cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Effect Of Stellar Flybys On The Perturbation Of Earth’s Orbit
Creators: name: Hobson, Thomas
Publisher: name: University of Lincoln
Year: 2025
Subjects: F500 - Astronomy

description: The effect of stellar flybys on planetary bodies within our solar system is relatively unknown. Research suggests that changes in Earth’s orbit can affect the climatic evolution on our planet. These cycles, dubbed the Milankovitch cycles, have been cited as playing a role in the extinction events in Earth’s history. There is the potential that long term consecutive stellarflybys could alter the Milankovitch cycles. This may be a contributing factor in the extinction events that are associated with the crossing of the spiral arms. This study presents the effects of 34 flyby scenarios on the Earth’s eccentricity and inclination evolution. A number of REBOUND simulations were run over a 15 Myr period, passing stars of various masses at a variety of encounter distances, locations, and inclinations. The numerical models show that although many cases have little impact on the evolution of Earth’s eccentricity and inclination cycles, that coplanar flybys at distances < 50000 AU can change these cycles significantly. The results suggest that consecutive close encounters of stars to our solar system can perturb Earth’s orbit. Therefore, it is plausible that stellar flybys may influence the Milankovitch cycles and play a role in mass extinction events on Earth.
Does Attractiveness Increase Sales Productivity?
Creators: name: Prickett, Robert W.
name: Prickett, Robert W.
Publisher: name: Unknown
Year: 2007
Subjects: subject: Marketing
subject: FOS: Economics and business

description: Previous studies found individuals’ attractiveness or beauty is positively correlated with job success. Is this success due to attractiveness alone, or does attractiveness induce greater productivity? This study was conducted to measure the effects of attractiveness on sales productivity. Data from an undergraduate sales class at Purdue University were used to measure the impact of individuals’ attractiveness on sales revenue. Regression analysis was used with sales revenue as the dependent variable and attractiveness measures as independent variables, along with other variables. An asymmetric impact of attractiveness exists for males and females. More attractive females have higher sales revenues, but beauty is unrelated to sales performance for males.
Malmquist-type theorems for cubic Hamiltonians
Creators: name: Steinmetz, Norbert
Publisher: name: Technische Universität Dortmund
Year: 2021
Subjects: subject: Hamiltonian system
subject: Painlevé differential equation
subject: Painlevé property
subject: Malmquist property
subject: Algebroid function
subject: 520

description: The aim of this paper is to classify the cubic polynomials H(z,x,y)=∑j+k≤3ajk(z)xjyk over the field of algebraic functions such that the corresponding Hamiltonian system x′=Hy, y′=−Hx has at least one transcendental algebroid solution. Ignoring trivial subcases, the investigations essentially lead to several non-trivial Hamiltonians which are closely related to Painlevé’s equations PI, PII, P34, and PIV . Up to normalisation of the leading coefficients, common Hamiltonians are HI:HII/34:HIV:−2y3+12x2−zyx2y−12y2+12zy+κxx2y+xy2+2zxy+2κx+2λy13(x3+y3)+zxy+κx+λy, but the zoo of non-equivalent Hamiltonians turns out to be much larger.
The Physical Interpretation of PT-invariant Potentials
Creators: name: Weigert, Stefan
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A purely imaginary potential can provide a phenomenological description of creation and absorption of quantum mechanical particles. PT-invariance of such a potential ensures that the non-unitary phenomena occur in a balanced manner. In spite of wells and sinks which locally violate the conservation of quantum probability, there is no net get loss or gain of particles. This, in turn, is intuitively consistent with real energy eigenvalues.
description: 4 pages
Additional file 2 of Anomalous AMPK-regulated angiotensin AT1R expression and SIRT1-mediated mitochondrial biogenesis at RVLM in hypertension programming of offspring to maternal high fructose exposure
Creators: name: Yung-Mei Chao
name: Wu, Kay L. H.
name: Pei-Chia Tsai
name: Tain, You-Lin
name: Leu, Steve
name: Wei-Chia Lee
name: Chan, Julie Y. H.
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Inorganic Chemistry
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 2: Figure S1. Representative laser-scanning confocal microscopic images showing the distribution of (A) AT1R, (B) gp91pphox or (C) SOD2 (green fluorescence) in cells that were stained positively for a neuronal marker, neuron-specific nuclear protein (NeuN) (red fluorescence) in RVLM of ND or HFD offspring at age of 12 weeks. Scale bar: 50 μm. Figure S2. Representative gels (insets) and densitometric analysis of results from Western blot analysis showing changes in protein expression of (A) p47phox or p67phox of the NADPH oxidase, (B) SOD1 or SOD3, (C) catalase or GPx, or (D) NOS1–3 in RVLM of ND (n = 6–10) or HFD (n = 6–10) offspring, alone or with additional treatment with a HMG-CoA inhibitor, simvastatin (5 mg·kg− 1·day− 1), administered via gastric gavage at age of 8 weeks for 4 weeks. Analysis was performed on tissues collected bilaterally from individual RVLM at age of 12 weeks. Data on protein expression were normalized to the average ND control value, which is set to 1.0, and are presented as mean ± SEM. No significance difference among all groups in one-way ANOVA. Figure S3. Representative gels (insets) and densitometric analysis of results from Western blot analysis showing changes in protein expression of (A) p-AMPK and (B) SIRT1, as well as (C) ratio between p-AMPK/t-AMPK in RVLM of ND or HFD offspring, alone or with additional treatment with an AT1R antagonist, losartan (3 μg·μL− 1·h− 1), microinfused via a minipump into the cistern magna at age of 8 weeks for 4 weeks. Analysis was performed on tissues collected bilaterally from individual RVLM at age of 12 weeks. Data on protein expression were normalized to the average ND control value, which is set to 1.0, and are presented as mean ± SEM (n = 10 in all groups). *P
Unexpected late-time temperature increase observed in two neutron star crust cooling sources -- XTE~J1701-462 and EXO~0748-676
Creators: name: Parikh, A. S.
name: Wijnands, R.
name: Homan, J.
name: Degenaar, N.
name: Wolvers, B.
name: Ootes, L. S.
name: Page, D.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Transient LMXBs that host neutron stars (NSs) provide excellent laboratories for probing the dense matter physics present in NS crusts. During accretion outbursts in LMXBs, exothermic reactions may heat the NS crust, disrupting the crust-core equilibrium. When the outburst ceases, the crust cools to restore thermal equilibrium with the core. Monitoring this evolution allows us to probe the dense matter physics in the crust. Properties of the deeper crustal layers can be probed at later times after the end of the outburst. We report on the unexpected late-time temperature evolution (>2000 days after the end of their outbursts) of two NSs in LMXBs, XTE J1701-462 and EXO 0748-676. Although both these sources exhibited very different outbursts (in terms of duration and the average accretion rate), they exhibit an unusually steep decay of ~7 eV in the observed effective temperature (occurring in a time span of ~700 days) around ~2000 days after the end of their outbursts. Furthermore, they both showed an even more unexpected rise of ~3 eV in temperature (over a time period of ~500-2000 days) after this steep decay. This rise was significant at the 2.4σ and 8.5σ level for XTE J1701-462 and EXO 0748-676, respectively. The physical explanation for such behaviour is unknown and cannot be straightforwardly be explained within the cooling hypothesis. In addition, this observed evolution cannot be well explained by low-level accretion either without invoking many assumptions. We investigate the potential pathways in the theoretical heating and cooling models that could reproduce this unusual behaviour, which so far has been observed in two crust-cooling sources. Such a temperature increase has not been observed in the other NS crust-cooling sources at similarly late times, although it cannot be excluded that this might be a result of the inadequate sampling obtained at such late times.
description: accepted for publication by A&A letters
PoDIUM - D7.1 Brand Identity and Guidelines
Creators: name: Céline Lefort
name: Nikolaos Tsampieris
name: Lazaros Gkatzikis
Publisher: name: Zenodo
Year: 2024

description: This deliverable has been developed to present the brand identity and guidelines of the PoDIUM project, including the logo, typography, colours, and visual elements to be used in all communication and dissemination materials and activities of the project, among the consortium and with external stakeholders. This document explains the brand rationale and describes the graphic guidelines to be followed by the consortium, including the correct use of the logo, the project’s colours, the typeface to use, as well as the different templates that have been developed. This is important to ensure a strong visual identity for PoDIUM and that the PoDIUM brand is used consistently and coherently by the consortium, which will maximise the impact of the project’s communication.
Additional file 1 of Jealousy in women with migraine: a cross-sectional case-control study
Creators: name: Casteren, Daphne S. Van
name: Willigenburg, Florine A. C. Van
name: MaassenVanDenBrink, Antoinette
name: Terwindt, Gisela M.
Publisher: name: figshare
Year: 2020
Subjects: subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics
subject: Cancer

description: Additional file 1.
Do Farm Credit Customers Prefer Lower Interest Rates or Higher Patronage Payments?
Creators: name: Jorgensen, Quatie
name: Jorgensen, Quatie
Publisher: name: Unknown
Year: 2007
Subjects: Agricultural Finance

description: Farm Credit Services of East Central Oklahoma (FCSECO) is part of a nationwide cooperative that supplies financing for full-time and part-time farmers. FCSECO not only makes loans to farmers but because it is a cooperative, its members/borrowers also benefit from what is known as the patronage payment. The patronage payment is a way of distributing Farm Credit’s profits to its members/borrowers. Since FCSECO is customer-focused and customer-driven, it is essential that the FCSECO Board of Directors knows their customer base and what they desire as a customer. It would benefit FCSECO to determine the substitutability between patronage payments and fixed interest rates. A conjoint survey was conducted on random FCSECO customers. After performing an OLS regression analysis, the results illustrated that the average FCSECO customer values a higher patronage payment more than a lower fixed interest rate on a given loan. This information is valuable to the FCSECO Board of Directors because it shows which attribute the average FCSECO customer has a preference towards. Since the average FCSECO customer greatly values the patronage payment, the FCSECO Board of Directors could use the patronage payment to its advantage in securing new loans.
The Effect Of Stellar Flybys On The Perturbation Of Earth’s Orbit
Creators: name: Hobson, Thomas
Publisher: name: University of Lincoln
Year: 2024
Subjects: F500 - Astronomy

description: The effect of stellar flybys on planetary bodies within our solar system is relatively unknown. Research suggests that changes in Earth’s orbit can affect the climatic evolution on our planet. These cycles, dubbed the Milankovitch cycles, have been cited as playing a role in the extinction events in Earth’s history. There is the potential that long term consecutive stellarflybys could alter the Milankovitch cycles. This may be a contributing factor in the extinction events that are associated with the crossing of the spiral arms. This study presents the effects of 34 flyby scenarios on the Earth’s eccentricity and inclination evolution. A number of REBOUND simulations were run over a 15 Myr period, passing stars of various masses at a variety of encounter distances, locations, and inclinations. The numerical models show that although many cases have little impact on the evolution of Earth’s eccentricity and inclination cycles, that coplanar flybys at distances < 50000 AU can change these cycles significantly. The results suggest that consecutive close encounters of stars to our solar system can perturb Earth’s orbit. Therefore, it is plausible that stellar flybys may influence the Milankovitch cycles and play a role in mass extinction events on Earth.
Cooperatives, Credit Unions, and Social Engagement in Canada
Creators: name: Kennedy, Travis
name: Kennedy, Travis
Publisher: name: Unknown
Year: 2007
Subjects: Community/Rural/Urban Development

description: Co-operatives serve as engines for local economies; generating and retaining local wealth, operating through existing social networks within communities and providing economic opportunities for local people. Is there a correlation between levels of social engagement and the presence of co-operatives and credit unions? Using the Statistics Canada GSS survey, 2003 and Environics Analytics, Business Locations data it is possible to assess the linkages between social engagement and the presence of cooperatives in Canada. Linkages between demographics (including the breakdown of rural/urban co-operatives and credit unions) and social engagement we isolated volunteerism as a dependant variable in logit regressions. It was established that: across Canada, the older people are, if an individual is female, the larger her or his household is, the less TV he or she watches, the more she or he uses internet, the higher the rate of highschool graduation, the more trusting people are of their neighbours, the more rural an area is, the more fully employed people are, the less likely they are to say no to volunteerism. Although, in all provinces the rural areas have higher levels of social engagement, social engagement is not a direct indicator for the existence of higher levels of co-operative businesses.
Bd^0(t)->pi^+pi^- and Bs^0(t)-> K^+ K^- Decays: A Tool to Measure New-Physics Parameters
Creators: name: London, David
name: Matias, Joaquim
name: Virto, Javier
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: If physics beyond the standard model is present in B decays, experimental measurements seem to suggest that it principally affects those processes with significant b->s penguin amplitudes. It was recently argued that, in general, such new-physics (NP) effects can be parametrized in terms of a single NP amplitude A^q and phase Φ_q, for q=u,d,s,c. In this paper, we show that the study of the decays Bs(t) -> K^+ K^- and Bd(t) -> π^+π^- allows one to measure the NP parameters A^u and Φ_u. We examine the implications for this method of the latest experimental results on these decays. If NP is found in Bs(t) -> K^+ K^-, it can be partially identified through measurements of Bs(t)-> K^0 \bar K^0.
description: 12 pages, 2 figures, LaTeX. Changed references
CSNE: Conditional Signed Network Embedding
Creators: name: Mara, Alexandru
name: Mashayekhi, Yoosof
name: Lijffijt, Jefrey
name: De Bie, Tijl
Publisher: name: arXiv
Year: 2020
Subjects: subject: Social and Information Networks (cs.SI)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Signed networks are mathematical structures that encode positive and negative relations between entities such as friend/foe or trust/distrust. Recently, several papers studied the construction of useful low-dimensional representations (embeddings) of these networks for the prediction of missing relations or signs. Existing embedding methods for sign prediction generally enforce different notions of status or balance theories in their optimization function. These theories, however, are often inaccurate or incomplete, which negatively impacts method performance. In this context, we introduce conditional signed network embedding (CSNE). Our probabilistic approach models structural information about the signs in the network separately from fine-grained detail. Structural information is represented in the form of a prior, while the embedding itself is used for capturing fine-grained information. These components are then integrated in a rigorous manner. CSNE's accuracy depends on the existence of sufficiently powerful structural priors for modelling signed networks, currently unavailable in the literature. Thus, as a second main contribution, which we find to be highly valuable in its own right, we also introduce a novel approach to construct priors based on the Maximum Entropy (MaxEnt) principle. These priors can model the \emph{polarity} of nodes (degree to which their links are positive) as well as signed \emph{triangle counts} (a measure of the degree structural balance holds to in a network). Experiments on a variety of real-world networks confirm that CSNE outperforms the state-of-the-art on the task of sign prediction. Moreover, the MaxEnt priors on their own, while less accurate than full CSNE, achieve accuracies competitive with the state-of-the-art at very limited computational cost, thus providing an excellent runtime-accuracy trade-off in resource-constrained situations.
Effect of Calf Health on Feedlot Performance and Carcass Value
Creators: name: Robson, Shana
name: Robson, Shana
Publisher: name: Unknown
Year: 2007
Subjects: Livestock Production/Industries

description: This paper addresses if calf health does affect feedlot performance and carcass value. The physiological aspects of this question as well as a regression analysis to further evaluate this problem will be addressed in this paper. A large set of data that can help to explain this health and value question has been made available for this study. These data were collected from the years 1990 - 2005 from a cattle feeding and carcass program in Coyle, Oklahoma as part of an Oklahoma State University program entitled the OK Steer Feedout (University 2004-2005). The information found in the physiological examination of this question indicates that calf health greatly affects feedlot performance and carcass value. The loss of muscle and fat deposits due to the immune response launched by the calf to fight disease, suggests a loss in marbling and carcass weight. The decrease in appetite creates a lower average daily gain, affecting the out weight of the calf. The symptoms seen as a result of infection affect feedlot performance, yield grade, and quality grade. The extent of the influence of sickness on the characteristics that determine performance characteristics was determined by the regression models. The models indicate medical costs (which indicate sick cattle) negatively affect performance characteristics. To cow/calf producers, this creates the opportunity to provide healthy cattle and to be justified in receiving a premium for their product. For feedlots and stockers, it means a more valuable consistent product, cattle with better average daily gains, and fewer days on feed. Economically, the cattle industry stands to benefit from the promotion of healthy cattle. How much they stand to benefit requires further research.
Additional file 1 of Anomalous AMPK-regulated angiotensin AT1R expression and SIRT1-mediated mitochondrial biogenesis at RVLM in hypertension programming of offspring to maternal high fructose exposure
Creators: name: Yung-Mei Chao
name: Wu, Kay L. H.
name: Pei-Chia Tsai
name: Tain, You-Lin
name: Leu, Steve
name: Wei-Chia Lee
name: Chan, Julie Y. H.
Publisher: name: figshare
Year: 2020
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Inorganic Chemistry
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 1: Table S1. Metabolic indices of offspring to maternal ND or HFD exposure. Table S2. Effect of simvastatin or losartan on metabolic indices of young ND or HFD offspring.
Student views on the culture of STEM research laboratories: Results from an interview study
Creators: name: Hildt, Elisabeth
name: Laas, Kelly
name: Miller, Christine Z.
name: Taylor, Stephanie
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Science Policy

description: In this article, we present the results of 30 ethnographic interviews in which we asked STEM graduate and undergraduate students at a Midwest university in the United States about topics related to the culture of their research group, how group members communicate and interact, and their experience with ethical issues that arise within the laboratory. Here we focus on the culture of research laboratories and describe the key categories that emerged through analysis, including communication, community structure, governance, and collaboration that influence and shape lab culture. We also consider the critical role of the principal investigator (PI) to influence conditions in the lab that facilitate or inhibit lab culture and the subsequent effects on student feelings and behaviors, interpersonal communication, collaboration, work output, and ethics. Our findings suggest that the quality of research and the wellbeing of the lab members depend not only on purely scientific factors and routine research practices but are also dependent on the culture of the lab as it manifests in interpersonal relationships. The interviews reveal the critical role students ascribe to the PI in shaping the lab culture. Based on this study, we suggest how ethical lab cultures might be encouraged.
Policy Brief 1: Intersection of Indigenous Data Sovereignty and Tribal Agriculture Data Needs in the US
Creators: name: Data Lab, Indigenous
name: Cummins, Jewel
name: Russo Carroll, Stephanie
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 300208
subject: Farm management, rural management and agribusiness
classificationCode: 300210
subject: Sustainable agricultural development
classificationCode: 300299
subject: Agriculture, land and farm management not elsewhere classified

description: Indigenous Peoples have always been agriculture data developers and keepers. Acknowledging the importance of Indigenous agriculture data to communities, an eight member Indigenous steering committee representing eight di erent Tribal Nations throughout the United States (US) designed and facilitated the Workshop. Participants shared expertise and experiences on Indigenous agriculture and outlined the data needs of those engaged in Indigenous agriculture practices, both traditional and contemporary. The Workshop explored the landscape of Indigenous agriculture data, current agriculture data needs of Indigenous Peoples in the US, and better collection of Indigenous agriculture data. Informed by a series of facilitated discussions and participant dialogue, the Collaboratory team developed a set of recommendations to improve Indigenous agriculture data through the application of Indigenous Data Sovereignty. The Collaboratory for Indigenous Data Governance convened the virtual workshop, “Past, Present, and Future Indigenous Data Sovereignty Needs in Agriculture Workshop” on November 16-17, 2022.
The Invasibility and Invadedness of Eastern U.S. Forest Types
Creators: name: Riitters, Kurt H.
name: Potter, Kevin
Publisher: name: figshare
Year: 2020
Subjects: subject: 70505 Forestry Pests, Health and Diseases
subject: FOS: Agriculture, forestry and fisheries
subject: 50103 Invasive Species Ecology
subject: FOS: Earth and related environmental sciences

description: Riitters, K.H., and K.M. Potter. 2019. The invasibility and invadedness of Eastern U.S. forest types. Chapter 6 in K.M. Potter and B.L. Conkling, eds., Forest Health Monitoring: National Status, Trends and Analysis, 2018. General Technical Report SRS-239. Asheville, North Carolina: U.S. Department of Agriculture, Forest Service, Southern Research Station. p. 115-124.

Invasive plant species can cause a variety of undesirable changes in forest health simply by altering forest species composition, and a large proportion of rural forest in the Eastern United States already contains harmful invasive plant species. The statistical power of the Forest Inventory and Analysis (FIA) forest inventory system was combined with the predictive power of a plot-level plant invasion model to compare forest types in the Eastern United States with respect to the likelihood that they contain invasive forest plants, and to evaluate the relative roles of public versus private forest ownership for conserving the uninvaded forest area . Half of the total area of 74 forest types was found to be invaded, with invasions almost twice as likely on privately owned land than on publicly owned land. Individual forest types varied widely in terms of historical invasions, but ownership alone was the deciding factor for the most-invaded forest types. There were no forest types for which a remediation focus on public land would be efficient, i.e., consideration of privately owned lands is probably necessary for controlling invasive plants. For the least-invaded forest types, there were several instances for which the efficiency of a conservation focus on either public or private land would depend on the forest type.
Comment on 'Conformal invariance of the zero-vorticity Lagrangian path in 2D turbulence'
Creators: name: Frewer, Michael
name: Khujadze, George
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The current claim by Grebenev et al. [J. Phys. A: Math. Theor. 52, 335501 (2019)], namely that the inviscid and unclosed 2D Lundgren-Monin-Novikov (LMN) equations on a zero-vorticity Lagrangian path admit conformal invariance, is based on a flawed and misleading analysis published earlier by Grebenev et al. (2017). All false results and conclusions made before in the Eulerian picture were now extended by Grebenev et al. (2019) to the Lagrangian picture. Although we have already commented on these errors and consistently refuted their previous study (Frewer & Khujadze, 2018), we deem it necessary to address and discuss these errors again in the new formulation and notation of Grebenev et al. (2019) as it will offer new insights into this issue.
description: 13 pages, 2 lists CAS-Code. Under review in Journal of Physics A: Mathematical and Theoretical. This article draws heavily from arXiv:1802.02490
Identification of neon in FUSE and VLT spectra of extremely hot hydrogen-deficient (pre-) white dwarfs
Creators: name: Werner, K.
name: Rauch, T.
name: Reiff, E.
name: Kruk, J. W.
name: Napiwotzki, R.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: One of the strongest absorption lines observed in far-ultraviolet FUSE spectra of many PG1159 stars remained unidentified up to now. We show that this line, located at 973.3A, stems from NeVII. We also present new optical high-resolution spectra of PG1159 stars, obtained with the ESO VLT, which cover the NeVII 3644A line and a newly identified NeVII multiplet in the 3850-3910A region. We compare the observed neon lines with NLTE models and conclude a substantial neon overabundance in a number of objects. Although a detailed analysis is still to be performed in order to compare quantitatively the abundances with evolutionary theory predictions, this corroborates the idea that the PG1159 stars and their immediate progenitors, the [WC]-type nuclei of planetary nebulae, display intershell matter of their precursor AGB stars. Possibly as the consequence of a late He-shell flash, H-deficient and (s-processed) Fe-depleted matter, that is strongly enriched by 3-alpha-processed elements (C, O, Ne), is dredged up to the surface. Hence, a detailed study of the element abundance patterns in these peculiar stars gives the unique possibility to probe mixing and nucleosynthesis processes in the precursor AGB stars.
description: accepted for publication in A&A, 11 pages, 7 figures
Fast Wave Polarization, Charge Horizons and the Time Evolution of Force-Free Magnetospheres
Creators: name: Punsly, Brian
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Numerical simulations of force-free, degenerate (ffde)pulsar and black hole magnetospheres are often based on 1-D characteristics. In particular, the plasma wave polarizations that can be propagated along the 1-D characteristics determine the time evolution of the entire system. There are two sets of characteristics,corresponding to the fast and Alfven modes. The fast wave is generally considered to be a transverse light wave, however recently it has been claimed that light-like fast waves can transport a longitudinal electric polarization, $E_{\parallel}$, at the speed of light. The implication is quite profound if true, namely that the wrong information has been propagated along the fast characteristics in all previous simulations of force-free magnetospheres. It is shown in this Letter that the light-like fast waves must be transverse and previous simulations are valid. This result is demonstrated by means of a fundamental physical principle (associated with the fact that particles cannot flow faster than the speed of light), there exists a charge horizon in ffde magnetospheres. It is shown that the Alfven critical surfaces in a ffde magnetosphere are both charge and particle horizons, i.e. one way membranes that do not permit traversal by charges nor particles anti-directed to the bulk flow. Since the propagation of a discontinuous change in $E_{\parallel}$ requires a physical surface charge on the wave-face, it is also a one-way membrane for longitudinally polarized waves. Besides justifying previous ffde simulations this result also invalidates previous claims that fast waves can radiate $E_{\parallel}$ from the event horizon of a black hole.
description: Astrophysical Journal Letters in press
title: Creating a Virtual Hierarchy From a Relational Database
Creators: name: Mo, Yucong
Publisher: name: Utah State University
Year: 2024

description: In data management and modeling, the value of the hierarchical model is that it does not require expensive JOIN operations at runtime; once the hierarchy is built, the relationships among data are embedded in the tree-like hierarchical structure, and thus querying data could be much faster than using a relational database. Today most data is stored in relational databases, but if the data were stored in hierarchies, what would these hierarchies look like? And more importantly, would this transition lead to a more efficient database? This thesis explores these questions by introducing a set of algorithms to convert a relational schema to a hierarchy, that is, a tree-like structure. We show that our algorithms minimize space cost for creating tree nodes while preserving all the relationships and constraints in the schema. Finally, we evaluate the hierarchies on a native XML DBMS with a set of queries.
Leading determinants of education attainment
Creators: name: Coelli, Michael B.
Publisher: name: University of British Columbia
Year: 2009

description: The objective of this thesis is to examine more closely the effect of parental income on individual education outcomes. The first paper (Chapter 2) identifies the causal effect of parental income on education. Parental job losses that occur when youth are completing high school have significant negative effects on the university attendance of youth, and increase early school dropout behaviour. This provides evidence of an alarming impact of labour market displacement receiving little prior attention, and of a significant causal parental income effect. Job losses have persistent negative effects on parental income. I estimate a full year-to-year grade transition model to uncover the immediate and lagged effects of parental shocks on the education attendance outcomes of youth, and to test that these shock measures are exogenous. The second paper (Chapter 3) examines the effect of tuition fees on the post-secondary education attendance of youth from different parental income backgrounds. Universities and community colleges in several Canadian provinces increased tuition markedly over the 1990s, while some provincial governments instituted tuition freezes. I employ this fee variation to identify tuition effects. I also estimate the effect of factors influencing the level of rationing of university and community college places on attendance, namely government funding and cohort size, on attendance. Tuition increases markedly lowered the university attendance of low income youth but affected attendance of youth from middle and high income backgrounds much less. Cohort crowding also affected low income youth more negatively than other youth. I employ information on Canadian youth from the Survey of Labour and Income Dynamics (SLID) in these first two papers. The third paper (Chapter 4) examines the effect of individual high school principals on high school graduation probabilities. My co-authors and I employ a unique administrative data set of all grade 12 students in the province of British Columbia in the 1990s. In this province, there was significant turnover of high school principals within schools, from both rotation of principals from school to school, plus from quits and new hires. This rotation permits the isolation of the effect of the school principal from the effect of schools, student peers and the school neighbourhood. The results suggest that principals, and thus schools, can affect graduation rates. We focus particularly on the effect of school principals on youth from low income backgrounds, as identified by family welfare receipt.
Towards fabrication of ordered gallium nanostructures by laser manipulation of neutral atoms: study of self-assembling phenomena
Creators: name: Fazio, B.
name: Marago', O. M.
name: Arimondo, E.
name: Spinella, C.
name: Bongiorno, C.
name: D'Arrigo, G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Surface diffusion has an impact on the lateral resolution of nanostructures in bottom-up atom nanofabrication. In this paper we study the effects of the gallium atoms self-assembled on silicon surfaces (100) patterned with trenches at different slopes. These particular substrate morphologies have been made to enable an effective deposition rate variation along the surface. In this way we experimentally mimic the effect of the atomic flux modulation created by standing wave during an atom nanofabrication experiment. Even if we observe self organization of gallium atoms on the surface, we conclude that the nano-islands are not affected by surface diffusion processes and the effective variation of the deposition rate per unit area is the dominant factor affecting the growth differences along the surface. This result demonstrates that the gallium atoms self-organization should not prevent the observation of a periodic nano-patterning created by atom nano-fabrication techniques.
description: 7 pages, 5 figures, EMRS conference proceed
Group Approach to the Quantization of the Pöschl-Teller dynamics
Creators: name: Aldaya, V.
name: Guerrero, J.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: The quantum dynamics of a particle in the Modified Pöschl-Teller potential is derived from the group $SL(2,R)$ by applying a Group Approach to Quantization (GAQ). The explicit form of the Hamiltonian as well as the ladder operators is found in the enveloping algebra of this basic symmetry group. The present algorithm provides a physical realization of the non-unitary, finite-dimensional, irreducible representations of the $SL(2,R)$ group. The non-unitarity manifests itself in that only half of the states are normalizable, in contrast with the representations of SU(2) where all the states are physical.
description: 17 pages, LaTeX
HelpCOM_old
Creators: name: Annonymous
Publisher: name: Zenodo
Year: 2024

description: Replication Package of HelpCOM

All the Scripts Necessary to replicate this study are under the Scripts folder. (The preferred Python version is 3.10)

The Dataset folder contains the summary generated by each comment-generation technique, as well as the database dumps of our entire database and the sample databases.

The Survey questionnaires are in the survey folder. The Ethics Board of the University of Anonymous approved this survey.
title: Fault analysis in reactive systems using log data
Creators: name: Exenberger, Fabian
Publisher: name: TU Wien
Year: 2019
Subjects: subject: Knowledge Management
subject: Design
subject: stateful

description: Die Identifizierung der Ursachen von Systemausfällen ist ein wichtiger Bestandteil der Entwicklung und Wartung von reaktiven Systemen. Aufgrund der Komplexität solcher Systeme kann dies eine sehr anspruchsvolle Aufgabe sein. Logdaten können bei der Analyse von Fehlern helfen, aber die Unstrukturiertheit dieser Daten sowie ihre schiere Menge machen eine manuelle Analyse oft unmöglich. Automatisierte Verfahren zur Analyse von Logdaten, um die Ursachen von Systemausfällen zu finden, sind daher notwendig. Ich entwickle vier verschiedene solche Methoden, die Hidden Markov Models, Supervised Learning, Automata Learning und eine Visualisierung verwenden, die ich einen "Weighted Sequence Tree"nenne. Ich bewerte die Leistung dieser Methoden anhand von drei verschiedenen Datensätzen, von denen zwei synthetische Datensätze mit unterschiedlichen Eigenschaften sind und einer reale Daten von einem Industriepartner umfasst.
description: Identifying the causes of system failures is an important part of the development and maintenance of reactive systems. Due to the complexity of such systems, this can be a very challenging task. Log data can help analyze failures, but the unstructured nature of this data, as well as its sheer volume, often makes manual analysis infeasible. Automated methods for analyzing log data to find the causes of system failure are therefore necessary. I develop four different such methods, which respectively employ hidden Markov models, supervised learning, automata learning, and a visualization I call a "weighted sequence tree". I evaluate the performance of these methods on three different datasets, of which two are synthetic datasets with different properties, and one is real-life data from an industry partner.
An analytical framework for soil degradation, farming practices, institutions and policy responses
Creators: name: Prager, Katrin
name: Schuler, Johannes
name: Helming, Katharina
name: Zander, Peter
name: Ratinger, Tomas
name: Hagedorn, Konrad
name: Prager, Katrin
name: Schuler, Johannes
name: Helming, Katharina
name: Zander, Peter
name: Ratinger, Tomas
name: Hagedorn, Konrad
Publisher: name: Unknown
Year: 2011
Subjects: subject: Farm Management
subject: Institutional analysis
subject: soil degradation
subject: soil conservation policy
subject: soil conservation measures
subject: farming practices
subject: policy evaluation

description: There is a lack of knowledge about the effectiveness and efficiency of soil conservation policies in agriculture and little understanding of how policy measures should be designed to encourage farmers to adopt soil conservation practices. This paper analyzes institutional settings surrounding agricultural soil management in ten European countries based on the Institutions of Sustainability framework. This framework considers the interdependencies between ecological and social systems, taking into account environmental conditions, farming practices impacting on soil conservation, different types of actors, policies, institutions and governance structures. The purpose of this paper is to describe the analytical framework and the methodology that all case studies are based on, present and discuss compared findings, outline implications for successful soil conservation policy, and draw conclusions on the methodological approach. The case studies focused on the main soil degradation types occurring across Europe which are addressed by a broad range of mandatory and incentive policies. The findings highlight the following issues: i) the need to design policies that target the locally most common soil threats and processes in the light of agricultural management; ii) the need to take farming management constraints into consideration, (iii) the need for good communication and cooperation both between agricultural and environmental authorities as well as between governmental and non-governmental stakeholders; iv) the necessary mix of mandatory and incentive instruments; and v) the need for data and monitoring systems allowing the evaluation of the effectiveness of policies and soil conservation practices.
Revolutionising Medical Supply Chains in the UK: The Role of DrUBER
Creators: name: Sadeghi Esfahlani, Shabnam
name: Simanjuntak, Sarinova
name: Sanaei, Alireza
name: Fraess-Ehrfeld, Alex
Publisher: name: Zenodo
Year: 2025

description: NIHR Cambridge Biomedical Research Centre (BRC) Event
On the Origin of S0 Galaxies
Creators: name: Alvensleben, U. Fritze-v.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: I will review the basic properties of S0 galaxies in the local Universe in relation to both elliptical and spiral galaxies, their neighbours on the Hubble sequence, and also in relation to dwarf spheroidal (dSph) galaxies. This will include colours, luminosities, spectral features, information about the age and metallicity composition of their stellar populations and globular clusters, about their ISM content, as well as kinematic signatures and their implications for central black hole masses and past interaction events, and the number ratios of S0s to other galaxy types in relation to environmental galaxy density. I will point out some caveats as to their morphological discrimination against other classes of galaxies, discuss the role of dust and the wavelength dependence of bulge/disk light ratios. These effects are of importance for investigations into the redshift evolution of S0 galaxies -- both as individual objects and as a population. The various formation and transformation scenarios for S0 and dSph galaxies will be presented and confronted with the available observations.
description: Invited Review, 18 pages, ``BARS 2004'' Conference, South Africa, June 2004, eds.: K. C. Freeman, D. L. Block, I. Puerari, R. Groess, Kluwer, in press
Supplementary Information 7
Creators: name: Romero, Pedro
Publisher: name: figshare
Year: 2020
Subjects: subject: 60411 Population, Ecological and Evolutionary Genetics
subject: FOS: Biological sciences

description: S07. Scopus results of international partner institutions that collaborated with Peruvian ones in the articles from S06, and Subject Areas of the articles.
Measuring the local dark matter density with LAMOST DR5 and Gaia DR2
Creators: name: Guo, Rui
name: Liu, Chao
name: Mao, Shude
name: Xue, Xiang-Xiang
name: Long, R. J.
name: Zhang, Lan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We apply the vertical Jeans equation to the kinematics of Milky Way stars in the solar neighbourhood to measure the local dark matter density. More than 90,000 G- and K-type dwarf stars are selected from the cross-matched sample of LAMOST DR5 and Gaia DR2 for our analyses. The mass models applied consist of a single exponential stellar disc, a razor thin gas disc and a constant dark matter density. We first consider the simplified vertical Jeans equation which ignores the tilt term and assumes a flat rotation curve. Under a Gaussian prior on the total stellar surface density, the local dark matter density inferred from Markov Chain Monte Carlo simulations is $0.0133_{-0.0022}^{+0.0024}\ {\rm M}_{\odot}\,{\rm pc}^{-3}$. The local dark matter densities for subsamples in an azimuthal angle range of $-10^{\circ} < ϕ< 5^{\circ}$ are consistent within their 1$σ$ errors. However, the northern and southern subsamples show a large discrepancy due to plateaux in the northern and southern vertical velocity dispersion profiles. These plateaux may be the cause of the different estimates of the dark matter density between the north and south. Taking the tilt term into account has little effect on the parameter estimations and does not explain the north and south asymmetry. Taking half of the difference of $σ_{z}$ profiles as unknown systematic errors, we then obtain consistent measurements for the northern and southern subsamples. We discuss the influence of the vertical data range, the scale height of the tracer population, the vertical distribution of stars and the sample size on the uncertainty of the determination of the local dark matter density.
description: 19 pages, 15 figures
Detecting gravito-magnetism with rotation of polarization by a gravitational lens
Creators: name: Sereno, M.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We discuss the effects of an isolated gravitational lens on the rotation of the plane of polarization of linearly polarized light rays, the so called gravitational Faraday rotation, in metric theories of gravity. By applying the thin lens approximation, we derive simple expressions for extended, rotating astrophysical systems deflecting electromagnetic radiation from background sources. Higher order corrections and the case of a Kerr black hole are also considered to show how the rotation of polarization is a purely gravito-magnetic effect. Prospects of a future detection of a gravitational Faraday rotation are examined.
description: 5 pages; accepted for publication in MNRAS