cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Electronic transitions of single silicon vacancy centers in the near-infrared spectral region
Creators: name: Neu, Elke
name: Albrecht, Roland
name: Fischer, Martin
name: Gsell, Stefan
name: Schreck, Matthias
name: Becher, Christoph
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Photoluminescence (PL) spectra of single silicon vacancy (SiV) centers frequently feature very narrow room temperature PL lines in the near-infrared (NIR) spectral region, mostly between 820 nm and 840 nm, in addition to the well known zero-phonon-line (ZPL) at approx. 738 nm [E. Neu et al., Phys. Rev. B 84, 205211 (2011)]. We here exemplarily prove for a single SiV center that this NIR PL is due to an additional purely electronic transition (ZPL). For the NIR line at 822.7 nm, we find a room temperature linewidth of 1.4 nm (2.6 meV). The line saturates at similar excitation power as the ZPL. ZPL and NIR line exhibit identical polarization properties. Cross-correlation measurements between the ZPL and the NIR line reveal anti-correlated emission and prove that the lines originate from a single SiV center, furthermore indicating a fast switching between the transitions (0.7 ns). g(2) auto-correlation measurements exclude that the NIR line is a vibronic sideband or that it arises due to a transition from/to a meta-stable (shelving) state.
description: 9 pages, 7 figures, v2 accepted for publication in Phys. Rev. B
After the Big Bang? Obstacles to the emergence of the rule of law in post-communist societies
Creators: name: Hoff, Karla
name: Stiglitz, Joseph E.
Publisher: name: Columbia University
Year: 2002
Subjects: Economics

description: When Russia launched mass privatization, it was widely believed that it would create a powerful constituency for the rule of law. That didn't happen. We present a dynamic equilibrium model of the political demand for the rule of law and show that beneficiaries of mass privatization may not demand the rule of law even if it is the Pareto efficient "rule of the game." The reason is that uncertainty about the legal regime can lead to asset stripping, and stripping can give agents an interest in prolonging the absence of the rule of law.
Contributions to Discrete Mathematics, Vol 5, No 2 (2010)
Creators: name: Faculty Of Science, University Of Calgary
Publisher: name: Faculty of Science, University of Calgary
Year: 2010

description: Strictly chained (p,q)-ary partitions
Polytopes derived from sporadic simple groups
Signed b-matchings and b-edge covers of strong product graphs
Connected domination dot-critical graphs
Freiman's theorem for solvable groups
On the Parity of p(n,3) and p_Ψ(n,3)
The Cops and Robber game on graphs with forbidden (induced) subgraphs
Some Ramsey theorems for finite n-colorable and n-chromatic graphs
Bounds and constructions for n-e.c. tournaments
Homotopy types of independence complexes of forests
Least-squares approximation by a tree distance
Generalized CPR-graphs and applications
Evaluation of the gene encoding the tissue inhibitor of metalloproteinases-3 in various maculopathies
Creators: name: Felbor, U.
name: Doepner, D.
name: Schneider, U.
name: Zrenner, E.
name: Weber, Bernhard H. F.
Publisher: name: Universität Regensburg
Year: 1997
Subjects: subject: 610 Medizin

description: Purpose. Mutations in the gene encoding the tissue inhibitor of metalloproteinases-3 (TIMP3) have been shown previously to cause Sorsby's fundus dystrophy, an autosomal-dominant disorder characterized by extracellular matrix irregularities in Bruch's membrane. To assess the involvement of TIMP3 in a variety of other macular dystrophies, the authors have screened this gene for disease-causing mutations in age-related macular degeneration (AMD), adult vitelliform macular dystrophy (AVMD), central areolar choroidal dystrophy (CACD), syndrome-associated macular dystrophies, cone-rod dystrophy, and a group with unspecified macular degeneration. Methods. Single-stranded conformational analysis of the entire coding region was performed using the polymerase chain reaction and oligonucleotide primers flanking the five exons of the TIMP3 gene as well as the putative promotor region and a highly conserved fragment of the 3'-untranslated region. The authors analyzed a total of 217 patients, including 143 patients with AMD, 28 patients with AVMD, 21 patients with CACD, and 25 patients with other forms of macular dystrophy. Results. In the 217 patients analyzed, the authors have identified one sequence alteration (a G-to-C base change) in the 5'-untranslated region in a patient with AMD. However, the functional consequences of this mutation are not clear. No other disease-causing mutations were found. The authors have characterized a frequent intragenic polymorphism in exon 3 of the TIMP3 gene (heterozygosity = 0.57) that will be useful for genetic linkage or allele sharing analyses or both. Conclusions. The authors' results suggest that TIMP3 is not a major factor in the cause of AMD, AVMD, and CACD. Thus far, Sorsby's fundus dystrophy appears to be the only phenotype known to be associated with mutations in TIMP3.
Averaged Periodogram Spectral Estimation with Long Memory Conditional Heteroscedasticity
Creators: name: Henry, Marc
Publisher: name: Columbia University
Year: 1999
Subjects: Economics

description: Semiparametric spectral methods seem particularly appropriate for the analysis of long financial time series, providing they are robust to a variety of forms of conditional heteroscedasticity, which is generally recognized as a dominant feature of financial returns. This paper analyses the averaged periodogram statistic in the framework of a generalized linear process with (possibly long memory) conditional heteroscedasticity in the innovations. It is shown that the averaged periodogram statistic is appropriate for a symptotically normal estimation of the spectrum of a weakly dependent process at frequency zero and for consistent estimation of long memory and stationary cointegration in strongly dependent processes. The asymptotic results are coupled with extensive small sample investigations of the performance of the estimates considered.
Elasti-city : a study of adaptability across city scales
Creators: name: Medina Laddaga, Alicia
Publisher: name: University of British Columbia
Year: 2011

description: Elasti-city is an urban model generated with the purpose of satisfying current and future needs. Potentiating the dynamic properties of urban environments can transform them into adaptable ones. Understanding the city as an ever-changing environment allows architects and urban designers to read in urban complexity other than its current problematic. Buildings, and by extension cities, that are adaptable can provide solutions to multiple issues, generate vibrant urban life and permit people to mold and transform their surrounding environment.
Contributions to Discrete Mathematics, Vol 6, No 1 (2011)
Creators: name: Faculty Of Science, University Of Calgary
Publisher: name: Faculty of Science, University of Calgary
Year: 2011

description: On a generalization of the Blaschke-Lebesgue theorem for disk-polygons
Option-closed games
Adjusting a conjecture of Erdős
Coefficients of chromatic polynomials and tension polynomials
2L-convex polyominoes: Geometrical aspects
Cones of partial metrics
Claw-freeness, 3-homogeneous subsets of a graph and a reconstruction problem
Dual linear spaces generated by a non-Desarguesian configuration
Partially critical tournaments and partially critical supports
Dark Forces and Light Dark Matter
Creators: name: Hooper, Dan
name: Weiner, Neal
name: Xue, Wei
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We consider a simple class of models in which the dark matter, X, is coupled to a new gauge boson, phi, with a relatively low mass (m_phi \sim 100 MeV-3 GeV). Neither the dark matter nor the new gauge boson have tree-level couplings to the Standard Model. The dark matter in this model annihilates to phi pairs, and for a coupling of g_X \sim 0.06 (m_X/10 GeV)^1/2 yields a thermal relic abundance consistent with the cosmological density of dark matter. The phi's produced in such annihilations decay through a small degree of kinetic mixing with the photon to combinations of Standard Model leptons and mesons. For dark matter with a mass of \sim10 GeV, the shape of the resulting gamma-ray spectrum provides a good fit to that observed from the Galactic Center, and can also provide the very hard electron spectrum required to account for the observed synchrotron emission from the Milky Way's radio filaments. For kinetic mixing near the level naively expected from loop-suppressed operators (epsilon \sim 10^{-4}), the dark matter is predicted to scatter elastically with protons with a cross section consistent with that required to accommodate the signals reported by DAMA/LIBRA, CoGeNT and CRESST-II.
description: 8 pages, 4 figures
New Directions for Neo-logicism
Creators: name: Thomas-Bolduc, Aaron Robert
Publisher: name: Arts
Year: 2018
Subjects: subject: Logicism
subject: Neo-logicism
subject: Logic
subject: Bad Company
subject: Philosophy of Mathematics
subject: Philosophy
subject: FOS: Philosophy, ethics and religion

description: In this dissertation I focus on a program in the philosophy of mathematics known as neo-logicism that is a direct descendant of Frege’s logicist project. That program seeks to reduce mathematical theories to logic and definitions in order to put those theories on stable epistemic and logical footing. The definitions that are of greatest importance are abstraction principles, biconditionals associating identity statements for abstract objects on one side, with equivalence classes on the other. Abstraction principles are important because they provide connections between logic on the one hand, and mathematics and its ontology on the other. Throughout this work, I advocate that the epistemic goals of neo-logicism be taken into account when we’re looking to solve problems that are of central importance to its success. Additionally, each chapter either discusses or advocates for a methodological shift, or sets up and implements a novel methodological position I believe to be broadly beneficial to the neo-logicist project. Chapter 2 traces thinking about the status of higher-order logic through the mid-twentieth century, setting the stage for issues dealt with in later chapters. Chapter 3 asks neo-logicists to look beyond set theory and consider other foundational theories, or something entirely new when looking for reductions of foundational mathematical theories. Chapter 4 is an extended argument involving non-standard analysis showing that Hume’s Principle ought not be considered analytic in Frege’s sense of the termChapters 5 and 6 move away form the (somewhat) historical work in the first three chapters, and set up new strategies for solving central neo-logicist problems by integrating formal and epistemic considerations. Chapter 5 introduces the notion of a canonical equivalence relation via a discussion of content carving. That notion is a particular way of understanding the relationship between equivalence relations and abstracts. Finally, chapter 6 makes use of canonical equivalence relations to introduce a new direction in the search for solutions to the Bad Company objection. As whole, the project can be seen as providing, as the title suggests, new directions that ought to be considered by those wishing to vindicate neo-logicism
Impact of disorder on the 5/2 fractional quantum Hall state
Creators: name: Pan, W.
name: Masuhara, N.
name: Sullivan, N. S.
name: Baldwin, K. W.
name: West, K. W.
name: Pfeiffer, L. N.
name: Tsui, D. C.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We compare the energy gap of the ν=5/2 fractional quantum Hall effect state obtained in conventional high mobility modulation doped quantum well samples with those obtained in high quality GaAs transistors (heterojunction insulated gate field-effect transistors). We are able to identify the different roles that long range and short range disorders play in the 5/2 state and observe that the long range potential fluctuations are more detrimental to the strength of the 5/2 state than short-range potential disorder.
description: PRL 106, 206806 (2011)
Group Incentives for Teachers
Creators: name: Goodman, Sarena
name: Turner, Lesley
Publisher: name: Columbia University
Year: 2009
Subjects: Economics

description: In current debates regarding the future of education, teacher compensation schemes are often criticized for their lack of performance-based pay. Proponents of merit pay for teachers argue that tying teacher salaries to student achievement will induce teachers to focus on the success of their students and stimulate innovation in the school system as a whole. In this paper, we use a randomized policy experiment conducted in the New York City public school system to explore the effects of one group-based pay scheme. We investigate potential impacts of incentive pay over two academic years (2007-2008 and 2008-2009) on student performance on annual math and reading exams, teacher absences, and responses to environmental surveys of teachers and students. We also consider whether the program had differential outcomes on groups within schools that were especially likely to be targeted, given the particular incentive structure of the program. Last, we explore relative impacts on the market for teachers by examining end-of-year teacher turnover and the quality composition of newly hired teachers. In general, we find no significant effects of this program. However, there is some evidence that the program reduced teacher absenteeism in schools with a small number of teachers, and that these effects were weakened in larger schools by the presence of free-riding.
Contributions to Discrete Mathematics, Vol 6, No 2 (2011)
Creators: name: Faculty Of Science, University Of Calgary
Publisher: name: Faculty of Science, University of Calgary
Year: 2011

description: A variant of the bipartite relation theorem and its application to clique graphs
Signed star k-domatic number of a graph
A bijection between noncrossing and nonnesting partitions of types A, B and C
A graph theoretic proof of the complexity of colouring by a local tournament with at least two directed cycles
Cards, permutations, and sums
Strong d-collapsibility
Computation of atomic fibers of Z-linear maps
Contributions to Discrete Mathematics, Vol 7, No 1 (2012)
Creators: name: Faculty Of Science, University Of Calgary
Publisher: name: Faculty of Science, University of Calgary
Year: 2012

description: Deformations of associahedra and visibility graphs
2-generated Cayley digraphs on nilpotent groups have hamiltonian paths
Decoding generalised hyperoctahedral groups and asymptotic analysis of correctible error patterns
Monochromatic even cycles
Notes on the illumination parameters of convex bodies
Packing of points into the unit 6-dimensional cube
On characterizing game-perfect graphs by forbidden induced subgraphs
Beaded partitions with k colors
Complementaries to Kummer's degree seven reciprocity law and a Dickson Diophantine system
Characterizing graph classes by intersections of neighborhoods
Contributions to Discrete Mathematics, Vol 7, No 2 (2012)
Creators: name: Faculty Of Science, University Of Calgary
Publisher: name: Faculty of Science, University of Calgary
Year: 2012

description: Vertex decompositions of two-dimensional complexes and graphs
Some rigid moieties of homogeneous graphs
Domination Value in Graphs
A discrete Faà di Bruno's formula
A continuous variant of the inverse Littlewood-Offord problem for quadratic forms
Frobenius partition theoretic interpretations of some basic series identities
Tournaments with kernels by monochromatic paths
Antichains and counterpoint dichotomies
Algorithms for classifying regular polytopes with a fixed automorphism group
Distinguishing homomorphisms of infinite graphs
Understanding the Transition of Teachers from Game Users to Game Designers
Creators: name: Liu, Yang
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: Teacher designed games
subject: Digital game-based learning
subject: Design thinking
subject: Education--Teacher Training
subject: Education--Technology

description: Video games play an important role in education, having a strong influence on the Net Generation; however, the idea of teachers as designers of digital classroom games to support student learning has not been widely embraced. The purpose of this study was to gain a deeper understanding of internal and external factors that influence teachers’ capacity to teach and inspire them to move from game users to game designers. This mixed-method case study involved a group of teachers who used and/or designed games for students. The four unique case groups were grounded in three cities and four school districts in Alberta, Canada. Qualitative data were collected from five teachers and six school administrators, six student focus group interviews, eight in-class observations, and two teacher-designed games. Quantitative data were collected from one online survey completed by all five participating teachers. First and second cycle data coding and analyses (Saldaña, 2013) were used to answer the following four research questions: 1) What are the key factors that influence teachers in using digital game-based learning environments? 2) What are the key factors that influence teachers in designing digital game-based learning environments)? 3) What are the conditions needed to develop teachers’ capacity to be designers of digital games? 4) What factors influence the transition of teachers from being game users to game designers to support student learning. iii Key findings from the analysis showed that 1) teachers’ passion towards Digital Gamebased Learning (DGBL) played an important role in motivating them not only to use games but design games, and 2) their technical and pedagogical knowledge worked as a foundation to help teachers transition from game users to game designers. The implications of this study are: 1) my research showcased potential opportunities for both pre-service and in-service teachers regarding designing games in the classroom; 2) school administrators my reference my study to provide resources to support teachers’ innovative teaching approaches and encourage them to be risk-takers; and 3) my research offers options for professional developers to develop courses on game design in order to prepare teachers to use/design games in pedagogically sound ways.
Low-energy break in the spectrum of Galactic cosmic rays
Creators: name: Neronov, A.
name: Semikoz, D. V.
name: Taylor, A. M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Measurements of the low energy spectrum of Galactic Cosmic Rays (GCR) by detectors at or near the Earth are affected by Solar modulation. To overcome this difficulty, we consider nearby molecular clouds as GCR detectors outside the Solar system. Using gamma-ray observations of the clouds by the Fermi telescope we derive the spectrum of GCRs in the clouds from the observed gamma-ray emission spectrum. We find that the GCR spectrum has a low energy break with the spectral slope hardening by 1.1+/-0.3 at an energy of 9+/-3 GeV. Detection of a low-energy break enables a measurement of GCR energy density in the interstellar space 0.9+/-0.3 eV/cm3.
description: 5 pages, 3 figures plus Supplemental Material. Accepted for publication in Phys.Rev.Lett
Evaluating the inhibitory effect of eight compounds from Daphne papyracea against the NS3/4A protease of hepatitis C virus
Creators: name: Wei, Ying
name: Yang, Jian
name: Kishore Sakharkar, Meena
name: Wang, Xia
name: Liu, Qin
name: Du, Jiang
name: Zhang, Jing-Jie
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Sociology
subject: FOS: Sociology
subject: Biological Sciences not elsewhere classified
subject: Information Systems not elsewhere classified
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology

description: Hepatitis C virus (HCV) infection is a global threat to human health with an estimated 1.75 million new cases in 2015. Our previous studies showed that the ethyl acetate extraction of Daphne papyracea exhibited an inhibitory effect towards the HCV NS3/4A protease and eight compounds were identified from the extract. In this study, we investigated which of the eight compounds was responsible for the inhibitory effect of the extract against the HCV NS3/4A protease. From both molecular docking and enzyme inhibition studies, (+)-usnic acid was shown to be the most active compound and could be used as a lead compound in developing novel anti-HCV agents.
Optimal Regulator Transparency
Creators: name: Herk, Leonard F.
Publisher: name: Columbia University
Year: 1997
Subjects: Economics

description: Private investment activity is regulated by two semi-independent agencies: an enforcement authority and an appeals authority. Once undertaken, an investment project may be interdicted by the enforcement authority before its final payoff is realized. The investor may refer an interdiction to the appeals authority, who upholds or voids the interdiction according to a privately known rule of law. The appeals authority determines the degree of regulatory transparency by issuing more or less revealing guidelines describing the operation of the rule of law in various circumstances. In this setting, the appeals authority maximizes its ability to extract rents from investors by issuing weakly differentiated guidelines which yield the highest possible rate of interdiction by the enforcement authority, together with the highest possible likelihood that interdiction will be overturned on appeal.
Development and Evaluation of Risk Models to Predict Readmission or Death Following Discharge from an Adult General Systems Intensive Care Unit
Creators: name: Boyd, Jamie
Publisher: name: Cumming School of Medicine
Year: 2018
Subjects: subject: critical care
subject: intensive care unit
subject: transitions of patient care
subject: prediction models
subject: readmission
subject: in-hospital mortality
subject: meta-analysis
subject: logistic regression
subject: Health Care Management

description: Transitions of care from intensive care unit (ICU) to ward are high-risk periods of healthcare delivery associated with ICU readmission and post-ICU mortality. Evidence-based processes for transitions are crucial for improving outcomes. Validated prediction models that include consistently associated risk factors for ICU readmission or post-ICU mortality may help to improve these practices. This mixed-methods thesis was comprised of three distinct phases: 1) systematic review and meta-analysis; 2) development of prediction models for ICU Readmission and Post-ICU Mortality using two approaches (literature-derived coefficients, data-derived coefficients [Derivation Cohort]), 3) validation of the models in an external Validation Cohort. The models for ICU Readmission showed limited discriminative ability whereas the Post-ICU Mortality models were stronger. Developing prediction models using pooled measures of association is a feasible approach, producing similar results to more the traditional data-derived method. Additional investigation to further validate the findings is required.
Push-and-Track: Saving Infrastructure Bandwidth Through Opportunistic Forwarding
Creators: name: Whitbeck, John
name: Lopez, Yoann
name: Leguay, Jeremie
name: Conan, Vania
name: de Amorim, Marcelo Dias
Publisher: name: arXiv
Year: 2012
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: Major wireless operators are nowadays facing network capacity issues in striving to meet the growing demands of mobile users. At the same time, 3G-enabled devices increasingly benefit from ad hoc radio connectivity (e.g., Wi-Fi). In this context of hybrid connectivity, we propose Push-and-track, a content dissemina- tion framework that harnesses ad hoc communication opportunities to minimize the load on the wireless infrastructure while guaranteeing tight delivery delays. It achieves this through a control loop that collects user-sent acknowledgements to determine if new copies need to be reinjected into the network through the 3G interface. Push-and-Track is flexible and can be applied to a variety of scenarios, including periodic message flooding and floating data. For the former, this paper examines multiple strategies to determine how many copies of the content should be injected, when, and to whom; for the latter, it examines the achievable offload ratio depending on the freshness constraints. The short delay-tolerance of common content, such as news or road traffic updates, make them suitable for such a system. Use cases with a long delay-tolerance, such as software updates, are an even better fit. Based on a realistic large-scale vehicular dataset from the city of Bologna composed of more than 10,000 vehicles, we demonstrate that Push-and-Track consistently meets its delivery objectives while reducing the use of the 3G network by about 90%.
description: Accepted for publication in the Pervasive and Mobile Computing journal
Making Movement Matter: Modelling Connectivity with Spatial Interaction Models
Creators: name: Koenig, Shantel Julene
Publisher: name: Arts
Year: 2018
Subjects: subject: connectivity
subject: spatial interaction model
subject: population model
subject: movement
subject: dispersal
subject: matrix heterogeneity
subject: patchy populations
subject: landscape ecology
subject: Conservation
subject: Ecology
subject: FOS: Biological sciences
subject: Environmental Sciences

description: While the idea of landscape connectivity is conceptually straightforward, practically assessing connectivity is substantially more complicated. Behavioural interactions and the composition and configuration of the landscape ultimately determine an animal’s movement between locations; however, when it comes to modelling connectivity, the comprehensive integration of these key determinants into models is lacking. Interestingly, models used by geographers to model human movement and connectivity are centered on the similar key themes of composition and configuration, but also incorporate the components commonly missing in ecological connectivity models. Specifically, spatial interaction models (SIMs) include variables to describe locational traits and offer a model structure that can account for many of the factors that may influence movement across the landscape. Therefore, the aim of this dissertation was to examine to what extent the SIM framework could be adapted and applied to more fully model landscape connectivity. Using both theoretical and empirical approaches, connectivity modelling using SIMs was explored in several ways. A simulation-based study explored the effect that matrix generalization has on assessments of connectivity at both the landscape and patch scale. As well, the ability of SIMs to model the movement landscape was explored using a simulation model and a case study on Ord’s kangaroo rat, and methods for interpreting and assessing model outputs were developed and presented. Overall, SIMs were successful at assessing connectivity and provided new insights into how connectivity varies across landscape and patch scales. SIM outputs showed that as connectivity models were varied, there were no consistent trends or patterns in the differences in assessments, suggesting that connectivity assessments can be highly sensitive to the landscape representation and the model inputs used. Especially when there is uncertainty in the landscape representation or in understanding how a species interacts with the landscape during movement, uncertainty analysis is required, and SIMs provide a meaningful way to do so. Ultimately, and overall, SIMs proved to be a useful, straightforward, and flexible way to model connectivity, especially in cases that warrant incorporating more information than just distance and patch area.
Random paths to stability in the roommate problem
Creators: name: Diamantoudi, Effrosyni
name: Miyagawa, Eiichi
name: Xue, Licun
Publisher: name: Columbia University
Year: 2002
Subjects: Economics

description: This paper studies whether a sequence of myopic blockings leads to a stable matching in the roommate problem. We prove that if a stable matching exists and preferences are strict, then for any unstable matching, there exists a finite sequence of successive myopic blockings leading to a stable matching. This implies that, starting from any unstable matching, the process of allowing a randomly chosen blocking pair to form converges to a stable matching with probability one. This result generalizes those of Roth and Vande Vate (1990) and Chung (2000) under strict preferences.
Fitting dwarf galaxy rotation curves with conformal gravity
Creators: name: O'Brien, James G.
name: Mannheim, Philip D.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We continue our study of the application of the conformal gravity theory to galactic rotation curves. Previously we had studied a varied 111 spiral galaxy sample consisting of high surface brightness galaxies, low surface brightness galaxies and dwarf galaxies. With no free parameters other than galactic mass to light ratios, we had found that the theory is able to account for the systematics that is observed in the entire set of galactic rotation curves without the need for any dark matter whatsoever. In the present paper we extend our study to incorporate a further 27 galaxies of which 25 are dwarf galaxies and provide updated studies of 3 additional galaxies that had been in the original sample, and again without dark matter find fully acceptable fits, save only for just a few galaxies that we find to be somewhat troublesome. Our current study brings to 138 the number of rotation curves of galaxies that have been accounted for by the conformal gravity theory. Since one of the primary ingredients in the theory is a universal contribution to galactic motions coming from matter exterior to the galaxies, and thus independent of them, our study reinforces one of the central concepts of the conformal gravity studies, namely that invoking dark matter should be viewed as being nothing more than an attempt to describe global physics contributions in purely local galactic terms.
description: 19 pages, 37 figures, revtex4. Updated version with 6 new galaxies to bring total in paper to 30 galaxies
A Platform analytical method for intact polysorbates in protein-containing biopharmaceutical products via HPLC-CAD
Creators: name: Carnes, Katie A.
name: Oliver, Lee D.
name: Brown, Timothy A.
name: Delgadillo, Roberto F.
name: Ward, Michelle S.
name: Mortazavi, Sina
name: Morris, Michael J.
name: Shearer, Justin W.
name: Fuller, Joshua S.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biophysics
subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Biotechnology
classificationCode: 39999
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Science Policy

description: Polysorbate (also known as “Tween”) 80 (PS80) is the most common surfactant in biopharmaceuticals. Here, we report a sensitive, and specific platform analytical method using reversed-phase high performance liquid chromatography employing a charged aerosol detector (HPLC-CAD), that offers the ability to quantitate intact PS80 and can distinguish between low recovery of PS80 and degraded PS80 by also monitoring several PS80 degradants which offers multiple improvements over various previously reported polysorbate analytical methods. The method employs protein/monoclonal antibody precipitation and is designed to be a quality control (QC) lab-friendly method. The method is distinguishable from other published methods because the quantification of the PS80 mono-esters is free from interference from known PS80 degradants. The method has demonstrated acceptable accuracy, precision, specificity, and sensitivity through qualification studies. The specificity afforded by the method allows for employment in forced degradation studies to discern kinetic information. Lastly, the method also has promising applications with other polysorbates (PS60, PS40, and all-laurate PS20) and shows acceptable performance with several types of biopharmaceutical proteins.
Enterpreneurs’ Characteristics as a Determinant of MSE Growth in Addis Ababa, Ethiopia
Creators: name: Syoum, Kokeb
Publisher: name: Journal of Science and Sustainable Development
Year: 2016

description: The study evaluated owner manager characteristics as a determinant of MSE growth. Utilizing a self administered questionnaire, data were collected from two sub-cities of Addis Ababa (Addis ketema an Arada sub-city) where large number of MSEs are located and 99 MSE owner/managers were proportionally selected. Analysis of variance was carried out and hypothesis tested to examine the variation in the growth of MSEs with respect to the variation in each of the independent variables. As two dependent variables were used to measure growth in this study, the result shows different statistical value for both of them. The ANOVA and t-test result indicates, there was a significant variation on the growth of MSEs in relation to the variations of gender, work experience and family back ground if growth is measured using asset growth. If growth is measured using employment growth, the difference in experience and family back ground brings difference in growth. But the study showed no significant difference between MSE growth with respect to the variation in the level of education of the owner/ managers whether growth is measured using asset and employment growth. The study found no evidence to support a common perception linking formal higher education with higher incidence of business success and growth
description: Journal of Science and Sustainable Development, Vol. 4 No. 2 (2016)
Bioavailable Strontium from Plants and Diagenesis of Dental Tissues at Olduvai Gorge, Tanzania
Creators: name: Tucker, Laura Lillian
Publisher: name: Arts
Year: 2018
Subjects: subject: strontium
subject: isoscape
subject: diagenesis
subject: Olduvai Gorge
subject: fossil
subject: animal teeth
subject: Archaeology

description: Stable strontium isotope analysis is used to assess the migration and mobility of past populations of people and animals. This study aimed to determine the feasibility of conducting future studies using this method at Olduvai Gorge, Tanzania by determining the variability in biologically-available strontium (87Sr/86Sr) throughout the region from areas with metamorphic and volcanic bedrock, as well as recent unconsolidated lacustrine sediments. This was done by analysing modern plants collected from 33 different localities. As well, the degree to which archaeological animal teeth from Juma’s Korongo, a ~1-million-year-old site at Olduvai Gorge, have been affected by diagenetic alteration was assessed. To do this, the dentine and enamel of the teeth were analysed with and without pre-treatment with weak acetic acid: a protocol used for removing diagenetic strontium from dental specimens. There was no difference in 87Sr/86Sr values of volcanic (n=19) and metamorphic (n=9) sampling localities, but the lacustrine localities (n=5) had significantly higher values. 87Sr/86Sr values tended to decrease moving northeast towards the active volcano Oldoinyo Lengai, a major source of soil constituents for the area. Also, localities where trees were sampled had significantly higher 87Sr/86Sr values than those without them. Despite the homogeneous 87Sr/86Sr values described between metamorphic and volcanic localities, much higher values have been found in the northern extent of Serengeti National Park (Copeland et al., 2012), suggesting that animals who have immigrated into the area from long distances away can be identified as non-local. The animal teeth (n=7), which include zebras, crocodiles, and a hippopotamus, were all from local animals. There was a significant difference between enamel and dentine values after acid washing, suggesting that biogenic 87Sr/86Sr values are preserved in the enamel. These values were consistently higher than the modern bioavailable strontium values, possibly due to environmental differences between the past and present. The results of this study suggest that Olduvai Gorge is a suitable area for future studies using stable strontium isotope analysis, though more work is required to fully understand the inconsistencies between ancient and modern bioavailable strontium.
Determination of vitamins B1 and B6 in infant formula and food supplement samples using magnetic layered double hydroxide nanoadsorbent before liquid chromatography-tandem mass spectrometry
Creators: name: Zamani-Kalajahi, Monireh
name: Abolhassani, Ali
name: Hamidi, Samin
name: Nemati, Mahboob
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
classificationCode: 59999
subject: Environmental Sciences not elsewhere classified
classificationCode: 39999
subject: Chemical Sciences not elsewhere classified
classificationCode: 69999
subject: Biological Sciences not elsewhere classified

description: A magnetic Mg/Fe layered double hydroxide (magnetic LDH) nanocomposite was successfully prepared and used as a suitable adsorbent to simultaneously extract vitamins B1 and B6 from complex infant formula and food supplements. The important parameters affecting the extraction were optimized and the final parameters are as follows; the amount of adsorbent (20 mg), extraction time (6 min), elution time (8 min), and elution solvent ethanol in 750 µL. As-prepared nanoadsorbent was successfully in magnetic solid phase extraction set-up with no hazardous solvents and extraction performed in 6 min. The structure of nanoadsorbnet is lamellar, providing a wide surface to extract the analytes. The quantification of the analytes was accomplished using the liquid chromatography-tandem mass (LC/MS-MS) technique. Under optimum extraction conditions, the linearity ranged from 4 to 1000 ng/mL (vitamin B1) and 20 to 1000 ng/mL (vitamin B6), and the correlation of coefficients (R2) was obtained better than 0.99. The intra-day (n = 3) and inter-day precisions (n = 3 working days) calculated in the form of percent relative standard deviations (%RSDs) were obtained below 10.20%. The proposed method was successfully practiced for analyzing vitamins B1 and B6 in several brands of infant formulas and food supplements.
Effects of technological improvement in the ICT-producing sector on business activity
Creators: name: Hoon, Hian Teck
name: Phelps, Edmund S.
Publisher: name: Columbia University
Year: 2006
Subjects: Commerce

description: It seems to be taken for granted by many commentators that the sharp decline in prices of computers, telecommunications equipment and software resulting from the technological improvements in the information and communications technology (ICT)-producing sector is good for jobs and is a major driving force behind the non-inflationary employment miracle and booming stock market in the latter half of the nineties in the U.S. and their recurrence since 2004. We show that, in our model, a technical improvement in the ICT-producing sector by itself cannot explain a simultaneous increase in employment and a rise in firms' valuation (or Tobin's Q ratio). There are two cases. If the elasticity of equipment price (pI with respect to ICT-producing sector's productivity is less than one, labor's value marginal productivity increases thus pulling up the demand wage and expanding employment. However, the increased output by adding to the capital stock and thus driving down future capital rentals causes a decline in firms' valuation, q per unit, even though Tobin's Q (=q/pI) is up. If the elasticity is greater than one, equipment prices fall so dramatically that labor's value marginal productivity declines, employment in the ICT-using sector expands proportionately more than the increase in capital stock, thus raising future capital rentals, so both firms 'valuation and Tobin's Q rise; but then real demand wage falls and employment contracts. The key to generating a booming stock market alongside employment expansion is to hypothesize that when technical improvement in the ICT-producing sector occurs, the market forms an expectation of future productivity gains to be reaped in the ICT-using sector. Then we can explain not only the stock market boom and associated rise in investment spending and employment in the period 1995-2000 but also the subsequent decline in employment, in Tobin's Q and in investment spending in 2001, with consumption holding up well as productivity gains in the ICT-using sector were realized. An anticipation of a future TFP improvement in the ICT-using sector can once more play the role of raising the stock market.
A Universal Gauge for Thermal Conductivity of Silicon Nanowires With Different Cross Sectional Geometries
Creators: name: Chen, Jie
name: Zhang, Gang
name: Li, Baowen
Publisher: name: arXiv
Year: 2011
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: By using molecular dynamics simulations, we study thermal conductivity of silicon nanowires (SiNWs) with different cross sectional geometries. It is found that thermal conductivity decreases monotonically with the increase of surface-to-volume ratio (SVR). More interestingly, a simple universal linear dependence of thermal conductivity on SVR is observed for SiNWs with modest cross sectional area (larger than 20 nm^2), regardless of the cross sectional geometry. As a result, among different shaped SiNWs with the same cross sectional area, the one with triangular cross section has the lowest thermal conductivity. Our study provides not only a universal gauge for thermal conductivity among different cross sectional geometries, but also a designing guidance to tune thermal conductivity by geometry.
description: 22 pages, 6 figures
Identifying the Optimum Zone for Reducing Drill String Vibrations
Creators: name: Etaje, Darlington Christian
Publisher: name: Graduate Studies
Year: 2018
Subjects: subject: Drill String Vibrations
subject: Engineering--Petroleum

description: This thesis was written to address the vibration problems that occur during drilling operations. Due to the rotational motion effected on the drill string while drilling, vibrations occur, and when these vibrations become excessive, the drill string may oscillate in a manner that could damage the pipes and damage other tools attached to the drill string. Machine learning may be used to identify the vibration prone zones and provide recommendations to the driller to change the operating weight on bit (WOB) and rotation speed (RPM) to achieve drilling efficiency while reducing the possibility of damages downhole. Data received from the rig is processed through a dimension reduction process and then categorized using a decision tree classification method. The rules behind the decision tree was created by reversing conventional ways of curbing vibration problems during drilling operations. In the course of the research, it was discovered that there is a need for additional safety gap away from the usual boundary for vibration problems. Quantitative risk analysis was used to identify this gap. This report explains the process of identifying that safety gap. The machine learning model used throughout this research was trained on recorded downhole data and tested with surface data from the electronic drilling recorder. The reports also highlight the findings from market research done to identify the possibility of deploying this research as a startup in Calgary, Canada. Detailed competitor analysis is shown based on customer discovery and customer validation interviews. This has led to the development of business model canvas which is described in this report. A blue ocean strategy was graphed showing that the startup, “Optimum Zone Identifier, OZI” can be differentiated from competitors by being in a market segment that has unique needs with OZI being the only player fitting this category.
Additional file 3 of The mediating effect of leisure activities in the relationship between depression and cognitive decline in middle age and older adults in Taiwan
Creators: name: Hung, Yu-Chan
name: Lao, Wai-Lam
name: Yeh, Chih-Jung
name: Lee, Meng-Chih
Publisher: name: figshare
Year: 2023
Subjects: subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Mental Health

description: Appendix C. The detailed results for models 0–6 of Table 3.
A DoE-based fast and synchronous quantification of rhein, aceclofenac, and diclofenac by RP-HPLC-DAD method in spiked Wistar rat plasma: application to pharmacokinetic studies
Creators: name: Kazi, Taufik M.
name: Dandagi, Panchaxari M.
name: Biradar, Prakash R.
Publisher: name: Taylor & Francis
Year: 2023
Subjects: subject: Biochemistry
subject: Pharmacology
classificationCode: 39999
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: FOS: Biological sciences
classificationCode: 69999
subject: Biological Sciences not elsewhere classified
subject: Plant Biology

description: A fixed-dose combination of diacerein and aceclofenac (ACF) is commonly used in the treatment of osteoarthritis for their disease-modifying and analgesic effects, respectively. We introduce a simple, fast, sensitive, and green HPLC method for synchronous quantification of rhein (RH) (a primary metabolite of diacerein), ACF, and diclofenac (DL) (an active metabolite of ACF) in rat plasma using fenofibric acid as an internal standard (IS). The chromatographic conditions were optimized using Fractional Factorial and Box-Behnken design. Drugs were extracted by acetonitrile-methanol-based simple protein precipitation technique. The separation was performed on C18 column (Phenomenex, 250 × 4.6 mm), using acetonitrile: phosphate buffer pH 3.5 (60:40, v/v) at a 1 mL/min flow rate in a 10 min run time and detected at 264 nm. As per the USFDA guidelines, the established method was validated. RH, ACF, and DL showed good linearity in the 25–3000, 50–6000, and 50–6000 ng/mL concentration ranges respectively. The precision and accuracy results were found to be well within the acceptable range, with average recovery ranging between 92.27 and 96.10%. The developed method was found to be stable and successfully used to determine the pharmacokinetic parameters in Wistar rats after oral administration of Dycerin A tablet.