نتایج جستجو برای: line of mass
تعداد نتایج: 21229303 فیلتر نتایج به سال:
We analyze UV spectra for a large sample of 578 type 1 active galactic nuclei and derive Eddington ratios, L=LEdd, from the bolometric luminosities and emission-line widths for each object in the sample. The sample spans 5 orders of magnitude in supermassive black hole (SMBH) mass, 7 orders of magnitude in luminosity, and a redshift range 0 z 5. We include a sample of 26 low-redshift narrow-lin...
Background: Centaurea cyanus is an endemic and well-known herbal medicine in Iran, is an annual flowering plant in the family of Asteraceae. The flowers are the part used in modern herbal medicine and are considered to have tonic, stimulant and emmenagogue properties, with action similar to that of blessed thistle. The aim this study was to investigate the phytochemical constituents of C. cyanu...
In this paper, tuned mass dampers with optimal parameters for long span transmission tower-line system are investigated. Equations of motion for a structure-TMD system are derived, and the parameters of TMD, stiffness and damping are optimized, respectively. According to a real project, three-dimensional finite element models of both transmission tower and transmission tower-line system are cre...
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