Report of Research Activities PDF Download

Author: Yale University. Cowles Foundation for Research in Economics
Publisher:
ISBN:
Category : Economics
Languages : en
Pages : 80

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Author: Matti Pitkanen
Publisher: Luniver Press
ISBN: 0955117089
Category : Mathematics
Languages : en
Pages : 822

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Topological GeometroDynamics is a modification of general relativity inspired by the conceptual problems related to the definitions of inertial and gravitational energy in general relativity. Topological geometrodynamics can be also seen as a generalization of super string models. Physical space-times are seen as four-dimensional surfaces in certain eight-dimensional space. The choice of this space is fixed by symmetries of the standard model so that geometrization of known classical fields and elementary particle quantum numbers results. The notion of many-sheeted space-time allows re-interpretation of the structures of perceived world in terms of macroscopic space-time topology. The generalization of the number concept based on fusion of real numbers and p-adic number fields implies a further generalization of the space-time concept allowing to identify space-time correlates of cognition and intentionality. Quantum measurement theory extended to a quantum theory of consciousness becomes an organic part of theory. A highly non-trivial prediction is the existence of a fractal hierarchy of copies of standard model physics with dark matter identified in terms of macroscopic quantum phases characterized by dynamical and quantized Planck constant. The book is a comprehensive overview and analysis of topological geometrodynamics as a mathematical and physical theory.

Author: Eftychia Tzovara
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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The predictions of the Standard Model (SM) of particle physics have been probed with remarkable accuracy, so far. The Large Hadron Collider (LHC) at CERN has significantly contributed to this quest. A remarkable achievement of the ATLAS and CMS experiments at the LHC was the discovery of the Higgs boson in 2012, the last missing piece of the SM. With the increasing amount of proton-proton collisions delivered by the LHC, more precise measurements of the Higgs boson are now possible, while rare processes are accessible as well. A property of the Higgs boson that is of particular importance is its coupling to the top quark, which is expected to be the strongest in the SM due to the high mass of the top quark. Therefore, its precise measurement is a stringent test of the SM. A direct measurement of the top-quark Yukawa coupling can be assessed through the Higgs-boson production in association with a pair of top quarks (ttH). This thesis presents the measurement of the ttH process with a subsequent Higgs-boson decay to a pair of b-quarks (H -> bb), the decay mode with the largest branching ratio. The measurement is performed with data collected by the ATLAS detector, corresponding to an integrated luminosity of 139 fb^-1 at a center-of-mass energy of 13 TeV. Events with one or two charged leptons from the tt decay in the final state are considered to the measurement. The main challenge of the ttH(H -> bb) channel emerges from the large SM backgrounds from the production of top-quark pairs with additional jets (tt+jets). Also the many jets coming from b-hadrons (b-jets) in the final state cause combinatorial ambiguities. Thus, the identification of such jets is decisive in order to determine the signal and reject many background processes. The ttH events are split into exclusive analysis regions, based on the number of leptons, jets, and jets tagged as b-jets, providing regions enhanced in signal, or in the main background components. Specifically in the single-lepton channel, a boosted category is defined by selecting events in which the Higgs boson and possibly also the hadronically decaying top quark are produced with high transverse momentum (pT), with their decay products being collimated in large-radius jets. The single-lepton boosted channel targets events with Higgs-boson candidate pT >= 300 GeV and is the main scope of this thesis. To identify the reconstructed objects with the underlying particles and to maximise the discrimination of the ttH signal from the overwhelming tt+jets background events in the signal-enriched regions, machine-learning algorithms are employed. The background is dominated by a tt process with an additional gluon in the final state which further splits into a pair of b-quarks (tt+bb). Besides, a large number of heavy-flavour jets in the final state is not well modelled, thus many systematic uncertainties have to be considered, decreasing the sensitivity of the measurement. All the defined analysis regions are analysed together in a combined profile likelihood fit to test for the presence of signal. The fit simultaneously determines the event yields for the signal and the most important background component, while constraining the overall background model within the assigned systematic uncertainties. Eventually, the ratio of the measured ttH cross section to the SM expectation in the inclusive cross-section measurement is found to be 0.35 +0.36,-0.34}, corresponding to an observed (expected) significance of 1.0 (2.7) standard deviations. A ttH signal strength larger than the SM prediction is excluded at 95% confidence level. The measurement uncertainty is dominated by systematic uncertainties, mainly regarding the theoretical knowledge of the tt +>= 1b background process. Finally, to further test the SM, the cross-section is measured differentially as a function of the generator-level Higgs-boson pT, taking advantage of the reconstruction of the Higgs-boson kinematics.

Author: Flora of North America Editorial Committee
Publisher:
ISBN: 9780195305630
Category : Science
Languages : en
Pages : 620

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Book Description
FNA presents for the first time, in one published reference source, information on the names, taxonomic relationships, continent-wide distributions, and morphological characteristics of all plants native and naturalized found in North America north of Mexico.

Author: Holly Hearon
Publisher: Wipf and Stock Publishers
ISBN: 155635990X
Category : Religion
Languages : en
Pages : 201

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Book Description
This cutting-edge volume has been brought together in honor of Thomas Boomershine, author, scholar, storyteller, innovator. The particular occasion inviting this recognition of his work is the twenty-fifth anniversary of the Society of Biblical Literature's section on The Bible in Ancient and Modern Media (BAMM), which Tom was instrumental in founding. For two and half decades this program unit has provided scholars with opportunities to explore and experience biblical material in media other than silent print, including both oral and multimedia electronic performances. This book explores many, though by no means all, of the issues lifted up in those sessions over the years. Contributors A. K. M. Adam Adam Gilbert Bartholomew Arthur J. Dewey Dennis Dewey Joanna Dewey Robert M. Fowler Holly E. Hearon David Rhoads Philip Ruge-Jones Whitney T. Shiner Marti J. Steussy Richard W. Swanson

Author: R.A. Duff
Publisher: Oxford University Press
ISBN: 0199600554
Category : Law
Languages : en
Pages : 278

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Book Description
This is the first book of a series on criminalization - examining the principles and goals that should guide what kinds of conduct are to be criminalized, and the forms that criminalization should take. The first volume studies the scope and boundaries of the criminal law - asking what principled limits might be placed on criminalizing behaviour.

Author: Harry Weerts
Publisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 492

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East Lansing, Michigan, 14-18 June 2004

Author: Heinz Oberhummer
Publisher: Springer Science & Business Media
ISBN: 3642488404
Category : Science
Languages : en
Pages : 242

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Book Description
Nuclear astrophysics as it stands today is a fascinating science. Even though, compared to other scientific fields, it is a young discipline which has developed only in this century, it has answered many questions concerning the under standing of our cosmos. One of these great achievements was the concept of nucleosynthesis, the creation of the elements in the early universe in interstellar matter and in stars. Nuclear astrophysics has continued, to solve many riddles of the evolution of the myriads of stars in our cosmos. This review volume attempts to provide an overview of the current status of nuclear astrophysics. Special emphasis is given to the interdisciplinary nature of the field: astronomy, nuclear physics, astrophysics and particle physics are equally involved. One basic effort of nuclear astrophysics is the collection of ob servational facts with astronomical methods. Laboratory studies of the nuclear processes involved in various astrophysical scenarios have provided fundamen tal information serving both as input for and test of astrophysical models. The theoretical understanding of nuclear reaction mechanisms is necessary, for example, to extrapolate the experimentally determined reaction rates to the thermonuclear energy range, which is relevant for the nuclear processes in our cosmos. Astrophysical models and calculations allow us to simulate how nuclear processes contribute to driving the evolution of stars, interstellar matter and the whole universe. Finally, elementary particle physics also plays an important role in the field of nuclear astrophysics, for instance through weak interaction processes involving neutrinos.

Author: Sanwar M. Jharwal
Publisher: Academic Foundation
ISBN: 9788171885978
Category : Business & Economics
Languages : en
Pages : 1036

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Book Description
Authentic and authoritative, this presentation shares a comprehensive overview of the extensive research undertaken by the Agro Economic Research Centers (AERCs) and the concerns confronting Indian agriculture. Established across the states in India to provide policy feedback to the Ministry of Agriculture, the AERCs generated many important research initiatives and debates over five decades. This second volume focuses on the problems confronted at the regional level by each of the participating states.

Author: Ali Mohammad
Publisher: Concept Publishing Company
ISBN: 9788180693601
Category : Agricultural productivity
Languages : en
Pages : 372

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Book Description
Contributed papers presented at the conference organized by Dept. of Geography, Aligarh Muslim University.