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Impact of typical environments in china’s western mountainous areas on the durability of railway concrete:a review

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Railway sciences 2024年第5期3卷 650-669页

作者： jiahe Wang Yanbin Tan Huajian Li Xinhua Zhong Jiaxuan Wang Yu Gao china academy of Railway sciences Corporation Limited Railway Engineering Research InstitutionBeijingChina and State Key Laboratory of High Speed Railway Track SystemBeijingChina

Purpose–This study aims to analyze the impact mechanism of typical environments in china’s western mountainous areas on the durability of railway concrete and propose measures to improve ***/methodology/approach–With the continuous promotion of infrastructure construction,the focus of china’s railway construction has gradually shifted to the western *** four typical environments of large temperature differences,strong winds and dryness,high cold and low air pressure unique to the western mountainous areas of china have adverse effects on the durability of typical railway structure concrete(bridges,ballastless tracks and tunnels).This study identified the characteristics of four typical environments in the western mountainous areas of china through on-site *** impact mechanism of the four typical environments on the durability of concrete in different structural parts of railways has been explored through theoretical analysis and experimental research;Finally,a strategy for improving the durability of railway concrete suitable for the western mountainous areas of china was ***–The daily temperature difference in the western mountainous areas of china is more than twice that of the plain region,which will lead to significant temperature deformation and stress in the multi-layered structure of railway ballastless *** will result in *** wind speed in the western plateau region is about 2.5 to 3 times that of the plain region,and the average annual rainfall is only 1/5 of that in the plain *** drying effect on the surface of casting concrete will significantly accelerate its cracking process,leading to serious durability *** environmental temperature in the western mountainous areas of china is generally low,and there are more freeze-thaw cycles,which will increase the risk of freeze-thaw damage to railway *** environmental air pressure in the western plateau region is only 60%of that in

关键词： Western mountainous areas Concrete Durability Environment

Mechanical Properties of Interface between U-0.75Ti Alloy and TiC

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International Journal of Minerals,Metallurgy and Materials 1998年第1期12卷 41-43页

作者： Yong Zhang Junpin Lin Guoliang Chen Gengchen Sun Guanxing Li (state key laboratory for Advanced Metals and Materials, UST beijing, beijing 100083, china)(institute of Mechanics Research, Sinica academy of Science, beijing, china)(202 Plane Baotou, C state key laboratory for Advanced Metals and Materials UST Beijing Beijing 100083 China institute of Mechanics Research Sinica Academy of Science Beijing China 202 plant Baotou China

The microhardness and modulus changes of the interface between U-0.75Ti alloy and TiC before andafter heat treatment were studied by SEM and Nano Indenter II, and the results show that the hardness and modulusof the interface are greatly increased after 820℃, 2 h water quenching and 450℃, 6 h aging. This result probablycomes from much more U2Ti and U6Ni precipitates along the interface.

关键词： U-0.75Ti alloy TiC interface hardness and modulus

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Study on the Ultrastructures of Antennal Sensilla in helicoverpa armigera

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Agricultural sciences in china 2002年第8期1卷 896-899页

作者： WANG Gui-rong, GUO Yu-yuan and wu Kong-ming( state key laboratory of plant Disease and Insect Pests, The institute of plant Protection , chinese academy of Agricultural sciences, beijing 100094 , P. R . china ) state key laboratory of plant Disease and Insect Pests The Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100094 P. R . China

The morphology and structures of antennal sensilla of helicoverpa armigera are observed under scanning and transmission electron microscopes. Antennae of helicoverpa armigera are made up of scapus, pedicel and flagellum that the latter consists of 70 - 82 segments. The inner side surface of antenna is cat-aphracted and most of the antennal sensilla lie on its outer, upper and lower surfaces. Both the antennae of male and female contain five kinds of antennal sensilla, namely, sensillum trichodeum, sensillum basicon-icum, sensillum chaeticum, ear-shaped sensillum and sensillum coeloconicum, and the kinds, number and distribution of antennal sensilla of both sexes are similar. There are a large number of serrate cuticular processes on antennal surface, especially on the middle and basic parts of antenna. Sensillum trichodeum and sensillum basiconicum, the main chemical odor receptors on antennae of helicoverpa armigera, consist of cuticular-wall, sheath cells, lymph and dendrites. There are significant differences between the internal structures of the two kinds of sensilla. In sensillum trichodeum, the cuticular-wall is thicker, less lipophilic pore channels and has one or a few dendrites, while in sensillum basiconicum, the cuticular-wall is thinner, abundant lipophilic pore channels and has much more dendrites.

关键词： helicoverpa armigera Antennal sensillum Ultrastructures Scanning electron microscope Transmission electron microscope

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Dynamic Regulation of Histone Methylation in Arabidopsis thaliana

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Dynamic Regulation of Histone Methylation in Arabidopsis tha...

ERAD in plant Hormone and Stress Signaling

2011全国植物生物学研讨会

作者： Xiaofeng Cao state key laboratory of plant genomics and National Center for plant Gene Research,institute of Genetics and Developmental Biology,chinese academy of sciences,beijing 100101,china

Histone lysine methylation plays an essential role in regulating chromatin functions such as transcriptional regulation,DNA methylation and heterochromatin *** methylation marks are dynamically *** findings in mammals have demonstrated that histone methylation is reversible by a family of Jumonji C(JmjC) domain-containing *** showed that JMJ14 is an active histone H3K4 demethylase involved in flowering time *** also

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ERAD in Plant Hormone and Stress Signaling

Screening and docking studies of natural phenolic inhibitors of carbonic anhydrase Ⅱ

植物分子生物学与现代农业——2010全国植物生物学研讨会

作者： Qi Xie state key laboratory of plant genomics,institute of Genetics and Developmental Biology,chinese academy of sciences,beijing,china

The Ubiquitination modification may have diverse effects on the substrate,ranging from proteasome-dependent proteolysis to modulation of protein function,structure, assembly,and/or *** which E3 ligases confer specific... 详细信息

关键词： ERAD ER stress ubiquitin 26S proteasome

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Science china Chemistry 2009年第3期52卷 332-337页

作者： HUANG HuoQiang1, 2, PAN XuLin1, JI ChangJiu1, 2, ZENG GuangZhi1, JIANG LiHua1, FU Xiang1, LIU JiKai1, HAO XiaoJiang1, ZHANG YingJun1 & TAN NingHua1 1 state key laboratory of Phytochemistry and plant Resources in West china, Kunming institute of Botany, chinese academy of sciences, Kunming 650204, china 2 Graduate University of the chinese academy of sciences, beijing 100049, china state key laboratory of Phytochemistry and plant Resources in West china Kunming Institute of Botany Chinese Academy of Sciences Kunming China Graduate University of the chinese academy of sciences Beijing China

Carbonic anhydrase Ⅱ (CAⅡ) is an important enzyme complex with Zn2+,which is involved in many physiological and pathological processes, such as calcification, glaucoma and tumorigenicity. In order to search for novel inhibitors of CAⅡ, inhibition assay of carbonic anhydrase Ⅱ was performed, by which seven natural phenolic compounds, including four phenolics (grifolin, 4-O-methyl-grifolic acid, grifolic acid, and isovanillic acid) and three flavones (eriodictyol, quercetin and puerin A), showed in-hibitory activities against CAⅡ with IC50s in the range of 6.37-71.73 μmol/L. Grifolic acid is the most active one with IC50 of 6.37 μmol/L. These seven phenolic compounds were proved to be novel natural carbonic anhydrase Ⅱ inhibitors, which were obtained in flexible docking study with GOLD 3.0 soft-ware. Results indicated that the aliphatic chain and polar groups of hydroxyl and carboxyl are impor-tant to their inhibitory activities, providing a new insight into study on CA Ⅱ potent inhibitors.

关键词： carbonic anhydraseⅡ natural inhibitors screening docking

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Cloning of a down-regulated gene encoding small GTP binding protein in hybrid wheat

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Progress in Natural Science:Materials International 2005年第7期15卷 621-626页

作者： YAO Yingyin, NI Zhongfu, CheN Rongmin, wu Limin and SUN Qixin (Department of plant Genetic & Breeding, state key laboratory for Agro-biotechnology, china Agricultural University, beijing 100094, china) Department of plant Genetic & Breeding State Key Laboratory for Agro-biotechnology China Agricultural University Beijing 100094 China

Previous studies showed that differential gene expression between wheat hybrids and their parents was responsible for the heterosis. To provide an insight into the molecular basis of wheat heterosis, one cDNA, designated TaRab, was identified from the cDNA library of wheat seedling leaves. The sequence comparison in GenBank revealed that TaRab is homologous to a group of genes encoding Rab-GTP binding protein. Semi-quantitative RT-PCR analysis indicated that TaRab was expressed in all plant tissues examined, but at slightly higher level in leaves. Further analysis exhibited that TaRab displayed lower expression in hybrid than in its patents in both roots and leaves, which was in agreement with the original results of suppression subtractive hybridization. TaRab was located on chromosome 7B and C-7DS5-0.36 by in silico mapping. The relationship between differential expression of TaRab and the molecular basis of wheat heterosis was also discussed.

关键词： wheat Rab protein gene expression heterosis.

Novel phased siRNA pathways in rice

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Novel phased siRNA pathways in rice

LEAFY heAD2,which encodes a putative RNA-binding protein,regulates shoot development of rice

第十一届全国植物基因组学大会

The osdcl4-1 mutant exhibits much more severe developmental defects than dcl4 in Arabidopsis, suggesting that Os DCL4 may process broader substrates in *** deep sequencing of small RNAs from different tissues of wild ...

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Cell Research 2006年第3期16卷 267-276页

作者： Guo Sheng Xiong~(1,3) Xing Ming Hu~2 Yong Qing Jiao~1 Yan Chun Yu~1 Cheng Cai Chu~1 Jia Yang Li~1 Qian Qian~2 Yong Hong Wang~11 state key laboratory of plant genomics and National Center for plant Gene Research,institute of Genetics and Developmental Biology,chinese academy of sciences,beijing 100101,china 2 state key laboratory of Rice Biology,china National Rice Research institute,chinese academy of Agricultural sciences,Hangzhou 310006,china 3 Graduate University of chinese academy of sciences,beijing 100049,china statekeylaboratoryofplantgenomicsandNationalCenterforplantGeneResearch InstituteofGeneticsandDevelopmentalBiologyChineseAcademyofSciencesBeijing100101China

During vegetative development,higher plants continuously form new leaves in regular spatial and temporal *** with abnormal leaf developmental patterns not only provide a great insight into understanding the regulatorymechanism of plant architecture,but also enrich the ways to its modification by which crop yield could be ***,we reported the characterization of the rice leafy-head2 (lhd2) mutant that exhibits shortened plastochron,dwarfism,reduced tiller number,and failure of phase transition from vegetative to reproductive *** and histologicalstudy revealed that the rapid emergence of leaves in lhd2 was resulted from the rapid initiation ofleafprimordia whereasthe reduced tiller number was a consequence of the suppression of the tiller bud *** molecular and geneticanalysis showed that LHD2 encodes a putative RNA binding protein with 67% similarity to maize *** ofgenome-scale expression profiles between wild-type and lhd2 plants suggested that LHD2 may regulate rice shoot devel-opment through KNOXand hormone-related *** similar phenotypes caused by LHD2 mutation and the conservedexpression pattern of LHD2 indicated a conserved mechanism in controlling the temporal leaf initiation in grass.

关键词： phyllotaxy plastochron LHD2 RNA-binding protein stem elongation plant architecture Oryza sativa L