cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Quantification of synthetic-based drilling mud olefins in crude oil and oiled sediment by liquid column silver nitrate and gas chromatography
Creators: name: Stout, Scott A.
name: Litman, Eric R.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Space Science
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Synthetic-based drilling muds (SBMs) are complex mixtures of man-made fluids used during the drilling of oil and gas wells. SBM-derived chemicals can enter the environment through failed wells and routine or poor disposal practices, where they can persist and thereby warrant measurement. SBMs are commonly formulated with linear and methyl branched α- and internal-olefins mostly in the C14 to C20 carbon range, which are not native to crude oils. Thus, SBM-derived olefins can provide a basis to recognize the impact of these drilling wastes in the environment. However, the presence of abundant native hydrocarbons in oils and sediments can hinder the detection of trace level SBM-derived olefins by conventional organic sample preparation and analytical methods. Silver ion chromatography using silver nitrate (AgNO3) impregnated silica gel can serve to physically separate olefins from saturated aliphatic hydrocarbons native in crude oils, which can subsequently be analyzed and measured by conventional one-dimensional gas chromatography-flame ionization detection (GC-FID). In this study, SBM-derived olefins are measured in crude oils from the Deepwater Horizon oil spill and in their laboratory mixtures to a detection limit of approximately 5000 µg/g (0.5 wt%). In oiled sediment, SBM-derived olefins were reliably detected at concentrations as low as 1 µg/g-dry. An application of this method is demonstrated through analysis of crude oils and oil-contaminated seafloor sediment from the Taylor Energy oil spill site in the northern Gulf of Mexico where SBM was historically used and discharged.
Lower bounds for topological complexity
Creators: name: Franc, Aleksandra
name: Pavešić, Petar
Publisher: name: arXiv
Year: 2011
Subjects: subject: Algebraic Topology (math.AT)
subject: FOS: Mathematics
subject: 55R70, 55M30

description: We introduce fibrewise Whitehead- and fibrewise Ganea definitions of monoidal topological complexity. We then define several lower bounds for the topological complexity, which improve on the standard lower bound in terms of nilpotency of the cohomology ring. The relationships between these lower bounds are studied.
description: 19 pages, 1 figure
Tense SHn--algebras
Creators: name: Figallo, Aldo V.
name: Pelaitay, Gustavo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics

description: In 1982, L. Iturrioz introduced symmetrical Heyting algebras of order n (or SHn-algebras). In this paper, we define and study tense SHn-algebras namely, SHn-algebras endowed with two tense operators. These algebras constitute a generalization of tense Lukasiewicz-Moisil algebras. Our main interest is the duality theory for tense SHn- algebras. In order to do this, we requiere Esakia's duality for Heyting algebras and Goldblatt's duality for bounded distributive lattices with operations.
description: This paper has been withdrawn by the author due to a crucial sign error in equation 1
Quantification of synthetic-based drilling mud olefins in crude oil and oiled sediment by liquid column silver nitrate and gas chromatography
Creators: name: Stout, Scott A.
name: Litman, Eric R.
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biochemistry
subject: Space Science
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
subject: Biological Sciences not elsewhere classified
subject: Inorganic Chemistry
subject: FOS: Chemical sciences

description: Synthetic-based drilling muds (SBMs) are complex mixtures of man-made fluids used during the drilling of oil and gas wells. SBM-derived chemicals can enter the environment through failed wells and routine or poor disposal practices, where they can persist and thereby warrant measurement. SBMs are commonly formulated with linear and methyl branched α- and internal-olefins mostly in the C14 to C20 carbon range, which are not native to crude oils. Thus, SBM-derived olefins can provide a basis to recognize the impact of these drilling wastes in the environment. However, the presence of abundant native hydrocarbons in oils and sediments can hinder the detection of trace level SBM-derived olefins by conventional organic sample preparation and analytical methods. Silver ion chromatography using silver nitrate (AgNO3) impregnated silica gel can serve to physically separate olefins from saturated aliphatic hydrocarbons native in crude oils, which can subsequently be analyzed and measured by conventional one-dimensional gas chromatography-flame ionization detection (GC-FID). In this study, SBM-derived olefins are measured in crude oils from the Deepwater Horizon oil spill and in their laboratory mixtures to a detection limit of approximately 5000 µg/g (0.5 wt%). In oiled sediment, SBM-derived olefins were reliably detected at concentrations as low as 1 µg/g-dry. An application of this method is demonstrated through analysis of crude oils and oil-contaminated seafloor sediment from the Taylor Energy oil spill site in the northern Gulf of Mexico where SBM was historically used and discharged.
Averages of Fourier coefficients of Siegel modular forms and representation of binary quadratic forms by quadratic forms in four variables
Creators: name: Schulze-Pillot, Rainer
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: Primary 11E12, Secondary 11F27, 11F30, 11F46, 11E45

description: Let $-d$ be a a negative discriminant and let $T$ vary over a set of representatives of the integral equivalence classes of integral binary quadratic forms of discriminant $-d$. We prove an asymptotic formula for $d \to \infty$ for the average over $T$ of the number of representations of $T$ by an integral positive definite quaternary quadratic form and obtain results on averages of Fourier coefficients of linear combinations of Siegel theta series. We also find an asymptotic bound from below on the number of binary forms of fixed discriminant $-d$ which are represented by a given quaternary form. In particular, we can show that for growing $d$ a positive proportion of the binary quadratic forms of discriminant $-d$ is represented by the given quaternary quadratic form.
description: v5: Some typos corrected
Development of a two stage liability allocation process in case of multiple party pollution
Creators: name: Priya, Lakshmi
name: Varghese, George K.
name: Pivato, Alberto
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Space Science
subject: Physical Sciences not elsewhere classified
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Science Policy
subject: Computational Biology

description: Liability allocation in pollution incidents involving multiple polluters is a challenging task even in cases where thorough forensic investigation has been carried out. A two-stage liability allocation process, i.e., technical liability allocation carried out by technical experts followed by legal liability allocation, is suggested for adoption in such cases. The liability allocation may be required for the impacts of pollution and/or for remediation of the polluted site. The first stage of liability allocation, i.e., technical liability allocation is discussed in the paper. The study identified and evaluated the most relevant technical factors that should be considered for responsibility allocation. These factors, quantified from the results of an environmental forensic investigation, can be aggregated as ‘Impact index’ and ’Remediation index’ for use in liability allocation. A method for the estimation of ’Impact index’ and ’Remediation index’ is suggested. The study argues that the overall liability allocation can be made more efficient and faster when the liability allocation is a two-stage process.
Additional file 8 of R-Ras subfamily proteins elicit distinct physiologic effects and phosphoproteome alterations in neurofibromin-null MPNST cells
Creators: name: Weber, Shannon M.
name: Brossier, Nicole M.
name: Prechtl, Amanda
name: Barnes, Stephen
name: Wilson, Landon S.
name: Brosius, Stephanie N.
name: Longo, Jody Fromm
name: Carroll, Steven L.
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Pharmacology
subject: Science Policy
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: Computational Biology

description: Additional file 8
Contextual identities : narratives of self-identified shy adolescents' close friendship experiences in online and offline settings
Creators: name: Tan, Joanna Ee Na
Publisher: name: University of British Columbia
Year: 2014

description: As the Internet has evolved over the past decade, adolescents now tend to communicate with existing offline friends instead of strangers. However, a particular profile of shy and introverted users seems to prefer communicating with online-exclusive friends. This qualitative study aimed to explore how self-identified shy adolescents constructed their identities through their narratives of close friendships in online and offline settings. With a focus on “contextual identities”, I examined how the context may influence identity construction and social processes, as well as how continuity and change across the online-offline divide surfaced in the narratives. Six female adolescents aged 14 to 18 years were recruited, where online interviews were carried out using an adaptation of Arvay’s (2003) reflexive collaborative narrative method. The narratives were analyzed with a holistic-content approach by Lieblich, Tuval-Mashiach, and Zilber (1998) to preserve the unique voice of each participant. This was followed by a cross-case analysis (Stake, 2006) that yielded the following six findings: (1) Adolescents constructed a reticent identity through enacting a generalized worldview of an untrustworthy social environment, due to experiences of broken trust or perceived rejection. (2) Adolescents presented a self-concept of diffidence and insecurity through recounting childhood experiences that undermined their development of competence and autonomy. (3) Adolescents constructed a shy self-concept through identifying personal deficits in relation to societal referential standards, and concurrently constructed role identities that put themselves in positions of strength. (4) Trust, as a main factor in overcoming the fear of self-disclosure, was more easily established in online autonomous dyadic interactions than in offline settings where group structures and norms limited the freedom to be themselves. (5) Online affordances built social competence by providing a scaffold for overcoming the fear of self-disclosure and replicating offline social practices which accelerated intimacy development. (6) Shy identities seemed contextualized to the general offline interactional experience, but these could change over time with new positive experiences in offline settings via increased self-confidence or self-acceptance. These findings, together with educational implications and future research, are discussed.
On the stationary BBGKY hierarchy for equilibrium states
Creators: name: Genovese, Giuseppe
name: Simonella, Sergio
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: A new direct integration method is established to construct the solutions of the stationary BBGKY hierarchy, assuming the usual form of the equilibrium correlation functions, for infinite classical systems of particles interacting via a smooth, stable and regular two body potential. The equivalence between the corresponding infinite hierarchy and the Kirkwood--Salsburg equations is proved. A problem of existence and uniqueness of the solutions of the hierarchy with appropriate boundary conditions is thus solved for low densities. The result is extended in a milder sense to systems with a hard core interaction. Comparisons are provided with different integration techniques.
Ermittlung regionalisierter Extremwasserstände für die Schleswig-Holsteinische Nordseeküste
Creators: name: Arns, Arne
Publisher: name: Bundesanstalt für Gewässerkunde, Koblenz
Year: 2013
Subjects: subject: Water resources research

description: Hydrologie und Wasserbewirtschaftung / BfG – Jahrgang: 57.2013,6 - ISSN 1439-1783
Additional file 9 of R-Ras subfamily proteins elicit distinct physiologic effects and phosphoproteome alterations in neurofibromin-null MPNST cells
Creators: name: Weber, Shannon M.
name: Brossier, Nicole M.
name: Prechtl, Amanda
name: Barnes, Stephen
name: Wilson, Landon S.
name: Brosius, Stephanie N.
name: Longo, Jody Fromm
name: Carroll, Steven L.
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Physiology
subject: Pharmacology
subject: Science Policy
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: Computational Biology

description: Additional file 9
Vorhersage der regionalen, langjährigen bodenbürtigen Grundwasserneubildung mit hydrologischen Pedontransferfunktionen
Creators: name: Miegel, Konrad
Publisher: name: Bundesanstalt für Gewässerkunde, Koblenz
Year: 2013
Subjects: subject: Water resources research

description: Hydrologie und Wasserbewirtschaftung / BfG – Jahrgang: 57.2013,6 - ISSN 1439-1783
Evolution of correlation functions in the hard sphere dynamics
Creators: name: Simonella, Sergio
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The series expansion for the evolution of the correlation functions of a finite system of hard spheres is derived from direct integration of the solution of the Liouville equation, with minimal regularity assumptions on the density of the initial measure. The usual BBGKY hierarchy of equations is then recovered. A graphical language based on the notion of collision history originally introduced by Spohn is developed, as a useful tool for the description of the expansion and of the elimination of degrees of freedom.
Force transfer around openings in CLT shear walls
Creators: name: Pai, Sai Ganesh Sarvotham
Publisher: name: University of British Columbia
Year: 2014

description: During an earthquake, shear walls can experience damage around corners of doors and windows due to development of stress concentration. Reinforcements provided to minimize this damage are designed for forces that develop at these corners known as transfer forces. In this thesis, the focus is on understanding the forces that develop around opening corners in cross laminated timber (CLT) shear walls and reinforcement requirements for the same. In the literature, four different analytical models are commonly considered to determine the transfer force for design of wood-frame shear walls. These models have been reviewed in this thesis. The Diekmann model is found to be the most suitable analytical model to determine the transfer force around a window-type opening. Numerical models are developed in ANSYS to analyse the forces around opening corners in CLT shear walls. CLT shear walls with cut-out openings are analysed using a three-dimensional brick element model and a frame model. These models highlight the increase in shear and torsion around opening corners due to stress concentration. The coupled-panel construction practice for CLT shear walls with openings is analysed using a continuum model calibrated to experimental data. The analysis shows the increase in strength and stiffness of walls, when tie-rods are used as reinforcement. Analysis results also indicate that the tie-rods should be designed to behave linearly for optimum performance of the wall. Finally, a linear regression model is developed to determine the stiffness of a simply-supported CLT shear wall with a window-type opening. This model provides insight into the effect of various geometrical and material parameters on the stiffness of the wall. The process of model development has been explained, which can be improved further to include the behaviour of anchors.
Higher-order illative combinatory logic
Creators: name: Czajka, Łukasz
Publisher: name: arXiv
Year: 2012
Subjects: subject: Logic (math.LO)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We show a model construction for a system of higher-order illative combinatory logic $\mathcal{I}_ω$, thus establishing its strong consistency. We also use a variant of this construction to provide a complete embedding of first-order intuitionistic predicate logic with second-order propositional quantifiers into the system $\mathcal{I}_0$ of Barendregt, Bunder and Dekkers, which gives a partial answer to a question posed by these authors.
Noncommutative Hodge-to-de Rham spectral sequence and the Heegaard Floer homology of double covers
Creators: name: Lipshitz, Robert
name: Treumann, David
Publisher: name: arXiv
Year: 2012
Subjects: subject: Symplectic Geometry (math.SG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: Let A be a dg algebra over F_2 and let M be a dg A-bimodule. We show that under certain technical hypotheses on A, a noncommutative analog of the Hodge-to-de Rham spectral sequence starts at the Hochschild homology of the derived tensor product of M with itself and converges to the Hochschild homology of M. We apply this result to bordered Heegaard Floer theory, giving spectral sequences associated to Heegaard Floer homology groups of certain branched and unbranched double covers.
description: 41 pages, 4 figures. V2: expanded introduction to further contextualize the results; added background section. V3: corrections, improvements thanks to referee. Covering space result significantly strengthened
Additional file 2 of Machine learning methods to predict 30-day hospital readmission outcome among US adults with pneumonia: analysis of the national readmission database
Creators: name: Huang, Yinan
name: Talwar, Ashna
name: Lin, Ying
name: Aparasu, Rajender R.
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Mathematical Sciences not elsewhere classified

description: Additional file 2. Study Cohort Derivation and Characteristics.
Typical orbits of quadratic polynomials with a neutral fixed point: Brjuno type
Creators: name: Cheraghi, Davoud
Publisher: name: arXiv
Year: 2012
Subjects: subject: Dynamical Systems (math.DS)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 37F50 (Primary), 58F12 (Secondary)

description: We describe the topological behavior of typical orbits of complex quadratic polynomials P_alpha(z)=e^{2πi alpha} z+z^2, with alpha of high return type. Here we prove that for such Brjuno values of alpha the closure of the critical orbit, which is the measure theoretic attractor of the map, has zero area. Then combining with Part I of this work, we show that the limit set of the orbit of a typical point in the Julia set is equal to the closure of the critical orbit.
description: 38 pages, 5 figures; fixed the issues with processing the figures
The online linguistic database : software for linguistic fieldwork
Creators: name: Dunham, Joel Robert William
Publisher: name: University of British Columbia
Year: 2014

description: The documentation and analysis of endangered languages is a core component of the linguistic endeavour. Language consultants and linguistic researchers collaborate to generate a variety of data which in turn fuel theoretical discovery and language revitalization. This dissertation describes and evaluates a piece of software designed to facilitate new, and enhance existing, collaboration, documentation, and analysis. But beyond this, it argues for the value of a certain methodological approach to linguistics broadly construed, one in which computation is key and where provisions are made for collaboration, data-sharing and data reuse. The Online Linguistic Database (OLD) is open source software for creating web applications that facilitate collaborative linguistic fieldwork. The OLD allows fieldworkers to continue doing what they are already doing—eliciting, transcribing, recording, and analyzing forms and creating data sets and papers with them—but collaboratively. This point should not be understated: though practises are changing, linguistic fieldwork currently involves a loose network of relatively isolated practitioners and data sets; simply creating the infrastructure for collaboration and data-sharing is half the battle. The other half is creating features and conveniences that make the software worth using. In this domain, the OLD provides automated feedback on lexical consistency of morphological analyses, sophisticated search, the creation and (structural) searching of arbitrarily many corpora and treebanks, and the specification and computational implementation of models of the lexicon, phonology, and morphology, upon which are built practical morphological parsers. The dissertation describes the OLD, motivating its design decisions and arguing that it has the potential to contribute positively to the achievement of the three core goals of linguistic fieldwork, namely documentation, research, and language revitalization. Particular attention is paid to the practical and research-related advantages of the morphophonological modelling capability with examples and evaluations of morphological parsers created for the Blackfoot language.
Theory of integer quantum Hall effect in insulating bilayer graphene
Creators: name: Roy, Bitan
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A variational ground state for insulating bilayer graphene (BLG), subject to quantizing magnetic fields, is proposed. Due to the Zeeman coupling, the layer anti-ferromagnet (LAF) order parameter in fully gapped BLG gets projected onto the spin easy plane, and simultaneously a ferromagnet order, which can further be enhanced by exchange interaction, develops in the direction of the magnetic field. The activation gap for the $ν=0$ Hall state then displays a crossover from quadratic to linear scaling with the magnetic field, as it gets stronger, and I obtain excellent agreement with a number of recent experiments with realistic strengths for the ferromagnetic interaction. A component of the LAF order, parallel to the external magnetic field, gives birth to additional incompressible Hall states at filling $ν=\pm 2$, whereas the remote hopping in BLG yields $ν=\pm 1$ Hall states. Evolution of the LAF order in tilted magnetic fields, scaling of the gap at $ν=2$, the effect of external electric fields on various Hall plateaus, and different possible hierarchies of fractional quantum Hall states are highlighted.
description: Published version: 5 pages, 2 figures (Supplementary: 6 pages, 2 figures); New references, typos corrected
A Field-directional Specific Heat Study on the Gap Structure of Overdoped Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$
Creators: name: Mu, Gang
name: Tang, Jun
name: Tanabe, Yoichi
name: Xu, Jingtao
name: Zeng, Bin
name: Shen, Bing
name: Han, Fei
name: Wen, Hai-Hu
name: Heguri, Satoshi
name: Tanigaki, Katsumi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Low-temperature specific heat is measured on the overdoped Ba(Fe_{1-x}Co_x)_2As_2 (x = 0.13) single crystal under magnetic fields along three different directions. A clear anisotropy is observed on the field dependent electronic specific heat coefficient γ(H). The value of γ(H) is obviously larger with magnetic field along [001] (c-axis) than that within the ab-plane of the crystal lattice, which cannot be attributed to the effect by anisotropy of the upper critical field. Meanwhile, the data show a rather small difference when the direction of the field is rotated from [100] to [110] direction within the ab-plane. Our results suggest that a considerable part of the line nodes is not excited to contribute to the quasiparticle density of states by the field when the field is within the ab-plane. The constraints on the topology of the gap nodes are discussed based on our observations.
description: 13 pages, 4 figures
The Bannai-Ito polynomials as Racah coefficients of the sl_{-1}(2) algebra
Creators: name: Genest, Vincent X.
name: Vinet, Luc
name: Zhedanov, Alexei
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The Bannai-Ito polynomials are shown to arise as Racah coefficients for sl_{-1}(2). This Hopf algebra has four generators including an involution and is defined with both commutation and anticommutation relations. It is also equivalent to the parabosonic oscillator algebra. The coproduct is used to show that the Bannai-Ito algebra acts as the hidden symmetry algebra of the Racah problem for sl_{-1}(2). The Racah coefficients are recovered from a related Leonard pair.
description: 15 pp
Twisted orbifold Gromov-Witten invariants
Creators: name: Tonita, Valentin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Geometry (math.AG)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics

description: Let $\ix$ be a smooth Deligne-Mumford stack over the complex numbers. One can define twisted orbifold Gromov-Witten invariants of $\ix$ by considering multiplicative invertible characteristic classes of various bundles on the moduli spaces of stable maps $\ix_{g,n,d}$, cupping them with evaluation and cotangent line classes and then integrating against the virtual fundamental class. These are more general than the twisted invariants introduced by Tseng. We express the generating series of the twisted invariants in terms of the generating series of the untwisted ones. We derive the corollaries which are used in the work of Givental-Tonita on the quantum K-theory of a complex manifold X.
description: 43 pages, 1 figure. Corrected a small error in Lemma 3.10 and its consequences. Modified slightly Corollary 6.3
Explicit asymptotic velocity of the boundary between particles and antiparticles
Creators: name: Malyshev, V. A.
name: Manita, A. D.
name: Zamyatin, A. A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 60J25

description: On the real line initially there are infinite number of particles on the positive half-line., each having one of $K$ negative velocities $v_{1}^{(+)},...,v_{K}^{(+)}$. Similarly, there are infinite number of antiparticles on the negative half-line, each having one of $L$ positive velocities $v_{1}^{(-)},...,v_{L}^{(-)}$. Each particle moves with constant speed, initially prescribed to it. When particle and antiparticle collide, they both disappear. It is the only interaction in the system. We find explicitly the large time asymptotics of $β(t)$ - the coordinate of the last collision before $t$ between particle and antiparticle.
description: 25 pages
The effects of polymer-mediated immunocamouflage on allorecognition of blood cells
Creators: name: Price, Dana
Publisher: name: University of British Columbia
Year: 2014

description: Allorecognition initiates the adverse events of red blood cell (RBC) alloimunization and tissue rejection. Current clinical approaches utilize tissue matching (HLA and blood typing) and immunosuppressive agents to attenuate allorecognition. These practices, however, lead to inventory and drug toxicity issues. Immunocamouflage of cell surfaces by the covalent grafting of methoxypoly(ethylene glycol) (mPEG; PEGylation) has potential utility for prevention of allorecognition. Previous studies have demonstrated the efficacy of immune cell and tissue immunocamouflage both in vitro and in vivo. However, the use of alternative polymers and the consequences of surface modification during allorecognition events have not been fully defined. To this end, we compared the traditionally utilized mPEG, to a novel polymer species polyethyloxazoline (PEOZ) to explore the effects of polymer grafting to human RBC and leukocytes (WBC) on cell structure, function, viability, as well as allorecognition. PEOZ has attributes that make it an attractive alternative to mPEG, and from a cellular bioengineering perspective, the low viscosity and decreased hydrophilicity of PEOZ could offer some biological and therapeutic advantages. Our studies showed that although PEOZ mediated significant immunocamouflage of cells, mPEG demonstrated improved efficacy in RBC studies. However, PEOZ would be useful for the immunocamouflage of cells, especially for patients that exhibit anti-PEG antibodies. Furthermore, we assessed the consequences of mPEG surface modification to WBC interactions and intracellular events during allorecognition. Our results demonstrated significant camouflage of surface proteins; decreased cell interactions; reduced NFκB activation, which resulted in decreased inflammatory cytokines such as IL2 and IL2Rα expression; and minimal effects to cell viability in modified cells during allogeneic challenge. The global camouflage of cells may decrease activation of numerous pathways and events responsible for cell proliferation during allorecognition. This makes PEGylation a viable non-toxic alternative to current immunosuppressive therapies. These findings demonstrated the therapeutic potential of both traditional mPEG and novel polymer alternatives. Furthermore, this work defined several mechanisms responsible for the decreased alloresponse of immunocamouflaged cells. Our results showed the clear potential for polymer-based bioengineering to modulate the immune response to allogeneic cells and would be useful for the prevention of allorecognition in transplantation and transfusion medicine.
Categorification of persistent homology
Creators: name: Bubenik, Peter
name: Scott, Jonathan A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Topology (math.AT)
subject: Computational Geometry (cs.CG)
subject: Category Theory (math.CT)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: 55N99, 68W30, 18A25, 18E10, 54E35

description: We redevelop persistent homology (topological persistence) from a categorical point of view. The main objects of study are diagrams, indexed by the poset of real numbers, in some target category. The set of such diagrams has an interleaving distance, which we show generalizes the previously-studied bottleneck distance. To illustrate the utility of this approach, we greatly generalize previous stability results for persistence, extended persistence, and kernel, image and cokernel persistence. We give a natural construction of a category of interleavings of these diagrams, and show that if the target category is abelian, so is this category of interleavings.
description: 27 pages, v3: minor changes, to appear in Discrete & Computational Geometry
A weak version of Rota's basis conjecture for odd dimensions
Creators: name: Aharoni, Ron
name: Kotlar, Daniel
Publisher: name: arXiv
Year: 2011
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: The Alon-Tarsi Latin square conjecture is extended to odd dimensions by stating it for reduced Latin squares (Latin squares having the identity permutation as their first row and first column). A modified version of Onn's colorful determinantal identity is used to show how the validity of this conjecture implies a weak version of Rota's basis conjecture for odd dimensions, namely that a set of $n$ bases in $\mathbb{R}^n$ has $n-1$ disjoint independent transversals.
Low Work Intensity in the Italian Regions in the Period 2004-2021
Creators: name: Leogrande, Angelo
Publisher: name: Zenodo
Year: 2023

description: Istat calculates the low work intensity in the Italian regions. The variable is defined as the percentage of people living in families for which the ratio between the total number of months worked by family members during the income reference year and the total number of months theoretically available for work activities is lower at 0.20. For the purposes of calculating this ratio, family members aged between 18 and 59 are considered, excluding students in the age range between 18 and 24. Families composed only of minors, students under the age of 25 and people aged 60 or over are not considered in the calculation of the indicator. The data refers to the period between 2004 and 2021 for the Italian regions and macro-regions.
On the equivalence between sharing quantum and classical secrets, and error correction
Creators: name: Marin, Anne
name: Markham, Damian
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a general scheme for sharing quantum secrets, and an extension to sharing classical secrets, which contain all known quantum secret sharing schemes. In this framework we show the equivalence of existence of both schemes, that is, the existence of a scheme sharing a quantum secret implies the extended classical secret sharing scheme works, and vice versa. As a consequence of this we find new schemes sharing classical secrets for arbitrary access structures. We then clarify the relationship to quantum error correction and observe several restrictions thereby imposed, which for example indicates that for pure state threshold schemes the share size $q$ must scale with the number of players $n$ as $q\geq \sqrt{n}$. These results also provide a new way of searching for quantum error correcting codes.
description: 7 pages, 2 figures, updated to journal version (improved discussions, and general proof of security for the RCQ protocol)
The basis problem for subspaces of monotonically normal compacta
Creators: name: Farhat, Ahmad
Publisher: name: arXiv
Year: 2012
Subjects: subject: General Topology (math.GN)
subject: FOS: Mathematics

description: We prove, assuming Souslin's Hypothesis, that each uncountable subspace of each zero-dimensional monotonically normal compact space contains an uncountable subset of the real line with either the metric, the Sorgenfrey, or the discrete topology.
description: 12 pages
Greedy and lazy representations in negative base systems
Creators: name: Hejda, Tomáš
name: Masáková, Zuzana
name: Pelantová, Edita
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 11A63 (Primary) 37B10 (Secondary)

description: We consider positional numeration systems with negative real base $-β$, where $β>1$, and study the extremal representations in these systems, called here the greedy and lazy representations. We give algorithms for determination of minimal and maximal $(-β)$-representation with respect to the alternate order. We also show that both extremal representations can be obtained as representations in the positive base $β^2$ and a non-integer alphabet. This enables us to characterize digit sequences admissible as greedy and lazy $(-β)$-representation. Such a characterization allows us to study the set of uniquely representable numbers. In case that $β$ is the golden ratio and the Tribonacci constant, we give the characterization of digit sequences admissible as greedy and lazy $(-β)$-representation using a set of forbidden strings.
description: 22 pages, 7 figures with 14 plots
Possibly New Charmed Baryon States from $\bar B^0\to p\bar p D^{0}$ Decay
Creators: name: Cheng, Hai-Yang
name: Geng, C. Q.
name: Hsiao, Y. K.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We examine the invariant mass spectrum of $D^{0}p$ in $\bar B^0\to p\bar p D^{0}$ decay measured by BABAR and find that through the 2-step processes of $\bar B^0\to {\bf B_c^+}(\to D^{0} p)\bar p$, where ${\bf B_c}$ denotes a charmed baryon state, some of the peaks can be identified with the established $Σ_c(2800)^+$, $Λ_c(2880)^+$ and $Λ_c(2940)^+$. Moreover, in order to account for the measured spectrum, it is necessary to introduce a new charmed baryon resonance with $(m,\,Γ)=(3212\pm 20,\,167\pm 34)$ MeV.
description: 8 pages, 1 figure, title changed and discussions updated, version accepted for publication in Phys. Rev. D
Soil corrosion behavior of hot-dipped galvanized steel in infrastructure applications
Creators: name: Padilla Perez, Victor Eduardo
Publisher: name: University of British Columbia
Year: 2014

description: Galvanized steel is one of the most common materials used in the construction industry for its relatively low cost paired with an acceptable corrosion resistance. Nevertheless, the early failure of a number of structures around the world that use galvanized steel has raised some controversy on the understanding of the corrosion behavior of zinc. This dissertation presents the results of several electrochemical studies and mathematical models done on zinc and galvanized steel as an attempt to fill in the gaps of current knowledge. Results indicate an increase on the corrosion rate with increasing amounts of Na₂SO₄, as well as a potential difference between samples in oxygen saturated, aerated, and de-aerated conditions is large enough to promote macrocell formation under aggresive conditions. The presence of sulphate in the soil significantly increased the corrosion rates and, thus, it is important to consider the effect of sulphate in determining the type of de-icing salt. In sulphate-free solutions, potassium acetate appeared to be the best option; while in the presence of sulphate, MgCl₂ and CaCl₂ had the lowest corrosion rate. The improved performance was attributed to the formation of a more evenly distributed corrosion product with better protective properties. Furthermore, when measuring corrosion at temperatures ranging from -5°C to 25°C, the rate observed at sub-zero temperatures is still higher than the rate acceptable for galvanized steel reinforced structures. SEM pictures show that the corrosion products grows preferentially in the vicinity of zinc grain boundaries and that it is apt to cracking with increasing thickness. A numerical model was developed to calculate the corrosion rate of galvanized steel in soil at three different stages of corrosion by considering key soil corrosion parameters. This thesis focuses on the effect of field conditions relevant to the Canadian climate on the corrosion performance of Mechanically Stabelized Earth (MSE) wall soil reinforcement and facings. Results indicate that the proposed model is suitable to be used for the service-life design and risk assessment of MSE walls and to determine the optimum zinc cover thickness.
Random walks in directed modular networks
Creators: name: Comin, Cesar H.
name: Viana, Matheus P.
name: Antiqueira, Lucas
name: Costa, Luciano da F.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Because diffusion typically involves symmetric interactions, scant attention has been focused on studying asymmetric cases. However, important networked systems underlain by diffusion (e.g. cortical networks and WWW) are inherently directed. In the case of undirected diffusion, it can be shown that the steady-state probability of the random walk dynamics is fully correlated with the degree, which no longer holds for directed networks. We investigate the relationship between such probability and the inward node degree, which we call efficiency, in modular networks. Our findings show that the efficiency of a given community depends mostly on the balance between its ingoing and outgoing connections. In addition, we derive analytical expressions to show that the internal degree of the nodes do not play a crucial role in their efficiency, when considering the Erdős-Rényi and Barabási-Albert models. The results are illustrated with respect to the macaque cortical network, providing subsidies for improving transportation and communication systems.
Novel synthetic derivatives of cinnamic and p-coumaric acids with antiproliferative effect on breast MCF-7 tumor cells
Creators: name: Rodrigues, Débora Munhoz
name: Portapilla, Gisele Bulhões
name: de Sicco, Gabriel Soubihe
name: da Silva, Iris Fraioli Reis
name: de Albuquerque, Sergio
name: Bastos, Jairo Kenupp
name: Campo, Vanessa Leiria
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Biotechnology
subject: Chemical Sciences not elsewhere classified
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Cancer
subject: Plant Biology
subject: FOS: Biological sciences

description: p-Coumaric acid is derived from cinnamic acid and is one of the major compounds in the Brazilian green propolis extract. Studies have shown that both p-coumaric acid and cinnamic acid have promising antiproliferative effects. In this context, aiming to increase the complexity of these active natural products and their activities, we performed coupling reactions with propargylamine and benzylamine, as well as with threonine, phenylalanine and lysine amino acids, aiming to enhance their antiproliferative effects towards the hormone-dependent breast cancer MCF-7 cells. Overall, the p-coumaric acid coupling with L-threonine amino acid (compound 15) had the best selectivity index (SI = 5.1), with half-maximal inhibitory concentration of 39.6 ± 1 μM, showing a high selectivity against hormone-dependent breast cancer cell lines MCF-7 and low cytotoxicity against the normal breast cell lines MCF-10A. Thus, this new natural product derivative may represent a prototype for the future development of antiproliferative agents, especially against hormone-dependent breast cancer.
Quotient closed subcategories of quiver representations
Creators: name: Oppermann, Steffen
name: Reiten, Idun
name: Thomas, Hugh
Publisher: name: arXiv
Year: 2012
Subjects: subject: Representation Theory (math.RT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 16G20, 16G70, 05E10

description: Let Q be a finite quiver without oriented cycles, and let k be an algebraically closed field. The main result in this paper is that there is a natural bijection between the elements in the associated Coxeter group W_Q and the cofinite additive quotient-closed subcategories of the category of finite dimensional right modules over kQ. We prove this correspondence by linking these subcategories to certain ideals in the preprojective algebra associated to Q, which are also indexed by elements of W_Q.
description: 35 pages; v2: added a section showing how the Le-diagram condition arises naturally from our viewpoint; v3: treat the case of hereditary algebras over a finite field
Deliberation in anarchy
Creators: name: Tomm, Jonathan Michael
Publisher: name: University of British Columbia
Year: 2014

description: How do cooperative rules and agreements emerge in anarchical situations of political conflict between or within states? This dissertation responds to this question by developing an innovative theory of the role that deliberation plays in the emergence of rule-based cooperation under anarchy. “Deliberation” refers to a kind of political talk in which participants attempt to persuade each other on the basis of convincing reasons. Deliberation promises to be an important vehicle through which political opponents make and follow cooperative rules together. The problem, however, is that because deliberation has primarily been studied in the context of strong, liberal-democratic states, we do not yet have an adequate understanding of how it can be effective under more anarchical conditions. Without the security provided by strong institutions and relatively thick “lifeworlds” of shared culture and norms, deliberative responses to politics are more likely to be scuttled by mistrust and mutual suspicion. The theory developed here addresses this challenge by highlighting and investigating the often-overlooked relational effects of deliberation. Deliberation is not just about the content of the reasons political opponents offer one another. It is also about the fact that they are offering reasons at all, and about what that implies for the kind of actions they can expect from each other. Most importantly, deliberation can be a way for interlocutors to demonstrate their accountability to each other: their willingness to uphold, and count on others to uphold, shared standards of behaviour. In this way deliberation can help to generate the bonds of trust and mutually acknowledged commitment that political opponents need in order to act on shared rules and understandings. In developing this theory, the dissertation offers new conceptual tools for understanding how productive politics, based on negotiation, persuasion, and shared rules, can get a toehold even under difficult conditions.
Additional file 1 of Randomized boosting with multivariable base-learners for high-dimensional variable selection and prediction
Creators: name: Staerk, Christian
name: Mayr, Andreas
Publisher: name: figshare
Year: 2021
Subjects: subject: Statistics
subject: FOS: Mathematics
subject: Artificial Intelligence and Image Processing
subject: FOS: Computer and information sciences

description: Additional file 1. The Supplement includes results for an illustrative low-dimensional data example as well as additional results for the simulation study and the biomedical data applications.