Inductive coupling of a global magnetospheric model to a global ionospheric–thermospheric model is described. Existing schemes based on electrostatic coupling are valid for magnetospheric variability occurring on time scales of order 100 s or longer. The formulation developed here extends the validity of the coupling model to time scales of order 10 s, while retaining the physics of quasi-stati...

The photosynthetic microorganism growth description is usually based on the so-called microbial kinetics, i.e. on the lumped parameter models (LPM) describing the photosynthetic response in small cultivation systems with a homogeneous light distribution [3, 6]. However, there is an important phenomenon, the so-called flashing light enhancement, which demands some other model than it residing in...

kinetics of the chemical leaching of chalcocite from a low-grade copper ore in a ferric sulfate medium was investigated using the constrained least square optimization technique. the experiments were carried out for different particle sizes in both the reactor and column at constant eh, ph, and temperature. the leaching rate increased with increase in the temperature. about 50% of the cu recove...

A transmission line model for capacitors is proposed and developed. The model relates electrical parameters to geometrical parameters, leading to simple design rules for power applications. In contrast, design rules based on lumped RLC models are shown to lead to design errors. Experimental results match a simulation based on the distributed model whereas a lumped model gives erroneous predicti...

Numerical modeling and experimentation are used at Xerox Office Group to design, optimize, and verify the fluid dynamic behavior of phase-change ink jets, including the individual jets in a print head. A typical model of an ink jet is based upon lumped-parameter (no spatial variation) assumptions. While quite accurately predicting the main Helmholz resonant frequency (a key performance measure)...

We discuss various issues concerning the behaviors near the boundary (σ = 0, π) and the midpoint (σ = π/2) of the open string coordinate X(σ) and its conjugate momentum P (σ) = −iδ/δX(σ) acting on the matter projectors of vacuum string field theory. Our original interest is in the dynamical change of the boundary conditions of the open string coordinate from the Neumann one in the translational...

We analyse the fi nancial performance of small German hospitals based on balance sheet data of about 1,000 hospitals in 2007. Measures of fi nancial performance are the earnings before interest, tax, depreciation, and amortisation (EBITDA) and the probability of default (PD). We fi nd that, on average, small hospitals have more fi nancial diffi culties than large ones. However, there is conside...

In the talk we will address the problem of finding an optimal dividend policy for a class of jumpdiffusion processes. The jump component is a compound Poisson process with negative jumps, and the drift and diffusion components are assumed to satisfy some regularity and growth restrictions. With each dividend payment there is associated a fixed and a proportional cost. The aim is to maximize exp...