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Separation and cleaning of Leymus chinensis seed threshing material based on gas-solid coupling

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International Journal of Agricultural and Biological Engineering 2023年第5期16卷 283-290页

作者： Zongyu Ma Qihao Wan weiwei Liu Yingzhong Zhang Ku Bu Wenliang Du School of Mechanical Engineering Dalian University of TechnologyDalian 116024China Institute of Grassland Research Chinese Academy of Agricultural SciencesHohhot 010010China College of Mechanical and Electrical Engineering Inner Mongolia Agricultural UniversityHohhot 010018China

The aim of this study was to improve the cleaning performance of the Leymus chinensis seed threshing material separation and cleaning device,and to clarify the movement law and characteristics of the Leymus chinensis seed threshing material during the cleaning process.A numerical simulation of the separation and cleaning process of Leymus chinensis seed threshing material was performed using the computational fluid dynamics discrete element *** to the streamline distribution of the gas-solid coupling,the movement of Leymus chinensis seeds during the cleaning process was ***,the average speed and quantity of Leymus chinensis seed threshing material in different separation and cleaning zones were studied over ***,the distribution principle of the threshing material was obtained,and a verification test of the under-sieve distribution was *** test results showed that the numerical simulation was consistent with the distribution trend of the *** cleaning performance verification test showed that the impurity content and the loss rate of the separation and cleaning device were 27.3%and 3.3%,where the test results,compared with those of the numerical simulation,showed a reduction of 1.5%and 0.8%,*** is feasible to apply the theory and method of gas-solid coupling to simulate the separation and cleaning process of Leymus chinensis seeds.

关键词： cleaning performance gas-solid coupling Leymus chinensis seeds numerical simulation separation and cleaning

Lightweight detection method for lotus seedpod in natural environment

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International Journal of Agricultural and Biological Engineering 2023年第6期16卷 197-206,F0004页

作者： Tao tang Xu Wang Zenghong Ma weiwei Hong Gaohong Yu Bingliang Ye Faculty of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Key Laboratory of Transplanting Equipment and Technology of Zhejiang Province Hangzhou 310018China Special Equipment Institute Hangzhou Vocational&Technical CollegeHangzhou 310018China

In order to solve the problems of the current target detection algorithms,such as poor discrimination of occluded targets,multiple parameters,complex networks,large amounts of computation,and not conducive to the deployment of mobile terminals,a lightweight lotus seedpod detection method based on YOLOv5s model was proposed in this ***,the dataset was augmented by using a combination of offline and online augmentation,which improved the adaptability and robustness of the model in complex ***,a lightweight Ghost convolution module was introduced to replace the original convolution,and a lightweight bidirectional feature pyramid network was designed,which could enhance the feature extraction and fusion capability of the network and reduce the amount of calculation and model size;On this basis,the combination of WIoU loss function and Mish activation function was adopted to improve the accuracy of feature ***,the knowledge distillation training strategy was used to ensure the proposed lightweight model has the learning ability of a complex network model,improving the recall and precision of model *** results of the ablation study show that the proposed method effectively improves the detection performance of the YOLOv5s model for lotus *** mean average precision of the improved model was 89.7%,compared with the original YOLOv5s model increased by 2.8%,and the parameters and FLOPs were reduced by 2.36M and 7.3G,*** with other detection algorithm models,the proposed algorithm model has the advantages of less computation,smaller model size,and higher detection ***,the proposed improved optimization method based on the YOLOv5s model can effectively detect lotus seedpods,which provides theoretical research and technical support for intelligent picking of lotus seedpods in the actual operating environment.

关键词： lotus seedpod detection deep Learning data augmentation lightweight knowledge distillation natural environment

Numerical simulation on solidification behavior and structure of 38CrMoAl large round bloom using CAFE model

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Journal of Iron and Steel Research(International) 2023年第6期30卷 1222-1233页

作者： Rui-song tan Wei Liu Bo Song Shu-feng Yang Yong-feng Chen Xiao-tan Zuo Yan Huang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Wuhu Xinxing Ductile Pipe Co. Ltd.Wuhu 241002AnhuiChina

A coupled cellular automaton-finite element model was developed to simulate the solidification behavior and structure of 38CrMoAl large round bloom,in which mold electromagnetic stirring+final electromagnetic stirring was taken into consideration,under different superheat,casting speeds,and secondary cooling water *** trials for infrared temperature measurement and macro etch experiments of the post-test round bloom samples were used to verify the simulated solidification structure and temperature *** simulation results show that superheat and secondary cooling water flow have little influence on the surface temperature,center temperature,and center solid fraction while casting speed has a more obvious influence on solidification *** the increase in the casting speed of 0.02 m min^(-1),the solidification position is prolonged by about 1.64 *** the increasing specific water ratio by 0.02 L kg^(-1) each,the surface temperature of the secondary cooling zones decreases by about 18℃,and the solidification position shortens by about 0.11 *** the superheat increases from 10 to 40℃,the ratio of the equiaxed crystal zone decreases from 35.98% to 23.98%.The casting speed and secondary cooling water flow increase the equiaxed crystal ratios of the large round bloom,but neither is significant,both being about 2%.

关键词： 38CrMoAl large round bloom CAFE model Solidification structure Superheat Casting speed Secondary cooling water flow

Anti-Overturning Fully Symmetrical Triboelectric Nanogenerator Based on an Elliptic Cylindrical Structure for All-Weather Blue Energy Harvesting

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Nano-Micro Letters 2022年第7期14卷 342-353页

作者： Dujuan tan Qixuan Zeng Xue Wang Songlei Yuan Yanlin Luo Xiaofang Zhang Liming tan Chenguo Hu Guanlin Liu Department of Applied Physics State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing UniversityChongqing 400044People’s Republic of China Center On Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanningGuangxi 530004People’s Republic of China

Triboelectric nanogenerators(TENGs) have shown promising potential for large-scale blue energy harvesting. However, the lack of reasonable designs has largely hindered TENG from harvesting energy from both rough and tranquil seas. Herein, a fully symmetrical triboelectric nanogenerator based on an elliptical cylindrical structure(EC-TENG) is proposed for all-weather blue energy harvesting. The novel elliptical cylindrical shell provides a unique selfstability, high sensitivity to wave triggering, and most importantly, an anti-overturning capability for the EC-TENG. Moreover, benefiting from its internal symmetrical design, the EC-TENG can produce energy normally, even if it was overturned under a rude oscillation in the rough seas, which distinguishes this work from previous reported TENGs. The working mechanism and output performance are systematically studied. The as-fabricated EC-TENG is capable of lighting 400 light-emitting diodes and driving small electronics. More than that, an automatic monitoring system powered by the EC-TENG can also monitor the water level in real-time and provide an alarm if necessary. This work presents an innovative and reliable approach toward all-weather wave energy harvesting in actual marine environments.

关键词： Anti-overturning Fully symmetrical Elliptic cylindrical Triboelectric nanogenerator Wave energy

宫腔镜联合CD138及子宫内膜微生态检测对慢性子宫内膜炎的诊断价值

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河南外科学杂志 2024年第2期30卷 20-23页

作者： Mahmood Aamir 张洁谭丽郑州大学第二附属医院生殖医学部郑州450014

目的探讨宫腔镜联合白细胞分化抗原138(CD138)及子宫内膜微生态检测对慢性子宫内膜炎(CE)的诊断价值。方法纳入2020-06—2023-05郑州大学第二附属医院生殖医学部收治的行体外受精-胚胎移植(IVF-ET)失败的541例患者,A组(101例)行宫腔镜联... 详细信息

目的探讨宫腔镜联合白细胞分化抗原138(CD138)及子宫内膜微生态检测对慢性子宫内膜炎(CE)的诊断价值。方法纳入2020-06—2023-05郑州大学第二附属医院生殖医学部收治的行体外受精-胚胎移植(IVF-ET)失败的541例患者,A组(101例)行宫腔镜联合CD138及子宫内膜微生物组群检查,B组(240例)行宫腔镜联合CD138,C组(200例)行宫腔镜检查。分析三种检查方法对CE的诊断价值。结果A组、B组、C组CE的检出率分别为74.26%、62.50%、51.50%,差异有统计学意义(P<0.05)。C组宫腔镜的漏诊率为16.67%,B组的漏诊率为9.90%。三联诊断的准确率高于三者单独诊断与二联诊断(P<0.05)。结论宫腔镜联合CD138与子宫内膜微生物组群检测,能提高IVF-ET失败患者的CE检出率,降低漏诊率,并指导临床精准治疗。

关键词：体外受精-胚胎移植宫腔镜白细胞分化抗原138 子宫内膜微生物组群

社交媒体下的原生广告赞助披露:研究综述与展望

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信息系统学报 2024年第1期 132-155页

作者：贾微微别永越李晗蒋玉石吉林财经大学管理科学与信息工程学院吉林长春130117 西南交通大学经济管理学院四川成都610031

社交媒体蓬勃发展带来信息服务与信息沟通的颠覆式变革。原生广告兴起引发学者对赞助披露规范与机制的新审视。本文基于系统述评及文献计量,呈现赞助披露研究进展,诠释现有研究理论视角、研究范式,厘清赞助披露七种模式及区别,结合说服... 详细信息

社交媒体蓬勃发展带来信息服务与信息沟通的颠覆式变革。原生广告兴起引发学者对赞助披露规范与机制的新审视。本文基于系统述评及文献计量,呈现赞助披露研究进展,诠释现有研究理论视角、研究范式,厘清赞助披露七种模式及区别,结合说服知识模型和叙事说服理论提出双说服路径赞助披露广告刺激反应模型,从信息加工及关系视角解构社交媒体赞助披露对广告效果的影响,拓展了原生广告理论研究,为数字经济下的信息系统实践带来启示。

关键词：原生广告赞助披露广告识别说服知识模型叙事说服

基于WPA-Prophet模型的区域用电量预测

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现代信息科技 2024年第6期8卷 132-135页

作者：谭曾盛王志兵湖南工业大学计算机学院湖南株洲412007

为了获得精度更高的用电量预测模型,采用狼群算法对Prophet模型的关键参数进行寻优,构建基于WPA优化Prophet的用电量预测模型。实验数据为澳大利亚维多利亚州2015—2019年五年的日用电量,使用前四年作为测试集,最后一年验证预测结果的... 详细信息

为了获得精度更高的用电量预测模型,采用狼群算法对Prophet模型的关键参数进行寻优,构建基于WPA优化Prophet的用电量预测模型。实验数据为澳大利亚维多利亚州2015—2019年五年的日用电量,使用前四年作为测试集,最后一年验证预测结果的准确性,预测结果的评价指标采用均方根误差和平均绝对百分比误差。实验结果表明,通过WPA优化后的Prophet模型预测精度得到了有效提升,为提升区域用电量预测精度提供了参考。

关键词： Prophet模型狼群算法用电量预测时间序列

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土壤微塑料计量技术现状研究及建议策略

品牌与标准化 2024年第4期 214-217页

作者：张明婷邵微维朱培娟黄佳意南京市计量监督检测院江苏南京210000

土壤微塑料是目前全球关注的焦点之一。目前,对土壤微塑料的计量技术研究相对较少,无法更加精准测量土壤中的微塑料,进而无法准确评估土壤微塑料污染状况。本文研究了土壤微塑料计量技术的现状,并提出了土壤微塑料计量发展策略,以填补... 详细信息

土壤微塑料是目前全球关注的焦点之一。目前,对土壤微塑料的计量技术研究相对较少,无法更加精准测量土壤中的微塑料,进而无法准确评估土壤微塑料污染状况。本文研究了土壤微塑料计量技术的现状,并提出了土壤微塑料计量发展策略,以填补国内微塑料计量方法的空白,支撑打好净土保卫战。

关键词：土壤微塑料计量发展策略

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腹腔镜与内镜联合治疗对胃肠道肿瘤患者短期创伤程度的评估

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中国现代药物应用 2024年第13期18卷 51-53页

作者：叶双娇谭大成上饶东信第五医院消化内科 334000

目的评估腹腔镜与内镜联合治疗对胃肠道肿瘤患者短期创伤程度。方法抽取胃肠道肿瘤患者68例为观察对象,按随机数字表法分为观察组(n=34)和对照组(n=34)。对照组给予传统开腹手术治疗,观察组给予内镜联合腹腔镜治疗。对比两组患者创伤程... 详细信息

目的评估腹腔镜与内镜联合治疗对胃肠道肿瘤患者短期创伤程度。方法抽取胃肠道肿瘤患者68例为观察对象,按随机数字表法分为观察组(n=34)和对照组(n=34)。对照组给予传统开腹手术治疗,观察组给予内镜联合腹腔镜治疗。对比两组患者创伤程度、炎症因子水平及临床效果。结果观察组患者手术切口长度(2.39±1.02)cm短于对照组的(7.21±1.32)cm,术中出血量(34.96±5.96)ml少于对照组的(65.13±5.12)ml,术后1 d视觉模拟评分法(VAS)评分(3.12±1.21)分较对照组的(4.96±1.01)分更低(P<0.05)。观察组患者复发率6.25%、并发症发生率2.94%较对照组的28.57%、17.65%更低(P<0.05)。结论相较于传统开腹手术,腹腔镜联合内镜应用于胃肠道肿瘤的治疗中减轻了手术对机体的短期创伤,患者应激水平低,免疫抑制轻,救治安全性更高。

关键词：胃肠道肿瘤腹腔镜内镜短期创伤程度临床效果