background: the aim of this study was to investigate vertebral geometry changes and determine cutoff value of vertebral height to predict fractures. methods: in a cross-sectional study, 280 postmenopausal women recruited .in all subjects bone mineral density and radiog raphy of the lumbar spine performed. lateral radiographs were evaluated for identification of vertebral fractures, using a vali...

Nonlinear responses in condensed matters attract recent intensive interest because they provide rich information about the materials and hold possibility of being applied diodes or high-frequency optical devices. are often closely related to multiband nature system which can be taken into account by geometric quantities such as Berry curvature shown nonlinear Hall effect. Theoretically, semi-cl...