cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Approximation of values of algebraic elements over the ring of power sums
Creators: name: Fuchs, Clemens
name: Heintze, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: Let $ \mathbb{Q}\mathcal{E}_{\mathbb{Z}} $ be the set of power sums whose characteristic roots belong to $ \mathbb{Z} $ and whose coefficients belong to $ \mathbb{Q} $, i.e. $ G : \mathbb{N} \rightarrow \mathbb{Q} $ satisfies \begin{equation*} G(n) = G_n = b_1 c_1^n + \cdots + b_h c_h^n \end{equation*} with $ c_1,\ldots,c_h \in \mathbb{Z} $ and $ b_1,\ldots,b_h \in \mathbb{Q} $. Furthermore, let $ f \in \mathbb{Q}[x,y] $ be absolutely irreducible and $ α: \mathbb{N} \rightarrow \overline{\mathbb{Q}} $ be a solution $ y $ of $ f(G_n,y) = 0 $, i.e. $ f(G_n,α(n)) = 0 $ identically in $ n $. Then we will prove under suitable assumptions a lower bound, valid for all but finitely many positive integers $ n $, for the approximation error if $ α(n) $ is approximated by rational numbers with bounded denominator. After that we will also consider the case that $ α$ is a solution of \begin{equation*} f(G_n^{(0)}, \ldots, G_n^{(d)},y) = 0, \end{equation*} i.e. defined by using more than one power sum and a polynomial $ f $ satisfying some suitable conditions. This extends results of Bugeaud, Corvaja, Luca, Scremin and Zannier.
description: 19 pages
X-ray, Optical and Infrared Observations of GX 339-4 During Its 2011 Decay
Creators: name: Dincer, Tolga
name: Kalemci, Emrah
name: Buxton, Michelle M.
name: Bailyn, Charles D.
name: Tomsick, John A.
name: Corbel, Stephane
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report multiwavelength observations of the black hole transient GX 339-4 during its outburst decay in 2011 using the data from RXTE, Swift and SMARTS. Based on the X-ray spectral, temporal, and the optical/infrared (OIR) properties, the source evolved from the soft-intermediate to the hard state. Twelve days after the start of the transition towards the hard state, a rebrightening was observed simultaneously in the optical and the infrared bands. Spectral energy distributions (SED) were created from observations at the start, and close to the peak of the rebrightening. The excess OIR emission above the smooth exponential decay yields flat spectral slopes for these SEDs. Assuming that the excess is from a compact jet, we discuss the possible locations of the spectral break that mark the transition from optically thick to optically thin synchrotron components. Only during the rising part of the rebrightening, we detected fluctuations with the binary period of the system. We discuss a scenario that includes irradiation of the disk in the intermediate state, irradiation of the secondary star during OIR rise and jet emission dominating during the peak to explain the entire evolution of the OIR light curve.
description: 10 pages with 11 figures, accepted for publication in ApJ
Besenwirtschaften als Möglichkeit der Einkommenskombination in der Weinwirtschaft
Creators: name: Rüdiger, Jens
Publisher: name: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft
Year: 2020

description: Weintourismus ist ein Markt, der sich zunehmendem Interesse erfreut, denn Wein und seine Herstellung steigt im Interesse der Deutschen bei der Freizeitgestaltung – vor allem in Verbindung mit Urlaub und Tourismus. Trotz der Thematisierung von Diversifikationsstrategien und der Suche nach Einkommensalternativen in der Landwirtschaft, liegen kaum wissenschaftliche Daten zu einer der ältesten Einkommens-alternativen in der Weinwirtschaft, den Besenwirtschaften, vor. Daher wurde in dieser Arbeit der Frage nach dem Stellenwert der Einkommensalternative für Weinerzeuger, die dieses Element in ihr Unternehmenskonzept integriert haben, nachgegangen. Weitergehend wurden Erkenntnisse über die Zielgruppe, die zeitliche Eingrenzung der jährlichen Betriebsdauer und die Art der Bewerbung gesammelt. In der empirischen Erhebung zeigt sich, dass Besenwirtschaften allgemein einen sehr hohen Stellenwert im Bereich der Umsatzgenerierung von Weingütern haben, die diese Einkommensalternative in ihr Unternehmenskonzept integriert haben. Dies dient zum einen als Vermarktungsinstrument für den eigentlich erzeugten Wein, aber auch als eigene strategische Geschäftseinheit. Signifikante Unterschiede zeigen sich bei der Größe der Weingüter, da diese Betriebsform gerade für kleinere Weingüter unter 10 Hektar als elementar angesehen werden kann. Bei der Zielgruppe der Gäste spielen für Besenwirtschaften primär einheimische Gäste eine Rolle.
description: Berichte über Landwirtschaft - Zeitschrift für Agrarpolitik und Landwirtschaft, Aktuelle Beiträge
Additional file 8 of Stop codon readthrough alters the activity of a POU/Oct transcription factor during Drosophila development
Creators: name: Zhao, Yunpo
name: Lindberg, Bo Gustav
name: Esfahani, Shiva Seyedoleslami
name: Tang, Xiongzhuo
name: Piazza, Stefano
name: Engström, Ylva
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 8. Three-dimensional structure of a larval brain-ring gland complex. a Schematic illustration of an L3 larva (upper) and a BRGC, lateral view, anterior to the left. RG, ring gland; BL, brain lobe; VNC, ventral nerve cord; D, dorsal; L, lateral; A, anterior. The ring gland is attached to the brain. It also connects to the spiracles and mouth hooks via the trachea. The bilateral trachea interconnect within the gland. b 3D reconstruction of a larval BRGC, posterior view. Aug-Gal4 > UAS-GFP marks the corpus allatum (green), anti-Sad the prothoracic gland (red), and DAPI stains DNA (blue).
On a Problem of Steinhaus
Creators: name: Anholcer, Marcin
name: Bosek, Bartłomiej
name: Grytczuk, Jarosław
name: Gutowski, Grzegorz
name: Przybyło, Jakub
name: Pyzik, Rafał
name: Zając, Mariusz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: Let $N$ be a positive integer. A sequence $X=(x_1,x_2,\ldots,x_N)$ of points in the unit interval $[0,1)$ is piercing if $\{x_1,x_2,\ldots,x_n\}\cap \left[\frac{i}{n},\frac{i+1}{n} \right) \neq\emptyset$ holds for every $n=1,2,\ldots, N$ and every $i=0,1,\ldots,n-1$. In 1958 Steinhaus asked whether piercing sequences can be arbitrarily long. A negative answer was provided by Schinzel, who proved that any such sequence may have at most $74$ elements. This was later improved to the best possible value of $17$ by Warmus, and independently by Berlekamp and Graham. In this paper we study a more general variant of piercing sequences. Let $f(n)\geq n$ be an infinite nondecreasing sequence of positive integers. A sequence $X=(x_1,x_2,\ldots,x_{f(N)})$ is $f$-piercing if $\{x_1,x_2,\ldots,x_{f(n)}\}\cap \left[\frac{i}{n},\frac{i+1}{n} \right) \neq\emptyset$ holds for every $n=1,2,\ldots, N$ and every $i=0,1,\ldots,n-1$. A special case of $f(n)=n+d$, with $d$ a fixed nonnegative integer, was studied by Berlekamp and Graham. They noticed that for each $d\geq 0$, the maximum length of any $(n+d)$-piercing sequence is finite. Expressing this maximum length as $s(d)+d$, they obtained an exponential upper bound on the function $s(d)$, which was later improved to $s(d)=O(d^3)$ by Graham and Levy. Recently, Konyagin proved that $2d\leqslant s(d)< 200d$ holds for all sufficiently big $d$. Using a different technique based on the Farey fractions and stick-breaking games, we prove here that the function $s(d)$ satisfies $\left\lfloor{}c_1d\right\rfloor{}\leqslant s(d)\leqslant c_2d+o(d)$, where $c_1=\frac{\ln 2}{1-\ln 2}\approx2.25$ and $c_2=\frac{1+\ln2}{1-\ln2}\approx5.52$. We also prove that there exists an infinite $f$-piercing sequence with $f(n)= γn+o(n)$ if and only if $γ\geq\frac{1}{\ln 2}\approx 1.44$.
description: 16 pages
ScreenLLM: Stateful Screen Schema for Efficient Action Understanding and Prediction
Creators: name: Jin, Yiqiao
name: Petrangeli, Stefano
name: Shen, Yu
name: Wu, Gang
Publisher: name: arXiv
Year: 2025
Subjects: subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Graphical User Interface (GUI) agents are autonomous systems that interpret and generate actions, enabling intelligent user assistance and automation. Effective training of these agent presents unique challenges, such as sparsity in supervision signals, scalability for large datasets, and the need for nuanced user understanding. We propose stateful screen schema, an efficient representation of GUI interactions that captures key user actions and intentions over time. Building on this foundation, we introduce ScreenLLM, a set of multimodal large language models (MLLMs) tailored for advanced UI understanding and action prediction. Extensive experiments on both open-source and proprietary models show that ScreenLLM accurately models user behavior and predicts actions. Our work lays the foundation for scalable, robust, and intelligent GUI agents that enhance user interaction in diverse software environments.
description: Accepted to MM4SG Workshop at The Web Conference 2025
DESIGNING EFFECTIVE EFL LEARNING MATERIALS FOR INTERMEDIATE LEVEL
Creators: name: Akramova, Aziza
Publisher: name: Zenodo
Year: 2023

description: English in Uzbekistan is a foreign language. In the class room, it is not used completely; it is used with Indonesian language. In addition, it is not used in everyday communication. This condition makes it difficult for students to master the language. Students have a very limited time in the classroom to practice and increase the language skills, and they do not have much time in the classroom to practice all skills intended by the school curriculum to acquired, that is the school curriculum.
Improved Experimental and Mathematical Techniques for Measurement of Solvent Gas Diffusivity in Heavy Oils
Creators: name: Etminan, Seyed Reza
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Engineering
subject: Engineering--Petroleum
subject: Diffusion coefficient
subject: Solvent Based Techniques
subject: Reservoir Engineering
subject: Heavy Oil
subject: measurement

description: Efficient recovery of heavy oil and bitumen is still very challenging and remains an issue of ongoing research all around the world. Thermal recovery methods, which rely on heat for viscosity reduction, are generally accepted as viable and several steam based projects have been successful, especially in Canada. Using light hydrocarbon solvents can provide similar viscosity reduction and is potentially more efficient in so-called challenging reservoirs where thermal methods do not work. In comparison with thermal methods, solvent based processes are more environmentally friendly and require no fresh water resources. The solvent based processes rely on molecular diffusion for in situ mixing of the solvent with the oil and generally provide much slower rates of oil production than the thermal processes. This is so because the molecular diffusivity is often much smaller than the thermal diffusivity. However, the published information on experimentally determined diffusivity of gaseous solvents in heavy oil and bitumen is very scarce. Therefore, accurate measurement of molecular diffusion coefficient is necessary for reliable design of solvent-based recovery processes in heavy oil reservoirs. There is no well-established and universally applicable technique for measuring molecular diffusion coefficient. Measurements of mass transfer characteristic are often more difficult due to difficulties in measuring point values of concentration and other issues which complicate this transport process such as phase equilibrium, effect of convective transport and having a mixture rather than a pure fluid. These issues make it necessary to employ several simplifying assumptions in mathematical modeling and interpreting the experiments to determine the diffusivity. The focus of this thesis is on improvement of experimental and mathematical techniques for measurement of unknown mass transfer parameters, specifically molecular diffusion coefficient, in dissolution of gaseous solvents into bitumen in binary systems. This is accomplished through identification of different phenomena or states occurring during the diffusion of gaseous solvents into bitumen and accordingly, development of improved experimental technique, mathematical models and computational algorithms for different cases. Diffusion coefficient of methane, carbon dioxide and propane were estimated as gaseous solvents diffusing into bitumen and it was shown that the estimated parameters generally agree with those reported in the literature. The outcome of this study is directly relevant to the in situ recovery of heavy oils and bitumen; however, the proposed techniques could also be applied to other applications for determination of diffusivity of gases dissolving into non-volatile liquid systems.
Teachers' professional development in a challenging educational context - a study of actual practice in rural western Kenya
Creators: name: Onguko, Brown
Publisher: name: Education
Year: 2012
Subjects: subject: Education--Technology
subject: Challenging context
subject: Appropriate technology
subject: Open educational resources
subject: Blended learning
subject: Tablets

description: This research adopted a design research approach, utilizing a mixture of methods including narratives, ethnographic observations, qualitative interviews and documentation of design artifacts. It was implemented in a challenging context in Western Kenya. The first research question for this study was: How might professional development (PD), offered through a blended learning approach and delivered by appropriate technologies, inform potential change to teaching practice in a challenging context in Kenya? Research question two sought to understand the implications of the professional development implemented in this study for teachers and professional development teachers (PDTs). Question three sought to understand the sustainability and scalability of the professional development approach The theoretical framework informing this research is based on activity theory- a needs-driven and goal directed process through tool mediation, and entails division of labor and isolation of partial tasks in a community of relationships (Vygotsky, 1978; Leont’ev, 1978; Engestrom, 1987; 1999; 2000; 2008). Key features of activity theory are active engagement and social interaction, which enabled teachers to collaboratively work with each other, studying through appropriate technologies to inform their teaching practices. Based on a review of literature, interviews with teachers and observation of teachers during face-to-face meetings in professional development and in their classroom practice, this study suggests that teachers in a challenging context can inform potential change to their teaching as a result of participation in locally developed content, delivered through blended learning on appropriate technologies. This study observes that through self-directed study on tablets, and occasional face-to-face interaction, teachers can transform into a community of learners that support each other in planning for their lessons. Content development involving local experts is critical to such interventions in challenging contexts, while drawing from global web content, harnessing open educational resources and being sensitive to local culture. Reflective conversations, professional dialogues and technology stewardship were all critical in informing teachers’ practice.
Channel Modeling for Multi-Receiver Molecular Communication Systems
Creators: name: Yaylali, Gokberk
name: Akdeniz, Bayram Cevdet
name: Tugcu, Tuna
name: Pusane, Ali Emre
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Molecular Communication via Diffusion (MCvD) is a prominent small-scale technology, which roots from the nature. With solid analytical foundations on channel response and advanced modulation techniques, molecular single-input-single-output (SISO) systems are one of the most studied molecular networks in the literature. However, the literature is yet to provide sufficient analytical channel modeling on molecular multiple-output systems with fully absorbing receivers, {one of the common applications in the area. In this paper, a channel model for molecular single-input-multiple-output (SIMO) systems is proposed for estimating the channel response of such systems. With the model's recursive nature, the closed-form solution of the channel response of molecular 2-Rx SIMO systems is analytically derived. A simplified model with lower complexity is also presented at a cost of slightly less accurate channel estimation. The models are extended to the molecular SIMO systems with more than two receivers. The performance of the methods are evaluated for several topologies with different parameters, and the accuracy of the model is verified by comparing to computer-simulated channel estimations in terms of quantitative error metrics such as root-mean-squared error. The performance of the simplified model is verified by the amount of deviation, indicating sufficient channel modeling performance with reduced computational power.
description: 13 pages, 13 figures. Published in IEEE Transactions on Communications
CtrA and GtaR : two systems that regulate the Gene Transfer Agent in Rhodobacter capsulatus
Creators: name: Leung, Molly Mo-Yin
Publisher: name: University of British Columbia
Year: 2010

description: Bacteria are found in almost all conceivable environments, and some species can survive many different conditions. The ability to detect environmental conditions and respond with appropriate changes to gene expression is essential to survival. Bacteria sometimes express genes involved in horizontal gene transfer when encountering a stressful environment. Horizontal gene transfer has an important role in the evolution of prokaryotic genomes. Rhodobacter capsulatus produces a mediator of horizontal gene transfer called the gene transfer agent (GTA). The R. capsulatus GTA is a bacteriophage-like particle that transfers ~4 kb of double stranded genomic DNA using a transduction-like mechanism. Previously, two proteins encoded outside the GTA gene cluster, GtaI and CtrA, were found to regulate GTA expression. GtaI and GtaR are LuxI-type and LuxR-type quorum sensing proteins, respectively. CtrA and CckA are homologues of the response regulator and sensor kinase, respectively, of the Caulobacter crescentus CtrA/CckA signal transduction system. In this thesis, I studied the interactions between these regulatory proteins, environmental conditions and GTA in R. capsulatus. I found that growth conditions had opposite effects on GTA and ctrA expression, but no effect on gtaR expression, and phosphate limitation decreased expression of ctrA. Knockout experiments revealed that GtaI and GtaR affect ctrA, gtaR and GTA expression. Results from GtaR-DNA binding experiments were consistent with a model in which GtaR directly regulates its own expression but indirectly regulates ctrA and GTA expression. These studies also identified GtaR binding sequences. I found that in R. capsulatus CtrA did not regulate its own transcription, contrary to what occurs in C. crescentus. My research also showed that GTA expression was affected by at least one other unidentified system. Promoter deletion studies of ctrA, gtaR and GTA genes identified sequences that may be involved in GtaI-, GtaR-, CtrA-, and/or growth condition-based regulation. Overall, these studies contribute to the understanding of how bacteria detect multiple environmental signals and respond with changes to gene expression.
Universal critical properties of the Eulerian bond-cubic model
Creators: name: Ding, Cheng-Xiang
name: Yao, Gui-Yuan
name: Li, Song
name: Deng, Youjin
name: Guo, Wen-An
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We investigate the Eulerian bond-cubic model on the square lattice by means of Monte Carlo simulations, using an efficient cluster algorithm and a finite-size scaling analysis. The critical points and four critical exponents of the model are determined for several values of $n$. Two of the exponents are fractal dimensions, which are obtained numerically for the first time. Our results are consistent with the Coulomb gas predictions for the critical O($n$) branch for $n < 2$ and the results obtained by previous transfer matrix calculations. For $n=2$, we find that the thermal exponent, the magnetic exponent and the fractal dimension of the largest critical Eulerian bond component are different from those of the critical O(2) loop model. These results confirm that the cubic anisotropy is marginal at $n=2$ but irrelevant for $n<2$.
Modifying Muscle Properties in a Leading Neuromuscular Model: The Fuglevand Model Revisited
Creators: name: Robertson, Jason W.
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Engineering--Biomedical
subject: neuromuscular
subject: Model
subject: Simulation
subject: motor unit
subject: muscle fibre
subject: Fuglevand
subject: fibre properties
subject: regionalization
subject: force variability
subject: EMG-force
subject: Optimization

description: The Fuglevand model is common to many neuromuscular simulations. However, there are elements of the physiological system currently unaccounted for by this model. The objective of this thesis was to address two of them, and observe their effects on the simulated surface electromyogram (EMG) and muscle force. The first was regionalization, the tendency of different motor unit (MU) types to predominantly reside in different regions of the muscle. We found that preferentially placing slow MUs deep and fast MUs superficially caused the EMG-force relation to become more linear, suggesting that regionalization is a relevant factor for future models. The second was modelling muscle fibres as individual entities instead of abstract quantities. We found that when modelling individual fibre properties, the force mean-variability relation no longer resembled that observed physiologically, suggesting that additional modifications, based on factors known to influence physiological force variability, may be necessary, especially at high activation levels.
The Mass of the Compact Object in the X-Ray Binary Her X-1/HZ Her
Creators: name: Abubekerov, M. K.
name: Antokhina, E. A.
name: Cherepashchuk, A. M.
name: Shimanskii, V. V.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have obtained the first estimates of the masses of the components of the Her X-1/HZ Her X-ray binary system taking into account non-LTE effects in the formation of the H_gamma absorption line: mx=1.8Msun and mv=2.5Msun. These mass estimates were made in a Roche model based on the observed radial-velocity curve of the optical star, HZ Her. The masses for the X-ray pulsar and optical star obtained for an LTE model lie are mx=0.85\pm0.15Msun and mv=1.87\pm0.13Msun. These mass estimates for the components of Her X-1/HZ Her derived from the radial-velocity curve should be considered tentative. Further mass estimates from high-precision observations of the orbital variability of the absorption profiles in a non-LTE model for the atmosphere of the optical component should be made.
description: 20 pages, 4 tables, 8 figures
(P)reheating Effects of the Kähler Moduli Inflation I Model
Creators: name: Khan, Islam
name: Vincent, Aaron C.
name: Worthey, Guy
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate reheating in the string-theory-motivated Kähler Moduli Inflation I (KMII) potential, coupled to a light scalar field $χ$ and produce constraints and forecasts based on Cosmic Microwave Background (CMB) and gravitational wave observables. We implement a Markov Chain Monte Carlo (MCMC) sampling method to compute the adopted model's parameter ranges allowed by the current CMB observations. Floquet analysis and numerical lattice simulations are performed to analyze the nonlinear effects of the model's (p)reheating phase. We derive bounds on the $Λ$CDM parameters $A_s$, $n_s$, $n_{\mathrm{run}}$, and $r$ based on \textit{Planck} results, finding that correlations between model parameters severely constrain the range of these parameters allowed within this model. While the KMII potential's non-vanishing minimum may provide a possible source for the observed dark energy density $ρ_{\mathrm{DE}}$ this cannot be tested with current observations. We estimate the $95\%$ CI bounds on the inflaton mass $m_ϕ$ and reheating temperature $T_{\mathrm{reh}}$ to be $2.1 \times 10^{13} \, \mathrm{GeV} \lesssim m_ϕ \lesssim 3.2 \times 10^{13} \, \mathrm{GeV}$ and $T_{\mathrm{reh}} \gtrsim 1.8 \times 10^{3} \, \mathrm{GeV}$, respectively. We observe {both} self-resonance and parametric resonance instability band structures in our Floquet analysis results. Finally, we do not observe any formation of oscillon configurations in our lattice simulations; however, our results predict a stochastic gravitational wave background generated during preheating that would be observable today in the $10^{9}$ - $10^{11} \, \mathrm{Hz}$ frequency range.
description: 24 pages, 12 figures, 1 table
Generalized Stillinger--David Potential
Creators: name: Zhyganiuk, Igor
Publisher: name: arXiv
Year: 2012
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present an improved version of the Stillinger--David polarization potential of the intermolecular interaction in water. A clear algorithm of construction of a function describing the oxygen-hydrogen interaction in water molecules is formulated. A new approach to the modeling of a function screening the charge-dipole interaction on small distances is developed. To describe the long-range asymptotics of the intermolecular potential, the bare Stillinger--David potential is supplemented by a term related to the interaction of dipole moments of oxygen ions. In addition, we introduce a term involving a deformation of the electron shells of oxygen ions to the polarization component. These corrections allow us to successfully reproduce all essential results of quantum mechanical calculations of the interaction energy for water molecules obtained by Clementi. Analyzing the behavior of the dipole moment of a water molecule as a function of the intermolecular distance, we obtain the estimate of irreducible two-particle effects in water.
description: 8 pages, 6 figures
The Development of a Practical Measure of Environmental-Scale Spatial Ability: the Spatial Configuration Task
Creators: name: Burles, Clayton Ford
Publisher: name: Graduate Studies
Year: 2014
Subjects: Psychology--Cognitive
Psychology--Experimental
Psychometrics

description: The ability to orient and navigate throughout an environment is a fundamental yet complex cognitive skill. This ability may be valuable in certain academic fields (Hegarty, Crookes, Dara-Abrams, & Shipley, 2010) and military occupations (Shanmugaratnam & Parush, 2012), and an assessment of these environmental-scale spatial skills for use in selection or training would be valuable. With this in mind, a new task (the Spatial Configuration Task) was developed and it’s suitability for group testing environmental-scale spatial skills was assessed. The Spatial Configuration Task was demonstrated to be reliable (test-retest reliability r = .814), valid (significantly correlated with the Cognitive Map Formation and Use Tasks; r =-.414, r = .339 respectively), and practical (average duration of 9.69 minutes). This task may have useful applications in selection as well as research, as there are few standardized measures of environmental-scale spatial ability suitable for mass testing.
Decolonizing Historical Archaeology in Southern Oaxaca, Mexico: Late Formative to Republican Periods
Creators: name: Zborover, Dan
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Archaeology
subject: Archaeology
subject: History
subject: Historical Archaeology
subject: Mesoamerica
subject: Oaxaca
subject: Chontal
subject: Decolonization

description: The cultural area roughly corresponding to the modern state of Oaxaca, Mexico, was a dynamic cultural arena which saw the rise and development of multiple complex societies and their respective historiographic traditions. This dissertation focuses on the development and application of integrative approaches to the archaeological, documentary, and oral records from the Chontal highlands in southern Oaxaca, with a particular emphasis on the Chontal community of Santa Maria Zapotitlan. Following a critique and reconfiguration of the methodological and theoretical tenets of ‘historical archaeology’, I propose to acknowledge and incorporate Mesoamerican indigenous literate societies within a more inclusive paradigm. Based on data collected in the ‘Chontalpa Historical Archaeology Project’, I draw my data from a rich documentary corpus of indigenous ‘territorial-narratives’, archaeological surveys and excavations, visual and archaeometric analysis of artifacts, ethnoarchaeology, and a systematic collection of oral traditions. By subjecting these epistemically independent sources to corroborative, complementary, and contrastive modes of inquiry, I explore low-level spatial and temporal correlates followed by high-level correlates of interregional interaction, colonialism, factionalism, and resistance. These integrative correlates are examined through five diachronic case-studies: 1) Monte Alban’s imperialism in the Formative period and interregional interactions in the Classic period; 2) Mixtec, Zapotec, and Pochutec conquests and domination of the Chontalpa in the Early-Late Postclassic; 3) The Aztec incursion and multi-polity/inter-ethnic factionalism in the Late-Terminal Postclassic; 4) Chontal and Spanish interregional competition, colonialism, and resistance in the Colonial Period; and 5) The Chontal historical image, from the Colonial through the Modern Period. By calling attention to the contrasts between the material and documentary records, this inclusive approach further challenges derogatory colonizer narratives of the Chontal people. To this end, a particular emphasis is placed on community-based participatory approaches and the relevance of this research to the contemporary Chontal ethnic group. As such, this study is rooted in debates on decolonization and the Postcolonial critique, indigenous agency, and re-writing alternative histories. It further aims to contribute to our understanding of southern Oaxacan history and archaeology, the formulation of heuristic guidelines to Mesoamerican integrative studies, and the development of an inclusive historical archaeology in Oaxaca, and beyond.
Traces on cores of C*-algebras associated with self-similar maps
Creators: name: Kajiwara, Tsuyoshi
name: Watatani, Yasuo
Publisher: name: arXiv
Year: 2012
Subjects: subject: Operator Algebras (math.OA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 46L08, 46L55

description: We completely classify the extreme tracial states onthe cores of the C*-algebras associated with self-similar maps on compact metric spaces. We present a complete list of them. The extreme tracial states are the union of the discrete type tracial states given by measures supported on the finite orbits of the branch points and a continuous type tracial state given by the Hutchinson measure on the original self-similar set.
description: LaTeX 2e, 25 pages
Development and Validation of the Quality of Trauma Care Patient-Reported Experience Measure
Creators: name: Bobrovitz, Niklas
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Health Care Management
subject: Medicine and Surgery
subject: injury
subject: Trauma
subject: psychometric
subject: survey

description: To deliver patient-centered injury care, patient perspectives must be incorporated into quality measurement and improvement. Therefore, the purpose of this thesis was to develop and validate a measure of patient experience for use as a quality improvement tool in injury care. A draft survey measure of patient injury care experience was revised using cognitive interviews with 30 injury patients/surrogates. A multi-site prospective cohort study of 400 patients/surrogates was conducted and provided evidence of the measure's validity, reliability, and feasibility of implementation. Analysis of responses to the free-text items on the measure indicated that qualitative data obtained from open-ended items may be a valuable supplement to the quantitative component of the measure. The results of this thesis show that the Quality of Trauma Care Patient-Reported Experience Measure (QTAC-PREM) is valid and reliable and could be used as a tool to guide quality improvement efforts.
Effect of sodium butyrate on HDAC8 mRNA expression in colorectal cancer cell lines and molecular docking study of LHX1 - sodium butyrate interaction
Creators: name: Forouzesh, Flora
name: Ghiaghi, Mahsa
name: Rahimi, Hamzeh
Publisher: name: IfADo - Leibniz Research Centre for Working Environment and Human Factors, Dortmund
Year: 2020
Subjects: subject: Colorectal cancer
subject: Sodium butyrate
subject: HDAC8 gene
subject: LHX1 transcription factor
subject: Docking
subject: HT-29
subject: HCT-116 cell lines
subject: 610

description: Colorectal cancer (CRC) is the third common cancer and the fourth leading cause of cancer related death worldwide. Histone Deacetylase 8 (HDAC8) has a unique feature and is a good target for drug design. The LHX1 factor is an important transcription factor for this gene. The aim of this study was to investigate the effect of sodium butyrate (NaB) as a histone deacetylase inhibitors on the expression of the HDAC8 gene in the colorectal cancer cell line, and the molecular docking of LHX1 transcription factor with NaB. HCT-116 and HT-29 cell lines were treated with different concentrations of NaB (6.25mM to 150 mM) at 24, 48 and 72 hours. RNA was extracted from the treated and untreated cells and cDNA was synthesized. Quantitative Real-Time-PCR was done to investigate the mRNA expression of HDAC8. Molecular docking was performed to investigate NaB and LHX1 interaction. On the base of Real-time-PCR results, the concentration of 150 mM NaB after 24 hours in HT-29 and HCT-116 cell lines caused a significant reduction in mRNA expression of HDAC8 (P<0.05). In 48 hours of treatment, there was a significant decrease in the mRNA expression of HDAC8 at all concentrations (P<0.05). The docking results showed that LHX1 and NaB interacted the best way with the lowest energy levels. Our results showed that NaB bond to LHX1 strongly. Our results demonstrated that NaB bind to the LHX1 transcription factor and inhibited the function of this factor and subsequently the transcription from the HDAC8 gene was decreased and results in cell death. Future studies are needed to assess the molecular mechanisms of NaB on gene expression.
description: EXCLI Journal;Vol. 19. 2020, 1038-1051
Extreme value laws in dynamical systems under physical observables
Creators: name: Holland, Mark P.
name: Vitolo, Renato
name: Rabassa, Pau
name: Sterk, Alef E.
name: Broer, Henk W.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: Chaotic Dynamics (nlin.CD)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Extreme value theory for chaotic dynamical systems is a rapidly expanding area of research. Given a system and a real function (observable) defined on its phase space, extreme value theory studies the limit probabilistic laws obeyed by large values attained by the observable along orbits of the system. Based on this theory, the so-called block maximum method is often used in applications for statistical prediction of large value occurrences. In this method, one performs inference for the parameters of the Generalised Extreme Value (GEV) distribution, using maxima over blocks of regularly sampled observations along an orbit of the system. The observables studied so far in the theory are expressed as functions of the distance with respect to a point, which is assumed to be a density point of the system's invariant measure. However, this is not the structure of the observables typically encountered in physical applications, such as windspeed or vorticity in atmospheric models. In this paper we consider extreme value limit laws for observables which are not functions of the distance from a density point of the dynamical system. In such cases, the limit laws are no longer determined by the functional form of the observable and the dimension of the invariant measure: they also depend on the specific geometry of the underlying attractor and of the observable's level sets. We present a collection of analytical and numerical results, starting with a toral hyperbolic automorphism as a simple template to illustrate the main ideas. We then formulate our main results for a uniformly hyperbolic system, the solenoid map. We also discuss non-uniformly hyperbolic examples of maps (Hénon and Lozi maps) and of flows (the Lorenz63 and Lorenz84 models). Our purpose is to outline the main ideas and to highlight several serious problems found in the numerical estimation of the limit laws.
Graded irreducible representations of Leavitt path algebras: a new type and complete classification
Creators: name: Vas, Lia
Publisher: name: arXiv
Year: 2022
Subjects: subject: Rings and Algebras (math.RA)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 16S88, 16G99, 16W50, 16D60

description: We present a new class of graded irreducible representations of a Leavitt path algebra. This class is new in the sense that its representation space is not isomorphic to any of the existing simple Chen modules. The corresponding graded simple modules complete the list of Chen modules which are graded, creating an exhaustive class: the annihilator of any graded simple module is equal to the annihilator of either a graded Chen module or a module of this new type. Our characterization of graded primitive ideals of a Leavitt path algebra in terms of the properties of the underlying graph is the main tool for proving the completeness of such classification. We also point out a problem with the characterization of primitive ideals of a Leavitt path algebra in [K. M. Rangaswamy, Theory of prime ideals of Leavitt path algebras over arbitrary graphs, J. Algebra 375 (2013), 73 -- 90].
description: This version is to appear in the Journal of Pure and Applied Algebra
Time-dependent quantum graph
Creators: name: Matrasulov, D. U.
name: Yusupov, J. R.
name: Sabirov, K. K.
name: Sobirov, Z. A.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: In this paper we study quantum star graphs with time-dependent bond lengths. Quantum dynamics is treated by solving Schrodinger equation with time-dependent boundary conditions given on graphs. Time-dependence of the average kinetic energy is analyzed. Space-time evolution of the Gaussian wave packet is treated for harmonically breathing star graph.
Unraveling mechanisms behind cross presentation during phagocytic signaling
Creators: name: Hari, Aswin
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Immunology
subject: FOS: Clinical medicine
subject: cross presentation

description: MHC class I antigens come from endogenous syntheses, while class II antigens are obtained extracellularly via endocytosis. Cross presentation is the link between the two by which external antigens are targeted to the MHC class I pathway. It is generally accepted that particulate antigens are more efficient in this pathway switch. However the reason behind this phenomenon is unknown. We report that dendritic cell engagement of a phagocytic target limits endocytic maturation and inhibits the associated proteolytic activities. In this scenario, early endosomes show reduced progression towards late endosomes/lysosomes and remain spatially close to the cell membrane. In phagocytosis, the microtubular (MT) system, including tubulin filaments and microtubule organization centers (MTOCs), are heavily skewed toward the engulfed particulate matter; the remaining cytoplasmic volumes are relatively devoid of MT presence. This is accompanied by a reduced centripetal movement inward and the maturation of endosomes. The antigen processing in these arrested endosomes is under the control of Nicotinamide adenine dinucleotide phosphate-oxidase (NAPDH)-associated ROS. We also show that cathepsin S is responsible for the generation of the class I epitope for cross presentation. The rerouted antigen presentation is at least 40 fold more efficient than the same amount of antigen delivered through the phagocytic pathway, and is operational in vivo. Our results suggest that in DCs in addition to solid structure uptake, phagocytosis directs a coordinated set of enzymatic and cytoskeletal events that regulate endosomal trafficking and maturation. As a consequence, external soluble antigens are driven away from their conventional MHC class II processing, into the class I cross presentation pathway.
Additional file 1 of Monitoring cold water injections for reservoir characterization using a permanent fiber optic installation in a geothermal production well in the Southern German Molasse Basin
Creators: name: Schölderle, Felix
name: Lipus, Martin
name: Pfrang, Daniela
name: Reinsch, Thomas
name: Haberer, Sven
name: Einsiedl, Florian
name: Zosseder, Kai
Publisher: name: figshare
Year: 2021
Subjects: subject: Biophysics
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 20199 Astronomical and Space Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Inorganic Chemistry

description: Additional file 1. Completion of the geothermal wells at Schäftlarnstraße that were used for the FO-monitoring system.
A three-field phase-field model for mixed-mode fracture in rock based on experimental determination of the mode II fracture toughness
Creators: name: Hug, Lisa
name: Potten, Martin
name: Stockinger, Georg
name: Thuro, Kurosch
name: Kollmannsberger, Stefan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: In this contribution, a novel framework for simulating mixed-mode failure in rock is presented. Based on a hybrid phase-field model for mixed-mode fracture, separate phase-field variables are introduced for tensile (mode I) and shear (mode II) fracture. The resulting three-field problem features separate length scale parameters for mode I and mode II cracks. In contrast to the classic two-field mixed-mode approaches it can thus account for different tensile and shear strength of rock. The two phase-field equations are implicitly coupled through the degradation of the material in the elastic equation, and the three fields are solved using a staggered iteration scheme. For its validation, the three-field model is calibrated for two types of rock, Solnhofen Limestone and Pfraundorfer Dolostone. To this end, double-edge notched Brazilian disk (DNBD) tests are performed to determine the mode II fracture toughness. The numerical results demonstrate that the proposed phase-field model is able to reproduce the different crack patterns observed in the DNBD tests. A final example of a uniaxial compression test on a rare drill core demonstrates, that the proposed model is able to capture complex, 3D mixed-mode crack patterns when calibrated with the correct mode I and mode II fracture toughness.
Investigation of the Pre-ictal State Using Near Infrared Spectroscopy and Functional Magnetic Resonance Imaging
Creators: name: Vinette, Sarah
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Neuroscience
subject: Epilepsy
subject: Seizure
subject: Pre-ictal
subject: fMRI
subject: NIRS

description: The unpredictability of seizures impacts the quality of life of those with epilepsy. Previous studies have reported changes in cerebral hemodynamics prior to the onset of seizures, providing evidence of the existence of a pre-ictal state. In this thesis, near infrared spectroscopy (NIRS) and functional magnetic resonance imaging (fMRI) techniques were developed to characterize the variation in cerebral hemodynamics prior to seizures, in patients with focal epilepsy. The findings indicate that there are changes in cerebral hemodynamics within both hemispheres minutes prior to seizures. These results provide encouraging evidence that, with further technical improvements in the specificity of these techniques, the identification of such changes could allow sufficient time for measures to be taken to prevent seizure onset, thereby reducing the likelihood of seizures and improving the quality of life of those with epilepsy.
Upgrading of a Visbroken Vacuum Residue by Adsorption and Catalytic Steam Gasification of the Adsorbed Components
Creators: name: Carbognani, Lante
Publisher: name: Graduate Studies
Year: 2014
Subjects: subject: Engineering--Chemical
subject: Engineering--Petroleum
subject: Petroleum
subject: Adsorption
subject: catalytic steam gasification
subject: Catalytic Steam Cracking
subject: visbreaking
subject: Asphaltenes
subject: catalytic steam cracking kinetics
subject: Hydrogen Production

description: Unconventional oil is set to play an increasingly important role in world oil supply, where Canadian reserves are going to play a key role in the global market. The bitumen associated to these reserves typically contains more than 50% vacuum residue, thus developing new and less costly processing ideas is necessary. The present work focuses on a new process consisting of the improvement of Athabasca visbroken residue stability via adsorption using an in-house material, followed by low temperature catalytic steam gasification of the adsorbed material. A bench-scale setup was designed and built, and techniques such as P-value, thermal gravimetric analysis, and gas chromatography were used for products characterization. Results indicate that adsorption doesn’t seem to improve the visbroken residue, however an alternative path performing catalytic steam cracking instead shows an extra ~20% conversion of the feed, still maintaining a stable product. On the other hand, Catalytic steam gasification was achieved at low temperatures (560 ºC), with high production of hydrogen for the sorbcats tested, thus making possible an alternative path for the visbroken residue processing.
Pillai's conjecture for polynomials
Creators: name: Heintze, Sebastian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics

description: In this paper we study the polynomial version of Pillai's conjecture on the exponential Diophantine equation \begin{equation*} p^n - q^m = f. \end{equation*} We prove that for any non-constant polynomial $ f $ there are only finitely many vectors $ (n,m,\mathrm{deg}\ p,\mathrm{deg}\ q) $ with integers $ n,m \geq 2 $ and non-constant polynomials $ p,q $ such that Pillai's equation holds. Moreover, we will give some examples that there can still be infinitely many possibilities for the polynomials $ p,q $.
description: 7 pages