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Portable fluorogenic probe for monitoring of volatile amine vapour and food spoilage

Chinese Chemical Letters 2024年第3期35卷 257-261页

作者： Jian-Hao Zhao Wen-Xing Xu Bin Li Wei Xu Wu-Kun Zhang Ming-Shuai Yuan Hui-Zi Li Qing-Guo He Xiang Ma Jian-Gong Cheng yan-yan fu State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Center of Materials Science and Optoelectronics Engineering University of the Chinese Academy of SciencesBeijing 100039China School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

There are urgent needs of volatile amine gas sensors with high-performance in food quality control,disease monitoring and environmental ***-film fluorescent probe is suitable for amine vapour sensing due to its high sensitivity,high selectivity,and no polluting ***,a novel fluorescent probe based on indacenodithiophene structure withπconjugated system was designed and *** experimental results show that the films prepared by this material exhibit rapid and distinct fluorescence quenching after being exposed to saturated vapours of primary amine,secondary amine and tertiary amine represented by n-propylamine,diethylamine and trimethylamine,*** quenching of fluorescence is 84%,87%and 96%,respectively,within 10 *** detection mechanism of probe for primary amine is based on specific chemical reaction,while the detection mechanism for secondary amine and tertiary amine is intramolecular charge *** experiments show that the detection limit of the fluorescent probe for trimethylamine,an important marker of food spoilage,could reach 4.610 ***-site detection based on spoilage of small yellow croaker suggests the material possesses the potential for food freshness *** simple fluorogenic probe is an original approach to simplify real-time visual monitoring of volatile amine vapour.

关键词： Fluorescent probe Volatile amine Gas sensing Trimethylamine Food spoilage

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电镀参数对电沉积Sn-Ag-Cu合金镀层的影响

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稀有金属与硬质合金 2024年第1期52卷 63-68,80页

作者：文思倩闫焉服周慧程江洋河南科技大学材料科学与工程学院河南洛阳471023

采用自主研发的甲磺酸锡银铜电镀液在黄铜基体上制备了Sn-Ag-Cu合金镀层。通过扫描电子显微镜(SEM)及其自带的能谱仪(EDS)分析了电镀工艺参数对Sn-Ag-Cu合金镀层的成分、表面形貌以及镀层厚度产生的影响。结果表明,当电流密度为4 A/dm^... 详细信息

采用自主研发的甲磺酸锡银铜电镀液在黄铜基体上制备了Sn-Ag-Cu合金镀层。通过扫描电子显微镜(SEM)及其自带的能谱仪(EDS)分析了电镀工艺参数对Sn-Ag-Cu合金镀层的成分、表面形貌以及镀层厚度产生的影响。结果表明,当电流密度为4 A/dm^(2)、温度为25℃及pH为5.5时,可获得结晶较细且致密,表面平整光亮且厚度均匀的Sn-Ag-Cu合金镀层。

关键词： Sn-Ag-Cu合金电镀参数甲磺酸锡银铜电镀液表面形貌镀层厚度电流密度

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Experimental investigation on the relevance of mechanical properties and porosity of sandstone after hydrochemical erosion

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Journal of Mountain Science 2016年第11期13卷 2053-2068页

作者： CAI yan-yan YU Jin fu Guo-feng LI Hong School of Civil and Hydraulic Engineering Dalian University of Technology Dalian116024 China

Under the effect of chemical etching,the macroscopic mechanical properties,mesoscopic structure,mineral content,and porosity of rocks undergo significant changes,which can lead to the geological disasters; thus,an understanding of changes in the microscopic and macroscopic structure of rocks after chemical etching is *** this study,uniaxial mechanical tests and nuclear magnetic resonance(NMR) spectroscopy were carried out on sandstone samples that had been previously subjected to chemical erosion under different p H *** aim was to study changes in properties and mechanical characteristics,including deformation and strength characteristics,of the rock,and microscopic pore variation characteristics,and to perform preliminary studies of the chemical corrosion *** show that different chemical solutions have a significant influence on the uniaxial compressive strength,the axial strain corresponding to the peak axial stress,elastic modulus,*** the passage of time,porosity increases gradually with exposure to different chemical solutions,and exposure to chemical solutions results in large changes in the NMR T2 curve and T2 spectrum *** exposed to different chemical solutions exhibits different corrosion mechanisms; the root cause is the change of mineral.

关键词： Chemical erosion Hydrochemistry Mechanical properties Nuclear magnetic resonance Porosity Sandstone

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Effect of Ag and Ni on the melting point and solderability of SnSbCu solder alloys

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International Journal of Minerals,Metallurgy and Materials 2009年第6期16卷 691-695页

作者： yan-fu yan yan-sheng Wang Li-fang Feng Ke-xing Song Jiu-ba Wen Henan Key Laboratory of Advanced Non-ferrous Metals Luoyang 471003 China Architecture and Civil Engineering Institute Henan University of Science and Technology Luoyang 471003 China

To improve the properties of Sn10Sb8Cu solder alloy, two new solders （SnSbCuAg and SnSbCuNi） were formed by adding small amounts of Ag or Ni into the solder alloy. The results show that the melting point of the SnSbCuAg solder alloy decreases by 14.1℃ and the spreading area increases by 16.5% compared to the matrix solder. The melting point of the SnSbCuNi solder alloy decreases by 5.4℃ and the spreading area is slightly less than that of the matrix solder. Microstructure analysis shows that adding trace Ag makes the melting point decline due to the dispersed distribution of SnAg phase with low melting point. Adding trace Ni, Cu6Sn5 and （Cu, Ni）6Sn5 with polyhedron shape on the copper substrate can be easily seen in the SnSbCuNi solder alloy, which makes the viscosity of the melting solder increase and the spreading property of the solder decline.

关键词： solder alloy Ag Ni melting point solderability

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Recent advances in fluorescence sensor for the detection of peroxide explosives

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Chinese Chemical Letters 2016年第8期27卷 1429-1436,1471页

作者： Yu Zhang yan-yan fu De-Feng Zhu Jia-Qiang Xu Qing-Guo He Jian-Gong Cheng State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences Department of Chemistry College of SciencesShanghai University

The detection of peroxide explosives（PEs） has attracted considerable attention all over the world in global security owing to their simple preparation,poor chemical stability and easy *** recent years,great efforts have been devoted to developing organic fluorescence sensors for detecting the PEs because of their fast response,high sensitivity and high *** this short review,we firstly discuss the sensing mechanisms for fluorescence based the PEs ***,we reviewed recent progress of PE probes in the nearly 5 years and the design strategies of the material structures to enhance the sensitivity or selectivity,such as conjugated polymers and assembled nanoparticles.

关键词： Fluorescence Sensor Peroxide explosives Vapor Redox reaction

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Numerical Simulation of Temperature and Stress Fields of Ti-Alloy Thin-well Barrel during Quenching Process

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材料热处理学报 2004年第5B期25卷 769-771页

作者： LIyan-zeng yanMu-fu WUKun SchoolofMaterialsScienceandEngineering HarbinInstituteofTechnologyHarbinChina

The mathematical models have been established to describe the temperature and stress profiles in T16A14V cylinder during quenching. The residual stress and deformation of the workpiece can be predicted precisely based on ANSYS software. The simulated results show that the temperature of the divided element decreases faster at the edge than that at the internal of the workpiece during quenching from 1050 to 20°C. The largest temperature difference and dimension change in diameter are about 90°C and -0.935%, respectively. The position of largest tensile stress occurs around the edge of the cylinder.

关键词： FEM 温度场应力场数值模拟淬火钛合金

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Dynamic stress–strain properties of Ti–Al–V titanium alloys with various element contents

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Rare Metals 2013年第6期32卷 555-559页

作者： Rui Liu Song-Xiao Hui Wen-Jun Ye Cheng-Lin Li yan-yan fu yang Yu Xiao-Yun Song State Key Laboratory of Nonferrous Metals General Research Institute for Nonferrous Metals

A series of Ti–Al–V titanium alloy bars with nominal composition Ti–7Al–5V ELI,Ti–5Al–3V ELI,commercial Ti–6Al–4V ELI and commercial Ti–6Al–4V were *** alloys were then heat treated to obtain bimodal or equiaxed microstructures with various contents of primary a *** compression properties of the alloys above were studied by split Hopkinson pressure bar system at strain rates from 2,000 to 4,000 *** results show that Ti–6Al–4V alloy with equiaxed primary a(ap)volume fraction of 45 vol%or 67 vol%exhibits good dynamic properties with high dynamic strength and absorbed energy,as well as an acceptable dynamic ***,all the Ti53ELI specimens and Ti64ELI specimens with ap of 65 vol%were not fractured at a strain rate of4,000 *** appears that the undamaged specimens still have load-bearing *** strength of Ti–Al–V alloy can be improved as the contents of elements Al,V,Fe,and O increase,while dynamic strain is not sensitive to the composition in the appropriate *** effects of primary alpha volume fraction on the dynamic properties are dependent on the compositions of Ti–Al–V alloys.

关键词： Dynamic properties Alloying content Microstructure Titanium alloy

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Study on the Effects of Cytokine Level in Ducklings with Selenium Poisoning

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Agricultural Sciences in China 2007年第3期6卷 375-380页

作者： WU Rui LIAN Xue-zhao TANG Xiao-yan fu yan-ling HE Chong-yi College of Animal Science and Technology Heilongjiang August First Land Reclamation University Daqing 163319 P.R.China

One-day-old healthy ducklings （n = 100） were randomly allocated into two groups （n = 50, respectively） to investigate the effect of cytokines on ducklings with selenium poisoning. The ducklings in control group （Group Ⅰ） were fed with full rations containing 0.3 mg kg^-1 selenium, and the ducklings in selenium poisoning group （Group Ⅱ ） were fed with seleniumexcessive rations containing 8.0 mg kg^-1 selenium. One mL blood was collected by cardiac puncture at d 15, 30, 60, and 90 （n = 10, respectively）, serum was separated by centrifugation. Contents of cytokines were determined by the radioimmunity method （RIA）. The results showed that the contents of IL-113, IL-213 in Group Ⅱ were higher than that in control group at d 15 （P〉0.05）, but were significantly lower at d 30, 60, and 90 （P〈0.01）; the contents of IL-8β in Group II were significantly lower than that in control group （P〈0.01）; the contents of erythropoietin （EPO） and IGF-2 in Group II were significantly lower in different degree than that in control group at d 60 and 90 （P〈0.01）; the contents of granulocyte- macrophage colony stimulating factor （GM-CSF） in the two groups were lower in different degree and significantly lower at d 60 and 90 （P〈0.01）. It can be concluded that the excessive selenium could result in a decrease in immunity and a series of clinical pathology changes, such as anemia, tissue hemorrhage, and necrosis.

关键词： ducklings selenium poisoning cytokine

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Energy absorption behaviors of a novel buffer lander-leg with Yoshimura core

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Chinese Journal of Aeronautics 2024年第4期37卷 333-342页

作者： yan XU He HUANG Chao ZHANG Rongji fu School of Aeronautics and Astronautics Zhejiang UniversityHangzhou 310027China School of Mechanics Civil Engineering and Architecture Northwestern Polytechnical UniversityXi’an 710072China

In the current soft-landing system,the lander-leg and the buffer are two independent parts which may cause weight *** traditional mechanical buffers also have their own shortcomings such as small buffer stroke and being non-reusable.A Novel Buffer Lander-leg with Yoshimura core (NBLY) is proposed in this paper,inspired by the Buckling Restrained Brace(BRB).The design details of NBLY and parameter definitions of the core are *** finite element analysis modes have been employed to analyze the nonlinear mechanical behaviors of NBLY subjected to the cyclic *** with four different core styles of hexagon,octagon,dodecagon and hexadecagon are analyzed and *** restraining ratio and cumulative dissipation energy ratio have been obtained to evaluate the energy absorption *** results show that the origami pattern has significant influences on the deformation ductility,plastic energy absorbing and axial load transferring to the *** NBLY with octagon core has outstanding properties,especially the hysteretic energy dissipation and enhancement of compression *** interaction mechanism between the core and encasing member constrains the deformation extensions and contributes to the frictional energy dissipation of the *** paper provides a new conceptual design of buffer lander-leg for soft-landing *** can realize the reuse function as a buffer lander-leg with better loading-bearing and energy absorption behaviors.

关键词： Lander-leg structure Origami Energy absorption Cyclic loading Finite element analysis

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Link between childhood obesity and gut microbiota

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World Journal of Gastroenterology 2024年第30期30卷 3560-3563页

作者： yan Pan fu-Yong Jiao Department of Pediatrics The First Affiliated Hospital of Yangtze UniversityJingzho 434000Hubei ProvinceChina Shaanxi Kawasaki Disease Diagnosis and Treatment Center Children's HospitalShaanxi Provincial People's Hospital of Xi'anJiaotong UniversityXi'an 710000Shaanxi ProvinceChina

Childhood obesity is a critical global health concern with rising prevalence and significant long-term health *** studies have implicated gut microbiota in the development and progression of *** editorial analyzes the research conducted by Li et al,who utilized 16S rRNA gene sequencing to compare the gut microbiome of overweight and healthy-weight *** study found significant differences in microbial diversity and composition between the two groups,with potential implications for understanding and managing childhood *** analyzed the study’s advantages and drawbacks,proposing potential areas for future research to better understand the connection between gut microbiota and obesity.

关键词： 16S rRNA Childhood obesity Gut microbiota future research Global health

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