Results 71 to 80 of about 1,467,178 (193)

Cold collapse and the core catastrophe

, 1999
We show that a universe dominated by cold dark matter fails to reproduce the rotation curves of dark matter dominated galaxies, one of the key problems that it was designed to resolve.
Aguilar, Avila-Reese, B. Moore, Brainerd, Burkert, Burkert, Carlberg, Cole, Crone, Davis, de Blok, de Blok, Dubinski, Eisenstein, Evans, F. Governato, Flores, Frenk, Fukushige, G. Lake, Gelato, Ghigna, Ghigna, Henriksen, Hoffman, Huss, J. Stadel, Jing, Kravtsov, Kull, Lokas, Moore, Moore, Moore, Navarro, Navarro, Navarro, Nusser, Peebles, Persic, Pickering, Quinn, Quinn, Salvador-Sole, Syer, T. Quinn, Thomas, Tormen, Tremaine, van Albada, Warren, Zwaan   +51 more
core   +1 more source

An asymptotic expansion approach to the inverse radiative transfer problem [PDF]

An iterative technique which recovers density profiles in a nonhomogeneous absorbing atmosphere is derived. The technique is based on the concept of factoring a function of the density profile into the product of a known term and a term which is not ...
Buglia, J. J., Gomberg, R. I.
core   +1 more source

Effect and Compensation of Timing Jitter in Through-Wall Human Indication via Impulse Through-Wall Radar [PDF]

, 2014
Impulse through-wall radar (TWR) is considered as one of preferred choices for through-wall human indication due to its good penetration and high range resolution.
Hu, J., Jin, T., Zhou, Z., Zhu, G.
core   +1 more source

The magnetic field of IRAS 16293-2422 as traced by shock-induced H2O masers

, 2012
Shock-induced H2O masers are important magnetic field tracers at very high density gas. Water masers are found in both high- and low-mass star-forming regions, acting as a powerful tool to compare magnetic field morphologies in both mass regimes. In this
Bisschop, Ceccarelli, Chandler, Claussen, Claussen, Crutcher, Elitzur, F. O. Alves, Fiebig, Fiedler, Furuya, Goldreich, Goodman, Goodman, Imai, J. M. Girart, J. M. Torrelles, Jørgensen, Kaufman, Kuan, Lazarian, Loinard, Looney, Mundy, Nedoluha, Pérez-Sánchez, Rao, Sanna, Sanna, Sarma, Stark, Surcis, Surcis, Tamura, Terebey, Vlemmings, Vlemmings, Vlemmings, Vlemmings, W. H. T. Vlemmings, Walker, Wardle, Wilking, Wootten, Yeh   +44 more
core   +1 more source

Radar High-Resolution Range Profile Rejection Based on Deep Multi-Modal Support Vector Data Description

Remote Sensing
Radar Automatic Target Recognition (RATR) based on high-resolution range profile (HRRP) has received intensive attention in recent years. In practice, RATR usually needs not only to recognize in-library samples but also to reject out-of-library samples ...
Yue Dong, Penghui Wang, Ming Fang, Yifan Guo, Lili Cao, Junkun Yan, Hongwei Liu   +6 more
doaj   +1 more source

Method for compensating bandwidth error of synthetic wideband radar signal

The Journal of Engineering, 2019
The synthetic wideband signal has the advantages of high range and velocity resolution. It has a wide range of applications in target detection and recognition.
Xiaoxin Han, Chao zhou, Quanhua Liu, Yuanyuan Song   +3 more
doaj   +1 more source

Accretion Signatures from Massive Young Stellar Objects

, 2004
High resolution (lambda / Delta-lambda = 50,000) K-band spectra of massive, embedded, young stellar objects are presented. The present sample consists of four massive young stars located in nascent clusters powering Galactic giant H II regions.
A. Damineli, C. L. Barbosa, Kessel O., Kraus M., P. S. Conti, Phillips C. J., R. D. Blum, Richling S., S. Ridgway, Smith L. F.   +9 more
core   +2 more sources

Natural Coronagraphic Observations of the Eclipsing T Tauri System KH 15D: Evidence for Accretion and Bipolar Outflow in a WTTS

, 2003
We present high resolution (R $\sim$ 44,000) UVES spectra of the eclipsing pre-main sequence star KH 15D covering the wavelength range 4780 to 6810 {\AA} obtained at three phases: out of eclipse, near minimum light and during egress. The system evidently
Bailer-Jones, Coryn A. L., Hamilton, Catrina M., Herbst, William, Johns-Krull, Christopher M., Mundt, Reinhard   +4 more
core   +1 more source

Aspects of Radar Imaging Using Frequency-Stepped Chirp Signals

EURASIP Journal on Advances in Signal Processing, 2006
The high-resolution, frequency-stepped chirp signal can be applied to radar systems employing narrow-bandwidth chirp pulses, in order to enhance the range resolution, and to implement SAR/ISAR imaging capabilities.
Jin Ya-Qiu, Zhang Qun
doaj   +1 more source

Inhomogeneous distribution of mercury on the surfaces of rapidly rotating HgMn stars

, 2005
Starspots are usually associated with the action of magnetic fields at the stellar surfaces. However, recently an inhomogeneous chemical distribution of mercury was found for the mercury-manganese (HgMn) star alpha And -- a well-established member of a ...
Kochukhov, O., Kudryavtsev, D., Piskunov, N., Sachkov, M.   +3 more
core   +1 more source