Spin observables in deuteron–proton radiative capture at intermediate energies

A radiative deuteron–proton capture experiment was carried out at KVI using polarized-deuteron beams at incident energies of 55, 66.5, and 90 MeV/nucleon. Vector and tensor-analyzing powers were obtained for a large angular range. The results are interpreted with the help of Faddeev calculations, which are based on modern two- and three-nucleon potentials. Our data are described well by the calculations, and disagree significantly with the observed tensor anomaly at RCNP.journal articl

堤防越流時に生じる法尻近傍の局所洗掘に関する実験的研究

プロジェクト番号 : A11－48若手展開研究 : カテゴリBtextapplication/pdfresearch repor

砂礫州上樹木の洪水時破壊限界に関与する抗力モーメントと底面せん断力の評価＜研究成果報告＞

This paper reports the research project in Arakawa River and Tamagawa River related to breaking condition of trees vegetated on gravel bars. Field surveys and laboratory experiments were conducted for elucidating the tree breaking condition due to the flood. The river flow analysis is also applied to the Arakawa River for evaluating the tree wash-out condition. The tree breaking and tree wash-out can be evaluated by drag moment acting on the tree trunk and the non-dimensionalized bed shear stress, respectively. The threshold drag moment and shear stress are discussed and the papers are introduced in this manuscript.textapplication/pdfdepartmental bulletin pape

スリランカ南部海岸線におけるインド洋大津波被害実態調査(その２) : 海岸林の破壊限界モーメントに注目して<論文>

This study explored the effects of coastal vegetation and sand dune on tsunami protection based on field observations carried out in two periods after the Indian Ocean tsunami. First one was conducted for elucidating the relationship between the representative species and the damage, from 1 to 6 April 2005 in Sri Lanka. The second survey was conducted for investigating the breaking condition of the representative trees, from 5 to 9 January, 2006 at Kalutra, Medilla, Rekawa and Hambantota where the combination of the sand dune followed by vegetation towards landside played an important role. The breaking moment of trees were investigated for the representative trees by pulling test. The threshold value for breaking condition was derived as a function of trunk diameter. The breaking moment equation represents well in the limitation of the representative species with the tsunami height at the tsunami event considering the aerial root height. These findings have to be considered in future coastal landscape planning and tsunami hazard mapping.textapplication/pdfdepartmental bulletin pape

東日本大震災における津波の河川遡上と越流による被害＜論文＞

The tsunami caused by the Great Japan Earthquake at 14:46 JST on 11 March 2011, with a magnitude of 9.0 and epicenter 129 km east of Sendai, broke most of the sea embankment and coastal vegetation belt and caused catastrophic damage to people and buildings in the Tohoku and Kanto districts of Japan. A field survey was conducted to elucidate the damage situation of residential region by tsunami propagation in river channels and its overtopping from embankment. Abukumagawa River, Nanakita River and Old Kitakamigawa River located on Miyagi prefecture were selected for field investigation. In Abukumagawa River and Old Kitakamigawa River, overtopping flow from embankment occurred mainly at the outer-bank side of meandering section. Severe erosion was occurred on levee slope and neighboring houses were washed out by the scouring due to the overtopping flow. The hinterlands of coast and river had tsunami from two directions, coast and river, and the damage situation including the evacuation action for people became complex. Therefore, it is necessary to elucidate the location where tsunami is easy to be overtopped for different tsunami conditions.textapplication/pdfdepartmental bulletin pape

大型湿地植生の洪水によるダメージと回復過程を考慮した適正洪水導入規模に関する研究<論文>

Field experiment was conducted for elucidating the damage effect on the productivity of wetland species, Phragmites australis, and upland species, Miscanthus sacchariflorus, in a river-floodplain. River flow was analyzed by two-dimensional depth-averaged Reynolds equation to solve the moment acting on the stems. Regrowth dynamic model considering their stem-breaking was formulated and their growth was analyzed in relation to flood discharge, flood interval and their stem-breaking moment. If their stem breaking is occurred every year, survival of the two species is difficult. However, they can survive with 2-5 years’ interval and the superiority of M. sacchariflorus is decreased with stem-breaking condition. However, the breaking moment of M. sacchariflorus was larger than that of P. australis and the decrement in belowground biomass was smaller under bending damage. This indicates that the weak flood does not change their competitive superiority.textapplication/pdfdepartmental bulletin pape

飛沫通過量を最小にする最適防風フェンス構造に関する風洞実験<論文>

For decreasing the spray flux by wave-breaking at the shoreline to the landward area, the optimal wind protection fence structure was discussed. For minimizing the salt-spray flux through the fence, the structure with two low circular or L-shaped cylinders in staggered grid arrangement was selected and wind tunnel experiments were conducted with different spacing for cross-stream and stream-wise direction. The salt spray amount settling at the fence and passing through the fence were measured. The spray volume getting through or blowing up the fence was quantified by colored water with dye. The water was sprayed with a sprayer and collected by gauzes setting at downstream points. For the subsidence volume at the bottom in downstream, a tray was put and the mass of the subsiding water was measured. Considering the loss by blowing upward of the fence, the appropriate arrangement was found as `the two rows of circular cylinders with staggered, 1D cross-stream spacing and 1D-2D stream-wise length, where D is the diameter of a circular cylinder’. This amount of the subsidence is about 90% and more than the value of previous-existed fence structure, 70%.textapplication/pdfdepartmental bulletin pape

実績報告書（論文リスト） 社会環境学部門 ２００９－２０１０（平成２１-２２）年度

49ptextapplication/pdfothe

Observation of mixing-induced CP violation in the neutral B meson system

journal articl

Ductile thin foils of Ni_3Al

application/pdfNi_3Al thin foils with 315 to 357 μm thickness were successfully fabricated by cold rolling. X-ray pole figures showed the formation of {110} rolling textures with various rolling directions in the foils cold rolled over 83% reduction. The deformation microstructure consists of fine slip traces and coarse and wavy shear bands. Banded deformation structure was observed in some foils. In the foils cold rolled to 83% reduction, the Vickers hardness number reached over 600 and the ultimate tensile strength over 1.7 GPa, irrespective of rolling texture and deformation microstructure. The cold rolled foils showed no tensile elongation, but it was possible to bend the foils. The foils recrystallized at temperatures over 1273 K had some tensile ductility (3.0 to 14.6%), though the polycrystalline Ni_3Al is known to be brittle due to severe grain boundary fracture. Electron backscatter diffraction measurements revealed that the large amount of total grain boundary area consists of low angle (LAB) and ∑3 coincidence lattice boundaries. This large fraction is probably a chief cause of the observed ductility.boo