After providing an extension of the Slepian–Bangs formula for general noncircular complex Gaussian distributions, this paper focuses on the stochastic Cramér–Rao bound (CRB) on direction-of-arrival (DOA) estimation accuracy for noncircular sources. We derive an explicit expression of the CRB for DOA parameters alone in the case of noncircular complex Gaussian sources by two different methods. O...

Abstract The noncircular synchronous belt drive mechanism has demonstrated certain achievements and been used in special fields. Research regarding mechanisms focused on optimization design kinematic analysis China, whereas two pulley transmissions have developed overseas. However, owing to the characteristics of pulley, real-time variation length slack during transmission is significant, resul...

Investigation of the symmetry of the majorand minor-axis rotation curves reveals strong evidence of nonconcentric gas orbits with the maximum center shift of D300 pc. Comparisons between kinematic and photometric structure (e.g., position angles, inclinations, centers) show considerable noise on small scales. Although large-scale averages are in agreement, this noise is a matter of some concern...

We present MUSE integral field stellar and ionized velocity maps for a sample of 14 barred galaxies. Most these objects exhibit "S"-shape iso-velocities in the bar region indicative presence streaming motions fields. % By applying circular rotation models we observe that bars leave symmetric structures residual velocity. %which demonstrates capabilities instrument detecting kinematic signatures...

Gas foil bearing has been widely used in high-speed turbo machinery due to its oil-free, wide temperature range, low cost, high adaptability, stability and environmental friendliness. In this paper, state-of-the-art investigations of gas bearings are reviewed, mainly on the development China. After decades development, progress achieved field Small-scale applications have realized a variety mac...

BACKGROUND AND PURPOSE This study sought to determine the frequency of noncircular lumens in patients with significant carotid atherosclerotic disease and to evaluate the effect of noncircular lumens on stenosis measurement derived from angiographic projections. METHODS One hundred consecutive patients presenting with an internal carotid artery stenosis of at least 50% were imaged with spiral...

We report high-resolution CO(1–0) observations in the central 6 kpc (1) of the LINER galaxy NGC5005 with the Owens Valley Radio Observatory millimeter array. Molecular gas is distributed in three components — a ring at a radius of about 3 kpc, a strong central condensation, and a stream to the northwest of the nucleus but inside the 3 kpc ring. The ring shows systematic noncircular motions, wit...

These two studies explored 3- and 5-year-olds' evaluation of noncircular and circular explanations, and their use of such explanations to determine informant credibility. Although 5-year-olds demonstrated a selective preference for noncircular over circular explanations (Experiment 1: Long Explanations; Experiment 2: Short Explanations), 3-year-olds only demonstrated a preference for the noncir...