Vasiloiu M.,Vienna University of Technology |
Rainer D.,Vienna University of Technology |
Gaertner P.,Vienna University of Technology |
Reichel C.,Seibersdorf Labor GmbH |
And 2 more authors.
Catalysis Today | Year: 2013
We present design, synthesis and application of basic chiral ionic liquids based on commercially available (S)-proline. This new set of chiral ionic liquids was specifically designed to replace trifluoroacetic acid in enamine-based organocatalysis for asymmetric CC bond formation. Based on their permanent charge, these chiral ionic liquids could be applied as organocatalysts in asymmetric aldol reaction of 4-nitrobenzaldehyde and acetone, and good yields and selectivities up to 80%ee could be obtained without additional acid. © 2012 Elsevier B.V. Source
Schulmeister K.,Seibersdorf Labor GmbH
Medical Laser Application | Year: 2010
In order to perform a quantitative laser safety analysis, it is necessary to compare the exposure limit (EL) for the eye or the skin with the expected exposure level in terms of irradiance or radiant exposure. The exposure level, however, is not necessarily the actual physical irradiance or radiant exposure, but is a value that is averaged over an aperture with a defined diameter. When the laser beam is smaller than the averaging aperture, the resulting "biologically effective" irradiance or radiant exposure value is much smaller than the actual value. The background of the averaging aperture sizes that are specified is discussed together with the ELs for laser radiation. For the wavelength range where the retina is at risk (400-1400 nm) the diameter of the averaging aperture is 7 mm. This aperture is be used to average the irradiance that is incident at the level of the cornea. Since the EL in this wavelength range is also given as irradiance and referenced to the position of the cornea, the concept of averaging apertures is cohesive; however, it is not intuitive and it is difficult to convey in training courses, and is often the reason for miscalculation. An alternative, more straightforward dosimetry concept is proposed, where the EL is transformed into a "power" value by multiplication by the area of the averaging aperture. This procedure results in values which are identical with the accessible emission limits for Class 1 of IEC 60825-1. For the safety analysis, this EL (for instance 1 mW) is compared to the power that passes through an aperture with a diameter of 7 mm. This alternative concept is mathematically equivalent to the currently defined concept. However, in contrast to the present dosimetry concept, it is intuitive because the exposure value that is compared to the EL can be understood as "power that passes through the pupil of the eye". © 2010. Source
Seibersdorf Labor Gmbh | Date: 2014-03-07
A can includes a body, a sealing area on a wall delimited by a breaking edge, an opening element which in an initial position abuts the wall and is connected to the wall by a connecting element of the opening element. Pivoting the opening element into an open position tears the sealing area along the breaking edge and forms an emptying opening in a region delimited by the breaking edge. The opening element has a carrier body of electrically and/or magnetically insulating material, the opening element carries an antenna on or in the carrier body and a transponder chip connected to the antenna. An electric connection line electrically conductively interconnects and short-circuits terminals of the antenna in the initial position. The electric connection line is irreversibly interrupted and activates the antenna when opening the can by pivoting the opening element from the initial to the open position.
AIT Austrian Institute of Technology and Seibersdorf Labor Gmbh | Date: 2013-03-08
A device determines a capacitance between two electrodes. The device contains a measurement circuit disposed downstream of the electrodes to determine the capacitance between the two electrodes, a communication unit disposed downstream of the measurement circuit, and a first antenna, connected to the communication unit, and having a coil configuration and a winding. The communication unit is configured to transmit its readings to an external data communication unit. The device further contains a second antenna having a coil configuration and a winding connected to the measurement circuit. The connections of the second antenna are connected to the electrodes, such that, when the antenna is excited with an electromagnetic alternating field, there is an alternating current on the electrodes. The measurement circuit performs a measurement of the alternating current on or flowing through the electrodes and the output of the measurement circuit is supplied to the communication unit.
Seibersdorf Labor Gmbh and AIT Austrian Institute of Technology | Date: 2013-09-17
A dispensing device for dispensing liquids, particularly liquid medications to people, contains a container which is filled with a liquid and which has an opening at one end for dispensing same. The dispensing device further has at least one pair of capacitive measuring electrodes which are arranged in an outer region of the container, particularly on the wall, opposite one another, for determining the permittivity of the respective medium in the intermediate region between the measuring electrodes. A shield is arranged around the container and surrounds the measurement electrodes in a sheath-like manner.