the tandem SH3 domains in c-Cb1-associated protein and the proline-rich loop in human vinculin. 展开更多
关键词 protein structure FLEXIBILITY computer simulations small-angle x-ray scattering integrative modeling
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An angular cutoff composite model for investigation on electromagnetic scattering from two-dimensional rough sea surfaces
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作者 聂丁 张民 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第7期216-220,共5页
Based on the local configuration angle division to select the corresponding method for electromagnetic scattering calculation from rough sea surface, this paper presents an angular cutoff composite model: when the lo... Based on the local configuration angle division to select the corresponding method for electromagnetic scattering calculation from rough sea surface, this paper presents an angular cutoff composite model: when the local scattered angle is in the specular region that is given by an approximately 20 degrees cone around the specular direction, the Kirchhoff approximation is applied to evaluate the specular reflection, which dominates the total scattering in this region; the small perturbation method is employed to handle the diffuse reflection which is predominant as the local scattered angle is situated out of the specular region. Numerical results are compared with those of experimental and theoretical models in several configurations as a function of incident angle, wind speed, wind direction. The comparison of numerical results of other experimental and theoretical models in several configurations shows that the new composite model is robust to give accurate numerical evaluations for the sea surface scattering. 展开更多
关键词 electromagnetic scattering composite surface model rough sea surface angular cutoff
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Finite element modeling of acoustic scattering from an encapsulated microbubble near rigid boundary
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作者 黄蓓 张艳丽 +1 位作者 章东 龚秀芬 《Chinese Physics B》 SCIE EI CAS CSCD 2010年第5期378-383,共6页
This article proposes a finite element model (FEM) for predicting the acoustic scattering from an encapsulated microbubble near rigid boundary. The validity of the model is first examined by comparing the acoustic n... This article proposes a finite element model (FEM) for predicting the acoustic scattering from an encapsulated microbubble near rigid boundary. The validity of the model is first examined by comparing the acoustic nonlinear response of a free microbubble with that obtained by the Church model. Then this model is used to investigate the effect of the rigid boundary on acoustic scattering signals from microbubble. The results indicate that the resonance frequency decreases while the oscillation amplitude increases as the microbubble approaches the rigid boundary. In addition, the fundamental component of the acoustic scattering signal is enhanced compared with that of the free microbubble. 展开更多
关键词 bound encapsulated microbubble acoustic scattering finite element model
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