engineering

Engines, aircraft engines or gas turbines are just a few examples of technical combustion systems. The energy chemically bound in the fuel is converted into other forms of energy with the help of a combustion process. Combustion control is crucial to develop efficient and low-emission systems. As a prediction tool, computer simulation is already making a major contribution that will continue to grow in the future. The simultaneous further development of turbulence and combustion models is crucial in order to...

The interaction of flames and combustion chamber walls occurs in almost all common technical combustion systems. Incomplete combustion leads to an increased formation of pollutants in the area close to the wall. Current developments to increase the efficiency of internal combustion engines and aircraft engines are often based on reducing combustion chambers while maintaining or increasing performance. The more compact combustion chambers increase the surface-to-volume ratio, so that the flame-wall interaction will become more important in future combustion system developments....

The use of mobile devices and the sale of mobile applications/applications (apps) continue to increase rapidly. It is expected that smartphones will soon replace computers and laptops as the most used end device. These trends result in new challenges for companies across all industries, which put great pressure on them. The only way companies can withstand this pressure and stay competitive is to develop their own mobile strategy and ensure that strategy is aligned with overall corporate strategy. On the...

This book is dedicated to writing pseudocodes that have been tested using the matlab programming language. These pseudocodes are universal and will be implemented in other programming languages. The book starts with the presentation of elementary algorithms, covers linear algebra and matrix based linear optimization algorithms. The goal of this book is to teach algorithms by giving their standard description and providing a mathematical measure on the research field of dynamic partial reconguration ( DPR ) and FPGA implementation of...

This book presents new techniques that allow the automatic verification and generation of abstract human-style proofs. The core of this approach builds an efficient calculus that works directly by applying definitions, theorems, and axioms, which reduces the size of the underlying proof object by a factor of ten. The calculus is extended by the deep inference paradigm which allows the application of inference rules at arbitrary depth inside logical expressions and provides new proofs that are exponentially shorter and not...

This work considers the simulation of premixed combustion with regard to the application in stationary gas turbines and future aero engines. With respect to the pollutant reduction of current devices as well as complementary technologies in the context of renewable energies, premixed flames are of increasing importance but exhibit reduced stability properties compared to conventional non-premixed systems. Regarding this, the simulation can provide detailed insight into the physical mechanisms for scientific research as well as help in the design of...

Coal has been mined and extracted worldwide for some time. This raw material, which has been described as the engine of industrialization, is mainly used for power generation and steel production and gives countries with sufficient reserves an important position in the world economy by being able to produce their own energy. Germany is one of the countries with the highest coal reserves in the world. RAG Deutsche Steinkohle is part of the RAG Aktiengesellschaft group of companies and is...

Today, batteries serve as a power supply for almost every electronic device which people carry around or install in locations that have no access to the mains. The longer a battery powered system can operate without need for recharge or battery replacement, the more will maintenance cost and the number of faults due to insufficient power supply decrease. This work considers multiple independent software tasks that are assigned to the same processor. The tasks are supposed to have hard deadlines...

A water pipe that purifies its contents as it flows? A coating that breaks down air pollutants as they flow by? A surface that disinfects itself and keeps itself clean? What sounds like science fiction becomes possible with the photocatalyst titanium dioxide. Under UV light, titanium dioxide is able to purify air and water, kill bacteria on its surface and break down fats. Although these properties have been known since the 1970s, the breakthrough of photocatalytically active titanium dioxide is...

This book studies methods of enhancing both data rates and power efficiencies of analog frontends for high-speed optical communication systems. Performance measures for high-speed broadband circuits and the efficiency of frequency compensation methods are evaluated. Power-efficient speed enhancement such as inductive peaking, feedback and negative Miller Capacitances, as well as the method of inductive broadband output matching are analyzed in detail. New methods for the design of power-efficient high-speed broadband amplifiers are developed. Circuit design examples intended for use in...

ver the past decades, a world without private vehicles and the associated individualization of mobility has become more and more unimaginable for the very most of us. The worldwide quantity of vehicles running with a combustion engine still keeps on growing to numbers far beyond belief, but equally do the problems, provoked by this evolution - political, economical and environmental problems that show our overall dependency on petroleum. Can the electric vehicle become an acceptable solution for the future of...

The larger insulating material thicknesses, the demands on the aesthetics of a flat roof structure and larger spans have led to the development of the fully insulated, prefabricated Multibox element as a flat roof. Due to the arrangement of the load-bearing wooden elements between the vapor barrier and the roof skin without a rear ventilation level, the construction is not unproblematic from a building physics point of view. In addition, the number of cases of damage to such constructions has...