Based on the capability of controlling low-frequency elastic waves in solids with subwavelength size, locally resonant phononic crystals have potential applications track vibration reduction. By periodically embedding 3D unit cells (LRUCs) a concrete matrix, wave-resistance sleeper negative effective mass density is proposed, and generation mechanism bandgap parameter sensitivity are studied. F...

BACKGROUND The aim of this study was to investigate the influence of body mass index, body weight, lean mass, fat mass, and basal energy expenditure on bone mineral density in postmenopausal women. METHODS This was a cross-sectional, descriptive study of a sample of 50 women, with minimum time since menopause between 1 and 10 years. Bone mineral density was assessed at the lumbar spine (L2-L4...

introduction: of the factors leading to false negative results in mammography is breast tissue density, and by increasing the density of breast tissue in mammography, the mammography sensitivity decreases. on the other hand, increasing the breast tissue density leads to increased risk of breast cancer. various factors such as inheritance, genetics, hormonal and reproductive factors, and nutriti...

In a previous publication, the author discussed electron mass and charge inconsistencies resulting from classical models. A model was proposed using equations two opposite charges to resolve inconsistency. The in that article is modified herein define also resolves positive of outer shell core replaced with negative mass. small negatively-charged at center still has