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Effect of pier shape and pier alignment on the equilibrium scour depth at single piers

International Journal of Sediment research 2016年第3期31卷 244-250页

作者： Cristina fael rui Lana António Cardoso Faculdade de Engenharia Universidade da Beira InteriorEdificio Ⅱ das EngenhariasCalcada Fonte da Lameiro Instituto Superior de Engenharia/Universidade do Algarve Instituto Superior Tecnico Universidade de Lisboa

The equilibrium scour depth at uniform single bridge piers depends on a large number of variables,including the pier horizontal cross-section shape and its alignment angle towards the flow *** influence of these variables has been studied by only a few researchers,mostly,on the basis of tests that were far from approaching *** experimental study aims at revisiting the influence of piers’ shape and alignment on local scouring for length-width ratios smaller than or equal to 4,by increasing the experimental *** five long-duration laboratory tests were run under steady,clear-water flow,close to the threshold for initiation of sediment *** pier shapes were considered:circular,rectangular square-nosed,rectangular round-nosed,oblong,and zero-spacing(packed) pile-groups;the tested skew-angles were 0°,30°,45°,60°,and 90°.It was concluded that i) the shape factor can be taken as 1.0,for rectangular round-nosed and oblong cross-section piers,and as 1.2,for rectangular squarenosed and packed pile-group cross-section piers,ii) the shape factor does not vary significantly with the duration of tests,this way confirming the robustness of the shape factors reported to date,iii) the effect of shape is present at skewed piers although the associated coefficients remain in the narrow range of1.0-1.2,and iv) for length-width ratios smaller than 4,the shape factor is of the same order of magnitude as the skew angle factor and should not be neglected.

关键词： Scour Pier shape Pier alignment

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μ和τ的辐射轻子衰变（英文）

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中国科学技术大学学报 2016年第5期46卷 383-391 415,415页

作者： fael M. 伯尔尼大学理论物理学研究所爱因斯坦基础物理研究中心

τ的辐射轻子衰变的精确数据为探测τ的电磁性质提供了机会,而且可能允许确定其除了标准模型精确预言从来没有测量过的反常磁矩.最近,BaBar合作组测量了τ辐射轻子衰变的分支比(τ→lννγ,以l=e,μ).这些约3%的相对误差的精确测量必... 详细信息

τ的辐射轻子衰变的精确数据为探测τ的电磁性质提供了机会,而且可能允许确定其除了标准模型精确预言从来没有测量过的反常磁矩.最近,BaBar合作组测量了τ辐射轻子衰变的分支比(τ→lννγ,以l=e,μ).这些约3%的相对误差的精确测量必须在次领头阶上与QED预言的分支比一致.实际上,对l=e,辐射修正预计在10%量级,对于l=μ大约在3%.这里给出了μ和τ辐射轻子衰变微分衰变率和分支比的标准模型到次领头阶的预测,并与BaBar实验结果比较.此外,给出了在Belle和Belle II测量τ反常磁矩的可行性研究.

关键词：电弱辐射修正 μ衰变 τ衰变电磁矩

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Molecular Screening of rice Cultivated in Benin for the Identification of Xanthomonas oryzae Pv. oryzae and Bacterial Leaf Blight resistance Genes

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Advances in Bioscience and Biotechnology 2023年第12期14卷 514-533页

作者： Chimène Nadège Mahoussi Nanoukon Koffi David Montcho Hambada Antoine Abel Missihoun Kéllya Laurinzo Déguénon Bignon Meyrix Pamela Franzel Loumédjinon Bana Wêtè Déré Félicité Bio Emilienne Zinsou réel Gael fael Houngbélagnon Amed Sèmèvo Havivi Lamine Baba-Moussa Lambert Gustave Djédatin Laboratory of Molecular Biology and Bioinformatics Applied to Genomics National School of Applied Biosciences and Biotechnolo-gies National University of Science Technology Engineering and Mathematics Dassa-Zoumè Benin Laboratory of Molecular Biology and Bioinformatics Applied to Genomics National School of Applied Biosciences and Biotechnologies National University of Science Technology Engineering and Mathematics Dassa-Zoumè Benin Laboratory of Plant Horticultural and Forestry Sciences National University of Agriculture Kétou Benin Laboratory of Molécular Genetics and Genome Analysis Department of Genetics and Biotechnology Faculty of Science and Technology (FAST) University of Abomey-Calavi Cotonou Benin Laboratory of Biology and Molecular Typing in Microbiology Department of Biochemistry and Cell Biology University of Abomey-Calavi Abomey-Calavi Benin

One of the most devastating diseases of rice worldwide is bacterial blight (BLB) caused by Xanthomonas oryzae pv. Oryzae (Xoo). In Benin, Xoo was first described in 2013 on wild rice Oryzae longistaminata. So far, no study has been done on Beninese Xoo strains. We do not know whether the pathogen has already passed into the rice varieties grown, or if they are exposed to other bacteria. Whereas the use of resistant varieties, carrying resistance genes, is the only highly effective and environmentally friendly way to control this disease, no information is available on these Xoo resistance genes in rice varieties grown in Benin apart from the one we recently. This study aims to identify Beninese Xoo strains, causing BLB and screen rice varieties grown in Benin for the main resistance genes. Diseased rice leaves showing typical symptoms of fire blight collected from different rice fields in the three phytogeographic areas of Benin were analyzed by PCr for Xoo-specific sequence identification. Furthermore, seventy-five collected rice accessions were screened to identify xa5, Xa7, xa13, and Xa21 resistance genes to Xoo. The results reveal that Xanthomonas oryzae was identified in two fields in Banikouara and one in Malanville. On the other hand, Sphingomonas sp. has been identified in several other rice fields in Benin. Forty-seven of seventy-five rice accessions examined (62.66%) carried Xoo resistance genes with 3 (4%) and 40 (53.33%) of xa5 and Xa21 respectively. None of the accessions had either Xa7 or xa13 resistance genes. Three accessions possess both xa5 and Xa21 genes. Isogenic lines IrBB60 and IrBB21, supposed to be a positive control, presented a Xoo sensitivity allele. These results indicate that Xoo has moved from the wild rice variety to the cultivated variety in northern Benin and varietal improvement programs must be implemented with varieties having several resistance genes for the efficient response against a possible BLB pandemic in Benin.

关键词： Bacterial Blight Xanthomonas oryzae Pv. oryzae Molecular Characterization resistance Genes

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Molecular Screening of rice Cultivated in Benin for the Identification of Xanthomonas oryzae Pv. oryzae and Bacterial Leaf Blight resistance Genes

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Advances in Bioscience and Biotechnology（生命科学与技术进展） 2023年第12期

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