A5009531475- Inorganic Chemistry and Materials
- Refrigeration and Air Conditioning Technologies
- Inorganic Fluorides and Related Compounds
- Advanced Thermodynamic Systems and Engines
- Rare-earth and actinide compounds
- Heat Transfer and Optimization
- Crystal Structures and Properties
- Advanced Condensed Matter Physics
- Iron-based superconductors research
- Thermodynamic and Exergetic Analyses of Power and Cooling Systems
- Modeling and Simulation Systems
- Magnetism in coordination complexes
- Electric and Hybrid Vehicle Technologies
- Advanced Sensor Technologies Research
- Advanced Battery Technologies Research
- Ferroelectric and Piezoelectric Materials
- Phase Equilibria and Thermodynamics
- Aerodynamics and Fluid Dynamics Research
- Microwave Dielectric Ceramics Synthesis
- Solid-state spectroscopy and crystallography
- Semiconductor materials and devices
- Electronic and Structural Properties of Oxides
- Vehicle emissions and performance
- Advanced Chemical Physics Studies
- Membrane Separation Technologies
Technische Universität Braunschweig
2012-2024
Norfolk State University
2006-2016
University of Stuttgart
2011-2015
Northern Illinois University
2012
Brookhaven National Laboratory
1998-2006
Industrial Union of Metalworkers
2001
Technical University of Darmstadt
1997
Stockholm University
1992
Freie Universität Berlin
1987
Abstract The additional energy stabilization due to cooperative effects was calculated in extended hydrogen bonded systems OH ⃛OH with unidirectional (homodromic) orientation of the groups. Ab initio restricted Hartree Fock, MP2 and MP3 calculations geometry optimization BSSE correction have been performed using GAUSSIAN 83 program package for ground states linear water dimer C s symmetry cyclic tetramer S 4 symmetry. latter represents smallest possible, experimentally observed structure....
Lithium-ion battery cells with high energy density are widely used in today’s electric vehicles. However, thermal runaway (TR) of a cell is still major safety issue the use lithium-ion batteries automotive sector. In particular, variability TR, which not yet fully understood, can lead to significant issues. This paper investigates individual decomposition reactions during TR and their influence on overall scattering behavior. Therefore, differential scanning calorimetry (DSC) measurements...
The aim of this paper is to develop the technical knowledge, especially optimum geometries, for design and manufacturing a supersonic gas–gas ejector waste-heat driven vehicle cooling system. Although several studies have been performed investigate effects geometrical configurations ejectors, progressive methodology an compressor application system has not yet described. First, analytical model calculation geometry wide range operating conditions developed, using R134a as working fluid with...
To achieve high efficiency and low degradation of a polymer electrolyte fuel cell (PEMFC), it is necessary to maintain an appropriate level humidification in the membrane. Thus, membrane humidifiers are typically used PEMFC systems. Parameter studies important evaluate under various operating conditions reduce amount physical tests. However, simulative computationally expensive when using detailed models. computational cost, surrogate models set up. In our study, 3D fluid dynamics (CFD)...
This paper investigates the significance of thermal management energy consumption on range electric vehicles. It is necessary to combine models powertrain components such as machine, power electronics and high voltage battery that take into account trip-based information containing a predicted speed profile elevation data with system has ability incorporate losses powertrain. The refers sum all within refrigeration cycle vehicle well associated control strategy. Based results real world...
Previous investigations by other authors, e.g. Lorentzen [1], have shown that in a conventional refrigeration cycle significant throttling losses occurs. With the help of an ejector, these can be reduced. As result, energetic efficiency (COP) refrigerant system will improved. Investigations show CO2 ejector cycles are feasible and some systems already been commercialized successfully. The key issues optimization used geometries different parts. To optimize geometry, deeper understanding...
Ab initio molecular orbital methods have been used for calculations of interaction parameters the UNIQUAC and NRTL activity coefficient model to predict phase equilibria in system nitrogen–ethane. The with ab parameters, calculated on MP4 QCISD(T) theory level, different gE-mixing rules high-pressure vapor–liquid- (VLE) vapor–liquid–liquid-equilibria (VLLE) by Peng–Robinson Soave–Redlich–Kwong equation state. results compared predictions based UNIFAC PSRK-mixing rule. using initio-UNIQUAC...
For high efficiency compact heat exchangers one needs to gain detailed knowledge of the distribution local transfer. a profound assessment enhancing mechanisms like secondary flow structures which are often found at rather small scales it is necessary perform transfer measurements with spatial resolution. A technique that satisfies this need ammonia absorption method (AAM). It based on analogy between and mass The here presented paper describes new calibration approach for AAM. done through...