Measurement of exclusive branching fractions of hadronic one-prong tau decays

We have measured the branching fractions for the hadronic τ decays, τ → π K nπ° ν (0≤ n ≤3), with the L3 detector at LEP. Multiphoton final states are analyzed using the fine-grained, high-resolution electromagnetic calorimeter. The decay channels are identified using a neural network method. The results are: BR (τ → π K ν ) = (11.82 ± 0.26 ± 0.43) %, BR (τ → π K π° ν) = (25.05 ± 0.35 ± 0.50) %, BR (τ → π K 2π° ν) = (8.88 ± 0.37 ± 0.42) %, BR (τ → π K 3πδ ν) = (1.70 ± 0.24 ± 0.38) %, where the first error quoted is statistical, the second systematic

Study of the photon remnant in resolved photoproduction at HERA

Photoproduction at HERA is studied in ep collisions, with the ZEUS detector, for yp centre-of-mass energies ranging from 130-270 GeV. A sample of events with two high-p(T) jets (p(T) > 6 GeV, eta < 1.6) and a third cluster in the approximate direction of the electron beam is isolated using a clustering algorithm. These events are mostly due to resolved photoproduction. The third duster is identified as the photon remnant, Its properties, such as the transverse and longitudinal energy flows around the axis of the cluster, are consistent with those commonly attributed to jets, and in particular with those found for the two jets in these events. The mean value of the photon remnant p(T) with respect to the beam axis is measured to be 2.1 +/- 0.2 GeV, which demonstrates substantial mean transverse momenta for the photon remnant

Ceramic Industry Air Quality. Emissions Into the Atmosphere From Ceramic Tile Processes

The subject of this chapter, air quality associated to the ceramic tile industry, represents a very interesting \u2018real scenario\u2019 in the framework of the whole volume. The reasons can be summarised in this way: (1) the ceramic tile technology includes several significant pollutant emissions into the atmosphere and (2) ceramic industry has generated \u2013 although many years ago and in rather small industrial areas, characterised by large concentrations of factories \u2013 some air quality problems. The Ceramic District of Sassuolo, Italy, can be considered as a significant example of such industrial areas and represents the main reference adopted in this chapter. Another \u2018ceramic district\u2019 is that of Castell\uf3n, Spain, which however is quite different as regards significant factors influencing air quality: factors such as territory, orography, climate, meteorological conditions, urban and industrial settlements and density, road system and traffic, etc. With reference to the Italian ceramic tile industry, this chapter deals with the description and quantification of emissions into the atmosphere from ceramic industries and aims to document the approach adopted, the resources used and the knowledge developed, to drastically reduce the environmental impact of these emissions on air quality. This objective has been successfully achieved, at the point that, in particular, the Italian ceramic tile sector is still working, in the framework of a continuous improvement approach, on its environmental performances, as well as on the exploitation of the results achieved as competitiveness factors

The environmental performances of modern ceramic manufacture and products, used as competitiveness factors - The experience of the European and Italian ceramic tile industry

This chapter deals with the relationships between ceramics and the environment, with particular reference to a specific ceramic sector - floor and wall tile - and to the European ceramic tile industry. In Europe, the Italian ceramic tile industry has a long and significant experience in prevention and reduction of environmental impacts, and can rely on a quantitative knowledge of those impacts, achieved through regular monitoring activities of emissions in force for more than 25 years. Now, however, the whole European ceramic industry, and the ceramic tile sector in particular, is involved in the application of new legislative prescriptions: IPPC Directive (96/61/CE) on Integrated Pollution Prevention and Control, and, in part, ETS Directive (2003/87/CE), establishing a scheme for greenhouse gas emission allowance trading within the European Community. These prescriptions are, in general, more demanding, in terms of environmental performance, compared to the proceeding laws, and may require additional costs, with possible negative effects on competitiveness