The hollow plasma channel is analyzed as an accelerating structure. The excitation of the channel by an ultra-relativistic beam is analyzed. Coupling to the fundamental and all higher order azimuthal modes of the excited electromagnetic elds is derived. Implications of this work for plasma-based accelerators, including beam loading and beam breakup, are discussed. Small initial transverse displ...

In this paper we propose a novel qualitative formalism to model gene expression dynamics dependent on dilution due to growth rate of the cell. We extend the piecewise linear (PL) systems by keeping the use of step functions to model the interactions between the elements and adding a growth rate expression to model the dilution effect. Focusing on the global gene expression machinery in bacteria...

Reliable dynamic descriptions of cellular growth are important for many practical applications including bioreactor design and control. A chemically structured growth model of Escherichia coli has been formulated and herein we focus on finding the essential dynamic order of the metabolic part of this model. Standard linear analysis is applied and the main finding is that the model contains thre...

We consider a model of galaxy clusters in which the hot gas is in hydrostatic equilibrium and maintains energy balance between radiative cooling and heating by thermal conduction. We analyze the thermal stability of the gas using a Lagrangian perturbation analysis. For thermal conductivity at the level of ∼ 20 − 40% of Spitzer conductivity, consistent with previous estimates for cluster gas, we...

We investigate the linear growth and vertical structure of the magnetorotational instability (MRI) in weakly ionised, stratified accretion discs. The magnetic field is initially vertical and dust grains are assumed to have settled towards the midplane, so charges are carried by electrons and ions only. Solutions are obtained at representative radial locations from the central protostar for diff...

fast fracture is one of the major failure modes in brittle polymers. generally, crack growth in these polymers may occur under combined tensile-shear loading. however, the fracture test data reported previously for some dental restorative resins can not be predicted by using the available fracture criteria.in this paper, a modified fracture criterion is used for estimating the fracture load for...

The nursing shortage is exacerbated by the faculty shortage, as faculty approach retirement age and too few faculty exist to replace them. Masters-prepared nurse with limited preparation for teaching may be unable to attend traditional educational programs because of work and family commitments. Without further academic preparation, these nurses are illprepared for the faculty role. The College...

In recent years online and blended communities have become a popular topic among educationalists. In this paper we present a framework that supports the analysis, development and maintenance of online and blended communities. This is applied to two community case studies that differ along several key dimensions such as type of membership, the purpose of the communities, their policies and size....

In This paper, we focus on the need for compares the organic production, operation and management patterns between paddy rice production base of Zhongliangmeiyu Ltd (Meiyu for short) and organic vegetable production base of company A, and adopt the SWOT approach to analyze the strengths, weaknesses as well as external opportunities and threats of the two patterns. The conclusion can be briefed ...