نتایج جستجو برای: negative mass density
تعداد نتایج: 1344552 فیلتر نتایج به سال:
Responses to questions, comments and criticism of our recent paper “General Relativity Resolves..” [1] are provided. It is emphasized that our model is entirely natural to describe the dynamics of an axially symmetric galaxy and that our solution, albeit idealized, contains the essence of the problem. The discontinuity of the metric derivative on the symmetry plane is necessarily interpreted as...
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...
background: mammographic density has been recognized as a risk factor for breast cancer, but the association between potential effective factors and mammographic density has not been fully studied in asian women. we conducted a study to investigate the association of mammographic breast density with several menstrual and reproductive characteristics. m ethods: screening mammography wa...
relative importance of lean and fat mass on bone mineral density in iranian children and adolescents
conclusions these findings suggest that lean mass was the most important predictor of bmd in both genders. physical activity appears to positively impact on lean mass and needs to be considered in physical education and health-enhancing programs in iranian school children. background body weight is made up of lean and fat mass and both are involved in growth and development. impression of these...
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...
PURPOSE To propose an evidence based diagnostic algorithm using mass characteristics to determine malignancy in patients with adrenal incidentaloma by CTscan. METHODS A systematic review in Medline, Scopus, relevant reference books and desk searching was performed up to January 2016 with relevant reference checking. The summery estimates of sensitivity, specificity, positive and negative like...
Background: Malnutrition in children including lower nutrient intakes or high density food intakes is of recent world concerns; therefore, determining a simple index that reveals the diet adequacy might be an advantage. Methods: This cross-sectional study was done among 233 children aged 2-5 years old. A 24-hour dietary questionnaire was used to calculate mean adequacy ratio (MAR), naturally nu...
Osteoporosis is a common metabolic disease characterized by low bone mass density. It affects both trabecular and cortical bone. Bone density is an important determinant which plays a vital role in the success of dental implant and denture treatment. A study to determine correlation between mandible trabecullar bone texture parameter with bone mass density value has been done. Samples of this s...
Achieving vibration and/or wave attenuation with locally resonant metamaterials has attracted a great deal of attention due to their frequency dependent negative effective mass density. Moreover, adaptive phononic crystals with shunted piezoelectric patches have also demonstrated a tunable wave attenuation mechanism by controlling electric circuits to achieve a negative effective stiffness. In ...
The western tarnished plant bug Lygus hesperus Knight (Heteroptera: Miridae), a major pest of cotton and other key economic crops, was tested for its sensitivity to population density during nymph and adult stages. Nymphs reared to adulthood under increasing densities in laboratory conditions exhibited incremental delays in maturation, heightened mortality rates, and reductions in body mass and...
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