cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Stretched Root Systems and the Geometry of Shard Modules
Creators: name: Dana, Will
Publisher: name: My University
Year: 2023
Subjects: subject: Representations of algebras
subject: Coxeter groups
subject: Root systems
subject: Hyperplane arrangements
subject: Shards
subject: Mathematics
subject: FOS: Mathematics
subject: Science

description: A classic theorem of Gabriel states that, for a finite type Dynkin diagram G, the indecomposable representations of any quiver orienting G are in bijection with reflecting hyperplanes of the associated Coxeter group W. This is the starting point for a rich web of connections between the representation theory of algebras and the combinatorics and geometry of Coxeter groups. Recent work of Iyama, Reading, Reiten, and Thomas constructs a similar correspondence between brick modules of the preprojective algebra Pi_G for a finite type Dynkin diagram G and a combinatorially useful partition of the hyperplanes into cones called shards. A paper of the author, Speyer, and Thomas generalizes this beyond finite type Dynkin diagrams by defining a class of bricks of Pi_G called shard modules which correspond to shards for arbitrary diagrams G. Although harder to understand than in the finite type case, shard modules provide a potential categorical tool for studying infinite Coxeter groups and cluster algebras. In this thesis, we study how the relative position of shards affects the properties of their associated shard modules. We generalize beyond finite type a result of Iyama, Reading, Reiten, and Thomas showing that, when three shards meet in a certain configuration, their shard modules fit into a short exact sequence. We pay specific attention to "stretched" families of graphs obtained by inserting a path into a fixed diagram, describing recurring structure in the shards as the path grows. We use this structure to generalize patterns appearing in the shard modules for the A_n and D_n families of diagrams to any family of diagrams with tails.
On a Generalisation of Uniform Distribution and its Properties
Creators: name: Jayakumar, K.
name: Sankaran, Kothamangalth Krishnan
Publisher: name: Dep. of Statistical Sciences "Paolo Fortunati", Università di Bologna
Year: 2016
Subjects: Distribution of order statistics; Entropy; Marshall-Olkin family of distributions; Maximum likelihood; Random variate generation; Truncated negative binomial distribution

description: Nadarajah et al.(2013) introduced a family life time models using truncated negative binomial distribution and derived some properties of the family of distributions. It is a generalization of Marshall-Olkin family of distributions. In this paper, we introduce Generalized Uniform Distribution (GUD) using the approach of Nadarajah et al.(2013). The shape properties of density function and hazard function are discussed. The expression for moments, order statistics, entropies are obtained. Estimation procedure is also discussed.The GDU introduced here is a generalization of the Marshall-Olkin extended uniform distribution studied in Jose and Krishna(2011).
description: Statistica, Vol 76, No 1 (2016)
A semi-parametric regression model for analysis of middle censored lifetime data
Creators: name: Rao Jammalamadaka, S.
name: Prasad, Sundaresan Nair
name: Sankaran, Paduthol Godan
Publisher: name: Dep. of Statistical Sciences "Paolo Fortunati", Università di Bologna
Year: 2016
Subjects: Middle censoring; Proportional Hazards model; Self consistent estimator

description: Middle censoring introduced by Jammalamadaka and Mangalam (2003), refers to data arising in situations where the exact lifetime becomes unobservable if it falls within a random censoring interval, otherwise it is observable.
In the present paper we propose a semi-parametric regression model for such lifetime data, arising from an unknown population and subject to middle censoring.
We provide an algorithm to find the nonparametric maximum likelihood estimator (NPMLE) for regression parameters and the survival function. The consistency of the estimators are established.
We report simulation studies to assess the finite sample properties of the estimators.
We then analyze a real life data on survival times for diabetic patients studied by Lee et al. (1988).
description: Statistica, Vol 76, No 1 (2016)
Extended  New Generalized Lindley Distribution
Creators: name: Shibu, D. S.
name: Irshad, M. R.
Publisher: name: Dep. of Statistical Sciences "Paolo Fortunati", Università di Bologna
Year: 2016
Subjects: Lindley distribution; Maximum likelihood estimator; Inequality measures; Rényi entropy

description: In this paper, we consider an extended version of new generalized Lindley distribution (NGLD). We refer to this new generalization as the extended new generalized Lindley distribution (ENGLD). A comprehensive account of the mathematical properties of the new distribution including estimation is presented. A real life data set is considered here to illustrate the relevance of the new model and compared it with other forms of Lindley models using method of moment estimation and method of maximum likelihood estimation.
description: Statistica, Vol 76, No 1 (2016)
Local Cohomology Modules and Motivic Chern Class Computations
Creators: name: Wang, Nancy
Publisher: name: My University
Year: 2023
Subjects: subject: local cohomology
subject: associated primes
subject: motivic chern class
subject: D-modules
subject: nilpotent cone
subject: Mathematics
subject: FOS: Mathematics
subject: Science

description: We give a new proof of a result by Puthenpurakal on Lyubeznik's conjecture regarding the associated primes of local cohomology modules. The conjecture states that if $R$ is a regular ring and $I subset R$ is an ideal, then, for all $i$, the local cohomology module $H_I^i(R)$ has finitely many associated primes. The result of interest is for $H_I^{n-1}(R)$ where $R$ is of dimension $n$, contains $mathbb{Q}$, and satisfies a certain condition on the singular loci of its reduced quotient rings. We use the theory of $D$-modules over formal power series rings to show this, and also give a result on the codimension of the support of $H_I^i(R)$ when $R$ is further catenary, using the same methods. Next, we compute the equivariant motivic Chern class for the nilpotent cone in $M_n$, the space of $n times n$ matrices, and for the affine cone over a smooth hypersurface. In the nilpotent cone case, we consider the action of $text{GL}_n times mathbb{C}^star$ acting on $M_n$ by conjugation in $text{GL}_n$ and by scaling in $mathbb{C}^star$. With this action, the orbits of the nilpotent cone are the nilpotent orbits, indexed by partitions of $n$. Following the techniques of Feher, Rimanyi, and Weber, we compute the motivic Chern class of these nilpotent orbits. In the affine cone case, we consider the action of $mathbb{C}^star$ on $mathbb{A}^{n+1}$ by scaling and compute the motivic Chern class of the affine cone $C(D)$, in $mathbb{A}^{n+1}$, where $Dsubset mathbb{P}^n$ is a smooth hypersurface.
Supernova Relic Neutrino Search at Super-Kamiokande
Creators: name: Kamiokande Collaboration
name: Bays, K.
name: Iida, T.
name: Abe, K.
name: Hayato, Y.
name: Iyogi, K.
name: Kameda, J.
name: Koshio, Y.
name: Marti, L.
name: Miura, M.
name: Moriyama, S.
name: Nakahata, M.
name: Nakayama, S.
name: Obayashi, Y.
name: Sekiya, H.
name: Shiozawa, M.
name: Suzuki, Y.
name: Takeda, A.
name: Takenaga, Y.
name: Ueno, K.
name: Kajita, K. Ueshima S. Yamada T. Yokozawa H. Kaji T.
name: Kaneyuki, K.
name: McLachlan, T.
name: Okumura, K.
name: Pik, L. K.
name: Martens, K.
name: Vagins, M.
name: Labarga, L.
name: Kearns, E.
name: Litos, M.
name: Raaf, J. L.
name: Stone, J. L.
name: Sulak, L. R.
name: Kropp, W. R.
name: Mine, S.
name: Regis, C.
name: Renshaw, A.
name: Smy, M. B.
name: Sobel, H. W.
name: Ganezer, K. S.
name: Hill, J.
name: Keig, W. E.
name: Cho, S.
name: Jang, J. S.
name: Kim, J. Y.
name: Lim, I. T.
name: Albert, J.
name: Scholberg, K.
name: Walter, C. W.
name: Wendell, R.
name: Wongjirad, T.
name: Ishizuka, T.
name: Tasaka, S.
name: Learned, J. G.
name: Matsuno, S.
name: Smith, S.
name: Hasegawa, T.
name: Ishida, T.
name: Ishii, T.
name: Kobayashi, T.
name: Nakadaira, T.
name: Nakamura, K.
name: Nishikawa, K.
name: Oyama, Y.
name: Sakashita, K.
name: Sekiguchi, T.
name: Tsukamoto, T.
name: Suzuki, A. T.
name: Takeuchi, Y.
name: Ikeda, M.
name: Matsuoka, K.
name: Minamino, A.
name: Murakami, A.
name: Nakaya, T.
name: Fukuda, Y.
name: Itow, Y.
name: Mitsuka, G.
name: Miyake, M.
name: Tanaka, T.
name: Hignight, J.
name: Imber, J.
name: Jung, C. K.
name: Taylor, I.
name: Yanagisawa, C.
name: Kibayashi, A.
name: Ishino, H.
name: Mino, S.
name: Sakuda, M.
name: Mori, T.
name: Toyota, H.
name: Kuno, Y.
name: Kim, S. B.
name: Yang, B. S.
name: Okazawa, H.
name: Choi, Y.
name: Nishijima, K.
name: Koshiba, M.
name: Totsuka, Y.
name: Yokoyama, M.
name: Heng, Y.
name: Chen, S.
name: Zhang, H.
name: Yang, Z.
name: Mijakowski, P.
name: Connolly, K.
name: Dziomba, M.
name: Wilkes, R. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A new Super-Kamiokande (SK) search for Supernova Relic Neutrinos (SRNs) was conducted using 2853 live days of data. Sensitivity is now greatly improved compared to the 2003 SK result, which placed a flux limit near many theoretical predictions. This more detailed analysis includes a variety of improvements such as increased efficiency, a lower energy threshold, and an expanded data set. New combined upper limits on SRN flux are between 2.8 and 3.0 nu_e cm^-2 s^-1 > 16 MeV total positron energy (17.3 MeV E_nu).
Understanding, Modeling and Leveraging Temporal Change in Mental Health
Creators: name: Biester, Laura
Publisher: name: My University
Year: 2023
Subjects: subject: natural language processing
subject: computational social science
subject: mental health
subject: time series
subject: social media
subject: Computer Science
subject: Engineering

description: Mental health conditions such as depression affect hundreds of millions of people, and the prevalence of these conditions has grown as the COVID-19 pandemic has swept across the world. The global mental health crisis, along with the proliferation of related text data online, has led to the emergence of a community that applies Natural Language Processing techniques to aid mental health treatment, detection, and monitoring. In this dissertation, we focus on leveraging the fact that signals of human behavior unfold over time to build models of mental health. Then, we quantify temporal changes in the presentation of mental health symptoms to better understand communities and individuals with various conditions. Temporal change can be viewed as a challenge, making it harder to build robust models; however, we believe that it can be regarded as an opportunity for insight, as it can lead to enhanced understanding. In the right circumstances, temporal change can also be leveraged and incorporated during the modeling process to improve the robustness of the models. We explore how the targeted selection of time periods for noisy training data allows us to build classifiers that better generalize to out-of-domain data. Using location-based data, we build representations that can be used to classify student’s mental health status. We then shift towards the goal of better understanding temporal change in mental health. We study how the COVID-19 pandemic led to major changes in the conversations and community structure on mental health forums, and propose a technique to account for seasonal and longitudinal variation to add to the robustness of our findings. We find that at an individual level, announcing a depression diagnosis online corresponds with a reduction in linguistic signals that are indicative of depression. Finally, we study how metrics connected to mental health vary over a one-year period, and how that variation is connected to seasonal depression and many linguistic patterns. This thesis crosses disciplinary bounds, providing insights that can be built upon by computer scientists and social scientists in the pursuit of improving global mental health.
Information Flow in Interaction Networks
Creators: name: Stojmirović, Aleksandar
name: Yu, Yi-Kuo
Publisher: name: arXiv
Year: 2011
Subjects: subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: Interaction networks, consisting of agents linked by their interactions, are ubiquitous across many disciplines of modern science. Many methods of analysis of interaction networks have been proposed, mainly concentrating on node degree distribution or aiming to discover clusters of agents that are very strongly connected between themselves. These methods are principally based on graph-theory or machine learning. We present a mathematically simple formalism for modelling context-specific information propagation in interaction networks based on random walks. The context is provided by selection of sources and destinations of information and by use of potential functions that direct the flow towards the destinations. We also use the concept of dissipation to model the aging of information as it diffuses from its source. Using examples from yeast protein-protein interaction networks and some of the histone acetyltransferases involved in control of transcription, we demonstrate the utility of the concepts and the mathematical constructs introduced in this paper.
description: 30 pages, 5 figures. This paper was published in 2007 in Journal of Computational Biology. The version posted here does not include post peer-review changes
The meaning of an education : lifelong learning and the blues
Creators: name: Mitchell, Lindsay C.
Publisher: name: University of British Columbia
Year: 2010

description: All knowledge is individually constructed and contextually situated. Simply stated, different things mean different things to different people, under different circumstances, in different places, and at different times. What then is the meaning of an education? Pragmatic philosophy holds the meaning of something to be intrinsically associated with its functional purpose or effect. Accordingly, it "is" what it "does." Education is thus commonly viewed as a way of instructing children and young persons in preparation for their making informed career choices leading to positive and productive participation in mainstream society as responsible adults. Current definitions include the upgrading, retraining and re-certification of mature workers. Long considered a pipeline to social and material prosperity, education is generally programmed to succeed. But no two learners are the same, and everyone’s experience is unique. What about the less well served, the ones that don’t fit in — the ones flushed out the system’s other end? What meaning does education hold for them? This exercise examines one such experience — my own.
Examining collaborative learning in an online course
Creators: name: Jahng, Namsook
Publisher: name: University of British Columbia
Year: 2010

description: The purpose of this dissertation research was to examine collaborative learning processes during a project-based small group activity in a graduate online course. The specific research questions were: (1) How can group collaboration be assessed quantitatively? (2) What factors hinder or facilitate small group collaboration? (3) Which participation behaviours in whole group discussions before entering small groups are associated with small group collaboration? I developed an analytical framework, the Small Group Collaborative Learning Model (SGCLM), for assessing small group collaboration during project-based activity by modifying the Community of Inquiry model (Garrison, Anderson, & Archer, 2000) in combination with the online interaction learning model (Benbunan-Fich, Hiltz, & Harasim, 2005) which used the input-process-output (IPO) framework (McGrath, 1964, 1984; McGrath, Arrow, & Berdahl, 2000). Based on the SGCLM, I analyzed 2,029 messages (732 messages from small group forums and 1297 messages from the whole group discussions by twenty four students enrolled for 13 weeks). The data were coded into three communication categories (cognitive, social, and managerial) as well as communication directions (sender and receiver). For the data analysis, multiple methodological approaches (content analysis, social network analysis, and qualitative analysis) were employed. Collaboration in six small groups was assessed by three quantitative indices in terms of a group’s communication quantity, group members’ participation equality, and a group’s information sharedness. Following the quantitative assessment, a qualitative examination of the collaboration processes was conducted to identify the specific problems indicated by the quantitative indices. Finally, statistical analyses were performed on students’ participation behaviours before entering the small groups to discover whether these behaviours were related to more/less collaboration in the context of the small groups. I conclude that the three indices can be helpful for researchers, instructors, and course designers who aim at assessing and facilitating project-based small group collaborations in terms of more active communication, more democratic contributions, and more open communication. The collaboration indices can be a useful rubric for instructors to capture potential problems during small group activities and to provide support for the groups. Limitations and suggestions for future research are discussed.
Bounded characteristic classes and flat bundles
Creators: name: Chatterji, Indira
name: Cornulier, Yves
name: Mislin, Guido
name: Pittet, Christophe
Publisher: name: arXiv
Year: 2012
Subjects: subject: Algebraic Topology (math.AT)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: Primary: 57T10, 55R40, Secondary: 20F65, 53C23, 22E15

description: Let G be a connected Lie group, G^d the underlying discrete group, and BG, BG^d their classifying spaces. Let R denote the radical of G. We show that all classes in the image of the canonical map in cohomology H^*(BG,R)->H^*(BG^d,R) are bounded if and only if the derived group [R,R] is simply connected. We also give equivalent conditions in terms of stable commutator length and distortion.
description: 12 pages, no figure
Assessing viability and stress tolerance in multi-species probiotic products
Creators: name: Pereira, Joanna Valanie
Publisher: name: Macquarie University
Year: 2023
Subjects: Other education not elsewhere classified

description: Probiotic products are expected to contain abundant populations of viable microorganisms that can tolerate environmental stressors. Industry standards for determining viability rely on the plate counting method. However, this cannot enumerate metabolically active yet unculturable bacteria. Therefore, this study developed flow cytometry-based protocols for enumeration of probiotic bacteria and compared plate counting and flow cytometry techniques for their ability to determine the impact of storage temperatures and gastrointestinal digestion on microbial cell viability of multi-species probiotic product IBS Relief®. Flow cytometry protocols were optimized using Lactobacillus rhamnosus isolated from IBS Relief®. Product viable cell counts were determined using both techniques, utilizing SYTOXTM Green staining to distinguish membrane compromised and intact cells. Flow cytometry routinely resulted in significantly higher intact cell counts than plate counting. Flow cytometry assays showed low temperatures had minimal impacts on cell survivability, while exposure to 37ºC and 50ºC led to 28% and 67% reduction of intact cells, respectively. Similarly, conditions mimicking gastrointestinal digestion (pepsin and bile salts assays), led to 54% and 43% reduction of intact cells, respectively. This work demonstrates that flow cytometry is suitable for rapid and accurate enumeration of viable cells in mixed-species probiotics and has the potential to replace plate counting.
Post-Newtonian effects of planetary gravity on the perihelion shift
Creators: name: Yamada, Kei
name: Asada, Hideki
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider a coplanar system comprised of a massive central body (a star), a less massive secondary (a planet) on a circular orbit, and a test particle on a bound orbit exterior to that of the secondary. The gravitational pull exerted on the test particle by the secondary acts as a small perturbation, wherefore the trajectory of the particle can be described as an ellipse of a precessing perihelion. While the apsidal motion is defined overwhelmingly by the Newtonian portion of the secondary's gravity, the post-Newtonian portion, too, brings its tiny input. We explore whether this input may be of any astrophysical relevance in the next few decades. We demonstrate that the overall post-Newtonian input of the secondary's gravity can be split into two parts. One can be expressed via the orbital angular momentum of the secondary, another via its orbital radius. Despite some moderately large numerical factors showing up in the expressions for these two parts, the resulting post-Newtonian contributions from the secondary's gravity into the apsidal motion of the test particle turn out to be small enough to be neglected in the near-future measurements.
description: 5 pages, 1 figure, 1 table; accepted by MNRAS
Torrenticolidae
Creators: name: Pešić, Vladimir
name: Chatterjee, Tapas
name: Das, Mrinal Kumar
name: Bordoloi, Sabitry
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Torrenticolidae

description: Family Torrenticolidae
description: Published as part of Pešić, Vladimir, Chatterjee, Tapas, Das, Mrinal Kumar & Bordoloi, Sabitry, 2013, A new species of water mite (Acari, Hydrachnidia) from Assam, India, found in the gut contents of the fish Botia dario (Botiidae), pp. 454-462 in Zootaxa 3746 (3) on page 455, DOI: 10.11646/zootaxa.3746.3.4, http://zenodo.org/record/216047
Five-lepton and six-lepton signatures from production of neutral triplet scalars in the Higgs Triplet Model
Creators: name: Akeroyd, A. G.
name: Moretti, S.
name: Sugiyama, Hiroaki
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The neutral triplet scalars (H^0, A^0) in the Higgs Triplet Model (HTM) are difficult to detect at the LHC for the case of mass degeneracy with the singly charged (H^+) and doubly charged (H^++) scalars. A non-zero value of a specific quartic coupling in the scalar potential removes this degeneracy, and positive values of this coupling would give rise to the mass hierarchy m_{A^0,H^0} > m_{H^+} > m_{H^++}. In this scenario the decays H^0-> H^+ W^* and A^0-> H^+ W^*, followed by H^+ -> H^{++} W^*, can proceed with large branching ratios, even for small mass splittings among the triplet scalars. Such a cascade process would lead to production of H^{++}H^{--} accompanied by several virtual W bosons, and would provide a way of observing H^0 and A^0 with a signature which is different from that of the conventional production process for doubly charged scalars, q qbar -> γ^*, Z^* -> H^{++}H^{--}. Assuming the decay H^{++} to l^+ l^+, we quantify the magnitude of the five-lepton and six-lepton signals in these channels, which have essentially negligible backgrounds at the LHC.
description: 19 pages, 13 figures
Formation of mixed paragenesis diamonds during multistage growth – constraints from in situ δ 13C–δ 15N–[N]  analyses of Koidu diamonds
Creators: Lai, Mei Yan
Stachel, Thomas
Stern, Richard A.
Hardman, Matthew F.
Pearson, D. Graham
Harris, Jeff W.
Publisher: name: University of Alberta Library
Year: 2022

Abstract

Inclusion-bearing diamonds from the Koidu kimberlite complex, Sierra Leone (West African Craton) were analyzed in situ for carbon and nitrogen isotope compositions, nitrogen concentrations and nitrogen aggregation states. In a suite of 105 diamonds, 78% contain eclogitic mineral inclusions, 17% contain peridotitic mineral inclusions, and 5% − an unusually high proportion − contain co-occurring eclogitic and peridotitic mineral inclusions indicating a mixed paragenesis. Major and trace element compositions of mineral inclusions from two mixed paragenesis diamonds (one with omphacite + Mg-chromite, the other with eclogitic garnet + forsteritic olivine) were determined. The presence of positive Eu anomalies in centrally located omphacite and eclogitic garnet inclusions indicates derivation from subducted protoliths, formed as igneous cumulates in lower oceanic crust. Mg-chromite (Cr# 85.5; Mg# 65.2) and olivine (Mg# 94.5) inclusions, located in outer portions of the mixed paragenesis diamonds, have compositions indicative of derivation from strongly depleted cratonic peridotites. Given that the olivine Mg# of 94.5 is the highest reported to date for the West African Craton, the eclogitic and peridotitic inclusions in these mixed paragenesis diamonds cannot have precipitated during infiltration of peridotitic substrates by eclogite-derived fluids, as the consequent fluid-rock interaction should lead to Mg# lower than that for the original peridotitic diamond substrate. The different origins of eclogitic and peridotitic inclusions could be explained by physical transport of their host diamonds from eclogitic into peridotitic substrates, possibly along high-strain shear zones, before renewed diamond growth.

Based on the δ13C–δ15N systematics of the entire inclusion-bearing diamond suite from Koidu, three major compositional clusters are identified. Cluster 1 (eclogitic diamond cores; δ13C = –33.2 to −14.4‰ and δ15N = −5.3 to +10.1‰) bears the isotopic signature of recycled crustal material (± a mantle component). Cluster 2 (peridotitic diamonds and including the core of a diamond containing omphacite + Mg-chromite; δ13C = −6.0 to −1.1‰ and δ15N = −4.2 to +9.7‰) likely involves mixing of carbon and nitrogen from subducted and mantle sources. Cluster 3 (rims of eclogitic diamonds and including the eclogitic garnet + olivine included diamond and the rim of the omphacite + Mg-chromite included diamond; δ13C = −7.8 to −3.6‰ and δ15N = −7.9 to −2.1‰) matches convecting mantle-derived fluids/melts. The distinct isotopic signatures of the three diamond clusters, together with differences in nitrogen aggregation and cathodoluminescence response between diamond cores and rims, suggest episodic diamond growth during multiple fluid/melt pulses.
title: Besondere Bestimmungen der Prüfungsordnung für den Masterstudiengang Lehramt an Berufskollegs mit der beruflichen Fachrichtung Elektrotechnik an der Universität Paderborn : vom 22. Juli 2016
Creators: name: Universität Paderborn
Publisher: name: UB-PAD - Paderborn University Library
Year: 2016
Subjects: subject: Sozialwissenschaften
subject: Bildung und Erziehung
subject: Hochschulbildung

description: Amtliche Mitteilungen / Universität Paderborn
title: Besondere Bestimmungen der Prüfungsordnung für den Masterstudiengang Lehramt an Berufskollegs mit der Großen beruflichen Fachrichtung Elektrotechnik an der Universität Paderborn : vom 22. Juli 2016
Creators: name: Universität Paderborn
Publisher: name: UB-PAD - Paderborn University Library
Year: 2016
Subjects: subject: Sozialwissenschaften
subject: Bildung und Erziehung
subject: Hochschulbildung

description: Amtliche Mitteilungen / Universität Paderborn
Principal realization of twisted Yangians Y(g_N)
Creators: name: Jing, Naihuan
name: Liu, Ming
Publisher: name: arXiv
Year: 2012
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 17B37, 17B65, 16T25

description: We give the principal realization of the twisted Yangians of orthogonal and symplectic types. The new bases are interpreted in terms of discrete Fourier transform over the cyclic group Z_N.
description: 15 pages
Computer Assisted Medical Imaging: From Research to Clinical Application
Creators: name: Hahn, Horst Karl
Publisher: name: Diagnostic Pathology
Year: 2016

description: Evolution or revolution? Medical imaging is in a transition from a qualitative to a fully digital, quantitative discipline with fast growing numbers of images and increasing need for multimodal, multidisciplinary assessment. Computer assistance is a key ingredient to efficiency, safety, and quality of care in this domain. With the availability of prior scans in digital format, and with the diversification of the clinical application domains, both data complexity and requests for specialized and integrated tools are rapidly increasing. We will compare radiological imaging with the situation we currently face in digital pathology and discuss major implications and challenges for the future development of computer assisted medical imaging as key technology for modern healthcare. We cover both methodological research and clinical adaptation, ranging from modular and prototypical software integration to prospective clinical evaluation and medical device product integration. For any clinical use of new solutions, quality assurance is performed according to the guidelines defined by the FDA and other regulatory bodies, which represents a particular challenge for novel data driven and self-learning software systems. In addition, decentralized infrastructures including cloud computing will support efficient collaborative research. Medical image computing, quantitative analysis, auto- mated detection of clinically relevant findings, and computerized classification of disease patterns is expected to have major impact on solutions and workflows used in future clinical routine and in large clinical trials. For digital pathology, the automated and robust combination of information across multiple slides will be a key success factor. A major challenge rests on the barriers and costs of validation of a variety of new solutions and their integration into the routine clinical workflow.
description: Diagnostic Pathology, Vol 1 No 8 (2016): 13. European Congress on Digital Pathology
title: Besondere Bestimmungen der Prüfungsordnung für den Masterstudiengang Lehramt an Berufskollegs mit der Kleinen beruflichen Fachrichtung Automatisierungstechnik an der Universität Paderborn : vom 22. Juli 2016
Creators: name: Universität Paderborn
Publisher: name: UB-PAD - Paderborn University Library
Year: 2016
Subjects: subject: Sozialwissenschaften
subject: Bildung und Erziehung
subject: Hochschulbildung

description: Amtliche Mitteilungen / Universität Paderborn
Robust Estimations of Survival Function for Weibull Distribution
Creators: name: Karagöz, Derya
name: Ata Tutkun, Nihal
Publisher: name: Statistica
Year: 2021

description: The aim of this study is to estimate the robust survival function for the Weibull distribution. Since the survival function of Weibull distribution is based on the parameters, we consider two robust and explicit Weibull parameter estimators proposed by Boudt et al. (2011). The quantile and the quantile least squares which are all robust to censored data is used as an alternative to the maximum likelihood estimation of the Weibull parameters. The proposed estimators are applied to Hodgin’s disease data which produces smaller variances for the robust survival function. The advantage of new methods is that they are numerically explicit in applications. Monte Carlo simulation is performed to compare the behaviours of the proposed robust estimators in the presence of right, left and interval censored observations considering different censoring rates. The simulation results show that the proposed robust estimators are better than the maximum likelihood estimator.
description: Statistica, Vol. 81 No. 1 (2021)
Investigating mechanisms of laser pulse-induced reflectivity modulations in photoacoustic remote sensing with a 10 million frames-per-second camera
Creators: Haven, Nathaniel J. M.
Martell, Matthew T.
Li, Haoyang
Hogan, James D.
Zemp, Roger J.
Publisher: name: University of Alberta Library
Year: 2023

Photoacoustic remote sensing has been recently developed as an all-optical imaging modality capable of imaging a variety of endogenous contrast agents label-free. Initially predicted laser pulse-induced refractive index perturbation-based interrogation beam reflectivity modulations have been found to be orders of magnitude smaller than those typically observed experimentally. In this report we utilize a 10 million frames-per-second camera to further investigate these predicted reflectivity modulations, while also exploring other potential mechanisms of laser pulse-induced reflectivity modulations. Laser-induced motion is demonstrated both laterally for gold wires suspended and submerged in air and water, respectively, and carbon fibers submerged in water, and axial motion is observed in gold wires submerged in a depth gradient of intralipid solution. This laser-induced sample motion is anticipated to cause reflectivity modulations local to the interrogation beam profile in microscopy set-ups. Non-motion-based maximum intensity modulations of 3% are also observed in gold wires submerged in water, indicating the presence of the originally predicted reflectivity modulations. Overall, these observations are important as they provide a widefield view of laser-pulse interactions unavailable in previous point scanning-based photoacoustic remote sensing microscopy configurations, where observed mechanisms occur on time-scales orders of magnitude faster than equivalent field of view point scanning capabilities.
Prehistorische Bewoning In Brugge: Vroege-Midden Bronstijd
Creators: name: Verhaeghe, F.
name: Hillewaert, Bieke
Publisher: name: Zenodo
Year: 1986
Subjects: archaeology, Bruges

description: Tijdens opgravingen uitgevoerd door de Dienst Stadsarcheologie van Brugge werd tussen de Oude Gentweg en de Katelijnestraat prehistorisch materiaal in situ aangetrojjen. Op het pleistoceen zand werden twee lagen aangesneden waarin een betrekkelijk grote hoeveelheid scherven werd gerekupereerd. Het betreft goed gebakken handgemaakt aardewerk, verschraald met schervengruis en kwarts. Enkele rand en en bodemfragmenten wijzen op trechter- tot cylindervormige halzen en bodems met Iicht afgezette voet. Hoewel duidelijke vergelijkingen ontbreken blijkt een datering in de vroege en de midden

bronstijd aanneembaar.
The Zografos-Balakrishnan Lindley Distribution: Properties and Applications
Creators: name: Irshad, Muhammed Rasheed
name: D'cruz, Veena
name: Maya, Radhakumari
Publisher: name: Statistica
Year: 2021

description: The Lindley distribution was proposed in the context of Bayesian statistics as a counter example of fiducial statistics. In this paper, we propose Zografos Balakrishnan Lindley (ZBL) distribution in which Lindley distribution is a special case. Some properties of the new distribution is obtained such as moments, hazard rate function, reliability function etc. The parameters are estimated using the method of maximum likelihood. Finally an application of the proposed distribution to a real data set is illustrated and it is concluded that Zogarfos Balakrishnan Lindley (ZBL) distribution provides better fit than other classical distributions.
description: Statistica, Vol. 81 No. 1 (2021)
Low angular momentum flow model for Sgr A*
Creators: name: Okuda, Toru
name: Molteni, Diego
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We examine the low angular momentum flow model for Sgr A* using two-dimensional hydrodynamical calculations based on the parameters of the specific angular momentum and total energy estimated in the recent analysis of stellar wind of nearby stars around Sgr A*. The accretion flow with the plausible parameters is non-stationary and an irregularly oscillating shock is formed in the inner region of a few tens to a hundred and sixty Schwarzschild radii. Due to the oscillating shock, the luminosity and the mass-outflow rate are modulated by several per cent to a factor of 5 and a factor of 2-7, respectively, on time-scales of an hour to ten days. The flows are highly advected and the radiative efficiency of the accreting matter into radiation is very low, 10^{-5}--$10^{-3}, and the input accretion rate of 4.0* 10^{-6} solar mass/yr results in the observed luminosities -- 10^{36} erg/s of Sgr A* if a two-temperature model and the synchrotron emission are taken into account. The mass-outflow rate of the gas originating in the post-shock region increases with the increasing input specific angular momentum and ranges from a few to 99 per cent of the input accreting matter, depending on the input angular momentum. The oscillating shock is necessarily triggered if the specific angular momentum and the specific energy belong to or are located just nearby in the range of parameters responsible for a stationary shock in rotating inviscid and adiabatic accretion flow. The time variability may be relevant to the flare activity of Sgr A*.
description: 11 pages, 13 figures
Enhancing the understanding of entropy through computation
Creators: name: Salagaram, Trisha
name: Chetty, Nithaya
Publisher: name: arXiv
Year: 2011
Subjects: subject: Computational Physics (physics.comp-ph)
subject: Popular Physics (physics.pop-ph)
subject: FOS: Physical sciences

description: We devise a hierarchy of computational algorithms to enumerate the microstates of a system comprising N independent, distinguishable particles. An important challenge is to cope with integers that increase exponentially with system size, and which very quickly become too large to be addressed by the computer. A related problem is that the computational time for the most obvious brute-force method scales exponentially with the system size which makes it difficult to study the system in the large N limit. Our methods address these issues in a systematic and hierarchical manner. Our methods are very general and applicable to a wide class of problems such as harmonic oscillators, free particles, spin J particles, etc. and a range of other models for which there are no analytical solutions, for example, a system with single particle energy spectrum given by ε(p,q) = ε0 (p^2 + q^4), where p and q are non-negative integers and so on. Working within the microcanonical ensemble, our methods enable one to directly monitor the approach to the thermodynamic limit (N \rightarrow \infty), and in so doing, the equivalence with the canonical ensemble is made more manifest. Various thermodynamic quantities as a function of N may be computed using our methods; in this paper, we focus on the entropy, the chemical potential and the temperature.
description: Trisha Salagaram and Nithaya Chetty, "Enhancing the understanding of entropy through computation" Am. J. Phys.' (in press)
Characterization of Generalized Distribution by Doubly Truncated Moment
Creators: name: Athar, Haseeb
name: Abdel-Aty, Yahia
name: Ali, Mohd. Almech
Publisher: name: Statistica
Year: 2021

description: In this paper characterization properties based on conditional expectation of a continuous function of random variable are studied when truncation is from both the sides, left and right. Then, these results are applied to obtain the k-th doubly truncated moment for a general class of distribution. Further, some examples and particular cases based on this general class of distributions are also demonstrated. The results are obtained in simple and explicit manner which also unifies the earlier results obtained by several authors. In the end, simulation study is performed to validate the correctness of theoretical characterization results and then two real life data sets are used to demonstrate the applications of these results.
description: Statistica, Vol. 81 No. 1 (2021)
A Flexible Bathtub-Shaped Failure Time Model: Properties and Associated Inference
Creators: name: Choudhary, Neha
name: Tyagi, Abhishek
name: Singh, Bhupendra
Publisher: name: Statistica
Year: 2021

description: In this study, we introduce an extended version of the modified Weibull distribution with an additional shape parameter, in order to provide more flexibility to its density and the hazard rate function. The distribution is capable of modeling the bathtub-shaped, decreasing, increasing and the constant hazard rate function. The proposed model contains sub-models that are widely used in lifetime data analysis such as the modified Weibull, Chen, extreme value, Weibull, Rayleigh, and exponential distributions. We study its statistical properties which include the hazard rate function, moments and distribution of the order statistics. The parameters involved in the model are estimated by using maximum likelihood and the Bayesian method of estimation. In Bayesian estimation, we assume independent Gamma priors for the parameters and MCMC technique such as the Metropolis-Hastings algorithm within Gibbs sampler has been implemented to obtain the sample-based estimators and the highest posterior density intervals of the parameters. Tierney and Kadane (1986) approximation is also used to obtain Bayes estimators of the parameters. In order to highlight the relative importance of various estimates obtained, a simulation study is carried out. The usefulness of the proposed model is illustrated using two real datasets.
description: Statistica, Vol. 81 No. 1 (2021)
A sign assignment in totally twisted Khovanov homology
Creators: name: Manion, Andrew
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 57M27

description: We lift the characteristic-2 totally twisted Khovanov homology of Roberts and Jaeger to a theory with integer coefficients. The result is a complex computing reduced odd Khovanov homology for knots. This complex is equivalent to a spanning-tree complex whose differential is explicit modulo a sign ambiguity coming from the need to choose a sign assignment in the definition of odd Khovanov homology.
description: 12 pages; 5 figures
AE Aquarii represents a new subclass of Cataclysmic Variables
Creators: name: Ikhsanov, N. R.
name: Beskrovnaya, N. G.
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We analyze properties of the unique nova-like star AE Aquarii identified with a close binary system containing a red dwarf and a very fast rotating magnetized white dwarf. It cannot be assigned to any of the three commonly adopted sub-classes of Cataclysmic Variables: Polars, Intermediate Polars, and Accreting non-magnetized White Dwarfs. Our study has shown that the white dwarf in AE Aqr is in the ejector state and its dipole magnetic moment is $μ~ 1.5 \times 10^{34} G cm^3$. It switched into this state due to intensive mass exchange between the system components during a previous epoch. A high rate of disk accretion onto the white dwarf surface resulted in temporary screening of its magnetic field and spin-up of the white dwarf to its present spin period. Transition of the white dwarf to the ejector state had occurred at a final stage of the spin-up epoch as its magnetic field emerged from the accreted plasma due to diffusion. In the frame of this scenario AE Aqr represents a missing link in the chain of Polars evolution and the white dwarf resembles a recycled pulsar.
description: accepted for publication in Astronomy Reports (July 2012)
Existence And Uniqueness Of Solutions To Dynamic Models With Occasionally Binding Constraints.
Creators: name: Holden, Tom D.
Publisher: name: Zenodo
Year: 2016
Subjects: occasionally binding constraints
zero lower bound
existence
uniqueness
price targeting
Taylor principle
linear complementarity problem

description: We present the first necessary and sufficient conditions for there to be a unique perfect-foresight solution to an otherwise linear dynamic model with occasionally binding constraints, given a fixed terminal condition. We derive further conditions on the existence of a solution in such models. These results give determinacy conditions for models with occasionally binding constraints, much as Blanchard and Kahn (1980) did for linear models. In an application, we show that widely used New Keynesian models with endogenous states possess multiple perfect foresight equilibrium paths when there is a zero lower bound on nominal interest rates, even when agents believe that the central bank will eventually attain its long-run, positive inflation target. This illustrates that a credible long-run inflation target does not render the Taylor principle sufficient for determinacy in the presence of the zero lower bound. However, we show that price level targeting does restore determinacy in these situations.
description: C62
E3
E4
E5
Muth Distribution and Estimation of a Parameter Using Order Statistics
Creators: name: Irshad, Muhammed Rasheed
name: Maya, Radhakumari
name: Arun, Sasikumar Padmini
Publisher: name: Statistica
Year: 2021

description: In this work, we have considered a lifetime distribution namely Muth distribution and pointed out instances where it appears as a good model to study the stochastic nature of the variable under consideration. We have derived the best linear unbiased estimator (BLUE) of the scale parameter of the Muth distribution based on order statistics for some known values of the shape parameter.We have further estimated the scale parameter of Muth distribution by U-statistics based on best linear functions of order statistics as kernels. The efficiency of the BLUE relative to the usual unbiased estimator has been also evaluated. An illustration describing the performance of U-statistics estimation method when compared with the classical maximum likelihood method is also given.
description: Statistica, Vol. 81 No. 1 (2021)
Visualizing Individual Nitrogen Dopants in Monolayer Graphene
Creators: name: Zhao, Liuyan
name: He, Rui
name: Rim, Kwang Taeg
name: Schiros, Theanne
name: Kim, Keun Soo
name: Zhou, Hui
name: Gutiérrez, Christopher
name: Chockalingam, S. P.
name: Arguello, Carlos J.
name: Pálová, Lucia
name: Nordlund, Dennis
name: Hybertsen, Mark S.
name: Reichman, David R.
name: Heinz, Tony F.
name: Kim, Philip
name: Pinczuk, Aron
name: Flynn, George W.
name: Pasupathy, Abhay N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In monolayer graphene, substitutional doping during growth can be used to alter its electronic properties. We used scanning tunneling microscopy (STM), Raman spectroscopy, x-ray spectroscopy, and first principles calculations to characterize individual nitrogen dopants in monolayer graphene grown on a copper substrate. Individual nitrogen atoms were incorporated as graphitic dopants, and a fraction of the extra electron on each nitrogen atom was delocalized into the graphene lattice. The electronic structure of nitrogen-doped graphene was strongly modified only within a few lattice spacings of the site of the nitrogen dopant. These findings show that chemical doping is a promising route to achieving high-quality graphene films with a large carrier concentration.
description: Science 2011
title: Besondere Bestimmungen der Prüfungsordnung für den Masterstudiengang Lehramt an Berufskollegs mit der Kleinen beruflichen Fachrichtung Informationstechnik an der Universität Paderborn : vom 22. Juli 2016
Creators: name: Universität Paderborn
Publisher: name: UB-PAD - Paderborn University Library
Year: 2016
Subjects: subject: Sozialwissenschaften
subject: Bildung und Erziehung
subject: Hochschulbildung

description: Amtliche Mitteilungen / Universität Paderborn