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Porous nanocomposites with enhanced intrinsic piezoresistive sensitivity for bioinspired multimodal tactile sensors

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Microsystems & Nanoengineering 2024年第1期10卷 243-256页

作者： Jianpeng Zhang Song Wei Caichao Liu chao shang Zhaoqiang He Yu Duan Zhengchun Peng State Key Laboratory of Radio Frequency Heterogeneous Integration(Shenzhen University) School of Physics and Optoelectronic EngineeringShenzhen University518060 ShenzhenGuangdong ProvinceP.R.China Linksense Technology Ltd. 518060 ShenzhenGuangdong ProvinceP.R.China

In this work,we propose porous fluororubber/thermoplastic urethane nanocomposites(PFTNs)and explore their intrinsic piezoresistive sensitivity to *** experiments reveal that the intrinsic sensitivity of the PFTN-based sensor to pressure up to 10 kPa increases up to 900%compared to the porous thermoplastic urethane nanocomposite(PTN)counterpart and up to 275%compared to the porous fluororubber nanocomposite(PFN)*** pressures exceeding 10 kPa,the resistance-pressure relationship of PFTN follows a logarithmic function,and the sensitivity is 221%and 125%higher than that of PTN and PFN,*** the excellent intrinsic sensitivity of the thick PFTN film,a single sensing unit with integrated electrode design can imitate human skin for touch detection,pressure perception and traction *** sensing range of our multimodal tactile sensor reaches~150 Pa,and it exhibits a linear fit over 97%for both normal pressure and shear *** also demonstrate that an electronic skin,made of an array of sensing units,is capable of accurately recognizing complex tactile interactions including pinch,spread,and tweak motions.

关键词： sensation intrinsic modal

A Cloud-Fog Enabled and Privacy-Preserving IoT Data Market Platform Based on Blockchain

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 2237-2260页

作者： Yurong Luo Wei You chao shang Xiongpeng Ren Jin Cao Hui Li School of Cyber Engineering State Key Laboratory of Integrated Service NetworkXidian UniversityXi’an710126China

The dynamic landscape of the Internet of Things(IoT)is set to revolutionize the pace of interaction among entities,ushering in a proliferation of applications characterized by heightened quality and *** the pivotal applications within the realm of IoT,as a significant example,the Smart Grid(SG)evolves into intricate networks of energy deployment marked by data *** evolution concurrently entails data interchange with other IoT ***,there are also several challenges including data-sharing overheads and the intricate establishment of trusted centers in the IoT *** this paper,we introduce a hierarchical secure data-sharing platform empowered by cloud-fog ***,we propose a novel non-interactive zero-knowledge proof-based group authentication and key agreement protocol that supports one-to-many sharing sets of IoT data,especially SG *** security formal verification tool shows that the proposed scheme can achieve mutual authentication and secure data sharing while protecting the privacy of data *** with previous IoT data sharing schemes,the proposed scheme has advantages in both computational and transmission efficiency,and has more superiority with the increasing volume of shared data or increasing number of participants.

关键词： IoT data sharing zero-knowledge proof authentication privacy preserving blockchain

Introducing electrolytic electrochemical polymerization for constructing protective layers on Ni-rich cathodes of Li-ion batteries

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Rare Metals 2024年第6期43卷 2536-2545页

作者： Lin-Tao Dou Bei Li Hao-Long Nie Dong-Dong Xiao chao-Qun shang Xiao-Min Wang Zhan-Hui Zhang Katerina E.Aifantis Pu Hu School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101400China Department of Mechanical and Aerospace Engineering University of FloridaGainesvilleFL 32603USA

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is the most promising cathode for high-energy Li-ion batteries,despite its poor cycling stability that originates from the reactions that occur with the ***,to solve this interfacial issue,a facile electrolytic electrochemical polymerization process was introduced in this paper,and a uniform conductive electrolyte interface(polyaniline)was successfully constructed on the surface of the NCM811 porous electrode(PANI-NCM),which facilitated the charge transfer during charge/*** side reactions at the interface between the cathode and the electrolyte are suppressed,and thereby,the cycling performance and rate capability are considerably ***-NCM delivers an initial capacity of 157.2 mAh·g^(-1)as well as excellent cyclability(capacity retention of 88%after 500 cycles at 2C),whereas the capacity of the bare NCM811 has dropped to 31.3 mAh·g^(-1).In addition,polypyrrole and polythiophene also can be formed through electrolytic electrochemical polymerization process,which provides a practicable tactic to modify the interfacial stability of cathodes for high-energy Li-ion batteries.

关键词： Lithium-ion battery Ni-rich cathode In-situ polymerization Conductive polymer Electrochemical performance

Research and Application of Recycled Concrete Technology in Prefabricated Buildings

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Research and Application of Materials Science 2024年第1期6卷 33-36页

作者： Shanshan DENG Gang SHI chao shang Fuchuan ZHOU Masabo Gasper Masiko M.Kaziana Chongqing Telecommunication Polytechnic College Chongqing402247China Chongqing yuxi water conservancy and electric power survey and design institute CO. LTD.Chongqing402160China Chengde Thermal Power Engineering Installation Co. Ltd.Chengde067000China Chongqing Vocational Institute of Engineering Chongqing402260China Undergraduate Architecture and Civil Engineering Dar es Salaam Institute of Technology{DIT}Dar es Salaam11103Tanzania

The utilization of waste concrete as a raw material for recycled concrete in the domain of prefabricated components is garnering greater *** paper delineates and examines the concept,categorization,methodologies of preparation,applicable sectors,and evaluative metrics of recycled concrete technology,highlighting its prospective ***,for the successful integration of recycled concrete technology into prefabricated component applications,it is imperative to systematically enhance its physical,mechanical,and attributes,as well as its environmental ***,to foster the continued advancement of recycled concrete technology,innovative initiatives,standardization,educational programs,demonstration projects,and collaborative efforts are crucial to promote broader adoption and realize improved outcomes within the realm of prefabricated *** conclusion,recycled concrete technology is poised to play a pivotal role in prefabricated construction,offering robust support for propelling the construction industry towards a sustainable future.

关键词： recycled concrete prefabricated buildings Environmental performance assessment

HPLC法同时测定复方双花片中10个成分的含量

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药物分析杂志 2024年第2期44卷 242-248页

作者：尚朝利白泽方樊轻亚信阳职业技术学院信阳464000

目的:采用高效液相色谱(HPLC)技术,建立同时测定复方双花片中新绿原酸、绿原酸、隐绿原酸、连翘酯苷A、3,4-二-O-咖啡酰奎宁酸、3,5-二-O-咖啡酰奎宁酸、4,5-二-O-咖啡酰奎宁酸、连翘苷、穿心莲内酯和脱水穿心莲内酯10个成分含量的方法... 详细信息

目的:采用高效液相色谱(HPLC)技术,建立同时测定复方双花片中新绿原酸、绿原酸、隐绿原酸、连翘酯苷A、3,4-二-O-咖啡酰奎宁酸、3,5-二-O-咖啡酰奎宁酸、4,5-二-O-咖啡酰奎宁酸、连翘苷、穿心莲内酯和脱水穿心莲内酯10个成分含量的方法。方法:复方双花片样品用50%甲醇水超声提取,采用Agilent Zorbax SB-C_(18)(250 mm×4.6 mm,5μm)色谱柱分析,流动相为乙腈-0.15%磷酸水溶液,梯度洗脱,流速1.0 mL·min^(-1),柱温30℃,进样量10μL,检测波长327 nm(检测新绿原酸、绿原酸、隐绿原酸、连翘酯苷A、3,4-二-O-咖啡酰奎宁酸、3,5-二-O-咖啡酰奎宁酸、4,5-二-O-咖啡酰奎宁酸)和226 nm(检测连翘苷、穿心莲内酯、脱水穿心莲内酯)。结果:新绿原酸、绿原酸、隐绿原酸、连翘酯苷A、3,4-二-O-咖啡酰奎宁酸、3,5-二-O-咖啡酰奎宁酸、4,5-二-O-咖啡酰奎宁酸、连翘苷、穿心莲内酯和脱水穿心莲内酯质量浓度分别在4.071~40.71μg·mL^(-1)(r=0.9999)、20.16~201.6μg·mL^(-1)(r=0.9999)、4.730~47.30μg·mL^(-1)(r=0.9999)、4.536~45.36μg·mL^(-1)(r=0.9998)、1.817~18.17μg·mL^(-1)(r=0.9999)、2.266~22.66μg·mL^(-1)(r=0.9997)、3.321~33.21μg·mL^(-1)(r=0.9999)、3.462~34.62μg·mL^(-1)(r=0.9996)、2.111~21.11μg·mL^(-1)(r=0.9999)和2.290~22.90μg·mL^(-1)(r=0.9997)与峰面积呈良好的线性关系;平均回收率(RSD)(n=6)分别为101.3%(2.1%)、103.0%(1.5%)、100.9%(2.0%)、101.1%(2.0%)、98.4%(1.6%)、102.2%(2.4%)、98.2%(1.3%)、97.8%(2.0%)、99.0%(2.0%)和96.4%(1.1%);4批样品中上述10个成分的含量分别为1.685~2.649 mg·g^(-1)、12.202~13.780 mg·g^(-1)、2.415~2.594 mg·g^(-1)、1.340~1.919 mg·g^(-1)、0.501~0.791 mg·g^(-1)、0.891~1.342 mg·g^(-1)、1.299~2.105 mg·g^(-1)、1.147~1.504 mg·g^(-1)、0.654~0.694 mg·g^(-1)、0.846~1.151 mg·g^(-1)。结论:所建立的方法简单准确,可用于复方双花片的质量控制与评价。

关键词：复方双花片高效液相色谱化学成分含量测定质量控制

饲用桑叶多糖提取工艺优化及其体外抗菌活性研究

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饲料研究 2024年第5期47卷 72-75页

作者：尚朝利白泽方樊轻亚信阳职业技术学院河南信阳464000

试验以饲用桑叶为原料,采用热水浸提法提取多糖。以提高桑叶中多糖提取率为优化目标,采用单因素试验分别研究液料比、提取温度和提取时间对多糖提取率的影响,利用正交分析法优化桑叶多糖提取工艺参数组合,并利用牛津杯法检测桑叶多糖的... 详细信息

试验以饲用桑叶为原料,采用热水浸提法提取多糖。以提高桑叶中多糖提取率为优化目标,采用单因素试验分别研究液料比、提取温度和提取时间对多糖提取率的影响,利用正交分析法优化桑叶多糖提取工艺参数组合,并利用牛津杯法检测桑叶多糖的体外抑菌活性。结果显示,各因素对桑叶多糖提取率的影响排序为提取温度>液料比>提取时间,最优生产工艺参数组合为液料比30 L/g、提取温度90℃、提取时间3 h。在最优工艺条件下,桑叶多糖提取率为6.69%。桑叶多糖对金黄色葡萄球菌和大肠杆菌具有明显的抑制作用,抑菌圈直径分别为9.22、11.74 mm,最低抑菌浓度均为2.0 g/L。研究表明,热水浸提法提取的桑叶多糖可作为功能性饲料添加剂应用于动物养殖。

关键词：饲用桑叶多糖热水浸提法抑菌活性

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大柱距预应力无梁楼盖在多高层冷库中的应用

科学技术创新 2024年第7期 120-123页

作者：王涛尚超徐小龙北京银泰建构科技股份有限公司北京

随着我国冷链物流快速发展,为满足提高冷库库容量及方便库体机械化操作等需求,大柱距预应力无梁楼盖相对传统梁板楼盖,因其综合技术指标优异,结构性能高等特点,在多高层冷库中得到广泛认可和运用。本文选取冷库项目实例,开展结构楼盖设... 详细信息

随着我国冷链物流快速发展,为满足提高冷库库容量及方便库体机械化操作等需求,大柱距预应力无梁楼盖相对传统梁板楼盖,因其综合技术指标优异,结构性能高等特点,在多高层冷库中得到广泛认可和运用。本文选取冷库项目实例,开展结构楼盖设计方案比选,分析比选方案的优缺点,并借助有限分析方法,阐述预应力无梁楼盖设计要点,旨在为冷库设计提供借鉴和参考。

关键词：冷库大柱距预应力无梁楼盖

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管式旋流气液分离器流场特性与分离性能研究

过程工程学报 2024年第7期24卷 772-782页

作者：张明孙欢王强强陈家庆尚超李想王春升孔令真中海油研究总院有限责任公司工程研究设计院北京100027 北京石油化工学院机械工程学院北京102617 深水油气管线关键技术与装备北京市重点实验室北京102617 西南石油大学石油与天然气工程学院四川成都610500

管式旋流气液分离器因具有分离效率高、结构紧凑等优点而受到广泛关注,但能否适应入口气含率大范围变化是制约其实用性的关键。本工作考察了能够适应气含率大范围变化的管式旋流气液分离器,采用计算流体力学(CFD),结合空气-水介质体系... 详细信息

管式旋流气液分离器因具有分离效率高、结构紧凑等优点而受到广泛关注,但能否适应入口气含率大范围变化是制约其实用性的关键。本工作考察了能够适应气含率大范围变化的管式旋流气液分离器,采用计算流体力学(CFD),结合空气-水介质体系下的实验测试,对其流场特性和分离性能进行研究。CFD数值模拟结果显示,入口气含率在10%~90%范围内变化时,气相分离效率均大于80%且变化幅值小于9.9%,液相分离效率均大于97%且变化幅值小于2.2%。实验测试结果显示,入口气含率在9.4%~89.2%范围内变化时,随入口气含率增加,气相出口的含液率逐渐减小而液相出口的气含率逐渐增加,气相出口的含液率均小于4%,除液体流量为12 m^(3)/h的工况外,其他工况下液相出口气含率始终小于10%。对比不同液体流量下的气相分离效率和液相分离效率,液体流量为8 m^(3)/h时分离性能最佳。CFD数值模拟结果与实验测试结果略有差异,但整体变化趋势一致,可作为结构放大设计的有效手段。研究结果表明,管式旋流气液分离器整体采用“强旋流+弱旋流+重力”的作用形式,具有较高的分离效率和良好的抗工况波动性能。

关键词：气液分离管式旋流数值模拟实验测试流场特性分离效率

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基于FDD模型的掘进机截割减速器油液状态评估研究

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煤炭工程 2024年第5期56卷 152-159页

作者：秦彦凯尚超权钰云关重阳刘国鹏石冠男清华大学自动化系北京100084 中国煤炭科工集团太原研究院有限公司山西太原030006 山西天地煤机装备有限公司山西太原030006 太原理工大学机械与运载工程学院山西太原030024 太原科技大学电子信息工程学院山西太原030024

掘进机截割减速器的可靠运行与润滑油状态息息相关,为合理评估油液状态,依据粘度、水分、颗粒数三种油液指标,提出了一种基于模糊深度学习模型(FDD)的油液状态评估方法。首先,按照单个指标将油液状态划分为四个等级,根据模糊综合评估法... 详细信息

掘进机截割减速器的可靠运行与润滑油状态息息相关,为合理评估油液状态,依据粘度、水分、颗粒数三种油液指标,提出了一种基于模糊深度学习模型(FDD)的油液状态评估方法。首先,按照单个指标将油液状态划分为四个等级,根据模糊综合评估法进行模糊评估;其次,将各指标数据进行归一化处理,作为深度神经网络的输入,再运用ReLU激活函数对网络进行激活,得到一个过拟合的神经网络;然后利用Dropout层特性,降低网络拟合程度,同时使用遗传算法对模型中的超参进行优化。最后,使用仿真数据对模型进行训练,并利用实际数据对模型进行验证。结果表明,该方法对油液状态的平均预测精度达到97%,数据损失0.0018,解决了由于多指标信息不一致导致油液状态表征困难及数据较少情况下神经网络训练困难的问题。

关键词：油液监测截割减速器 FDD模型模糊评估遗传算法深度学习