Ingenieurwissenschaften

Die Rad Schiene Kontaktflächen werden mittels der Finite-Elemente-Methode mit anschließender experimenteller Validierung der numerischen Ergebnisse ermittelt. Zur Abbildung der Kontaktsituation wurden Materialmodelle für drei Druckmessfolientypen sowie für Kohlepapier in Kombination mit herkömmlichem Papier bestimmt. Die experimentellen Validierungen belegen, dass die erarbeiteten Materialmodelle valide Ergebnisse für die Vorhersage der Rad-Schiene-Kontaktsituation liefern.

Strukturgussbauteile aus Aluminium nehmen in Zeiten der Elektromobilität und immer weiter steigender Fahrzeuggewichte einen hohen Stellenwert in der Automobilindustrie ein. Besonders hochfeste Legierungen bieten dabei die Möglichkeit, Wandstärke zu reduzieren, den Leichtbau voranzutreiben und wertvolle Ressourcen zu schonen. Diese weisen dabei allerdings zumeist einen spröden Charakter auf, wodurch ihr Einsatzspektrum stark begrenzt ist.Das Ziel dieses Buches ist es, die Verformbarkeit hochfester Aluminium-Silizium-Druckgusslegierungen zu verbessern, ohne sonstige Eigenschaften negativ zu beeinträchtigen. Hierzu wird ein umfassendes Grundverständnis zur Reduktion intermetallischer Phasen geschaffen, sowie die Rolle unterschiedlichster Legierungselemente bei der Entstehung von Formkleben und ihr Einfluss auf Gießbarkeit, Festigkeit und Duktilität analysiert.Auf Basis der erarbeiteten Erkenntnisse wird eine optimierte Strukturgusslegierung vorgestellt, welche bis zu 40 % höhere Bruchdehnungen erreicht und ein Vordringen in bisher unerreichte Festigkeiten eröffnet.

This book offers an in-depth exploration of battery separators, a critical component in Lithium-ion batteries (LIBs). Serving as insulators between electrodes to prevent internal short circuits, these separators play a crucial role in retaining liquid electrolyte and facilitating the migration of lithium ions during battery cycling. In the face of increasing demand for high-performance LIBs across diverse applications, the development of superior separators is imperative. Among the various advancements in battery separator research, electrospun nanofibrous separators have gained significant attention. These separators exhibit compelling characteristics, including large pore size (typically above 500 nm), high porosity (typically above 70%), and an interconnected porous structure, all of which enhance ion transportation efficiency and battery cycling performance. However, a notable focus in previous studies has been on electrochemical inert materials as battery separators, which do not contribute to the battery's capacity. This book presents a comprehensive study that introduces a novel concept: the development of a redox-active separator based on electrospun polypyrrole (PPy) composite nanofibers to significantly enhance battery capacity. The book begins by exploring the effects of separators on battery performance, providing valuable insights and guidance for separator design. Then, a detailed investigation into the kinetics of in-situ polymerization of PPy with electrospun fibrous membranes as templates follows, shedding light on the mechanisms behind fabricating the proposed separator. Finally, this book presents the fabrication and characterization of the proposed separator, showcasing potential of the separator for enhancing battery capacity. This book is intended for researchers, engineers, and professionals in the field of battery technology, materials science, and electrochemistry. It is also a valuable resource for graduate students and academics seeking advanced insights into the development of high-performance lithium-ion batteries and innovative separator technologies.

This contributed book is focused on the use of nanomaterials in biomedical applications, particularly in the development of pharmaceuticals, nutraceuticals, and cosmeceuticals. It covers a wide range of nanomaterials, including polymers, metals, and carbon-based materials, and discusses their incorporation into polymeric biocomposites to create materials with unique properties. The book overviews the various applications of these nanocomposites, including tissue engineering, drug delivery, biosensors, and packaging. It is a useful resource for research scholars, graduate students, academics, and pharmaceutical companies working in the fields of material science and nanotechnology.

This book provides readers with peer-reviewed research papers presented at the 6th International Conference on Clean Energy and Electrical Systems held in Kyoto, Japan, from April 5 to 7, 2024. This proceedings mainly covers theoretical, technical, and practical methods and practices on clean energy and electrical systems. And it includes nuclear energy and "renewable energy." With the continuous growth of energy demand and the increasing awareness of environmental protection in countries around the world, it is urgent and imperative to establish a clean energy innovation research and development, promotion, and application system. The book also covers electricity, fuel, thermal, transportation, and water infrastructures and their development and deployment in different regions around the world. The book includes future development trends with analysis of lifecycle and economical models for successful implementation projects.

This thesis demonstrates the value of theoretical approaches in the discovery of new superconducting materials. It reports a detailed study of the recently discovered nickel-oxide (nickelate) superconductors using multiple first-principles computational tools, from density functional theory to dynamical mean field theory. In the context of superconductivity, discoveries have generally been linked to serendipitous experimental discovery; this thesis reports some of the few examples of predictions of new superconductors that have later been realized in practice, a prime example of the significance of the methodology it expounds. Overall, it represents a seminal systematic work in the electronic structure theory of the emergent field of nickelate superconductivity.

This book mainly investigates the adsorption of anionic diclofenac sodium on natural clay minerals, the adsorption of anionic chloramphenicol on natural clay minerals and the behavior of surface and interface modification or adsorption on clay minerals. It has significant guidance for learning the transfer and fate of pharmaceuticals and personal care products (PPCPs) in the soil. It develops an efficient, low-cost adsorbent material and provides theoretical basis and valuable reference for the effective prevention of groundwater contamination of PPCPs in the field of environmental engineering.

This volume comprises the select proceedings of the 3rd Biennial International Conference on Future Learning Aspects of Mechanical Engineering (FLAME) 2022. It aims to provide a comprehensive and broad-spectrum picture of the state-of-the-art research and development in engineering design. Various topics covered include engineering system, synthesis of mechanism, failure analysis, solid and structural mechanics, contact mechanics, multi-body dynamics, fracture mechanics, vibration and acoustics, etc. This volume will prove a valuable resource for researchers and professionals in the area of mechanical engineering, especially engineering design and allied fields.

This book covers preparation methods, characterization, and applications of most glass families. It reports the fundamentals of glass, challenges in the development, traditional and new manufacturing processes, characterization techniques, structural, thermal, and optical properties. The book reviews redox reactions in glasses and the factors affecting them, in addition to the techniques for determining the redox states and speciation of polyvalent ions in glass. A special chapter is dedicate to phosphate glasses, their importance, preparation methods, structure and properties. The use of different types of phosphate glasses in biomedicine, optics, electrochemistry, and as hosts for nuclear wastes is thoroughly discussed. Moreover, the applications of phosphate glasses in electronics and laser technology are also discussed in this book. Recent experimental studies such as the development of a novel bioglass system and the influence of ZnO,TiO2, and Al2O3 incorporation on structural, mechanical strength, degradation, pH variation, and formation of hydroxyapatite (Hap) layer on the glass surface are reported. Promising aluminum-silicate glassy system and its glass-ceramic counterpart are also presented in this books. An overview of the calorimetry approaches related to rare earth improvements on the thermal stability of glass is provided. The book discusses the advances in the chalcogenide glasses (ChGs) and based devices. It also reports their applications in optical devices, semiconductor circuits, and other applications. In addition, lanthanide and/or QDs doped luminescent glasses and their use in solid-state lighting and displays, security (anti-counterfeiting), optical temperature sensors, and solar energy (solar spectrum conversion) are reviewed along with a comparison of their advantages and disadvantages. Finally, the nature of phthalocyanines as materials for glass coatings and most widely used synthesis methods of porphyrins and phthalocyanines are discussed.