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Top-down control on major groups of global marine diazotrophs

Acta Oceanologica Sinica 2022年第8期41卷 111-119页

作者： hua Wang ya-Wei luo State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China

Dinitrogen(N_(2))fixed by a group of prokaryotes(diazotrophs)is the dominant process adding bioavailable nitrogen into the *** it has been intensively studied how N_(2) fixation is controlled by resources(bottom-up factors),it is unclear whether the grazing(top-down control)effectively impacts growth and distribution of different diazotroph *** this study,we evaluate this question by conducting log-log regression of diazotroph biomass onto corresponding N_(2) fixation rates in the global *** slope of the regression for Trichodesmium is~0.8,indicating that a small portion of the increase in N_(2) fixation does not accumulate as its *** leads to a conclusion that Trichodesmium is under a substantial top-down control,although bottom-up control still *** also analyze the residuals of the regression in the North Atlantic,concluding that free trichomes of Trichodesmium are subject to stronger top-down control than its *** weak correlation between the biomass and N_(2) fixation of unicellular cyanobacterial diazotrophs indicates that the degree of top-down control on this type of diazotrophs varies *** analyses obtain unrealistic results for diatom-diazotroph assemblages due to complicated nitrogen sources of these *** study reveals the variability of top-down control among different diazotroph groups across time and space,suggesting its importance in improving our understandings of ecology of diazotrophs and predictions of N_(2) fixation in biogeochemical *** of size-specific N_(2) fixation rates and growth rates of different diazotroph groups can be useful to more reliably analyze the top-down control on these key organisms in the global ocean.

关键词： marine diazotrophs nitrogen fixation top-down control bottom-up control Trichodesmium diatom-diazotroph assemblages

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Advanced Functional Electromagnetic Shielding Materials:A Review Based on Micro‑Nano Structure Interface Control of Biomass Cell Walls

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Nano-Micro Letters 2025年第1期17卷 98-134页

作者： yang Shi Mingjun Wu Shengbo ge Jianzhang Li Anoud Saud Alshammari Jing luo Mohammed A.Amin hua Qiu Jinxuan Jiang yazeed M.Asiri Runzhou huang hua Hou Zeinhom M.El‑Bahy Zhanhu guo Chong Jia Kaimeng Xu Xiangmeng Chen Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China State Key Laboratory of Efficient Production of Forest Resourced Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083People’s Republic of China Department of Physics Faculty of Sciences‑ArarNorthern Border UniversityArar 91431Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr CityCairo 11884Egypt Yunnan Provincial Key Laboratory of Wood Adhesives and glued Products International Joint Research Center for Biomass MaterialsSouthwest Forestry UniversityKunming 650224People’s Republic of China School of Science Henan Agricultural UniversityZhengzhou 450002People’s Republic of China

Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass *** materials offer numerous advantages such as being lightweight,porous,and *** to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EMI shielding *** concerted efforts on the EMI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EMI shielding *** particular,a more comprehensive study and summary of the factors influencing biomass EMI shielding materials including the pore structure adjustment,preparation process,and micro-control would be *** preparation methods and characteristics of wood,bamboo,cellulose and lignin in EMI shielding field are critically discussed in this paper,and similar biomass EMI materials are summarized and *** composite methods and fillers of various biomass materials were *** paper also highlights the mechanism of EMI shielding as well as existing prospects and challenges for development trends in this field.

关键词： Biomass materials Electromagnetic interference shielding Micro-nano structure interface control Conductivity

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Biocarbon with different microstructures derived from corn husks and their potassium storage properties

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Rare Metals 2021年第11期40卷 3166-3174页

作者： Meng Zhou Qing Wang Yuan Yuan Shao-hua luo ya-Hui Zhang Xin Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004China Hebei Key Laboratory of Dielectric and Electrolyte Functional Material Qinhuangdao 066004China Qinhuangdao Key Laboratory of Advanced Energy Storage and Conversion Technology Qinhuangdao 066004China

In this paper,biocarbon was prepared from corn husks as anode materials for potassium ion batteries at temperatures ranging from 700 to 1600℃.The prepared biocarbon materials have amorphous phase structure and possess larger interlayer spacing than *** biocarbon exhibits enhanced graphitic degree and decreased amounts of surface defects,while the carbonization temperature gradually *** obtained potassium ion battery electrode at 1300℃ acquired high reversible capacity up to 216.6 mAh·g^(-1) at 0.1 A·g^(-1) after 100 cycles, and retained 128.6 mAh·g^(-1) at 1 A·g^(-1) even after500 *** results indicate that the samples prepared at 1300℃ have better electrochemical performance than other samples prepared at different temperatures,which was attributed to the decisive influence of microstructure on surface-induced and intercalating potassium storage.

关键词： Biocarbon Potassium ion battery Carbonization Capacitance Electrochemical performance

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A Unit Root Test for an AR(1)Process with AR Errors by Using Random Weighted Bootstrap

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Acta Mathematica Sinica,English Series 2023年第9期39卷 1834-1854页

作者： Xiao Hui Liu ya Wen Fan Yu Zi Liu Shi hua luo School of Statistics and Data Science Jiangxi University of Finance and EconomicsNanchang330013P.R.China Key Laboratory of Data Science in Finance and Economics Jiangxi University of Finance and EconomicsNanchang330013P.R.China

A great deal of economic problems are related to detecting the stability of time series data,where the main interest is in the unit root *** this paper,we consider the unit root testing problem with errors being long-memory processes with the LARCH structure.A new test statistic is developed by using the random weighted bootstrap *** turns out that the proposed statistic has a chisquared distribution asymptotically regardless of the process being stationary or nonst at ionary,and with or without an intercept *** simulation results show that the statistic has a desired finite sample performance in terms of both size and power.A real data application is also given relying on the inflation rate data of 17 countries.

关键词： Autoregressive model random weighted bootstrap autoregressive errors unit root test

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Synthesis and electrochemical properties of Li FePO_(4) cathode material by ionic thermal method using eutectic mixture of tetramethyl ammonium chloride-urea

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Rare Metals 2021年第12期40卷 3477-3484页

作者： Si-Nan Li Shao-hua luo Liu yang Qing Wang ya-Hui Zhang Xin Liu School of Materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and Materials Northeastern University At QinhuangdaoQinhuangdao 066004China Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province Qinhuangdao 066004China

In this study, the LiFePO_(4) cathode was synthesized by the ionic thermal method using the deep eutectic mixture of tetramethyl ammonium chloride and urea. The synthetic conditions were systematically investigated by orthogonal experiments, which indicate that the optimal reaction time, reaction temperature, molar ratio of Li to DES and rotate speed are 96 h, 220 ℃, 1:14 and20 r·min^(-1), respectively. X-ray diffraction(XRD), scanning electron microscope(SEM) and transmission electron microscope(TEM) were characterized to investigate the crystalline structure and morphology of the obtained materials, indicating well-crystallized LiFePO_(4) with olivine structure. And the physical properties of LiFePO_(4) were explored through Fourier transform infrared spectroscopy(FTIR),57 Fe Mo¨ ssbauer absorption spectra and Raman spectra. An initial discharge capacity can reach 151 m Ah·g^(-1) at 0.1 C rate for LiFePO_(4) following by calcining at 600 ℃ under the optimal conditions, and it retains 125.1 m Ah·g^(-1) after 100 cycles. These results demonstrated that the addition of ionic liquids can improve the rate performance, cycle performance and ion diffusion rate of LiFePO_(4).

关键词： LiFePO_(4) Deep eutectic solvents Ionic thermal method Orthogonal experiments Electrochemical performance

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High-voltage LiCoO_(2) cathodes for high-energy-density lithiumion battery

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Rare Metals 2022年第12期41卷 3946-3956页

作者： Jing-Chao Zhang Zhe-Dong Liu Cui-hua Zeng Jia-Wei luo Yi-Da Deng Xiao-ya Cui ya-Nan Chen School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Beijing Frontier Research Center for Biological Structures Tsinghua UniversityBeijing 100084China Ministry of Education Key Laboratory of Protein Sciences Beijing Advanced Innovation Center for Structural BiologySchool of Life SciencesTsinghua UniversityBeijing 100084China

As the earliest commercial cathode material for lithium-ion batteries,lithium cobalt oxide(LiCoO_(2)) shows various advantages,including high theoretical capacity,excellent rate capability,compressed electrode density,*** now,it still plays an important role in the lithium-ion battery *** to these advantages,further increasing the charging cutoff voltage of LiCoO_(2)to guarantee higher energy density is an irresistible development trend of LiCoO_(2)cathode materials in the ***,using high charging cutoff voltage may induce a lot of negative effects,especially the rapid decay of cycle *** are mainly caused by rapid destruction of crystal structure and aggravation of interface side reaction at high voltage during the ***,how to maintain a stable crystal structure of LiCoO_(2)to ensure the excellent long cycle performance at high voltage is a hot research issue in the further application of LiCoO_(2).In this review,we summarized the failure causes and extensive solutions of LiCoO_(2)at high voltage and promoted some new modification ***,the development trend of solving the failure problem of high-voltage LiCoO_(2)in the future such as defect engineering and high-temperature shock technique is also discussed.

关键词： Lithium-ion battery Lithium cobalt oxide(LiCoO_(2))cathode High voltage Cycle performance Crystal structure

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Human amniotic epithelial cell transplantation for the repair of injured brachial plexus nerve: evaluation of nerve viscoelastic properties

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Neural Regeneration Research 2015年第2期10卷 260-265页

作者： hua Jin Qi yang Feng Ji ya-jie Zhang yan Zhao Min luo Jinan Maternity and Child Care Hospital China-Japan Union Hospital Jilin University Shandong Corps Hospital of Chinese People’s Armed Police Forces

The transplantation of embryonic stem cells can effectively improve the creeping strength of nerves near an injury site in animals. Amniotic epithelial cells have similar biological properties as em-bryonic stem cells; therefore, we hypothesized that transplantation of amniotic epithelial cells can repair peripheral nerve injury and recover the creeping strength of the brachial plexus nerve. In the present study, a brachial plexus injury model was established in rabbits using the C6root avulsion method. A suspension of human amniotic epithelial cells was repeatedly injected over an area 4.0 mm lateral to the cephal and caudal ends of the C6 brachial plexus injury site （1 × 106 cells/mL, 3μL/injection, 25 injections） immediately after the injury. The results showed that the decrease in stress and increase in strain at 7,200 seconds in the injured rabbit C6 brachial plexus nerve were mitigated by the cell transplantation, restoring the viscoelastic stress relaxation and creep properties of the brachial plexus nerve. The forepaw functions were also signiifcantly improved at 26 weeks after injury. These data indicate that transplantation of human amniotic epithelial cells can effec-tively restore the mechanical properties of the brachial plexus nerve after injury in rabbits and that viscoelasticity may be an important index for the evaluation of brachial plexus injury in animals.

关键词： nerve regeneration brachial plexus injury human amniotic epithelial cells forepaw function stress relaxation creep viscoelasticity neural regeneration

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Properties of Fe-Mn-Al alloys with different Mn contents using density functional theory

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Rare Metals 2023年第4期42卷 1387-1397页

作者： Xiang luo Jing Feng ya-Hui Liu Ming-Yu Hu Xiao-Yu Chong Ye-hua Jiang Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming650093China

The chemical stability,electronic structures,mechanical properties and Debye temperature of Fe-MnAl alloys were investigated using first-principles *** formation enthalpy and cohesive energy are negative for Fe-Mn-Al alloys,showing that they are thermodynamically *** has the lowest formation enthalpy,indicating that FeAl is the most stable alloy in the Fe-Mn-Al *** partial density of states,total density of states and electron density distribution maps were used to analyze the physical properties of the Fe-MnAl alloys.A combination of mainly covalent and metallic bonds exists in these Fe-Mn-Al alloys,resulting in good electronic conductivity,high melting points,and high *** alloys display disparate anisotropy due to the calculated different shapes of the 3D curved surface of the Young's modulus and anisotropic *** has the highest bulk modulus,shear modulus and Yong's modulus of 187.1,119.8 and 296.2 gPa,***,the Debye temperatures and sound velocity of these Fe-Mn-Al compounds were explored.

关键词： Fe-Mn-Al alloys Electronic structures Stability Mechanical properties Debye temperature First-principles calculation

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Study on the quality of recombinant proteins using matrix-assisted laser desorption ionization time of flight mass spectrometry

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World Journal of gastroenterology 1999年第3期5卷 235-240页

作者： ZHOU guo-hua luo guo-An SUN guo-Qing CAO ya-Cheng and ZHU Ming-Sheng 清华大学北京 100084 中科院南京土壤所江苏南京华东医学生物技术所江苏南京

AIM To study the possibility of matrix-assistedlaser desorption/ionization time of flight massspectrometry (MALDI--TOF MS) for controllingthe quality of recombinant *** By using MALDI--TOF MS, themoleCular weights and purity of recombinantbioactive proteins were *** The molecular weights and puritywere obtained in nine recombinant bioactiveproteins, including interleukin 2, tumor necrosisfactor Q, granulocyte--macrophage colonystimulating factor, interferon aZb, interferon al,erythropoietin, calmodulin and its fragment, andneuronal nitric oxide synthase were ***--TOF MS was also used to assay specificproteins in the mixtures and to characterize theerythropoietin tryptic *** The results showed that MALDITOF MS can be employed for the effective qualitycontrol of recombinant proteins.

关键词： MALDI time

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Microstructure evolution and precipitation behavior of Al-Mg-Si alloy during initial aging

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China Foundry 2023年第1期20卷 57-62页

作者： ya-ya Zheng Bing-hui luo Wei Xie Wang Li Department of Materials Engineering Hunan University of HumanitiesScience and TechnologyLoudi 417000HunanChina College of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science&TechnologyChangsha 410114China

The microstructure evolution and precipitation behavior of Al-Mg-Si alloy during initial aging were studied using hardness testing, conductivity testing, differential scanning calorimetry(DSC), and high resolution transmission electron microscopy(HRTEM). The results show that the precipitation sequence of the Al-Mg-Si alloy during initial aging can be represented as: supersaturated solid solution → spherical Mg/Si clusters → needle-like guinier Preston(gP) zone → β″. Clusters are completely coherent with the Al matrix. The gP zone with relatively complete independent lattice parameters that differ slightly from the Al matrix parameters, is oriented along the direction of Aland lying on {111}Alplane. The strength of the Al-Mg-Si alloy is greatly enhanced by the threedimensional strain field that exists between the β″ phase and the two {200}Alplanes. After aging at 170 ℃ for 6 h, the hardness reaches the peak of 127 HV and remains for a long time. At this stage, the electrical conductivity keeps relatively stable due to the formation of coherent precipitates(Mg/Si clusters/gP zones) and the reduction in solute atom concentration in the Al matrix. The severe coarsening and decreased number density of the β″ phase during the over-aging stage result in a significant decrease in the hardness.

关键词： Al-Mg-Si alloy precipitation behavior strengthening mechanism strain field β″

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