نتایج جستجو برای: negative mass density

تعداد نتایج: 1344552  

2005
F. I. Cooperstock

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...

Journal: :archives of breast cancer 0
sadaf alipour surgery department, arash women’s hospital, tehran university of medical sciences, tehran, iran and vali-e-asr reproductive health research center, tehran university of medical sciences, tehran, iran ladan hosseini research development center, arash women’s hospital, tehran university of medical sciences, tehran, iran leila bayani radiology department, arash women’s hospital, tehran university of medical sciences, tehran, iran azin saberi surgery department, arash women’s hospital, tehran university of medical sciences, tehran, iran afsaneh alikhassi radiology department, cancer institute, tehran university of medical sciences, tehran, iran

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...

Journal: :international journal of endocrinology and metabolism 0
marjan jeddi endocrine and metabolism research center, department of internal medicine, nemazee hospital, shiraz university of medical sciences, shiraz, ir iran mohammad hossein dabbaghmanesh endocrine and metabolism research center, department of internal medicine, nemazee hospital, shiraz university of medical sciences, shiraz, ir iran; endocrine and metabolism research center, shiraz university of medical sciences, p. o. box: 71345-1414, shiraz, ir iran. tel: +98-7136281569, fax: +987136473096 gholamhossein ranjbar omrani endocrine and metabolism research center, department of internal medicine, nemazee hospital, shiraz university of medical sciences, shiraz, ir iran sayed mohammad taghi ayatollahi department of biostatistics, shiraz university of medical sciences, shiraz, ir iran zahra bagheri department of biostatistics, shiraz university of medical sciences, shiraz, ir iran marzieh bakhshayeshkaram health policy research center, shiraz university of medical sciences, shiraz, ir iran

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...

2015
Fatemeh Alsadat Sabet Reza Majdzadeh Babak Mostafazadeh Davani Kazem Heidari Akbar Soltani

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...

Azadeh Nadjarzadeh, Elham Razmpoosh, Hadiseh Khosravi,

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...

2013
Rini Widyaningrum Sri Lestari

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...

2017
Yangyang Chen Gengkai Hu Guoliang Huang

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 ...

2010
Colin S. Brent

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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