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Cost-effective method for degradability identification of MSW using convolutional neural network for on-site composting

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International Journal of Agricultural and Biological Engineering 2021年第4期14卷 233-237页

作者： Jingjing Huang Sihui Dai Heming Hu Hongduo Zhang jingxin xie Ming Li Hunan Agricultural University Changsha 410128China Hunan Agricultural Equipment Research Institute Changsha 410125China Graduate School of Agricultural and Life Sciences the University of TokyoTokyo 113-0033Japan

Automatically identifying the degradability of municipal solid waste(MSW)is one of the key prerequisites for on-site composting to prevent contaminations from undegradable *** this study,a cost-effective method was proposed for the degradability identification of ***,the trainable images in the datasets were increased by performing four different sizes of cropping operations on the original images captured ***,a lite convolutional neural network(CNN)model was built with only 3.37 million parameters,and then a total of eight models were trained on these datasets with and without the image augmentation operations,***,a degradability identification system was built for on-site composting,where the images were cut to different sizes of small squares for prediction,and the experiments were conducted to find the best combinations of the trained models and the cutting *** results showed that the validation accuracies of the models trained with the augmentation operations were 0.91-2.07 percentage points higher,and in the evaluation of the degradability identification system the best result was achieved by the combination of W8A dataset and cutting size of 1/14 reached an accuracy of 91.58%,which indicated the capability of this cost-effective method to identify the degradability of MSW.

关键词： municipal solid waste degradability identification cost-effective CNN on-site composting image classification

Ultrafine Co nanoparticles confined in nitrogen-doped carbon toward two-electron oxygen reduction reaction for H_(2)O_(2) electrosynthesis in acidic media

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Chinese Chemical Letters 2023年第11期34卷 263-268页

作者： Xiaoqing Cui Lijie Zhong Xu Zhao jingxin xie Dequan He Xin Yang Kanglong Lin Huan Wang Li Niu Guangdong Engineering Technology Research Center for Sensing Materials&Devices Guangzhou Key Laboratory of Sensing Materials&DevicesCenter for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringSchool of Civil EngineeringGuangzhou UniversityGuangzhou 510006China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Electrocatalytic production of hydrogen peroxide(H_(2)O_(2))by two-electron oxygen reduction reaction(2e^(-)ORR)under acidic condition has been considered to have great application *** nanoparticles(CoNPs)coupled with N-doped carbon are a class of potential *** effective strategies to further enhance their performances are to improve the active sites and ***,the material containing ultrafine CoNPs confined in a nitrogen-doped carbon matrix(NC@CoNPs)was synthesized by pyrolyzing corresponding precursors,which was obtained through regulating the topological structure of ZIF-67/ZIF-8 with dopamine(DA).The DA self-polymerization process induced the formation of CoNPs with smaller sizes and formed polydopamine film decreased the detachment of CoNPs from the *** density of Co-N_(x) active sites and defective sites could be identified on NC@CoNPs,leading to high activity and H_(2)O_(2) selectivity,with an onset potential of 0.57 V(***)and∼90%selectivity in a wide potential *** on-site electrochemical removal of organic pollutant was achieved rapidly through an electro-Fenton process,demonstrating its great promise for on-site water treatment application.

关键词： Oxygen reduction reaction H_(2)O_(2)production Confined Co nanoparticles Electrocatalysis Acidic media

Phosphorous and selenium tuning Co-based non-precious catalysts for electrosynthesis of H_(2)O_(2)in acidic media

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Chinese Chemical Letters 2024年第1期35卷 475-481页

作者： jingxin xie Lijie Zhong Xin Yang Dequan He Kanglong Lin Xiaoxia Chen Huan Wang Shiyu Gan Li Niu Guangdong Engineering Technology Research Center for Photoelectric Sensing Materials&Devices Guangzhou Key Laboratory of Sensing Materials&DevicesCenter for Advanced Analytical ScienceSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Department of Chemistry and Environment Science Fujian Provincial Key Laboratory of Modern Analytical Science and Separation TechnologyMinnan Normal UniversityZhangzhou 363000China

Electrosynthesis of hydrogen peroxide(H2O2)is an on-site method that enables independent distribution applications in many fields due to its small-scale and sustainable *** crucial point remains developing highly active,selective and cost-effective *** electrosynthesis of H2O2 in acidic media is more practical owing to its stability and no need for further *** herein report a phosphorus and selenium tuning Co-based non-precious catalyst(CoPSe)toward two-electron oxygen reduction reaction(2e–ORR)to produce H2O2 in acidic *** starting point of using both P and Se is finding a balance between strong ORR activity of CoSe and weak activity of *** results demonstrated that the CoPSe catalyst exhibited the optimized 2e–ORR activity compared with CoP and *** disclosed an onset potential of 0.68 V and the H2O2 selectivity 76%-85%in a wide potential range(0–0.5 V).Notably,the CoPSe catalyst overcomes a significant challenge of a narrow-range selectivity for transitionmetal based 2e–ORR ***,combining with electro-Fenton reaction,an on-site system was constructed for efficient degradation of organic *** work provides a promising non-precious Co-based electrocatalyst for the electrosynthesis of H2O2 in acidic media.

关键词： Oxygen reduction reaction Electrochemical H2O2 production Electrocatalysis Non-precious electrocatalyst Acidic media

Method for C/N ratio estimation using Mask R-CNN and a depth camera for organic fraction of municipal solid wastes

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International Journal of Agricultural and Biological Engineering 2021年第5期14卷 222-229页

作者： Jingjing Huang Hongduo Zhang Xu Xiao Jingqi Huang jingxin xie Liang Zhang Heming Hu Sihui Dai Ming Li Yongwei Xu College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China Graduate School of Agricultural and Life Sciences the University of TokyoTokyo 113-0033Japan Hunan Agricultural Equipment Research Institute Changsha 410125China College of Horticulture Hunan Agricultural UniversityChangsha 410128China Center for Spatial Information Science University of TokyoKashiwa 277-8568Japan

Fast assessment of the initial carbon to nitrogen ratio(C/N)of organic fraction of municipal solid waste(OFMSW)is an important prerequisite for automatic composting control to improve efficiency and stability of the bioconversion *** this study,a novel approach was proposed to estimate the C/N of OFMSW,where an instance segmentation model was applied to predict the masks for the waste ***,by combining the instance segmentation model with the depth-camera-based volume calculation algorithm,the volumes occupied by each type of waste were obtained,therefore the C/N could be estimated based on the properties of each type of ***,an instance segmentation dataset including three common classes of OFMSW was built to train mask region-based convolutional neural networks(Mask R-CNN)***,a volume measurement algorithm was proposed,where the measurement result of the object was derived by accumulating the volumes of small rectangular cuboids whose bottom area was calculated with the projection *** the calculated volume was corrected with linear regression *** results showed that the trained instance segmentation model performed well with average precision scores AP_(50)=82.9,AP_(75)=72.5,and mask intersection over unit(Mask IoU)=45.1.A high correlation was found between the estimated C/N and the ground truth with a coefficient of determination R2=0.97 and root mean square error RMSE=*** relative average error was 0.42%and the maximum error was only 1.71%,which indicated this approach has potential for practical applications.

关键词： carbon to nitrogen ratio estimation volume measurement organic fraction of municipal solid waste depth camera instance segmentation

Occupational Mercury Exposure at a Thermometer Facility-Jiangsu Province, 2019

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China CDC weekly 2020年第42期2卷 827-831,I0001页

作者： Yanqiong Xu Xiaoling Zhang Yiliang Xin Xiaowen Liu Xing Sheng Enmin Ding jingxin xie Lei Han Hengdong Zhang Xin Liu Department of Occupational Disease Prevention and Control Jiangsu Provincial Center for Disease Control and PreventionNanjingJiangsuChina Department of Technique Service Jiangsu Provincial Center for Disease Control and PreventionNanjingJiangsuChina

Summary What is already known about this topic?Mercury is still used in the manufacture of some thermometers in *** may pose health risks if exposure is not properly prevented and *** is added by this report?An onsite investigation of a workplace at a thermometer facility in Jiangsu Province in 2019 found heavily elevated airborne and urinary mercury levels among a massive number of workers exposed to mercury.

关键词： Mercury mercury properly

DEVELOPMENT OF 50MW S-BAND KLYSTRON

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Journal of Electronics(China) 2006年第3期23卷 471-472页

作者： Wang Yong xie jingxin Ding Yaogen Liu Pukun Institute of Electronics Chinese Academy of Sciences Beijing 100080 China

This letter reports the development of a 50MW S-band klystron in the Institute of Electronics, Chinese Academy of Sciences （IECAS）. It adopted a structure of six-cavity and single output window. Under conditions of an RF （Radio Frequency） pulse width of 4t, ts, a beam voltage of 305,9kV and a beam current of 368A, the peak output power has achieved 51.4MW with an efficiency of 45.6% and a gain of 54dB.

关键词： 50MW S-band klystron High peak power Design ideas

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淤浆法制备油溶性减阻剂

石油学报（石油加工） 2014年第1期30卷 66-70页

作者：谢婧新荣峻峰王振宇李峰中国石化石油化工科学研究院北京100083

以1-辛烯为原料,采用淤浆聚合法合成了聚合物减阻剂(DRA)。考察了助催化剂种类及用量、外给电子体用量对所得减阻剂特性黏度的影响,并采用室内环道评价装置测定了所得减阻剂的减阻率。结果表明,淤浆聚合法工艺简便,聚合物产品的特性黏度... 详细信息

以1-辛烯为原料,采用淤浆聚合法合成了聚合物减阻剂(DRA)。考察了助催化剂种类及用量、外给电子体用量对所得减阻剂特性黏度的影响,并采用室内环道评价装置测定了所得减阻剂的减阻率。结果表明,淤浆聚合法工艺简便,聚合物产品的特性黏度为17.3dL/g,减阻率最高达到58.7%,与市售品相近。

关键词：淤浆聚合减阻剂(DRA) 特性黏度减阻率

城镇化发展中后期我国农村劳动力迁移年龄模式研究——基于迁移次序和队列差异视角

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人口与经济 2024年第3期 57-69页

作者：王亚楠谢晶鑫河海大学经济与金融学院江苏常州213200

随着我国城镇化发展进入中后期,农村劳动力迁移呈现增速放缓以及回流趋势,在当前农村人口总量依然庞大、农业与非农部门劳动生产率仍存在较大差距的背景下,上述变化趋势显然有悖于刘易斯二元经济理论框架下的劳动力迁移规律。基于迁移... 详细信息

随着我国城镇化发展进入中后期,农村劳动力迁移呈现增速放缓以及回流趋势,在当前农村人口总量依然庞大、农业与非农部门劳动生产率仍存在较大差距的背景下,上述变化趋势显然有悖于刘易斯二元经济理论框架下的劳动力迁移规律。基于迁移次序和队列差异视角,利用中国劳动力动态调查(CLDS)数据,采用二元选择模型和多层次APC—交叉分类随机效应模型,理论探讨并实证检验我国农村劳动力初次迁移与回流再迁移、不同出生队列劳动力初次迁移的年龄模式差异,以期深入理解劳动力迁移规律并准确研判未来发展趋势。研究发现:第一,回流劳动力的再迁移意愿显著大于从未迁移劳动力的初次迁移意愿,在20—45岁的中青年劳动力群体中体现得最为明显;第二,我国农村劳动力初次迁移行为具有典型的年龄特征且存在明显的队列差异,越晚出生队列初次迁移率与年龄倒“U”型关系越显著,尖峰态势越明显。为推动我国城镇化水平持续提升、促进城乡统一劳动力大市场形成,建议应重点围绕提升农村人口自然增长水平、加强中青年劳动力迁移稳定性以及挖掘农村中老年劳动力迁移潜力制定适应性政策。

关键词：劳动力迁移年龄模式迁移次序队列差异

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百兆瓦级高功率速调管电子光学系统的研究

真空科学与技术学报 2009年第5期29卷 499-503页

作者：张瑞王勇谢敬新李庆生中国科学院电子学研究所中国科学院高功率微波源与技术重点实验室北京100190 中国科学院研究生院北京100049

基于强流电子光学理论确定了S波段100MW速调管电子枪初始参数,对电子枪电极进行优化,获得了导流系数2.0μA.V-3/2、枪内场强低于***-1、层流性良好的电子枪。设计了均匀磁场电子注聚焦系统,通过对过渡区磁场的调整,实现了对电子注的良... 详细信息

基于强流电子光学理论确定了S波段100MW速调管电子枪初始参数,对电子枪电极进行优化,获得了导流系数2.0μA.V-3/2、枪内场强低于***-1、层流性良好的电子枪。设计了均匀磁场电子注聚焦系统,通过对过渡区磁场的调整,实现了对电子注的良好聚焦,模拟表明电子注填充因子约76%,通过率100%且波动较小。样管的热测实验结果与设计取得了良好的一致性。

关键词：高功率微波速调管电子光学电子枪