Physics and Astronomy (R0)

This book contains contributions presented at the 13th International Conference on Complex Networks (CompleNet), April 19–22, 2022. CompleNet is an international conference on complex networks that brings together researchers and practitioners from diverse disciplines—from sociology, biology, physics, and computer science—who share a passion to better understand the interdependencies within and across systems.  CompleNet is a venue to discuss ideas and findings about all types of networks, from biological to technological and to informational and social. It is this interdisciplinary nature of complex networks that CompleNet aims to explore and celebrate.

This book presents fused deposition modeling (FDM) which is an additive manufacturing (AM) process to fabricate 3D parts from a build-up of 2D layers. The chapters present an experimental analysis of fatigue characteristics of FDM-processed PLA samples. The results indicate that the concentric build orientation provides highest cycles of fatigue, ultimate strength, and impact energy. The effect of layer orientation on the fatigue behavior of 3D-printed PLA samples is investigated in this case study.

This thesis makes significant advances in the use of microspheres in optical traps as highly precise sensing platforms. While optically trapped microspheres have recently proven their dominance in aqueous and vacuum environments, achieving state-of-the-art measurements of miniscule forces and torques, their sensitivity to perturbations in air has remained relatively unexplored. This thesis shows that, by uniquely operating in air and measuring its thermally-fluctuating instantaneous velocity, an optically trapped microsphere is an ultra-sensitive probe of both mass and sound. The mass of the microsphere is determined with similar accuracy to competitive methods but in a fraction of the measurement time and all while maintaining thermal equilibrium, unlike alternative methods. As an acoustic transducer, the air-based microsphere is uniquely sensitive to the velocity of sound, as opposed to the pressure measured by a traditional microphone. By comparison to state-of-the-art commercially-available velocity and pressure sensors, including the world’s smallest measurement microphone, the microsphere sensing modality is shown to be both accurate and to have superior sensitivity at high frequencies. Applications for such high-frequency acoustic sensing include dosage monitoring in proton therapy for cancer and event discrimination in bubble chamber searches for dark matter. In addition to reporting these scientific results, the thesis is pedagogically organized to present the relevant history, theory, and technology in a straightforward way.

The concept of Hybrid Warfare has gained prominence in recent decades. It is a novel terminology, but the concept is detectable since antiquity: Ancient Chinese, Ancient Greeks and the Jews of Exodus were all well familiar, so well to have let us know. Similarly, bioagents have been used malevolently since always. What is novel is that these two, in the present context, are not only interfacing smoothly, but in an enhanced context: The Hybrid Warfare, which has now enriched its portfolio, from actions of provocation, insurgency, economic warfare, special operations, proxy warfare and social destabilization to the Residual domain, the cyberspace, while the conventional, 3D space expands. Now the Space and the Deep are included in the topography of the friction zone.

In this, the bio- factor becomes not only relevant but also an amplifier: using the technology malevolently, all the advances made to combat disease may be used to cause, further, or perplex and complicate disease. Improved or totally novel or even alien germs may replace explosives in bombs, shells or suicidal /kamimaze drones and taint bullets and fragments. Microrobots may deliver cancer cells to targeted individuals to foster cancer, or specific supergerms for an infection to rage unchallenged. And what happens if the mechanism of these cancers and infections is intentionally provided with an Abort signal? Global extortions would become probable, not just possible.

Far from Science Fiction, this dystopia becomes more probable by the day. The Artificial Intelligence simply makes it easier to occur. Technology allows manipulation and intervention in levels and extends only imagined in the Past, but the application of these capabilities is clearly of dual use, with the destructive potential leveraged by the complexity of the social and state structure. Within this book, we explore the “How” (occasionally the “What” also) in some of these instances. From cyber terrorists to aggressive bioindustrialists and “democratized” ballistic and cruise missile technology, it could be coined as "The Book of Modern Mayhem”.

This textbook offers an introduction to statistical mechanics, special relativity, and quantum physics, developed from lecture notes for the "Quantum Physics" course at the University of Padua. Beginning with a brief review of classical statistical mechanics in the first chapter, the book explores special and general relativity in the second chapter. The third chapter delves into the historical analysis of light quantization, while the fourth chapter discusses Niels Bohr's quantization of energy levels and electromagnetic transitions. The Schrödinger equation is investigated in the fifth chapter. Chapter Six covers applications of quantum mechanics, including the quantum particle in a box, quantum particle in harmonic potential, quantum tunneling, stationary perturbation theory, and time-dependent perturbation theory. Chapter Seven outlines the basic axioms of quantum mechanics. Chapter Eight focuses on quantum atomic physics, emphasizing electron spin and utilizing the Dirac equation for theoretical justification. The ninth chapter explains quantum mechanics principles for identical particles at zero temperature, while Chapter Ten extends the discussion to quantum particles at finite temperature. Chapter Eleven provides insights into quantum information and entanglement, and the twelfth chapter explains the path integral approach to quantum mechanics.

This book provides engineers with a comprehensive understanding of nuclear reactor physics and neutronics, emphasizing the importance of simple models to validate complex computational results. It explains the rationale behind neutron slowing down and offers a straightforward method to evaluate the resonance escape probability in Fermi's 4-factors formula. The book includes exercises to assess the remaining three factors and demonstrates how to derive the diffusion approximation from the Boltzmann equation. It covers both one-group and two-group diffusion models, applying them to predict the reactivity of a nuclear reactor core. Special attention is given to the selection of the migration area. Additionally, the book addresses delayed neutrons, reactor kinetics, fission product poisoning, fuel evolution, fuel management, critical size, temperature effects, and xenon oscillations. Originally written for students, it contains 28 exercises with solutions provided in the appendix, making it an invaluable resource for both learning and practical application in the field.

Ball lightning is an enigma. These luminous objects that appear occasionally during thunderstorms and can reach several meters in diameter have been a mystery to science for about 200 years. Despite several thousands of reported observations, their nature is still unknown. In this book, well documented cases of ball lightning are described and used to unravel some aspects of this mysterious form of atmospheric electricity. Throughout the book, the author discusses the various facets of the problem in an accessible but rigorous style, delivering a readable and informative text that will captivate the curious reader. Now in an updated and expanded second edition, the author reports on groundbreaking new data on conditions under which ball lightning may form and its implications. These new discoveries are elucidated with new figures, additional case descriptions, new material on the interaction of ball lightning with humans, and a discussion of the reliability of ball lightning observations. This book presents the most up-to-date summary of the state of knowledge surrounding ball lightning.

A foreword by Earle Williams, leading lightning researcher at MIT, introduces the book.

The book is the result of some years of teaching a course in Physics Modeling in Economics and Finance to M.Sc. students of Physics/Astrophysics and Eng. Physics. It is devoted to show economics and finance as a part of a physics system by its own right and, with that, to provide students with the basic tools to face a career in finance or in research developing physics models to a very unusual system that we call “an economy,” but made of interactions, geometry, equilibrium, and inflation. It goes from understanding the fundamental of basic mathematics to explaining complex systems where it stops working; from the physics’ meaning of money to derivative valuation; and from statistical physics to the physics of inflationary systems.

This open access book is a compilation of enlightening tutorial essays, showcasing the forefront of research by exceptional female scientists. This invaluable collection provides graduate students and researchers in the field with an engaging and pedagogical introduction to a wide range of compelling topics. Delve into the depths of theoretical and observational realms, exploring intriguing subjects including modified gravity models, quantum gravity, fields in curved space-time, particle dynamics, gravitational waves, and enigmatic black holes.
Embracing both the theoretical foundations and the practical applications, this comprehensive edited volume offers an accessible and all-encompassing panorama of gravity and cosmology. Moreover, it shines a much-needed spotlight on the significant contributions made by remarkable women across the globe, fostering recognition and admiration for their indispensable role in shaping this ever-evolving field.