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Effects of water molecules on luminescence in europium and terbium coordination polymers with p-fluorobenzoic acid as ligand

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Journal of Rare Earths 2024年第7期42卷 1258-1264,I0003页

作者： Xiaoqi Zhao Puyan Hao Yami Ling Mengzhen jia Rui Zhu jiawen Liu Qiang Xu jianhong Zhou Collaborative Innovation Center of Rare-Earth Optical Functional Materials and Devices Development Baoji Key Laboratory of Micro-Nano Optoelectronics and Terahertz TechnologySchool of Physics and Opto-Electronic TechnologyBaoji University of Arts and SciencesBaoji721016China

Our previous experimental observations show that the crystal structure of lanthanide luminescent complexes synthesized in aqueous solution usually contains a large number of coordination water molecules or free water *** order to probe the influence of water molecules on luminescent processes of lanthanide complexes,the photoluminescence properties of Ln-FBA(Ln=Eu and Tb,FBA=p-fluorobenzoic acid)coordination polymers at different ambient temperatures,in different solvents and aqueous DMSO solutions with different volume concentrations were systematically *** experiment results show that the presence of water molecules can promote the energy transfer from FBA ligand to Ln3+,at the same time,can cause luminescent non-radiation quenching of lanthanide *** addition,the variation of emission intensity ratio of 615 nm/591 nm peaks of Eu^(3+)with increasing the volume concentration of H_(2)O can be potentially used for the quantitatively detection of water traces in organic *** order to suppress the non-radiation quenching caused by the water molecules,Ln-FBA(Ln=Eu and Tb)coordination polymers were embedded into the PVP matrix to prepare Ln-FBA@PVP hybrid *** photoluminescence investigation indicates that PVP can not only block the quenching effect of water molecules on luminescence,but also effectively sensitize Eu^(3+)and Tb^(3+)*** experimental conclusions are useful for probing the influence of water molecules on luminescent processes of lanthanide complexes,quantitatively detecting water traces in organic solvents and enhancing the photoluminescence intensity in lanthanide complexes.

关键词： Lanthanide complexes Photoluminescence Luminescent quenching Rare earths

Ultralight Magnetic and Dielectric Aerogels Achieved by Metal-Organic Framework Initiated Gelation of Graphene Oxide for Enhanced Microwave Absorption

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Nano-Micro Letters 2022年第7期14卷 16-31页

作者： Xiaogu Huang jiawen Wei Yunke Zhang BinBin Qian Qi jia Jun Liu Xiaojia Zhao Gaofeng Shao Institute of Advanced Materials and Flexible Electronics(IAMFE) School of Chemistry and Materials ScienceNanjing University of Information Science and TechnologyNanjing 210044People’s Republic of China Department of Chemical and Biological Engineering Monash UniversityVictoria 3800Australia College of Field Engineering Army Engineering University of PLANanjing 210007People’s Republic of China Hebei Key Laboratory of Inorganic Nano-Materials College of Chemistry and Materials ScienceHebei Normal UniversityShijiazhuang 050024People’s Republic of China School of Chemistry and Environmental Engineering Yancheng Teachers UniversityYancheng 224002People’s Republic of China

The development of a convenient methodology for synthesizing the hierarchically porous aerogels comprising metal–organic frameworks(MOFs)and graphene oxide(GO)building blocks that exhibit an ultralow density and uniformly distributed MOFs on GO sheets is important for various ***,we report a facile route for synthesizing MOF/reduced GO(rGO)aerogels based on the gelation of GO,which is directly initiated using MOF *** metal ions exposed on the surface of MIL-88A nanorods act as linkers that bind GO nanosheets to a three-dimensional porous network via metal–oxygen covalent or electrostatic *** MOF/rGOderived magnetic and dielectric aerogels Fe_(3)O_(4)@C/rGO and Ni-doped Fe_(3)O_(4)@C/rGO show notable microwave absorption(MA)performance,simultaneously achieving strong absorption and broad bandwidth at low thickness of 2.5(-58.1 dB and 6.48 GHz)and 2.8 mm(-46.2 dB and 7.92 GHz)with ultralow filling contents of 0.7 and 0.6 wt%,*** microwave attenuation ability of the prepared aerogels is further confirmed via a radar cross-sectional simulation,which is attributed to the synergistic effects of their hierarchically porous structures and heterointerface *** work provides an effective pathway for fabricating hierarchically porous MOF/rGO hybrid aerogels and offers magnetic and dielectric aerogels for ultralight MA.

关键词： Magnetic and dielectric aerogels Metal-organic frameworks Gelation mechanism Microwave absorption Radar cross-sectional simulation

In vitro corrosion behavior of the extruded Mg–4Zn–1Mn alloy in different physiological solutions for biomedical applications

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Progress in Natural Science:Materials International 2023年第4期33卷 467-477页

作者： Yang Zheng He Tong jiawen Liu jia Lu Weirong Li Fangfei Liu Ziyue Zhang Yan Li School of Aeronautics and Astronautics Tiangong University School of Mechanical Engineering Tiangong University Dongguan Eontec Co.Ltd. School of Materials Science and Engineering Beihang University

The extruded Mg–4Zn–1Mn alloy was prepared and its in vitro corrosion behavior in different physiological solutions of simulated body fluid(SBF), artificial saliva(AS) and artificial urine(AU) was investigated for biomedical applications. The microstructural characterization by optical microscope(OM), X-ray diffractometer(XRD), scanning electron microscopy(SEM) and energy dispersive X-ray spectrometer(EDS) showed that the alloy with an average grain size of approximate 20 μm was mainly composed of α-Mg matrix phase along with some MgZn2and α-Mn precipitates. The results of electrochemical corrosion and immersion corrosion tests revealed a distinct corrosion behavior for the alloy in different solutions with increasing immersion time. The corrosion morphologies were featured with flocculent precipitates in the SBF, flower-like clusters in the AS and columnar crystals in the AU. The alloy exhibited highest corrosion resistance and lowest corrosion rate in the AS compared with the SBF and the AU, which was attributed to the formation of a stable corrosion products layer.

关键词： Biodegradable metals Mg–4Zn–1Mn alloy Physiological solutions Corrosion behavior

A review of converting woody biomass waste into useful and eco-friendly road materials

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Transportation Safety and Environment 2022年第1期4卷 2-16页

作者： Xue Zhang Hui Li John THarvey Ali AButt Ming jia jiawen Liu Key Laboratory of Road and Traffic Engineering of the Ministry of Education College of Transportation EngineeringTongji University4800 Cao’an RdJiading DistrictShanghai 201804China Univerisity of California Pavement Research Center Department of Civil and Environmental EngineeringUniversity of CaliforniaDavisDavisCalifornia95616-8500USA Urban Mobility Institute Tongji University4800 Cao’an RdJiading DistrictShanghai 201804China

Because of abundant reserves and renewable and environmentally friendly properties,the utilization of woody biomass waste in road engineering can alleviate the shortage of fossil fuels and carbon emissions so as to mitigate global climate change and achieve sustainable development of road *** paper synthesizes the state of the art about the strategies of applying five kinds of resources derived from waste woody biomass,including biochar,bio-oil,lignin,wood ash and nanocellulose to road *** on the characteristics analysis of the five materials,it can be concluded that biochar can comprehensively improve the road performance of asphalt and its mixtures,and has the potential of runoff purification;bio-oil can soften asphalt and improve its lowtemperature performance,but has negative effects on high-temperature performance;lignin increases the asphalt ageing resistance and can be used as a regenerant,and will improve the overall performance of asphalt mixtures if combined with other modifiers;wood ash can increase subgrade bearing capacity and bring significant environmental benefits;nanocellulose improves the strength of cement mortar,but there is a lack of research on its effects on performance of pavement materials and the interaction mechanism;the lifecycle environmental and economic assessment of woody biomass-modified road materials is not ***,prospects were also summarized to show the opportunities for future study,such as the establishment of a database for *** review provides useful insights for the utilization of woody biomass as road materials to achieve waste management and sustainable development.

关键词： Road material Biomass Biochar Bio-oil Lignin Nanocellulose

Flexible Organic Single Crystal with Elastic Bending and Plastic Twisting Capabilities

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Chinese Journal of Structural Chemistry 2022年第12期41卷 4-6页

作者： jiang Peng Wanjun Zhao Jing Zhang Chuchu Han Junhui jia Tingting Feng jiawen Sun Key Laboratory of Magnetic Molecules and Magnetic Information Material Ministry of EducationCollege of Chemistry and Material ScienceShanxi Normal UniversityTaiyuan 030000China

INTRODUCTION Organic single crystals have found wide-spread applications in smart materials,[1]optical waveguide devices,[2]photonic applications,[3]lasers,[4]OLED materials,and so on.

关键词： waveguide Crystal OLED

基于物联网的移动电话APP远程监控植物灌溉系统设计

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机电工程技术 2021年第3期50卷 149-152页

作者：钱晓艳迟明路程存欣贾佳文张照奇仝鑫彭旭峰河南工学院河南新乡453003 中车大连电力牵引研发中心有限公司辽宁大连116022 动车组和机车牵引与控制国家重点实验室辽宁大连116022

为了实现对植物进行远程灌溉和监控,减少水资源浪费,提高灌溉效率,设计了基于物联网的移动电话APP远程监控植物灌溉系统,利用物联网控制器实现对土壤湿度、环境温湿度、环境光照强度和环境气体的检测,综合各检测值并根据不同种类植物所... 详细信息

为了实现对植物进行远程灌溉和监控,减少水资源浪费,提高灌溉效率,设计了基于物联网的移动电话APP远程监控植物灌溉系统,利用物联网控制器实现对土壤湿度、环境温湿度、环境光照强度和环境气体的检测,综合各检测值并根据不同种类植物所需水分的不同设定浇水阈值。系统由物联网控制器、继电器、土壤湿度传感器、环境温湿度传感器、光照传感器和气体传感器、隔膜水泵、可滴可喷一体调节喷头、水管等组成,能实时监测土壤水分含量并远程开启水泵进行泵水作业,从而实现灌溉植物的智能控制。

关键词：物联网移动电话APP 远程监控植物灌溉

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肠道微型机器人非接触方位磁控系统研究

河南工学院学报 2021年第6期29卷 23-28页

作者：迟明路王元利常成钱晓艳任沁超王江涛贾佳文朱命冬河南工学院智能工程学院河南新乡453003 河南工学院车辆与交通工程学院河南新乡453003 河南工学院经济学院河南新乡453003 江苏汇博机器人技术股份有限公司江苏苏州215121 不详

为实现胃肠道疾病诊察过程中微型机器人能够被简单、有效地驱动,研制了一种手持式非接触方位磁控系统。首先,利用3D打印技术制造微型机器人本体,内部置入径向磁化圆柱永磁体作为内驱动器。然后,利用磁机耦合作用产生的磁力矩,驱动微型... 详细信息

为实现胃肠道疾病诊察过程中微型机器人能够被简单、有效地驱动,研制了一种手持式非接触方位磁控系统。首先,利用3D打印技术制造微型机器人本体,内部置入径向磁化圆柱永磁体作为内驱动器。然后,利用磁机耦合作用产生的磁力矩,驱动微型机器人在外部条形磁铁产生的旋转磁场作用下前进;使用TB6560步进电机驱动器驱动步进电机,能实现微型机器人的加减速、正反转运动。最后,通过试验验证了系统的控制效果。结果表明,随着微型机器人与步进电机之间距离的增加,外磁场对微型机器人的转速控制能力逐渐减弱,最大有效控制距离为20 cm,对应的最佳距离为8—10 cm。微型机器人控制距离也与内驱动器材料密切相关,通过调整控制距离和外部磁铁转速,可以控制微型机器人的运动速度。研究成果为体内医疗微型机器人的方便、有效控制奠定了临床基础,具有良好的医疗前景。

关键词：肠道微型机器人非接触方位磁控系统手持式磁场发生器

Development of oligonucleotide probes for FISH karyotyping in Haynaldia villosa,a wild relative of common wheat

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The Crop Journal 2020年第4期8卷 676-681页

作者： jia Lei jiawen Zhou Haojie Sun Wentao Wan Jin Xiao Chunxia Yuan Miroslava Karafiátová Jaroslav Dolezel Haiyan Wang Xiue Wang State Key Laboratory of Crop Genetics and Germplasm Enhancement Cytogenetics InstituteNanjing Agricultural University/JCIC-MCPNanjing 210095JiangsuChina Institute of Experimental Botany Czech Academy of SciencesCentre of the Region Hana for Biotechnological and Agricultural ResearchŠlechtitelů3177900 OlomoucCzech Republic

Haynaldia villosa is a wild relative of wheat and a valuable gene resource for wheat *** to the limited number of probes available for fluorescence in situ hybridization(FISH),the resolution at which the karyotype of *** can be characterized is poor,hampering accurate characterization of small segmental alien *** designed ten oligonucleotide probes using tandem repeats in DNA sequences derived from the short arm of *** chromosome 6 V(6 VS).FISH with seven of them resulted in clear signals on *** *** these,we constructed FISH karyotypes for *** using oligo-6 VS-1 and oligo-6 VS-35 oligonucleotides and characterized the distribution of the two probes in five different *** *** new FISH probes can efficiently characterize *** introgressions into wheat.

关键词： Chromosome identification Haynaldia villosa Oligonucleotide probes Tandem DNA repeats

M^(2)LC-Net: A Multi-Modal Multi-Disease Long-Tailed Classification Network for Real Clinical Scenes

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China Communications 2021年第9期18卷 210-220页

作者： Zhonghong Ou Wenjun Chai Lifei Wang Ruru Zhang jiawen He Meina Song Lifei Yuan Shengjuan Zhang Yanhui Wang Huan Li Xin jia Rujian Huang Beijing University of Posts and Telecommunications Beijing 100876China Hebei Eye Hospital Xingtai 054001China

Leveraging deep learning-based techniques to classify diseases has attracted extensive research interest in recent ***,most of the current studies only consider single-modal medical images,and the number of ophthalmic diseases that can be classified is relatively ***,imbalanced data distribution of different ophthalmic diseases is not taken into consideration,which limits the application of deep learning techniques in realistic clinical *** this paper,we propose a Multimodal Multi-disease Long-tailed Classification Network(M^(2)LC-Net)in response to the challenges mentioned above.M^(2)LC-Net leverages ResNet18-CBAM to extract features from fundus images and Optical Coherence Tomography(OCT)images,respectively,and conduct feature fusion to classify 11 common ophthalmic ***,Class Activation Mapping(CAM)is employed to visualize each mode to improve interpretability of M^(2)*** conduct comprehensive experiments on realistic dataset collected from a Grade III Level A ophthalmology hospital in China,including 34,396 images of 11 disease *** results demonstrate effectiveness of our proposed model M^(2)*** with the stateof-the-art,various performance metrics have been improved ***,Cohen’s kappa coefficient κ has been improved by 3.21%,which is a remarkable improvement.

关键词： deep learning multi modal long-tail ophthalmic disease classification