منابع مشابه
Learning Kernels via Margin-and-Radius Ratios
Despite the great success of SVM, it is usually difficult for users to select suitable kernels for SVM classifiers. Kernel learning has been developed to jointly learn both a kernel and an SVM classifier [1]. Most existing kernel learning approaches, e.g., [2, 3, 4], employ the margin based formulation, equivalent to: mink,w,b,ξi 1 2‖w‖ 2 + C ∑ i ξi, s.t. yi〈φ(xi; k), w〉+ b+ ξi ≥ 1, ξi ≥ 0, (1)...
متن کاملThe ratios between the spectral norm, the numerical radius and the spectral radius
Recently, Uhlig [Numer. Algorithms, 52(3):335-353, 2009] proposed open questions about the ratios between the spectral norm, the numerical radius and the spectral radius of a square matrix. In this note, we provide some observations to answer these questions. Keywords—Spectral norm, Numerical radius, Spectral radius, Ratios
متن کاملMaximum mass-radius ratios for charged compact general relativistic objects
– Upper limits for the mass-radius ratio and total charge are derived for stable charged general relativistic matter distributions. For charged compact objects the mass-radius ratio exceeds the value 4/9 corresponding to neutral stars. General restrictions for the red shift and total energy (including the gravitational contribution) are also obtained. It is generally accepted today that black h...
متن کاملHybrid simulations of Z-pinches
Three-dimensional hybrid simulations with kinetic ions and fluid electrons of Z-pinch plasmas are being used to investigate the linear and nonlinear development of sausage and kink instabilities with model profiles in the presence of effects which go beyond ideal magnetohydrodynamics. In addition, the hybrid simulations are also being applied to model start-up plasmas in long pulse Z-pinch impl...
متن کاملMagnetic Field Measurements in Wire-Array Z- Pinches and X Pinches
We are investigating novel techniques to obtain time-dependent magnetic field measurements in wire-array Z-pinches and X-pinches. An ideal method would be emission spectroscopy (Zeeman splitting of lines, for example, in the visible or VUV spectrum), as it would be entirely passive and non-perturbing. However, a spectroscopic method to determine the high magnetic fields present in megampere lev...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Australian Journal of Physics
سال: 1983
ISSN: 0004-9506
DOI: 10.1071/ph830891