نتایج جستجو برای: radio sensitivity
تعداد نتایج: 432275 فیلتر نتایج به سال:
We present 18-cm radio maps of four Seyfert nuclei, Mrk 1, Mrk 3, Mrk 231 and Mrk 463E, made with the European VLBI Network (EVN). Linear radio structures are present in three out of four sources on scales of ∼100 pc to ∼1 kpc, and the 20-mas beam of the EVN enables us to resolve details within the radio structures on scales of < 10 pc. Mrk 3 was also imaged using MERLIN and the data combined w...
Using a deep Australia Telescope Compact Array (ATCA) radio survey covering an area of ≈3 deg to a 4σ sensitivity of ≥ 100μJy at 1.4 GHz, we study the nature of faint radio galaxies. About 50% of the detected radio sources are identified with an optical counterpart revealed by CCD photometry to mR=22.5mag. Near-infrared (K-band) data are also available for a selected sample of the radio sources...
background and objectives: there are different types of vascular access. we compared the patency rate for six months in ulnar-basilic fistula and radio-cephalic fistula for vascular access in hemodialysis patients. methods: the study was performed on 60 patients of 50.6±13.5 years of age with end-stage renal failure undergoing hemodialysis from 2012-2014 in imam ali hospital in zahedan. patie...
in this paper, a new propagation model based on utd for multiple diffraction paths in cellular mobile radio communications in urban environments is proposed. moreover, the most rigorous novel utd-based expressions for multiple diffractions by buildings and excess path losses are d - rived and analyzed. for this purpose, building rows are supposed to have rectangular cross-sections with the same...
We present a deep image of the optically-powerful quasar E 1821+643 at 18 cm made with the Very Large Array (VLA). This image reveals radio emission, over 280h kpc in extent, elongated way beyond the quasar’s host galaxy. Its radio structure has decreasing surface brightness with increasing distance from the bright core, characteristic of FR I sources (Fanaroff & Riley 1974). Its radio luminosi...
We describe an alkali-metal magnetometer for detection of weak magnetic fields in the radio-frequency (rf) range. High sensitivity is achieved by tuning the Zeeman resonance of alkali atoms to the rf frequency and partially suppressing spin-exchange collisions in the alkali-metal vapor. We demonstrate magnetic field sensitivity of 2 fT/Hz(1/2) at a frequency of 99 kHz with a resonance width of ...
Strong evidence has recently emerged for a variation in the fine structure constant, α ≡ e/h̄c, over the history of the Universe. This was concluded from a detailed study of the relative positions of redshifted optical quasar absorption spectra. However, radio absorption lines at high redshift offer a much higher sensitivity to a cosmological change in α than optical lines. Furthermore, through ...
Background and Objectives: There are different types of vascular access. We compared the patency rate for six months in ulnar-basilic fistula and Radio-Cephalic fistula for vascular access in hemodialysis patients. Methods: The study was performed on 60 patients of 50.6±13.5 years of age with end-stage renal failure undergoing hemodialysis from 2012-2014 in Imam Ali hospital in Zahedan. Pat...
Background Using our method for selectively detecting the response of intratumor quiescent (Q) cells to irradiation, the Q cells was shown to have a much larger hypoxic fraction (HF) than total (= proliferating (P) + Q) tumor cell population irrespective of the p53 status of tumor cells. However, the size of the HF was clearly less than 100%, meaning the Q cell population was never fully hypoxi...
We have conducted a deep survey (r.m.s noise ≃ 17µJy) with the Very Large Array (VLA) at 1.4 GHz, with a resolution of 6 arcsec, of a 1 deg 2 region included in the VIRMOS VLT Deep Survey. In the same field we already have multiband photometry down to IAB = 25, and spectroscopic observations will be obtained during the VIRMOS VLT survey. The homogeneous sensitivity over the whole field has allo...
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