cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the design of stable, high performance sigma delta modulators
Creators: name: Hannigan, Brett Christopher
Publisher: name: University of British Columbia
Year: 2019

description: The sigma delta architecture of A/D converters is especially applicable to digitizing most bio-signals. High order single-bit sigma delta modulators provide high resolution and linearity with low circuit complexity but require careful design to avoid unstable states. Many existing methods of designing these systems have few degrees of freedom, rely extensively on simulations, and do not provide guarantees about stability. The problem of designing sigma delta modulators with high performance and a clear indicator of the performance versus stability is addressed in this dissertation. This is done by developing a model of the sigma delta modulator that more accurately represents the system including robustness against the nonlinearities due to the quantizer element. After introducing many stability criteria from literature, those most suited to design are identified and the model adjusted to allow these criteria to be applied. High performance is maintained by using the GKYP lemma to maximize noise rejection in the signal band using a SDP framework that also permits the use of H-infinity, H-2, and l-1 norm-based stability constraints on the system. Several designs using this framework are presented and their relative merits discussed. Examples include an aggressive noise shaping design to compete with existing methods on the basis of performance and designs with guaranteed stability for a range of input signals. The performance-stability trade-off for the different stability constraints using this work is examined and motivated by simulation results.
Distance to Galactic globulars using the near-infrared magnitudes of RR Lyrae stars: IV. The case of M5 (NGC5904)
Creators: name: Coppola, G.
name: Dall'Ora, M.
name: Ripepi, V.
name: Marconi, M.
name: Musella, I.
name: Bono, G.
name: Piersimoni, A. M.
name: Stetson, P. B.
name: Storm, J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present new and accurate near-infrared (NIR) J, K-band time series data for the Galactic globular cluster (GC) M5 = NGC5904. Data were collected with SOFI at the NTT (71 J + 120 K images) and with NICS at the TNG (25 J + 22 K images) and cover two orthogonal strips across the center of the cluster of \approx 5 \times 10 arcmin^{2} each. These data allowed us to derive accurate mean K-band magnitudes for 52 fundamental (RR_{ab}) and 24 first overtone (RR_{c}) RR Lyrae stars. Using this sample of RR Lyrae stars, we find that the slope of the K-band Period Luminosity (PLK) relation (-2.33 \pm 0.08) agrees quite well with similar estimates available in the literature. We also find, using both theoretical and empirical calibrations of the PLK relation, a true distance to M5 of (14.44 \pm 0.02) mag. This distance modulus agrees very well (1σ) with distances based on main sequence fitting method and on kinematic method (14.44 \pm 0.41 mag, \citealt{rees_1996}), while is systematically smaller than the distance based on the white dwarf cooling sequence (14.67 \pm 0.18 mag, \citealt{layden2005}), even if with a difference slightly larger than 1σ. The true distance modulus to M5 based on the PLJ relation (14.50 \pm 0.08 mag) is in quite good agreement with the distance based on the PLK relation further supporting the use of NIR PL relations for RR Lyrae stars to improve the precision of the GC distance scale.
description: 19 pages, 6 figures, accepted for publication in MNRAS
A Measurement of Electrons From Heavy Quarks in p+p Collisions at √sNN = 200 GeV.
Creators: name: Themann, Harry
Publisher: name: Zenodo
Year: 2011
Subjects: qgp
hadron
heavy flavor

description: In this thesis, we present a measurement of high pT single electrons in pp collisions at center of mass energy of 200 GeV from heavy flavor quarks. This was done by exploiting the energy deposition characteristics of both hadrons, principally π’s, and electrons in the electromagnetic calorimeters.
An Empirical Investigation of Personalization Factors on TikTok
Creators: name: Boeker, Maximilian
name: Urman, Aleksandra
Publisher: name: arXiv
Year: 2022
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: Computers and Society (cs.CY)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: TikTok currently is the fastest growing social media platform with over 1 billion active monthly users of which the majority is from generation Z. Arguably, its most important success driver is its recommendation system. Despite the importance of TikTok's algorithm to the platform's success and content distribution, little work has been done on the empirical analysis of the algorithm. Our work lays the foundation to fill this research gap. Using a sock-puppet audit methodology with a custom algorithm developed by us, we tested and analysed the effect of the language and location used to access TikTok, follow- and like-feature, as well as how the recommended content changes as a user watches certain posts longer than others. We provide evidence that all the tested factors influence the content recommended to TikTok users. Further, we identified that the follow-feature has the strongest influence, followed by the like-feature and video view rate. We also discuss the implications of our findings in the context of the formation of filter bubbles on TikTok and the proliferation of problematic content.
description: Accepted for publication at the Web Conference 2022
Reaching the intersection of indigenous and modern
Creators: name: Fresnoza, Eli Paolo
Publisher: name: Royal Roads University
Year: 2021
Subjects: Action Research; Disaster; Indigenous; Ivatan; Knowledge; Modernization

description: Known for their Indigenous knowledge, systems, and practices (IKSPs) in managing disaster risks, the Ivatans of Batanes Province in the Philippines are faced with the pressures of modernizing such generations-old traditions. While noble in intent, the technologically-driven narrative of managing disaster risks idealized by the National Disaster Risk Reduction and Management Council (NDRRMC) brings to question the change it influences on Ivatan Indigenous communities. The intersection between Ivatan IKSPs and the NDRRMC’s initiatives reflected epistemological contrasts of positivist vis-à-vis constructivist approaches that warranted a critical view. Drawing new understanding and knowledge using the critical paradigm required an Action Research-driven methodology. Specific data gathering and collaboration methods included desk research; validation of an Ivatan DRRM IKSP inventory; FGDs and workshops that delved into understanding community and Local DRRM Council perceptions and critiques; and a workshop to craft recommendations for integrating Indigenous and scientific resiliency systems. Research findings pointed out hegemonic, top- down-centric policies that insisted outsider-oriented, technical solutions that were ineffective to the local context and were potentially damaging to traditional cultural systems and practices of resiliency. However, Ivatans were also faced with endogenous agencies such as the strong thrust for modernity through technology that may potentially wane traditional resiliency practices. Outcomes from community workshops also revealed a paradigm shift in society to integrate the scientific and traditional as a continuous evolution of IKSPs and resiliency in light of the increasing threat of climate change disruptions.
Noncommutative Geometric Spaces with Boundary: Spectral Action
Creators: name: Chamseddine, Ali H.
name: Connes, Alain
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study spectral action for Riemannian manifolds with boundary, and then generalize this to noncommutative spaces which are products of a Riemannian manifold times a finite space. We determine the boundary conditions consistent with the hermiticity of the Dirac operator. We then define spectral triples of noncommutative spaces with boundary. In particular we evaluate the spectral action corresponding to the noncommutative space of the standard model and show that the Einstein-Hilbert action gets modified by the addition of the extrinsic curvature terms with the right sign and coefficient necessary for consistency of the Hamiltonian. We also include effects due to the addition of dilaton field.
description: 26 pages
The propagation of transient waves in two-dimensional square lattices
Creators: name: Aleksandrova, Nadezhda I.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Classical Physics (physics.class-ph)
subject: Numerical Analysis (math.NA)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 74J05 (Primary) 74H10, 74H40, 74S20 (Secondary)

description: The aim of this article is to study the attenuation of transient low-frequency waves in 2D lattices in both plane and antiplane problems. The main idea of this article is that analytical solutions to problems of mechanics of discrete periodic media can be obtained by a method of asymptotic inversion of the Laplace and Fourier transforms in the vicinity of the quasi-front of infinitely long waves; moreover, in this method it is possible to take into account the contribution of short waves. Using this method, we obtain asymptotics of perturbations in lattices in plane and antiplane formulations under a local transient load. Besides, we show that equations describing 2D plane motion of a square lattice can be represented in the form of two linearly independent wave equations, each of which contains one unknown function only. By analogy with the theory of elasticity, one equation describes the propagation of shear waves in the lattice, while the other equation describes the propagation of longitudinal waves. As a result, it is shown that, in a homogeneous infinite lattice, a load can be specified in such a manner that either predominantly longitudinal or predominantly shear waves are formed. The problems under study are also solved by a finite difference method. The qualitative and quantitative correspondence of asymptotic and numerical solutions is shown.
description: 36 pages, 20 figures
Entgrenzte Autonomie? Die assistierte Selbsttötung nach der bundesverfassungsgerichtlichen Entscheidung vom 26. Februar 2020, hg. v. Arnd Uhle / Judith Wolf
Creators: name: Koller, Edeltraud
Publisher: name: Theologische Revue
Year: 2023

description: Theologische Revue, Bd. 119 (2023): April
Runaway evaporation for optically dressed atoms
Creators: name: Wilkowski, David
Publisher: name: arXiv
Year: 2010
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: Forced evaporative cooling in a far-off-resonance optical dipole trap is proved to be an efficient method to produce fermionic- or bosonic-degenerated gases. However in most of the experiences, the reduction of the potential height occurs with a diminution of the collision elastic rate. Taking advantage of a long-living excited state, like in two-electron atoms, I propose a new scheme, based on an optical knife, where the forced evaporation can be driven independently of the trap confinement. In this context, the runaway regime might be achieved leading to a substantial improvement of the cooling efficiency. The comparison with the different methods for forced evaporation is discussed in the presence or not of three-body recombination losses.
EFFECT OF PUBLIC INVESTMENT ON ECONOMIC GROWTH IN NIGERIA (2000-2023)
Creators: name: Uzochukwu, Ezekwere   Ph.D.
name: Alohan,, Osayamen Bright
Publisher: name: TOP Journal
Year: 2024
Subjects: Public investment, Infrastructural development Healthcare, and Economic growth

description: This study ascertained the effect of public investment on economic increase in Nigeria, using government investment on health care and infrastructural improvement on economic growth of Nigeria. This study employed Ex Post Facto research layout. Data have been extracted from CBN Statistical Bulletin and the World Bank World Development Indicators. The data encompasses variables together with gross domestic product (GDP), investment on healthcare and investment on infrastructural development from 2000 to 2023. The data analyzed using descriptive statistics and inferential statistics generated from E-Views 9.0 statistical software, using 95% confidence. The study showed that government investment on health care has no significant effect on economic growth in Nigeria. Also government investment on infrastructural development has no significant effect on economic growth in Nigeria. Consequently, findings, it was recommended that to reverse the insignificant effect of health care expenditure on economic growth, government should conduct a comprehensive evaluation of healthcare investments to assess their impact on health outcomes, identify gaps and inefficiencies in the system. On infrastructural improvement, government should identify and address regulatory, bureaucratic and logistical bottlenecks that hinder the success of infrastructural investments
Recomendaciones para el estudio y monitoreo de murciélagos cavernícolas en Costa Rica
Creators: name: Deleva, Stanimira
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 310308
subject: Terrestrial ecology
classificationCode: 410401
subject: Conservation and biodiversity
classificationCode: 310999
subject: Zoology not elsewhere classified

description: El monitoreo regular de los murciélagos es el método más confiable para evaluar su estado de conservación actual y las tendencias de población. Los murciélagos cavernícolas, debido a su tendencia a formar grandes agregaciones en cuevas y otros sitios subterráneos, son excelentes sujetos de investigación. En este documento se presentan un conjunto de metodologías estándar y pautas para investigar y monitorear murciélagos cavernícolas en Costa Rica. Se han seguido metodologías establecidas, con modificaciones adaptadas a las condiciones específicas de nuestro país. Se notaron las especies y se propuso una lista de sitios subterráneos importantes para el monitoreo.Dada la popularidad de la espeleología como actividad al aire libre, el monitoreo de murciélagos puede ser llevado a cabo no solo por investigadores, sino también por espeleólogos, guías turísticos y otros entusiastas, siempre y cuando se sigan las recomendaciones básicas descritas. Además de la metodología, se ofrece información útil sobre las mejores prácticas y protocolos de seguridad. Se recomienda realizar actualizaciones periódicas de este documento para incorporar nuevos datos y métodos de investigación, asegurando su relevancia y efectividad en los esfuerzos de conservación de murciélagos en Costa Rica.
Transmission spectra of multi-dimensional atmospheric simulations: computation and applications
Creators: name: Falco, Aurelien
Publisher: name: Zenodo
Year: 2021

description: Atmospheric retrievals (the inference of atmospheric characteristics such as the pressure and temperature of an exoplanet from an observed spectrum) often rely on a 1D representation of the atmospheres of exoplanets. This simplification is motivated by the low computational requirements of the computation of transmission spectra for 1D atmospheric simulations. This allows us to run such forward models a number of times sufficiently large to use a Bayesian method for the retrieval in question. However, the 1D simplification has been shown to introduce some biases in the case of Ultra Hot Jupiters for example. These biases have been shown using a 3D model. We present here a general framework to compute transmission spectra of 1D, 2D or 3D atmospheric simulations using Pytmosph3R, and TauREx (which has been extended to a 2D model for our convenience). We compare these models and study their convergence, discuss their performance, and show possible applications of multi-dimensional forward models.
A quantum no-reflection theorem and the speeding up of Grover's search algorithm
Creators: name: Kumar, Karthikeyan S.
name: Paraoanu, G. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We prove that it is impossible to built a universal quantum machine that produces reflections about an unknown state. We then point out a connection between this result and the optimality of Grover's search algorithm: if such reflection machines were available, it would be possible to accelerate Grover's search algorithm to exponential speedups.
description: 8 pages, 3 figures
Adaptive active damping methods for DC-AC power-electronic-based systems with constant-power loads
Creators: name: Qu, Zhi
Publisher: name: University of British Columbia
Year: 2019

description: Many electronic loads in fast-developing power systems behave as constant-power loads (CPLs) which are known to exhibit negative incremental impedance and have a destabilizing effect in the system. To improve the stability of modern power systems with CPLs, research efforts have been focused on impedance-based and small-gain stability criterion, the design of advanced controllers, and passive or active damping solutions. Some disadvantages for most of the existing solutions include unnecessary energy losses in their passive elements, requirements of beforehand knowledge of the system characteristics, and inadaptability to the change in system operating conditions. This thesis presents new methods for stabilizing power systems with CPLs using tunable active damping based on an auxiliary converter circuit. Therein, the load bus voltage is monitored and an active damper is used to stabilize the system once an instability is detected. The methodologies are first developed in DC power systems and later extended for three-phase AC power systems as well. The proposed methodologies are less conservative than traditional methods and its damping characteristics are established “on-the-fly” in real-time to achieve effective stabilization under various CPLs and different operating conditions that may be unknown a priori. The proposed methodologies are verified under three different power systems: a simplified version of an aircraft power system with two sources, a 48/24 VDC telecom system consisting commercially available converters, and a three-phase AC power system. It has been shown that the proposed methodologies can detect instability and damp the unstable oscillations in all three systems when the CPL power level becomes high.
Improving Compound Activity Classification via Deep Transfer and Representation Learning
Creators: name: Dey, Vishal
name: Machiraju, Raghu
name: Ning, Xia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Biomolecules (q-bio.BM)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: Recent advances in molecular machine learning, especially deep neural networks such as Graph Neural Networks (GNNs) for predicting structure activity relationships (SAR) have shown tremendous potential in computer-aided drug discovery. However, the applicability of such deep neural networks are limited by the requirement of large amounts of training data. In order to cope with limited training data for a target task, transfer learning for SAR modeling has been recently adopted to leverage information from data of related tasks. In this work, in contrast to the popular parameter-based transfer learning such as pretraining, we develop novel deep transfer learning methods TAc and TAc-fc to leverage source domain data and transfer useful information to the target domain. TAc learns to generate effective molecular features that can generalize well from one domain to another, and increase the classification performance in the target domain. Additionally, TAc-fc extends TAc by incorporating novel components to selectively learn feature-wise and compound-wise transferability. We used the bioassay screening data from PubChem, and identified 120 pairs of bioassays such that the active compounds in each pair are more similar to each other compared to its inactive compounds. Our experiments clearly demonstrate that TAc achieves significant improvement over all baselines across a large number of target tasks. Furthermore, although TAc-fc achieves slightly worse ROC-AUC on average compared to TAc, TAc-fc still achieves the best performance on more tasks in terms of PR-AUC and F1 compared to other methods. In summary, TAc-fc is also found to be a strong model with competitive or even better performance than TAc on a notable number of target tasks.
description: This manuscript has been accepted at ACS Omega
Influence of system mass on the emission of intermediate mass fragments
Creators: name: Kaur, Sukhjit
name: Goyal, Supriya
name: Puri, Rajeev K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: In the present study, we have simulated the central reactions of nearly symmetric and asymmetric systems over the entire periodic table for different values of energies using QMD model as event generator. These reactions are simulated for the different equations of state, nn cross-sections and different widths of Gaussians. We have observed that the multiplicity of IMFs shows a rise and fall with increase in beam energy in the center-of-mass frame as already predicted experimentally/theoretically. We have also studied the mass dependence of peak Ec.m. and peak . It has been observed that peak Ec.m. increases linearly with system mass whereas a power law dependence has been observed for peak IMFs with tau \approx 1.0. Our calculations using hard EoS along with cugnon cross-section and MSTB method are in good agreement with experimental data. Similar power law dependence is also observed for various fragments.
A Study of Nuclear Effects using Forward-Rapidity Hadron Production and Di-Hadron Angular Correlations in √sNN = 200 GeV d+Au and p+p Collisions with the PHENIX Detector at RHIC
Creators: name: Meredith, Beau
Publisher: name: Zenodo
Year: 2011
Subjects: forward-rapidity
azimuthal
correlations
mid-rapidity
modification
cgc

description: This thesis describes the first experimental measurements of these forward dihadron correlations in PHENIX. We present results based on the high integrated-luminosity data sample of proton-proton and d+Au collisions at √sNN= 200 GeV taken at RHIC in 2008.
Algorithm for adaptive insertion of cohesive elements within computational domain for anticipating crack path
Creators: name: Uremovic, Domagoj
name: Buljak, Vladimir
Publisher: name: Zenodo
Year: 2025

description: This paper presents an algorithm for the automatic insertion of cohesive elements within the computational domain. The developed algorithm addresses two key problems relevant to crack simulations: the initiation point of the crack and the direction of its propagation. The results presented here focus on a wedge splitting test, which is commonly used to evaluate fracture properties of quasi-brittle materials. By incorporating cohesive elements, the robustness of the simulations is ensured, as they are straightforward to implement within finite element analysis. Additionally, the algorithm’s iterative nature allows for continuous re-meshing of the domain, effectively minimizing the intrinsic mesh dependency.
Tradition, Innovation and Emotion: BMW Motorrad R Boxer Series
Creators: name: Özgen, Sinan
name: Vatan, Ceyda
Publisher: name: Zenodo
Year: 2019
Subjects: Experience
Memory
History
Emotion

description: Within this paper the story of BMW R boxer series’ 80 years history will be presented. It will contain the design evolution, product life cycle, technological innovation compared to product-user emotional interaction.

The history of BMW Motorrad is a success story which began with the development of the flat twin "Boxer" engine some 100 years ago and has progressed through to today's state-of-the-art technological innovations. The transformation of R series from engineering object to design subject can be clearly seen in its process. The melding of industrial and Teutonic art, the R's design will likely remain timeless (classical) in motorcycle design world. The product’s classical design will be discussed from the point of view of product and user emotional experience.

The boxer's blend of curves and angles is classic "International style". This genre of design was developed at The Bauhaus, German school of industrial design. The International style was based on the fundamental principle that "art should meet the needs of society” and that no distinction should be made between industrial design and practical crafts. The user always remember the classical design of R boxer during the years even the design changes. This mentality of engineer experienced design is produced different kind of products compared to the other rivals.

For the user, the R Boxer will never be "out of style" since it was never designed to comply with contemporary standards of style. Instead, it uses timeless elements that can always be counted upon to inspire its owner to suit up and ride.
The laminar generalized Stokes layer and turbulent drag reduction
Creators: name: Quadrio, Maurizio
name: Ricco, Pierre
Publisher: name: arXiv
Year: 2010
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This paper considers plane channel flow modified by waves of spanwise velocity applied at the wall and travelling along the streamwise direction. Laminar and turbulent regimes for the streamwise flow are both studied. When the streamwise flow is laminar, it is unaffected by the spanwise flow induced by the waves. This flow is a thin, unsteady and streamwise-modulated boundary layer that can be expressed in terms of the Airy function of the first kind. We name it the generalized Stokes layer because it reduces to the classical oscillating Stokes layer in the limit of infinite wave speed. When the streamwise flow is turbulent, the laminar generalized Stokes layer solution describes well the space-averaged turbulent spanwise flow, provided that the phase speed of the waves is sufficiently different from the turbulent convection velocity, and that the time scale of the forcing is smaller than the life time of the near-wall turbulent structures. Under these conditions, the drag reduction is found to scale with the Stokes layer thickness, which renders the laminar solution instrumental for the analysis of the turbulent flow. A classification of the turbulent flow regimes induced by the waves is presented by comparing parameters related to the forcing conditions with the space and time scales of the turbulent flow.
description: Accepted for publication on J. Fluid Mech
Casimir momentum of magneto-chiral matter
Creators: name: Babington, James
name: van Tiggelen, Bart A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider a scattering formulation of radiative momentum transfer to a Magneto-Chiral system that is subjected to a constant background magnetic field. The system takes the form of a collection magnetic dipoles that exhibit the Faraday effect. It is shown that the first non-trivial contribution of the momentum transfer to the object from the radiation field occurs at fourth order in the Born series.
description: 4 pages, 3 figures
Proactive and Reactive Styles of Palestinian Presidents Leadership in Times of Crisis
Creators: name: Arandas, Mohammed Fadel
name: Idid, Syed Arabi
name: Loh, Yoke Ling
name: Loh, Yu Chiang
Publisher: name: figshare
Year: 2022
Subjects: subject: 200101 Communication Studies
subject: FOS: Media and communications

description: Crises are unavoidable which makes response an imperative matter. Thus, the proactive style becomes an indispensable part of the readiness and preparedness in any potential crisis and can help prevent it. Besides, the reactive style is still important to deal effectively with a crisis especially regarding its recovery. Proactive and reactive styles were needed by Palestinian Presidents due to the occurrence of various crises faced by them. This study examines both proactive and reactive styles used by the Palestinian Presidents leadership during crisis. Besides, it examines how the Palestinian Presidents used these styles to deal with different crises at different times. This study used content analysis on the news stories from the New Straits Times. A total of 313 stories from1996 to 2016 pertaining to proactive and reactive styles used by Palestinian Presidents were found. The stories that included reactive style figured 67.7%, while the stories that includedproactive style totaled 32.3%. For President Arafat, a total of 63% of the stories included reactive style compared to 37% of the stories that included proactive style. For President Abbas, a total of 78.4% of the stories contained reactive style compared to 21.6% that contained proactive style. Proactive style has been used only in political crises, while reactive style has been used in all crises. Providing various scenarios in dealing with crises allows other organizations and individuals to be initiative in dealing with any similar future crises. This study serves as a guideline for choosing proper prospective measures and responses to crises.
Training Data Reduction for Performance Models of Data Analytics Jobs in the Cloud
Creators: name: Will, Jonathan
name: Arslan, Onur
name: Bader, Jonathan
name: Scheinert, Dominik
name: Thamsen, Lauritz
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences
subject: C.2.4; I.2.8; I.2.6

description: Distributed dataflow systems like Apache Flink and Apache Spark simplify processing large amounts of data on clusters in a data-parallel manner. However, choosing suitable cluster resources for distributed dataflow jobs in both type and number is difficult, especially for users who do not have access to previous performance metrics. One approach to overcoming this issue is to have users share runtime metrics to train context-aware performance models that help find a suitable configuration for the job at hand. A problem when sharing runtime data instead of trained models or model parameters is that the data size can grow substantially over time. This paper examines several clustering techniques to minimize training data size while keeping the associated performance models accurate. Our results indicate that efficiency gains in data transfer, storage, and model training can be achieved through training data reduction. In the evaluation of our solution on a dataset of runtime data from 930 unique distributed dataflow jobs, we observed that, on average, a 75% data reduction only increases prediction errors by one percentage point.
description: 6 pages, 5 figures, Accepted for the BPOD Workshop at IEEE Big Data 2021
Collective flow and balance energy in asymmetric heavy-ion collisions
Creators: name: Goyal, Supriya
name: Gautam, S.
name: Sood, Aman D.
name: Puri, Rajeev K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Collective flow and balance energy in asymmetric heavy-ion collisions
High-resolution transmission spectroscopy of the super-Earth 55 Cnc e
Creators: name: Keles, Engin
Publisher: name: Zenodo
Year: 2021

description: The comparison of exoplanets with well-studied Solar System planets can provide answers to the fundamental questions regarding their evolutionary path. The study of exoplanet atmospheres via high-resolution transmission spectroscopy has shown great success, especially for Jupiter-type planets. In the last years, this study also continued with promising investigations towards the atmospheric characterization of terrestrial exoplanets. One possible target for such investigation is the super Earth-sized exoplanet 55 Cnc e, which is one of the most studied terrestrial exoplanets to date. Currently, there are two possible atmospheric scenarios for 55 Cnc e: Either there is a heavy-weighted envelope with a significant amount of water or there is no gaseous envelope at all i.e. a rocky surface similar to Mercury, of our Solar System. Here, we present high-resolution (R = 120 000) transit observation of this planet, acquired with the PEPSI instrument at the Large Binocular Telescope, aiming to search for absorption signatures from various species in the puzzling atmosphere of 55 CNC e.
Highly Ionized Sodium X-ray Line Emission from the Solar Corona and the Abundance of Sodium
Creators: name: Phillips, K. J. H.
name: Aggarwal, K. M.
name: Landi, E.
name: Keenan, F. P.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: {The \ion{Na}{x} X-ray lines between 10.9 and 11.2~Å have attracted little attention but are of interest since they enable an estimate of the coronal abundance of Na to be made. This is of great interest in the continuing debate on the nature of the FIP (first ionization potential) effect. } {Observations of the \ion{Na}{x} lines with the Solar Maximum Mission Flat Crystal Spectrometer and a rocket-borne X-ray spectrometer are used to measure the Na/Ne abundance ratio, i.e. the ratio of an element with very low FIP to one with high FIP.} {New atomic data are used to generate synthetic spectra which are compared with the observations, with temperature and the Na/Ne abundance ratio as free parameters.} {Temperature estimates from the observations indicate that the line emission is principally from non-flaring active regions, and that the Na/Ne abundance ratio is $0.07 \pm 50$\%.} {The Na/Ne abundance ratio is close to a coronal value for which the abundances of low-FIP elements (FIP $< 10$~eV) are enhanced by a factor of 3 to 4 over those found in the photosphere. For low-temperature ($T_e \leqslant 1.5$~MK) spectra, the presence of \ion{Fe}{xvii} lines requires that either a higher-temperature component is present or a revision of ionization or recombination rates is needed. }
description: Latex file and 5 figures in color. Astronomy and Astrophysics (to be published)
Sport slavery : The exploitation of teenagers by ‘mock-amateur’ for-profit sport cartels : a study of the National Collegiate Athletic Association (NCAA) & the Canadian Hockey League (CHL) : can law obtain compensation for these monetized young stars?
Creators: name: MacDonald, Susan D.
Publisher: name: University of British Columbia
Year: 2025

description: This thesis is a scholarly contribution to law, sport, economics, politics, and children’s human rights. It represents thousands of teenagers tricked into working for no compensation by ‘mock-amateur’ billion-dollar sport cartels. The thesis examines six North American sport cartels, focusing on the Canadian Hockey League [CHL] and National Collegiate Athletic Association [NCAA]. Sport cartels easily exploit teenage athletes because of unrestrained use of the word ‘amateur’. The power behind ‘mock-amateur’ cartels is that they are absolute monopolies with monopsony control, plus hold strategic lobbyist and hegemonic influence — powers that create lawmaking. It is hypothesized that normal civil legal actions and statute law are unable to achieve the teenagers’ compensation rights. The thesis answer is the use of public law and the public inquiry. O’Bannon and Northwestern 2016 litigation results affirmed that mock-amateur cartels are untouchable via litigation strategies, with Canadian 2018 CHL class action trilogy of Berg and Walter likely to produce the same result. I further conclude that the rule of law, Canadian Constitution, separation of powers, federalism, and common law interfere in obtaining fair results. The thesis aims to overturn the cartel arrangement of no-pay, no-Name-Image-Likeness [NIL] rights, and the thesis also aims to expose the cartel’s extortion of the teenagers’ education trust funds. Investigatory methods were research of relevant texts and broadcasts of scholarly and journalistic experts in economics, law, and sport and commerce, with examination of extensive statutory provisions and the common-law of the US and Canada in areas of anti-competition, labour rights/relations, contract law, constitutional law, class action procedures, and public law. Three field studies were completed for this thesis, in California (O’Bannon), Michigan (Northwestern), and Saskatchewan/Alberta to research CHL revenue. The thesis hypothesis was correct: the rule of law requires that the separation of powers’ three branches must all act to achieve justice. Judiciary and politicians failing, the executive branch must act. This thesis recommends a transnational Canada/US public inquiry addressing working children’s unique existence and helplessness, also addressing due process, accountability and transparency from dangerous ‘mock-amateur’ sport cartels.
Optical sensing of magnons via the magnetoelastic displacement
Creators: name: Fan, Zhi-Yuan
name: Shen, Rui-Chang
name: Wang, Yi-Pu
name: Li, Jie
name: You, J. Q.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We show how to measure a steady-state magnon population in a magnetostatic mode of a ferromagnet or ferrimagnet, such as yttrium iron garnet. We adopt an optomechanical approach and utilize the magnetoelasticity of the ferromagnet. The magnetostrictive force dispersively couples magnons to the deformation displacement of the ferromagnet, which is proportional to the magnon population. By further coupling the mechanical displacement to an optical cavity that is resonantly driven by a weak laser, the magnetostrictively induced displacement can be sensed by measuring the phase quadrature of the optical field. The phase shows an excellent linear dependence on the magnon population for a not very large population, and can thus be used as a `magnometer' to measure the magnon population. We further study the effect of thermal noises, and find a high signal-to-noise ratio even at room temperature. At cryogenic temperatures, the resolution of magnon excitation numbers is essentially limited by the vacuum fluctuations of the phase, which can be significantly improved by using a squeezed light.
DEP Bulletin: Volume 41 Issue 5
Creators: name: No Name Supplied
Publisher: name: No Publisher Supplied
Year: 2017

description: The DEP bulletin is a semi-monthly publication of the New Jersey Department of Environmental Protection. It contains a list of construction permit applications recently filed or acted upon by the Department along with a calendar of events of interest, a schedule of public hearings, and Environmental Impact Statements acted upon during the period.
Large Magnetic-Field-Induced Strain at the Spin-Reorientation Transition in the A-Site Ordered Spinel Oxide LiFeCr4O8
Creators: name: Okamoto, Yoshihiko
name: Kanematsu, Tomoya
name: Kubota, Yuki
name: Yajima, Takeshi
name: Takenaka, Koshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Sintered samples of a spinel oxide LiFeCr4O8, where Cr3+ and Fe3+ ions have localized moments, were found to show a large magnetic-field-induced volume increase approaching 500 ppm by applying a magnetic field of 9 T. This large volume increase appeared only at around 30 K. At 30 K, a spin-reorientation transition from ferrimagnetic to conical order occurs, giving rise to this large volume increase. The coexistence of ferrimagnetic and conical phases at this transition was found to be important, suggesting that such a large magnetic-field-induced volume change can be realized at various magnetic transitions in localized magnets with strong spin-lattice coupling.
description: 6 pages, 4 figures, J. Phys. Soc. Jpn., accepted
Heterogenous Human Dynamics in Intra and Inter-day Time Scale
Creators: name: Wang, Peng
name: Lei, Ting
name: Yeung, Chi Ho
name: Wang, Bing-hong
Publisher: name: arXiv
Year: 2010
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this paper, we study two large data sets containing the information of two different human behaviors: blog-posting and wiki-revising. In both cases, the interevent time distributions decay as power-laws at both individual and population level. As different from previous studies, we put emphasis on time scales and obtain heterogeneous decay exponents in intra- and inter-day range for the same dataset. Moreover, we observe opposite trend of exponents in relation to individual $Activity$. Further investigations show that the presence of intra-day activities mask the correlation between consecutive inter-day activities and lead to an underestimate of $Memory$, which explain the contradicting results in recent empirical studies. Removal of data in intra-day range reveals the high values of $Memory$ and lead us to convergent results between wiki-revising and blog-posting.
Measuring abundances from high-resolution cross correlation spectroscopy (HRCCS)
Creators: name: Brogi, Matteo
Publisher: name: Zenodo
Year: 2021

description: The last decade has seen the rise of spectroscopy at very high resolution (R > 25,000) obtained with telescopes on the ground to measure the chemical inventory of exoplanet atmospheres. This technique couples the ability to resolve the dense forest of molecular lines with the sensitivity to the changing planet's orbital motion, and it extracts information from spectra via cross correlation with models. While HRCCS has shown enormous potential to recognise molecular species, exploring family of models and retrieving information about abundances and temperature has proven more challenging, and working solutions have only emerged in the last two years. In this talk I will explain how high-resolution observations differ from low-resolution, the major results of the last decade in terms of infrared spectroscopy (i.e. looking for molecules), and the recent developments to measure abundances from both emission and transmission spectroscopy. Lastly, I will highlight the complementarity between space and ground-based observatories, which we are just starting to exploit and will be fully realised when coupling JWST to the ELT.
Influence of the Range of Interaction on the Stability of the Nucleus propagating with Momentum Dependent Interactions
Creators: name: Goyal, Supriya
name: Puri, Rajeev K.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Influence of the Range of Interaction on the Stability of the Nucleus propagating with Momentum Dependent Interactions.
Nitrogen cycling and microbial cooperation in the terrestrial subsurface
Creators: name: Mosley, Olivia E.
name: Gios, Emilie
name: Close, Murray E.
name: Daughney, Chris
name: Handley, Kim M.
Publisher: name: Institute of Environmental Science and Research
Year: 2023
Subjects: Environmental assessment and monitoring
Natural resource management

description: The nitrogen cycle plays a major role in aquatic nitrogen transformations, including in the terrestrial subsurface. However, the variety of transformations remains understudied. To determine how nitrogen cycling microorganisms respond to different aquifer chemistries, we sampled groundwater with varying nutrient and oxygen contents. Genes and transcripts involved in major nitrogen-cycling pathways were quantified from 55 and 26 sites, respectively, and metagenomes and metatranscriptomes were analyzed from a subset of oxic and dysoxic sites (0.3-1.1 mg/L bulk dissolved oxygen). Nitrogen-cycling mechanisms (e.g. ammonia oxidation, denitrification, dissimilatory nitrate reduction to ammonium) were prevalent and highly redundant, regardless of site?specific physicochemistry or nitrate availability, and present in 40% of reconstructed genomes, suggesting that nitrogen cycling is a core function of aquifer communities. Transcriptional activity for nitrification, denitrification, nitrite-dependent anaerobic methane oxidation and anaerobic ammonia oxidation (anammox) occurred simultaneously in oxic and dysoxic groundwater, indicating the availability of oxic-anoxic interfaces. Concurrent activity by these microorganisms indicates potential synergisms through metabolite exchange across these interfaces (e.g. nitrite and oxygen). Fragmented denitrification pathway encoding and transcription was widespread among groundwater bacteria, although a considerable proportion of associated transcriptional activity was driven by complete denitrifiers, especially under dysoxic conditions. Despite large differences in transcription, the capacity for the final steps of denitrification was largely invariant to aquifer conditions, and most genes and transcripts encoding N2O reductases were the atypical Sec-dependant type, suggesting energy-efficiency prioritization. Results provide insights into the capacity for cooperative relationships in groundwater communities, and the richness and complexity of metabolic mechanisms leading to the loss of fixed nitrogen.
Harvesting of Oil Palm Bunches Using Aluminium Pole
Creators: name: Sanganamoni Shivashankar, M V Prasad, K Suresh, N V Ganesh and K Manikanta
Publisher: name: The Science world a Monthly e magazine
Year: 2023

description: Harvesting of oil palm bunches is one of the most challenging, laborious and expensive operations in oil palm cultivation. There has been practicing few harvesting methods for oil palm bunches using different tools and machinery. Most commonly using methods are rope climbing and pole harvesting. Pole harvesting method is smooth and easy in operation and reduces the drudgery involved in harvesting of oil palm compared to other traditional harvesting methods. However, oil palm harvesting still defies the best attempts at mechanization.
An introduction to gravitational waves through electrodynamics: a quadrupole comparison
Creators: name: Dorsch, Glauber C.
name: Porto, Lucas E. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a pedagogical introduction to some key computations in gravitational waves via a side-by-side comparison with the quadrupole contribution of electromagnetic radiation. Subtleties involving gauge choices and projections over transverse modes in the tensorial theory are made clearer by direct analogy with the vectorial counterpart. The power emitted by the quadrupole moment in both theories is computed, and the similarities as well as the origins of eventual discrepancies are discussed. Finally, we analyze the stability of bound systems under radiation emission, and discuss how the strength of the interactions can be established this way. We use the results to impose an anthropic bound on Newton's constant of order $G\lesssim 3\times 10^4\, G_\text{obs}$, which is on par with similar constraints from stellar formation.
description: 26 pages, 4 figures
Preliminary ESPPU Report N.2
Creators: name: Losito, Roberto
name: Schulte, Daniel
name: Lucchesi, Donatella
name: Chance, Antoine
name: Rossi, Lucio
name: Milas, Natalia
name: Bottura, Luca
name: Giove, Dario Augusto
name: Chris, Rogers
name: Metral, Elias
name: Bahng, E.J.
Publisher: name: Zenodo
Year: 2025

description: MuCol D1.3 - WP1 - Preliminary ESPPU Report N.2