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Bending Strength of Glass Materials under Strong Dynamic Impact and Its Strain Rate Effects

Journal of Wuhan University of Technology(Materials Science) 2024年第6期39卷 1358-1364页

作者： LIU Xiaogen QI shuang WEI Shaoshan WAN Detian jin Chunxia China Building Materials Academy The State Key Laboratory of Green Building MaterialsBeijing 100024China School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Based on the structural characteristics of the high-speed loading tester,a four-point bending test device was designed to carry out the four-point bending strength test of glass under the action of static load and different impact velocities,and the formulae for calculating the maximum dynamic stress and strain rate of glass specimens under the action of impact loads were *** experimental results show that the bending strength values of the glass under dynamic impact loading are all higher than those under static *** the increase of impact speed,the bending strength value of glass specimens generally tends to increase,and the bending strength value increases more obviously when the impact speed exceeds 0.5 m/s or *** increasing the impact velocity,higher tensile strain rate of glass specimens can be obtained because the load action time becomes *** bending strength of the glass material increases with its tensile strain rate,and when the tensile strain rate is between 0 and 2 s^(-1),the bending strength of the glass specimen grows more obviously with the strain rate,indicating that the glass bending strength is particularly sensitive to the tensile strain rate in this *** the strain rate increases,the number of cracks formed after glass breakage increases significantly,thus requiring more energy to drive the crack formation and expansion,and showing the strain rate effect of bending strength at the macroscopic *** results of the study can provide a reference for the load bearing and structural design of glass materials under dynamic loading.

关键词： glass materials strong dynamic impact bending strength strain rate effect dynamic enhancement factor

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黄芩苷与苦参碱分子间相互作用的量子化学计算与验证

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原子与分子物理学报 2025年第4期42卷 8-14页

作者：董志舒启江田爽王皎侯安国王文苹云南中医药大学中药学院云南省南药可持续利用重点实验室昆明650500

为探究苦参碱能极大增强黄芩苷在水中的溶解度的原因,采用量子计算对二者反应过程及共存状态进行分析,并使用单晶衍射和红外图谱验证计算结果.本研究表明,黄芩苷和苦参碱并非简单的以非共价作用相结合,二者存在质子转移现象,反应生成黄... 详细信息

为探究苦参碱能极大增强黄芩苷在水中的溶解度的原因,采用量子计算对二者反应过程及共存状态进行分析,并使用单晶衍射和红外图谱验证计算结果.本研究表明,黄芩苷和苦参碱并非简单的以非共价作用相结合,二者存在质子转移现象,反应生成黄芩苷阴离子和苦参碱阳离子,以静电作用为主导形成共无定型物,导致水溶性极大增加.

关键词：苦参碱黄芩苷质子转移离子共无定型物

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Identification of the gain system with quantized observations and bounded persistent excitations

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Science China(Information Sciences) 2014年第1期57卷 217-231页

作者： guo jin ZHAO YanLong Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems ScienceChinese Academy of Sciences

System identification with quantized observations and persistent excitations is a fundamental and difcult *** the first step,this paper takes the gain system for example to investigate the identification with quantized observations and bounded persistently exciting ***,the identification with single threshold quantization is considered.A projection recursive algorithm is proposed to estimate the unknown *** use of the conditional expectation of quantized observations with respect to the estimates,the algorithm is shown to be both mean-square and almost surely *** upper bound of the convergence rate is also obtained,which has the same order as the one of the optimal estimation in the case where the system output is exactly ***,for the multi-threshold quantization,the identification algorithm is similarly constructed and its asymptotic property is *** a multi-linear transformation,the optimal scheme of quantization values and thresholds is given.A numerical example is simulated to demonstrate the efectiveness of the algorithms and the main results obtained.

关键词： system identification quantized observation bounded persistent excitation binary-valued output multi-threshold quantization convergence convergence rate

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Pyrene partition behavior to the NOM:Effect of NOM characteristics and its modification by ozone preoxidation

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Frontiers of Environmental Science & Engineering 2009年第1期3卷 56-61页

作者： jin guo Jun MA School of Environmental and Energy Engineering Beijing University of TechnologyBeijing 100124China School of Municipal and Environmental Engineering Harbin Institute of TechnologyHarbin 150090China

Hydrophobic organic contaminants(HOCs)—pyrene,and natural organic matters(NOM)from different sources were taken as the test compounds to investigate the impact of physicochemical characteristics of NOM on HOCs’partition to the NOM in this *** effects of solution property,NOM characteristics,and modification by ozone preoxidation on pyrene partition to NOM were systematically *** to the fluorescence quenching method,the partition coefficient K_(oc) of pyrene to NOM was calculated,which was found to have a great relationship with the aromatic structures and hydrophobic functional groups of the *** NOM characteristic modification corresponding to solution property could influence the interactions between the NOM and *** could destroy the aromatic or hydrophobic structures of the NOM and decrease K_(oc) of pyrene.

关键词： natural organic matters(NOM) pyrene partition coefficient ozone

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Graph Properties and Stratified Presentations of Partially Ordered Sets

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Algebra Colloquium 2016年第1期23卷 51-63页

作者： jin guo Tongsuo Wu Department of Mathematics Shanghai Jiaotong University Shanghai 200240 China

In this paper, we introduce some new definitions such as the U＊L＊ condition to describe the zero-divisor graph G = F（P） of a poser P, and give a new and quick proof to a main result in [2, 4]. By deleting a typical vertex with least degree, we provide an algorithm for finding a maximum clique of a finite graph G. We study some properties of the zero-divisor graphs of posets concerning diameters and girths. We also provide stratified presentations of posets.

关键词： poset chromatic number clique number deleting method stratified presentation

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MD Simulation of Diffusion Behaviors in Collision Welding Processes of Al-Cu, Al-Al, Cu-Cu

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Computers, Materials & Continua 2024年第6期79卷 3455-3468页

作者： Dingyi jin guo Wei School of Intelligent Manufacturing Hunan First Normal UniversityChangsha410082China School of Physics and Technology Center for Ion Beam ApplicationHubei Nuclear Solid Physics Key LaboratoryWuhan UniversityWuhan430072China

To investigate the effects of material combinations and velocity conditions on atomic diffusion behavior near collision interfaces,this study simulates the atomic diffusion behavior near collision interfaces in Cu-Al,Al-Al and Cu-Cu combinations fabricated through collision welding using molecular dynamic(MD)*** atomic diffusion behaviors are compared between similar metal combinations(Al-Al,Cu-Cu)and dissimilar metal combinations(Al-Cu).By combining the simulation results and classical diffusion theory,the diffusion coefficients for similar and dissimilar metal material combinations under different velocity conditions are *** effects of material combinations and collision velocity on diffusion behaviors are also *** diffusion behaviors of dissimilar material combinations strongly depend on the transverse velocity,whereas those of the similar material combinations are more dependent on the longitudinal *** findings can provide guidance for optimizing welding parameters.

关键词： Atomic diffusion behavior molecular dynamics collision welding

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Unbound^(28)O,the heaviest oxygen isotope observed:a cutting-edge probe for testing nuclear models

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Nuclear Science and Techniques 2024年第2期35卷 1-2页

作者： Jian-guo Li Bai-Shan Hu shuang Zhang Fu-Rong Xu School of Physics and State Key Laboratory of Nuclear Physics and TechnologyPeking UniversityBeijing 100871China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

The beyond-dripline oxygen isotopes^(27,28)O were recently observed at RIKEN,and were found to be unbound decaying into^(24)O by emitting *** unbound feature of the heaviest oxygen isotope,^(28)O,provides an excellent test for stateof-the-art nuclear *** atomic nucleus is a self-organized quantum manybody system comprising specific numbers of protons Z and neutrons N.

关键词： testing quantum system

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Synthesis and Characterization of S,N-Heteroacenes by Bischler-Napieralski Reaction

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Chinese Journal of Polymer Science 2016年第11期34卷 1319-1329页

作者： Hong-shuang guo Mei-fang Liu Yi Han 韩生陈于蓝 School of Chemical and Environmental Engineering Shanghai Institute of Technology Shanghai 201418 China Tianjin Key Laboratory of Molecular Optoelectronic Science Tianjin University Tianjin 300072 China Department of Chemistry Weifang University Weifang 261061 China

Bischler-Napieralski cyclization has been successfully employed to prepare planar S,N-heteroacenes（SNHs） with the analogue structures to 1,10-phenanthroline. The opto-/electrical properties and the packing modes of these S,Nheteroacenes were examined, which were dependent on the structure of the fused groups. SNH-based copolymers with high molecular weight and good solubility in common organic solvents or water have been synthesized by Suzuki-MiyauraSchlüter polycondensation. The photophysical property studies revealed that the copolymers may be a promising chemosensor material.

关键词： solubility conjugated fused cyclization prepare packing chloroform dilute analogue diamine

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Isolation and characterization of ferrous-and sulfur-oxidizing bacteria from Tengchong solfataric region,China

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Journal of Environmental Sciences 2009年第9期21卷 1247-1252页

作者： JIANG Chengying LIU Ying LIU Yanyang guo Xu LIU shuang-Jiang State Key Laboratory of Microbial Resources Institute of Microbiology Chinese Academy of Sciences Beijing 100101 China. Biomaterial & Biocatalyst Group Temasek Life Sciences Laboratory National University of Singapore Singapore 117604 Singapore.

Microbial oxidation and reduction of iron and sulfur are important parts of biogeochemical cycles in acidic environments such as geothermal solfataric regions. Species of Acidithiobacillus and Leptospirillum are the common ferrous-iron and sulfur oxidizers from such environments. This study focused on the Tengchong sofataric region, located in Yunnan Province, Southwest China. Based on cultivation, 9 strains that grow on ferrous-iron and sulfuric compounds were obtained. Analysis of 16S rRNA genes of the 9 strains indicated that they were affiliated to AcidithiobaciUus, Alicyclobacillus, Sulfobacillus, Leptospirillum and Acidiphilium. Physiological and phylogenetic studies indicated that two strains （TC-34 and TC-71） might represent two novel members of Alicyclobacillus. Strain TC-34 and TC-71 showed 94.8%-97.1% 16S rRNA gene identities to other species of Alicyclobacillus. Different from the previously described Alicyclobacillus species, strains TC-34 and TC-71 were mesophilic and their cellular fatty acids do not contain w-cyclic fatty acids. Strain TC-71 was obligately dependent on ferrous-iron for growth. It was concluded that the ferrous-iron oxidizers were diversified and Alicyclobacillus species were proposed to take part in biochemical geocycling of iron in the Tengchong solfataric region.

关键词： ferrous-iron oxidation sulfur oxidation biogeochemical cycle Alicyclobacillus, solfataric region

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Rheological Behaviors of a Series of Hyperbranched Polyethers

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Chinese Journal of Polymer Science 2015年第11期33卷 1574-1585页

作者： Xue-pei Miao Yan-shuang guo Li-fan He 孟焱李效玉 Key Laboratory of Carbon Fiber and Functional Polymers Ministry of Education Beijing University of Chemical Technology TA Instruments-Waters LLC (Beijing) 9/F Tongniu International Manson State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology

Hyperbranched polyethers with different structures and molecular weights（MW） were synthesized using the A2＋B3 approach by varying monomer ratio, A2 structure, and reaction time. Effects of backbone structure and MW on melt rheological behaviors were investigated by both small amplitude oscillatory shear and steady shear measurements. Master curves were constructed using the time-temperature superposition principle and compared. In the reduced frequency range covered, lg G″-lg（ω·aT） always show a slope of 1.0, suggesting a terminal zone behavior; in contrast, unexpected step changes or plateaus are observed on lg G′ master curves. Effects of backbone structure and MW on master curves were discussed. The Cox-Merz rule was tested at different temperatures and was found to be applicable when flow instability was absent.

关键词： Hyperbranched polyethers Rheology Time-temperature superposition

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