cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Lévy-Khintchine type operators with variable Lipschitz continuous coefficients generate linear or nonlinear Markov processes and semigroups
Creators: name: Kolokoltsov, Vassili N.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J27, 60H10, 35S10

description: Ito's construction of Markovian solutions to stochastic equations driven by a Lévy noise is extended to nonlinear distribution dependent integrands aiming at the effective construction of linear and nonlinear Markov semigroups and the corresponding processes with a given pseudo-differential generator. It is shown that a conditionally positive integro-differential operator (of the Lévy-Khintchine type) with variable coefficients (diffusion, drift and Lévy measure) depending Lipschitz continuously on its parameters (position and/or its distribution) generates a linear or nonlinear Markov semigroup, where the measures are metricized by the Wasserstein-Kantorovich metrics. This is a nontrivial but natural extension to general Markov processes of a long known fact for ordinary diffusions.
Stochastic monotonicity and duality for one-dimensional Markov processes
Creators: name: Kolokoltsov, Vassili
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: The theory of monotonicity and duality is developed for general one-dimensional Feller processes. Moreover it is shown that local monotonicity conditions (conditions on the Lévy kernel) are sufficient to prove the well-posedness of the corresponding Markov semigroup and process, including unbounded coefficients and processes on the half-line.
description: Revised version corrects typos, adds references and a new related result
Nonlinear Lévy and nonlinear Feller processes: an analytic introduction
Creators: name: Kolokoltsov, Vassili N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Probability (math.PR)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics

description: The program of studying general nonlinear Markov processes was put forward in V. N. Kolokoltsov "Nonlinear Markov Semigroups and Interacting Lévy Type Processes" (Journ. Stat. Physics 126:3 (2007), 585-642), and was developed by the author in monograph "Nonlinear Markov processes and kinetic equations". Cambridge University Press, 2010, where, in particular, nonlinear Lévy processes were introduced. The present paper is an invitation to the rapidly developing topic of noninear Markov processes. We provide a quick (and at the same time more abstract) introduction to the basic analytical aspects of the theory developed in Part II of the above mentioned book.
description: 20 pages
Game theoretic analysis of incomplete markets: emergence of probabilities, nonlinear and fractional Black-Scholes equations
Creators: name: Kolokoltsov, Vassili
Publisher: name: arXiv
Year: 2011
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 91G20, 91B25, 90C47, 52A20, 60G22

description: Expanding the ideas of the author's paper 'Nonexpansive maps and option pricing theory' (Kibernetica 34:6 (1998), 713-724) we develop a pure game-theoretic approach to option pricing, by-passing stochastic modeling. Risk neutral probabilities emerge automatically from the robust control evaluation. This approach seems to be especially appealing for incomplete markets encompassing extensive, so to say untamed, randomness, when the coexistence of infinite number of risk neutral measures precludes one from unified pricing of derivative securities. Our method is robust enough to be able to accommodate various markets rules and settings including path dependent payoffs, American options and transaction costs. On the other hand, it leads to rather simple numerical algorithms. Continuous time limit is described by nonlinear and/or fractional Black-Scholes type equations.
description: 42 pages
Health managers in B.C., part 1 : methods and preliminary findings from survey of chief executive officers
Creators: name: Kazanjian, Arminée, 1947-
name: Pagliccia, N.
name: Jackson, C.
Publisher: name: Health Human Resources Unit (HHRU); Health Manpower Research Unit
Year: 2014

description: In this report we present in detail the research methods and the results of the first part of a two-stage mail survey designed to describe the current supply of Health Managers in British Columbia. To date, a comprehensive profile of this group, or even a consensus of who they are and what they do, does not exist in B.C. or elsewhere in Canada.
Nonlinear diffusions and stable-like processes with coefficients depending on the median or VaR
Creators: name: Kolokoltsov, Vassili N.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: In June 2012 on a conference in Bielefeld, after the author made the presentation of his theory of nonlinear Markov processes, Tom Kurtz asked him whether his methods would allow to get well-posedness for nonlinear McKean-Vlasov type diffusions with coefficients depending on the distribution via the median. The present paper is the answer to this question. The aim here is not to find the weakest possible conditions for the affirmative answer, but a sensible general result with a quick and transparent proof.
Stochastic duality of Markov processes: a study via generators
Creators: name: Kolokoltsov, Vassili
name: Lee, RuiXin
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: The paper is devoted to a systematic study of the duality of processes in the sense that $E f(X_t^x,y)=E f (x, Y_t^y)$ for a certain $f$. This classical topic has well known applications in interacting particles, intertwining, superprocesses, stochastic monotonicity, exit - entrance laws, ruin probabilities in finances, etc. Aiming mostly at the case of $f$ depending on the difference of its arguments, we shall give a systematic study of duality via the analysis of the generators of dual Markov processes leading to various results and insights.
MPEC 2024-F121 : 2024 ED6
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 ED6

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
A kinematic study of energy barriers to crack formation in graphene tilt boundaries
Creators: name: Daly, Matthew
name: Singh, Chandra Veer
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Recent experimental studies have observed a surprisingly wide range of strengths in polycrystalline graphene. Previous computational investigations of graphene tilt boundaries have highlighted the role of interfacial topology in determining mechanical properties. However, a rigorous characterization of deformation energy barriers is lacking, which precludes direct comparison to the available experimental data. In the current study, molecular dynamics tensile studies are performed to quantify kinematic effects on failure initiation in a wide range of graphene tilt boundaries. Specifically, the process of crack formation is investigated to provide a conservative estimate of strength at experimental loading rates. Contrary to previous studies, significant strain rate sensitivity is observed, resulting in reductions of crack formation stresses on the order of 7 to 33%. Activation energies of crack formation are calculated in the range of 0.58 to 2.07 eV based on an Arrhenius relation that is fit to the collected simulation data. Physically, the magnitude of activation energies in graphene tilt boundaries are found to be linearly correlated to the pre-stress found at the critical bonds in graphene tilt boundaries. Predictions reported in the present study provide a possible explanation for the wide range of strengths experimentally observed in polycrystalline graphene and greatly improve upon current theoretical estimates.
description: 13 pages and 8 figures with supplement. Missing jpg figures are appended as supplemental info for download at arXiv:1404.2210v1 Update: Added citation for Journal paper
Stochastic monotonicity and duality of $k$th order with application to put-call symmetry of powered options
Creators: name: Kolokoltsov, Vassili
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J25

description: We introduce a notion of $k$th order stochastic monotonicity and duality that allows one to unify the notion used in insurance mathematics (sometimes refereed to as Siegmund's duality) for the study of ruin probability and the duality responsible for the so-called put - call symmetries in option pricing. Our general $k$th order duality can be financially interpreted as put - call symmetry for powered options. The main objective of the present paper is to develop an effective analytic approach to the analysis of duality leading to the full characterization of $k$th order duality of Markov processes in terms of their generators, which is new even for the well-studied case of put -call symmetries.
description: To appear in Journal of Applied Probability 52:1 (March 2015)
CHALLENGES IN TEACHING ENGLISH AS A SECOND LANGUAGE TO YOUNG LEARNERS
Creators: name: Baymuradova, Dildora
Publisher: name: Zenodo
Year: 2024

description: This comprehensive thesis is written on the challenges of teaching English to young learners. The article highlights the lack of qualified English as a second language teachers, deficiencies in educational resources, and differences in language grammar. The thesis covers best practices such as CLT, TBLT, CBI and technology-enhanced learning.
The evolutionary game of pressure (or interference), resistance and collaboration
Creators: name: Kolokoltsov, Vassili
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 91A22, 91A80, 91F99, 60J20

description: In this paper we extend the framework of evolutionary inspection game put forward recently by the author and coworkers to a large class of conflict interactions dealing with the pressure executed by the major player (or principal) on the large group of small players that can resist this pressure or collaborate with the major player. We prove rigorous results on the convergence of various Markov decision models of interacting small agents (including evolutionary growth), namely pairwise, in groups and by coalition formation, to a deterministic evolution on the distributions of the state spaces of small players paying main attention to situations with an infinite state-space of small players. We supply rather precise rates of convergence. The theoretical results of the paper are applied to the analysis of the processes of inspection, corruption, cyber-security, counter-terrorism, banks and firms merging, strategically enhanced preferential attachment and many other.
Why C.K. Stead didn't like Keri Hulme's the bone people: Who can write as Other?
Creators: name: Fee, Margery
Publisher: name: Australian and New Zealand Studies in Canada
Year: 2009

description: Stead argues that Hulme, with only one Maori great-grandparent, is not Maori enough to win a literary prize for Maori writing. The paper examines various means for dealing with the vexed question of how to judge whether someone of mixed ancestry can identify with the part of that ancestry that is a minority without risking appropriation of that culture. Hulme and the controversies surrounding her identity and her novel provide a useful focus.
A GIS-Based Quantitative Model for Land Use Planning in Larestan County, Iran
Creators: name: Masoudi, Masoud
name: Jokar, Parviz
name: Ramezanipour, Elias
Publisher: name: EQA - International Journal of Environmental Quality
Year: 2020
Subjects: boolean theory; land-use planning; modified model; GIS; Larestan County

description: Land use planning involves making decisions regarding the use of land resources with the primary aim of achieving the best use of land for maximum food production and profit. The main goal of this research is to evaluate the land use and natural resources for future sustainable land planning using GIS. So, in this study, the Iranian ecological evaluation model was used for the analysis the ecological and resources maps of the study area. First of all, ecological capability maps of different land uses including forestry, agriculture, range management, environmental conservation, ecotourism and development of village, urban and industry were developed by overlaying geographical maps based on Boolean overlay method (as a Multi-Criteria Evaluation Method) in GIS for the Township. The final step of this research was the prioritization of land uses considering the ecological and socio-economic characteristics (by distributing questionnaire to 46 experts (of the study area using a quantitative model. Results shows the maximum area of proposed uses is 65.1% that is related to range management showing this land use has high potential and socio-economic demands in study area. While minimum area of proposed uses is related to Rainfed farming.
description: EQA - International Journal of Environmental Quality, Vol 40 (2020)
On fully mixed and multidimensional extensions of the Caputo and Riemann-Liouville derivatives, related Markov processes and fractional differential equations
Creators: name: Kolokoltsov, Vassili
Publisher: name: arXiv
Year: 2015
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 34A08, 35S15, 60J50, 60J75

description: From the point of view of stochastic analysis the Caputo and Riemann-Liouville derivatives of order $\al \in (0,2)$ can be viewed as (regularized) generators of stable Lévy motions interrupted on crossing a boundary. This interpretation naturally suggests fully mixed, two-sided or even multidimensional generalizations of these derivatives, as well as a probabilistic approach to the analysis of the related equations. These extensions are introduced and some well-posedness results are obtained that generalize, simplify and unify lots of known facts. This probabilistic analysis leads one to study a class of Markov processes that can be constructed from any given Markov process in $\R^d$ by blocking (or interrupting) the jumps that attempt to cross certain closed set of 'check-points'.
description: Submitted to Fract. Calc. Appl. Anal
The infrared dielectric function of solid para-hydrogen
Creators: name: Kettwich, Cassie
name: Anderson, David
name: Walker, Mark
name: Tuntsov, Artem
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report laboratory measurements of the absorption coefficient of solid para-H2, within the wavelength range from 1 to 16.7 micron, at high spectral resolution. In addition to the narrow rovibrational lines of H2 which are familiar from gas phase spectroscopy, the data manifest double transitions and broad phonon branches that are characteristic specifically of hydrogen in the solid phase. These transitions are of interest because they provide a spectral signature which is independent of the impurity content of the matrix. We have used our data, in combination with a model of the ultraviolet absorptions of the H2 molecule, to construct the dielectric function of solid para-H2 over a broad range of frequencies. Our results will be useful in determining the electromagnetic response of small particles of solid hydrogen. The dielectric function makes it clear that pure H2 dust would contribute to IR extinction predominantly by scattering starlight, rather than absorbing it, and the characteristic IR absorption spectrum of the hydrogen matrix itself will be difficult to observe.
description: MNRAS (Accepted); 11 pages, 4 figures; Tables available on www.manlyastrophysics.org
Surgical considerations in the resection of solitary fibrous tumors of the pleura
Creators: name: Ajouz, Hana
name: Sohail, Amir H.
name: Hasmi, Hassan
name: Aguilar, Myriam Martinez
name: Daoui, Sabrina
name: Tembelis, Miltiadis
name: Aziz, Muhammad
name: Zohourian, Tirajeh
name: Brathwaite, Collin E. M.
name: Cefolio, Robert J.
Publisher: name: PRIME
Year: 2024
Subjects: classificationCode: 320226
subject: Surgery

description: Abstract: Solitary fibrous tumors (SFTs) are rare mesenchymal pleural neoplasms with an overall good prognosis and low recurrence rate if completely resected and if degree of differentiation is favorable. Within the last decade, advances in research have led to more reliable methods of differentiating SFTs from other soft tissue tumors. Historically, several markers were used to distinguish SFTs from similar tumors, but these markers had poor specificity. Recent evidence showed NAB2-STAT6 fusion gene to be a distinct feature of SFTs with 100% specificity and sensitivity. Surgical resection, with an emphasis on obtaining negative margins, is the mainstay of treatment for SFTs. Preoperative planning with detailed imaging is imperative to delineate the extent of disease and vascular supply. One important radiologic distinction to aid delineation of a pleural-based tumor compared to a pulmonary parenchymal-based tumor is the angle that the tumor forms with the chest wall, which is obtuse for a pleural-based tumor, and acute for tumors of the lung parenchyma. Often, preoperative tissue diagnosis is not available, and surgery is both diagnostic and curative. Intraoperatively, emphasis should be on complete resection with negative margins. SFTs are resected via several approaches: thoracotomy, sternotomy with the option of hemi-clamshell extension, video-assisted thoracoscopic surgery, and robotic approach, which is increasingly being used and is our preference. We recommend a minimally invasive approach for most lesions, and have resected SFTs of the pleura that are up to 12 cm with the robotic approach. However, the current literature often cites 5 cm as the cut off for an open thoracotomy. Nevertheless, even with larger tumors, a minimally invasive robotic approach is our preference and practice. For giant SFTs (> 20 cm), an open approach may be preferable. Multiple thoracotomies and rib resection may be required to gain adequate exposure and ensure complete resection in these tumors. However, it is noteworthy that most of these tumors have a soft consistency and thus, once bagged, can easily be removed minimally invasively, and thus minimally invasive approach should not be completely ruled out. Recurrence in SFTs usually results from incomplete resection and redo surgery may portend a favorable prognosis.
Trobos para cantar los aficionados: Digital edition
Creators: name: Leblanc Elina
Publisher: name: Zenodo
Year: 2024
Subjects: Spanish literature
Digital edition
XML-TEI

description: Digital edition of a Spanish pliego de cordel, published by the Andalusian printer José María Moreno (19th c.). It contains the XML-TEI file of the edition, as well as the files that led to this edition, i.e. the digital facsimiles (raw and retouched), and the transcription produced by the OCR tool Transkribus (PAGE-XML). This digital edition is a part of the research project Desenrollando el cordel / Untangling the cordel / Démêler le cordel (2020-2024), led by professor Constance Carta at the University of Geneva and supported by the philanthropic Sandoz-Monique de Meuron Family Foundation.
Mean field game model of corruption
Creators: name: Kolokoltsov, Vassili N.
name: Malafeyev, Oleg A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 91A06, 91A15, 91A40, 91F99

description: A simple model of corruption that takes into account the effect of the interaction of a large number of agents by both rational decision making and myopic behavior is developed. Its stationary version turns out to be a rare example of an exactly solvable model of mean-field-game type. The results show clearly how the presence of interaction (including social norms) influences the spread of corruption.
Investigation of physico-chemical Characteristics and Heavy Metals Concentration Implying to the Effect of Local Geology on Surface Water Quality of Werii Catchment, Tigray, Ethiopia
Creators: name: Haftu, Zelealem
name: Estifanos, Samuel
Publisher: name: EQA - International Journal of Environmental Quality
Year: 2020
Subjects: Heavy-metals; Surface water quality; Factor analysis; Lithounits

description: The paper assesses the water quality parameters of Werii catchment in Northern Ethiopia. 27 water samples were collected and analyzed for 17 physico-chemical parameters. The electrical conductivity ranges 128-627μS/cm, while turbidity: 20-36.23NTU; total dissolved solids: 140.5-389 mg/L, and total alkalinity: 105-510 mg/L. The proportion of the samples exceeding WHO guidelines for drinking purposes in increasing order are Cu (16%), Cr (40%), As (44%), Ni (54%), Pb (64%), Fe (76%), Co (80%) and Zn (100%). One-sample testing confirmed that all but Fe significantly exceed the WHO guidelines values. The result of both One-way ANOVA and Factor analyses revealed Cr, Zn, Cu and Turbidity are associated with Werii slates in the first of five factors. Fe, As, Ni and Co are associated with Tsedia Slate in the second factor. The rest factors indicated that EC, TS, TSS and Co are attributed to Aiba basalt, Adigrat sandstone, Werii Slates and Tsedia Slates respectively.
description: EQA - International Journal of Environmental Quality, Vol 40 (2020)
Trobos para cantar los aficionados: Digital edition
Creators: name: Leblanc Elina
Publisher: name: Zenodo
Year: 2021
Subjects: Spanish literature
Digital edition
XML-TEI

description: Digital edition of a Spanish pliego de cordel, published by the Andalusian printer José María Moreno (19th c.). It contains the XML-TEI file of the edition, as well as the files that led to this edition, i.e. the digital facsimiles (raw and retouched), and the transcription produced by the OCR tool Transkribus (PAGE-XML). This digital edition is a part of the research project Desenrollando el cordel / Untangling the cordel / Démêler le cordel (2020-2022), led by the professor Constance Carta at the University of Geneva and supported by the philanthropic Sandoz-Monique de Meuron Family Foundation.
Stable organic carbon pool rises in soil under chestnut (Castanea sativa Mill.) forest for timber production after 15 years since grafting onto satin-cut stumps
Creators: name: De Feudis, Mauro
name: Falsone, Gloria
name: Vianello, Gilmo
name: Vittori Antisari, Livia
Publisher: name: EQA - International Journal of Environmental Quality
Year: 2020
Subjects: chestnut forest; soil organic carbon; organic matter pools; forest restoration; mountain soil

description: Forest soils represent an important terrestrial organic carbon sink and the management practices could affect this C pool. The purpose of the present study was to investigate the effect of a forest restoration on the quantity and quality of the soil organic C (SOC). Since the widespread distribution of European chestnut (Castanea sativa Mill.) trees in European temperate forests, a 15 years old chestnut forest for timber production was selected on Northern Apennine chain (Italy) which was established on a clear–cut old chestnut stand. The soil sampling was performed in November 2004 (t0, before grafting), 2008 (t1) and 2019 (t2) through the digging of minipits down to 10 – 30 cm. In each minipit the surface and subsurface horizons were sampled and analysed for the determination of the total organic C content (TOC), and the C of fulvic acids (FA–C), humic acids (HA–C), humin (humin–C) and non–humic substances. Then, the total organic C stock (OCstock), the humification index (HI) and the humification rate (HR) were calculated. From t0 to t2 the mean thickness of subsurface horizon increased likely due both to the tree roots development and to the increased canopy cover due to tree growth which probably reduced the soil erosion. Generally, both TOC content and OCstock did not change over time. The FA–C and HA–C concentrations, instead, more sensitive to the change of management practises, generally reduced over time. This trend was also confirmed by the decline of HR. The humin–C content increased indicating an accumulation of the most recalcitrant SOC pool over time. Hence, the restoration of chestnut stands in mountainous areas, beyond to be a valid economic practice, has beneficial effects on the soil capacity to storage stable C.
description: EQA - International Journal of Environmental Quality, Vol 40 (2020)
Trobos para cantar los aficionados: Digital edition
Creators: name: Leblanc Elina
Publisher: name: Zenodo
Year: 2022
Subjects: Spanish literature
Digital edition
XML-TEI

description: Digital edition of a Spanish pliego de cordel, published by the Andalusian printer José María Moreno (19th c.). It contains the XML-TEI file of the edition, as well as the files that led to this edition, i.e. the digital facsimiles (raw and retouched), and the transcription produced by the OCR tool Transkribus (PAGE-XML). This digital edition is a part of the research project Desenrollando el cordel / Untangling the cordel / Démêler le cordel (2020-2024), led by the professor Constance Carta at the University of Geneva and supported by the philanthropic Sandoz-Monique de Meuron Family Foundation.
On the use of reproducing kernel Hilbert spaces in functional classification
Creators: name: Berrendero, José R.
name: Cuevas, Antonio
name: Torrecilla, José L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Methodology (stat.ME)
subject: Statistics Theory (math.ST)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: The Hájek-Feldman dichotomy establishes that two Gaussian measures are either mutually absolutely continuous with respect to each other (and hence there is a Radon-Nikodym density for each measure with respect to the other one) or mutually singular. Unlike the case of finite dimensional Gaussian measures, there are non-trivial examples of both situations when dealing with Gaussian stochastic processes. This paper provides: (a) Explicit expressions for the optimal (Bayes) rule and the minimal classification error probability in several relevant problems of supervised binary classification of mutually absolutely continuous Gaussian processes. The approach relies on some classical results in the theory of Reproducing Kernel Hilbert Spaces (RKHS). (b) An interpretation, in terms of mutual singularity, for the "near perfect classification" phenomenon described by Delaigle and Hall (2012). We show that the asymptotically optimal rule proposed by these authors can be identified with the sequence of optimal rules for an approximating sequence of classification problems in the absolutely continuous case. (c) A new model-based method for variable selection in binary classification problems, which arises in a very natural way from the explicit knowledge of the RN-derivatives and the underlying RKHS structure. Different classifiers might be used from the selected variables. In particular, the classical, linear finite-dimensional Fisher rule turns out to be consistent under some standard conditions on the underlying functional model.
Nurse deployment patterns : examples for health human resource management
Creators: name: Kazanjian, Arminée, 1947-
name: Pulcins, I.
name: Kerluke, K.
Publisher: name: Health Human Resources Unit (HHRU); Health Manpower Research Unit
Year: 2014

description: The purpose of this paper is to demonstrate that to invest in the "front end" of the management process is the best approach to this problem. Preventing human resource problems by optimizing regular staff deployment is more cost-effective than reacting repeatedly to shortages of qualified personnel through casual staffing. The thrust of the analysis is to examine and describe the staffing requirements of various patterns of nurse deployment and to develop a management model for maximizing current staff resources. In addition, this report provides information on ways to enhance the management of nursing resources through the systematic monitoring of personnel retention.
On the Strong Chromatic Index of Sparse Graphs
Creators: name: DeOrsey, Philip
name: Diemunsch, Jennifer
name: Ferrara, Michael
name: Graber, Nathan
name: Hartke, Stephen G.
name: Jahanbekam, Sogol
name: Lidicky, Bernard
name: Nelsen, Luke L.
name: Stolee, Derrick
name: Sullivan, Eric
Publisher: name: arXiv
Year: 2015
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C15

description: The strong chromatic index of a graph $G$, denoted $χ_s'(G)$, is the least number of colors needed to edge-color $G$ so that edges at distance at most two receive distinct colors. The strong list chromatic index, denoted $χ_{s,\ell}'(G)$, is the least integer $k$ such that if arbitrary lists of size $k$ are assigned to each edge then $G$ can be edge-colored from those lists where edges at distance at most two receive distinct colors. We use the discharging method, the Combinatorial Nullstellensatz, and computation to show that if $G$ is a subcubic planar graph with $\operatorname{girth}(G) \geq 41$ then $χ_{s,\ell}'(G) \leq 5$, answering a question of Borodin and Ivanova [Precise upper bound for the strong edge chromatic number of sparse planar graphs, Discuss. Math. Graph Theory, 33(4), (2014) 759--770]. We further show that if $G$ is a subcubic planar graph and $\operatorname{girth}(G) \geq 30$, then $χ_s'(G) \leq 5$, improving a bound from the same paper. Finally, if $G$ is a planar graph with maximum degree at most four and $\operatorname{girth}(G) \geq 28$, then $χ_s'(G) \leq 7$, improving a more general bound of Wang and Zhao from [Odd graphs and its application on the strong edge coloring, arXiv:1412.8358] in this case.
description: 15 pages, 10 figures
Mean-field-game model for Botnet defense in Cyber-security
Creators: name: Kolokoltsov, Vassili
name: Bensoussan, Alain
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 91A80, 93E20, 91A13

description: We initiate the analysis of the response of computer owners to various offers of defence systems against a cyber-hacker (for instance, a botnet attack), as a stochastic game of a large number of interacting agents. We introduce a simple mean-field game that models their behavior. It takes into account both the random process of the propagation of the infection (controlled by the botner herder) and the decision making process of customers. Its stationary version turns out to be exactly solvable (but not at all trivial) under an additional natural assumption that the execution time of the decisions of the customers (say, switch on or out the defence system) is much faster that the infection rates.
Enhancement of Crosswind Pollutant Dispersion by Steadily Veering Winds in Sea Breezes.
Creators: name: Steyn, Douw G.
name: Segal, M.
Publisher: name: American Meteorological Society
Year: 2011

description: An estimate is given of the relative importance of wind veering and turbulent diffusion in the mean horizontal spread of pollutant plumes in the atmosphere. Documented veering rates in sea breezes are used to illustrate the effect, and it is concluded that for typical sea breeze induced veering, the effect will be significant over much of the range of applicability of the Gaussian plume model. Copyright 1990 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyright@ametsoc.org.
MPEC 2025-H29 : 2025 FK28
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2025 FK28

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Recent Advances in the Theory and Simulation of Model Colloidal Microphase Formers
Creators: name: Zhuang, Yuan
name: Charbonneau, Patrick
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: This mini-review synthesizes our understanding of the equilibrium behavior of particle models with short-range attractive and long-range repulsive (SALR) interactions. These models, which can form stable periodic microphases, aim to reproduce the essence of colloidal suspensions with competing interactions. Ordered structures, however, have yet to be obtained in experiments. In order to better understand the hurdles to periodic microphase assembly, marked theoretical and simulation advances have been made over the last few years. Here, we present recent progress in the study of microphases in models with SALR interactions using liquid-state theory and density-functional theory as well as numerical simulations. Combining these various approaches provides a description of periodic microphases, and give insights into the rich phenomenology of the surrounding disordered regime. Three additional ongoing research directions in the thermodynamics of models with SALR interactions are also presented.
Corruption and botnet defense: a mean field game approach
Creators: name: Kolokoltsov, Vassili N.
name: Malafeyev, Oleg A.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics
subject: 91A06

description: Recently developed toy models for the mean-field games of corruption and botnet defence in cyber-security with three or four states of agents are extended to a more general mean-field-game model with $2d$ states, $d\in \N$. In order to tackle new technical difficulties arising from a larger state-space we introduce new asymptotic regimes, namely small discount and small interaction asymptotics. Moreover, the link between stationary and time-dependent solutions is established rigorously leading to a performance of the turnpike theory in a mean-field-game setting.
Ore and Chvátal-type Degree Conditions for Bootstrap Percolation from Small Sets
Creators: name: Dairyko, Michael
name: Ferrara, Michael
name: Lidický, Bernard
name: Martin, Ryan R.
name: Pfender, Florian
name: Uzzell, Andrew J.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C35

description: Bootstrap percolation is a deterministic cellular automaton in which vertices of a graph~$G$ begin in one of two states, "dormant" or "active". Given a fixed integer $r$, a dormant vertex becomes active if at any stage it has at least $r$ active neighbors, and it remains active for the duration of the process. Given an initial set of active vertices $A$, we say that $G$ $r$-percolates (from $A$) if every vertex in $G$ becomes active after some number of steps. Let $m(G,r)$ denote the minimum size of a set $A$ such that $G$ $r$-percolates from $A$. Bootstrap percolation has been studied in a number of settings, and has applications to both statistical physics and discrete epidemiology. Here, we are concerned with degree-based density conditions that ensure $m(G,2)=2$. In particular, we give an Ore-type degree sum result that states that if a graph $G$ satisfies $σ_2(G)\ge n-2$, then either $m(G,2)=2$ or $G$ is in one of a small number of classes of exceptional graphs. We also give a Chvátal-type degree condition: If $G$ is a graph with degree sequence $d_1\le d_2\le\dots\le d_n$ such that $d_i \geq i+1$ or $d_{n-i} \geq n-i-1$ for all $1 \leq i < \frac{n}{2}$, then $m(G,2)=2$ or $G$ falls into one of several specific exceptional classes of graphs. Both of these results are inspired by, and extend, an Ore-type result in [D. Freund, M. Poloczek, and D. Reichman, Contagious sets in dense graphs, to appear in European J. Combin.]
description: 15 pages, 3 figures
Assembly of hard spheres in a cylinder: a computational and experimental study
Creators: name: Fu, Lin
name: Bian, Ce
name: Shields, C. Wyatt
name: Cruz, Daniela F.
name: López, Gabriel P.
name: Charbonneau, Patrick
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Hard spheres are an important benchmark of our understanding of natural and synthetic systems. In this work, colloidal experiments and Monte Carlo simulations examine the equilibrium and out-of-equilibrium assembly of hard spheres of diameter $σ$ within cylinders of diameter $σ\leq D\leq 2.82σ$. Although in such a system phase transitions formally do not exist, marked structural crossovers are observed. In simulations, we find that the resulting pressure-diameter structural diagram echoes the densest packing sequence obtained at infinite pressure in this range of $D$. We also observe that the out-of-equilibrium self-assembly depends on the compression rate. Slow compression approximates equilibrium results, while fast compression can skip intermediate structures. Crossovers for which no continuous line-slip exists are found to be dynamically unfavorable, which is the source of this difference. Results from colloidal sedimentation experiments at high Péclet number are found to be consistent with the results of fast compressions, as long as appropriate boundary conditions are used. The similitude between compression and sedimentation results suggests that the assembly pathway does not here sensitively depend on the nature of the out-of-equilibrium dynamics.
description: 11 pages, 8 figures and 63 references
Phase diagram and aggregation dynamics of a monolayer of paramagnetic colloids
Creators: name: Pham, An T.
name: Zhuang, Yuan
name: Detwiler, Paige
name: Socolar, Joshua E. S.
name: Charbonneau, Patrick
name: Yellen, Benjamin B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We have developed a tunable colloidal system and a corresponding simulation model for studying the phase behavior of particles assembling under the influence of long-range magnetic interactions. A monolayer of paramagnetic particles is subjected to a spatially uniform magnetic field with a static perpendicular component and rapidly rotating in-plane component. The sign and strength of the interactions vary with the tilt angle $θ$ of the rotating magnetic field. For a purely in-plane field, $θ=90^{\circ}$, interactions are attractive and the experimental results agree well with both equilibrium and out-of-equilibrium predictions based on a two-body interaction model. For tilt angles $50^{\circ}\lesssim θ\lesssim 55^{\circ}$, the two-body interaction gives a short-range attractive and long-range repulsive (SALR) interaction, which predicts the formation of equilibrium microphases. In experiments, however, a different type of assembly is observed. Inclusion of three-body (and higher-order) terms in the model does not resolve the discrepancy. We thus further characterize the anomalous behavior by measuring the time-dependent cluster size distribution.
description: 12 pages, 8 figures
Semidefinite Programming and Ramsey Numbers
Creators: name: Lidický, Bernard
name: Pfender, Florian
Publisher: name: arXiv
Year: 2017
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: Finding exact Ramsey numbers is a problem typically restricted to relatively small graphs. The flag algebra method was developed to find asymptotic results for very large graphs, so it seems that the method is not suitable for finding small Ramsey numbers. But this intuition is wrong, and we will develop a technique to do just that in this paper. We find new upper bounds for many small graph and hypergraph Ramsey numbers. As a result, we prove the exact values $R(K_4^-,K_4^-,K_4^-)=28$, $R(K_8,C_5)= 29$, $R(K_9,C_6)= 41$, $R(Q_3,Q_3)=13$, $R(K_{3,5},K_{1,6})=17$, $R(C_3, C_5, C_5)= 17$, and $R(K_4^-,K_5^-;3)= 12$. We hope that this technique will be adapted to address other questions for smaller graphs with the flag algebra method.
description: 17 pages, 2 figures
Technology diffusion : the troll under the bridge : a pilot study of low and highhealth technology in British Columbia
Creators: name: Kazanjian, Arminée, 1947-
name: Friesen, K
Publisher: name: Centre for Health Services and Policy Research (CHSPR)
Year: 2014

description: This study set out to compile a classificatory scheme for examining technology in health care, and to generate hypotheses regarding patterns of diffusion and utilization in British Columbia. Specifically, the two objectives of the pilot study were: i) To develop from the literature on technology assessment a taxonomy for classifying technology in health care; and ii) to examine the empirical evidence on the diffusion and utilization of two diagnostic technologies - CT scanners and Automated Lab Tests selected specifically for their apparent dissimilitude on a number of dimensions such as cost, volume, and type of innovation.
Information Leakage Games
Creators: name: Alvim, Mário S.
name: Chatzikokolakis, Konstantinos
name: Kawamoto, Yusuke
name: Palamidessi, Catuscia
Publisher: name: arXiv
Year: 2017
Subjects: subject: Cryptography and Security (cs.CR)
subject: Computer Science and Game Theory (cs.GT)
subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: We consider a game-theoretic setting to model the interplay between attacker and defender in the context of information flow, and to reason about their optimal strategies. In contrast with standard game theory, in our games the utility of a mixed strategy is a convex function of the distribution on the defender's pure actions, rather than the expected value of their utilities. Nevertheless, the important properties of game theory, notably the existence of a Nash equilibrium, still hold for our (zero-sum) leakage games, and we provide algorithms to compute the corresponding optimal strategies. As typical in (simultaneous) game theory, the optimal strategy is usually mixed, i.e., probabilistic, for both the attacker and the defender. From the point of view of information flow, this was to be expected in the case of the defender, since it is well known that randomization at the level of the system design may help to reduce information leaks. Regarding the attacker, however, this seems the first work (w.r.t. the literature in information flow) proving formally that in certain cases the optimal attack strategy is necessarily probabilistic.
Evolutionary game of coalition building under external pressure
Creators: name: Cecchin, Alekos
name: Kolokoltsov, Vassili N.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We study the fragmentation-coagulation (or merging and splitting) evolutionary control model as introduced recently by one of the authors, where $N$ small players can form coalitions to resist to the pressure exerted by the principal. It is a Markov chain in continuous time and the players have a common reward to optimize. We study the behavior as $N$ grows and show that the problem converges to a (one player) deterministic optimization problem in continuous time, in the infinite dimensional state space.
On the observation of Hypokalemia in Covid-19
Creators: name: Sparavigna, Amelia Carolina
Publisher: name: Zenodo
Year: 2020
Subjects: Hypokalemia
Covid-19

description: Hypokalemia is a low level of potassium in the blood serum. Here a survey of literature about the observation of Hypokalemia in Covid-19. In particular we consider the study published in a MedRvix preprint "Hypokalemia and clinical implications in patients with coronavirus disease 2019 (COVID-19)".
Generalised Fractional Evolution Equations of Caputo Type
Creators: name: Hernández-Hernández, M. E.
name: Kolokoltsov, V. N.
name: Toniazzi, L.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: This paper is devoted to the study of generalised time-fractional evolution equations involving Caputo type derivatives. Using analytical methods and probabilistic arguments we obtain well-posedness results and stochastic representations for the solutions. These results encompass known linear and non-linear equations from classical fractional partial differential equations such as the time-space-fractional diffusion equation, as well as their far reaching extensions. \\ Meaning is given to a probabilistic generalisation of Mittag-Leffler functions.
description: To be published in 'Chaos, Solitons & Fractals'
An elementary proof of Lelli Chiesa's theorem on constancy of second coordinate of gonality sequence
Creators: name: Pal, Sarbeswar
Publisher: name: arXiv
Year: 2017
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: Let $X$ be a K3 surface and $L$ be an ample line bundle on it. In this article we will give an alternative and elementary proof of Lelli Chiesa's Theorem in the case of $r= 2$. More precisely we will prove that that under certain condition the second co-ordinate of the gonality sequence is constant along the smooth curves in the linear system $|L|$. Using Lelli Chiesa's theorem for $r \ge 3$ we also extend Lelli Chiesa's Theorem in the case of $r= 2$ in weaker condition.
description: Final version
Reach Set Approximation through Decomposition with Low-dimensional Sets and High-dimensional Matrices
Creators: name: Bogomolov, Sergiy
name: Forets, Marcelo
name: Frehse, Goran
name: Podelski, Andreas
name: Schilling, Christian
name: Viry, Frédéric
Publisher: name: arXiv
Year: 2018
Subjects: subject: Systems and Control (eess.SY)
subject: Dynamical Systems (math.DS)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: Approximating the set of reachable states of a dynamical system is an algorithmic yet mathematically rigorous way to reason about its safety. Although progress has been made in the development of efficient algorithms for affine dynamical systems, available algorithms still lack scalability to ensure their wide adoption in the industrial setting. While modern linear algebra packages are efficient for matrices with tens of thousands of dimensions, set-based image computations are limited to a few hundred. We propose to decompose reach set computations such that set operations are performed in low dimensions, while matrix operations like exponentiation are carried out in the full dimension. Our method is applicable both in dense- and discrete-time settings. For a set of standard benchmarks, it shows a speed-up of up to two orders of magnitude compared to the respective state-of-the art tools, with only modest losses in accuracy. For the dense-time case, we show an experiment with more than 10.000 variables, roughly two orders of magnitude higher than possible with previous approaches.