A5062638792- Chemistry and Chemical Engineering
- Synthetic Organic Chemistry Methods
- Semiconductor materials and devices
- Corrosion Behavior and Inhibition
- Asymmetric Synthesis and Catalysis
- Ferroelectric and Negative Capacitance Devices
- Organometallic Complex Synthesis and Catalysis
- Carbohydrate Chemistry and Synthesis
- Advanced Memory and Neural Computing
- Organoboron and organosilicon chemistry
- Electronic and Structural Properties of Oxides
- Inorganic and Organometallic Chemistry
- Chemical synthesis and alkaloids
- Traditional and Medicinal Uses of Annonaceae
- Marine Sponges and Natural Products
- Metal and Thin Film Mechanics
- Concrete Corrosion and Durability
- Organic Chemistry Cycloaddition Reactions
- Rheology and Fluid Dynamics Studies
- Flavonoids in Medical Research
- Karst Systems and Hydrogeology
- Erosion and Abrasive Machining
- Synthesis and pharmacology of benzodiazepine derivatives
- Axial and Atropisomeric Chirality Synthesis
- Ferrocene Chemistry and Applications
University of Freiburg
2007-2023
RWTH Aachen University
1996-2022
Gheorghe Asachi Technical University of Iași
2020
Fraunhofer Institute for Material and Beam Technology
2019
Technische Universität Dresden
2019
TU Dortmund University
2003-2018
Max Planck Institute for Biophysical Chemistry
2014
Wageningen University & Research
2011
Stellar Solutions (United States)
2011
Rose–Hulman Institute of Technology
2002
Abstract Resistive switching based on transition metal oxide memristive devices is suspected to be caused by the electric‐field‐driven motion and internal redistribution of oxygen vacancies. Deriving detailed mechanistic picture process complicated, however, frequently observed influence surrounding atmosphere. Specifically, presence or absence water vapor in atmosphere has a strong impact properties, but redox reactions between active layer have yet clarified. To investigate role species...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimethyldioxirane Oxidation of Titanium Enolates: Diastereoselective .alpha.-HydroxylationsWaldemar Adam, Michael Mueller, and Frank PrechtlCite this: J. Org. Chem. 1994, 59, 9, 2358–2364Publication Date (Print):May 1, 1994Publication History Published online1 May 2002Published inissue 1 1994https://pubs.acs.org/doi/10.1021/jo00088a015https://doi.org/10.1021/jo00088a015research-articleACS PublicationsRequest reuse permissionsArticle...
Abstract New data on the fracture mechanical properties (Young’s modulus, stress, strain, internal intrinsic and adhesion) electrical resistance of iron carbonate scales from CO2 corrosion carbon steel are reported discussed with respect to mechanistic considerations localized attack in corrosion. The cracking spalling is primarily due stresses. Inhibitors influence by reducing thickness their growth FILC initiated at sites local if critical flow intensities prevent reformation protective...
The diffusion of oxygen in dense ceramics monoclinic HfO2 was studied by means (18O/16O) isotope exchange annealing and subsequent determination depth profiles Secondary Ion Mass Spectrometry. Anneals were performed the temperature range 573 ≤T/K≤ 973 at an partial pressure pO2=200 mbar. All measured exhibited two features: first feature, closer to surface, attributed mainly slow impurity silicate phase; second deeper sample, bulk HfO2. activation enthalpy tracer found be ΔHD∗≈0.5 eV.
Abstract A probabilistic model for the prediction of flow induced localized corrosion (FILC) has been developed which correlates hydrodynamic forces exerted onto product scales with fracture stress scales. The is based on hypothesis that FILC initiated by near-wall turbulence elements above critical intensities are expressed in terms wall shear stresses. boundary conditions growth a microcrack scale verified measured mechanics data iron carbonate from CO2 low alloy steel. drag reducing...
Abstract The high‐mobility, wide‐bandgap perovskite oxide BaSnO 3 is taken as a model system to demonstrate that the native point defects present in un‐doped, epitaxial thin films grown by hybrid molecular beam epitaxy can be identified and their concentrations at ppm level determined quantitatively. An elevated‐temperature, multi‐faceted approach shown necessary: oxygen tracer diffusion experiments with secondary ion mass spectrometry analysis; dynamics simulations of oxygen‐vacancy...
Though present in small amounts and migrating at low rates, intrinsic cation defects play a central role governing the operational lifetime of oxide-ion conducting materials through slow degradation processes such as interdiffusion, kinetic demixing, grain growth, creep. In this study, new experimental approach to characterizing behavior slow-moving, minority is presented. Diffusion probed samples with constant cation-defect concentration well above equilibrium values. This applied...
The point-defect structure of monoclinic HfO2 (m-HfO2) was studied by means equilibrium electrical conductance measurements as a function temperature 1050≤T/K≤1200 and oxygen partial pressure −20≤log(pO2/bar)≤−2. total conductivity σ displayed similar behavior at each examined. In oxidizing conditions (pO2≥10−7bar), the increased with increasing assigned to hole conduction. Around 10−10 bar, region almost constant found; this is ascribed ionic conduction doubly charged vacancies. reducing...
Advanced Manufacturing (AM) has the potential to improve existing technologies and applications in terms of performance, light-weighting costs. In context SME4ALM initiative, launched by DLR ESA, company Kampf Telescope Optics GmbH (KTO) cooperation with Fraunhofer Institute for Material Beam Technology (IWS) have assessed feasibility AM build a high-performance optical mirror space applications. For assessment potentials, design concept cryogenic instruments observations IR NIR range was...
Abstract Upper Ordovician Arthur Marble and Oligocene Takaka Limestone contain extensive phreatic cave systems beneath the valley Golden Bay. Half of all water flows in pass through subterranean drainage conduits carbonate rock. New Zealand's largest freshwater springs, Waikoropupu Springs, are one surface expression these karst systems. Other characteristics dolines submarine springs. A paleocave system developed during formation northwest Nelson peneplain Late Cretaceous early Tertiary....
A simple procedure for the post buckling analysis is shown. In comparison to arc length method no additional variable required. The algorithm finds solution a prescribed time step. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at glance that was extracted from about 200 leading journals. To access of an article which published elsewhere, please select “Full Text” option. The original trackable via the “References”
Abstract Critical flow intensities expressed in terms of critical wall shear stresses for initiation induced localized corrosion (FILC) at carbon steel under CO2 conditions (1 M NaCl, 5 bar CO2, 80°C) were evaluated using the submerged jet impingement method. Flow independent pitting facilitates FILC uninhibited systems already below 0.2 Pa. If is prevented by inhibitors can be clearly identified. They depend on type and concentration inhibitor. In presence an aromatic quat found 250 The...
Groundwater at an abandoned industrial area near Bergamo, Italy, was historically contaminated by tetrachloroethylene (PCE) (>100 µg/L) and, to a lesser extent, trichlorethylene (TCE), dichloropropane (DP) and 1,1,2,2-tetrachloroethane (R-130).A liquid reagent (EHC ® Liquid) selected for remediation of groundwater the site.The is provided in two parts: EHC Liquid Mix (a soluble organo-iron salt), ELS Microemulsion lecithin-based carbon substrate), designed promote both situ chemical...
Abstract For see ChemInform in Full Text.
Abstract The racemic erythro form of mefloquine is applied as an important anti malaria drug.
Abstract The drag reducing effect of corrosion inhibitors was measured at a microelectrode array incorporated flush into surface impinged with submerged jet. measurements were performed under mass transport control the hexacyanoferrate(II)/(III) redox system. N-(2-methylenenaphthyl)-quinolinium bromide (MNQB) yielded factor 0.5 concentrations mM, and trimethylammonium chlorides C12-18 chain yield factors 0.2 above their critical micelle concentration. Critical inhibitor from electrochemical...
Abstract The innate immune system safeguards the host from invading microorganisms by eliciting carefully measured responses. For example, weaker responses are mounted to dead than viable microorganisms, a property with important implications for vaccination and defense. Pathogen associated molecular patterns (PAMPs), which serve alert system, present in bacteria, raising question as how discriminates between two. Here we show that can directly sense bacterial viability through detection of...