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Browsing by Subject "Oxygen"

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Brazing in SiH4-Doped Inert Gases: A New Approach to an Environment Friendly Production Process

Holländer, U.; Wulff, D.; Langohr, A.; Möhwald, K.; Maier, H.J. (Seoul : Korean Society for Precision Engineering, 2020)

Engineering under protective atmospheres or in vacuum allows the production of materials and components, where the absence of oxygen is an essential requirement for a successful processing. Ideally, joining or coating of ...
Effect of H2O and O2 on the adsorption and degradation of acetaldehyde on anatase surfaces - An in situ ATR-FTIR study

Melchers, Stephanie; Schneider, Jenny; Emeline, Alexei V.; Bahnemann, Detlef W. (Basel : MDPI AG, 2018)

The effect of H2O and O2 on the adsorption and degradation of gaseous acetaldehyde on the anatase TiO2 surface has been studied, in the dark and upon UV illumination, at ambient temperatures. The processes occurring at the ...
Entwicklung eines neuartigen, nicht invasiven insitu Kombi-Sensors (ISICOM) zur Überwachung des metabolischen Zustandes von Kultivierungsprozessen

Dahlmann, Katharina (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2023)

Laut der PAT-Guideline der Food and Drug Administration (FDA) in den USA aus 2004 ist eine kontinuierli-che real time Qualitätsanalyse notwendig. Durch das tiefere Verständnis soll aufgeklärt werden, wie in der Biotechnologie ...
Hydrogen Purification through a Highly Stable Dual-Phase Oxygen-Permeable Membrane

Jia, Lujian; He, Guanghu; Zhang, Yan; Caro, Jürgen; Jiang, Heqing (Weinheim : Wiley-VCH, 2021)

Using oxygen permeable membranes (OPMs) to upgrade low-purity hydrogen is a promising concept for high-purity H2 production. At high temperatures, water dissociates into hydrogen and oxygen. The oxygen permeates through ...
Identification of nitric oxide (NO)-responsive genes under hypoxia in tomato (Solanum lycopersicum L.) root

Safavi-Rizi, Vajiheh; Herde, Marco; Stöhr, Christine (London : Nature Publishing Group, 2020)

Flooding periods, as one probable consequence of climate change, will lead more frequently to plant hypoxic stress. Hypoxia sensing and signaling in the root, as the first organ encountering low oxygen, is therefore crucial ...
Identification of the surface species in electrochemical promotion: Ethylene oxidation over a Pt/YSZ catalyst

Toghan, Arafat; Greiner, Mark; Knop-Gericke, Axel; Imbihl, Ronald (Cambridge : RSC Publ., 2021)

The electrochemical promotion of the C2H4 + O2 total oxidation reaction over a Pt catalyst, interfaced to yttrium stabilized zirconia (YSZ), has been studied at 0.25 mbar and T = 650 K using near ambient pressure X-ray ...
Investigation of chip formation of Ti–6Al–4V in oxygen-free atmosphere

Denkena, Berend; Bergmann, Benjamin; Schaper, Florian (London : Springer, 2023)

Titanium and titanium alloys have high strength at low density, good corrosion resistance and excellent biocompatibility. Therefore, the use of titanium materials is well established in high-performance applications such ...
Isotope Effects in Photocatalysis: An Underexplored Issue

Günnemann, Carsten; Bahnemann, Detlef W.; Robertson, Peter K. J. (Washington, DC : ACS Publications, 2021)

In order to improve the performance of well-established photocatalysts and to develop new potential photocatalyst materials, an understanding of the underlying mechanisms of photocatalytic reactions is of the utmost ...
Lifetime degradation mechanism in boron-doped Czochralski silicon

Voronkov, Vladimir V.; Falster, Robert; Batunina, A.V.; MacDonald, D.; Bothe, Karsten; Schmidt, J. (London : Elsevier Ltd., 2011)

The recombination centre that emerges in boron- and oxygen-containing silicon was thought to be a complex of a substitutional boron atom Bs and an oxygen dimer O2. However in material co-doped with boron and phosphorus, ...
Light intensity dependence of the kinetics of the photocatalytic oxidation of nitrogen(ii) oxide at the surface of TiO2

Dillert, Ralf; Engel, Astrid; Große, Julia; Lindner, Patrick; Bahnemann, Detlef W. (Cambridge : Royal Society of Chemistry, 2013)

Air pollution by nitrogen oxides represents a serious environmental problem in urban areas where numerous sources of these pollutants are concentrated. One approach to reduce the concentration of these air pollutants is ...
Light-induced lifetime degradation in boron-doped Czochralski silicon: Are oxygen dimers involved?

Voronkov, Vladimir V.; Falster, Robert; Bothe, Karsten; Lim, Bianca (London : Elsevier Ltd., 2013)

Light-induced electron lifetime degradation in boron-doped Czochralski silicon was studied before and after a prolonged annealing at 350°C (up to 120 h) and 300°C (up to 8 weeks). Such a heat treatment is known to reduce ...
Luminescence emission from forward- and reverse-biased multicrystalline silicon solar cells

Bothe, Karsten; Ramspeck, K.; Hinken, D.; Schinke, Carsten; Schmidt, J.; Herlufsen, S.; Brendel, Rolf; Bauer, J.; Wagner, J.-M.; Zakharov, N.; Breitenstein, O. (College Park, MD : American Institute of Physics, 2009)

We study the emission of light from industrial multicrystalline silicon solar cells under forward and reverse biases. Camera-based luminescence imaging techniques and dark lock-in thermography are used to gain information ...
Observation of sonified movements engages a basal ganglia frontocortical network

Schmitz, Gerd; Mohammadi, Bahram; Hammer, Anke; Heldmann, Marcus; Samii, Amir; Münte, Thomas F.; Effenberg, Alfred O. (London : BioMed Central Ltd., 2013)

Background: Producing sounds by a musical instrument can lead to audiomotor coupling, i.e. the joint activation of the auditory and motor system, even when only one modality is probed. The sonification of otherwise mute ...
On the correlation between the oxygen in hydrogen content and the catalytic activity of cathode catalysts in PEM water electrolysis

Martin, Agate; Trinke, Patrick; van Pham, Chuyen; Bühler, Melanie; Bierling, Markus; Holzapfel, Peter K. R.; Bensmann, Boris; Thiele, Simon; Hanke-Rauschenbach, Richard (Pennington, NJ : Electrochemical Society, 2021)

Altogether five platinum group metal (PGM) and PGM-free cathode catalysts were investigated in full PEM water electrolysis cells regarding their polarisation behaviour and their hydrogen and oxygen recombination properties. ...
Polysialic acid production using Escherichia coli K1 in a disposable bag reactor

de Vries, Ingo; Busse, Christoph; Kopatz, Jens; Neumann, Harald; Beutel, Sascha; Scheper, Thomas (Weinheim : Wiley-VCH Verlag, 2017)

Polysialic acid (polySia), consisting of α-(2,8)-linked N-acetylneuraminic acid monomers plays a crucial role in many biological processes. This study presents a novel process for the production of endogenous polySia using ...
A portable biosensor for 2,4-dinitrotoluene vapors

Prante, Marc; Ude, Christian; Große, Miriam; Raddatz, Lukas; Krings, Ulrich; John, Gernot; Belkin, Shimshon; Scheper, Thomas (Basel : MDPI AG, 2018)

Buried explosive material, e.g., landmines, represent a severe issue for human safety all over the world. Most explosives consist of environmentally hazardous chemicals like 2,4,6-trinitrotoluene (TNT), carcinogenic ...
Studies on the robustness of underwater laser cutting of S355J2+N using a Yb:YAG disk laser source

Leschke, Jan; Barroi, Alexander; Kaierle, Stefan; Hermsdorf, Jörg; Overmeyer, Ludger (Amsterdam : Elsevier B.V., 2016)

In this paper, an underwater laser cutting process for maintenance and replacement operations is presented and investigated regarding process robustness for the application in rough environments. A Yb:YAG laser is used ...
Supramolecular structure of the mitochondrial oxidative phosphorylation system

Boekema, Egbert J.; Braun, Hans-Peter (Bethesda, Md. : ASBMB Publications, 2007)

The protein complexes of the mitochondrial oxidative phosphorylation system were recently reported to form supramolecular assemblies termed respiratory supercomplexes or respirasomes. These supercomplexes are considered ...
Synthesis and Characterization of 40 wt % Ce0.9Pr0.1O2–δ–60 wt % NdxSr1−xFe0.9Cu0.1O3−δ Dual-Phase Membranes for Efficient Oxygen Separation

Chen, Guoxing; Zhao, Zhijun; Widenmeyer, Marc; Yan, Ruijuan; Wang, Ling; Feldhoff, Armin; Weidenkaff, Anke (Basel : MDPI AG, 2020)

Dense, H2- and CO2-resistant, oxygen-permeable 40 wt % Ce0.9Pr0.1O2–δ–60 wt % NdxSr1−xFe0.9Cu0.1O3−δdual-phase membranes were prepared in a one-pot process. These Nd-containing dual-phase membranes have up to 60% lower ...
The effect of oxide precipitates on minority carrier lifetime in n-type silicon

Murphy, J.D.; Al-Amin, M.; Bothe, K.; Olmo, M.; Voronkov, V.V.; Falster, R.J. (College Park, MD : American Institute of Physics, 2015)

Supersaturated levels of interstitial oxygen in Czochralski silicon can lead to the formation of oxide precipitates. Although beneficial from an internal gettering perspective, oxygen-related extended defects give rise to ...

Now showing items 1-20 of 22

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