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Structural integrity and damage of ZrB_(2) ceramics after 4 MeV Au ions irradiation

Journal of Materials Science & Technology 2021年第13期72卷 223-230页

作者： Weichao bao Stuart Robertson Jia-Wei Zhao Ji-Xuan Liu Houzheng Wu guo-jun Zhang Fangfang Xu State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsShanghai 200050China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Institute of Functional MaterialsDonghua UniversityShanghai 201620China Department of Materials Loughborough UniversityLeicestershire LE113TUUnited Kingdom

Ultra-high temperature ceramics have been considered as good candidates for plasma facing materials due to their combination of high melting point,high strength and hardness,high thermal conductivity as well as good chemical *** this study,zirconium diboride has been chosen to investigate its irradiation damage *** by 4 MeV Au^(2+)with a total fluence of 2.5×10^(16)cm^(-2),zirconium diboride ceramic shows substantial resilience to irradiation-induced damage with its structural integrity well maintained but mild damage at lattice *** incident X-ray diffraction evidences no change of the hexagonal structure in the irradiated region but its lattice parameter a increased and c decreased,giving a volume shrinkage of 0.46%.Density functional theory calculation shows that such lattice shrinkage corresponds to a non-stoichiometric compound as *** energy-loss spectroscopy in a transmission electron microscope revealed an increase of valence electrons in zirconium,suggesting boron vacancies were indeed developed by the *** ng the irradiation depth,long dislocations were observed inside top layer with a depth of 750 nm where the implanted Au ions reached the peak *** the top layer,a high density of Frank dislocations is formed by the cascade collision down to a depth of 1150 *** the features show the potential of ZrB_(2) to be used as structural material in nuclear system.

关键词： Zirconium diboride Heavy ion irradiation Boron vacancy Dislocation Structure integration

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Induced neural stem cells regulate microglial activation through Akt-mediated upregulation of CXCR4 and Crry in a mouse model of closed head injury

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Neural Regeneration Research 2025年第5期20卷 1416-1430页

作者： Mou Gao Qin Dong Dan Zou Zhijun Yang Lili guo Ruxiang Xu Department of Neurosurgery Sichuan Academy of Medical Sciences and Sichuan Provincial People’s HospitalSchool of MedicineUniversity of Electronic Science and Technology of ChinaChengduSichuan ProvinceChina Department of Neurosurgery Chinese PLA General HospitalBeijingChina Department of Neurology Fu Xing HospitalCapital Medical UniversityBeijingChina

Microglial activation that occurs rapidly after closed head injury may play important and complex roles in neuroinflammation-associated neuronal damage and *** previously reported that induced neural stem cells can modulate the behavior of activated microglia via CXCL12/CXCR4 signaling,influencing their activation such that they can promote neurological ***,the mechanism of CXCR4 upregulation in induced neural stem cells remains *** this study,we found that nuclear factor-κB activation induced by closed head injury mouse serum in microglia promoted CXCL12 and tumor necrosis factor-αexpression but suppressed insulin-like growth factor-1 ***,recombinant complement receptor 2-conjugated Crry(CR2-Crry)reduced the effects of closed head injury mouse serum-induced nuclear factor-κB activation in microglia and the levels of activated microglia,CXCL12,and tumor necrosis factor-α.Additionally,we observed that,in response to stimulation(including stimulation by CXCL12 secreted by activated microglia),CXCR4 and Crry levels can be upregulated in induced neural stem cells via the interplay among CXCL12/CXCR4,Crry,and Akt signaling to modulate microglial *** agreement with these in vitro experimental results,we found that Akt activation enhanced the immunoregulatory effects of induced neural stem cell grafts on microglial activation,leading to the promotion of neurological recovery via insulin-like growth factor-1 secretion and the neuroprotective effects of induced neural stem cell grafts through CXCR4 and Crry upregulation in the injured cortices of closed head injury ***,these beneficial effects of Akt activation in induced neural stem cells were positively correlated with the therapeutic effects of induced neural stem cells on neuronal injury,cerebral edema,and neurological disorders post–closed head *** conclusion,our findings reveal that Akt activation may enhance the immunoregulatory effects of induced neura

关键词： Akt signaling cerebral edema closed head injury Crry CXCR4 induced neural stem cell microglia neuroinflammation

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Revisiting the sex pheromone of the fall armyworm Spodoptera frugiperda,a new invasive pest in South China

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Insect Science 2022年第3期29卷 865-878页

作者： Nan-Ji Jiang bao-Tong Mo Hao guo jun Yang Rui Tang Chen-Zhu Wang State Key Laboratory of Integrated Management of Pest Insects and Rodents Institute of ZoologyChinese Academy of SciencesBeijing100101China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing100049China

The fall armyworm Spodoptera frugiperda is a worldwide serious agricultural pest,and recently invaded South *** pheromone can be employed to monitor its population dynamics accurately in the ***,the pheromone components previously reported by testing different geographic populations and strains are not *** the basis of confirming that the *** population from Yunnan Province belonged to the com strain,we analyzed the potential sex pheromone components in the pheromone gland extracts of females using gas chromatography coupled with electroan-tennographic detection(GC-EAD),gas chromatography coupled with mass spectrometry(GC-MS)and electroantennography(EAG).The results show that(Z)-9-tetradecenal acetate(Z9-14:Ac),(Z)-11-hexadecenyl acetate(Z11-16:Ac),(Z)-7-dodecenyl acetate(Z7-12:Ac)or(E)-7-dodecenyl acetate(E7-12:Ac)with a ratio of 100:15.8:3.9 induced EAD responses to varying degrees:Z9-14:Ac elicited a strong EAD response,Z7-12:Ac or E7-12:Ac elicited a small but clear EAD response,while Z11-16:Ac elicited a weak EAD *** single sensillum recording(SSR)showed that Z9-14:Ac and Z7-12:Ac induced dose-dependent activities in two types(A and B)of sensilla in male antennae,respectively,while the sensilla in response to E7-12:Ac and Z11-16:Ac was not ***,wind tunnel tests reveal that Z9-14:Ac and Z7-12:Ac are two principal sex pheromone components of the tested population.

关键词： GC-EAD GC-MS sex pheromone single sensillum recording wind tunnel

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Synthesis and Crystal Structure of 5-N-i-Propyl-2-(2′-nitrobenzenesulfonyl)-glutamine

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Chemical Research in Chinese Universities 2006年第6期22卷 760-762页

作者： XIAO Yong-jun WANG Jian-guo WANG bao-lei LI Zheng-ming SONG Hai-bin Elemento-Organic Chemistry Institute State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 P. R. China

The title compound, 5 -N-i-propyl-2-（2＇ -nitrobenzenesulfonyl）-glutamine, was synthesized and its structure was confirmed by IB, MS, ^1H NMB, and elemental analysis. The single crystal structure of the title compound was determined by X-ray diffraction. The crystal belongs to Monoclinic, space group P2（ 1 ）, with a =0. 69281 （ 11 ） nm, b = 0. 76508（12）, c = 1. 5843（3） nm, α=90°, β =90. 941 （3）°, γ =90°, V=0. 8397（2） nm^3, Z =-2, Dc = 1.477 g/cm^3,μ =0. 236 mm^-1, F（000） =392, R =0. 0297, and wR=0.0664.

关键词： 5 -N-i-Propyl-2-( 2' -nitrobenzenesulfonyl) -glutamine Synthesis Crystal structure

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Activation of β_2-Adrenergic Receptor Induced by Three Catecholamine Agonists:a Docking and Molecular Dynamics Study

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Chemical Research in Chinese Universities 2012年第3期28卷 493-499页

作者： ZHANG Rui DONG Li-hua LING bao-ping WANG Zhi-guo LIU Yong-jun Shandong Key Laboratory of Edible Mushroom Technology School of Life SciencesLudong UniversityYantai 264025P.R.China Key Laboratory of Adaptation and Evolution of Plateau Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810008P.R.China School of Chemistry and Chemical Engineering Shandong UniversityJinan 250100P.R.China

We studied the activation of β2-adrenergic receptor（β2AR） by norepinephrine, epinephrine and isoprote- renol using docking and molecular dynamics（MD） simulation. The simulation was done on the assumption that β2AR was surrounded with explicit water and infinite lipid bilayer membrane at body temperature. So the result should be close to that under the physiological conditions. We calculated the structure of binding sites in β2AR for the three ac- tivators. We also simulated the change of the conformation ofβ2AR in the transmembrane regions（TMs）, in the mo- lecular switches, and in the conserved DRY（Aspartic acid, Arginine and Tyrosine） motif. This study provides detailed information concerning the structure ofβ2AR during activation process.

关键词： β2-Adrenergic receptor(β2AR) G Protein coupled receptor(GPCR) Molecular dynamics Agonist Activa-tion

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Automated detection and identification of white-backed planthoppers in paddy fields using image processing

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Journal of Integrative Agriculture 2017年第7期16卷 1547-1557页

作者： YAO Qing CHEN guo-te WANG Zheng ZHANG Chao YANG bao-jun TANG Jian School of Information Science and Technology Zhejiang Sci-Tech University State Key Laboratory of Rice Biology China National Rice Research Institute

A survey of the population densities of rice planthoppers is important for forecasting decisions and efficient control. Tra- ditional manual surveying of rice planthoppers is time-consuming, fatiguing, and subjective. A new three-layer detection method was proposed to detect and identify white-backed planthoppers （WBPHs, Sogatella furcifera （Horvath）） and their developmental stages using image processing. In the first two detection layers, we used an AdaBoost classifier that was trained on a histogram of oriented gradient （HOG） features and a support vector machine （SVM） classifier that was trained on Gabor and Local Binary Pattern （LBP） features to detect WBPHs and remove impurities. We achieved a detection rate of 85.6% and a false detection rate of 10.2%. In the third detection layer, a SVM classifier that was trained on the HOG features was used to identify the different developmental stages of the WBPHs, and we achieved an identification rate of 73.1%, a false identification rate of 23.3%, and a 5.6% false detection rate for the images without WBPHs. The proposed three-layer detection method is feasible and effective for the identification of different developmental stages of planthoppers on rice plants in paddy fields.

关键词： white-backed planthopper developmental stage automated detection and identification image processing histogram of oriented gradient features gabor features local binary pattern features

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Numerical simulation of flash reduction in a drop tube reactor with variable temperatures

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International Journal of Minerals,Metallurgy and Materials 2022年第2期29卷 228-238页

作者： Yiru Yang Qipeng bao Lei guo Zhe Wang Zhancheng guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

A computational fluid dynamics(CFD)model was developed to accurately predict the flash reduction process,which is considered an efficient alternative ironmaking ***-scale experiments were conducted in drop tube reactors to verify the accuracy of the CFD *** reduction degree of ore particles was selected as a critical indicator of model prediction,and the simulated and experimental results were in good *** influencing factors,including the particle size(20–110μm),peak temperature(1250–1550°C),and reductive atmosphere(H_(2)/CO),were also *** height variation lines indicated that small particles(50μm)had a longer residence time(3.6 s)than large *** provided a longer residence time(~1.29 s)than H_(2)(~1.09 s).However,both the experimental and analytical results showed that the reduction degree of particles in CO was significantly lower than that in H2 *** optimum experimental particle size and peak temperature for the preparation of high-quality reduced iron were found to be 50μm and 1350°C in H2 atmosphere,and40μm and 1550°C in CO atmosphere,respectively.

关键词： flash reduction hematite particles drop tube reactor numerical analysis

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Intimately coupled WS_(2) nanosheets in hierarchical hollow carbon nanospheres as the high-performance anode material for lithium-ion storage

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Rare Metals 2022年第4期41卷 1245-1254页

作者： Ze-jun Zhao Yu-Guang Chao Fang Wang Jia-Yi Dai Yi-Fan Qin Xiao-Bing bao Yong Yang Shao-jun guo State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China

Lithium-ion hybrid capacitors(LIHCs)have drawn extensive attention in fleld of energy ***,the absence of appropriate electrode materials with rapid kinetics restricted the overall performance of the ***,hierarchical N,P-codoped hollow car-bon nanospheres coupling with WS_(2) nanosheets(N,P-codoped HCNS/WS_(2)NSs)were fabricated for boosting lithium storage ***,the WS_(2) nanosheets with several layers embedded in the N,P-codoped hollow carbon nanospheres could not only enhance the conduc-tivity of composites,but also provide abundant channels for the rapid transfer of *** a result,as-prepared N,P-codoped HCNS/WS_(2) NSs demonstrated superior rate performance and long-term cycling *** reversible discharge capacity of 725.2 mAh·g^(-1) could be preserved after 1000 cycles at a current density of 1.0 A·g^(-1).Fur-thermore,LIHCs devices were assembled by using N,P-codoped HCNS/WS_(2) NSs and activated carbon(AC)as the cathode and anode,which exhibited high energy density of 166.7 Wh·kg^(-1) and power density of 5312.4 W·kg^(-1).Last but not least,the capacity almost had no obvious deterioration after 6000 cycles at a high current density of 10.0 A·g^(-1).

关键词： N P-Codoped hollow nanospheres WS2 nanosheets Self-assembly Lithiumion anode Lithiumion hybrid capacitors

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Simulation of secondary nucleation of polymer crystallization via a model of microscopic kinetics

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Chinese Chemical Letters 2015年第9期26卷 1105-1108页

作者： Kun-Lun Xu bao-Hua guo Renate Reiter Günter Reiter jun Xua Advanced Materials Laboratory of Ministry of Education Department of Chemical EngineeringTsinghua University Physikalisches Institut and Freiburg Materials Research Center Albert-Ludwigs-Universitt

We present simulations of the mechanism of secondary nucleation of polymer crystallization,based on a new model accounting for the microscopic kinetics of attaching and *** the key feature of the model,we introduced multibody-interaction parameters that establish correlations between the attaching and detaching rate constants and the resulting thickness and width of the crystalline *** MATLAB and Monte Carlo method,we followed the evolution of the secondary nuclei as a function of various multibody-interaction *** identified three different growth progressions of the crystal：（i） Widening,（ii） thickening and（iii） simultaneously thickening and widening of lamellar crystals,controlled by the corresponding kinetic parameters.

关键词： Computer simulation Secondary nucleation Polymer crystallization Monte Carlo simulation Microscopic kinetics model Multi-body interaction

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Relationship between Thermodynamic Parameters for Mn-Fe Melt and Temperature

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Journal of Iron and Steel Research International 2004年第3期11卷 5-10页

作者： CHEN Er-bao DONG Yuan-chi guo Shang-xing WU bao-guo Anhui University of Technology

The carbon solubility in Mn-Fe melts were measured at 1350℃,1375℃,1425℃and 1450 ℃,and accordingly the calculated equations were *** thermodynamic derivation and calculation,some relationships between thermodynamic... 详细信息

关键词： Mn-Fe melt thermodynamic parameter temperature activity interaction coefficient

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