Refine
H-BRS Bibliography
- yes (50)
Departments, institutes and facilities
- Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE) (50) (remove)
Document Type
- Article (25)
- Conference Object (19)
- Part of a Book (2)
- Doctoral Thesis (2)
- Contribution to a Periodical (1)
- Part of Periodical (1)
Year of publication
- 2019 (50) (remove)
Keywords
- lignin (4)
- Extrusion blow molding (2)
- UAV (2)
- aerodynamics (2)
- antimicrobial activity (2)
- bone tissue engineering (2)
- chemometrics (2)
- dynamic vector fields (2)
- evaluation (2)
- flight zone (2)
- geofence (2)
- injection moulding (2)
- learning outcomes (2)
- modeling of complex systems (2)
- ACPYPE (1)
- ANN controller (1)
- Adams-Moulton (1)
- Aircraft (1)
- Antioxidant activity (1)
- B-splines (1)
- BDF (1)
- Basiswerkstoff (1)
- Benetzbarkeit (1)
- Biomass (1)
- CPACS (1)
- Carbohydrate (1)
- Crystallinity (1)
- Cybersecurity (1)
- Draw ratio (1)
- European horse chestnut (1)
- Exergame (1)
- Flow direction (1)
- Folin–Ciocalteu assay (1)
- Force field (1)
- Führungspositionen (1)
- Geometry (1)
- Gitter-Boltzmann-Methode (1)
- Glycam06 (1)
- Gordon surface (1)
- Grid Control (1)
- Grid Stability (1)
- Gromacs (1)
- HSQC NMR (1)
- Heart Rate Prediction (1)
- Horizontale und vertikale Segmentation (1)
- Indirect Encodings (1)
- Information and Communication Technologies (1)
- Integrative simulation (1)
- Internet of Things (1)
- Inverter (1)
- Journalistinnen (1)
- Kontaktwinkel (1)
- Kraft lignin (1)
- Lattice Boltzmann method (1)
- Lignocellulose feedstock (1)
- MAP-Elites (1)
- MOOC (1)
- Medienproduktion (1)
- Miscanthus (1)
- Miscanthus x giganteus (1)
- Mold temperature (1)
- Naturkautschuk (1)
- Neuroevolution (1)
- Nonbonded scaling factor (1)
- Organosolv lignin (1)
- Orthotropic material behavior (1)
- Paulownia (1)
- Phasenübergang (1)
- Prediction of physiological responses to strain (1)
- Process dependent material parameters (1)
- Quality Diversity (1)
- Quotierung (1)
- Rheometer (1)
- Shan-Chen (1)
- Silphium (1)
- Storage modulus (1)
- Taylor-Green (1)
- Total phenol content (1)
- UV spectrum (1)
- Vulkanisation (1)
- V˙CO2 prediction (1)
- V˙O2 prediction (1)
- West Africa (1)
- Western Africa (1)
- Wireless sensor networks (1)
- active packaging (1)
- additive (1)
- advanced applications (1)
- agarose (1)
- angiogenesis (1)
- antimicrobial (1)
- antioxidant (1)
- antiradical activity (1)
- applications (1)
- artificial neural networks (1)
- atmospheric aerosol (1)
- biobased (1)
- biocomposite (1)
- biomass (1)
- brilliant green (1)
- brushless motors (1)
- bulk and local viscoelastic properties (1)
- cell harvesting (1)
- cell migration (1)
- chitosan (1)
- coefficient of thermal expansion (1)
- collaborative learning (1)
- composites (1)
- control (1)
- cross-disciplinary (1)
- cross-evaluation (1)
- crystal violet (1)
- demethylation (1)
- diversity (1)
- drone video quality (1)
- drug release (1)
- endothelial cells (1)
- energy efficiency (1)
- energy meteorology (1)
- extraction (1)
- extrusion blow molding (1)
- first-semester students (1)
- fitness-fatigue model (1)
- food loss (1)
- gamification (1)
- gas transport networks (1)
- genotype (1)
- globally convergent solvers (1)
- hands-on experiences (1)
- holistic learning (1)
- hydrogel (1)
- hydroxyapatite (1)
- hydroxypropylmethylcellulose (1)
- intercultural learning (1)
- international (1)
- international teams (1)
- lignocellulosic feedstock (1)
- low-input crops (1)
- mathematical chemistry (1)
- mathematical modeling (1)
- microindentation (1)
- monolignol ratio (1)
- motor drive (1)
- multidisciplinary (1)
- multistep (1)
- multivariate data analysis (1)
- observational data and simulations (1)
- organosolv (1)
- osteogenesis (1)
- pathogenic microorganisms (1)
- performance modeling (1)
- performance prediction (1)
- permanent magnet motors (1)
- plastic manufacturing (1)
- polyphenols (1)
- polysaccharide (1)
- polyurethane coatings (1)
- practical learning (1)
- principal component analysis (1)
- proanthocyanidins (1)
- processing-structure-property relationship (1)
- project-based learning (1)
- prototype apparatus (1)
- radio transceivers (1)
- scratch assay (1)
- seed coat (1)
- self-assessment (1)
- sensor systems (1)
- serious games (1)
- size exclusion chromatography (1)
- smart agriculture (1)
- solar power (1)
- stability (1)
- stem cells (1)
- sustainability (1)
- temperature control (1)
- temporal discretization (1)
- time integration (1)
- topological reduction (1)
- training performance relationship (1)
- trapezoidal rule (1)
- triphenylmethane dyes (1)
- welfare technology (1)
- wound healing assay (1)
The need for innovation around the control functions of inverters is great. PV inverters were initially expected to be passive followers of the grid and to disconnect as soon as abnormal conditions happened. Since future power systems will be dominated by generation and storage resources interfaced through inverters these converters must move from following to forming and sustaining the grid. As “digital natives” PV inverters can also play an important role in the digitalisation of distribution networks. In this short review we identified a large potential to make the PV inverter the smart local hub in a distributed energy system. At the micro level, costs and coordination can be improved with bidirectional inverters between the AC grid and PV production, stationary storage, car chargers and DC loads. At the macro level the distributed nature of PV generation means that the same devices will support both to the local distribution network and to the global stability of the grid. Much success has been obtained in the former. The later remains a challenge, in particular in terms of scaling. Yet there is some urgency in researching and demonstrating such solutions. And while digitalisation offers promise in all control aspects it also raises significant cybersecurity concerns.
Lignocellulose feedstock (LCF) provides a sustainable source of components to produce bioenergy, biofuel, and novel biomaterials. Besides hard and soft wood, so-called low-input plants such as Miscanthus are interesting crops to be investigated as potential feedstock for the second generation biorefinery. The status quo regarding the availability and composition of different plants, including grasses and fast-growing trees (i.e., Miscanthus, Paulownia), is reviewed here. The second focus of this review is the potential of multivariate data processing to be used for biomass analysis and quality control. Experimental data obtained by spectroscopic methods, such as nuclear magnetic resonance (NMR) and Fourier-transform infrared spectroscopy (FTIR), can be processed using computational techniques to characterize the 3D structure and energetic properties of the feedstock building blocks, including complex linkages. Here, we provide a brief summary of recently reported experimental data for structural analysis of LCF biomasses, and give our perspectives on the role of chemometrics in understanding and elucidating on LCF composition and lignin 3D structure.
The antiradical and antimicrobial activity of lignin and lignin-based films are both of great interest for applications such as food packaging additives. The polyphenolic structure of lignin in addition to the presence of O-containing functional groups is potentially responsible for these activities. This study used DPPH assays to discuss the antiradical activity of HPMC/lignin and HPMC/lignin/chitosan films. The scavenging activity (SA) of both binary (HPMC/lignin) and ternary (HPMC/lignin/chitosan) systems was affected by the percentage of the added lignin: the 5% addition showed the highest activity and the 30% addition had the lowest. Both scavenging activity and antimicrobial activity are dependent on the biomass source showing the following trend: organosolv of softwood > kraft of softwood > organosolv of grass. Testing the antimicrobial activities of lignins and lignin-containing films showed high antimicrobial activities against Gram-positive and Gram-negative bacteria at 35 °C and at low temperatures (0-7 °C). Purification of kraft lignin has a negative effect on the antimicrobial activity while storage has positive effect. The lignin release in the produced films affected the activity positively and the chitosan addition enhances the activity even more for both Gram-positive and Gram-negative bacteria. Testing the films against spoilage bacteria that grow at low temperatures revealed the activity of the 30% addition on HPMC/L1 film against both B. thermosphacta and P. fluorescens while L5 was active only against B. thermosphacta. In HPMC/lignin/chitosan films, the 5% addition exhibited activity against both B. thermosphacta and P. fluorescens.
The paper presents the topological reduction method applied to gas transport networks, using contraction of series, parallel and tree-like subgraphs. The contraction operations are implemented for pipe elements, described by quadratic friction law. This allows significant reduction of the graphs and acceleration of solution procedure for stationary network problems. The algorithm has been tested on several realistic network examples. The possible extensions of the method to different friction laws and other elements are discussed.
Miscanthus x giganteus Stem Versus Leaf-Derived Lignins Differing in Monolignol Ratio and Linkage
(2019)
As a renewable, Miscanthus offers numerous advantages such as high photosynthesis activity (as a C4 plant) and an exceptional CO2 fixation rate. These properties make Miscanthus very attractive for industrial exploitation, such as lignin generation. In this paper, we present a systematic study analyzing the correlation of the lignin structure with the Miscanthus genotype and plant portion (stem versus leaf). Specifically, the ratio of the three monolignols and corresponding building blocks as well as the linkages formed between the units have been studied. The lignin amount has been determined for M. x giganteus (Gig17, Gig34, Gig35), M. nagara (NagG10), M. sinensis (Sin2), and M. robustus (Rob4) harvested at different time points (September, December, and April). The influence of the Miscanthus genotype and plant component (leaf vs. stem) has been studied to develop corresponding structure-property relationships (i.e., correlations in molecular weight, polydispersity, and decomposition temperature). Lignin isolation was performed using non-catalyzed organosolv pulping and the structure analysis includes compositional analysis, Fourier transform infradred (FTIR), ultraviolet/visible (UV-Vis), hetero-nuclear single quantum correlation nuclear magnetic resonsnce (HSQC-NMR), thermogravimetric analysis (TGA), and pyrolysis gaschromatography/mass spectrometry (GC/MS). Structural differences were found for stem and leaf-derived lignins. Compared to beech wood lignins, Miscanthus lignins possess lower molecular weight and narrow polydispersities (<1.5 Miscanthus vs. >2.5 beech) corresponding to improved homogeneity. In addition to conventional univariate analysis of FTIR spectra, multivariate chemometrics revealed distinct differences for aromatic in-plane deformations of stem versus leaf-derived lignins. These results emphasize the potential of Miscanthus as a low-input resource and a Miscanthus-derived lignin as promising agricultural feedstock.
Herein we report an update to ACPYPE, a Python3 tool that now properly converts AMBER to GROMACS topologies for force fields that utilize nondefault and nonuniform 1–4 electrostatic and nonbonded scaling factors or negative dihedral force constants. Prior to this work, ACPYPE only converted AMBER topologies that used uniform, default 1–4 scaling factors and positive dihedral force constants. We demonstrate that the updated ACPYPE accurately transfers the GLYCAM06 force field from AMBER to GROMACS topology files, which employs non-uniform 1–4 scaling factors as well as negative dihedral force constants. Validation was performed using β-d-GlcNAc through gas-phase analysis of dihedral energy curves and probability density functions. The updated ACPYPE retains all of its original functionality, but now allows the simulation of complex glycomolecular systems in GROMACS using AMBER-originated force fields. ACPYPE is available for download at https://github.com/alanwilter/acpype.
Synthesis of Substituted Hydroxyapatite for Application in Bone Tissue Engineering and Drug Delivery
(2019)
It is shown that the electrochemical kinetics of alkaline methanol oxidation can be reduced by setting certain fast reactions contained in it to a steady state. As a result, the underlying system of Ordinary Differential Equations (ODE) is transformed to a system of Differential-Algebraic Equations (DAE). We measure the precision characteristics of such transformation and discuss the consequences of the obtained model reduction.