• According to a survey carried out by IDC Enterprise Panel, Cloud users regarded security as the top challenge with 75% of surveyed users worried about their critical business and IT systems being vulnerable to attack • Insider attacks remain one of the biggest threats in the Cloud today. • Data owners are increasingly demanding greater control over their data as they no longer know how and wh...

The amount of data hosted by Internet servers and data centers is increasing at a remarkable pace requiring more capable and more e cient servers. However, physical e ciency does not necessarily correlate with computational e ciency. In fact, independent studies reveal that Internet servers are mostly over provisioned even though additional servers are deployed each year. Understanding the char...

Demand-response management is an approach that includes the power demand side into the power management process to reshape power demand of consumers to the current availability of power. Data centres are major energy consumers that are highly interesting for demandresponse management. However, in contrast to many other energy consumers, data centres have a highly dynamic flexibility in terms of...

We consider threshold production of arbitrary number of Higgs particles ρ by fermion-antifermion pair f f̄ . The nullification of amplitudes for the special case mρ = 2mf is explained in terms of hidden symmetry of the reduced effective dynamics. supported by the Lódź University grant No.269. supported by KBN grant No. 5 P03B 06021

In this paper we consider radial DEA models without inputs (or without outputs), and radial DEA models with a single constant input (or with a single constant output). We demonstrate that (i) a CCR model without inputs (or without outputs) is meaningless; (ii) a CCR model with a single constant input (or with a single constant output) coincides with the corresponding BCC model; (iii) a BCC mode...