Fak. 3 Prozesswissenschaften

1349 Items

Recent Submissions
Processing Effects on the Formability of Magnesium Alloy Sheets

Bohlen, Jan ; Cano, Guadalupe ; Drozdenko, Daria ; Dobron, Patrik ; Kainer, Karl ; Gall, Sven ; Müller, Sören ; Letzig, Dietmar (2018-02-23)

As a generalized semi-finished product, the use of magnesium sheets requires addressing two major aspects of their processing: their microstructure and texture control, which are both essential for the forming behavior of such sheets during their forming to parts. Further, the processing of such sheets is complex, and therefore expensive, and requires simplification. In this work, magnesium all...

Imaging with Polarized Neutrons

Kardjilov, Nikolay ; Hilger, André ; Manke, Ingo ; Strobl, Markus ; Banhart, John (2018-01-16)

Owing to their zero charge, neutrons are able to pass through thick layers of matter (typically several centimeters) while being sensitive to magnetic fields due to their intrinsic magnetic moment. Therefore, in addition to the conventional attenuation contrast image, the magnetic field inside and around a sample can be visualized by detecting changes of polarization in a transmitted beam. The ...

A Comparative Exergoeconomic Evaluation of the Synthesis Routes for Methanol Production from Natural Gas

Blumberg, Timo ; Morosuk, Tatiana ; Tsatsaronis, George (2017-11-24)

Methanol is one of the most important feedstocks for the chemical, petrochemical, and energy industries. Abundant and widely distributed resources as well as a relative low price level make natural gas the predominant feedstock for methanol production. Indirect synthesis routes via reforming of methane suppress production from bio resources and other renewable alternatives. However, the convent...

Erweiterung einer Berechnungsmethode für die Regelung von Absorptionskälteanlagen

Albers, Jan (2019)

Zielstellung für eine erweiterte Methode der charakteristischen Gleichungen ist es, die bisher bekannte Berechnungsmethodik soweit zu verfeinern, dass sie auch für die reale Steuerung und Regelung von einstufigen H2O/LiBr-Absorptionskälteanlagen genutzt werden kann. Dies erfordert eine genauere Beschreibung des Leistungsverhaltens unter verschiedenen praxisrelevanten Randbedingungen (wie z.B. v...

Quantification and isotherm modelling of competitive phosphate and silicate adsorption onto micro-sized granular ferric hydroxide

Hilbrandt, Inga ; Lehmann, Vito ; Zietzschmann, Frederik ; Ruhl, Aki Sebastian ; Jekel, Martin (2019-07-30)

Adsorption onto ferric hydroxide is a known method to reach very low residual phosphate concentrations. Silicate is omnipresent in surface and industrial waters and reduces the adsorption capacity of ferric hydroxides. The present article focusses on the influences of silicate concentration and contact time on the adsorption of phosphate to a micro-sized iron hydroxide adsorbent (μGFH) and fits...

Product Environmental Footprint (PEF) Pilot Phase—Comparability over Flexibility?

Bach, Vanessa ; Lehmann, Annekatrin ; Görmer, Marcel ; Finkbeiner, Matthias (2018-08-15)

The main goal of the European product environmental footprint (PEF) method is to increase comparability of environmental impacts of products within certain product categories by decreasing flexibility and therefore achieving reproducibility of results. Comparability is supposed to be further increased by developing product category specific rules (PEFCRs). The aim of this paper is to evaluate i...

In Operando Neutron Radiography Analysis of a High-Temperature Polymer Electrolyte Fuel Cell Based on a Phosphoric Acid-Doped Polybenzimidazole Membrane Using the Hydrogen-Deuterium Contrast Method

Lin, Yu ; Arlt, Tobias ; Kardjilov, Nikolay ; Manke, Ingo ; Lehnert, Werner (2018-08-24)

In order to characterize high temperature polymer electrolyte fuel cells (HT-PEFCs) in operando, neutron radiography imaging, in combination with the deuterium contrast method, was used to analyze the hydrogen distribution and proton exchange processes in operando. These measurements were then combined with the electrochemical impedance spectroscopy measurements. The cell was operated under dif...

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

Zoder, Marius ; Balke, Janosch ; Hofmann, Mathias ; Tsatsaronis, George (2018-09-30)

State-of-the-art thermodynamic simulation of energy conversion processes requires proprietary software. This article is an attempt to refute this statement. Based on object-oriented programming a simulation and exergy analysis of a combined cycle gas turbine is carried out in a free and open-source framework. Relevant basics of a thermodynamic analysis with exergy-based methods and necessary fl...

Assessing Child Development: A Critical Review and the Sustainable Child Development Index (SCDI)

Chang, Ya-Ju ; Schneider, Laura ; Finkbeiner, Matthias (2015-04-24)

Children are an important stakeholder group for sustainable development, as they represent the interface between current and future generations. A comprehensive assessment of child development (CD) in the context of sustainable development is still missing. In this paper, as a first step, a literature review is conducted to identify relevant aspects and gaps related to the assessment of CD. The...

Toxicity Assay for Citrinin, Zearalenone and Zearalenone-14-Sulfate Using the Nematode Caenorhabditis elegans as Model Organism

Keller, Julia ; Borzekowski, Antje ; Haase, Hajo ; Menzel, Ralph ; Rueß, Liliane ; Koch, Matthias (2018-07-09)

To keep pace with the rising number of detected mycotoxins, there is a growing need for fast and reliable toxicity tests to assess potential threats to food safety. Toxicity tests with the bacterial-feeding nematode Caenorhabditis elegans as the model organism are well established. In this study the C. elegans wildtype strain N2 (var. Bristol) was used to investigate the toxic effects of the fo...

The calcineurin inhibitor cyclosporine A activates the renal Na-(K)-Cl cotransporters via local and systemic mechanisms

Blankenstein, Katharina Ilse (2019)

The two calcineurin inhibitors (CNIs) cyclosporine A (CsA) and tacrolimus are potent immunosuppressive drugs that have become indispensable in the post-transplantational therapy and in the treatment of autoimmune diseases. Immunosuppression via CNIs is achieved by inhibition of the calcineurin phosphatase and thus blocking the signaling pathway of NFAT (nuclear factor of activated T cells), the...

Wavelength-selective neutron imaging for materials science

Al-Falahat, Ala'a (2019)

Neutron imaging, specifically radiography and tomography, is nowadays widely used technique for non-destructive investigations of materials and is commonly utilized for various applications in the field of engineering science and technology. The neutron imaging experiments presented in this work were conducted at the neutron imaging facility CONRAD-2 and at the ESS test beamline instrument V20 ...

Bioengineering of a Full-Thickness Skin Equivalent in a 96-Well Insert Format for Substance Permeation Studies and Organ-On-A-Chip Applications

Schimek, Katharina ; Hsu, Hao-Hsiang ; Boehme, Moritz ; Kornet, Jacob Jan ; Marx, Uwe ; Lauster, Roland ; Pörtner, Ralf ; Lindner, Gerd (2018-06-07)

The human skin is involved in protecting the inner body from constant exposure to outer environmental stimuli. There is an evident need to screen for toxicity and the efficacy of drugs and cosmetics applied to the skin. To date, animal studies are still the standard method for substance testing, although they are currently controversially discussed Therefore, the multi-organ chip is an attracti...

Influence of the Heating Rate on the Foaming Behavior of Various Aluminium Alloys

Neu, Tillmann Robert ; Pfretzschner, Beate ; García-Moreno, Francisco ; Banhart, John (2017-08-23)

Powders of metallurgically prepared precursors expand to a foam differently depending on how fast they are heated to their foaming temperature. The foaming behavior of four alloys was studied with heating rates varying from 0.1 K/s to 18 K/s. It was found that each alloy shows its own non-linear behavior of expansion values. Alloys not containing magnesium exhibit a maximum at intermediate heat...

Zinc and Sepsis

Alker, Wiebke ; Haase, Hajo (2018-07-27)

Sepsis, defined as a “life-threatening organ dysfunction caused by a dysregulated host-response to infection” is a major health issue worldwide and still lacks a fully elucidated pathobiology and uniform diagnostic tests. The trace element zinc is known to be crucial to ensure an appropriate immune response. During sepsis a redistribution of zinc from serum into the liver has been observed and ...

A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

Wang, Ligang ; Yang, Zhiping ; Sharma, Shivom ; Mian, Alberto ; Lin, Tzu-En ; Tsatsaronis, George ; Maréchal, François ; Yang, Yongping (2018-12-27)

To reach optimal/better conceptual designs of energy systems, key design variables should be optimized/adapted with system layouts, which may contribute significantly to system improvement. Layout improvement can be proposed by combining system analysis with engineers’ judgments; however, optimal flowsheet synthesis is not trivial and can be best addressed by mathematical programming. In additi...

Antifungal Peptides of the AFP Family Revisited: Are These Cannibal Toxins?

Meyer, Vera ; Jung, Sascha (2018-06-02)

The emergence and spread of pathogenic fungi resistant to currently used antifungal drugs represents a serious challenge for medicine and agriculture. The use of smart antimicrobials, so-called “dirty drugs” which affect multiple cellular targets, is one strategy to prevent resistance. Of special interest is the exploitation of the AFP family of antimicrobial peptides, which include its foundin...

Use Cases with Economics and Simulation for Thermo-Chemical District Networks

Geyer, Philipp ; Delwati, Muhannad ; Buchholz, Martin ; Giampieri, Alessandro ; Smallbone, Andrew ; Roskilly, Anthony P. ; Buchholz, Reiner ; Provost, Mathieu (2018-02-26)

Thermo-chemical networks using absorption and desorption to capture and valorise the potential of very low-grade residual heat (20 °C to 60 °C) to offer a reduction of end user costs and increased primary energy efficiency. The paper demonstrates the technical and economic potential of thermo-chemical networks by defining use cases and their related level of energy efficiency and technological ...

Blockchain Technology and Electricity Wholesale Markets: Expert Insights on Potentials and Challenges for OTC Trading in Europe

Dick, Carol Inoue ; Praktiknjo, Aaron (2019-03-02)

In this manuscript, we investigate the adoption of blockchain for over-the-counter (OTC) electricity wholesale trading under the EU regulatory framework. Our analysis of the core legislation reveals six potential issues: (1) data immutability-related error correction, (2) personal data protection and immutability, (3) access to different data layers, (4) obligation and capacity to report, (5) i...

Assessing the Ability of the Cradle to Cradle Certified™ Products Program to Reliably Determine the Environmental Performance of Products

Bach, Vanessa ; Minkov, Nikolay ; Finkbeiner, Matthias (2018-05-14)

Concepts and tools supporting the design of environmentally friendly products (including materials, goods or services) have increased over the last years. The Cradle to Cradle Certified™ Products Program (C2CP) is one of these approaches. In this work, the ability of C2CP to reliably determine the environmental performance of products was analyzed through the application of a criteria-based ass...