Heavy singlet neutrinos admit Majorana masses which are not possible for the Standard Model particles. This suggest new possibilities for generating the masses and mixing angles of light neutrinos. We present a model of neutrino physics which combines the source of lepton number violation with the flavor symmetry responsible for the hierarchy in the charged lepton and quark sector. This is acco...

Economical profit represents one of core motivation factors of research and development activities in the field of intelligent transportation systems (ITS). Certainly, it is not the only one. Increasing mobility, safety, traffic flow fluidity and environment protection are other very strong motivations for implementation of ITS in practice. The paper analyzes the possibilities of exploitation o...

The world of justice is undergoing drastic changes that commenced about a decade ago. Trends in an effort for enterprise like management, along with the advent of information and communication technologies, have culminated in a strong imperative for technological and organizational reforms. However, justice is not simply another sector for e-government implementations. Justice is an autonomous ...

Welding hot-work tool steels, containing 0.3-0.6% of carbon, is difficult both because of the elevated carbon content and because of significant hardening resulted from large amounts of alloying elements. A development of welding technology, i.e. better quality of electrodes, modern welding devices, improved welding technologies and better steel quality, make welding of such steel types possibl...

BACKGROUND The objective direct and indirect costs of sleep-disordered breathing (snoring, sleep apnoea (SA) and obesity hypoventilation syndrome (OHS)) and the treatment are incompletely described. METHODS Using data from the Danish National Patient Registry (1998-2006), 12,045, 19,438 and 755 patients were identified with a diagnosis of snoring, SA and OHS, respectively. For every patient, ...

Spectrophotometric measurement applied on saturated granular activated carbon (GAC) is not yet explored. A colorimetric method in the visible range has been developed in order to determine the exhaustion level of GAC used in rum production. Aqueous ammonia solution has been used as an indicative agent to determine the extraction rate of taste compounds within the rum production process and the ...

Direct composites in posterior teeth are a part of the standard therapy spectrum in modern dentistry. The excellent performance of this form of restoration in the masticatory load-bearing posterior region has now been demonstrated in numerous clinical studies. The procedure is usually carried out in an elaborate layering technique. Aside from the possibilities that highly aesthetic composites o...

Given the choice between rehabilitation of a cultural heritage site and new build, recent history in Norway shows that build is often chosen, with justification cost efficiency.
 This paper compares approaches to sites from property development protection point view test this judgment. These two professional fields overlap need cooperate. Thus, closer look at their similarities differences...

Open Source Software has received lately a great deal of attention, specially due to its lower cost in comparison to Proprietary Software. In the education area, this is quite important due to economical restrictions. Lately, we have seen different Spanish communities embracing the OSS model following different models. This article begins by examining OSS history, as well as its main strengths ...

Flotation tailings from copper production are deposits of copper and other valuable metals, such as Mo, V and U. New hydrometallurgical technologies are more economical and open up new possibilities for metal recovery. This work presents results of the study on the extraction of copper by mixed extractant consisting p-toluidine dissolved in toluene. The possibility of simultaneous liquid-liquid...