基于多模型和改进WOA算法的Delta机器人柔性夹持器抓取方法研究

[目的]解决Delta机器人柔性夹持器抓取方法存在的控制精度和适应性较差等问题。[方法]以Delta机器人柔性夹持器为研究对象,提出一种多模型和改进鲸鱼算法相结合的Delta机器人柔性夹持器抓取方法。建立稳定抓取优化模型,在抓持对象表面寻求最佳接触位置。建立无损抓取优化模型,在确保稳定抓起物体的前提下使接触力尽可能地小。结合粒子群算法和鲸鱼算法求解模型。通过试验验证了所提抓取方法的优越性。[结果]所提方法不仅具有良好的控制精度,还能够适应不同形状和大小的物体,具有较高的灵活性和适应性,抓取成功率>96%,抓取损伤率为0。[结论]所提方法有效提高了Delta机器人柔性夹持器抓取方法的性能,适用于果蔬和易碎物品的分拣工作。

Delta大通道内镜辅助下后路椎管减压椎间植骨融合术治疗退变性腰椎疾病的临床疗效

目的:探讨Delta大通道内镜辅助下后路椎管减压椎间植骨融合术治疗退变性腰椎疾病的效果。方法:回顾性分析2021年9月~2022年9月我院收治的80例退变性腰椎疾病患者的病历资料,根据患者治疗方式分为观察组(38例,男17例,女21例,年龄61.0±4.9岁)和对照组(42例,男20例,女22例,年龄60.5±5.4岁),观察组患者采取Delta大通道内镜下Endo-PLIF治疗,对照组采取开放后路腰椎椎间融合术治疗,记录两组患者术中出血量、术后引流量、手术时间、手术切口长度、住院时间,比较患者并发症发生情况。于术前、术后1周、1个月、3个月、6个月使用视觉模拟量表(visual analogue scale,VAS)评分评估患者腰痛情况,并采用Oswestry功能障碍指数(Oswestry disability index,ODI)评估患者腰椎功能;使用改良Macnab标准对患者进行疗效评估。根据患者术后1年随访时的腰椎影像学复查结果,使用Bridwell椎间融合标准对患者手术节段融合情况进行评估。结果:观察组患者的术中出血量及术后引流量分别低于对照组(88.46±10.98mL vs 112.99±12.01mL、159.73±18.42mL vs 201.36±23.06mL,P<0.05),手术切口及住院时间分别短于对照组(1.54±0.36cm vs 5.43±1.01cm、6.79±1.22d vs 8.03±1.43d,P<0.05),手术时间长于对照组(162.33±19.57min vs 126.87±23.15min,P<0.05)。80例患者术后均获随访,随访时间15~40个月(19.0±6.3个月)。观察组患者术后1周、术后1个月的VAS评分分别为2.46±0.51分、1.21±0.38分,ODI分别为(17.84±4.15)%、(10.69±1.88)%,均低于对照组[VAS评分分别为3.68±0.62分、2.01±0.41分,ODI分别为(21.33±3.48)%、(12.33±2.17)%,均P<0.05],两组患者术后3个月、术后6个月的VAS评分比较无统计学差异(P>0.05)。观察组治疗优良率为92.11%,与对照组的85.71%比较无统计学意义(P=0.487)。两组患者融合分级比较,差异无统计学意义(Z=0.487,P=0.624)。观察组术后并发症发生率为5.26%,与对照组的9.52%比较无统计学差异(P=0.678)。结论:Delta大通道内镜辅助下后路椎管减压椎间植骨融合术治疗退变性腰椎疾病效果良好,可以减少术中出血量,缩短手术切口和住院时间,更快改善患者术后短期内疼痛、腰椎功能,安全性较好。

单边双通道内镜与Delta大通道内镜技术治疗L5/S1椎间盘突出并椎管狭窄的临床疗效分析

目的 探讨Delta大通道内镜技术与单边双通道内镜技术(unilateral biportal endoscopy, UBE)治疗L5/S1单节段椎间盘突出并椎管狭窄的疗效。方法 回顾性分析2018年1月至2022年8月手术治疗的60例L5/S1单节段腰椎间盘突出并椎管狭窄患者的临床资料,其中32例采用Delta大通道内镜技术行经皮椎板间入路内镜下椎间盘切除术(Delta内镜组),28例采用UBE内镜技术行椎管减压髓核摘除术(UBE组)。比较两组围手术期指标、腰腿痛VAS评分、 ODI及并发症情况,末次随访时按Macnab标准评价疗效。结果 两组患者均顺利完成手术。Delta内镜组术中出血量少于UBE组,手术时间、住院时间短于UBE组(P<0.001)。两组患者术后腰腿痛VAS评分及ODI均较术前明显降低,且Delta内镜组术后3 d腰痛VAS评分及术后1月腿痛VAS评分均低于UBE组(P<0.05)。术后随访6个月,末次随访按Macnab标准评价疗效:Delta内镜组优30例,可2例,优良率为93.75%;UBE组优27例,可1例,优良率为96.43%;组间比较差异无统计学意义(P>0.05)。Delta内镜组硬膜撕裂1例,因撕裂处较小仅严密缝合手术切口;UBE组出现腿部疼痛加重1例。结论 Delta大通道内镜技术与UBE治疗L5/S1单节段椎间盘突出并椎管狭窄均可获得良好的近期效果,但Delta内镜手术术中出血少,软组织损伤小,操作时间短,术后短期疼痛缓解明显,患者恢复快,而UBE适应证范围相对广泛。

Delta并联机器人运动学性能分析与结构参数优化

Delta并联机器人具有速度快、结构简单、承载力强等优点,在钵苗移栽、产品分拣与包装中应用广泛。针对目前Delta并联机器人各结构参数对运动学性能的影响及系统性结构参数优化设计缺乏完整理论体系的问题,本文分析可达工作空间雅可比矩阵条件数分布规律、结构参数约束关系、运动学性能随结构参数的变化规律及相关性,获得条件数分布特性和失真约束条件,在此基础上得出动静平台半径差和主动臂长度增加和从动杆长度减小能够使得机构性能较优。给定设计工作空间,对原结构进行参数优化设计,通过建立包络惩罚函数,采用多元非线性拟合与线性加权组合法得到运动学性能评价函数,结合条件数分布特性和失真约束条件建立优化模型,利用遗传算法进行优化。相较于优化前,优化后可达工作空间体积减小14.26%,设计工作空间的全局条件数均值和全局条件数标准差分别减小31.20%和11.78%,且设计工作空间各截面条件数分布规律验证了条件数分布特性的可靠性。

Delta型FDM打印设备结构参数设定及运动学研究

FDM打印设备的扫描路径、打印速度、温度、层厚等问题是影响制件外形精度和成型效率的工艺参数的重要因素。Delta型结构作为最常用的FDM设备结构型式之一,其末端打印头的运动由多杆共同作用,运动分析较繁琐,为设备的参数设定增添了很大的难度,存在参数设定和运动分析难的问题。从Delta型的结构分析出发,重点研究了各结构尺寸之间的关联,总结了参数设定和计算的依据。考虑到Delta结构的打印头与3个滑车之间坐标的对应关系并不能通过简单推算得出,需要大量的三角函数运算,建立了Delta型结构的正、逆解运动学模型,结合几何的方式详细推导了运动学反解和正解的解法,分析和求解的结果为设定Delta型设备参数和确定控制程序算法提供了理论依据。经过分析与计算,基于并联机构内核的Delta结构采用正运动求解更便于规避正解集合中的不合理结果。

基于Delta分位数映射法的青藏高原中东部IMERG卫星降水误差订正

可靠的降水资料对理解青藏高原水量平衡和水循环过程尤为重要。IMERG(Integrated MultisatellitE Retrievals for Global Precipitation Measurement)是新一代卫星降水产品,具有更广的覆盖范围与更高的时空分辨率,但在高原复杂地形条件下仍然存在较大的不确定性。鉴于此,本研究应用Delta分位数映射法(Quantile Delta Mapping,QDM),对IMERG日降水数据进行偏差订正,使用2001-2010年的中国区域地面气象要素数据集(China Meteorological Forcing Dataset,CMFD)降水数据和IMERG日降水产品分季节建立传递函数,对2011-2014年的IMERG逐日降水进行订正。研究结果表明:(1)Delta分位数映射法能够有效订正IMERG的降水频率、数值和空间分布,对极端降水和负偏差较大区域的订正效果更为明显。订正后的IMERG降水概率分布更加接近观测概率分布,降水偏差也更符合正态分布,改进了对全年和季节降水空间分布的刻画,提高了月降水的精度。(2)订正后日降水量均方根误差由1.49 mm·d^(-1)降低到1.26 mm·d^(-1),精度提高了15.44%;订正后的日降水在不同降水量级的临界成功指数CSI、命中率POD、误报率FAR、准确率Precision和F评分Fscore均有提高,降低了微量和暴量降水的空报率。(3)对极端降水的订正效果显著,降水强度SDII以及极强降水量R95p和R99p的均值更接近观测值;有效提高了对极端降水空间分布的表征,极端降水偏差从30%以上降低到5%以内;SDII、R95p和R99p的均方根误差从1.59 mm·d^(-1)、6.54 mm·d^(-1)、14.89 mm·d^(-1)降为0.65 mm·d^(-1)、3.01 mm·d^(-1)、8.99 mm·d^(-1),精度分别提高了59.12%、53.98%和39.62%。本研究验证了Delta分位数映射法在青藏高原的适用性,有利于为青藏高原气象和水文研究获取更精确的降水数据。

一种具有1~128倍可变增益放大器的低功耗Sigma⁃Delta ADC

为满足传感器应用的低功耗需求,设计并实现了一种低功耗Sigma⁃Delta模数转换器(ADC)芯片。该ADC采用一阶全差分开关电容Sigma⁃Delta调制器,且集成了可编程增益放大器(PGA)和Bandgap;使用1.5 bit量化结构,相较于1 bit量化结构减小了3 dB的量化误差;使用优化的反馈电路,减小了电容失配引入的误差;PGA采用轨到轨的运放电路拓扑,增大了整个芯片的电压适应范围。基于180 nm CMOS工艺对该ADC进行了设计和流片。测试结果表明:该Sigma⁃Delta ADC在采样频率512 kHz、过采样率(OSR)为256时,峰值信噪谐波失真比(SNDR)和有效位数(ENOB)分别为75.29 dB和12.21 bit,芯片功耗仅为0.92 mW。芯片能在2.3~5.5 V宽电源电压范围内正常工作,可实现最大128 V/V的增益。适用于小型传感器的信号测量应用,可以满足小型传感器低功耗、高精度的需求。

一种应用于物联网传感器的伪三阶Delta-Sigma调制器

针对物联网传感器难以同时满足高分辨率与低功耗的瓶颈问题,本文设计了一种伪三阶离散时间delta-sigma调制器.该架构将一阶无源噪声整形SAR(Successive Approximation Register)量化器嵌入传统二阶delta-sigma调制器以实现更强的噪声整形能力.本文设计允许系统在更低的过采样率(Over Sampling Ratio,OSR)下获取更高的峰值SQNR(Signal-to-Quantizing Noise Ratio),有效缓解了系统精度和功耗之间的设计矛盾,并且减少了有源积分器的使用.针对传统有源加法器高功耗和无源加法器存在衰减不确定性的问题,本文提出了一种新型前馈求和量化电路,它具有对衰减不敏感的优势并且降低了第二级有源积分器的驱动压力,这进一步降低了系统的功耗.本文提出的delta-sigma调制器采用180 nm CMOS(Complementary Metal Oxide Semiconductor)工艺制造并测试.在电源电压1.4 V下,芯片测试功耗为47.2μW.在带宽为8 kHz的测试条件下,调制器的DR(Dynamic Range)、峰值SNDR(Signal-to-Noise and Distortion Ratio)和SFDR(Spurious-Free Dynamic Range)分别为97.2 dB,96.6 dB和114.4 dB.因此,Schreier和Walden的SNDR FoM(Figure of Merit)优值达到了178.9 dB和0.053 pJ/step.本文提出的伪三阶delta-sigma调制器在功耗和分辨率之间实现了较好的权衡,为物联网领域的低功耗高分辨率调制器设计提供了较好的解决方案.

油茶果动态抓取Delta机器人正运动学特性研究

针对传统D-H参数法求解机械臂运动学时过程比较复杂的问题,为满足油茶果动态抓取的要求,提出了一种基于旋量理论构建3-R(SS)2Delta机器人正运动学方程的方法。针对3-R(SS)2Delta机器人的结构进行分析;通过旋量理论的指数积公式对该机器人的正运动学特性进行研究,获得机器人的位姿变换矩阵;最后,通过搭建的Delta机器人试验平台运行标准门型轨迹,结果表明:Delta机器人末端执行器能够精准地对传送带上移动的油茶果进行抓取。对比分析正运动学方程的计算值和Delta机器人试验平台试验测量值,得到末端执行器位置值的位置误差为±0.3mm,验证了所提出方法对构建油茶果动态抓取Delta机器人正运动学方程的正确性及可行性,旨在为后续进行油茶果动态抓取的轨迹规划研究奠定基础。

基于事件触发的Delta算子网络控制系统故障检测

针对网络控制系统在高速采样情况下,网络中由于通信网络带宽受限发生时延和丢包所引起的故障问题,文中采用了基于事件触发机制和Delta算子相结合的故障检测方法。在对故障检测滤波器和控制器进行协同设计的同时,在Delta算子滤波器模型中加入构造向量,避免了参数设计时双线性项的产生。构造δ域的Lyapunov-Krasovskii泛函,对残差系统的稳定性和H∞性能进行分析。数值仿真实例验证了文中所提事件触发机制的有效性,并通过残差评价函数证明了其对故障的灵敏度较高。

Numerical study on local scour characteristics around submarine pipelines in the Yellow River Delta silty sandy soil under waves and currents

Due to their high reliability and cost-efficiency,submarine pipelines are widely used in offshore oil and gas resource engineering.Due to the interaction of waves,currents,seabed,and pipeline structures,the soil around submarine pipelines is prone to local scour,severely affecting their operational safety.With the Yellow River Delta as the research area and based on the renormalized group(RNG)k-εturbulence model and Stokes fifth-order wave theory,this study solves the Navier-Stokes(N-S)equation using the finite difference method.The volume of fluid(VOF)method is used to describe the fluid-free surface,and a threedimensional numerical model of currents and waves-submarine pipeline-silty sandy seabed is established.The rationality of the numerical model is verified using a self-built waveflow flume.On this basis,in this study,the local scour development and characteristics of submarine pipelines in the Yellow River Delta silty sandy seabed in the prototype environment are explored and the influence of the presence of pipelines on hydrodynamic features such as surrounding flow field,shear stress,and turbulence intensity is analyzed.The results indicate that(1)local scour around submarine pipelines can be divided into three stages:rapid scour,slow scour,and stable scour.The maximum scour depth occurs directly below the pipeline,and the shape of the scour pits is asymmetric.(2)As the water depth decreases and the pipeline suspension height increases,the scour becomes more intense.(3)When currents go through a pipeline,a clear stagnation point is formed in front of the pipeline,and the flow velocity is positively correlated with the depth of scour.This study can provide a valuable reference for the protection of submarine pipelines in this area.

一种高精度音频Sigma-Delta DAC的设计

设计了一种应用于音频Codec的高精度Sigma-Delta DAC,针对数字插值滤波器占用面积大的问题,提出了乘法器复用的方法,减少数字电路的硬件消耗。为解决Sigma-Delta调制器多比特量化引起的非线性问题,引入DWA(Data Weight Average)算法,提高系统的精度。此外,DCT(Direct Charge Transfer)电路用于实现数字域到模拟域的高精度转换。电路采用0.18μm CMOS工艺,整体DAC的信噪比为105.7dB@1150Hz,有效位数达到17.26bit。

高精度Sigma-Delta调制器设计

近年来,在过采样型模数转换器中,Sigma-Delta模数转换器以其较高的精度成为模数转换器的热点。介绍了一种高精度低功耗的Sigma-Delta调制器设计。使用Matlab工具完成三阶一位量化CIFF结构的系统仿真,在系统级仿真结果的指导下,积分器采用分级结构优化电路结构。积分器电路模块设计采用了全差分式开关电容电路,抑制了谐波失真对输出精度的影响。仿真结果显示:5 S/s挡位时,对应的PVT组合中最低有效位数为17.67 bits;2 kS/s挡位时,对应的PVT组合中最低有效位数为15.89 bits,整个调制器功耗低于3 mW。通过改进调制器整体架构、积分器结构和量化器的设计方法,降低了调制器功耗,提升了调制器精度。

基于扰动Delta-sigma调制器的小数分频器

文中基于扰动Delta-sigma调制器分析并设计了一款动态分频比控制的宽带小数分频器链路。其中,整数分频器链路由高速2分频器和7级2/3分频器链路级联构成,小数控制部分由外加扰动的Delta-sigma调制器构成。通过理论分析和仿真表明,合理选择扰动信号的添加位置,可以有效延长Delta-sigma调制器的输出序列长度,从而平滑Delta-sigma调制器的输出频谱。该分频器电路采用TPS 65 nm射频绝缘体上硅(RFSOI)互补金属氧化物半导体(CMOS)工艺制造,包括焊盘在内的芯片面积为0.57 mm 2。测试结果表明,该小数分频器链路在1.2 V的供电电压下,最大工作电流为22.2 mA,可以在9 GHz~20 GHz的输入频率下动态加载控制字并实现小数分频功能。

采用Mash2-1架构的高精度Sigma-Delta ADC设计

鉴于模数转换器(ADC)在芯片和混合信号处理领域举足轻重的作用,为探索进一步提高模数转换器精度的可能性,满足当今应用系统对模数转换精度的新需求,设计一款基于Mash2-1级联架构的sigma-delta ADC。设计采用TSMC 180 nm CMOS工艺,在完成调制器电路的同时,使用Verilog代码方式实现了配套的误差消除以及数字抽取滤波器。对调制器进行了建模及非理想因素的分析,并通过使用斩波调制技术等手段对电路的非理想性进行优化。经仿真验证,结果表明,本设计在3.3 V电源、27℃工作环境、TT典型工艺条件下,表现出优异的信噪比,总谐波失真等性能指标也较理想,适用于高精度、低失真的应用场合。

中国ETF期权Delta对冲收益的日夜特征研究

期权市场是现代金融市场的重要组成部分,研究期权市场Delta对冲收益的日夜特征,对于理解期权市场运行机制以及降低金融市场风险具有重要意义.本文使用我国2015年—2021年股票ETF期权数据,研究了期权Delta对冲收益的日夜特征.研究结果表明,总体上Delta对冲的隔夜收益为负、日内收益不显著;认购期权和认沽期权的Delta对冲收益具有非对称性,即认购期权日内为负、隔夜为正,而认沽期权恰好相反.即使替换为基于波动率和标的资产价格关系的对冲模型,非对称性异象仍然存在.这些发现不同于美国期权市场的Delta对冲收益日内为正、隔夜为负的特征.本文进一步探讨了可能的成因:从风险溢价看,波动率风险溢价可以解释总体上负的隔夜对冲收益,但是不能解释Delta对冲收益的非对称性;从模型误差看,模型误差与标的资产收益共同作用影响了Delta对冲收益;从交易制度看,T+1交易制度约束造成了标的资产日夜收益反转,进而导致了对冲收益的非对称性,并且T+1交易制度约束越强,对冲收益的非对称性越明显.本文将丰富我国期权市场Delta对冲效率、交易制度对金融市场影响的相关研究,有利于提高投资者的风险管理水平、增进监管者对市场行为的理解,从而推动中国多层次资本市场的高质量发展.

Occurrence,Spatial Distribution,Sources and Risk Assessment of Per-and Polyfluoroalkyl Substances in Surface Sediments of the Yellow River Delta Wetland

Per-and polyfluoroalkyl substances(PFASs)are emerging persistent organic pollutants(POPs).In this study,47 surface sediment samples were collected from the Yellow River Delta wetland(YRDW)to investigate the occurrence,spatial distribution,potential sources,and ecological risks of PFASs.Twenty-three out of 26 targeted PFASs were detected in surface sediment samples from the YRDW,with totalΣ23PFASs concentrations ranging from 0.23 to 16.30 ng g^(-1) dw and a median value of 2.27 ng g^(-1) dw.Perfluorooctanoic acid(PFOA),perfluorobutanoic acid(PFBA)and perfluorooctanesulfonic acid(PFOS)were the main contaminants.The detection frequency and concentration of perfluoroalkyl carboxylic acids(PFCAs)were higher than those of perfluoroal-kanesulfonic acids(PFSAs),while those of long-chain PFASs were higher than those of short-chain PFASs.The emerging PFASs substitutes were dominated by 6:2 chlorinated polyfluoroalkyl ether sulfonic acid(6:2 Cl-PFESA).The distribution of PFASs is significantly influenced by the total organic carbon content in the sediments.The concentration of PFASs seems to be related to human activities,with high concentration levels of PFASs near locations such as beaches and villages.By using a positive matrix factorization model,the potential sources of PFASs in the region were identified as metal plating mist inhibitor and fluoropolymer manufacturing sources,metal plating industry and firefighting foam and textile treatment sources,and food packaging material sources.The risk assessment indicated that PFASs in YRDW sediments do not pose a significant ecological risk to benthic organisms in the region overall,but PFOA and PFOS exert a low to moderate risk at individual stations.

Landsat Image-Based Spatiotemporal Variation Analysis of Erosion and Deposition off the Qingshuigou of the Yellow River Delta from 1984 to 2021

Owing to climate change and human activity,the Qingshuigou of the Yellow River Delta(YRD)has undergone dynamic changes in erosion and deposition.Therefore,studying these changes is important to ensure ecological protection and sustainable development.In this study,the trend of erosion-deposition evolution in the Qingshuigou was investigated based on 38 coastline phases extracted from Landsat series images of the YRD at one-year intervals from 1984 to 2021.The periodicity of the scouring and deposition evolution was also analyzed using wavelet analysis.Results showed that the total area of the Qingshuigou was affected by deposition and erosion and that the fluctuation first increased and then decreased.The total area reached a maximum in 1993.The depositional area first increased and then decreased,whereas the overall erosion area decreased.Deposition and erosion areas showed periodic changes to some extent;however,the periodic signal intensity decreased.Furthermore,factors including channel morphological evolution and variations in water and sediment discharge affect the spatiotemporal dynamics of erosion and deposition processes.The application of nonconsistency tests finally revealed that deposition area and flushing magnitude exhibited non-stationarities,which are potentially attributed to impacts from climatic change drivers.

Management of autoimmune hepatitis induced by hepatitis delta virus

Approximately 12-72 million people worldwide are co-infected with hepatitis B virus(HBV)and hepatitis delta virus(HDV).This concurrent infection can lead to several severe outcomes with hepatic disease,such as cirrhosis,fulminant hepatitis,and hepatocellular carcinoma,being the most common.Over the past few decades,a correlation between viral hepatitis and autoimmune diseases has been reported.Furthermore,autoantibodies have been detected in the serum of patients co-infected with HBV/HDV,and autoimmune features have been reported.However,to date,very few cases of clinically significant autoimmune hepatitis(AIH)have been reported in patients with HDV infection,mainly in those who have received treatment with pegylated interferon.Interestingly,there are some patients with HBV infection and AIH in whom HDV infection is unearthed after receiving treatment with immunosuppressants.Consequently,several questions remain unanswered with the challenge to distinguish whether it is autoimmune or“autoimmune-like”hepatitis being the most crucial.Second,it remains uncertain whether autoimmunity is induced by HBV or delta virus.Finally,we investigated whether the cause of AIH lies in the previous treatment of HDV with pegylated interferon.These pressing issues should be elucidated to clarify whether new antiviral treatments for HDV,such as Bulevirtide or immu-nosuppressive drugs,are more appropriate for the management of patients with HDV and AIH.

Activity Pattern and Habitat Use of Shorebirds in an Artificial Wetland Complex:A Case Study of Breeding Pied Avocet in the Yellow River Delta,China

With the loss of substantial natural wetlands in coastal zones,artificial wetlands provide alternative habitats for many shorebirds.Scientific management of artificial wetlands used by shorebirds plays an important role in maintaining the stability of shorebird population.Satellite tracking technique can obtain high-precision location information of individuals day and night,providing a good technical support for the study of quantitative relationship between waterfowls and their habitats.In this study,satellite tracking method,Remote Sensing(RS)and Geographic Information System(GIS)technology were used to analyze the activity pattern and habitat utilization characteristics of Pied Avocet during breeding period in an artificial wetland complex in the Yellow River Delta(YRD),China.The results showed that the breeding Pied Avocets had a small range of activity,with a total core and main home range of 33.10 km^(2) and 216.30 km^(2),respectively.This species tended to forage in the pond and salt pan during the day and night,respectively,with an unfixed staying time in the breeding ground.The distance between breeding ground and feeding ground was less than 6 km.It is emphasized that in addition to improving the conditions of the remaining natural habitats,effective managing artificial habitats is a priority for shorebird conservation.This research could provide reference for the management of artificial wetlands in coastal zones and supply technique support for the protection of shorebirds and their habitats,and alleviate human-bird conflicts and sustainable development of coastal zones.