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347 results on '"Nielsen, Bjarne"'

106. Energi og luftfugtighed

Author

Andersson, Niels Erik, Nielsen, Otto Frøsig, Jacobsen, Lis, and Nielsen, Bjarne

Published
2000

120. Simple Procedures for the Preparation of 1,3,5-Substituted 2,4,6-Trimethoxy-benzenes.

Author

Nielsen, Bjarne E., Gotfredsen, Henrik, Rasmussen, Brian, Tortzen, Christian G., and Pittelkow, Michael

Subjects
*SINGLE crystals, *X-rays, *AMIDES, *BENZENE, *CHEMICAL synthesis, *UREA
Abstract

We describe straightforward protocols for the preparation of a number of 1,3,5-substituted 2,4,6-trimethoxybenzenes. A two-step procedure for the preparation of a 1,3,5-tris-methylamino- 2,4,6-trimethoxybenzene and further synthetic elaboration of this key substrate to yield a triamide, a tricarbamate and three different triureas is described. We also present a computational (DFT) study that investigates the different possible conformations of the overcrowded benzene substrate and a single-crystal X-ray structure of one of the key intermediates. [ABSTRACT FROM AUTHOR]

Published
2013
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136. Conduction Cooled High Temperature Superconducting Dipole Magnet for Accelerator Applications.

Author

Zangenberg, Nikolaj, Nielsen, Gunver, Hauge, Nils, Nielsen, Bjarne Roger, Baurichter, Arnd, Pedersen, Christian G., Brauner, Lars, Ulsoe, Bo, and Moller, Søren Pape

Subjects
HIGH temperature superconductors, SUPERCONDUCTING magnets, MAGNETIC dipoles, COPPER, COILS (Magnetism)
Abstract

A 3T proof-of-principle dipole magnet for accelerator applications, based on 2nd generation high temperature superconducting tape was designed, built, and tested by a consortium under the lead of Danfysik. The magnet was designed to have a straight, circular bore with a good field region of radius r=25\ mm, and a magnetic length of 250 mm. A total length of 2.5 km YBCO-based copper stabilized conductor supplied by SuperPower Inc., NY, USA, was isolated with 0.025 mm of epoxy and subsequently wound into 14 saddle coils and 4 racetrack coils with a cosine theta like configuration. The coils were impregnated with epoxy and mounted between a support of stainless steel and a collar made from aluminum. The cold mass consisting of the coil assembly and a laminated steel yoke is cooled by two cryocoolers from via copper bars to below 20 K. Current leads were made from the same batch of HTS tape. [ABSTRACT FROM PUBLISHER]

Published
2012
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142. Propagation temperature, PPFD, auxin treatment, cutting size and cutting position affect root formation, axillary bud growth and shoot development in miniature rose (Rosa hybrida L.) plants and alter homogeneity.

Author

Bredmose, Niels, Kristiansen, Kell, and Nielsen, Bjarne

Subjects
ROSES, PLANT physiology, PLANT development, PLANT growth, ROOTING of plant cuttings, HOMOGENEITY
Abstract

Rooting and growth responses of miniature rose cuttings were investigated in an experiment in which four propagation temperatures, two photosynthetic photon flux densities (PPFDs) with five auxin (IBA) concentrations, cutting sizes and cutting positions, were combined factorially in a response-surface design. Most prominently, temperature, cutting size and auxin and their interactions, influenced root and shoot growth. A propagation temperature of 24.6°C, and IBA concentrations between 10-3 and 10-1M, depending on temperature, were optimal for root formation. Root formation in extra short cuttings was delayed at low IBA concentrations. Regarding root formation, IBA could substitute for increased temperature as well as for increased cutting size. Onset of axillary bud growth was fastest at 24.6°C, and delayed in extra short cuttings. Application of IBA at 10-4 to 10-3M was optimal for axillary bud growth. By increasing the IBA concentration both time to flowering and plant height increased at 24.6°C. In cuttings from higher positions on stock plants, axillary shoots enhanced their growth to flowering, became shorter, and weighed less, suggesting occurrence of positional effects (topophysis). The growth rate increased with increasing IBA concentration, as well as from medial to low positioned cuttings. Increasing propagation PPFD from 46 to 72 µmol m-2s-1 did not affect the parameters. Time to axillary bud growth and time to first flower were related to time-to-visible root. Fast formation of roots apparently resulted in fast axillary bud growth. In time-to-visible root and axillary bud growth, the smallest variation between plants was found at optimal ranges for temperature, IBA concentration and cutting size, and further factors optimal for root formation and axillary bud growth provided the most synchronized plant development. [ABSTRACT FROM AUTHOR]

Published
2004
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146. NorSIKT–Nordic System for Intelligent Classification of Traffic

Author

Vaa, Torgeir, Melén, Per, Andersson, Dennis, and Nielsen, Bjarne Bach

Abstract

The NorSIKT project is carried out in cooperation between all Nordic countries (Sweden, Denmark, Island, Finland and Norway) and is financed by the NordFOU Research Cooperation (ministered by the Director Generals in each country). The main objective of the NorSIKT project is to standardize the system for classification of motor vehicles in the Nordic countries in order.In the first phase of the project a detailed survey of the traffic data system in the Nordic countries was carried out. The state-of-the-art report presents the situation in terms of current definitions for the classification of vehicles and describes the traffic counting systems in each country. The state-of-the-art report has furthermore been used as a basis for developing a preliminary vehicle classification system introducing some new principles where vehicles can be classified from different types of properties like length, weight, number of axels, type of fuel, etc. Each country can adopt the classification properties that best meet the needs in the country. In the second and ongoing phase different type of registration equipment on the Nordic market will be tested to investigate how different type of equipment meets different classification principles.

Published
2012
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