Refine
Document Type
- Contribution to a Periodical (45) (remove)
Language
- English (45) (remove)
Has Fulltext
- yes (45) (remove)
Is part of the Bibliography
- yes (45) (remove)
Keywords
- Chromatography (5)
- Laboratory Medicine (5)
- Monitoring/Environmental Analysis (5)
- Pharmacy (5)
- Dünnschichtchromatographie (2)
- E-Learning (2)
- mobile learning (2)
- Active Noise Control (1)
- Air traffic control (1)
- Aktive Schalldämpfung (1)
Institute
- Fakultät Maschinenbau und Verfahrenstechnik (M+V) (26)
- Zentrale Einrichtungen (9)
- Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019) (6)
- Fakultät Medien und Informationswesen (M+I) (bis 21.04.2021) (4)
- CRT - Campus Research & Transfer (2)
- NaSiO - Institut für Nachhaltige Silikatforschung Offenburg (bis 31.12.2022) (1)
Open Access
- Open Access (45)
- Hybrid (18)
- Bronze (2)
After approximately 200 years, a comprehensive access to the texts of Humboldt’s extraordinary exploration of the Americans is within sight. To open the legacy to the public for free access the Humboldt Digital Library (HDL) project has been developing a dynamic amount of data related to studies of Alexander von Humboldt. The library includes a range of texts, tables and images, as well as many tools that assist mining the data and navigating the system.
Auxiliary power units (APUs) are used in mobile applications to supply electrical power in the range of 3 to 10 kW. The state of the art generators are driven by a diesel engine at constant speed. They have a low efficiency (high fuel consumption) as they operate mostly in partial load conditions. A higher efficiency for partial loads is feasible by adjusting the speed of the diesel engine to its optimum efficiency. A frequency converter provides a constant electric frequency at variable speed of the generator. The resulting higher investments for such a variable speed generator (VSG) need a proof of economics, which is demonstrated by this investigation.
Under a grant of the German ProInno program („Erhöhung der Innovationskompetenz mittelständischer Unternehmen“)the Hochschule Offenburg participated during the past 2 years in an industry project prototyping a new type of service for modern Air Traffic Control (ATC) applications.<br> Objective of the project has been the joint development of hardware and software components for a so-called TIS-B (Traffic Information System - Broadcast) support infrastructure to enable new cockpit applications increasing the air situation awareness for pilots of commercial airliners [1]. At the core of the project is a space-time-scheduler, controlling a battery of TIS-B groundstations over a Wide Area Surveillance Network [4].<br> The project has been successfully concluded and is currently in its evaluation phase. Industry partner was the Karlsruhe-located company COMSOFT, international market leader in ATC sensor networks.
Rudolf E. Kaiser
(2020)
We present a video-densitometric quantification method for the pain killer known as diclofenac and ibuprofen. These non-steroidal anti-inflammatory drugs were separated on cyanopropyl bonded plates using CH2Cl2, methanol, cyclohexane (95+5+40, v/v) as mobile phase. The quantification is based on a bio-effective-linked analysis using vibrio fischeri bacteria. Within 10 minutes a CCD-camera registers the white light of the light-emitting bacteria. Diclofenac and ibuprofen effectively suppress the bacterial light emission which can be used for quantification within a linear range of 10 to 2000 ng. The detection limit for ibuprofen is 20 ng and the limit of quantification 26 ng per zone. Measurements were carried out using a 16-bit ST-1603ME CCD camera with 1.56 megapixels [from Santa Barbara Instrument Group, Inc., Santa Barbara, USA]. The range of linearity covers more than two magnitudes because the extended Kubelka-Munk expression is used for data transformation [1]. The separation method is inexpensive, fast and reliable. Ibuprofen is named after its chemical description: iso-butyl-propanoic phenolic acid. Both pain killers are world-widein use and both substances are stable in aqueous solution. Both substances are mainly excreted in the urine.
Home Automation, Smart Metering, reduction of energy consumption for climate preservation – those buzz words are flooding the daily press.The European Directive 2006/32/EC (Energy-Use Efficiency and Energy Services) commits its members to reduce their energy consumption about nine percent from 1996 to 2015, and supports smart metering and the need of new developments for encouraging energy efficiency and CO² reduction in households and commercial buildings. The European countries have started different projects to achieve this goal. Also outside Europe, smart metering gains interest, for energy savings and better distribution network control.
This study focuses on the experimental and numerical investigations on a commercial Ranque-Hilsch vortex tube. Ranque-Hilsch vortex tubes have many applications in industry and production as they can generate a very cold flow just from pressurized air .e.g. machine tool cooling. Main objective of this study is the energy separation in the flow field which results in a temperature drop on the cold exit of the tube. This was investigated experimentally by measuring the outlet temperature on the cold exit and the pressure drop on the flow restrictor valve on the hot exit. At a pressure drop of 0.5 bar the vortex tube showed the best performance by reaching a cold exit temperature of –16.7 °C. The Inlet flow was pressurised air at 20 °C and 6 bar.<br /> The numerical analysis was carried out by full 3D steady state CFD-simulation using the commercial software ANSYS CFX 11.0. The three dimensional model represented a 120° sector of the tube using periodic boundary conditions. A comparison between different turbulence models (k – å, RNG k – å, k – ù, SST) was carried out. The classic k – å two layer turbulence model showed the best results compared to the experiment. The energy separation and the drop in cold exit temperature are highest when the viscous work term is included into the energy equation. These effects of including the viscous work term into the energy separation have also been investigated.
Cardiac resynchronisation therapy (CRT) is a promising treatment option in patients with chronic heart failure. In this article the roles of semi-invasive esophageal left-heart electrocardiography and functional cardiac nuclear imaging in the field of CRT are highlighted, as the combination of both could be a favourable diagnostic approach in special cardiac situations. Also original esophageal left heart electrogram data of exemplary CRT patients is presented.
Radio frequency (RF) power amplifiers (PA) are the most power consuming components of a mobile communications unit. They are used to convert the DC power from the battery into RF power delivered to the antenna. In a cell phone it becomes very important to use highly efficient power amplifiers, such as Class C and Class E PAs, to increase the talk time which is directly proportional to the battery life. On the other hand, these RF PAs are inherently nonlinear and produce spectral regrowth and other undesirable effects.