Physics - DocsBay

A Technical Overview of Oracle Supercluster

Oracle SuperCluster is Oracle’s fastest, most secure, and most scalable engineered system. It is a complete engineered system for optimally running databases and applications on a single integrated system. Oracle SuperCluster is ideal for massive consolidation and private clouds. It is designed, tested, and integrated to run business-critical enterprise ...

Understanding Magnetic Resonance Imaging

The physics of magnetic resonance imaging MRI relies on the fact that some atoms within the human body possess an odd unpaired proton. The proton nucleus of the hydrogen atom is one of the most abundant examples, being a major constituent of water. It responds particularly well to the application of an external magnetic field and is therefore one of the ...

Laser Reference Guide

The Principle Investigator (PI) or designee shall train staff on the hazards of the specific experimental work to be performed. It is critical for the PI to determine the current level of staff competency for those requiring training in order to tailor the training to their needs. Training will include: 1. Locating and mitigating potentially hazardous be ...

Basic Accelerator Physics

The guiding and focusing of a charged particle beam in a circular accelerator rely on a series of magnetic elements, separated by field-free drift spaces, that form the accelerator lattice. The design of the lattice is one of the first tasks for the accelerator designer. One normally starts with a simplified structure, containing only ideal magnetic dipo ...

Quantum Gravity : Motivations and Alternatives

The mutual conceptual incompatibility between General Relativity and Quantum Mechanics / Quantum Field Theory is generally seen as the most essential motivation for the development of a theory of Quantum Gravity. It leads to the insight that, if gravity is a fundamental interaction and Quantum Mechanics is universally valid, the gravitational field will ...

An Review on Loop Quantum Gravity

I would like to thanks in first place my tutor, Prof. Lionel Mason, for his readiness in helping me with any doubts I have had during the dissertation, and for offering himself to tutor it before even the course started. He is a great tutor. I would also like to thank all my friends in Oxford, in special Irina, Mateo, Siyu, Ziyan, Suvajit and Hemani for ...

Cosmology Useful Numbers for Reference

Perhaps the most obvious cosmological observation that we can make is to look at the sky at night. Why is most of the sky dark rather than light? This is called Olbers’ paradox. This single observation tells us something important about the universe: it cannot be infinite and static, with any constant density of stars, otherwise in every direction we loo ...

The Big-Bang Theory: Construction, Evolution and Status

Over the past century, rooted in the theory of general relativity, cosmology has developed a very successful physical model of the universe: the big-bang model. Its construction followed di↵erent stages to incorporate nuclear processes, the understanding of the matter present in the universe, a description of the early universe and of the large scale str ...

A Concise Introduction to Astrophysics

• Astronomy is with mathematics one of the oldest branches of science. It has served as basis for calendars, navigation, has been an important input for religions and was for a long time intertwined with astrology. • Some of the most important steps in modern astronomy were: – Galileo performed 1609 the first astronomical studies using a telescope. He di ...

Black Hole Activities

Black holes are one of the most extraordinary objects in the Universe, they are extremely simple and yet incredibly exotic. A black hole does not have a surface, like a planet or star, instead, it is a region of space where matter has collapsed in on itself such that the pull of gravity is so strong that, once captured, nothing - not even light - is able ...

Superconductivity: the Meissner Effect, Persistent Currents and the Josephson Effects

It is imperative that you read this section on Cryogenic Safety before proceeding with the experiment. The Dewar flask shown in Figure 7 contains liquid helium in a nearly spherical metal container (34 cm in diameter) which is supported from the top by a long access or neck tube (length about 50-60 cm and diameter about 3 cm) of low conductivity metal. I ...

Quantum Electrodynamics on Background External Fields

The quantum electrodynamics in the presence of background external fields is developed. Modern methods of local quantum physics allow to formulate the theory on arbitrarily strong possibly time-dependent external fields. Non-linear observables which depend only locally on the external field are constructed. The tools necessary for this formulation, the p ...

Antimatter

The nature of antimatter is examined in the context of algebraic quantum field theory. It is shown that the notion of antimatter is more general than that of antiparticles. Properly speaking, then, antimatter is not matter made up of antiparticles — rather, antiparticles are particles made up of antimatter. We go on to discuss whether the notion of antim ...

Aristotelian Physics

No other philosopher had such a deep and long-standing impact on Western science as Aristotle. In the fourth century BC he developed a fully comprehensive worldview that would with only few modifications stand for about two thousand years. Rather than just collecting isolated facts, he posed fundamental questions about nature and about the methods to stu ...

Modeling the History of Astronomy: Ptolemy, Copernicus and Tycho

This paper describes a series of activities in which students investigate and use the Ptolemaic, Copernican, and Tychonic models of planetary motion. The activities guide students through using open source software to discover important observational facts, learn the necessary vocabulary, understand the fundamental properties of different theoretical mod ...

Elementary Particles in Physics

Elementary-particle physics deals with the fundamental constituents of matter and their interactions. In the past several decades an enormous amount of experimental information has been accumulated, and many patterns and systematic features have been observed. Highly successful mathematical theories of the electromagnetic, weak, and strong interactions h ...

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