Fak. 3 Prozesswissenschaften

1215 Items

Recent Submissions
Towards By-Product Utilisation of Pea Hulls: Isolation and Quantification of Galacturonic Acid

Gutöhrlein, Friederike ; Drusch, Stephan ; Schalow, Sebastian (2018-12-10)

In order to evaluate by-products from food processing as alternative raw materials for pectin extraction, their amount of galacturonic acid (GalA) has to be analysed as a marker for pectin content. In the present study, significant differences in GalA release using different digestion methods are shown for pea hulls, as an example of by-products with a high content of cellulose. Complete digest...

Model for tooth development in vitro

Rosowski, Jennifer (2019)

The ultimate goal of Tissue Engineering is the regeneration of whole organs or functional organ units. Recent approaches rely on the usage of adult tissue-specific cells in three-dimensional culture. It is now accepted that "Developmental Engineering", the recapitulation of critical initial steps of organogenesis in vitro, is more expedient. Identification of key players and basic mechanisms be...

Dispersion and phase separation in liquid multiphase systems

Hohl, Lena Katharina (2019)

Microemulsion systems consisting of water, 1-dodecene and different non-ionic surfactants can develop up to three liquid phases as a function of composition and process conditions. These innovative solvent systems are promising reaction media for processes such as the hydroformylation of long-chained olefins. In this work, the influence of the third phase on the drop size distributions and the ...

Entwicklung von Fehlererkennungs-, Zustandsschätzungs-, Regelungs- und ganzzahligen Optimalsteuerungsmethoden für pulsierende, detonative Brennkammern anhand eines akustischen Ersatzsystems

Wolff, Sascha Dominik (2019)

Aktuelle Forschungsbestrebungen zur Effizienzsteigerung von Gasturbinen verfolgen häufig den Ansatz eines Wechsels des zugrundeliegenden Kreisprozesses weg vom Brayton- hin zum Humphrey-Kreisprozess. Eine vielversprechende Möglichkeit, diesen Kreisprozess technischzu realisieren, ist durch den Einsatz einer pulsierenden, druckerhöhenden Detonationsbrennkammer gegeben. Eine solche Brennkammer be...

The redox behavior of dimethyl sulfide and dimethyl sulfoxide in malting and brewing

Baldus, Matthias (2019)

Dimethyl sulfide (DMS) is a small thioether that can be found in miscellaneous foodstuffs. In beer it can evoke distinctive off-flavors, which are often ascribed as “cooked-vegetable”-like. Dimethyl sulfoxide (DMSO) reduction by yeast is a potential source for DMS in beer. However, the contribution of DMSO to the final levels of DMS in beer is not entirely resolved. The aim of this dissertation...

Creep behavior of a γ′-strengthened Co-base alloy with zero γ/γ′-lattice misfit at 800 °C, 196 MPa

Midtlyng, Jan ; Epishin, Alexander I. ; Petrushin, Nikolay V. ; Link, Thomas ; Nolze, Gert ; Svetlov, Igor L. ; Reimers, Walter (2017)

Deformation and structural behavior of an experimental γ′-strengthened Co-base alloy during creep at 800 °C and 196 MPa have been investigated. The characteristic features of this alloy are zero γ/γ′-lattice misfit and a fine γ/γ′-microstructure. In the initial condition, the γ′-precipitates in this alloy are small (size of about 100 nm), have polyhedral morphology, and are separated by the ver...

Direct contact membrane distillation of saline wastewater for recycling

Abdelkader, Sana (2018)

Freshwater availability is suffering from an increasing pressure created by the growing demand, depleting resources and the environmental pollution. Saline wastewater and saline industrial effluents are creating a complex issue due to their contribution in the pollution and the alteration of both surface water and groundwater properties. Thus, attention is drawn to investigating complete treatm...

Verfahrenstechnische Weiterentwicklung des Fused Layer Manufacturing zur Reduzierung der Anisotropie im Bauteil

Butzke, Jens (2019)

Generative Fertigungsverfahren sind im industriellen Umfeld seit mehr als 30 Jahren ein weitverbreitetes Werkzeug zur Herstellung von Prototypen. Das Fused Layer Manufacturing (FLM) generiert im 2½-dimensionalen Strangablageverfahren Anschauungsmuster aus thermoplastischen Filamenten. Dass dieses Verfahren sich nur sehr eingeschränkt für die Herstellung von Funktionsmustern eignet, liegt in der...

Exergy-based analysis of aircraft environmental control systems and its integration into model-based design

Bender, Daniel (2019)

Aircraft environmental control systems are complex energy intensive systems and the most important non-propellant consumer of energy among all aircraft systems. The intense pressure on airlines to remain competitive on the global market demands more efficient aircraft greater than ever. Meaningful analysis methods for the evaluation of architectural designs and effective modeling and simulation...

A framework for the derivation of dynamic process models for sieving

Elskamp, Frederik (2018)

For a wide field of applications in mechanical process engineering and materials preparation technology, screening as technical simple but still not satisfactorily understood process step is well suited to separate bulk materials according to their particle sizes. Frequently, particles prevail in broad size distributions, highly non-spherical shape and under moist conditions, complicating the h...

Resource Efficiency Assessment—Comparing a Plug-In Hybrid with a Conventional Combustion Engine

Henßler, Martin ; Bach, Vanessa ; Berger, Markus ; Finkbeiner, Matthias ; Ruhland, Klaus (2016)

The strong economic growth in recent years has led to an intensive use of natural resources, which causes environmental stress as well as restrictions on the availability of resources. Therefore, a more efficient use of resources is necessary as an important contribution to sustainable development. The ESSENZ method presented in this article comprehensively assesses a product’s resource efficie...

Assessing the Availability of Terrestrial Biotic Materials in Product Systems (BIRD)

Bach, Vanessa ; Berger, Markus ; Finogenova, Natalia ; Finkbeiner, Matthias (2017)

Availability of abiotic resources has been a topic of concern in recent years, resulting in several approaches being published to determine their availability on country and product level. However, the availability of biotic materials has not been analyzed to this extent yet. Therefore, an approach to determine possible limitations to availability of terrestrial biotic materials over the entire...

Detection of Listeria innocua on roll-to-roll produced SERS substrates with gold nanoparticles

Uusitalo, S. ; Kögler, Martin ; Välimaa, A.-L. ; Popov, A. ; Ryabchikov, Yu ; Kontturi, V. ; Siitonen, S. ; Petäjä, J. ; Virtanen, T. ; Laitinen, R. ; Kinnunen, M. ; Meglinski, I. ; Kabashin, A. ; Bunker, A. ; Viitala, T. ; Hiltunen, J. (2016)

The rapid and accurate detection of food pathogens plays a critical role in the early prevention of foodborne epidemics. Current bacteria identification practices, including colony counting, polymerase chain reaction (PCR) and immunological methods, are time consuming and labour intensive; they are not ideal for achieving the required immediate diagnosis. Different SERS substrates have been stu...

Influence of Hydrolytic and Chemical Treatment on the Mechanical Properties of Aramid and Copolyaramid Fibers

Springer, H. ; Abu Obaid, A. ; Prabawa, A.B. ; Hinrichsen, G. (1998)

Commercial PPTA fibers ( Kevlar 49® and Twaron 1055®) and copolyaramid fibers (Trevar®) are subjected to various hydrolytic and chemical treatments. Tensile mod ulus, tensile strength, and elongation at break are measured, and mechanical property deterioration is compared. Copolyaramid fibers show improved hydrolytic stability and chemical resistance compared to PPTA fibers. The time dependence...

Waste management and producer responsibility: a score behind - a new ahead

Rotter, Vera Susanne (2011)

In 2001, the Organisation for Economic Co-operation and Development (OECD) defined ‘extended producer responsibility’ (EPR) as ‘(...) an environmental policy approach in which a producer’s responsibility for a product is extended to the post-consumer stage of a product’s life cycle’. The aim was to encourage adoption of EPR principles such that manufacturers would design their products to optim...

Rheological Conditions for the Development of Fibrils in Blends of Liquid Crystalline and Conventional Polymers

Roetting, O. ; Hinrichsen, G. (1997)

In blends of liquid crystalline polymers (LCP) with conventional thermoplastics, the development of infinite, thin and highly oriented LCP-fibrils is very important for a substantial mechanical reinforcement of the blends. Such fibrils can be produced by processing a coarse mixture of LCP and polyethyleneterephthalate (PET) powders in an extrusion apparatus in which preferentially elongational,...

Quasi-Continuous Fibrils in Blends of Liquid Crystalline and Thermoplastic Polymers at Low LCP Concentration

Roetting, O. ; Hinrichsen, G. (1995)

A new technique for blending liquid crystalline polymers (LCPs) with thermoplastic polymers is described. With poly(ethylene terephthalate) as the matrix and Vectra B950 as the LCP, fibers containing quasi-continuous LCP-fibrils can be produced even when the LCP-concentration is very low (1 wt.-% LCP or less). Fragmentation tests show excellent bonding between the components. The elastic modulu...

Time Response of Shape Memory Alloy Actuators

Potapov, Pavel L. ; Da Silva, Edson P. (2000)

Force/displacement actuators with the high output power and time response can be fabricated from shape memory wires or ribbons. Typically Ni-Ti shape memory alloys are used as an active material in such actuators. They are driven by Joule heating and air convection cooling. In the present work, the time response of various types of Ni-Ti actuators having different transformation temperatures an...

Formation of a carcinogenic aromatic amine from an azo dye by human skin bacteria in vitro

Platzek, T. ; Lang, C. ; Grohmann, G. ; Gi, U.-S. ; Baltes, W. (1999)

Azo dyes represent the major class of dyestuffs. They are metabolised to the corresponding amines by liver enzymes and the intestinal microflora following incorporation by both experimental animals and humans. For safety evaluation of the dermal exposure of consumers to azo dyes from wearing coloured textiles, a possible cleavage of azo dyes by the skin microflora should be considered since, in...

Inflating a Rubber Balloon

Müller, Ingo ; Struchtrup, Henning (2002)

A spherical balloon has a non-monotonic pressure-radius characteristic. This fact leads to interesting stability properties when two balloons of different radii are interconnected, see [1, 2, 3]. Here, however, we investigate what happens when a single balloon is inflated, say, by mouth. We simulate that process and show how the maximum of the pressure-radius characteristic is overcome by the p...