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Particuology 2017年第2期15卷 35-41页

作者： Rongzheng Liu Malin Liu Youlin Shao xiaotong chen Jingtao Ma Bing Liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Tsinghua University Beijing100084 China

Particle coating is an important method that can be used to expand particle-technology applications. coated-particle design and preparation for nuclear fuel-element trajectory tracing were focused on in this paper. Particles that contain elemental cobalt were selected bec.use of the characteristic gamma ray spectra of 60co. A novel particle-struc.ure design was proposed by coating particles that contain elemental cobalt with a high-density silicon-carbide （Sic） layer. During the coating process with the high-density Sic layer, cobalt metal was formed and diffused towards the coating, so an inner Sic–coxSi layer was designed and obtained by fluidized-bed chemical vapor deposition c.upled with in-situ chemical reaction. The coating layers were studied by X-ray diffractometry, scanning electron microscopy, and energy dispersive X-ray spectroscopy techniques. The chemical composition was also determined by inductively c.upled plasma optical emission spectrometry. The novel particle design can reduce the formation of metallic cobalt and prevent cobalt diffusion in the coating process, which can maintain safety in a nuclear reactor for an extended period. The experimental results also validated that coated particles maintain their struc.ural integrity at extremely high temperatures （～1950 °c）, which meets the requirements of next-generation nuclear reactors.

关键词： Particle coating Particle design cobalt Pluidized-bed chemical vapor deposition Nuclear fuel

Geochemical characterization of Granitoids in Katc.uan Irruan area: further evidence for peraluminous and shoshonitic compositions and post-collisional setting of granitic rocks in the Precambrian Basement complex of Nigeria

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Acta Geochimica 2019年第5期38卷 734-752页

作者： chinedu u.Ibe Smart c.Obiora Department of Geology University of Nigeria

Petrographic studies on Granitoids from Katc.uan Irruan and adjoining areas,southeastern Nigeria,has shown that they are garnetiferous biotite granite,aplitic granite,porphyritic hornblende biotite granite,porphyritic muscovite biotite granite,weakly foliated leucogranodiorite and simple *** are closely associated with the Precambrian Basement complex rocks which they *** analysis shows that the rocks consist of quartz(10%-25%),oligoclase(10%-30%),K-feldspar(15%-35%),biotite(3%-25%),with occasional garnet,hornblende,muscovite,and accessory chlorite,haematite and *** data indicates that the rocks are generally shoshonitic,alkali-calcic to calcic,ferroan and *** are enriched in large ion lithophile elements as well as high field strength elements(Hf,Ta,Yb,Sm,Zr and Y).Their trace elements and REE patterns are similar,indicating that they are *** are characterized by high fractionation factor(La/Yb)N(3.04-228.44)and pronounced negative Eu anomalies(Eu/Eu*)(0.23-0.71).Their overall geochemical features indicate that they were most likely derived from partial melting of c.ustal materials in an orogenic(post-collisional)tectonic *** are therefore related to the Pan-African granites,otherwise known as the Older Granites which were emplaced during the Pan African orogenic event.

关键词： Pan African Partial melting Post-collisional Precambrian Older Granites Orogenic

Effect of land use on soil nematode community composition and co-oc.urrence network relationship

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Journal of Integrative Agriculture 2024年第8期23卷 2807-2819页

作者： xiaotong Liu Siwei Liang Yijia Tian Xiao Wang Wenju Liang Xiaoke Zhang Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China Tillage and cultivation Research Institute Liaoning Academy of Agricultural SciencesShenyang 110161China university of chinese Academy of Sciences Beijing 100049China Key Lab of conservation Tillage and Ecological Agriculture in Liaoning Province Shenyang 110016China

Land use influences soil biota community composition and diversity,and then belowground ecosystem processes and *** characterize the effect of land use on soil biota,soil nematode communities in crop land,forest land and fallow land were investigated in six regions of northern *** richness,diversity,abundance and biomass of soil nematodes was the lowest in crop *** richness and diversity of soil nematodes were 28.8and 15.1%higher in fallow land than in crop land,*** significant differences in soil nematode indices were found between forest land and fallow land,but their network keystone genera composition was *** the keystone genera,50%of forest land genera were omnivores-predators and 36%of fallow land genera were *** proportion of fungivores in forest land was 20.8%lower than in fallow *** network complexity and the stability were lower in crop land than forest land and fallow *** pH,NH_(4)^(+)-N and NO_(3)^(–)-N were the major factors influencing the soil nematode community in crop land while soil organic carbon and moisture were the major factors in forest *** nematode communities in crop land influenced by artificial management practices were more dependent on the soil environment than communities in forest land and fallow *** use induced soil environment variation and altered network relationships by influencing trophic group proportions among keystone nematode genera.

关键词： soil nematode trophic groups community composition co-oc.urrence network land use

An In-Situ MRI Method for Quantifying Temperature changes during crystal Hydrate Growths in Porous Medium

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Journal of Thermal Science 2022年第5期31卷 1542-1550页

作者： ZHANG Lunxiang SuN Mingrui WANG Tian YANG Lei ZHANG xiaotong ZHAO Jiafei SONG Yongchen Key Laboratory of Ocean Energy utilization and Energy conservation of Ministry of Education School of Energy and Power EngineeringDalian University of TechnologyDalian116024China Interdisciplinary Institute of Neuroscience and Technology Zhejiang UniversityHangzhou310029China

Given the complexity of the thermo-hydro-chemically c.upled phase transition process of hydrates,real-time in-situ observations are *** maps are particularly essential in analyzing the heat transfer process during the growth and dissociation of crystal *** this study,we present the temporally and spatially resolved thermometry of the formation of tetrahydrofuran hydrates based on the temperature dependence of the chemical shift of the water *** of temperature changes were synchronously obtained using a 9.4 T^(1)H magnetic resonance imaging(MRI)system to predict the saturation level of the aqueous solution,phases of the solid hydrates,and the positive temperature anomaly of the exothermic *** was observed that variations in the MRI signal decreased while the temperature rise differed significantly in space and *** results predicted in this study c.uld have significant implications in optimizing the phase transition process of gas hydrates.

关键词： hydrate phase transition heat transfer porous medium temperature mapping magnetic resonance imaging thermometry thermodynamics and molecular-scale phenomena

Interface-rich Au-doped PdBi alloy nanochains as multifunctional oxygen reduction catalysts boost the power density and durability of a direct methanol fuel cell device

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Nano Research 2022年第7期15卷 6036-6044页

作者： Xin Li Ke Xin Yao Fengling Zhao xiaotong Yang Jingwei Li Yongfei Li Qiang Yuan State-Local Joint Laboratory for comprehensive utilization of Biomass Center for R&D of Fine ChemicalsCollege of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China State Key Laboratory of coal Mine Disaster Dynamics and control Chongqing UniversityChongqing 400044China Key Lab of Organic Optoelectronics&Molecular Engineering Tsinghua UniversityBeijing 100084China Multi-scale Porous Materials center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China

The development of cathode oxygen reduction reaction(ORR)catalysts with high characteristics for practical,direct methanol fuel cells(DMFcs)has continuously increased the attention of *** this work,interface-rich Au-doped PdBi(PdBiAu)branched one-dimensional(1D)alloyed nanochains assembled by sub-6.5 nm particles have been prepared,exhibiting an ORR mass activity(MA)of 6.40 A·mgPd^(−1) and long-term durability of 5,000 cycles in an alkaline *** MA of PdBiAu nanochains is 46 times and 80 times higher than that of commercial Pt/c(0.14 A·mgPt^(−1))and Pd/c(0.08 A·mgPd^(−1)).The MA of binary PdBi nanochains also reaches 5.71 A·mgPd^(−1).Notably,the PdBiAu nanochains exhibit high in-situ carbon monoxide poisoning resistance and high methanol *** ac.ual DMFc device tests,the PdBiAu nanochains enhance power density of 140.1 mW·cm^(−2)(in O_(2))/112.4 mW·cm^(−2)(in air)and durability compared with PdBi nanochains and Pt/*** analysis of the struc.ure–function relationship indicates that the enhanced performance of PdBiAu nanochains is attributed to integrated functions of surficial defect-rich 1D chain struc.ure,improved charge transfer capability,downshift of the d-band center of Pd,as well as the synergistic effect derived from“Pd-Bi”and/or“Pd-Au”dual active sites.

关键词： Au-doped PdBi(PdBiAu)nanochains one-dimensional struc.ure active auxiliary oxygen reduction reaction direct methanol fuel cells

Self-Assembly Protein Superstruc.ures as a Powerful chemodynamic Therapy Nanoagent for Glioblastoma Treatment

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Nano-Micro Letters 2020年第11期12卷 107-125页

作者： Tao Zheng Wentao Wang Jon Ashley Ming Zhang xiaotong Feng Jian Shen Yi Sun Department of Health Technology Technical University of Denmark2800 Kongens LyngbyDenmark Jiangsu collaborative Innovation center for Biomedical Functional Materials School of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023People’s Republic of China Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023People’s Republic of China

Glioblastoma(GBM) remains a formidable challenge in *** therapy(cDT) that triggers tumor cell death by reactive oxygen species(ROS) c.uld open up a new door for GBM ***,we report a novel cDT ***(Hb)and glucose oxidase(GOx) were employed as powerful cDT *** of encapsulating the proteins in drug delivery nanocarriers,we formulate multimeric superstruc.ures as self-delivery entities by crosslinking *** blood cell(RBc) membranes are camouflaged on the protein superstruc.ures to promote the delivery across blood-brain *** as-prepared RBc@Hb@GOx nanoparticles(NPs) offer superior biocompatibility,simplified struc.ure,and high ac.umulation at the tumor *** successfully demonstrated that the NPs c.uld efficiently produce toxic ROS to kill u87 MG cancer cells in vitro and inhibit the growth of GBM tumor in vivo,suggesting that the new cDT nanoagent holds great promise for treating GBM.

关键词： Self-assembly protein superstruc.ures Glioblastoma therapy chemodynamic therapy Self-delivery entities Blood-brain barrier

Flammulina velutipes polysaccharide-iron (Ⅲ) complex used to treat iron deficiency anemia after being absorbed via GLuT2 and SGLT1 transporters

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Food Science and Human Wellness 2023年第5期12卷 1828-1840页

作者： chenying Shi chen cheng xiaotong Lin Yanfang Qian Yufeng Du Guitang chen Department of Food Nutrition and Safety/National R&D center for chinese Herbal Medicine Processing China Pharmaceutical UniversityNanjing 211198China college of Pharmacy China Pharmaceutical UniversityNanjing 211198China

Iron deficiency anemia(IDA)is a common nutritional problem, but traditional iron supplements c.use many adverse reactions. Thus, the development of a novel iron supplement might be significant for the treatment of IDA. This study aimed to study the transport mechanism of Flammulina velutipes polysaccharide-iron complex(FVP1-Fe(Ⅲ))in caco-2 cells and the therapeutic effect on IDA rats, as well as the influence on gut microbiota in vivo. These results showed that in vitro, the uptake of FVP1-Fe(Ⅲ)was mediated by sodium-dependent glucose transporter-1(SGLT1)and facilitated glucose transporter-2(GLuT2)and GLuT2 played a dominant function. The multidrug resistance-associated protein-2(MRP-2)was involved in the efflux of FVP1-Fe(Ⅲ)across the caco-2 cells. In vivo, FVP1-Fe(Ⅲ)had a better restorative effect on blood parameters and iron status indicators in rats with IDA as compared with FeSO_4 and exerted this effect by downregulating the expression of hepcidin. FVP1-Fe(Ⅲ)c.uld also regulate gut microbiota dysbiosis in iron deficiency rats by returning the relative abundance of gut microbiota to the normal level. Besides, as a dietary factor, vitamin c(vit c)c.uld enhance the therapeutic effect of FVP1-Fe(Ⅲ). These present findings showed that FVP1-Fe(Ⅲ)c.uld be exploited as a novel iron supplement to treat IDA.

关键词： Flammulina velutipes polysaccharide Iron deficiency anemia Iron supplement caco-2 cell model Gut microbiota

Glycoside-specific metabolomics combined with precursor isotopic labeling for characterizing plant glycosyltransferases

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Molecular Plant 2022年第10期15卷 1517-1532页

作者： Jie Wu Wentao Zhu xiaotong Shan Jinyue Liu Lingling Zhao Qiao Zhao Shenzhen Key Laboratory of Synthetic Genomics Guangdong Provincial Key Laboratory of Synthetic GenomicsCAS Key Laboratory of Quantitative Engineering BiologyShenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Innovation center of Pesticide Research Department of Applied ChemistryCollege of ScienceChina Agricultural UniversityBeijing 100193China center for Plant Biology School of Life SciencesTsinghua UniversityBeijing 100084China

Glycosylation by uridine diphosphate-dependent glycosyltransferases(uGTs)in plants contributes to the complexity and diversity of secondary *** are generally promiscuous in their use of acceptors,making it challenging to reveal the function of uGTs in ***,we described an approach that combined glycoside-specific metabolomics and precursor isotopic labeling analysis to characterize uGTs in *** revisited the uGT72E c.uster,which has been reported to catalyze the glycosylation of ***-specific metabolomics analysis reduced the number of differentially ac.umulated metabolites in the ugt72e1e2e3 mutant by at least 90%compared with that from traditional untargeted metabolomics *** addition to the two previously reported monolignol glycosides,a total of 62 glycosides showed reduced ac.umulation in the ugt72e1e2e3 mutant,22 of which were phenylalanine-derived glycosides,inc.uding 5-OH coniferyl alcohol-derived and lignan-derived glycosides,as confirmed by isotopic tracing of[^(13)c_(6)]-phenylalanine *** method revealed that uGT72Es c.uld use c.umarins as substrates,and genetic evidence showed that uGT72Es endowed plants with enhanced tolerance to low iron availability under alkaline *** the newly developed method,the function of uGT78D2 was also *** case studies suggest that this method can substantially contribute to the characterization of uGTs and efficiently investigate glycosylation processes,the complexity of which have been highly underestimated.

关键词： glycosyltransferases glycosides-specific metabolomics precursor isotopic labeling glucoside Arabidopsis thaliana phenylpropanoid c.umarins

Performance improvement of a pulse tube cryocooler with a single compressor through cascade utilization of cold energy

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Frontiers in Energy 2021年第2期15卷 345-357页

作者： Xuming LIu Xiafan Xu Biao YANG xiaotong XI Liubiao cHEN Junjie WANG Yuan ZHOu Key Laboratory of cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China university of the chinese Academy of Sciences Beijing 100049China

The high-frequency pulse tube cryocooler(HPTc)has been attracting increasing and widespread attention in the field of cryogenic technology bec.use of its compact struc.ure,low vibration,and reliable *** gas-c.upled HPTc,driven by a single compressor,is currently the simplest and most compact *** HPTcs operating below 20 K,in order to obtain the mW cooling capacity,hundreds or even thousands of watts of electrical power are consumed,where radiation heat leakage acc.unts for a large proportion of their cooling *** this paper,based on SAGE10,a HPTc heat radiation calculation model was first established to study the effects of radiation heat leakage on apparent performance parameters(such as temperature and cooling capacity),and internal parameters(such as enthalpy flow and gas distribution)of the gas-c.upled *** active thermal insulation method of cascade utilization of the cold energy of the system was proposed for the gas-c.upled *** simulations indicate that the reduction of external radiation heat leakage cannot only directly increase the net cooling power,but also decrease the internal gross losses and increase the mass and ac.ustic power in the lower-temperature section,which further enhances the refrigeration *** numerical calculation results were verified by experiments,and the test results showed that the no-load temperature of the developed cryocooler prototype decreased from 15.1 K to 6.4 K,and the relative carnot efficiency at 15.5 K increased from 0.029%to 0.996%when substituting the proposed active method for the traditional passive method with multi-layer thermal insulation materials.

关键词： radiation heat leakage active thermal insulation cascade utilization cold energy performance improvement cryocooler

Hetero‑Interfaces on cu Electrode for Enhanced Electrochemical conversion of cO_(2)to Multi‑carbon Products

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Nano-Micro Letters 2022年第8期14卷 181-193页

作者： xiaotong Li Jianghao Wang Xiangzhou Lv Yue Yang Yifei Xu Qian Liu Hao Bin Wu Institute for composites Science Innovation(IncSI)and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Electrochemical cO_(2)reduction reaction(cO_(2)RR)to multi-carbon products would simultaneously reduce cO_(2)emission and produce high-value ***,we report cu electrodes modified by metal–organic framework(MOF)exhibiting enhanced electrocatalytic performance to convert cO_(2) into ethylene and *** Zr-based MOF,uiO-66 would in situ transform into amorphous ZrOx nanoparticles(a-ZrO_(x)),constructing a-ZrOx/cu hetero-interface as a dual-site *** Faradaic efficiency of multi-carbon(c2+)products for optimal uiO-66-coated cu(0.5-uiO/cu)electrode reaches a high value of 74%at−1.05 V versus *** intrinsic activity for c2+products on 0.5-uiO/cu electrode is about two times higher than that of cu *** situ surface-enhanced Raman spectra demonstrate that uiO-66-derived a-ZrO_(x)coating can promote the stabilization of atop-bound cO^(*)intermediates on cu surface during cO_(2)electrolysis,leading to increased cO^(*)coverage and facilitating the c–c c.upling *** present study gives new insights into tailoring the adsorption configurations of cO_(2)RR intermediate by designing dual-site electrocatalysts with hetero-interfaces.

关键词： cO_(2)reduction reaction Metal–organic frameworks copper Hetero-interfaces Multi-carbon products