549 research outputs found
A systematic study on the binding energy of hypernuclei
In this paper, we calculated the binding energy per baryon of the
hypernuclei systemically, using the relativistic mean field theory (RMF) in a
statistic frame. Some resemble properties are found among most of the
hypernuclei found in experiments. The data show that a hypernucleus
will be more stable, if it is composed of a hyperon adding to a
stable normal nuclear core, or a hyperon replacing a neutron in a
stable normal nuclear core. According to our calculations, existences of some
new hypernuclei are predicted under the frame of RMF.Comment: 8 pages, 6 figures, 3 table
Influence of Temperature on Typical Texture Distribution in Primary Recrystallization Matrix of 3% Si CGO Silicon Steel
OM (optical microscopy) and EBSD (electron backscatter diffraction) techniques were used to study microstructure and texture distribution during primary recrystallization under different intermediate annealing temperatures in CGO silicon steels. The effect of intermediate annealing temperature on texture distribution in 3% Si electrical steel was analyzed. The results indicate that the microstructure in primary recrystallization matrix of CGO silicon steel is comprised of equiaxed ferrite grains. Mean grain size of primary recrystallization increases with the rising of intermediate annealing temperature. γ-fiber texture is the dominant component in primary recrystallization matrix. With higher intermediate annealing temperature, 111121 texture and 111110 texture increase and 111121 texture is stronger than 111110 texture. Goss texture was observed to be decreased firstly and then increased. The content of high angle grain boundaries in primary recrystallization matrix are affected by intermediate annealing temperature. When intermediate annealing temperature is increased, high angle grain boundaries are increased firstly and then decreased. Misorientation distribution in primary recrystallized matrix is affected by primary recrystallization annealing temperature either. The content of high angle grain boundaries are increased owing to higher primary recrystallization annealing temperature, which can be a benefit to the abnormal growth of Goss grains in secondary recrystallization
Effect of Hot Deformation Temperature on Texture Formation Regularity of CGO Silicon Steel under High Deformation Rate
MnBa2(HPO4)2(H2PO4)2
Crystals of manganese(II) dibarium bis(hydrogenphosphate) bis(dihydrogenphosphate), MnBa2(HPO4)2(H2PO4)2, were obtained by hydrothermal synthesis. The title compound is isotypic with its CdII and CaII analogues. The structure is built up of an infinite {[Mn(HPO4)2(H2PO4)2]4−}n chain running along [100], which consists of alternate MnO6 octahedra and [PO4] tetrahedra, in which the centrosymmetric MnO6 octahedra share their four equatorial O-atom corners with tetrahedral [PO3(OH)] groups and their two axial apices with tetrahedral [PO2(OH)2] groups. These chains are held together by BaO9 coordination polyhedra, developing into a three-dimensional structure. The O—H⋯O hydrogen bonds additionally stabilize the structural set-up. Due to the ionic radius of Mn2+ being much smaller than those of Ca2+ and Cd2+, this may imply that their adopted structure type has a great tolerance for incorporating various ions and the exploitation of more diverse compounds in the future is encouraged
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Structural specializations of , an integrin that mediates rolling adhesion
The lymphocyte homing receptor integrin is unusual for its ability to mediate both rolling and firm adhesion. and are targeted by therapeutics approved for multiple sclerosis and Crohn’s disease. Here, we show by electron microscopy and crystallography how two therapeutic Fabs, a small molecule (RO0505376), and mucosal adhesion molecule-1 (MAdCAM-1) bind α4β7. A long binding groove at the interface for immunoglobulin superfamily domains differs in shape from integrin pockets that bind Arg-Gly-Asp motifs. RO0505376 mimics an Ile/Leu-Asp motif in ligands, and orients differently from Arg-Gly-Asp mimics. A novel auxiliary residue at the metal ion–dependent adhesion site in is essential for binding to MAdCAM-1 in yet swings away when RO0505376 binds. A novel intermediate conformation of the headpiece binds MAdCAM-1 and supports rolling adhesion. Lack of induction of the open headpiece conformation by ligand binding enables rolling adhesion to persist until integrin activation is signaled
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