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Micro-sized nanoaggregates:Spray-drying-assisted fabrication and applications

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Particuology 2024年第2期85卷 22-48页

作者： dan-lei Yang Rong-Kun Liu Yan Wei Qian Sun Jie-Xin Wang School of Life Sciences and Chemical Engineering Jiangsu Second Normal UniversityNanjing210013China State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing100029China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning530004China

The applications of nanoparticles suffer from their extremely small size and intrinsic trend of *** nanoparticles to form micro-sized nanoaggregates(MNAs)with increased size,ordered structure,as well as controllable size,shape,and morphology is a crucial step in various fields of science and technology to maintain the unique characteristics of nanoparticles while obtaining greatly enhanced or new performance at the *** structure of MNAs prominently affects their functionality,which is determined by the arrangement of nanoparticles and the interaction between primary *** methods have been proposed to prepare the MNAs,in which spray-drying technology stands out considering the feasibility,scalability for industry,cost,and *** assembly of nanoparticles through spray-drying under tunable process parameters yields diverse physical properties and structural arrangements of nanoparticles of the MNAs,they therefore exhibit enormous potential in a wide range of application *** review presents the construction and applications of spray-dried *** factors that influence the size,morphology,and structure of the MNAs are discussed in *** addition,the outstanding application performance resulting from the tightly packed nanoparticles in regular-shaped MNAs obtained by the spray-drying process is illustrated.

关键词： Spray-drying Micro-sized nanoaggregates Applications

Improvement of the piezoelectricity of PVDF-HFP by CoFe_(2)O_(4)nanoparticles

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Nano Materials Science 2024年第2期6卷 201-210页

作者： dan lei Ning Hu Liangke Wu Alamusi Huiming Ning Yang Wang Zhaonan Jin Yaolu Liu College of Aerospace Engineering Chongqing UniversityChongqing400044China State Key Laboratory of Reliability and Intelligence Electrical Equipment School of Mechanical EngineeringHebei University of TechnologyTianjin300401China

High piezoelectric composite films composed of poly(vinylidene fluoride-co-hexafluoropropylene)(PVDF-HFP)and ferromagnetic cobalt ferrite(CoFe_(2)O_(4))(0.00 wt%to 0.2 wt%)are prepared by a solution casting method accompanied by uniaxial stretching and high electric field *** decisive effect of the poling electric field on the power generating capability was confirmed by the *** pure PVDF-HFP films,when the maximum electric field Emax is 120 MV/m,the calibrated open circuit voltage reaches 2.93 V,which is much higher than those poled at lower electric fields(70 MV/m:1.41 V;90 MV/m:2.11 V).Furthermore,the addition of CoFe_(2)O_(4)also influences the piezoelectricity *** the samples containing 0.15 wt%CoFe_(2)O_(4),the calibrated open circuit voltage increases to the maximum value of 3.57 ***,the relative fraction of theβ-phase and the crystallinity degree are 99%and 48%,*** effects of CoFe_(2)O_(4)nanoparticles on initial crystallization,uniaxial stretching and high electric field poling are investigated by XRD,FTIR and DSC.

关键词： PVDF-HFP CoFe_(2)O_(4)nanoparticles Piezoelectricity Nanocomposite

Dynamic multifunctional metasurfaces:an inverse design deep learning approach

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Photonics Research 2024年第1期12卷 123-133页

作者： ZHI-dan lei YI-DUO XU CHENG lei YAN ZHAO DU WANG The Institute of Technological Sciences Wuhan UniversityWuhan 430072China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

Optical metasurfaces(OMs)offer unprecedented control over electromagnetic waves,enabling advanced optical *** emergence of deep learning has opened new avenues for designing ***,existing deep learning methods for OMs primarily focus on forward design,which limits their design capabilities,lacks global optimization,and relies on prior ***,most OMs are static,with fixed functionalities once *** overcome these limitations,we propose an inverse design deep learning method for dynamic *** approach comprises a forward prediction network and an inverse retrieval *** forward prediction network establishes a mapping between meta-unit structure parameters and reflectance *** inverse retrieval network generates a library of meta-unit structure parameters based on target requirements,enabling end-to-end design of *** incorporating the dynamic tunability of the phase change material Sb2Te3with inverse design deep learning,we achieve the design and verification of dynamic multifunctional *** results demonstrate OMs with multiple information channels and encryption capabilities that can realize multiple physical field optical modulation *** Sb2Te3is in the amorphous state,near-field nano-printing based on meta-unit amplitude modulation is achieved for X-polarized incident light,while holographic imaging based on meta-unit phase modulation is realized for circularly polarized *** the crystalline state,the encrypted information remains secure even with the correct polarization input,achieving double *** research points towards ultra-compact,high-capacity,and highly secure information storage approaches.

关键词： polarization inverse approach

Carbon-coated hybrid crystals with fast electrochemical reaction kinetics for ultra-stable and high-load sodium-ion batteries

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Rare Metals 2024年第2期43卷 647-657页

作者： Chuan Ou Ming-Dong Tan Zhen-Bang Li Zhao-Jie Li Fei Tian Zheng-Ping Qiao dan-Ni lei Cheng-Xin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou510275China

Owing to its high theoretical capacity and low cost,Sn has attracted significant attention in sodium-ion ***,the slow kinetics of electrochemical reactions and the rapid decay of capacity resulting from drastic changes in the volume of Sn,as well as persistent side reactions between Sn and the organic electrolyte during the(de)sodium process,have limited its *** improve the electrochemical performance of Sn-based materials,the bottom-up method is normally used to prepare carbon-coated ***,its complex preparation processes and harsh conditions make it unsuitable for practical ***,a carbon-coated hybrid crystal composite(Sn/SnO_(x)@C)was prepared using an up-bottom method with commercial Sn/SnO *** effects accelerate the electrochemical kinetics and inhibit the coarsening of Sn *** Sn/SnO_(x)@C composite electrode exhibited capacity retention of 80.7%even after approximately 1000 cycles(360.4 mAh·g^(−1)) at a current density of 1 A·g^(−1).The high-load Na_(3)V_(2)(PO4)3||Sn/SnO_(x)@C full cell presents a capacity retention rate of 91.7%after 150 cycles at the current density of 0.5 A·g^(−1).This work may significantly accelerate the commercialization of the Sn/SnO_(x)@C composite in sodium-ion batteries with high energy density.

关键词： Sodium-ion batteries(SIBs) Sn-based anode Ultraviolet curing Up-bottom method

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全喂入玉米联合收获机电气控制系统的设计

农机化研究 2024年第12期46卷 118-121,126页

作者：雷丹郑璇武昌首义学院武汉430064

针对人工收割玉米劳动成本较高、收获效率低、茎秆焚烧造成环境污染且籽粒收获还需要对玉米进行二次加工等问题,对全喂入玉米联合收获机进行了设计,并重点对电气控制系统进行了研究。为了实现玉米联合收获机的智能化控制,对其自动对行... 详细信息

针对人工收割玉米劳动成本较高、收获效率低、茎秆焚烧造成环境污染且籽粒收获还需要对玉米进行二次加工等问题,对全喂入玉米联合收获机进行了设计,并重点对电气控制系统进行了研究。为了实现玉米联合收获机的智能化控制,对其自动对行和割台高度自动调控装置进行了设计。其中,自动对行装置采用Labview平台进行设计,割台高度采用PID控制器进行控制。为了验证该玉米联合收获机的性能,对其电气系统进行了玉米自动对行试验和割台高度自动调控试验。结果表明:玉米联合收获机可实现自动对行和割台高度自动调控。

关键词：全喂入玉米联合收获机电气控制自动对行割台高度自动调控 LabView

荷载β-胡萝卜素OSA马铃薯糊精的稳定性研究

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粮食与油脂 2024年第5期37卷 12-16,32页

作者：陈超雷丹丹王梅董楠贵州省农业科学院贵州省农业生物技术重点实验室贵州贵阳550025 贵州省农业科学院食品加工研究所贵州贵阳550025

以辛烯基琥珀酸马铃薯糊精(OSA-pd)为荷载载体,利用其自组装特性,针对脂溶性营养成分β-胡萝卜素构建纳米包埋体系。以β-胡萝卜素保留率和胶束粒径为指标,对荷载β-胡萝卜素OSA-pd的加工稳定性和体外胃肠液稳定性进行研究。结果表明:... 详细信息

以辛烯基琥珀酸马铃薯糊精(OSA-pd)为荷载载体,利用其自组装特性,针对脂溶性营养成分β-胡萝卜素构建纳米包埋体系。以β-胡萝卜素保留率和胶束粒径为指标,对荷载β-胡萝卜素OSA-pd的加工稳定性和体外胃肠液稳定性进行研究。结果表明:冻融处理会增大OSA-pd胶束的粒径和多分散性指数(PDI),降低β-胡萝卜素保留率;热处理OSA-pd胶束的粒径和PDI变化不明显,表现出良好的胶束热稳定性;随着储藏时间的延长和温度的升高,OSA-pd胶束的粒径和保留率总体降低,PDI总体增大,表明胶束储藏稳定性一般。体外模拟胃肠液稳定性试验显示,胶束颗粒在胃液中有较好的稳定性,但在肠液中稳定性较差。

关键词： β-胡萝卜素辛烯基琥珀酸马铃薯糊精胶束稳定性

悬挂式止水帷幕基坑降水对临近地铁变形影响分析

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价值工程 2024年第15期43卷 115-118页

作者：雷丹上海勘察设计研究院(集团)股份有限公司上海200093

采用悬挂式止水帷幕的深基坑承压水降水对周边环境的影响问题不容忽视。以上海某临近地铁换成节点的深基坑项目为依托,分析了基坑开挖前试降水对临近地铁车站和隧道结构变形的影响规律。结果表明,采用悬挂式止水帷幕情况下坑内降水对坑... 详细信息

采用悬挂式止水帷幕的深基坑承压水降水对周边环境的影响问题不容忽视。以上海某临近地铁换成节点的深基坑项目为依托,分析了基坑开挖前试降水对临近地铁车站和隧道结构变形的影响规律。结果表明,采用悬挂式止水帷幕情况下坑内降水对坑外地铁结构变形影响量和影响范围均比较大,地铁结构变形量与结构刚度、与降水基坑的距离、降水基坑的面积、水位降深有比较大的相关性。

关键词：悬挂式止水帷幕承压水降水深基坑地铁变形

工业机器人如何影响出口竞争:“价格竞争”还是“质量竞争”

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中国工业经济 2024年第6期 99-116页

作者：初晓张丹蕾赵勇中国银行研究院中国人民大学经济学院

工业机器人技术的快速发展及其在生产领域中的广泛应用驱动全球贸易分工格局演变。厘清工业机器人影响出口的竞争机制,对于一国在日益激烈的国际竞争中占据主动至关重要。与以往文献主要关注机器人在供给侧的影响不同,本文同时在供给侧... 详细信息

工业机器人技术的快速发展及其在生产领域中的广泛应用驱动全球贸易分工格局演变。厘清工业机器人影响出口的竞争机制,对于一国在日益激烈的国际竞争中占据主动至关重要。与以往文献主要关注机器人在供给侧的影响不同,本文同时在供给侧与需求侧两端考察出口竞争机制。实证分析表明,工业机器人通过“价格竞争”和“质量竞争”共同促进企业出口,但“价格竞争”占主导地位,这一结论在进行工具变量检验和稳健性检验后依然成立。拓展分析发现,工业机器人使用缩短了出口产品的“价格阶梯”和“质量阶梯”,降低了产品价格和质量差异。此外,本文还发现,产品替代弹性和贸易成本的增加强化了工业机器人影响出口的“价格竞争”机制,而出口目的地市场竞争的加剧则强化了“质量竞争”机制。本文的研究有助于理解工业机器人在推动中国对外贸易高质量发展中的作用,为可能出现的全球贸易分工格局调整提供有效的应对之策。

关键词：工业机器人出口贸易价格竞争质量竞争

新田煤矿选煤厂无烟煤加工优质冶金烧结煤的经济效益分析

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煤炭加工与综合利用 2024年第5期 47-49页

作者：申雷丹聂丹永贵能源开发有限责任公司新田煤矿贵州黔西580081 义马煤业综能新能源有限责任公司河南义马472300

阐述了烧结用煤灰分增加对钢铁企业生产的影响,并对新田煤矿选煤厂利用现有选煤工艺,多出优质烧结用煤的经济效益进行了分析,提出多出烧结煤有利于无烟煤资源的更合理利用,同时可提高企业的经济效益。

关键词：选煤厂无烟煤末精煤高炉喷吹冶金烧结洗选加工