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Evaluation of horizontal and moment bearing capacities of tripod bucket foundations in sand
Tran, N.X.,Hung, L.C.,Kim, S.R. Pergamon Press 2017 Ocean engineering Vol.140 No.-
Bearing capacities of tripod bucket foundations differ from those of single bucket foundations because of the interaction among individual buckets of the tripod. This study analyzed the bearing capacities of tripod bucket foundations in medium and dense sands by performing a series of 3D finite element analyses. The sandy soil was modeled by using an elasto-plastic model following the Mohr-Coulomb failure criterion. The Young's modulus of the sands increased with depth because of the stress-dependency of the modulus. Parametric studies were performed, in which the spacing between each bucket, the embedded depth of the bucket, the bucket diameter, and the magnitude of vertical loading were varied. Results showed that the horizontal bearing capacities of tripod bucket foundations reached the maximum values at a spacing ratio of S/D=1.5 to 3.5 for the foundation with an embedment ratio of L/D=0.5 to 1 (where S is the bucket spacing, D is the bucket diameter, and L is the skirt length of the tripod bucket). However, the moment bearing capacities increased linearly as the S/D ratios increased. Finally, bearing capacity equations were proposed in consideration of bucket spacing, embedment depth, effect of foundation diameter and vertical load, and soil density.
On a combination of ground-hook controllers for semi-active tuned mass dampers
L. D. Viet,N. B. Nghi,N. N. Hieu,D. T. Hung,N. N. Linh,L. X. Hung 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
This study proposes a semi-active on-off damping controller that is a mix of three conventional ground-hook controllers for semiactivetuned mass damper systems. Three conventional ground-hook controllers are shown to be effective only in a certain frequencyrange. By taking advantage of all three ground-hook controllers, the mixed controller shows its better performance. More-over, we foundan analytical solution of the harmonic vibration of the semi-active controlled system. The accuracy of the analytical solution and thesuperior performance of the proposed controller are verified by the numerical simulations.
Linh, L.-H.,Hang, N.-T.,Jin, F.-X.,Kang, K.-H.,Lee, Y.-T.,Kwon, S.-J.,Ahn, S.-N. Blackwell Publishing Ltd 2008 Plant breeding Vol.127 No.3
<P>Abstract</P><P>A new QTL for spikelets per panicle (SPP) was detected on the long arm of chromosome 7 in an F<SUB>2</SUB> population derived from a cross between the <I>japonica</I> cultivar Hwaseongbyeo and WH29001. WH29001, an advanced backcross line was developed by introgressing chromosomal segments from an accession of <I>O</I>.<I> minuta</I> (2n = 48, BBCC, Acc. no. 101141) into the <I>O. sativa</I> subsp. <I>japonica</I> cv. Hwaseongbyeo. The <I>O. minuta</I> allele increased SPP in the Hwaseongbyeo background despite the fact that <I>O. minuta</I> was the small panicle parent. Using F<SUB>3</SUB> and F<SUB>4</SUB> progenies, <I>spp7</I> was validated and mapped to a 2.3 Mb region in the interval between the SSR markers RM445 and RM21615 based on the japonica genome sequence. A yield trial using F<SUB>4</SUB> lines indicated that the lines carrying an <I>O. minuta</I> chromosome segment across the entire <I>spp7</I> target region out-yielded its sister lines containing Hwaseongbyeo chromosome in the target region and Hwaseongbyeo by 14.3% and 15.9%, respectively. Increase in SPP in WH29001 was mainly because of the increase in primary branches per panicle. The locus, <I>spp7</I> is of particular interest because of its independence from undesirable height and flowering time. SSR markers tightly linked to the <I>spp7</I> will facilitate cloning of the gene underlying this QTL as well as marker-assisted selection for variation in SPP in an applied breeding program.</P>