Technical University Hamburg-Harburg Research Articles

Oil Emissions of a SI Engine

The aim of the FVV research project “Oil Vaporization” I to III (FVV No. 902) was to measure the oil emissions using thermic and gas-dynamic processes of a combustion engine and subsequent validation of a simulation program. For the first time a cylinder-extraction and rapid emission measurement of the vaporized oil residues in the cylinder of a SI engine was carried out by Helmut Schmidt University (University of the Federal Armed Forces Hamburg), Technical University Hamburg-Harburg and University of Kassel (all Germany). The measurement results obtained made it possible to significantly develop the simulation of the piston ring / cylinder oil emissions in this research project.

Das intelligente Implantat

This article presents an “intelligent” internal fixator system developed by the BG-Unfallkrankenhaus in Hamburg in cooperation with the Technical University Hamburg-Harburg. By application of modern microelectronics to a plate, telemetric load measuring is possible. Due to its small size, the sensor system can be integrated in internal plate systems. The system was initially tested in vitro on plastic bones and then tested in animal studies. After this the first clinical applications on patients were carried out. According to results from animal studies, the system enables fracture healing progression to be monitored and quantified. Initial results in patients with femoral non-unions demonstrate good correlation between bone healing and the progression of the signals received. Routine use of this system would enable telemetrically monitored aftercare of osteosyntheses with optimal utilization of load bearing in the extremities. In addition, fracture healing problems could be identified and dealt with promptly. In our opinion, “intelligent” implants will represent an important tool for osteosynthesis of the future.

Innovative technologies for decentralised water-, wastewater and biowaste management in urban and peri-urban areas

Avoiding the comingling of water flows coming from different sources and thus obtaining flows with a very low dilution factor is the first and major step key to technical solutions for adequate treatment of household wastewaters. Through their decentral structure and effective recovery of water, energy and fertiliser these systems can be highly cost efficient. Fresh water consumption can be reduced by up to 80% while nutrients can be recovered to a large extent. Source control is also advantageous for hygienic reasons: low volumes are far easier to sanitise. Source separation technology in municipal waste water treatment does often lead decentralised or semicentral systems. The first essential step is the separate collection and treatment of toilet waste in households, which contains almost all pathogens and nutrients. New toilet systems with very low dilution factors, ranging from vacuum- through urine sorting to dry toilets, have been introduced in several projects and proven feasible. New ideas such as the black- and greywater cycle systems are presently under research at the Technical University Hamburg Harburg. Such modular, integrated and small scale systems are only possible through recent advances in membrane technology and, due to their small scale, do have the potential to be installed in densely populated regions. These technologies are options for following the principles of ecological sanitation, to contain, to sanitise and to reuse also in urban areas (EcoSanRes, 2003).

Synthesis of the sednet work package 4 outcomes

1 Regione Emilia-Romagna, Responsabile servizio Tutela e Risanamento risorsa acqua, Via Dei Mille, Bologna, Italy 2 Technical University Hamburg-Harburg, Germany 3 Port of Rotterdam, Strategy and Communication Maritime Development, The Netherlands 4 Free and Hanseatic City of Hamburg, Dept. of Port and River Engineering, Germany 5 ICRAM, Italy 6 DEC NV, Belgium 7 ENEA, Italian Agency for new technologies and environment, Italy 8 AKWA Aquatic Sediment Expert Centre Ministry of Transport, Public Works and Water Management, The Netherlands 9 University of Bremen, Germany 10 ALTERRA Dept. of Water and the Environment, The Netherlands 11 Avd.leder, miljo Div. dir. environmental Engineering, Norway 12 ENVIS Srl, Via Fanin 48, 40127 Bologna, Italy 13 TNO, The Netherlands

Re-establishing a capital city

Dr Stimmann, an Engineer and Architect , Assistant Secretary for Planning at the Ministry of Urban Development, Environmental Protection and Technology, Berlin, and also Director of Urban Development at the same Ministry. His professional experience as architect and urban planner includes his involvement in industrial, housing and school construction and he has been Technical Advisorand Director of the Ministry of Building and Housing in Berlin, Urban Planning Department. He has been a member of the academic staff of the Technical University (TU) Berlin, Institute for Urban and Regional Planning; Lecturer at the TU Hamburg-Harburg carrying out research on urban renewal and the preservation of values. He has also done freelance work for the Office for Urban Construction and Urban Research in Berlin and has been Director of Urban Development at the Ministry of Building and Housing, Berlin. He is a member of the Social-Democratic Party (SPD) of Germany. He has published numerous articles in journals and books on urban planning and architecture, and has taken part in several urban planning exhibitions.

Miniaturized flame ionization detector for gas chromatography

The Technical University Hamburg-Harburg and ABB Corporate Research are currently exploring the potential to apply silicon–glass microsystems as technology platform for creating a miniaturized flame ionization detector (FID). This device can be used for the detection of hydrocarbons in gas chromatography. Design and first characterizations of such micro-FIDs have been published elsewhere in Ref. [1] [Sens. Actuators 63B (3) (2000)]. For a deeper understanding of the performance and further optimization potential, the detectors have now been investigated more detailed. The results of those tests show a detection limit of 104ppb pentane and 441ppb methane.

Flow patterns in the square cross-section riser of a circulating fluidised bed and the effect of riser exit design

Solids flow patterns were observed and measured in the square cross-section riser of a laboratory circulating fluidised bed (CFB). Measurements in the 0.14 m square riser used a sampling probe, of internal diameter 3.4 mm, to measure upwards and downwards solids fluxes throughout the cross-section. Interpolation gave complete solids flux profiles over the entire 0.14×0.14 m cross-section. Integration of the solids flux profile gave the external solids circulation rate, in reasonable agreement with measurements external to the riser. Special features of the solids flux profiles are (i) much higher down flux in the corners of the square section and (ii) slightly higher down flux half-way between the corners, near the walls. These features may be due to secondary flow in the square section duct and to enhanced sheltering provided by the two side walls. There is qualitative similarity between these solids flux profiles in the 0.14 m square riser and the profiles measured by Werdermann ((1992, Feststoffbewegung und Warmeubergang in zirkulierenden Wirbelschichten von Kohlekraftwerken. Dr-Ingenieur dissertation, Technical University Hamburg-Harburg) for large industrial combustors. But it is clear that there is a scale-up effect: the film, i.e. the cross-sectional area of duct containing the downflow (adjacent to the walls), is a much smaller proportion of the total area in the large units as compared with the laboratory units. The detail design of the riser exit or outlet bend at the top of the riser has a profound effect upon solids flux profiles in the riser and in particular on the reflux ratio defined as k m =(solids downward flow)/(external circulation rate). Measured values of k m varied by a factor of about 20 according to outlet bend design. These measurements were mostly near the top of the riser, but indications are that k m is affected, throughout the riser, by the design of outlet bend, a phenomenon previously observed in a CFB of circular cross-section by Brereton and Grace ((1994). In A. A. Avidan, Circulating Fluidized Bed Technology IV (pp. 137–144). New York: AIChE).

Influence of the physiological status of bacteria on their transport into permeable sediments

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 190:141-153 (1999) - doi:10.3354/meps190141 Influence of the physiological status of bacteria on their transport into permeable sediments Susanne Heise1,*, Giselher Gust2 1Department of Biological Oceanography, Baltic Sea Research Institute, Seestrasse 15, 18119 Warnemünde, Germany 2Department of Ocean Engineering 1, Technical University Hamburg-Harburg, Lauenbruch Ost 1, 21079 Hamburg, Germany *Present address: Department of Ecological Science and Technology, Technical University Hamburg-Harburg, Eissendorfer Strasse 40, 21073 Hamburg, Germany. E-mail: s.heise@tu-harburg.de ABSTRACT: Starving and grown cultures of the heterotrophic, marine isolate FL2 were exposed to a defined flow at a hydrodynamically smooth, sandy sediment-water interface with a partially homogeneous bottom shear stress pattern but localized high advective inflow. Since transport-determining properties like cell size, hydrophobicity, motility and exopolymer production all change during starvation, we compared the distribution of differently nourished cells and microspheres at the surface and in the sediment after 3 d of exposure. We found different sorting processes between particles and bacteria, and between starving and grown cells, calling into question the transfer of laboratory results from exponentially grown cultures to in situ conditions and generally the substitution of bacteria by particles in transport experiments. While microspheres were distributed according to the advective flow and only weakly retained by interactions with sediment particles, grown bacteria showed a spatially homogeneous distribution over the sediment surface. One suggestion is that active movement renders them independent of advective inflow once they have contact with the sediment. Starved cells, however, accumulated at the surface area of highest advective flow. They excreted exopolymers different from those in exponential phase, and, consequently, formed aggregates of up to 7 µm in diameter, which were then retained at the surface due to straining. If this accumulation turns out to be a widespread behaviour of copiotrophic bacteria, possible consequences--both ecological and also regarding pathogenic bacteria in coastal zones--have to be considered. KEY WORDS: Transport into sediment · Starving bacteria · Microspheres · Exopolymers · Straining Full text in pdf format PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 190. Publication date: December 14, 1999 Print ISSN:0171-8630; Online ISSN:1616-1599 Copyright © 1999 Inter-Research.

Electrically conductive glass fibre reinforced epoxy resin

The research on an industrially manufactured, electrically conductive glass fibre reinforced epoxy prepreg for aviation applications is reported. In a co-operative effort between Technical University Hamburg-Harburg (TUHH) and Daimler-Benz Aerospace Airbus (DASA) a new glass-epoxy composite with both electrical and good mechanical properties was successfully developed. The electrical conductivity was achieved adding carbon black as a conductive filler into the epoxy matrix and this at a very low level of content. The range of possible applications for this new material is not only limited to aviation. It can also be used in other transport systems or in electric and electronic devices.