cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Atmospheric visibility and cloud cover forecasting with novel artificial intelligence methods for Fiji's aviation sector
Creators: name: Raj, Shiveel
Publisher: name: University of Southern Queensland
Year: 2024
Subjects: forecasting
visibility
cloud cover
artificial intelligence
aviation

description: Visibility and ceiling are two important meteorological parameters affecting the operation of aircraft, especially during the critical phases of take-off and landing at airports. Apart from being a key factor in safe and efficient flight operations, accurate forecasts of these two meteorological parameters also contribute to improving the economics of air transportation. This Master of Research (MRES) study aims to develop a new forecasting model based on the latest artificial intelligence methods to predict atmospheric visibility and cloud cover (or ‘ceiling’). This study will address existing gaps in the area by advancing the practical application of deep learning with the following three objectives. Firstly, the study adopts the Iterative Input Selection (IIS) feature selection technique to deduce the optimum features for the proposed model from a global pool of features. Secondly, it aims to design and implement the proposed hybrid IIS-LSTM integrated model for a 1-hour forecast horizon and further compare the outcomes with four alternative AI models. Thirdly, the performance of the hybrid IIS-LSTM model is compared with the alternative models using performance evaluation metrics and graphical analysis. The study also elaborates on the suitability of the objective model for practical visibility and ceiling forecasts and discusses limitations to provide recommendations for future research. The objectives are achieved by using aeronautical meteorological data from two international airports in Fiji from 2012 to 2021. The proposed hybrid IIS-LSTM integrated model combines the feature selection characteristics of the IIS algorithm and the effective time series forecasting LSTM model. The model achieved the desired outcomes of the research by isolating key features for each study site. These optimum features maximised the efficiency of the forecasting component of the algorithm by reducing dimensionality and increasing generalisability of the model. The performance of this model showed its reliability in making accurate forecasts and was consistent for both study sites and for both target variables. It achieved the highest agreement metrics (Willmott’s Index) against the comparison model and the lowest error metrics (RMSE). The model’s performance against these benchmark models demonstrated its superiority over these models and further endorses it as a reliable practical tool. Therefore, the research outcomes present the proposed model as a useful practical tool for future implementation in the aviation industry and could enable a better understanding of the visibility and ceiling parameter predictions for this study region in the future.
Produktinformationen auf Lebensmitteln: Zu viel, zu wenig oder genau richtig?
Creators: name: Vey, Franziska
name: Wangerow, Anna
name: Vey, Franziska
name: Wangerow, Anna
Publisher: name: Unknown
Year: 2015
Subjects: subject: Consumer/Household Economics
subject: Food Consumption/Nutrition/Food Safety
subject: Marketing
subject: FOS: Economics and business
subject: Produktinformationen
subject: Informationsbedarf
subject: Information Overload
subject: explorative Studie

description: Produktinformationen auf Lebensmitteln werden von den Konsumenten benötigt, um sich über die Eigenschaften der Produkte zu informieren. Einige Autoren gehen davon aus, dass eine zu hohe Anzahl an Informationen zu einer Überlastung der Konsumenten führt. Mittels qualitativer Studie wurde gezeigt, dass ein Bedarf an Informationen auf Lebensmitteln besteht. Die Verständlichkeit und die Darstellung der Informationen bereiten den Probanden im Allgemeinen größere Probleme als eine zu hohe Informationsmenge.
Tested Left Femur, CK302-12338
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 2023
Subjects: Femur
Radiocarbon Sampling
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Image of a left femur (CK302-12338) with a large sample removed for radiocarbon testing from the cranial diaphysis.
Evading the Infrared Problem of Thermal QCD
Creators: name: Schroder, Y.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Due to asymptotic freedom, QCD is guaranteed to be accessible to perturbative methods at asymptotically high temperatures. However, in 1979 Linde has pointed out the existence of an "infrared wall", beyond which an infinite number of Feynman diagrams contribute. Following a proposal by Braaten and Nieto, it is shown explicitly how the limits to computability that this infrared problem poses can be overcome in the framework of dimensionally reduced effective theories.
description: To appear in the proceedings of SEWM04, Helsinki, Finland, 16-19 Jun 2004
Bone Bead and Grooved and Snapped Distal Metapodial
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 9999
Subjects: Bone Bead
Canid
Metapodial
Grooved and Snapped
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Image of two artifacts, a bone bead and a distal metapodial with the grooving and snap markings on the proximal end. Bead possibly from the same metapodial. Bead catalog number: CK302-19173, Metapodial catalog number: CK302-9930 Original photograph scanned from slide.
Amidophosphine complexes of zirconium and titanium for dinitrogen activation
Creators: name: Morello, Lara
Publisher: name: University of British Columbia
Year: 2010

description: The preparation and reactivity of zirconium and titanium complexes with the macrocyclic P₂N₂ ligand (where P₂N₂ = PhP(CH₂SiMe₂NSiMe₂CH₂)₂PPh) or the chelating NPN ligand (where NPN = PhP(CH₂SiMe₂NPh)₂) are presented. The zirconium dinitrogen complex ([P₂N₂]Zr)₂(μ-η²: η²-N₂) reacts with (p-methyl)phenylacetylene and (p-tert-butyl)phenylacetylene to afford ([P₂N₂]Zr)₂(μ-η²: η²-N₂CH=CH(p-Me-C₆H₄))(μ-C=C(p-Me-C₆H₄)) and ([P₂N₂]Zr)₂(μ-η²: η²-N₂CH=CH(p-[sup t]Bu- C₆H₄))(μ-C=C(p-[sup t]Bu- C₆H₄)), respectively. In both complexes, the bridging alkenylhydrazido unit has a trans-configuration across the C-C double bond. The formation of this new N-C bond is only observed for reactions between ([P₂N₂]Zr)₂(μ-η²: η²-N₂) and terminal arylalkynes. A simple kinetic analysis of the reaction indicates that the rate-determining step does not involve C-H bond cleavage or N-H bond formation. The reduction of [NPN]ZrCl₂(THF) under an atmosphere of N₂ with two equivalents of KC₈ gives ([NPN]ZrTHF)₂(μ-η²: η²-N₂). The THF ligand is labile and can be displaced in solution by pyridine, from which ([NPN]Zrpy)₂(μ-η²: η²-N₂) can be isolated. A third complex, ([NPN]ZrTHF)(μ-η²: η²-N₂)(pyZr[NPN]), is only observed in situ by ³¹P{¹H} and ¹H NMR spectroscopy. The reduction of [P₂N₂]TiCl₂ with two equivalents of KC₈ under an atmosphere of N₂ affords the dinitrogen complex ([P₂N₂]Ti)₂( μ-η²: η²-N₂). This complex does not react with hydrogen or (p-methyl)phenylacetylene. The reaction of [NPN]Li₂ (THF)₂ with TiCl₄ (THF)₂ or TiCl₃ (THF)₃ produces [NPN]TiCl2 or [NPN]TiCl(THF), respectively. Upon reduction of [NPN]TiCl(THF) or [NPN]TiCl₂ with the appropriate number of equivalents of KC₈ under N₂, a phosphinimide complex, ([N(PN)N]Ti)₂, can be isolated, suggesting that the N=N bond of N₂ is cleaved and a new N-P bond is formed as a result of the reduction reaction. This is supported by mass spectrometric data and ³¹P{¹H} NMR spectroscopic data obtained for the reduction of [NPN]TiCl₂ under an atmosphere of ¹⁵N₂.
VAE/WGAN-Based Image Representation Learning For Pose-Preserving Seamless Identity Replacement In Facial Images
Creators: name: Kawai, Hiroki
name: Chen, Jiawei
name: Ishwar, Prakash
name: Konrad, Janusz
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: We present a novel variational generative adversarial network (VGAN) based on Wasserstein loss to learn a latent representation from a face image that is invariant to identity but preserves head-pose information. This facilitates synthesis of a realistic face image with the same head pose as a given input image, but with a different identity. One application of this network is in privacy-sensitive scenarios; after identity replacement in an image, utility, such as head pose, can still be recovered. Extensive experimental validation on synthetic and real human-face image datasets performed under 3 threat scenarios confirms the ability of the proposed network to preserve head pose of the input image, mask the input identity, and synthesize a good-quality realistic face image of a desired identity. We also show that our network can be used to perform pose-preserving identity morphing and identity-preserving pose morphing. The proposed method improves over a recent state-of-the-art method in terms of quantitative metrics as well as synthesized image quality.
description: 6 pages, 5 figures, 2019 IEEE 29th International Workshop on Machine Learning for Signal Processing (MLSP)
Der Weinmarkt in Rheinland-Pfalz - Eine Zeitreihenanalyse der Fassweinwarenströme
Creators: name: Steinschulte, Marianne
name: Steinschulte, Marianne
Publisher: name: Unknown
Year: 2015
Subjects: subject: International Development
subject: International Relations/Trade
subject: Production Economics
subject: Weinwirtschaft
subject: Fassweinmarkt
subject: Warenstromanalyse

description: In der deutschen Weinwirtschaft deckt der Fassweinhandel eine große Menge des Weinmarktes ab und nimmt somit eine herausragende Stellung ein. Für ein besseres Verständnis des komplexen deutschen Weinwirtschaft in dem Spannungsfeld eines liberalen Marktes und einer regulierten heimischen Produktion wurde die Entwicklung in den Jahren 2000 bis 2012 in einer explorativen Datenanalyse der Fasswein-Warenströme analysiert. Die Datengrundlage bildet eine neue Datenbank der Fassweintransporte im Bundesland Rheinland-Pfalz, die zusammen mit den offiziellen Statistiken die Struktur und Entwicklung des Marktes darstellen. Die Bildung eines Zwei-Stufen-Handelsmodells zeigt deutlich die intensive Vernetzung und Arbeitsteilung sowie einen Konzentrationsprozess in der Weinbranche.
Damping of acoustic waves in dilute polymer solutions
Creators: name: Tsori, Yoav
name: de Gennes, Pierre-Gilles
Publisher: name: arXiv
Year: 2004
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The shear viscosity eta_s(w) of dilute polymer solutions (of flexible coils) has been classically measured and interpreted in terms of the Zimm modes. We point out that the longitudinal viscosity eta_l(w) is the sum of two components eta_l=4*eta_s/3+eta_p, where eta_p is due to an effect of pressure on the coil size. We discuss eta_p for a crude model involving a dependence of both the Kuhn length a and the Flory parameter chi on pressure. We find that eta_p is comparable to eta_s for good solvent conditions, but that eta_p should dominate over eta_s near the theta point.
description: 5 pages
Bone Bead and Grooved and Snapped Distal Metapodial with Pencil for Scale
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 9999
Subjects: Bone Bead
Canid
Metapodial
Grooved and Snapped
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Image of two artifacts, a bone bead and a distal metapodial with the grooving and snap markings on the proximal end. Bead possibly from the same metapodial. Pencil added for scale. Bead catalog number: CK302-19173, Metapodial catalog number: CK302-9930 Original photograph scanned from slide.
The Four Space-times Model of Reality
Creators: name: Fontana, Giorgio
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: We live in a 3+1 space-time that is intended as a description of the universe with three space dimensions and one time dimension. Space-time dimensionality seems so natural that it is rarely criticized. Experiments and the highly successful relativistic theories teach us that there are four fundamental dimensions, among them is time that is treated as a special dimension. The specialty of time can be removed, leading to the concept that time is simply a function of four new fundamental dimensions, which have now identical properties, in combination with Lorentz invariance. A model is deduced in which a 4-space, characterized by four space-like coordinates, may host four "equivalent but orthogonal" space-times, each with three spatial coordinates and one temporal coordinate. Coordinates are shared; therefore the 4-space and the four space-times are all in one. Electromagnetic interaction is confined in each space-time and the role of the speed of light appears to be that of a barrier for the electromagnetic interaction. The motion of objects can be described by four-dimensional optics in the 4-space. Each of the four space-times may host a universe and, in agreement with recent observations, the proposed model can be directly applied to problems like the cosmological matter-antimatter asymmetry and dark-matter issues. Space travel may also benefit from the concepts presented.
description: Accepted by Space Technology and Applications International Forum-STAIF 2005. Albuquerque, N.M. 13-17 February 2005 . No funding
Tested Left Mandible, CK302-12385
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 2023
Subjects: Mandible
Artifact Sampling
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Image of a right mandible (CK302-12385) with a large sample removed for testing from the lateral surface.
Ground state and rotational properties of two-dimensional self-bound quantum droplets
Creators: name: Examilioti, P.
name: Kavoulakis, G. M.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider a two-dimensional self-bound quantum droplet, which consists of a mixture of two Bose-Einstein condensates. We start with the ground state, and then turn to the rotational response of this system, in the presence of an external (harmonic) potential. We identify various phases, depending on the atom number, the strength of the external confinement and the angular momentum. These include center of mass excitation, ghost vortices, as well as vortices of single and multiple quantization. According to our results, this is an excellent system for the study of superfluid states.
description: 7 pages, 5 figures
Tested Right Mandible, CK302-12390
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 2023
Subjects: Mandible
Artifact Sampling
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Close up image of the CK302-12390 sampling.
INNOVATIONSAKTIVITÄT IM MOLKEREISEKTOR: EINE ANALYSE AUF BASIS INTERNATIONALER PATENTANMELDUNGEN
Creators: name: Jantke, Corina
name: Sauer, Johannes
name: Jantke, Corina
name: Sauer, Johannes
Publisher: name: Unknown
Year: 2015
Subjects: subject: Agribusiness
subject: International Relations/Trade
subject: Research and Development/Tech Change/Emerging Technologies
subject: Innovationsaktivität
subject: Patente
subject: Technologietrends
subject: Export
subject: Molkereiwirtschaft

description: Schon vor Ende der Milchquote haben deutsche und europäische Molkereien ihre Exportaktivitäten verstärkt. Bei weiterhin steigender Anlieferungsmenge in der EU und weltweit starken Wettbewerbern gilt es bestehende internationale Absatzmärkte zu sichern und weitere zu erschließen. In der Literatur wurde bereits mehrfach über den positiven Zusammenhang zwischen Innovationsaktivität und Exportleistung von Unternehmen insbesondere in Industrienationen berichtet. Sowohl Export als auch Innovationsaktivität werden durch Rahmenbedingungen, wie z. B. Standort/Nation und Branche/Produkt determiniert. Die Auswertung internationaler Patentanmeldungen – als Output-Indikator von Innovationstätigkeit – lässt Rückschlüsse auf die Exportfähigkeit eines nationalen Sektors zu.
Synthetic LISA: Simulating Time Delay Interferometry in a Model LISA
Creators: name: Vallisneri, Michele
Publisher: name: arXiv
Year: 2004
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We report on three numerical experiments on the implementation of Time-Delay Interferometry (TDI) for LISA, performed with Synthetic LISA, a C++/Python package that we developed to simulate the LISA science process at the level of scientific and technical requirements. Specifically, we study the laser-noise residuals left by first-generation TDI when the LISA armlengths have a realistic time dependence; we characterize the armlength-measurements accuracies that are needed to have effective laser-noise cancellation in both first- and second-generation TDI; and we estimate the quantization and telemetry bitdepth needed for the phase measurements. Synthetic LISA generates synthetic time series of the LISA fundamental noises, as filtered through all the TDI observables; it also provides a streamlined module to compute the TDI responses to gravitational waves according to a full model of TDI, including the motion of the LISA array and the temporal and directional dependence of the armlengths. We discuss the theoretical model that underlies the simulation, its implementation, and its use in future investigations on system characterization and data-analysis prototyping for LISA.
description: 18 pages, 14 EPS figures, REVTeX 4. Accepted PRD version. See http://www.vallis.org/syntheticlisa for information on the Synthetic LISA software package
Programmable GLM: Two user-defined links
Creators: name: Guan, Weihua
name: Gutierrez, Roberto G.
name: Guan, Weihua
name: Gutierrez, Roberto G.
Publisher: name: Unknown
Year: 2002
Subjects: subject: Research Methods/ Statistical Methods
subject: GLM
subject: survival analysis
subject: Cox regression
subject: programming

description: With the release of Stata 7, the glm command for fitting generalized linear models underwent a substantial overhaul. Stata 7 glm contains an expanded array of variance estimators, regression diagnostics, and other enhancements. The overhaul took place to coincide with the release of Hardin and Hilbe (2001). With the new glm came a modular design that enables users to program customized link functions, variance functions, and weight functions to be used if Newey-West covariance estimates are desired. Because cases requiring customized link functions are the more prevalent in the literature, only those are considered here. We give two examples where a nonstandard link function is required: the relative survival model of Hakulinen and Tenkanen (1987) and a logistic model that accounts for natural response as described in Collett (2003). The relative ease (over previous versions of Stata) with which these alternate links can be programmed into glm is demonstrated.
Evaluation of the characteristics of Iron (Fe) Metal Powder injected parts using HDPE and Thermoplastic Rubber (TPR)
Creators: name: Silva, Felipe
name: Motta, Clayton André Oliveira Da
name: Souza, José De
name: Schaeffer, Lirio
name: Biehl, Luciano Volcanoglo
Publisher: name: figshare
Year: 2020
Subjects: subject: 91202 Composite and Hybrid Materials
subject: FOS: Materials engineering
subject: 91399 Mechanical Engineering not elsewhere classified
subject: FOS: Mechanical engineering

description: Metal Injection Molding (MIM) is a process of powder metallurgy, similar to the plastic injection process. This process is ideal for obtaining parts of complex geometry, difficult to machinability, small batches with finishing and final dimensions, or not. The MPI, part generation process, has several steps that must be carefully followed to avoid errors that compromise product quality. The objective of this work was to produce parts with different polymers in a binder, High-Density Polyethylene (HDPE), and Thermoplastic Rubber (TPR) and after comparing them. Results obtained in this research showed that the parts injected with HDPE showed no defects after injection. The parts injected with Thermoplastic Rubber offered, according to the obtained results, an excellent mechanical resistance when compared to those that used HDPE.
A Systematic Literature Review of Modern Software Visualization
Creators: name: Chotisarn, Noptanit
name: Merino, Leonel
name: Zheng, Xu
name: Lonapalawong, Supaporn
name: Zhang, Tianye
name: Xu, Mingliang
name: Chen, Wei
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: We report on the state-of-the-art of software visualization. To ensure reproducibility, we adopted the Systematic Literature Review methodology. That is, we analyzed 1440 entries from IEEE Xplore and ACM Digital Library databases. We selected 105 relevant full papers published in 2013-2019, which we classified based on the aspect of the software system that is supported (i.e., structure, behavior, and evolution). For each paper, we extracted main dimensions that characterize software visualizations, such as software engineering tasks, roles of users, information visualization techniques, and media used to display visualizations. We provide researchers in the field an overview of the state-of-the-art in software visualization and highlight research opportunities. We also help developers to identify suitable visualizations for their particular context by matching software visualizations to development concerns and concrete details to obtain available visualization tools.
Evaluation of entropic interaction chromatography media
Creators: name: Coad, Bryan R.
Publisher: name: University of British Columbia
Year: 2010

description: Entropic interaction chromatography (EIC) media were synthesized by aqueous atom transfer radical polymerization (ATRP) of N,N -dimethylacrylamide (DMA) from the surfaces of non-porous and porous matrices. This novel chromatographic medium demonstrated efficient size-based separation of protein mixtures through the entropy change associated with solute partitioning into the layer of polymer attached to the support. Reaction conditions influencing the physical properties of the grafted layer were investigated. The use of "grafting from" initiators on a hydrolyzable ester linkage enabled exhaustive characterization of the grafted layer when cleaved from the surface. Negatively charged sulfate groups on the surface of the support were required for growth of dense polymer brushes and a combination of high surface charge and initiator concentration were necessary for the growth of dense brushes. The molecular weight of the grafts could be controlled by modifying the concentration of DMA used for the polymerization. Low polydispersities for the grafted layer demonstrated that the polymerization was well controlled. Scale up permitted the targeted synthesis of sufficient material grafted with 55.7 kDa grafts of high density (0.164±0.005 chains/nm ²) to be packed into a 30 x 1 cm chromatography column. Evaluation of a wide variety of columns synthesized with varying graft molecular weights or densities revealed that by exercising synthetic control over physical properties of the grafted layer, the selectivity curve could be tuned. Reducing the graft density allowed greater partitioning of high molecular weight solutes, extending the linear range of the selectivity curve. Increasing the graft molecular weight also altered selectivity, but more directly affected column capacity by increasing the volume of the grafted layer. Through the use of modeling studies, it was predicted that the shear force could act to reduce the number of conformations available to chains, increasing their rigidity without significantly altering the thickness of the grafted layer. A reduction in protein partitioning predicted by this situation was observed experimentally. The large scale EIC column has potential application towards rapid desalting applications of bimolecular feeds and the ease by which graft properties can be tuned suggests that the synthesis of custom chromatography media may be possible.
Position space versions of Magueijo-Smolin doubly special relativity proposal and the problem of total momentum
Creators: name: Deriglazov, A. A.
name: Rizzuti, B. F.
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present and discuss two different possibilities to construct position space version for Magueijo-Smolin (MS) doubly special relativity proposal. The first possibility is to start from ordinary special relativity and then to define conserved momentum in special way. It generates MS invariant as well as nonlinear MS transformations on the momentum space, leading to consistent picture for one-particle sector of the theory. The second possibility is based on the following observation. Besides the nonlinear MS transformations, the MS energy-momentum relation is invariant also under some inhomogeneous linear transformations. The latter are induced starting from linearly realized Lorentz group in five-dimensional position space. Particle dynamics and kinematics are formulated starting from the corresponding five-dimensional interval. There is no problem of total momentum in the theory. The formulation admits two observer independent scales, the speed of light, $c$, and $k$ with dimension of velocity. We speculate on different possibilities to relate $k$ with fundamental constants. In particular, expression of $k$ in terms of vacuum energy suggests emergence of (minimum) quantum of mass.
description: Latex twice, 14 pages, revised in accordance with the version publishedin Phys. Rev. D
The clustergram: A graph for visualizing hierarchical and nonhierarchical cluster analyses
Creators: name: Schonlau, Matthias
name: Schonlau, Matthias
Publisher: name: Unknown
Year: 2002
Subjects: subject: Research Methods/ Statistical Methods
subject: dendrogram
subject: tree
subject: clustering
subject: nonhierarchical
subject: large data
subject: asbestos

description: In hierarchical cluster analysis, dendrograms are used to visualize how clusters are formed. I propose an alternative graph called a “clustergram” to examine how cluster members are assigned to clusters as the number of clusters increases. This graph is useful in exploratory analysis for nonhierarchical clustering algorithms such as k-means and for hierarchical cluster algorithms when the number of observations is large enough to make dendrograms impractical. I present the Stata code and give two examples.
From the help desk: Demand system estimation
Creators: name: Poi, Brian P.
name: Poi, Brian P.
Publisher: name: Unknown
Year: 2002
Subjects: subject: Research Methods/ Statistical Methods
subject: nonlinear estimation
subject: maximum likelihood
subject: demand equations

description: This article provides an example illustrating how to use Stata to estimate systems of household demand equations. More generally, the techniques developed here can be used to estimate any system of nonlinear equations using Stata’s maximum likelihood routines.
Investigating Correlations of Automatically Extracted Multimodal Features and Lecture Video Quality
Creators: name: Shi, Jianwei
name: Otto, Christian
name: Hoppe, Anett
name: Holtz, Peter
name: Ewerth, Ralph
Publisher: name: arXiv
Year: 2020
Subjects: subject: Multimedia (cs.MM)
subject: FOS: Computer and information sciences
subject: H.5.1

description: Ranking and recommendation of multimedia content such as videos is usually realized with respect to the relevance to a user query. However, for lecture videos and MOOCs (Massive Open Online Courses) it is not only required to retrieve relevant videos, but particularly to find lecture videos of high quality that facilitate learning, for instance, independent of the video's or speaker's popularity. Thus, metadata about a lecture video's quality are crucial features for learning contexts, e.g., lecture video recommendation in search as learning scenarios. In this paper, we investigate whether automatically extracted features are correlated to quality aspects of a video. A set of scholarly videos from a Mass Open Online Course (MOOC) is analyzed regarding audio, linguistic, and visual features. Furthermore, a set of cross-modal features is proposed which are derived by combining transcripts, audio, video, and slide content. A user study is conducted to investigate the correlations between the automatically collected features and human ratings of quality aspects of a lecture video. Finally, the impact of our features on the knowledge gain of the participants is discussed.
Speaking Stata: On getting functions to do the work
Creators: name: Cox, Nicholas J.
name: Cox, Nicholas J.
Publisher: name: Unknown
Year: 2002
Subjects: subject: Research Methods/ Statistical Methods
subject: functions
subject: egen
subject: strings
subject: percentile ranks
subject: plotting positions
subject: family data

description: Functions in Stata take two main forms, built-in functions that are part of the executable and egen functions written in Stata’s own language. These are surveyed, giving a variety of tips and tricks, and noting the large number of user-written egen functions available for download from the Internet. Two substantial examples, the calculation of percentile ranks and plotting positions, and the calculation of measures summarizing properties of the other members of a group, provide detailed illustrations of egen in action.
Recycled Metal Characterization of Printed Circuit Boards
Creators: name: Tobolski, Eduarda
name: Lottici, Milena Müller
name: Giacomin, Alexandre
name: Souza, José De
name: Moraes, Carlos Alberto Mendes
Publisher: name: figshare
Year: 2020
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering
subject: 91299 Materials Engineering not elsewhere classified
subject: FOS: Materials engineering

description: This paper presents the characterization of electronic components from Printed Circuit Boards (PCBs) and the comparison with the characterization of the printed circuit board without its parts. The question that guides the research is about the possibility of developing a methodology for processing that covers not only the PCBs but also its electronic components. This process is possible through the physical dismantling of the computer, printed circuit board removal, separation of their electronic components for thermal processing, grinding and particle size separation. After the mechanical processing, the chemical steps start with the analysis of x-ray Fluorescence (FRX) that determines the types of metals contained in each granulometric fraction, leaching in aqua regia, which separates the ceramic and polymeric materials of metals, and precipitation of metals using the method of reduction using laboratory, aluminum that retrieves the metals so that they can be reused. The viability of the research is indicated by the scanning electron microscopy analysis, which reveals what kinds of metals have been recovered.
Tested Left Mandible, CK302-12379
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 2023
Subjects: Mandible
Artifact Sampling
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Image of a left mandible (CK302-12379) with large sample removed for testing from the lateral surface.
Productivity improvement in a polishing sector of a metallurgical industry with MASP application
Creators: name: Ederson Benetti Faiz
name: Souza, José De
name: Beluco, Alexandre
name: Medeiros, Jorge Luis Braz
name: Sporket, Frederico
Publisher: name: figshare
Year: 2020
Subjects: subject: Mechanical Engineering
subject: FOS: Mechanical engineering

description: This paper presents the application of the Analysis and Problem Solving Method (MASP) in the reduction of losses and the search for higher productivity of the forged part polishing sector. The decline of the demand for hand tools such as the forged hammer causes a reduction in the utilization of productive capacity and a decrease in the labor employed. The objective of this paper is to identify opportunities for improvements in sanding and polishing line productivity. The purpose also contemplates the organization of the sector to improve performance in the development and maintenance of the company's competitiveness. The methodology used was a case study. From the analysis of losses and the use of quality tools, it was possible to propose inexpensive and straightforward actions, improving the organization of the sector, reducing production times, as well as reducing ergonomic risks.
title: 02_0497
Creators: name: Wesley Baldwin, John
name: Baldwin, John W.
Publisher: name: NAKALA - https://nakala.fr (Huma-Num - CNRS)
publisherIdentifier: https://ror.org/04ces3204
publisherIdentifierScheme: ROR
Year: 2018
Subjects: subject: LaMOP
subject: Laboratoire de Médiévistique Occidentale de Paris

description: L'ensemble de ces notes ont été crée par John Baldwin lors d'une de ses premières périodes de résidence à Paris. Ces documents comprennent tous les magistri qu’il avait pu rencontrer dans ses sources. Aux XIIème et XIIIème siècles, les universités n'existant pas encore, le titre de magister s'il évoque certainement une compétence n'est pas rattaché de façon systématique au passage par les écoles. De surcroît, les magistris sont le plus souvent désignés par leur seul prénom. La lecture de ces données est donc difficile et suppose un long travail pour tenter d'identifier un individu auquel on pourrait rattacher plusieurs mentions. John Baldwin avait donc renoncé à utiliser ces données pour donner un prolongement à sa magnifique étude sur les gradués d'université et leur emploi par les Capétiens et les Plantagenêts. Néanmoins, il a conservé ces données et elles sont potentiellement très utile dans le cadre de Studium, comme le sont toutes les mentions dans les volumes des Fasti Ecclesiae Gallicanae de chanoines portant ce titre de magister sans autres précisions. L'ampleur des dépouillements rend ces données très utiles et nous devons une grande reconnaissance à John Baldwin pour avoir pris la peine de faire photocopier ses fiches et de nous les avoir transmises amicalement.
Les données ainsi que les images des fiches sont accessibles sur le site Internet à l'adresse suivante : http://studium-baldwin.lamop.fr/.
Les transcriptions des fiches ont été effectuées par des étudiants de Paris 1 Panthéon - Sorbonne mais elles n'ont pas été corrigées par la suite.
description: Relation: https://lamop.hypotheses.org/
Improved Constraints on Anisotropic Birefringent Lorentz Invariance and CPT Violation from Broadband Optical Polarimetry of High Redshift Galaxies
Creators: name: Friedman, Andrew S.
name: Gerasimov, Roman
name: Kislat, Fabian
name: Leon, David
name: Stevens, Walker
name: Tytler, David
name: Keating, Brian G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: In the framework of the Standard Model Extension (SME), we present improved constraints on anisotropic Lorentz invariance and Charge-Parity-Time (CPT) violation by searching for astrophysical signals of cosmic vacuum birefringence with broadband optical polarimetry of high redshift astronomical sources, including Active Galactic Nuclei and Gamma-Ray Burst afterglows. We generalize the work in Kislat 2018, which studied the SME mass dimension $d = 4$ case, to arbitrary mass dimension for both the CPT-even and CPT-odd cases. We then present constraints on all 10, 16, and 42 anisotropic birefringent SME coefficients for dimension $d = 4$, $d = 5$, and $d = 6$ models, respectively, using 7554 observations for odd d and 7376 observations for even d of 1278 unique sources on the sky, which, to our knowledge, comprises the most complete catalog of optical polarization from extragalactic sources in the literature to date. Compared to the smaller sample of 44 and 45 broadband optical polarimetry observations analyzed in Kislat 2018 and Kislat and Krawczynski 2017, our dimension $d = 4$ and $d = 5$ average constraints are more sensitive by factors of 35 and 10, corresponding to a reduction in allowed SME parameter space volume for these studies of 15 and 16 orders of magnitude, respectively. Constraints from individual lines of sight can be significantly stronger using spectropolarimetry. Nevertheless, due to the increased number of observations and lines of sight in our catalog, our average $d = 4$ and $d = 5$ broadband constraints are within factors of 2 and 12 of previous constraints using spectropolarimetry from Kislat 2018 and Kislat and Krawczynski 2017, respectively, using an independent data set and an improved analysis method. By contrast, our anisotropic constraints on all 42 birefringent SME coefficients for $d = 6$ are the first to be presented in the literature.
description: 29 pages, 14 figures
The structure of elliptical galaxies in the Virgo cluster. Results from the INT Wide Field Survey
Creators: name: Gavazzi, G.
name: Donati, A.
name: Cucciati, O.
name: Sabatini, S.
name: Boselli, A.
name: Davies, J.
name: Zibetti, S.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report on a complete CCD imaging survey of 226 elliptical galaxies in the North-East quadrant of the Virgo cluster, representative of the properties of giant and dwarf elliptical galaxies in this cluster. We fit their radial light profiles with the Sersic r^(1/n) model of light distribution. We confirm the result of Graham & Guzman (2003) that the apparent dichotomy between E and dE galaxies in the luminosity-_e plane no longer appears when other structural parameters are considered and can be entirely attributed to the onset of "core" galaxies at B_T sim -20.5 mag. When "core" galaxies are not considered, E and dE form a unique family with n linearly increasing with the luminosity. For 90 galaxies we analyze the B-I color indices, both in the nuclear and in the outer regions. Both indices are bluer toward fainter luminosities. We find also that the outer color gradients do not show any significant correlation with the luminosity. The scatter in all color indicators increases significantly toward lower luminosities, e.g. galaxies fainter than B_T sim -15 have a B-I spread 0.5 mag.
description: 21 pages, 14 figures, 2 tables. Accepted for publication on A&A. High resolution figures at http://goldmine.mib.infn.it/papers/WFS_04/WFS_04-frame.html
Instrumental variables and GMM: Estimation and testing
Creators: name: Baum, Christopher F.
name: Schaffer, Mark E.
name: Stillman, Steven
name: Baum, Christopher F.
name: Schaffer, Mark E.
name: Stillman, Steven
Publisher: name: Unknown
Year: 2002
Subjects: subject: Research Methods/ Statistical Methods
subject: instrumental variables
subject: generalized method of moments
subject: endogeneity
subject: heteroskedasticity
subject: overidentifying restrictions
subject: clustering
subject: intra-group correlation

description: We discuss instrumental variables (IV) estimation in the broader context of the generalized method of moments (GMM), and describe an extended IV estimation routine that provides GMM estimates as well as additional diagnostic tests. Stand-alone test procedures for heteroskedasticity, overidentification, and endogeneity in the IV context are also described.
The optimal sequence for reset controllers
Creators: name: Cai, Chengwai
name: Dastjerdi, Ali Ahmadi
name: Saikumar, Niranjan
name: HosseinNia, S. H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: PID controllers cannot satisfy the high performance requirements since they are restricted by the water-bed effect. Thus, the need for a better alternative to linear PID controllers increases due to the rising demands of the high-tech industry. This has led many researchers to explore nonlinear controllers like reset control. Although reset controllers have been widely used to overcome the limitations of linear controllers in literature, the performance of the system varies depending on the relative sequence of controller linear and nonlinear parts. In this paper, the optimal sequence is found using high order sinusoidal input describing functions (HOSIDF). By arranging controller parts according to this strategy, better performance in the sense of precision and control input is achieved. The performance of the proposed sequence is validated on a precision positioning setup. The experimental results demonstrate that the optimal sequence found in theory outperforms other sequences.
Tested Right Mandible, CK302-12390
Creators: name: (:Unkn) Unknown
Publisher: name: University of Wyoming
Year: 2023
Subjects: Mandible
Artifact Sampling
Vore Buffalo Jump
Bison
Bison Jump
Mass Kill Site
Archaeological Site
Northwest Plains Tribes
Sinkhole
Wyoming
Prehistoric
Archaeology

description: Image of a right mandible (CK302-12390) with a large sample removed for testing from the lateral surface.
Intra-class correlation in random-effects models for binary data
Creators: name: Rodriguez, German
name: Elo, Irma
name: Rodriguez, German
name: Elo, Irma
Publisher: name: Unknown
Year: 2002
Subjects: subject: Research Methods/ Statistical Methods
subject: intra-class correlation
subject: random-effects
subject: probit
subject: logit
subject: complementary log-log
subject: Pearson's r
subject: Yule's Q

description: We review the concept of intra-class correlation in random-effects models for binary outcomes as estimated by Stata’s xtprobit, xtlogit, and xtclog. We consider the usual measures of correlation based on a latent variable formulation of these models and note corrections to the last two procedures. We also discuss alternative measures of association based on manifest variables or actual outcomes and introduce a new command xtrho for computing these measures for all three types of models.
Dust distribution around low-mass planets on converging orbits
Creators: name: Marzari, Francesco
name: D'Angelo, Gennaro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Super-Earths can form at large orbital radii and migrate inward due to tidal interactions with the circumstellar disk. In this scenario, convergent migration may occur and lead to the formation of resonant pairs of planets. We explore the conditions under which convergent migration and resonance capture take place, and what dynamical consequences can be expected on the dust distribution surrounding the resonant pair. We combine hydrodynamic planet--disk interaction models with dust evolution calculations to investigate the signatures produced in the dust distribution by a pair of planets in mean-motion resonances. We find that convergent migration takes place when the outer planet is the more massive. However, convergent migration also depends on the local properties of the disk, and divergent migration may result as well. For similar disk parameters, the capture in low degree resonances (e.g., 2:1 or 3:2) is preferred close to the star where the resonance strength can more easily overcome the tidal torques exerted by the gaseous disk. Farther away from the star, convergent migration may result in capture in high degree resonances. The dust distribution shows potentially observable features typically when the planets are trapped in a 2:1 resonance. In other cases, with higher degree resonances (e.g., 5:4 or 6:5) dust features may not be sufficiently pronounced to be easily observable. The degree of resonance established by a pair of super-Earths may be indicative of the location in the disk where capture occurred. There can be significant differences in the dust distribution around a single super-Earth and a pair of super-Earths in resonance.
description: Accepted for publication on Astronomy and Astrophysics
Global Major-Element Maps of Mercury from Four Years of MESSENGER X-Ray Spectrometer Observations
Creators: name: Nittler, Larry R.
name: Frank, Elizabeth A.
name: Weider, Shoshana Z.
name: Crapster-Pregont, Ellen
name: Vorburger, Audrey
name: Starr, Richard D.
name: Solomon, Sean C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The X-Ray Spectrometer (XRS) on the MESSENGER spacecraft provided measurements of major-element ratios across Mercury's surface. We present global maps of Mg/Si, Al/Si, S/Si, Ca/Si, and Fe/Si derived from XRS data collected throughout MESSENGER's orbital mission. We describe the procedures we used to select and filter data and to combine them to make the final maps, which are archived in NASA's Planetary Data System. Areal coverage is variable for the different element-ratio maps, with 100% coverage for Mg/Si and Al/Si, but only 18% coverage for Fe/Si north of 30 $^{\circ}$ N, where the spatial resolution is highest. The spatial resolution is improved over previous maps by 10-15% because of the inclusion of higher-resolution data from late in the mission when the spacecraft periapsis altitude was low. Unlike typical planetary data maps, however, the spatial resolution of the XRS maps can vary from pixel to pixel, and thus care must be taken in interpreting small-scale features. We provide several examples of how the XRS maps can be used to investigate elemental variations in the context of geological features on Mercury, which range in size from single $\sim$100-km-diameter craters to large impact basins. We expect that these maps will provide the basis for and/or contribute to studies of Mercury's origin and geological history for many years to come.
description: Accepted for publication by Icarus. 38 pages, 10 figures in main text, plus 6 supplemental figures
Chromogravity - An Effective Diff(4,R) Gauge for the IR region of QCD
Creators: name: Sijacki, Djordje
Publisher: name: arXiv
Year: 2004
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Previous work on the IR regime approximation of QCD in which the dominant contribution comes from a dressed two-gluon effective metric-like field $G_{μν} = g_{ab} A^{a}_μ A^{b}_ν$ ($g_{ab}$ a color SU(3) metric) is reviewed. The QCD gauge is approximated by effective "chromodiffeomorphisms", i.e. by a gauge theory based on a pseudo-diffeomorphisms group. The second-quantized $G_{μν}$ field, together with the Lorentz generators close on the $\bar{SL}(4,R)$ algebra. This algebra represents a spectrum generating algebra for the set of hadron states of a given flavor - hadronic "manifields" transforming w.r.t. $\bar{SL}(4,R)$ (infinite-dimensional) unitary irreducible representations. The equations of motion for the effective pseudo-gravity are derived from a quadratic action describing Riemannian pseudo-gravity in the presence of shear ($\bar{SL}(4,R)$ covariant) hadronic matter currents. These equations yield $p^{-4}$ propagators, i.e. a linearly rising confining potential $H(r) \sim r$, as well as linear $J \sim m^{2}$ Regge trajectories. The $\bar{SL}(4,R)$ symmetry based dynamical theory for the QCD IR region is successfully applied to hadron resonances. The pseudo-gravity potential reaches over to Nuclear Physics, where its $J^{P} = 2^{+}, 0^{+}$ quanta provide for the ground state excitations of the Arima-Iachello Interacting Boson Model.