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Moment Redistribution Effect of the Continuous Glass Fiber Reinforced Polymer-Concrete Composite Slabs Based on Static Loading Experiment

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Structural Durability & Health Monitoring 2025年第1期19卷 105-123页

作者： Zhao-Jun Zhang Wen-Wei Wang jing-Shui Zhen Bo-Cheng li De-Cheng Cai Yang-Yang Du Hui Huang Offshore Oil Engineering Co.Ltd. Tianjin300461China Department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China

This study aimed to investigate the moment redistribution in continuous glass fiber reinforced polymer(GFRP)-concrete composite slabs caused by concrete cracking and steel bar yielding in the negative bending moment *** experimental bending moment redistribution test was conducted on continuous GFRP-concrete composite slabs,and a calculation method based on the conjugate beam method was *** composite slabs were formed by combining GFRP profiles with a concrete layer and supported on steel beams to create two-span continuous composite slab *** methods,epoxy resin bonding,and stud connection,were used to connect the composite slabs with the steel *** experimental findings showed that the specimen connected with epoxy resin exhibited two moments redistribution phenomena during the loading process:concrete cracking and steel bar yielding at the internal *** contrast,the composite slab connected with steel beams by studs exhibited only one-moment redistribution phenomenon throughout the loading *** the concrete at the internal support cracked,the bending moment decreased in the internal support section and increased in the midspan *** the steel bars yielded,the bending moment further decreased in the internal support section and increased in the mid-span *** GFRP profiles do not experience cracking,there was no significant decrease in the bending moment of the mid-span *** test specimens experienced compressive failure of concrete at the mid-span *** results showed good agreement between the calculated and experimental values of bending moments in the mid-span section and internal support *** proposed model can effectively predict the moment redistribution behavior of continuous GFRP-concrete composite slabs.

关键词： Moment redistribution GFRP-concrete composite slabs bending moment experimental study analysis model

Neuronal changes in the retinal ganglion cell layer following recombinant human interleukin-2 intravitreal injection in a rat model of chronically elevated intraocular pressure

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Neural Regeneration Research 2010年第24期5卷 1888-1894页

作者： Ning li jing Wang xuan Zou Juanlian Cui xuanchu Duan Department of Ophthalmology Second Xiangya Hospital Central South University Changsha 410011 Hunan Province China

Intraperitoneal injection of recombinant human interleukin-2（rhIL-2）inhibits neuronal apoptosis in the chronic ocular hypertension retinal ganglion cell *** injection was performed on retinal ganglion cells in a Wistar rat model of chronically elevated intraocular pressure to observe the effects of LY294002 and AG490 on retinal ganglion cell survival,macrophage activation,and PI3K/Akt and JAK/STAT *** number of retinal ganglion cells in the rhIL-2 treatment group was much greater than in the normal control and phosphate-buffered saline *** blot analysis revealed low Akt and STAT3 protein expression in the retina after 3-hour intravitreous injections of ***,protein expression was increased at 12 hours,but decreased again at 24 hours,with very low expression at 96 ***294002 and AG490,which are inhibitors of the PI3K/Akt and JAK/STAT3 signal pathways,prevented upregulation of Akt and STAT3 protein expression in the retina,*** injection of rhIL-2 exhibited neuroprotective effects by decreasing retinal ganglion cell layer damage in a rat model of chronic *** results suggest that intravitreal injection of rhIL-2 could induce the PI3K/Akt and JAK/STAT3 signaling pathways to protect retinal ganglion cells in chronically elevated intraocular pressure models.

关键词： glaucoma neuroprotection signal pathway recombinant human interleukin-2 retinal ganglion cells

Experimental investigation of propagation mechanisms and fracture morphology for coalbed methane reservoirs

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Petroleum Science 2018年第4期15卷 815-829页

作者： Chi Ai Xiao-xuan li Jun Zhang Dan Jia Wen-jing Tan College of Petroleum Engineering Northeast Petroleum University College of Geoscience and Technology China University of Petroleum (East China)

Fracture propagation mechanisms in coalbed methane(CBM) reservoirs are very complex due to the development of the internal cleat system. In this paper, the characteristics of initiation and propagation of hydraulic fractures in coal specimens at different angles between the face cleat and the maximum horizontal principal stress were investigated with hydraulic fracturing tests. The results indicate that the interactions between the hydraulic fractures and the cleat system have a major effect on fracture networks. "Step-like’’ fractures were formed in most experiments due to the existence of discontinuous butt cleats. The hydraulic fractures were more likely to divert or propagate along the butt cleat with an increase in the angles and a decrease in the horizontal principal stress difference. An increase in the injection rate and a decrease in the fracturing fluid viscosity were more conducive to fracture networks. In addition, the influence on fracture propagation of the residual coal fines in the wellbore was also studied. The existence of coal fines was an obstacle in fracturing, and no effective connection can be formed between fractures. The experimental investigation revealed the fracture propagation mechanisms and can provide guidance for hydraulic fracturing design of CBM reservoirs.

关键词： Coalbed methane reservoir Butt cleat Propagation mechanisms Fracture morphology Step-like fractures

Heat Transfer Investigation and Modeling of Heat Integrated Distillation Column

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China Petroleum Processing & Petrochemical Technology 2018年第3期20卷 96-105页

作者： Fang jing Wang Yijing Su Weiyi xuan Bihan li Chunli School of Chemical Engineering Hebei University of Technology

The high degree of reversibility of heat integrated distillation column(HIDiC) has been thermodynamically interpreted by the entropy method. In this paper, a heat transfer model and a more universal method were proposed, through which the overall heat transfer coefficient at different height of column under different operating conditions could be obtained before the experiment. Then the separation of a binary ethanol-water system was carried out experimentally as a case study to verify the heat transfer model and the aforementioned calculation method. The close results between the calculation, the simulation, and the experiments suggested that the proposed model and the calculation method in this paper were accurate and applicable. Meanwhile, it was demonstrated that the HIDiC shows obvious effect of reducing entropy increase and improving thermodynamic efficiency as compared to conventional distillation column.

关键词： heat integrated distillation column heat transfer model separation process

Fabrication and Characterization of Chitosan-Silk Fibroin/Hydroxyapatite Composites via in situ Precipitation for Bone Tissue Engineering

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Chinese Journal of Polymer Science 2015年第12期33卷 1661-1671页

作者： jing-xiao Hu xuan Cai Shao-bo Mo li Chen Xin-yu Shen 童华 Key Laboratory of Analytical Chemistry for Biology and Medicine Ministry of Education College of Chemistry and Molecular Sciences Wuhan University

Homogeneous chitosan-silk fibroin/hydroxyapatite （CS-SF/HA） composites were prepared by in situ precipitation method driven by a multiple-order template. The morphology of the composites was investigated by scanning electron microscope （SEM） and transmission electron microscope （TEM）. The compositional analysis was carried out by X-ray diffraction analysis （XRD） and Fourier transformed infrared spectroscopy （FTIR）. The mechanical properties and biocompatibility of the composites were also determined. The results indicated that the inorganic particles of uniform size （50 nm） were well-dispersed among the CS-SF matrices. The compressive modulus of the CS-SF/HA composites was enhanced with the increasing amount of SF. The in vitro results suggested that the MC3T3-E1 osteoblast-like cells on CS-SF/HA composite disks displayed strong bonding and spreading, and the cell proliferation cultured on each composite disk increased throughout the culture period for up to 7 days. Especially, the samples with higher content of SF had much better biological properties. The evidences proved that the CS-SF/HA composites possessed excellent biocompatibility. By using the freeze-drying technique, hierarchical porous scaffolds with pores ranging from 50 μm to 200 μm were obtained. This work presented the advantages of in situ precipitation method to prepare the organic/inorganic composites, and a multiple-order template was introduced in the system to improve the properties of the composites by combining the merits of each organic template.

关键词： Composites In situ precipitation Biocompatibility Mechanical properties.

Characterization of Ppd-D1 alleles on the developmental traits and rhythmic expression of photoperiod genes in common wheat

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Journal of Integrative Agriculture 2016年第3期15卷 502-511页

作者： ZHAO Yong-ying WANG Xiang WEI li WANG jing-xuan YIN Jun National Engineering Research Center for Wheat Collaborative Innovation Center of Henan Grain CropsState Key Laboratory of Wheat and Maize Crop ScienceCollege of AgricultureHenan Agricultural UniversityZhengzhou 450002P.R.China National Laboratory of Wheat Engineering Key Laboratory of Wheat Biology and Genetic Breeding in Central Huang-Huai RegionMinistry of AgriculturalKey Laboratory of Wheat Biology of Henan ProvinceWheat Research InstitutionHenan Academy of Agricultural SciencesZhengzhou 450002P.R.China

Photoperiodic response is an important characteristic that plays an important role in plant adaptability for various environments. Wheat cultivars grow widely and have high yield potential for the strong photoperiod adaptibility. To assess the photoperiodic response of different genotypes in wheat cultivars, the photoperiodic effects of the Ppd-D1 alleles and the expressions of the related TaGI, TaCO and Ta FT genes in liaochun 10 and Ningchun 36 were investigated under the short-day（6 h light, SD）, moderate-day（12 h light, MD） and long-day（24 h light, LD） conditions. Amplicon length comparison indicated that the promoter of Ppd-D1 in Ningchun 36 is intact, while liaochun 10 presented the partial sequence deletion of Ppd-D1 promoter. The durations of all developmental stages of the two cultivars were reduced by subjection to an extended photoperiod, except for the stamen and pistil differentiation stage in the liaochun 10 cultivar. The expression levels of the Ppd-D1 alleles and the TaGI, TaCO and TaFT genes associated with the photoperiod pathway were examined over a 24-h period under SD and MD conditions. The relationships of different photoperiodic responses of the two cultivars and the expression of photoperiod pathway genes were analyzed accordingly. The photoperiod insensitive（PI） genotype plants flower early under SD; meanwhile, the abnormal expression of the Ppd-D1 a allele is accompanied with an increase in Ta FT1 expression and the TaCO expression variation. The results would facilitate molecular breeding in wheat.

关键词： wheat photoperiod spike differentiation heading gene expression Ppd-D1

Solvent-free Synthesis of Flowable Carbon Clusters with Customizable Size and Tunable Optical Performance

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Chinese Journal of Chemistry 2013年第12期31卷 1513-1518页

作者： Denian li Qi li xuan Hu jing Huang Hairong li lijie Dong HaJan Xie Chuanxi Xiong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materiah' Science and Engineering Wuhan University of Technology Wuhan Hubei 430070 China School of Materials Science and Engineering Wuhan Textile University Wuhan Hubei 430073 China

We propose a rapid and solvent-flee route for synthesizing luminous carbon clusters by controlling carbonization of polyethylene glycol （PEG）. This approach does not involve solvents yet uses the precursor itself as suspend- ing medium, thus features mild and green chemistry, and also enables the formation of uniform-sized carbon clus- ters, of which the diameter can be easily tuned from 0.7 to 3.5 nm via control of reaction time. In term of the di- mension, the resultants are denoted as sub-nano carbon clusters （SNCs） and carbon dots （CDs）, respectively. Bene- fiting from surface anchored PEG segments, both of the two show favorable flowability at room temperature and excellent solubility in aqueous and organic solvents. Comparison of their optical performances and structures re- veals that they share the same chromophores. Particularly, the SNCs demonstrate robust photo- and pH-stable pho- toluminescence and can be directly applied to cell-imaging regarding to its prominent biocompatibility. Moreover, its quantum yield （5.5%）, which is approximately 3 times higher than that of CDs （1.5%）, can be dramatically en- hanced to 18.8% by facile chemical reduction. We anticipate that these PEG derivatives marked with easy synthesis, controllable optical performances and excellent physical properties will be highly appealing in future applications.

关键词： solvent-free synthesis carbon clusters customizable size fluorescence

Nanocomposites based on lanthanide-doped upconversion nanoparticles:diverse designs and applications

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light(Science & Applications) 2022年第8期11卷 1730-1752页

作者： Kaimin Du jing Feng xuan Gao Hongjie Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022JilinChina State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of Science116023DalianChina University of Science and Technology of China HefeiAnhui230026China Department of Chemistry Tsinghua University100084BeijingChina

Lanthanide-doped upconversion nanoparticles(UCNPs)have aroused extraordinary interest due to the unique physical and chemical *** UCNPs with other functional materials to construct nanocomposites and achieve synergistic effect abound recently,and the resulting nanocomposites have shown great potentials in various fields based on the specific design and *** review presents a summary of diverse designs and synthesis strategies of UCNPs-based nanocomposites,including self-assembly,in-situ growth and epitaxial growth,as well as the emerging applications in bioimaging,cancer treatments,anti-counterfeiting,and photocatalytic *** then discuss the challenges,opportunities,and development tendency for developing UCNPs-based nanocomposites.

关键词： properties. lanthanide synergistic

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一种适合工业化生产的溴甲纳曲酮的制备方法

广东化工 2016年第22期43卷 28-29页

作者：徐溶熔罗宏军宣景安李国贤梅来宝南京工业大学江苏南京210000 扬子江药业集团有限公司江苏泰州225300

以盐酸纳曲酮为原料,先用乙酸酐保护其酚羟基,再和溴甲烷进行N-甲基化反应,所得反应物再用氢溴酸水解得到溴甲纳曲酮,总收率35%,HPLC纯度大于99.9%,该制备方法操作简单,适合工业化生产。

关键词：溴甲纳曲酮便秘合成