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nr 06
16-21
EN
On 20 February 2010 the Regulation (EC) No 66/2010 of the European Parliament and of the Council of 25 November 2009 on the EU Ecolabel has come into force which replaced hitherto Regulation no. 1980/2000. The Regulation lays down, among the others, rules for the establishment and application of the voluntary EU Ecolabel scheme, defines general requirements for EU Ecolabel criteria, market surveillance and control of the use of the EU Ecolabel, the role of Competent bodies and European Union Ecolabelling Board. The EU Ecolabel scheme is part of the sustainable consumption and production policy of the Comminity, which aims at reducing the negative impact of consumption and production on the environment, health, climate and natural resources. The scheme is intended to promote those products which have a high level of environmental performance throught the use of the EU Ecolabel.
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tom 37
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nr 05
48-51
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tom nr 7
433-438
PL
Omówiono wybrane zagadnienia zasilania w energię elektryczną podziemnych zakładów górniczych na przykładzie transformatorów grupy II, eksploatowanych w stacjach transformatorowo-rozdzielczych, stanowiących część składową wewnętrznych instalacji i sieci rozdzielczych wysokiego i średniego napięcia, zasilających obiekty, maszyny i urządzenia. Podano wnioski wynikające z ich wieloletniej eksploatacji.
EN
Discussed are selected problems with electric power supply to underground mining plants on the example of Group II transformers. They work in transformer distribution substations, being a part of internal installations and networks of high and medium voltage, and supply objects, machines and equipment with electric energy. Given are conclusions arising from many years of operation.
EN
There exists a need in a quality and accuracy of a three-dimensional laser metrology operating in numerically controlled automatic machines. For this purpose, one sends three laser beams mutually perpendicular. These three beams of the wavelength λ = 0.6328 μm are generated by the same laser and are directed along three independent, orthogonal, mutually perpendicular, optical paths with a given light polarization plain. Using these beams, constituting the frame of coordinates, three independent laser rangefinders are able to determine spatial coordinates of a working tool or a work piece. To form these optical pulses, a special refractive index matched Half-Wave Plate with nematic Liquid Crystal (LCHWP) was applied. The presented half-wave plate is based on a single Twisted Nematic (TN) cell (with the twist angle φ = π/2) of a rather high cell gap d ~15 μm filled with a newly developed High-Birefringence Nematic Liquid Crystal Mixture (HBLCM) of optical anisotropy as high as ∆n ~0.40 at λ = 0.6328 μm, where the Mauguin limit above 5.00 ~ ∆nd >> λ/2 = 0.32 is fulfilled.
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