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Aφ6-m Tunnel Boring Machine Steel Arch Splicing Manipulator

Chinese Journal of Mechanical Engineering 2022年第2期35卷 121-134页

作者： Yuanfu He Yimin Xia zhen xu Jie Yao Bo Ning xuemeng Xiao College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China China Railway Construction Heavy Industry Co.Ltd. Changsha 410100China China Railway Siyuan Survey and Design Group Co.Ltd. Wuhan 430063China National-Local Joint Engineering Research Center of Underwater Tunnelling Technology Wuhan 430063China

Robotic splicing of steel arches is a challenging task that is necessary to realize the grasping and docking of steel arches in a limited *** arches often have a mass of more than 200 kg and length of more than 4 *** to the large volume and mass of steel arches and the high requirements for accurately positioning the splicing,it is difficult for a general manipulator to meet the stiffness *** enhance the structural stiffness of the steel arch splicing manipulator,a single-degree-of-freedom(DOF)closed-loop mechanism was added to the grasping structure of the *** on the basic principle of structural synthesis,a solution model of the single-DOF closed-loop mechanism was developed,and alternative kinematic pairs of the mechanism with different input constraints and output requirements were *** on this model,a design method for a single-DOF closed-loop grasping mechanism and a posture adjustment mechanism for a steel arch was *** with the same dimensional subspace equivalence principle of the graphical-type synthesis method,12 types of steel arch splicing manipulator were *** analyzing the motion/force transmission and structural complexity of the steel arch splicing manipulators,the best scheme was selected.A prototype of the steel arch splicing manipulator was *** software was used to obtain clearly the output trajectory of the end of the *** relative spatial positions of the upper and lower jaws under different working stages were analyzed,demonstrating that the manipulator satisfied the grasping *** a steel arch splicing experiment,the grasping effect,docking accuracy,and splicing efficiency of the manipulator met the design *** steel arch splicing manipulator can replace the manual completion of the steel arch splicing operation,significantly improving the operation efficiency.

关键词： Steel arch splicing manipulator Single-DOF closed-loop mechanism Screw theory Graphical-type synthesis method Mechanism design

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2021-2022年昆明市儿童医院预防接种咨询门诊特殊健康状态儿童预防接种服务分析

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中国疫苗和免疫 2024年第2期30卷 212-218页

作者：宋玉孙晶晶凌昱刘四香许榛张欧罗丽丝昆明市儿童医院云南昆明650000

目的分析特殊健康状态儿童预防接种服务。方法选择2021年7月-2022年12月昆明市儿童医院预防接种咨询门诊就诊的特殊健康状态儿童,收集医学评估后疫苗接种建议和接种信息,分析疾病分布特征、接种建议比例和接种后不良反应发生率。结果共... 详细信息

目的分析特殊健康状态儿童预防接种服务。方法选择2021年7月-2022年12月昆明市儿童医院预防接种咨询门诊就诊的特殊健康状态儿童,收集医学评估后疫苗接种建议和接种信息,分析疾病分布特征、接种建议比例和接种后不良反应发生率。结果共纳入848例特殊健康状态儿童,其中1-6月龄、7-11月龄、1-2岁、3-12岁分别占40.56%、13.21%,20.52%、25.71%;神经系统疾病、新生儿疾病、心血管系统疾病患儿分别占32.19%(273例)、31.37%(266例)、13.21%(112例);经过医学评估,建议正常接种、正常接种但每次接种1剂次、接种灭活疫苗、接种灭活疫苗但每次接种1剂次、暂缓接种所有疫苗的患儿分别占48.94%(415例)、23.82%(202例)、9.43%(80例)、8.25%(70例)、9.55%(81例)。患儿疫苗接种后不良反应发生率为2.75%(20/727),均为轻度不良反应。结论大部分特殊健康状态儿童经医学评估后可实施疫苗接种,预防接种咨询门诊可为该人群提供良好的个性化预防接种服务。

关键词：预防接种医学评估接种建议不良反应特殊健康状态儿童

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5G时代基于FISCO BCOS联盟链版权保护系统的研究

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天津中德应用技术大学学报 2024年第3期 84-90页

作者：谢淑丽徐镇辉刘文华漳州职业技术学院电子信息学院福建漳州363000

5G时代数字版权保护面临更加复杂的挑战,区块链技术中联盟链不仅符合我国监管实际,也契合版权保护的技术要求,可以较好解决确权难、授权难、维权难等问题。基于FISCO BCOS联盟链的版权保护应用系统,按照应用层、服务层、核心链层、数据... 详细信息

5G时代数字版权保护面临更加复杂的挑战,区块链技术中联盟链不仅符合我国监管实际,也契合版权保护的技术要求,可以较好解决确权难、授权难、维权难等问题。基于FISCO BCOS联盟链的版权保护应用系统,按照应用层、服务层、核心链层、数据存储层架构,用solidity编写智能合约,采用前后端分离开发方式以及IPFS与区块链相结合的链上链下协同存储方式,实现版权注册、查询和可信交易,有利于缓解链上存储压力,增强系统安全,提高数字版权保护水平。

关键词：区块链联盟链 FISCO BCOS 版权保护

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Distributed Active Partial Label Learning

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Intelligent Automation & Soft Computing 2023年第9期37卷 2627-2650页

作者： zhen xu Weibin Chen Key Laboratory of Intelligent Informatics for Safety&Emergency of Zhejiang Province Wenzhou UniversityWenzhou325006China College of Computer Science and Artificial Intelligence Engineering Wenzhou UniversityWenzhou325006China

Active learning(AL)trains a high-precision predictor model from small numbers of labeled data by iteratively annotating the most valuable data sample from an unlabeled data pool with a class label throughout the learning ***,most current AL methods start with the premise that the labels queried at AL rounds must be free of ambiguity,which may be unrealistic in some real-world applications where only a set of candidate labels can be obtained for selected ***,most of the existing AL algorithms only consider the case of centralized processing,which necessitates gathering together all the unlabeled data in one fusion center for *** that data are collected/stored at different nodes over a network in many real-world scenarios,distributed processing is chosen *** this paper,the issue of distributed classification of partially labeled(PL)data obtained by a fully decentralized AL method is focused on,and a distributed active partial label learning(dAPLL)algorithm is *** proposed algorithm is composed of a fully decentralized sample selection strategy and a distributed partial label learning(PLL)*** the sample selection process,both the uncertainty and representativeness of the data are measured based on the global cluster centers obtained by a distributed clustering method,and the valuable samples are chosen in ***,using the disambiguation-free strategy,a series of binary classification problems can be constructed,and the corresponding cost-sensitive classifiers can be cooperatively trained in a distributed *** experiment results conducted on several datasets demonstrate that the performance of the dAPLL algorithm is comparable to that of the corresponding centralized method and is superior to the existing active PLL(APLL)method in different parameter ***,our proposed algorithm outperforms several current PLL methods using the random selection strategy,especially when only s

关键词： Active learning partial label learning distributed processing disambiguation-free strategy

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基于高分子增透剂的煤层注水增渗作用分析

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能源与环保 2024年第5期46卷 84-90页

作者：詹召伟葛俊岭徐振刘涛济宁矿业集团有限公司霄云煤矿山东济宁272213 济宁市能源局山东济宁272213 中煤科工集团重庆研究院有限公司重庆400037

为提高煤体润湿性与注水渗透效果,以自行制备的天然高分子增透剂为基础,从增透剂的反应过程、分子结构微晶结构及其与煤的表面形貌作用效果和润湿作用机理出发,研究了天然高分子增透剂对煤的增渗作用机理,同时利用分子动力学模拟研究了... 详细信息

为提高煤体润湿性与注水渗透效果,以自行制备的天然高分子增透剂为基础,从增透剂的反应过程、分子结构微晶结构及其与煤的表面形貌作用效果和润湿作用机理出发,研究了天然高分子增透剂对煤的增渗作用机理,同时利用分子动力学模拟研究了增透剂与煤粉之间的微观作用机理。研究结果表明,添加高分子增透剂后,水对于煤的润湿能力大幅度提升,在相同时间内添加高分子增透剂的试验组呈现出最佳的渗透效果;分子动力学模拟得到增透剂—煤体系的相互作用强度为-232.19 eV,而水—煤体系的相互作用强度为-34.60 eV,表明添加增透剂的溶液体系中水分子更容易附着在煤分子表面上,分子间相互作用力增强,会使附着在煤表面的分子结构更加稳定,更有利于煤表面的润湿。研究结果为煤层注水增透剂的研发和应用提供了参考依据,有助于进一步提高煤层注水抑尘效果。

关键词：煤层注水增透剂分子改性增渗机理润湿性

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融合VMD-MPC算法的多微电网能量调度技术优化

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粘接 2024年第4期51卷 189-192页

作者：徐振关亚飞任靖玮马骁兵国网安徽省电力有限公司淮北供电公司安徽淮北235000

针对配电侧多微电网能量调度分析能力滞后,能量调度差的问题,研究融合变分模态分解(VMD)和模型预测控制(MPC),构建VMD和MPC相结合的、多时间尺度滚动优化兼具反馈矫正的多微电网能量调度系统优化调控模型,建立了调度自动化一体化多微电... 详细信息

针对配电侧多微电网能量调度分析能力滞后,能量调度差的问题,研究融合变分模态分解(VMD)和模型预测控制(MPC),构建VMD和MPC相结合的、多时间尺度滚动优化兼具反馈矫正的多微电网能量调度系统优化调控模型,建立了调度自动化一体化多微电网能量调度系统,通过对配电侧多微电网能量采集、调度和分析,提高了能量调度能力。实验结果表明,调度准确率最高为98.3%,识别到正确样本个数最大为4 785,有利于促进配电侧安全、微电网可靠经济运行和电厂的经济效益。

关键词：能量调度变分模态分解配电侧微电网模型预测控制

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Enhanced recovery after surgery strategy to shorten perioperative fasting in children undergoing non-gastrointestinal surgery:A prospective study

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World Journal of Clinical Cases 2022年第16期10卷 5287-5296页

作者： Yan Ying Hong-zhen xu Meng-Lan Han Department of General Surgery Children's Hospital of Zhejiang University School of MedicineHangzhou 310052Zhejiang ProvinceChina

BACKGROUND Enhanced recovery after surgery strategies are increasingly implemented to improve the management of surgical *** To evaluate the effects of new perioperative fasting protocols in children≥3 mo of age undergoing non-gastrointestinal *** This prospective pilot study included children≥3 mo of age undergoing nongastrointestinal surgery at the Children’s Hospital(Zhejiang University School of Medicine)from January 2020 to June *** children were divided into either a conventional group or an ERAS group according to whether they had been enrolled before or after the implementation of the new perioperative fasting *** children in the conventional group were fasted using conventional strategies,while those in the ERAS group were given individualized fasting protocols preoperatively(6-h fasting for infant formula/non-human milk/solids,4-h fasting for breast milk,and clear fluids allowed within 2 h of surgery)and postoperatively(food permitted from 1 h after surgery).Pre-operative and postoperative fasting times,pre-operative blood glucose,the incidence of postoperative thirst and hunger,the incidence of perioperative vomiting and aspiration,and the degree of satisfaction were *** The study included 303 patients(151 in the conventional group and 152 in the ERAS group).Compared with the conventional group,the ERAS group had a shorter pre-operative food fasting time[11.92(4.00,19.33)vs 13.00(6.00,20.28)h,P<0.001],shorter preoperative liquid fasting time[3.00(2.00,7.50)vs 12.00(3.00,20.28)h,P<0.001],higher preoperative blood glucose level[5.6(4.2,8.2)vs 5.1(4.0,7.4)mmol/L,P<0.001],lower incidence of thirst(74.5%vs 15.3%,P<0.001),shorter time to postoperative feeding[1.17(0.33,6.83)vs 6.00(5.40,9.20),P<0.001],and greater satisfaction[7(0,10)vs 8(5,10),P<0.001].No children experienced perioperative *** incidences of hunger,perioperative vomiting,and fever were not significantly different between the two groups.

关键词： Enhanced recovery after surgery Fasting Water deprivation Pre-operative period Postoperative period Intraoperative complications Postoperative complications

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Localization of Mobile Robot Aided for Large-Scale Construction Based on Optimized Artificial Landmark Map in Ongoing Scene

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1853-1882页

作者： zhen xu Shuai Guo Tao Song Yuwen Li Lingdong Zeng Shanghai Key Laboratory of IntelligentManufacturing and Robotics School of Mechatronic Engineering and AutomationShanghai UniversityShanghai200444China National Demonstration Center for Experimental Engineering Training Education Shanghai UniversityShanghai200444China

The effectiveness of mobile robot aided for architectural construction depends strongly on its accurate localization *** of mobile robot is increasingly important for the printing of buildings in the construction *** many available studies on the localization have been conducted,only a few studies have addressed the more challenging problem of localization for mobile robot in large-scale ongoing and featureless *** realize the accurate localization of mobile robot in designated stations,we build an artificial landmark map and propose a novel nonlinear optimization algorithm based on graphs to reduce the uncertainty of the whole ***,the performances of localization for mobile robot based on the original and optimized map are compared and ***,experimental results show that the average absolute localization errors that adopted the proposed algorithm is reduced by about 21%compared to that of the original map.

关键词： Large-scale construction artificial landmark map localization mobile robot non-linear optimization

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Specialized Microglia Resolve Neuropathic Pain in the Spinal Cord

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Neuroscience Bulletin 2023年第1期39卷 173-175页

作者： Jing Yang Shulan Xie Shengmei Zhu zhen-Zhong xu Department of Anesthesiology and Department of Neurobiology of the First Affiliated Hospital Zhejiang University School of MedicineHangzhou310058China NHC and CAMS Key Laboratory of Medical Neurobiology MOE Frontier Science Center for Brain Research and Brain–Machine IntegrationSchool of Brain Science and Brain MedicineZhejiang UniversityHangzhou310058China

Neuropathic pain is a major health problem affecting up to 10%of the general population,resulting from a lesion or dysfunction of the somatosensory nervous system,including peripheral nerve injury(PNI)^([1]).However,neuropathic pain is difficult to treat because of its obscure *** types of neuropathic pain have been modelled in rodents to study its underlying mechanisms and identify novel therapeutic targets.

关键词： pain mechanisms Spinal

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熔盐电解法制备镨钕金属氟化钡部分替代氟化锂对电解生产影响研究

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世界有色金属 2024年第3期 14-16页

作者：李虎平朱珍旭孙伟袁敦李明臻甘肃稀土新材料股份有限公司甘肃白银730922

随着氟化锂价格逐渐攀升,针对熔盐电解生产镨钕金属氟化锂单耗偏高的现象,氟化锂替代或部分替代研究实验再次被提出来,寻求氟化锂替代或部分替代品已经成为稀土熔盐电解行业亟需解决的工作任务之一,因此,进行氟化钡部分替代氟化锂对电... 详细信息

随着氟化锂价格逐渐攀升,针对熔盐电解生产镨钕金属氟化锂单耗偏高的现象,氟化锂替代或部分替代研究实验再次被提出来,寻求氟化锂替代或部分替代品已经成为稀土熔盐电解行业亟需解决的工作任务之一,因此,进行氟化钡部分替代氟化锂对电解生产的影响研究。研究表明:采用氟化钡对氟化锂进行部分替代,在一定程度上可以降低电解生产过程中氟化锂的消耗,氟化钡替代比为10%~15%时,对金属的质量、产量、一次合格率均影响较小,氟化钡替代比超过15%,其会影响金属的正常电解,造成产量、质量的波动。

关键词：电解质体系氟化钡氟化锂熔盐电解

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