As the outbreak of World War II approached, Nazi Germany ordered artillery manufacturers Krupp and Rheimetall-Borsig to build several super-heavy siege guns, vital to smash through French and Belgian fortresses that stood in the way of the Blitzkrieg. These 'secret weapons' were much larger than the siege artillery of World War I and included the largest artillery piece of the war, the massive 80cm railway gun 'schwere Gustav' (Heavy Gustav). However, these complex and massive artillery pieces required years to build and test and, as war drew near, the German High Command hastily brought several WWI-era heavy artillery pieces back into service and then purchased, and later confiscated, a large number of Czech Skoda mortars. The new super siege guns began entering service in time for the invasion of Russia, notably participating in the attack on the fortress of Brest-Litovsk. The highpoint for the siege artillery was the siege of Sevastopol in the summer of 1942, which saw the largest concentration of siege guns in the war. Afterwards, when Germany was on the defensive in the second half of 1943, the utility of the guns was greatly diminished, and they were employed in a piecemeal and sporadic fashion on both the Eastern and Western Fronts. In total, the German Army used some 50 siege guns during World War II, far more than the thirty-five it had during World War I. Supported by contemporary photographs and detailed artwork of the guns and their components, this is an essential guide to these guns, exploring their history, development, and deployment in stunning detail.
The failure of the Maginot Line shocked the world and lead to the sudden collapse of organized French resistance against Germany. Constructed throughout the 1930s, the Maginot Line was supposed to form the ultimate defence against a German invasion of France. However, different sections of the line were built at different times and the strength of various sections varied widely. During their Blitzkrieg invasion, the Germans were able to identify these weak points and focus their attacks against them. This book uses maps and period photographs to tell the story of the five German operations launched against the Maginot Line. While the Germans were able to smash through the lightly defended section of the line along the Meuse River, at other points the line held. Although ultimately the Maginot Line was to prove a failure, the stiff resistance put up by some of the fortresses confirms the fighting ability of the French army during the invasion.
In the early days of World War I, Germany unveiled a new weapon – the mobile 42cm (16.5 inch) M-Gerät howitzer. At the time, it was the largest artillery piece of its kind in the world and a closely guarded secret. When war broke out, two of the howitzers were rushed directly from the factory to Liege where they quickly destroyed two forts and compelled the fortress to surrender. After repeat performances at Namur, Maubeuge and Antwerp, German soldiers christened the howitzers 'Grosse' or 'Dicke Berta' (Fat or Big Bertha) after Bertha von Krupp, owner of the Krupp armament works that built the howitzers. The nickname was soon picked up by German press which triumphed the 42cm howitzers as Wunderwaffe (wonder weapons), and the legend of Big Bertha was born. This book details the design and development of German siege guns before and during World War I. Accompanying the text are many rare, never-before-published photographs of 'Big Bertha' and the other German siege guns. Colour illustrations depict the most important aspects of the German siege artillery.
This book explains how the performance of modern cellular wireless networks can be evaluated by measurements and simulations With the roll-out of LTE, high data throughput is promised to be available to cellular users. In case you have ever wondered how high this throughput really is, this book is the right read for you: At first, it presents results from experimental research and simulations of the physical layer of HSDPA, WiMAX, and LTE. Next, it explains in detail how measurements on such systems need to be performed in order to achieve reproducible and repeatable results. The book further addresses how wireless links can be evaluated by means of standard-compliant link-level simulation. The major challenge in this context is their complexity when investigating complete wireless cellular networks. Consequently, it is shown how system-level simulators with a higher abstraction level can be designed such that their results still match link-level simulations. Exemplarily, the book finally presents optimizations of wireless systems over several cells. This book: Explains how the performance of modern cellular wireless networks can be evaluated by measurements and simulations Discusses the concept of testbeds, highlighting the challenges and expectations when building them Explains measurement techniques, including the evaluation of the measurement quality by statistical inference techniques Presents throughput results for HSDPA, WiMAX, and LTE Demonstrates simulators at both, link- level and system-level Provides system-level and link-level simulators (for WiMAX and LTE) on an accompanying website (https://www.nt.tuwien.ac.at/downloads/featured-downloads) This book is an insightful guide for researchers and engineers working in the field of mobile radio communication as well as network planning. Advanced students studying related courses will also find the book interesting.
This book introduces the Vienna Simulator Suite for 3rd-Generation Partnership Project (3GPP)-compatible Long Term Evolution-Advanced (LTE-A) simulators and presents applications to demonstrate their uses for describing, designing, and optimizing wireless cellular LTE-A networks. Part One addresses LTE and LTE-A link level techniques. As there has been high demand for the downlink (DL) simulator, it constitutes the central focus of the majority of the chapters. This part of the book reports on relevant highlights, including single-user (SU), multi-user (MU) and single-input-single-output (SISO) as well as multiple-input-multiple-output (MIMO) transmissions. Furthermore, it summarizes the optimal pilot pattern for high-speed communications as well as different synchronization issues. One chapter is devoted to experiments that show how the link level simulator can provide input to a testbed. This section also uses measurements to present and validate fundamental results on orthogonal frequency division multiplexing (OFDM) transmissions that are not limited to LTE-A. One chapter exclusively deals with the newest tool, the uplink (UL) link level simulator, and presents cutting-edge results. In turn, Part Two focuses on system-level simulations. From early on, system-level simulations have been in high demand, as people are naturally seeking answers when scenarios with numerous base stations and hundreds of users are investigated. This part not only explains how mathematical abstraction can be employed to speed up simulations by several hundred times without sacrificing precision, but also illustrates new theories on how to abstract large urban heterogeneous networks with indoor small cells. It also reports on advanced applications such as train and car transmissions to demonstrate the tools’ capabilities.
Historians, sports scholars, and students will refer to Benching Jim Crow for many years to come as the standard source on the integration of intercollegiate sport."ùMark S. Dyreson, author of Making the American Team: Sport, Culture, and the Olympic Experience --
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