This book traces the development of Kepler's ideas along with his unsteady wanderings in a world dominated by religious turmoil. Johannes Kepler, like Galileo, was a supporter of the Copernican heliocentric world model. From an early stage, his principal objective was to discover "the world behind the world", i.e. to identify the underlying order and the secrets that make the world function as it does: the hidden world harmony. Kepler was driven both by his religious belief and Greek mysticism, which he found in ancient mathematics. His urge to find a construct encompassing the harmony of every possible aspect of the world - including astronomy, geometry and music - is seen as a manifestation of a deep human desire to bring order to the apparent chaos surrounding our existence. This desire continues to this day as we search for a theory that will finally unify and harmonise the forces of nature.

Wireless communications have become indispensable part of our lives. The book deals with the security of such wireless communication. The technological background of these applications have been presented in detail. Special emphasis has been laid on the IEEE 802.11x-standards that have been developed for this technology. A major part of the book is devoted to security risks, encryption and authentication. Checklists have been provided to help IT administrators and security officers to achieve the maximum possible security in their installations, when using wireless technology. This is the second edition of the book. The updates include the latest the IEEE 802.11-standard, an updated chapter on PDA, the increased relevance of smart phones and tablets, widespread use of WLAN with increased security risks.

This textbook introduces energy utilisation. It outlines energy balances - which are determined by the fundamental laws of thermodynamics-, the fundamentals of atomic and nuclear mechanisms, the laws of fluid mechanics and electromagnetism. The technologies which stem from these mechanisms, including steam power plants, solar and wind energy systems, hydrodynamic power, biomass and geothermal energy systems, are all discussed. Prospects for future projects, such as nuclear fusion, fuel cells, and smart energy concepts are presented, as well as the role of energy balances in relation to climate engineering. Opportunities and Limits of Energy Utilisation will be of interest to graduate students, as well as researchers, lecturers, industry engineers. It provides numerous examples, problems and solutions, making it particularly relevant to students looking for a thorough understanding of the fundamentals of advanced energy technologies.

Seit Beginn dessen, was man Philosophie nennt – also dem Zeitalter der Vorsokratiker – haben große Geister sich bemüht, den Dualismus Geist-Materie zu überwinden und Erkenntnis auf eine einzige, eindeutige Quelle zurück zu führen – dem Ding-an-sich. Diese Entwicklung wird in diesem Buch nachverfolgt – bis hin zu den modernen Instrumenten der Datenhaltung und der künstlichen Intelligenz. Im Internet of Things schließlich werden Informationen und Objekte wieder zu einer einzigen Entität verschmolzen. Liegt da vielleicht die Lösung nach der Suche des Ding-an-sich?

This textbook introduces energy utilisation. It outlines energy balances - which are determined by the fundamental laws of thermodynamics-, the fundamentals of atomic and nuclear mechanisms, the laws of fluid mechanics and electromagnetism. The technologies which stem from these mechanisms, including steam power plants, solar and wind energy systems, hydrodynamic power, biomass and geothermal energy systems, are all discussed. Prospects for future projects, such as nuclear fusion, fuel cells, and smart energy concepts are presented, as well as the role of energy balances in relation to climate engineering. Opportunities and Limits of Energy Utilisation will be of interest to graduate students, as well as researchers, lecturers, industry engineers. It provides numerous examples, problems and solutions, making it particularly relevant to students looking for a thorough understanding of the fundamentals of advanced energy technologies.

This book traces the development of Kepler's ideas along with his unsteady wanderings in a world dominated by religious turmoil. Johannes Kepler, like Galileo, was a supporter of the Copernican heliocentric world model. From an early stage, his principal objective was to discover "the world behind the world", i.e. to identify the underlying order and the secrets that make the world function as it does: the hidden world harmony. Kepler was driven both by his religious belief and Greek mysticism, which he found in ancient mathematics. His urge to find a construct encompassing the harmony of every possible aspect of the world - including astronomy, geometry and music - is seen as a manifestation of a deep human desire to bring order to the apparent chaos surrounding our existence. This desire continues to this day as we search for a theory that will finally unify and harmonise the forces of nature.

Wireless communications have become indispensable part of our lives. The book deals with the security of such wireless communication. The technological background of these applications have been presented in detail. Special emphasis has been laid on the IEEE 802.11x-standards that have been developed for this technology. A major part of the book is devoted to security risks, encryption and authentication. Checklists have been provided to help IT administrators and security officers to achieve the maximum possible security in their installations, when using wireless technology. This is the second edition of the book. The updates include the latest the IEEE 802.11-standard, an updated chapter on PDA, the increased relevance of smart phones and tablets, widespread use of WLAN with increased security risks.