The CDF dijet excess from intrinsic quarks

The CDF collaboration reported an excess in the production of two jets in association with a $W$. We discuss constraints on possible new particle state interpretations of this excess. The fact of no statistically significant deviation from the SM expectation for {$Z$+dijet} events in CDF data disfavors the new particle explanation. We show that the nucleon intrinsic strange quarks provide an important contribution to the $W$ boson production in association with a single top quark production. Such {$W$+t} single top quark production can contribute to the CDF {$W$+dijet} excess, thus the nucleon intrinsic quarks can provide a possible explanation to the CDF excess in {$W$+dijet} but not in {$Z$+dijet} events.Comment: 4 latex pages, 1 figure. Version for journal publicatio

New concept of power based pole slip protection for dispersed generators in smart grid environment

The paper presents a new pole slipping protection method that combines high efficiency of pole slip detection and sensitivity to many sources of potential pole slipping. To simplify the setup process the adaptive settings are calculated continuously. The new adaptive method utilizes active and reactive power measurements on machine terminals to ascertain that the synchronous machine is committed to pole slips. In doing so, it offers the capability of detecting pole slips even before it occurs (predictive features). During the method investigation the main efforts have been focused on the development of new protection techniques, which should ensure better (faster and more selective than currently known) detection of loss of synchronism in a synchronous machine. In the article a new approach to pole slipping protection and exemplary results are presented. The method has been successfully tested with utilization of data from simulation as well as signals from the laboratory of real synchronous machines