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NF_3 decomposition over Al_2O_3 reagents without water

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Journal of Natural Gas Chemistry 2011年第4期20卷 418-422页

作者： Xiufeng Xu Liang sun yanan Wang School of Chemistry and Biology Yantai University Yantai 264005 Shandong China

Several Al2O3 samples were prepared by a precipitation method coupled with ultrasonic treatment,and NF3 decomposition without water over Al2O3 reagents is carried *** effect of preparation parameters of Al2O3 reagents,such as precipitating agents,structure directing agents,and calcining temperatures on their reactivity for NF3 decomposition has been *** results show that NF3 can be decomposed completely at 400-C,and full conversion of NF3 maintains 580 min over the best Al2O3 reagent,calcined at 600-C which was prepared using both PEG-2000 and Tween-60 as structure directing agents,ammonia as a precipitating agent.

关键词： NF3 decomposition without water Al2O3 preparation parameters reactivity

Probing lysosomal activity in vivo

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Biophysics Reports 2021年第1期7卷 1-7页

作者： Xin Li yanan sun Xiaochen Wang National Laboratory of Biomacromolecules CAS Center for Excellence in Biomacromolecules Institute of Biophysics Chinese Academy of Science College of Life Sciences University of Chinese Academy of Sciences

Lysosomes are membrane-bound organelles for biomolecule degradation and recycling. They also serve as a nutrient sensing and signaling center to maintain cell and tissue homeostasis. Lysosomal properties alter in response to developmental or environmental cues, but these changes are hard to track in vivo. Employing C. elegans as a model system, we have developed assays to examine and quantify lysosome properties in vivo, including lysosome maturation, acidification and cleavage activity. These assays can be used to reveal alterations of lysosomal activity during C. elegans development and in stress conditions.

关键词： Maturation C. elegans Lysosomes Acidification Cleavage activity

Research of transient rotor dynamic characteristic of magnetic liquid double suspension bearing in double collision state

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High Technology Letters 2024年第2期30卷 146-157页

作者：刘洪美 LI Shengguo sun Chao sun yanan ZHAO Jianhua Shijiazhuang Rail Transit Group Co.Ltd Shijiazhuang 050011P.R.China Shijiazhuang Haishan Industrial Development Co.Ltd Shijiazhuang 050200P.R.China Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan UniversityQinhuangdao 066004P.R.China

During the operation of magnetic liquid double suspension bearing(MLDSB),due to rotor resonance,assembly error and other factor,the vibration amplitude of the rotor in resonance state exceeds the original design clearance,resulting in the collision damage between the rotor and the stator,the rotor and the *** paper presents a method to simulate the influence of different factors on the dynamic characteristics of 5 degrees of freedom(DOF)rotor based on the dynamic model of ***,according to the second Lagrange equation,the dynamic equation of 5 DOF rotor is derived,and the mathematical model is ***,based on 5 DOF rotor dynamic equation,the rotor transient dynamic equation under collision state is obtained,and the rotor transient collision dynamic simulation model is ***,the key influencing factors of rotor dynamic characteristics are extracted,and the influence mapping relationship of rotor displacement,axis locus and stress distribution under different factors is simulated by using ANSYS Workbench *** experimental results show that this method can effectively reflect the influence of various factors on the dynamic characteristics of the *** method can provide theoretical reference for the design and control of MLDSB.

关键词： displacement response axis trajectory radial excitation peak radial excitationtimes transient dynamic characteristics

Finite-size scaling of O(n) systems at the upper critical dimensionality

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National Science Review 2021年第3期8卷 53-61页

作者： Jian-Ping Lv Wanwan Xu yanan sun Kun Chen Youjin Deng Department of Physics Anhui Key Laboratory of Optoelectric Materials Science and Technology Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Normal University Department of Physics and Astronomy RutgersThe State University of New Jersey National Laboratory for Physical Sciences at Microscale and Department of Modern Physics University of Science and Technology of China Department of Physics and Electronic Information Engineering Minjiang University

Logarithmic finite-size scaling of the O(n) universality class at the upper critical dimensionality(dc=4) has a fundamental role in statistical and condensed-matter physics and important applications in various experimental ***,we address this long-standing problem in the context of the n-vector model(n=1,2,3) on periodic four-dimensional hypercubic *** establish an explicit scaling form for the free-energy density,which simultaneously consists of a scaling term for the Gaussian fixed point and another term with multiplicative logarithmic *** particular,we conjecture that the critical two-point correlation g(r,L),with L the linear size,exhibits a two-length behavior:follows r2-dcgoverned by the Gaussian fixed point at shorter distances and enters a plateau at larger distances whose height decays as L-dc/2(lnL)~p with p=1/2 a logarithmic correction *** extensive Monte Carlo simulations,we provide complementary evidence for the predictions through the finite-size scaling of observables,including the two-point correlation,the magnetic fluctuations at zero and nonzero Fourier modes and the Binder *** work sheds light on the formulation of logarithmic finite-size scaling and has practical applications in experimental systems.

关键词： critical phenomena universality class O(n) vector model finite-size scaling

Functions of the adaptor protein p66shc in solid tumors

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Frontiers in Biology 2015年第6期10卷 487-494页

作者： yanan sun Jie Yang Zhenyi Ma Department of Biochemistry and Molecular Biology School of Basic Medical Sciences Tianjin Medical University Tianjin 300070 China

p66she is a 66 kDa Src homology 2 domain containing （Shc） adaptor protein homolog. Previous studies have demonstrated that p66she is a proapoptotic protein involved in the cellular response to oxidative stress and in regulating mammalian lifespan. However, accumulating evidence also indicates its critical role in solid tumor progression. The expression of p66she varies in different types of solid tumors, and it can paradoxically promote as well as suppress tumor progression, survival, and metastasis, depending on the cellular context. In this review, we discuss its functions in various solid tumors, the mechanisms by which it mediates the process of anoikis （detachment-induced cell death）, and the epigenetic mechanisms that regulate its expression. These studies indicate the potential of p66she as a novel prognostic marker and therapeutic target for the prevention of tumor progression and metastasis.

关键词： adaptor protein p66she anoikis metastasis autophagy

Analysis of rotor eddy current loss and thermal deformation of magnetic liquid double suspension bearing

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High Technology Letters 2024年第3期30卷 322-332页

作者： LIU Hongmei YANG Guang sun yanan sun Jian WANG Zhe ZHAO Jianhua Shijiazhuang Rail Transit Group Co.Ltd Shijiazhuang 050011P.R.China Shijiazhuang Haishan Industrial Development Co.Ltd Shijiazhuang 050200P.R.China Fluid Power Transmission and Control Laboratory Yanshan UniversityQinhuangdao 066004P.R.China

Magnetic-liquid double suspension bearing(MLDSB)is a new type of suspension bearing based on electromagnetic suspension and supplemented by hydrostatic *** affecting the electromagnetic suspension force,the hydrostatic supporting effect is increased,and the real-time coupling of magnetic and liquid supporting can be ***,due to the high rotation speed,the rotor part produces eddy current loss,resulting in a large temperature rise and large ther-mal deformation,which makes the oil film thickness deviate from the initial *** support and bearing characteristics are seriously ***,this paper intends to explore the internal effects of eddy current loss of the rotor on the temperature rise and thermal deformation of ***,the 2D magnetic flow coupling mathematical model of MLDSB is established,and the eddy current loss distribution characteristics of the rotor are numerically simulated by Maxwell ***,the internal influence of mapping relationship of structural operating parameters such as input current,coil turns and rotor speed on rotor eddy current loss is revealed,and the changing trend of rotor eddy current loss under different design parameters is ***,the eddy cur-rent loss is loaded into the heat transfer finite element calculation model as a heat source,and the temperature rise of the rotor and its thermal deformation are simulated and analyzed,and the influ-ence of eddy current loss on rotor temperature rise and thermal deformation is ***,the pressure-flow curve and the distribution law of the internal flow field are tested by the particle image velocimetry(PIV)*** results show that eddy current loss increases linearly with the in-crease of coil current,coil turns and rotor *** effect of rotational speed on eddy current loss is much higher than that of coil current and coil *** maximum temperature rise,minimum temperature rise and maximum thermal defo

关键词： magnetic-liquid double suspension bearing(MLDSB) oil film thickness cur-rent loss thermal deformation particle image velocimetry(PIV)test

Comparative acetylome analysis reveals the potential mechanism of high fat diet function in allergic disease

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Food Science and Human Wellness 2023年第3期12卷 889-894页

作者： yanan sun Ning Liu Huihui Wang Taiqi Qu Fazheng Ren Yixuan Li Key Laboratory of Precision Nutrition and Food Quality Department of Nutrition and HealthChina Agricultural UniversityBeijing 100193China College of Food Science and Engineering Gansu Agricultural UniversityLanzhou 730070China

Modern technological lifestyles promote allergic diseases,especially food *** underlying molecular mechanisms remain to be *** acetylation is one of the most important post-translational modifications,and it is involved in regulating multiple body metabolic *** study aimed to clarify the effects of a high-fat diet(HFD)on allergy risk and the underlying ***-week-old male C57 BL/6 J mice were randomly divided into two groups and fed a normal fat diet(NFD)or HFD for 24 ***,serum lipids were measured,and skeletal muscle was collected for acetylome *** with the findings in the NFD group,HFD-fed mice were obese and *** analysis also revealed 32 differentially expressed proteins between the HFD and NFD *** these,eight acetylated proteins were upregulated in the HFD *** addition,13 and 11 proteins were acetylated only in the HFD group and NFD group,*** proteins were mainly involved in regulating energy metabolism and mitochondrial *** study provides information regarding the underlying molecular mechanisms by which HFD promotes allergy.

关键词： Allergic disease High fat diet Skeletal muscle Acetylome

Preparation and properties of CMAS resistant bixbyite structured high-entropy oxides RE_(2)O_(3)(RE=Sm,Eu,Er,Lu,Y,and Yb):Promising environmental barrier coating materials for Al_(2)O_(3)f/Al_(2)O_(3) composites

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Journal of Advanced Ceramics 2021年第3期10卷 596-613页

作者： yanan sun Huimin XIANG Fu-Zhi DAI Xiaohui WANG Yan XING Xiaojun ZHAO Yanchun ZHOU School of Materials Science and Engineering Central South UniversityChangsha 410083China Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials&Processing TechnologyBeijing 100076China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China New Energy Technology Engineering Laboratory of Jiangsu Province Nanjing University of Posts and TelecommunicationsNanjing 210023China

Y_(2)O_(3) is regarded as one of the potential environmental barrier coating(EBC)materials for Al_(2)O_(3)f/Al_(2)O_(3)ceramic matrix composites owing to its high melting point and close thermal expansion coefficient to Al_(2)O_(3).However,the relatively high thermal conductivity and unsatisfactory calcium-magnesium-aluminosilicate(CMAS)resistance are the main obstacles for the practical application of Y_(2)O_(3).In order to reduce the thermal conductivity and increase the CMAS resistance,four cubic bixbyite structured high-entropy oxides RE_(2)O_(3),including(Eu_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3),(Sm_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3),(Sm_(0.2)Eu_(0.2)Er_(0.2)Y_(0.2)Yb_(0.2))2O_(3),and(Sm_(0.2)Eu_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3)were designed and synthesized,among which(Eu_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3)and(Sm_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3)bulks were prepared by spark plasma sintering(SPS)to investigate their mechanical and thermal properties as well as CMAS *** mechanical properties of(Eu_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3)and(Sm_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3) are close to those of Y_(2)O_(3) but become more brittle than Y_(2)O_(3).The thermal conductivities of(Eu_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb_(0.2))2O_(3) and(Sm_(0.2)Er_(0.2)Lu_(0.2)Y_(0.2)Yb02)2O_(3)(5.1 and 4.6 W·m^(-1)·K^(-1))are only 23.8%and 21.5%respectively of that of Y_(2)O_(3)(21.4 W·m^(-1)·K^(-1)),while their thermal expansion coefficients are close to those of Y_(2)O_(3) and A12O_(3).Most importantly,HE RE_(2)O_(3) ceramics exhibit good CMAS *** being attacked by CMAS at 1350℃for 4 h,the HE RE_(2)O_(3) ceramics maintain their original morphologies without forming pores or cracks,making them promising as EBC materials for Al_(2)O_(3)f/Al_(2)O_(3) composites.

关键词： high-entropy ceramics rare earth oxides low thermal conductivity thermal expansion coefficient CMAS resistance

Visual sensing of picric acid in 100% aqueous media based on supramolecular polythiophene assemblies with colorimetric and fluorescent dual response

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Chinese Chemical Letters 2020年第9期31卷 2428-2432页

作者： Li Zhang yanan sun Yanping Jiang Yining Li Gang Song Kunlun Huang Zhiyi Yao College of Food Science and Nutritional Engineering China Agricultural University and Key Laboratory of Safety Assessment of Genetically Modified Organism(Food Safety)Ministry of AgricultureBeijing 100083China Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources Guangzhou UniversityGuangzhou 510006China

A colorimetric and fluorometric dual probe based on a water-soluble polythiophene derivative(PMTPBA)was designed and *** can be applied to determination of picric acid(PA) in 100% aqueous *** approach relies on the formation of supramolecular polythiophene assemblies in the presence of PA through electrostatic,charge transfer and π-π stacking *** probe could be utilized for the rapid and visual detection of PA both in aqueous solution and solid support with high specificity and *** detection limit of this sensor is as low as 5.0 × 10^-8 mol/L.

关键词： Colorimetric Fluorescent Picric acid Polythiophene Supramolecular complex