Five Photons

Author: James Geach
Publisher: Reaktion Books
ISBN: 1789140218
Category : Science
Languages : en
Pages : 185

Book Description
Have you ever wondered what is the most distant source of light we can see, or how a star shines? Did you know that black holes can blaze like cosmic beacons across intergalactic space, and that ancient radio waves might herald the ignition of the very first stars? Have you ever thought about what light really is? Five Photons explains what we know about the universe through five different journeys of light across space and time. They are tales of quantum physics and general relativity, stars and black holes, dark matter and dark energy. Let yourself be swept away on a journey of discovery towards a deeper understanding of the cosmos.

The Second Substance

Author: Slobodan Andrejevic
Publisher: AuthorHouse
ISBN: 1496935411
Category : Science
Languages : en
Pages : 319

Book Description
Contemporary physics is not able to determine the true content of the universe. At the present time we do not have clear scientific answers to what are the universe, particle, mass, energy, gravity, infinity, space and many more components of the universe. They are left unanswered and opened for everybody to guess. We are given descriptive definitions based on study of particle motions so we have a glimpse of what the universe does but not even a rudimentary concept of what the universe is. This scientific insecurity gives various ideologists open field to preach their doctrines about what is the universe and what are humans in it. My background is in philosophy and physics and I spent most of my life in researching the universe content and properties. I found the real, logical answers, which as it happened do not comply with what physics at the present time calls The Standard Model of the Universe. Most of hypothetical work accomplished in this field became somehow an ideology of the modern science and a dogma of a sort. Society passionately protects its dogmas as it did in Galileos time so my theory will provoke resistance among some contemporary physicists and ideologists because it is not based on quantum mechanics mathematics and principle of uncertainty. Subject of quantum mechanics is universe behaviour motions quantities. It only recognizes what the universe does and it cannot even express what universe is. For the real answers I turned to logic and by a painstaking logical process of simplification, comparison and elimination I came to conclusions which are rather surprising, original and are supported by all true laws of physics and correctly interpreted experiments. I replaced quantum mechanics with natural logic in the new model of the universe. None of this has ever been published.

Monte Carlo Techniques in Radiation Therapy

Author: Frank Verhaegen
Publisher: CRC Press
ISBN: 1000455556
Category : Medical
Languages : en
Pages : 291

Book Description
About ten years after the first edition comes this second edition of Monte Carlo Techniques in Radiation Therapy: Introduction, Source Modelling, and Patient Dose Calculations, thoroughly updated and extended with the latest topics, edited by Frank Verhaegen and Joao Seco. This book aims to provide a brief introduction to the history and basics of Monte Carlo simulation, but again has a strong focus on applications in radiotherapy. Since the first edition, Monte Carlo simulation has found many new applications, which are included in detail. The applications sections in this book cover the following: Modelling transport of photons, electrons, protons, and ions Modelling radiation sources for external beam radiotherapy Modelling radiation sources for brachytherapy Design of radiation sources Modelling dynamic beam delivery Patient dose calculations in external beam radiotherapy Patient dose calculations in brachytherapy Use of artificial intelligence in Monte Carlo simulations This book is intended for both students and professionals, both novice and experienced, in medical radiotherapy physics. It combines overviews of development, methods, and references to facilitate Monte Carlo studies.

Monte Carlo Techniques in Radiation Therapy

Author: Joao Seco
Publisher: Taylor & Francis
ISBN: 1466507942
Category : Mathematics
Languages : en
Pages : 334

Book Description
Modern cancer treatment relies on Monte Carlo simulations to help radiotherapists and clinical physicists better understand and compute radiation dose from imaging devices as well as exploit four-dimensional imaging data. With Monte Carlo-based treatment planning tools now available from commercial vendors, a complete transition to Monte Carlo-base

Molecular Dynamics and Spectroscopy by Stimulated Emission Pumping

Author: Hai-Lung Dai
Publisher: World Scientific
ISBN: 9789810221119
Category : Science
Languages : en
Pages : 1148

Book Description
Since the first stimulated emission pumping (SEP) experiments more than a decade ago, this technique has proven powerful for studying vibrationally excited molecules. SEP is now widely used by increasing numbers of research groups to investigate fundamental problems in spectroscopy, intramolecular dynamics, intermolecular interactions, and even reactions. SEP provides rotationally pre-selected spectra of vibrationally highly excited molecules undergoing large amplitude motions. A unique feature of SEP is the ability to access systematically a wide variety of extreme excitations localized in various parts of a molecule, and to prepare populations in specific, high vibrational levels. SEP has made it possible to ask and answer specific questions about intramolecular vibrational redistribution and the role of vibrational excitation in chemical reactions.

Observability and Observation in Physical Science

Author: Peter Kosso
Publisher: Springer Science & Business Media
ISBN: 9400924348
Category : Science
Languages : en
Pages : 173

Book Description
The concept of observability of entities in physical science is typically analyzed in terms of the nature and significance of a dichotomy between observables and unobservables. In this book, however, this categorization is resisted and observability is analyzed in a descriptive way in terms of the information which one can receive through interaction with objects in the world. The account of interaction and the transfer of information is done using applicable scientific theories. In this way the question of observability of scientific entities is put to science itself. Several examples are presented which show how this interaction-information account of observability is done. It is demonstrated that observability has many dimensions which are in general orthogonal. The epistemic significance of these dimensions is explained. This study is intended primarily as a method for understanding problems of observability rather than as a solution to those problems. The important issue of scientific realism and its relation to observability, however, demands attention. Hence, the implication of the interaction-information account for realism is drawn in terms of the epistemic significance of the dimensions of observability. This amounts to specifying what it is about good observations that make them objective evidence for scientific theories.

Vortex Atom, The: A New Paradigm

Author: Barry R Clarke
Publisher: World Scientific
ISBN: 9811227608
Category : Science
Languages : en
Pages : 302

Book Description
With clear illustrations throughout and without recourse to quantum mechanics, the reader is invited to revisit unsolved problems lying at the foundations of theoretical physics. Maxwell and his contemporaries abandoned their search for a geometrical representation of the electric and magnetic fields. The wave-particle dilemma and Bose-Einstein statistical counting have resulted in unsatisfactory non-realistic interpretations. Furthermore, a simple structure of the hydrogen atom that includes hyperfine levels is still wanting.Working with the latest experimental data in photonics a proposed solution to the wave-particle dilemma is suggested based on an array of circular-polarized rays. The Bose-Einstein counting procedure is recast in terms of distinguishable elements. Finally, a vortex model of a 'particle' is developed based on a trapped photon. This consists of a single ray revolving around a toroidal surface, and allows a geometrical definition of mass, electric potential, and magnetic momentum. With the adjustment of two parameters, values to 4 dp for the hyperfine frequencies (MHz) of hydrogen can be obtained for which a computer program is available.

Reminiscences: A Journey Through Particle Physics

Author: Adrian C Melissinos
Publisher: World Scientific
ISBN: 9814405027
Category : Science
Languages : en
Pages : 221

Book Description
A personal recount in areas of particle physics and related fields as a research physicist for over 50 years, Adrian Melissinos' insights into the ways that general research was carried out, as well as the evolution of particle physics from 1958 to 2008 will prove valuable to science history enthusiasts, as well as particle physicists.Be it conventional accelerator experiments, the use of microwave techniques in search of cosmic axions, or taking advantage of high power lasers to observe light-by-light scattering, the excitement of searching for something new in the face of failures and then successes is enriching, and the collaboration with gifted and outstanding colleagues and students proves insightful.A hybrid of personal reminiscences and a professional journey, readers get to relive the joy and excitement of researching and teaching in small groups during those early years while gaining a partial historical perspective of particle physics since 1958 — all in Reminiscences: A Journey through Particle Physics./a /remove

Proceedings of the 23rd Pacific Basin Nuclear Conference, Volume 3

Author: Chengmin Liu
Publisher: Springer Nature
ISBN: 9811988994
Category : Science
Languages : en
Pages : 1260

Book Description
This is the third in a series of three volumes of proceedings of the 23rd Pacific Basin Nuclear Conference (PBNC 2022) which was held by Chinese Nuclear Society. As one in the most important and influential conference series of nuclear science and technology, the 23rd PBNC was held in Beijing and Chengdu, China in 2022 with the theme “Nuclear Innovation for Zero-carbon Future”. For taking solid steps toward the goals of achieving peak carbon emissions and carbon neutrality, future-oriented nuclear energy should be developed in an innovative way for meeting global energy demands and coordinating the deployment mechanism. It brought together outstanding nuclear scientists and technical experts, senior industry executives, senior government officials and international energy organization leaders from all across the world. The proceedings highlight the latest scientific, technological and industrial advances in Nuclear Safety and Security, Operations and Maintenance, New Builds, Waste Management, Spent Fuel, Decommissioning, Supply Capability and Quality Management, Fuel Cycles, Digital Reactor and New Technology, Innovative Reactors and New Applications, Irradiation Effects, Public Acceptance and Education, Economics, Medical and Biological Applications, and also the student program that intends to raise students’ awareness in fully engaging in this career and keep them updated on the current situation and future trends. These proceedings are not only a good summary of the new developments nuclear science and technology, but also a useful guideline for the researchers, engineers and graduate students.

Monte Carlo Methods for Radiation Transport

Author: Oleg N. Vassiliev
Publisher: Springer
ISBN: 3319441418
Category : Science
Languages : en
Pages : 292

Book Description
This book is a guide to the use of Monte Carlo techniques in radiation transport. This topic is of great interest for medical physicists. Praised as a "gold standard" for accurate radiotherapy dose calculations, Monte Carlo has stimulated a high level of research activity that has produced thousands of papers within the past few years. The book is designed primarily to address the needs of an academically inclined medical physicist who wishes to learn the technique, as well as experienced users of standard Monte Carlo codes who wish to gain insight into the underlying mathematics of Monte Carlo algorithms. The book focuses on the fundamentals—giving full attention to and explaining the very basic concepts. It also includes advanced topics and covers recent advances such as transport of charged particles in magnetic fields and the grid-based solvers of the Boltzmann equation.