This contribution describes a new method for monitoring productivity in the slaughter pig production unit. The method is implemented as a stand-alone application, based on data from an existing farmmanagement system. With the new method the amount of information increases from quarterly to weekly estimates of daily gain. By calculating average daily gain each time a group of slaughter pigs is d...

Swimming of microorganisms is studied from a viewpoint of extended objects (strings and membranes) swimming in the incompressible uid of low Reynolds number. The agellated motion is analyzed in two dimensional uid, by using the method developed in the ciliated motion with the Joukowski transformation. Discussion is given on the conserved charges and the algebra which are associated with the are...

This paper provides an investigation into the in uence of wake and skew on a ship propeller performance, based on the potential Boundary Element Method (BEM). Two types of in ow wake from a ship (i.e. Seiun-Maru and MS689) have been investigated for two propeller types; a Conventional Propeller (CP) and a Highly Skewed Propeller (HSP). The computed results include pressure distribution, open wa...

We present a family of hedging strategies for a European derivative security in a stochastic volatility environment. The strategies are robust to speciication of the volatility process and do not need a parametric description of it or estimation of the volatility risk premium. They allow the hedger to control the probability of hedging success according to risk aversion. The formula exploits th...

We report the performance of the 183 GHz radiometer system for the CSO-JCMT interferometer during the October 1998 run. The phase correction using the radiometers produced the rms phase uctuations by a factor (a factor of ve less in signal loss due to decorrelation) and achieved a corrected rms path length uctuation of 60 m under a moderately good atmospheric condition (2.2 mm of PWV). We also ...

We exhibit a purely quantum mechanical carrier of the imprints of gravitation by identifying for a relativistic system a property which (i) is independent of its mass and (ii) expresses the Poincare invariance of spacetime in the absence of gravitation. This carrier consists of the phase and amplitude correlations of waves in oppositely accelerating frames. These correlations are expressed as a...

Spatial-temporal modeling of air pollutants, ground-level ozone concentrations in particular, has attracted recent attention because by using spatial-temporal modeling, can analyze, interpolate or predict ozone levels at any location. In this paper we consider daily averages of troposphere ozone over Tehran city. For eliminating the trend of data, a dynamic linear model is used, then some featu...

The evolution of dispersed short-fatigue-cracks is analysed based on the equilibrium of crack-number-density (CND). By separating the mean value and the stochastic ̄uctuation of local CND, the equilibrium equation of overall CND is derived. Comparing with the mean-®eld equilibrium equation, the equilibrium equation of overall CND has di€erent forms in the expression of crack-nucleation-rate or ...

We revisit the dividend payment problem in the dual model of Avanzi et al. ([2–4]). Using the !uctuation theory of spectrally positive Lévy processes, we give a short exposition in which we show the optimality of barrier strategies for all such Lévy processes. Moreover, we characterize the optimal barrier using the functional inverse of a scale function. We also consider the capital injection p...

We study statistical properties of two-dimensional turbulent ows. Three systems are considered: the Navier-Stokes equation, surface quasi-geostrophic ow, and a model equation for thermal convection in the Earth's mantle. Direct numerical simulations are used to determine 1-point uctuation properties. Comparative study shows universality of probability density functions (PDFs) across diierent ty...