21 research outputs found
University of Minnesota Morris Historic Preservation Plan: A Plan for Landscape & Buildings
This historic preservation plan explores the origins of UMMâs landscape and buildings, describes how they evolved through time, assesses their current condition, and recommends practical strategies to carry the resources into the future
Measurement of the Triple-Differential Cross-Section for the Production of Multijet Events using 139 fb^{-1} of Proton-Proton Collision Data at \sqrt{s} = 13 TeV with the ATLAS Detector to Disentangle Quarks and Gluons at the Large Hadron Collider
At hadron-hadron colliders, it is almost impossible to obtain pure samples in either quark-
or gluon-initialized hadronic showers as one always deals with a mixture of particle jets.
The analysis presented in this dissertation aims to break the aforementioned degeneracy by
extracting the underlying fractions of (light) quarks and gluons through a measurement of the
relative production rates of multijet events.
A measurement of the triple-differential multijet cross section at a centre-of-mass energy of
13 TeV using an integrated luminosity of 139 fb â1 of data collected with the ATLAS detector
in proton-proton collisions at the Large Hadron Collider (LHC) is presented. The cross section
is measured as a function of the transverse momentum p T , two categories of pseudorapidity
η rel defined by the relative orientation between the jets, as well as a Jet Sub-Structure (JSS)
observable O JSS , sensitive to the quark- or gluon-like nature of the hadronic shower of the two
leading-p T jets with 250 GeV < p T < 4.5 TeV and |η| < 2.1 in the event.
The JSS variables, which have been studied within the context of this thesis, can broadly be
divided into two categories: one set of JSS observables is constructed by iteratively declustering
and counting the jetâs charged constituents; the second set is based on the output predicted by
Deep Neural Networks (DNNs) derived from the âdeep setsâ paradigm to implement permutation
invariant functions over sets, which are trained to discriminate between quark- and gluon-
initialized showers in a supervised fashion.
All JSS observables are measured based on Inner Detector tracks with p T > 500 MeV
and |η| < 2.5 to maintain strong correlations between detector- and particle-level objects.
The reconstructed spectra are fully corrected for acceptance and detector effects, and the
unfolded cross section is compared to various state-of-the-art parton shower Monte Carlo
models. Several sources of systematic and statistical uncertainties are taken into account that
are fully propagated through the entire unfolding procedure onto the final cross section. The
total uncertainty on the cross section varies between 5 % and 20 % depending on the region of
phase space.
The unfolded multi-differential cross sections are used to extract the underlying fractions
and probability distributions of quark- and gluon-initialized jets in a solely data-driven, model-
independent manner using a statistical demixing procedure (âjet topicsâ), which has originally
been developed as a tool for extracting emergent themes in an extensive corpus of text-based
documents. The obtained fractions are model-independent and are based on an operational
definition of quark and gluon jets that does not seek to assign a binary label on a jet-to-jet basis,
but rather identifies quark- and gluon-related features on the level of individual distributions,
avoiding common theoretical and conceptional pitfalls regarding the definition of quark and
gluon jets.
The total fraction of gluon-initialized jets in the multijet sample is (IRC-safely) measured
to be 60.5 ± 0.4(Stat) â 2.4(Syst) % and 52.3 ± 0.4(Stat) â 2.6(Syst) % in central and forward
region, respectively. Furthermore, the gluon fractions are extracted in several exclusive regions
of transverse momentum
Comparison of the vocabularies of the Gregg shorthand dictionary and Horn-Peterson's basic vocabulary of business letters
This study is a comparative analysis of the vocabularies of Horn and Peterson's The Basic Vocabulary of Business Letters1 and the Gregg Shorthand Dictionary.2 Both books purport to present a list of words most frequently encountered by stenographers and students of shorthand. The, Basic Vocabulary of Business Letters, published "in answer to repeated requests for data on the words appearing most frequently in business letters,"3 is a frequency list specific to business writing. Although the book carries the copyright date of 1943, the vocabulary was compiled much earlier. The listings constitute a part of the data used in the preparation of the 10,000 words making up the ranked frequency list compiled by Ernest Horn and staff and published in 1926 under the title of A Basic Writing Vocabulary: 10,000 Words Lost Commonly Used in Writing. The introduction to that publication gives credit to Miss Cora Crowder for the contribution of her Master's study at the University of Minnesota concerning words found in business writing. With additional data from supplementary sources, the complete listing represents twenty-six classes of business, as follows 1. Miscellaneous 2. Florists 3. Automobile manufacturers and sales companie
Strange Concepts and the Stories They Make Possible
Fantastic tales of rebellious robots and animated artifacts are a permanent fixture in popular culture. What kind of behavior do we expect from such conceptual hybrids in science fiction, nonsense poetry, and surrealist art
Meiosis
Meiosis, the process of forming gametes in preparation for sexual reproduction, has long been a focus of intense study. Meiosis has been studied at the cytological, genetic, molecular and cellular levels. Studies in model systems have revealed common underlying mechanisms while in parallel, studies in diverse organisms have revealed the incredible variation in meiotic mechanisms. This book brings together many of the diverse strands of investigation into this fascinating and challenging field of biology
Food science sourcebook
2 v. : ill. ; 26 cm2nd edition.Rev. ed. of: Source book for food scientists. c1978"An AVI book."Pt. 1. Terms and descriptions -- pt. 2. Food composition,properties, and general data
Biocultural Restoration in Hawaiʻi
Biocultural restoration is a process by which the various connections between humanity and nature, as well as between People and Place are revived to restore the health and function of social-ecological systems. This collection explores the subject of biocultural restoration and does so within the context of HawaiÊ»i, the most remote archipelago on the planet. The Hawaiian Renaissance, which started in the 1970s, has led to a revival of Hawaiian language, practices, philosophy, spirituality, knowledge systems, and systems of resource management. Many of the leading Indigenous and local scholars of HawaiÊ»i who were born into the time of the Hawaiian Renaissance contributed to this collection. More than a third of the authors are of Indigenous Hawaiian ancestry; each paper had at least one Indigenous Hawaiian author, and several papers had a Hawaiian lead author, making this the largest collection to date of scientific publications authored by Indigenous Hawaiians (KÄnaka Ê»Ćiwi). In addition, the majority of authors are women, and two of the papers had 100 percent authorship by women. This collection represents a new emphasis in applied participatory research that involves academics, government agencies, communities and both private and non-profit sectors