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Synergistic effect of cobalt and niobium in Co_(3)-Nb-O_(x)on performance of selective catalytic reduction of NO with NH_(3)

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Rare Metals 2022年第1期41卷 166-178页

作者： bo-Lin Zhang Li-Feng deng bo Liu Chun-Yun Luo Michael Liebau Shen-Gen Zhang Roger Glaser Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China Jiangsu Longkingcotech Co. Ltd.Yancheng 224000China Institute of Chemical Technology Universita¨t LeipzigLeipzig 04103Germany e-mail:roger.glaeser

Combining the redox properties of Co and the acid properties of Nb in a Co_(3)-Nb-O_(x)catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH_(3)(NH_(3)-SCR).Co_(3)O_(4)shows average activity,however,it exhibits a poor N_(2)***_(2)O_(5)is not active for NH_(3)-***,the mixed Co_(3)-Nb-O_(x) catalyst shows higher NO conversion and N_(2)selectivity than the single Co_(3)O_(4)and Nb_(2)O_(5)catalysts at 100–300℃.The results of temperature programmed reduction by H_(2)and X-ray photoelectron(XP)spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co^(3+) and Oa,adjusting the activity for catalytic oxidation to a moderate *** suppresses the formation of undesired N_(2)O from the over-oxidation of NH_(3).Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity,ensuring the high catalytic activity and N2 selectivity in NH3-SCR.

关键词： Co-Nb Selective catalytic reduction Lowtemperature Acid property Redox behavior

Effects of water depth on clonal characteristics and biomass allocation of Halophila ovalis (Hydrocharitaceae)

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Journal of Plant Ecology 2011年第4期4卷 283-291页

作者： na-na Xu Xin Tong Po-Kueug Eric Tsang Hong deng Xiao-Yong Chen Department of Environmental Sciences Shanghai Key Laboratory for Ecological Processes and Restoration in Urban AreaEast China Normal UniversityShanghai 200062China Department of Science and Environmental Studies Hong Kong Institute of EducationHong KongChina

Halophila ovalis is a dioecious seagrass with a wide geographical and water depth *** objective of this study was to understand its plasticity in clonal characteristics and biomass and also its allocation between above-and belowground in seagrass beds at different water *** Four monospecific *** beds,Shabei,Xialongwei,Beimu and Yingluo,which have different water depths at maximum tide level(MTL)but otherwise similar environmental conditions,were *** measured main clonal characteristics,*** internodal length,branching angle,shoot height,leaf length and width,and rhizome ***-and belowground biomasses of *** were also estimated using a harvest *** Findings We found no significant differences in coverage,leaf pair density or number of stem nodes per square meter between the four study ***,horizontal internodal length,leaf length,width,rhizome diameter and shoot height all increased significantly with the increases in water depth from 2-to 9-m MTL and decreased when the water depths were greater than 9-m *** significant difference in above-or belowground biomass between the seagrass beds was ***,the ratio of above-to belowground biomass was significantly higher in the shallowest site compared to the other three seagrass beds,indicating that more biomass was stored belowground in deeper *** results demonstrated plastic responses in clonal characteristics and biomass allocation in *** across the water depth gradient.

关键词： Halophila ovalis water depth gradient rhizome shoot biomass allocation seagrass

The SOLIDS 6G Mobile Network Architecture:Driving Forces,Features,and Functional Topology

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Engineering 2022年第1期8卷 42-59页

作者： Guangyi Liu na Li Juan deng Yingying Wang Junshuai Sun Yuhong Huang China Mobile Research Institute Beijing 100053China

With the large-scale commercial launch of fifth generation(5G)mobile network,the development of new services and applications catering to the year 2030,along with the deep convergence of information,communication,and data technologies(ICDT),and the lessons and experiences from 5G practice will drive the evolution of the next generation of mobile *** article surveys the history and driving forces of the evolution of the mobile network architecture and proposes a logical function architecture for sixth generation(6G)mobile *** proposed 6G network architecture is termed SOLIDS(related to the following basic features:soft,on-demand fulfillment,lite,native intelligence,digital twin,and native security),which can support self-generation,self-healing,self-evolution,and self-immunity without human involvement and address the primary issues in the legacy 5G network(e.g.,high cost,high power consumption,and highly complicated operation and maintenance),significantly well.

关键词： Sixth generation Network features Network architecture

A comparison between novel Gd_(2)Zr_(2)O_(7)and Gd_(2)Zr_(2)O_(7)/YSZ thermal barrier coatings fabricated by plasma spray-physical vapor deposition

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Rare Metals 2021年第8期40卷 2244-2253页

作者： Ren-bo Zhu Jian-Peng Zou Jie Mao Zi-Qian deng Xiao-Feng Zhang Chun-Ming deng Min Liu School of Materials Science and Engineering University of New South WalesSydneyNSW2052Australia State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China national Engineering Laboratory for Modern Materials Surface Engineering Technology and Key Laboratory of Guangdong for Modern Surface Engineering Technology Guangdong Institute of New MaterialsGuangzhou510651China

Spherical Gd_(2)Zr_(2)O_(7)hollow powders with a mean size of 8.8μm were fabricated as feedstock for thermal barrier coatings(TBCs)by *** single-ceramic-layer(SCL)Gd_(2)Zr_(2)O_(7)TBCs and double-ceramic-layer(DCL)Gd_(2)Zr_(2)O_(7)/YSZ TBCs with quasicolumnar structure were successfully fabricated by plasma spray-physical vapor deposition(PS-PVD).Tensile and water-quenching tests were applied to evaluate TBCs *** results show that adhesion strength of SCL Gd_(2)Zr_(2)O_(7)TBCs and DCL Gd_(2)Zr_(2)O_(7)/YSZ TBCs is36.5 MPa and 15.4 MPa,*** delamination of SCL Gd_(2)Zr_(2)O_(7)TBCs and DCL Gd_(2)Zr_(2)O_(7)/YSZ TBCs in the tensile test takes place at the middle and bottom of Gd_(2)Zr_(2)O_(7)layer,respectively,due to relatively lower fracture toughness of Gd_(2)Zr_(2)O_(7)*** 40 cycles of water-quenching test,DCL Gd_(2)Zr_(2)O_(7)/YSZ TBC surface keeps relatively intact,while SCL Gd_(2)Zr_(2)O_(7)TBC surface shows 20%visible destroyed regions,which demonstrates that DCL Gd_(2)Zr_(2)O_(7)/YSZ TBCs have a better thermal shock resistance than SCL Gd_(2)Zr_(2)O_(7)*** cracks in the SCL system propagate near thermally grown oxide(TGO)due to thermal mismatch and TGO growing stress,while cracks in the DCL system propagate in the Gd_(2)Zr_(2)O_(7)layer due to its relatively lower fracture toughness.

关键词： Plasma spray-physical vapor deposition Thermal barrier coatings Gd_(2)Zr_(2)O_(7) Thermal shock resistance Adhesion strength

High-dose dexamethasone regulates microglial polarization via the GR/JAK1/STAT3 signaling pathway after traumatic brain injury

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Neural Regeneration Research 2025年第9期20卷 2611-2623页

作者： Mengshi Yang Miao Bai Yuan Zhuang Shenghua Lu Qianqian Ge Hao Li Yu deng Hongbin Wu Xiaojian Xu Fei Niu Xinlong Dong Bin Zhang Baiyun Liu Beijing Tiantan Hospital Capital Medical UniversityBeijingChina Department of Neurology The First Hospital of Tsinghua UniversityBeijingChina Department of Neurotrauma and Beijing Key Laboratory of Central Nervous System Injury Beijing Neurosurgical InstituteCapital Medical UniversityBeijingChina Department of Critical Care Medicine Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Center for Nerve Injury and Repair Beijing Institute of Brain DisordersChina National Clinical Research Center for Neurological DiseasesBeijingChina

Although microglial polarization and neuroinflammation are crucial cellular responses after traumatic brain injury,the fundamental regulatory and functional mechanisms remain insufficiently *** potent anti-inflammato ry agents,the use of glucoco rticoids in traumatic brain injury is still controversial,and their regulatory effects on microglial polarization are not yet *** the present study,we sought to determine whether exacerbation of traumatic brain injury caused by high-dose dexamethasone is related to its regulatory effects on microglial polarization and its mechanisms of *** vitro cultured BV2 cells and primary microglia and a controlled cortical impact mouse model were used to investigate the effects of dexamethasone on microglial ***,dexamethasone,RU486(a glucocorticoid receptor antagonist),and ruxolitinib(a Janus kinase 1 antagonist)were ***-sequencing data obtained from a C57BL/6 mouse model of traumatic brain injury were used to identify potential targets of *** Morris water maze,quantitative reverse transcription-polymerase chain reaction,western blotting,immunofluorescence and confocal microscopy analysis,and TUNEL,Nissl,and Golgi staining were performed to investigate our ***-throughput sequencing results showed that arginase 1,a marker of M2 microglia,was significantly downregulated in the dexamethasone group compared with the traumatic brain injury group at3 days post-traumatic brain *** dexamethasone inhibited M1 and M2 microglia,with a more pronounced inhibitory effect on M2microglia in vitro and in *** receptor plays an indispensable role in microglial polarization after dexamethasone treatment following traumatic brain ***,glucocorticoid receptor activation increased the number of apoptotic cells and neuronal death,and also decreased the density of dendritic spines.A possible downstream receptor signaling mechanism is th

关键词： apoptosis BV2 microglia dexamethasone glucocorticoid receptor glucocorticoids innate immune system microglial polarization neuroinflammation primary microglia traumatic brain injury

A method for estimating masses of W Ursae Majoris-type binaries

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Research in Astronomy and Astrophysics 2020年第12期20卷 243-253页

作者： Li-na Lu Jin-Zhong Liu deng-Kai Jiang Ya-Hui Wang Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Yunnan Observatories Chinese Academy of SciencesKunming 650216China Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of SciencesKunming 650216China Laboratory of New Energy and Materials Xinjiang Institute of EngineeringUrumqi 830091China

Masses of W Ursae Majoris-type(W UMa) binaries play a critical role in investigating stellar dynamical evolutionary status. In this paper, we combine the PARSEC(PAdova and TRieste Stellar Evolution Code) with the Roche geometric model to provide a method to determine the masses of W UMa systems. To verify the validity of this method, we compile a sample of 140 spectrum binaries from the literature, which includes 76 W-and 64 A-subtype systems with reliable physical parameters. We find that the average fractional difference and the standard deviation(σM) of the residuals for W-subtype and Asubtype approximately amount to 15.66% and 0.1218, 16.03% and 0.2094, respectively. Meanwhile, we also perform detailed analyses in accordance with the orbital period, the effective temperatures and the mass ratio. We find that the method is more applicable to determine masses for W UMa systems with low effective temperature and short period.

关键词： stars:binaries:eclipsing W Ursae Majoris(W UMa)binaries masses

The influence of interface exchange coupling on the demagnetization process for perpendicularly oriented FePt/α-Fe/FePt trilayers

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Science China(Physics,Mechanics & Astronomy) 2010年第10期53卷 1836-1841页

作者： bo Niao ZHAO GuoPing YE LinNing XU JinSong deng Ya College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China School of Economic Information Engineering Southwestern University of Finance and EconomicsChengdu 610074China

The influence of the interface exchange coupling on the magnetization reversal process for a FePt/α-Fe/FePt tri-layer structure has been studied through a micromagnetic *** analytical formula of the nucleation field has been *** is found that the nucleation field increases as the interface coupling constant *** when the thickness of the soft layer is small,the influence of the exchange coupling on the nucleation field is *** angular distributions of the magnetization for various exchange coupling constants have been obtained by numerical *** is found that the angular distribution of the magnetization is discontinuous at the interface of the hard and soft *** the meantime,the pinning field decreases with the increase of the thickness of the soft layer and the exchange coupling constant.

关键词： interface exchange coupling nucleation field coercivity micromagnetic calculation

Impedance Characterization of the Film Formation Process at the Graphite Anodes

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Chinese Chemical Letters 2000年第10期11卷 915-918页

作者： bo Hua deng Yong Fang LI Hua Quan YANG Center for Molecular Science Institute of ChemistryChinese Academy of SciencesBeijing 100080 Department of Chemistry Peking UniversityBeijing 100875

In this paper, the formation mechanism of the passive SEI film at the natural graphite anodes was investigated with tilt: electrochemical impedance spectroscopy (EIS). A characteristic semicircle was observed in the lower frequency range of the EIS spectrum for the irreversible charge process (lithium intercalation) at ca. 0.75V, 0.40V and 0.20V.

关键词： electrochemical impedance spectroscopy surface film graphite anodes Li-ion battery

Soliton Solutions for Nonisospectral AKNS Equation by Hirota＇s Method

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Communications in Theoretical Physics 2006年第3期45卷 398-400页

作者： BI Jin-bo SUN Ye-Peng CHEN deng-Yuan Department of Mathematics Shanghai University Shanghai 200444 China

Bilinear form of the nonisospectral AKNS equation is given. The N-soliton solutions are obtained through Hirota＇s method.

关键词： nonisospectral AKNS equation soliton solutions Hirota's method