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Books > Science & Mathematics > Physics > General
This thesis addresses one of the most fundamental challenges for modern science: how can the brain as a network of neurons process information, how can it create and store internal models of our world, and how can it infer conclusions from ambiguous data? The author addresses these questions with the rigorous language of mathematics and theoretical physics, an approach that requires a high degree of abstraction to transfer results of wet lab biology to formal models. The thesis starts with an in-depth description of the state-of-the-art in theoretical neuroscience, which it subsequently uses as a basis to develop several new and original ideas. Throughout the text, the author connects the form and function of neuronal networks. This is done in order to achieve functional performance of biological brains by transferring their form to synthetic electronics substrates, an approach referred to as neuromorphic computing. The obvious aspect that this transfer can never be perfect but necessarily leads to performance differences is substantiated and explored in detail. The author also introduces a novel interpretation of the firing activity of neurons. He proposes a probabilistic interpretation of this activity and shows by means of formal derivations that stochastic neurons can sample from internally stored probability distributions. This is corroborated by the author's recent findings, which confirm that biological features like the high conductance state of networks enable this mechanism. The author goes on to show that neural sampling can be implemented on synthetic neuromorphic circuits, paving the way for future applications in machine learning and cognitive computing, for example as energy-efficient implementations of deep learning networks. The thesis offers an essential resource for newcomers to the field and an inspiration for scientists working in theoretical neuroscience and the future of computing.
Optical spectroscopy has been instrumental in the discovery of many
lanthanide elements. In return, these elements have always played a
prominent role in lighting devices and light conversion
technologies (Auer mantles, incandescent lamps, lasers, cathode-ray
and plasma displays). They are also presently used in highly
sensitive luminescent bio-analyses and cell imaging. This volume of
the Handbook on the Physics and Chemistry of Rare Earths is
entirely devoted to the photophysical properties of these elements.
It is dedicated to the late Professor William T (Bill) Carnall who
has pioneered the understanding of lanthanide spectra in the 1960 s
and starts with a Dedication to this scientist. The following five
chapters describe various aspects of lanthanide spectroscopy and
its applications. Chapters 231 presents state-of-the-art
theoretical calculations of lanthanide energy levels and transition
intensities. It is followed by a review (Chapter 232) on both
theoretical and experimental aspects of f-d transitions, a less
well known field of lanthanide spectroscopy, yet very important for
the design of new optical materials. Chapter 233 describes how
confinement effects act on the photophysical properties of
lanthanides when they are inserted into nanomaterials, including
nanoparticles, nanosheets, nanowires, nanotubes, insulating and
semiconductor nanocrystals. The use of lanthanide chelates for
biomedical analyses is presented in Chapter 234; long lifetimes of
the excited states of lanthanide ions allow the use of
time-resolved spectroscopy, which leads to highly sensitive
analyses devoid of background effect from the autofluorescence of
the samples. The last review (Chapter 235) provides a comprehensive
survey of near-infrared (NIR) emitting molecular probes and
devices, spanning an all range of compounds, from simple chelates
to macrocyclic complexes, heterometallic functional edifices,
coordination polymers and other extended structures. Applications
ranging from telecommunications to light-emitting diodes and
biomedical analyses are assessed.
This thesis investigates the sound generated by solid bodies in steady subsonic flows with unsteady perturbations, as is typically used when determining the noise generated by turbulent interactions. The focus is predominantly on modelling the sound generated by blades within an aircraft engine, and the solutions are presented as asymptotic approximations. Key analytical techniques, such as the Wiener-Hopf method, and the matched asymptotic expansion method are clearly detailed. The results allow for the effect of variations in the steady flow or blade shape on the noise generated to be analysed much faster than when solving the problem numerically or considering it experimentally.
This thesis studies collider phenomenology of physics beyond the Standard Model at the Large Hadron Collider (LHC). It also explores in detail advanced topics related to Higgs boson and supersymmetry - one of the most exciting and well-motivated streams in particle physics. In particular, it finds a very large enhancement of multiple Higgs boson production in vector-boson scattering when Higgs couplings to gauge bosons differ from those predicted by the Standard Model. The thesis demonstrates that due to the loss of unitarity, the very large enhancement for triple Higgs boson production takes place. This is a truly novel finding. The thesis also studies the effects of supersymmetric partners of top and bottom quarks on the Higgs production and decay at the LHC, pointing for the first time to non-universal alterations for two main production processes of the Higgs boson at the LHC-vector boson fusion and gluon-gluon fusion. Continuing the exploration of Higgs boson and supersymmetry at the LHC, the thesis extends existing experimental analysis and shows that for a single decay channel the mass of the top quark superpartner below 175 GeV can be completely excluded, which in turn excludes electroweak baryogenesis in the Minimal Supersymmetric Model. This is a major new finding for the HEP community. This thesis is very clearly written and the introduction and conclusions are accessible to a wide spectrum of readers.
This book, written by experts in the fields of atomic physics and nonlinear science, covers the important developments in a special aspect of Bose-Einstein condensation, namely nonlinear phenomena in condensates. Topics covered include bright, dark, gap and multidimensional solitons; vortices; vortex lattices; optical lattices; multicomponent condensates; mathematical methods/rigorous results; and the beyond-the-mean-field approach.
This book is a self contained course in electromagnetic theory suitable for senior physics and electrical engineering students as well as graduate students whose past has not prepared them well for books such as Jackson or Landau and Lifschitz. The text is liberally sprinkled with worked examples illustrating the application of the theory to various physical problems. This new edition features improved accuracy and readability, added and further clarified examples, plus additional sections on Schwarz-Christoffel mappings. Making the book more self sufficient, an appendix on orthogonal function expansions and the derivation of Bessel functions and Legendre polynomials as well as derivation of their generating functions are each included. The number of exercises has also been increased by 45 over the previous edition. This book stresses the unity of electromagnetic theory with electric and magnetic fields developed in parallel. SI units are used throughout and considerable use is made of tensor notation and the Levi-Cevita symbol. To more closely display the parallelism, extensive use is made of the scalar magnetic potential particularly in dealing with the Laplace and Poisson equation. 85 worked problems illustrate the theory. Conformal mappings are dealt with in some detail. Relevant mathematical material is provided in appendices. For information regarding Solutions Manual, please contact the author Jack Vanderlinde at: [email protected] or see "Related Links - Solution Manual."
This volume, setting out the theory of positive maps as it stands today, reflects the rapid growth in this area of mathematics since it was recognized in the 1990s that these applications of C*-algebras are crucial to the study of entanglement in quantum theory. The author, a leading authority on the subject, sets out numerous results previously unpublished in book form. In addition to outlining the properties and structures of positive linear maps of operator algebras into the bounded operators on a Hilbert space, he guides readers through proofs of the Stinespring theorem and its applications to inequalities for positive maps. The text examines the maps positivity properties, as well as their associated linear functionals together with their density operators. It features special sections on extremal positive maps and Choi matrices. In sum, this is a vital publication that covers a full spectrum of matters relating to positive linear maps, of which a large proportion is relevant and applicable to today s quantum information theory. The latter sections of the book present the material in finite dimensions, while the text as a whole appeals to a wider and more general readership by keeping the mathematics as elementary as possible throughout."
It was not long ago when the consciousness was not considered a
problem for science. However, this has now changed and the problem
of consciousness is considered the greatest challenge to science.
In the last decade, a great number of books and articles have been
published in the field, but very few have focused on the how
consciousness evolves and develops, and what characterizes the
transitions between different conscious states, in animals and
humans. This book addresses these questions. Renowned researchers
from different fields of science (including neurobiology,
evolutionary biology, ethology, cognitive science, computational
neuroscience and philosophy) contribute with their results and
theories in this book, making it a unique collection of the
state-of-the-art of this young field of consciousness studies.
Dislocations are lines of irregularity in the structure of a solid
analogous to the bumps in a badly laid carpet. Like these bumps
they can be easily moved, and they provide the most important
mechanism by which the solid can be deformed. They also have a
strong influence on crystal growth and on the electronic properties
of semiconductors.
The Compendium of Theoretical Physics contains the canonical curriculum of theoretical physics. From classical mechanics over electrodynamics, quantum mechanics and statistical physics/thermodynamics, all topics are treated axiomatic-deductively and confimed by exercises, solutions and short summaries.
This book is written for students and other interested readers as a look inside the diverse range of applications for physics outside of the scientific research environment. This first volume covers several different areas of the arts and design ranging from stage lighting to sculpting. The author has interviewed experts in each area to explain how physics and technology impact their work. These are all useful examples of how physics encountered in taught courses relates to the real world.
Thin rare earth (RE) oxide films are emerging materials for microelectronic, nanoelectronic, and spintronic applications. The state-of-the-art of thin film deposition techniques as well as the structural, physical, chemical, and electrical properties of thin RE oxide films and of their interface with semiconducting substrates are discussed. The aim is to identify proper methodologies for the development of RE oxides thin films and to evaluate their effectiveness as innovative materials in different applications.
Conceived as a reference manual for practicing engineers, instrument designers, service technicians and engineering students. The related fields of physics, mechanics and mathematics are frequently incorporated to enhance the understanding of the subject matter. Historical anecdotes as far back as Hellenistic times to modern scientists help illustrate in an entertaining manner ideas ranging from impractical inventions in history to those that have changed our lives.
Modeling in Transport Phenomena, Second Edition presents and
clearly explains with example problems the basic concepts and their
applications to fluid flow, heat transfer, mass transfer, chemical
reaction engineering and thermodynamics. A balanced approach is
presented between analysis and synthesis, students will understand
how to use the solution in engineering analysis. Systematic
derivations of the equations and the physical significance of each
term are given in detail, for students to easily understand and
follow up the material.
The origin of the word synchronization is a greek root, meaning "to
share the common time." The original meaning of synchronization has
been maintained up to now in the colloquial use of this word, as
agreement or correlation in time of different processes.
Historically, the analysis of synchronization phenomena in the
evolution of dynamical systems has been a subject of active
investigation since the earlier days of physics.
Thisbookgrewoutof anongoing e?orttomodernizeColgate University's three-term, introductory, calculus-level physicscourse. Thebookisforthe ?rst term of this course and is intended to help ?rst-year college students make a good transition from high-school physics to university physics. Thebookconcentrates onthephysicsthatexplainswhywebelievethat atoms exist and have the properties we ascribe to them. This story line, which motivates much of our professional research, has helped us limit the material presented to a more humane and more realistic amount than is presented in many beginning university physics courses. The theme of atoms also supports the presentation of more non-Newtonian topics and ideas than is customary in the ?rst term of calculus-level physics. We think it is important and desirable to introduce students sooner than usual to some of the major ideas that shape contemporary physicists' views of the nature and behavior of matter. Here in the second decade of the twenty-?rst century such a goal seems particularly appropriate. The quantum nature of atoms and light and the mysteries associated with quantum behavior clearly interest our students. By adding and - phasizing more modern content, we seek not only to present some of the physics that engages contemporary physicists but also to attract students to take more physics. Only a few of our beginning physics students come to us sharply focused on physics or astronomy. Nearly all of them, h- ever, have taken physics in high school and found it interesting.
The rotating shallow water (RSW) model is of wide use as a
conceptual tool in geophysical fluid dynamics (GFD), because, in
spite of its simplicity, it contains all essential ingredients of
atmosphere and ocean dynamics at the synoptic scale, especially in
its two- (or multi-) layer version. The book describes recent
advances in understanding (in the framework of RSW and related
models) of some fundamental GFD problems, such as existence of the
slow manifold, dynamical splitting of fast (inertia-gravity waves)
and slow (vortices, Rossby waves) motions, nonlinear geostrophic
adjustment and wave emission, the role of essentially nonlinear
wave phenomena. The specificity of the book is that analytical,
numerical, and experimental approaches are presented together and
complement each other. Special attention is paid on explaining the
methodology, e.g. multiple time-scale asymptotic expansions,
averaging and removal of resonances, in what concerns theory,
high-resolution finite-volume schemes, in what concerns numerical
simulations, and turntable experiments with stratified fluids, in
what concerns laboratory simulations. A general introduction into
GFD is given at the beginning to introduce the problematics for
non-specialists. At the same time, recent new results on nonlinear
geostrophic adjustment, nonlinear waves, and equatorial dynamics,
including some exact results on the existence of the slow manifold,
wave breaking, and nonlinear wave solutions are presented for the
first time in a systematic manner.
An entirely new theory of the creation of the universe is presented based upon energy being a real substance.
The first edition of this classic book has become the authoritative reference for physicists desiring to master the finer points of statistical data analysis. This second edition contains all the important material of the first, much of it unavailable from any other sources. In addition, many chapters have been updated with considerable new material, especially in areas concerning the theory and practice of confidence intervals, including the important Feldman?Cousins method. Both frequentist and Bayesian methodologies are presented, with a strong emphasis on techniques useful to physicists and other scientists in the interpretation of experimental data and comparison with scientific theories. This is a valuable textbook for advanced graduate students in the physical sciences as well as a reference for active researchers. |
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