cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Effect of Water Treadmill Exercise on Children with Attention Deficit Hyperactivity Disorder
Creators: name: Sabzi, Amir Hamze
name: Dana, Amir
name: Salehian, Mir Hamid
name: Yekta, Haniyeh Shaygan
Publisher: name: figshare
Year: 2021
Subjects: subject: 170114 Sport and Exercise Psychology
subject: FOS: Psychology

description: Attention deficit hyperactivity disorder (ADHD) is one of the prevalent disorders in child psychiatry with the potential of damage to mental talent evolution process and socio-emotional skills. This study aimed to determine the effect of Water treadmill exercise on children with Attention deficit hyperactivity disorder (ADHD).
Materials and Methods: This was an experimental study with pretest, posttest design which was done in Gorgan. Participants were 46 children (mean age= 9.45±0.5, male= gender) who were identified and selected based on diagnostic criteria in two stages and were randomly divided into experimental and control groups (n= 23). The experimental group performed running on a Water treadmill for eight weeks with three sessions each week (24 sessions in total) and each session for 30 minutes. The exercise intensity was for 10 minutes 40-45% and 20 minutes 55-65% of the maximum heart rate reserve. All sessions begin with a brief warm-up, including light aerobic activity and dynamic, static stretching, and end with a cool-down. Disorder Levels were measured using the Conners’ Parent Rating Scale-Revised (CPRS-R), and diagnostic interviews. Data were analyzed using SPSS software version 22.
Results: The results showed that after controlling the pretest levels, behavior problems, social problems, anxiety-shyness, psychosomatic, and the overall score of attention deficit hyperactivity disorder in the experimental group were significantly lower the posttest than the control group (p< 0.05)
Broad HI Absorbers as Metallicity-Independent Tracers of the Warm-Hot Intergalactic Medium
Creators: name: Danforth, Charles W.
name: Stocke, John T.
name: Shull, J. Michael
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Thermally broadened Ly alpha absorbers (BLAs) offer an alternative method to highly-ionized metal lines for tracing the WHIM. We compile a catalog of reliable BLA candidates along seven AGN sight lines from a larger set of Lya absorbers observed by HST/STIS. We compare our measurements based on independent reduction and analysis of the data to those published by other research groups. Purported BLAs are grouped into probable (15), possible (48) and non-BLA (56) categories. We infer a line frequency (dN/dz)_BLA=18+-11, comparable to observed OVI absorbers. There is significant overlap between BLA and OVI absorbers (20-40%) and we find that OVI detections in BLAs are found closer to galaxies than OVI non-detections. Based on 164 measured COG HI line measurements, we statistically correct the observed line widths via a Monte- Carlo simulation. Gas temperature and neutral fraction f(HI) are inferred from these statistically-corrected line widths and lead to a distribution of total hydrogen columns. We find Omega_BLA=(6.3+1.1-0.8)x10^-3. There are a number of critical systematic assumptions implicit in this calculation, and we discuss how each affects our results and those of previously published work. Taking our value, current OVI and BLA surveys can account for ~20% of the baryons in the local universe. Finally, we present new, high-S/N observations of several of the BLA candidate lines from Early Release Observations made by the Cosmic Origins Spectrograph on HST.
description: 23 pages, 10 figures, ApJ submitted
Neutrino Mixing in Unified Extended Seesaw Model
Creators: name: Varzielas, Ivo de Medeiros
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The seesaw mechanism can play a key role in the generation of the leptonic mixing in unified models. We consider an unified model with a family symmetry and extended seesaw, and obtain viable fermion masses and mixing (leptonic mixing is close to tri-bi-maximal).
description: Proceedings submission for SUSY09, 4 pages, 1 figure
The Effects of a Period of Selected Physical Activity on Improving Manipulative and Locomotors Skills of Children with Neuropsychological Learning Disabilities
Creators: name: Dana, Amir
name: Christodoulides, Efstathios
Publisher: name: figshare
Year: 2021
Subjects: subject: 170114 Sport and Exercise Psychology
subject: FOS: Psychology

description: the aim of this research was to investigate the effects of a period of selected physical activity on improving the fundamental skills of manipulation and locomotion in children with neuropsychological learning disabilities.
Methods:
The present research was semi-experimental. A total of 30 students with neuropsychological learning disorders with an average age of 7.76 participated in this research selected by available sampling. The instrument utilized in this research was the test of Gross Motor Skills. After performing the pretest of locomotor and manipulative skills, the participants were classified homogeneously into experimental and control groups. The experimental group, in addition to taking part in their routine classes at school, also participated in twelve 45-min sessions (three sessions per week) in the Spark program. The control group took part in only their own routine classes. By the end of the 12th session, a posttest was performed. The data were analyzed through covariance analysis in SPSS 22. The significance level was considered as P<0.05.
Results:
the results showed that in the variables of locomotion (running (P<0.001), hopping (P=0.001) and long jump (P=0.001), as well as manipulative variables (kicking (P<0.001), overhead throwing (P<0.001) and catching (P=0.0001) there was a significant difference between the experimental and control groups. Based on the main differences, the experimental group displayed better performance compared to the control group.
Conclusion:
overall, it can be stated that a 12-session course based on a selected physical activity can result in improved locomotor and manipulative …
Carolina von Deschwanden (1794-1870) an Joseph Wolfgang von Deschwanden (1819-1866)
Creators: name: Deschwanden, Carolina von
name: Deschwanden von, verheiratete Zürcher, Anna
Publisher: name: [s.n.]
Year: 1846

description: Brief aus Stans.
Briefzusatz von Anna von Deschwanden, datiert an Peter und Paul (29.6.)
On the Uniqueness of Participation Factors in Nonlinear Dynamical Systems
Creators: name: Xia, Tianwei
name: Sun, Kai
Publisher: name: arXiv
Year: 2024
Subjects: subject: Dynamical Systems (math.DS)
subject: Systems and Control (eess.SY)
subject: FOS: Mathematics
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In the modal analysis and control of nonlinear dynamical systems, the participation factors of state variables with respect to a critical or selected mode serve as a pivotal tool for simplifying stability studies by focusing on a subset of highly influential state variables. For linear systems, the participation factors of state variables regarding a mode are uniquely determined by the mode's composition and shape, defined by the system's left and right eigenvectors, respectively. However, the uniqueness of other types of participation factors necessitates further investigation. This paper establishes a sufficient condition for the uniqueness of nonlinear participation factors and five other variants of participation factors, accounting for uncertain scaling factors in a mode's shape and composition. These scaling factors arise from variations in the selection of physical units or the value ranges of state variables when analyzing and controlling real-world dynamical systems. Understanding the sufficient condition of the uniqueness is therefore crucial for the correct application of participation factors in practical scenarios. Additionally, the paper explores the relationship between perturbation magnitudes in state variables and the selection of optimal scaling factors.
description: Accepted
Interference contrast in multi-source few photon optics
Creators: name: Laskowski, Wieslaw
name: Wiesniak, Marcin
name: Zukowski, Marek
name: Bourennane, Mohamed
name: Weinfurter, Harald
Publisher: name: arXiv
Year: 2009
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Many recent experiments employ several parametric down conversion (PDC) sources to get multiphoton interference. Such interference has applications in quantum information. We study here how effects due to photon statistics, misalignment, and partial distinguishability of the PDC pairs originating from different sources may lower the interference contrast in the multiphoton experiments.
description: 23 pages, 9 figures, journal version
Phenomenology of One-Dimensional Quantum Liquids Beyond the Low-Energy Limit
Creators: name: Imambekov, Adilet
name: Glazman, Leonid I.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We consider zero temperature behavior of dynamic response functions of 1D systems near edges of support in momentum-energy plane $(k, ω).$ The description of the singularities of dynamic response functions near an edge $ε(k)$ is given by the effective Hamiltonian of a mobile impurity moving in a Luttinger liquid. For Galilean-invariant systems, we relate the parameters of such an effective Hamiltonian to the properties of the function $ε(k).$ This allows us to express the exponents which characterize singular response functions of spinless bosonic or fermionic liquids in terms of $ε(k)$ and Luttinger liquid parameters for any $k.$ For an antiferromagnetic Heisenberg spin-1/2 chain in a zero magnetic field, SU(2) invariance fixes the exponents from purely phenomenological considerations.
description: final published version
Environmental Effects in the Evolution of Galactic Bulges
Creators: name: MacArthur, Lauren A.
name: Ellis, Richard S.
name: Treu, Tommaso
name: Moran, Sean
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate possible environmental trends in the evolution of galactic bulges over the redshift range 0=0.4 and =0.54 using surface photometry based on HST imaging and velocity dispersions based on Keck spectroscopy. As a reference point for our study we include data for pure ellipticals, which we model as single-component Sersic profiles; whereas for multi-component galaxies we undertake decompositions using Sersic and exponential models for the bulge and disk respectively. Although the FP for both distant cluster and field samples are offset from the local relation, consistent with evolutionary trends found in earlier studies, we detect significant differences in the zero point of ~=0.2 dex between the field and cluster samples at a given redshift. For both clusters, the environmentally-dependent offset is in the sense expected for an accelerated evolution of bulges in dense environments. By matching the mass range of our samples, we confirm that this difference does not arise as a result of the mass-dependent downsizing effects seen in larger field samples. Our result is also consistent with the hypothesis that - at fixed mass and environment - the star formation histories of galactic bulges and pure spheroids are indistinguishable, and difficult to reconcile with the picture whereby the majority of large bulges form primarily via secular processes within spiral galaxies.
description: 5 pages, 3 figures, accepted for publication in ApJ Letters
"Rewiring" Filterbanks for Local Fourier Analysis: Theory and Practice
Creators: name: Hirakawa, Keigo
name: Wolfe, Patrick J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This article describes a series of new results outlining equivalences between certain "rewirings" of filterbank system block diagrams, and the corresponding actions of convolution, modulation, and downsampling operators. This gives rise to a general framework of reverse-order and convolution subband structures in filterbank transforms, which we show to be well suited to the analysis of filterbank coefficients arising from subsampled or multiplexed signals. These results thus provide a means to understand time-localized aliasing and modulation properties of such signals and their subband representations--notions that are notably absent from the global viewpoint afforded by Fourier analysis. The utility of filterbank rewirings is demonstrated by the closed-form analysis of signals subject to degradations such as missing data, spatially or temporally multiplexed data acquisition, or signal-dependent noise, such as are often encountered in practical signal processing applications.
Theory of inter-edge superexchange in zigzag edge magnetism
Creators: name: Jung, J.
name: Pereg-Barnea, T.
name: MacDonald, A. H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A graphene nanoribbon with zigzag edges has a gapped magnetic ground state with an antiferromagnetic inter-edge superexchange interaction. We present a theory based on asymptotic properties of the Dirac-model ribbon wavefunction which predicts $W^{-2}$ and $W^{-1}$ ribbon-width dependencies for the superexchange interaction strength and the charge gap respectively. We find that, unlike the case of conventional atomic scale superexchange, opposite spin-orientations on opposite edges of the ribbon are favored by both kinetic and interaction energies.
description: 4 pages 8 figures
A Spin model for global flat-foldability of random origami
Creators: name: Nakajima, Chihiro
Publisher: name: arXiv
Year: 2024
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We map the problem of determining flat-foldability of the origami diagram onto the ground-state search problem of spin glass model on random graphs. If the origami diagram is locally flat-foldable around each vertex, a pre-folded diagram, showing the planar-positional relationship of the facet, can be obtained. For remaining combinatorial problem on layer ordering of facets can be described as a spin model. A spin variable is assigned for the layer-ordering of each pair of facets which have an overlap in the pre-folded diagram. The interactions to prohibit the intrusion of each facet into the other component of the same origami diagram are introduced among two or four spins. The flat-foldability of the diagram is closely related to the (non-)existence of frustrated loops on the spin model with the interactions on the random (hyper)graph.
Developing and strengthening student-teacher relationships in online learning contexts : helping and hindering factors
Creators: name: Gist, Alexander
Publisher: name: University of British Columbia
Year: 2024

description: A solid research base has linked student-teacher relationships to student motivation, engagement and academic performance for students learning in person. However, this research may not be generalizable to students learning online because the learning context is thought to impact the relationships students and teachers can develop. Therefore, the factors that help or hinder the development of positive student-teacher relationships in online and in-person learning contexts may differ. Nascent research on student-teacher relationships in online learning has established that teachers can develop supportive relationships with students in online learning contexts and that these relationships are positively related to students’ learning, motivation, and engagement. However, there is limited research on how student-teacher relationships are effectively formed and fostered online. This study aimed to fill this research gap by exploring online secondary school teachers’ perceptions of the factors that helped or hindered them in forming, developing, and sustaining supportive relationships with their students. The Enhanced Critical Incident Technique (ECIT) was used to systematically gather, analyze and categorize interview data. Individual, in-depth, and semi-structured interviews were conducted with 17 secondary teachers from nine distinct online learning programs in British Columbia, Canada. A total of 301 Critical Incidents (CIs) were extracted from the interviews, including 179 helping CIs, 77 hindering CIs, and 45 wish list items. Using the ECIT categorization process, 12 thematic categories were created of factors that help, hinder, or would be desirable for student-teacher relationships in online learning: (1) Time challenges, (2) School-based supports, (3) Synchronicity of learning, (4) Starting the course off strong, (5) Commitment to supportive relationships and learning environments, (6) Curriculum and course design, (7) Student-specific barriers, (8) Technological barriers, (9) Parent involvement, (10) Regular and effective communication, (11) Feedback, and (12) Extracurriculars and events. Key findings in four broad areas, (1) Program Context, (2) Teacher Characteristics and Approaches, (3) Student and Family Characteristics, and (4) Student-Teacher Interactions, are discussed in relation to existing literature. Overall, this study provides a deeper understanding of the factors teachers perceive as helping, hindering, or desirable for supportive relationships with their students in asynchronous, self-paced, continuous entry and exit programs.
Effects of an Intervention in Online Physical Education Classes on Motivation, Intention, and Physical Activity of Adolescents during the COVID-19 Pandemic
Creators: name: Dana, Amir
name: Khajeaflaton, Sedigheh
name: Salehian, Mir Hamid
name: Sarvari, Sepideh
Publisher: name: figshare
Year: 2021
Subjects: subject: 170114 Sport and Exercise Psychology
subject: FOS: Psychology

description: An important issue for pediatric health is to understand how to enhance the level of physical activity of children and adolescents during the pandemic. The present study aimed to investigate the effects of a physical education- based online intervention on promoting motivation and physical activity of adolescents during the COVID-19 pandemic.
Methods:
The present study used an experimental design with pre-test and post-test conducted in Iran, 2020. The participants were 68 high school students who were randomly allocated into intervention and control groups. The participants of the intervention group were exposed to a three-month intervention based on Self-Determination theory within the online physical education classes while those in the control group followed their regular online physical education classes. Perceived autonomy support, motivation, intention, and physical activity behavior were measured using standard questionnaires. Independent t test and analysis of variance (ANOVA) were utilized to analyze the data.
Results:
The pre-test showed that the participants of both groups had similar perceived autonomy support, motivation, intention, and physical activity behavior at baseline. However, the participants in the intervention group reported higher perceived autonomy support (3.2 vs. 1.48, p <0.001), motivation (3.03 vs. 1.49, p <0.001), intention (2.75 vs. 1.51, p <0.001), and physical activity level (2.4 vs. 1.11, p <0.001) in the post-test in comparison to those in the control group.
Conclusions:
These results highlighted the importance of developing strategies in online physical education classes for improving motivation …
The anatomy of the NGC 5044 group -- II. Stellar populations and star-formation histories
Creators: name: Mendel, J. Trevor
name: Proctor, Robert N.
name: Rasmussen, Jesper
name: Brough, Sarah
name: Forbes, Duncan A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The distribution of galaxy properties in groups and clusters holds important information on galaxy evolution and growth of structure in the Universe. While clusters have received appreciable attention in this regard, the role of groups as fundamental to formation of the present day galaxy population has remained relatively unaddressed. Here we present stellar ages, metallicities and alpha-element abundances derived using Lick indices for 67 spectroscopically confirmed members of the NGC 5044 galaxy group with the aim of shedding light on galaxy evolution in the context of the group environment. We find that galaxies in the NGC 5044 group show evidence for a strong relationship between stellar mass and metallicity, consistent with their counterparts in both higher and lower mass groups and clusters. Galaxies show no clear trend of age or alpha-element abundance with mass, but these data form a tight sequence when fit simultaneously in age, metallicity and stellar mass. In the context of the group environment, our data support the tidal disruption of low-mass galaxies at small group-centric radii, as evident from an apparent lack of galaxies below ~10^9 M_sun within ~100 kpc of the brightest group galaxy. Using a joint analysis of absorption- and emission-line metallicities, we are able to show that the star-forming galaxy population in the NGC 5044 group appears to require gas removal to explain the ~1.5 dex offset between absorption- and emission-line metallicities observed in some cases. A comparison with other stellar population properties suggests that this gas removal is dominated by galaxy interactions with the hot intragroup medium.
description: 24 pages, 21 figures, accepted for publication in MNRAS
SGE: Structured Light System Based on Gray Code with an Event Camera
Creators: name: Lu, Xingyu
name: Sun, Lei
name: Gu, Diyang
name: Wang, Kaiwei
Publisher: name: arXiv
Year: 2024
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Fast and accurate depth sensing has long been a significant research challenge. Event camera, as a device that quickly responds to intensity changes, provides a new solution for structured light (SL) systems. In this paper, we introduce Gray code into event-based SL systems for the first time. Our setup includes an event camera and a Digital Light Processing (DLP) projector, enabling depth estimation through high-speed projection and decoding of Gray code patterns. By employing Gray code for point matching in event-based SL system, our method is immune to timestamp noise, realizing high-speed depth estimation without loss of accuracy and spatial resolution. The binary nature of events and Gray code minimizes data redundancy, enabling us to fully utilize sensor bandwidth at 100%. Experimental results show that our approach achieves accuracy comparable to state-of-the-art scanning methods while surpassing them in data acquisition speed (up to 41 times improvement) without sacrificing accuracy and spatial resolution. Our proposed approach offers a highly promising solution for ultra-fast, real-time, and high-precision dense depth estimation.
Origin of spatial variations of scattering polarization in the wings of the Ca {\sc i} 4227 Åline
Creators: name: Sampoorna, M.
name: Stenflo, J. O.
name: Nagendra, K. N.
name: Bianda, M.
name: Ramelli, R.
name: Anusha, L. S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Polarization that is produced by coherent scattering can be modified by magnetic fields via the Hanle effect. According to standard theory the Hanle effect should only be operating in the Doppler core of spectral lines but not in the wings. In contrast, our observations of the scattering polarization in the Ca {\sc i} 4227 Åline reveals the existence of spatial variations of the scattering polarization throughout the far line wings. This raises the question whether the observed spatial variations in wing polarization have a magnetic or non-magnetic origin. A magnetic origin may be possible if elastic collisions are able to cause sufficient frequency redistribution to make the Hanle effect effective in the wings without causing excessive collisional depolarization, as suggested by recent theories for partial frequency redistribution with coherent scattering in magnetic fields. To model the wing polarization we apply an extended version of the technique based on the "last scattering approximation". This model is highly successful in reproducing the observed Stokes $Q/I$ polarization (linear polarization parallel to the nearest solar limb), including the location of the wing polarization maxima and the minima around the Doppler core, but it fails to reproduce the observed spatial variations of the wing polarization in terms of magnetic field effects with frequency redistribution. This null result points in the direction of a non-magnetic origin in terms of local inhomogeneities (varying collisional depolarization, radiation-field anisotropies, and deviations from a plane-parallel atmospheric stratification).
description: Accepted in May 2009 for publication in The Astrophysical Journal
MPEC 2023-X264 : 2023 XZ11
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 XZ11

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Role of anion size, magnetic moment, and disorder on the properties of the organic conductor kappa-(BETS)_2Ga_{1-x}Fe_{x}Cl_{4-y}_Br_{y}
Creators: name: Steven, E.
name: Cui, H. B.
name: Kismarahardja, A.
name: Brooks, J. S.
name: Graf, D.
name: Kobayashi, H.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Shubnikov-de Haas and angular dependent magnetoresistance oscillations have been used to explore the role of anion size, magnetic moment, and disorder in the organic conductors kappa-(BETS)_2GaBr_{4} and kappa-(BETS)_2FeCl_{2}_Br_{2} in the isomorphic class kappa-(BETS)_2Ga_{1-x}Fe_{x}Cl_{4-y}_Br_{y}. The results, combined with previous work, show correlations between the anion composition (Ga_{1-x}Fe_{x}Cl_{4-y}_Br_{y}) and the superconducting transition temperature, effective mass, Fermi surface topology, and the mean free path.
description: 5 pages, 6 figures
Carolina von Deschwanden (1794-1870) an Joseph Wolfgang von Deschwanden (1819-1866)
Creators: name: Deschwanden, Carolina von
name: Deschwanden, Theodor von
Publisher: name: [s.n.]
Year: 1849

description: Brief aus Stans.
Briefzusatz von Victor Louis von Deschwanden und von Theodor von Deschwanden
Data management and curation practices in the long tail of research data: the case of survey research
Creators: name: Slavec, Ana
Publisher: name: Zenodo
Year: 2021

description: While large research collaborations can dedicate vast resources to the storage, analysis and sharing of data, the majority of scientists are working in small teams and have only limited funds to dedicate to data management, in particular this is true for doctoral students and other early career researchers. In social science research, the advent of free online (survey) data collection tools has enabled researchers to collect responses in an inexpensive way; however, a lot of the resulting data is not shared with other researchers and/or preserved for long-term use. One of the reasons is that this data is often of low quality and/or is not reusable due to incomplete metadata. In this presentation I overview data sharing challenges I encountered while working on my own long-tail social science projects and assisting other researchers with data collection, analysis and sharing in their projects. Moreover, I provide suggestions on how to improve the reusability of long tail survey research. In particular, I argue that the use of data management plans and other data management practices should be encouraged among social science researchers.
description: The project Using questionnaires to measure attitudes and behaviours of building users (Z5-1979) is financially supported by the Slovenian Research Agency.
Super-Hubble de Sitter Fluctuations and the Dynamical RG
Creators: name: Burgess, C. P.
name: Leblond, L.
name: Holman, R.
name: Shandera, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Perturbative corrections to correlation functions for interacting theories in de Sitter spacetime often grow secularly with time, due to the properties of fluctuations on super-Hubble scales. This growth can lead to a breakdown of perturbation theory at late times. We argue that Dynamical Renormalization Group (DRG) techniques provide a convenient framework for interpreting and resumming these secularly growing terms. In the case of a massless scalar field in de Sitter with quartic self-interaction, the resummed result is also less singular in the infrared, in precisely the manner expected if a dynamical mass is generated. We compare this improved infrared behavior with large-N expansions when applicable.
description: 33 pages, 4 figures
Techno-economic analysis of photovoltaic systems in Western Canada
Creators: name: Drew, Amandine
Publisher: name: University of British Columbia
Year: 2025

description: Solar energy has become a pivotal component of the energy landscape in recent years, demonstrating the highest growth rate of all renewable energy sources over the past decade. This thesis provides an overview of the current techno-economic status of photovoltaic (PV) energy in Interior British Columbia (B.C.), Canada, and in remote, off-grid communities in the Northwest Territories (N.W.T.). Two case studies are presented here for the implementation of a PV system in two contrasting environments in Western Canada. The first case study examines the implementation of a 152 kWp PV system on top of student residences in Kelowna, B.C. The second case study examines the feasibility of installing a PV system in the northern, remote, and First Nation’s community in what we now know as Fort McPherson, N.W.T. First, the energy consumption for the respective case studies is examined, providing insight into monthly and hourly consumption trends. The consumption trends show that as temperature extremes are accentuated due to climate change, electricity demand for cooling and heating will increase. Next, the PV systems are modelled and optimized in PVsyst, followed by a financial analysis examining the balance of system, the levelized cost of electricity (LCOE), and the impact of key variables on the payback period of the PV systems. In Kelowna, the results indicate that PV systems have a payback period under the lifetime of the PV system, and LCOE below ¢11 per kWh. A 5 kWp PV system in the Okanagan averages $3.24 per watt, while a larger PV system around 300 kWp averages $1.24 per watt. Contrastingly, the PV system size and cost of electricity in Fort McPherson plays a critical role in determining its financial viability. A 74 kWp PV system is financially viable for governmental customers and entities that pay non-subsidized electricity rates, or if 20% of the capital cost of the PV system is subsidized. This work is intended to serve as a blueprint for the feasibility of PV in Interior B.C. and in remote communities in Northern Canada, to lead to further uptake of solar energy in the province of B.C. and the N.W.T.
Pseudo-random number generators for Monte Carlo simulations on Graphics Processing Units
Creators: name: Demchik, Vadim
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Basic uniform pseudo-random number generators are implemented on ATI Graphics Processing Units (GPU). The performance results of the realized generators (multiplicative linear congruential (GGL), XOR-shift (XOR128), RANECU, RANMAR, RANLUX and Mersenne Twister (MT19937)) on CPU and GPU are discussed. The obtained speed-up factor is hundreds of times in comparison with CPU. RANLUX generator is found to be the most appropriate for using on GPU in Monte Carlo simulations. The brief review of the pseudo-random number generators used in modern software packages for Monte Carlo simulations in high-energy physics is present.
description: 31 pages, 9 figures, 3 tables
Might we eventually understand the origin of the dark matter velocity anisotropy?
Creators: name: Hansen, Steen H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The density profile of simulated dark matter structures is fairly well-established, and several explanations for its characteristics have been put forward. In contrast, the radial variation of the velocity anisotropy has still not been explained. We suggest a very simple origin, based on the shapes of the velocity distributions functions, which are shown to differ between the radial and tangential directions. This allows us to derive a radial variation of the anisotropy profile which is in good agreement with both simulations and observations. One of the consequences of this suggestion is that the velocity anisotropy is entirely determined once the density profile is known. We demonstrate how this explains the origin of the γ-βrelation, which is the connection between the slope of the density profile and the velocity anisotropy. These findings provide us with a powerful tool, which allows us to close the Jeans equations.
description: 10 pages, 7 figures, subm to apj
Tidal Streams of Intracluster Light
Creators: name: Rudick, Craig S.
name: Mihos, J. Christopher
name: Frey, Lucille H.
name: McBride, Cameron K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Using N-body simulations, we have modeled the production and evolution of substructures in the intracluster light (ICL) of a simulated galaxy cluster. We use a density-based definition of ICL, where ICL consists of luminous particles which are at low densities, to identify ICL particles and track their evolution. We have implemented a friends-of-friends-type clustering algorithm which finds groups of particles correlated in both position and velocity space to identify substructures in the ICL, hereafter referred to as ``streams''. We find that ~40% of the cluster's ICL is generated in the form of these massive (M > 7.0x10^8 Msun), dynamically cold streams. The fraction of the ICL generated in streams is greater early in the cluster's evolution, when galaxies are interacting in the group environment, than later in its evolution when the massive cluster potential has been assembled. The production of streams requires the strong tidal fields associated with close interactions between pairs of galaxies, and is usually associated with merging pairs of galaxies, or fast, close encounters with the cluster's central galaxy. Once streams are formed, they begin to decay as they are disrupted by the tidal field of the cluster. We find that streams have decay timescales which are ~1.5 times their dynamical time in the cluster.
description: 14 pages, 9 figures (includes 2 color figures). Accepted for publication in the Astrophysical Journal
CITP SOP Sitagliptin
Creators: name: Caenorhabditis Intervention Testing Program
Publisher: name: figshare
Year: 2021
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology

description: The Caenorhabditis Intervention Testing Program (CITP) is a multi-institutional program that seeks robust and reproducible pro-longevity interventions that are efficacious across genetically diverse cohorts in the Caenorhabditis genus. The project features a unique design in which multiple experimental replicates are collected by three different laboratories at discrete locations for all candidate compounds tested. To limit confounding factors that may influence experimental reproducibility, we develop standardized operating procedures (SOPs) for all experimental procedures. Here we provide the CITP SOP for the compound Sitagliptin.
Efficient and practical Hamiltonian simulation from time-dependent product formulas
Creators: name: Bosse, Jan Lukas
name: Childs, Andrew M.
name: Derby, Charles
name: Gambetta, Filippo Maria
name: Montanaro, Ashley
name: Santos, Raul A.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: In this work we propose an approach for implementing time-evolution of a quantum system using product formulas. The quantum algorithms we develop have provably better scaling (in terms of gate complexity and circuit depth) than a naive application of well-known Trotter formulas, for systems where the evolution is determined by a Hamiltonian with different energy scales (i.e., one part is "large" and another part is "small"). Our algorithms generate a decomposition of the evolution operator into a product of simple unitaries that are directly implementable on a quantum computer. Although the theoretical scaling is suboptimal compared with state-of-the-art algorithms (e.g., quantum signal processing), the performance of the algorithms we propose is highly competitive in practice. We illustrate this via extensive numerical simulations for several models. For instance, in the strong-field regime of the 1D transverse-field Ising model, our algorithms achieve an improvement of one order of magnitude in both the system size and evolution time that can be simulated with a fixed budget of 1000 arbitrary 2-qubit gates, compared with standard Trotter formulas.
description: 39 pages, 14 figures, 4 tables
CITP SOP Pioglitazone
Creators: name: Caenorhabditis Intervention Testing Program
Publisher: name: figshare
Year: 2021
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology

description: The Caenorhabditis Intervention Testing Program (CITP) is a multi-institutional program that seeks robust and reproducible pro-longevity interventions that are efficacious across genetically diverse cohorts in the Caenorhabditis genus. The project features a unique design in which multiple experimental replicates are collected by three different laboratories at discrete locations for all candidate compounds tested. To limit confounding factors that may influence experimental reproducibility, we develop standardized operating procedures (SOPs) for all experimental procedures. Here we provide the CITP SOP for the compound Pioglitazone.
The Properties of the Heterogeneous Shakhbazyan Groups of Galaxies in the SDSS
Creators: name: Capozzi, D.
name: De Filippis, E.
name: Paolillo, M.
name: D'Abrusco, R.
name: Longo, G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a systematic study of the sub-sample of Shakhbazyan groups (SHKs) covered by the Sloan Digital Sky Survey Data Release--5 (SDSS-5). SHKs probe an environment with characteristics which are intermediate between those of loose and very compact groups. Surprisingly, we found that several groups identifying algorithms (e.g. Berlind et al. 2006, Tago et al. 2008) miss this type of structures. Using the SDSS-5 spectroscopic data and the photometric redshifts derived in D'Abrusco et al. 2007, we identified possible group members in photometric redshift space and derived, for each group, several individual properties. We also combined pointed and stacked Rosat All Sky Survey data to investigate the X-ray luminosities of these systems. Our study confirms that the majority of groups are physical entities with richness in the range 3--13 galaxies, and properties ranging between those of loose and compact groups. We confirm that SHK groups are richer in early-type galaxies than the surrounding environment and the field, as expected from the morphology-density relation and from the selection of groups of red galaxies. Furthermore, our work supports the existence of two sub-classes of structures, the first one being formed by compact and isolated groups and the second formed by extended structures. We suggest that while the first class of objects dwells in less dense regions like the outer parts of clusters or the field, possibly sharing the properties of Hickson Compact Groups, the more extended structures represent a mixture of [core+halo] configurations and cores of rich clusters. X-ray luminosities for SHKs are generally consistent with these results and with the expectations for the L_X-sigma_v relation, but also suggest the velocity dispersions reported in literature are underestimated for some of the richest systems.
description: 20 pages, 14 figures, 4 tables. Accepted for publication by MNRAS
CITP SOP Nateglinide
Creators: name: Caenorhabditis Intervention Testing Program
Publisher: name: figshare
Year: 2021
Subjects: subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology

description: The Caenorhabditis Intervention Testing Program (CITP) is a multi-institutional program that seeks robust and reproducible pro-longevity interventions that are efficacious across genetically diverse cohorts in the Caenorhabditis genus. The project features a unique design in which multiple experimental replicates are collected by three different laboratories at discrete locations for all candidate compounds tested. To limit confounding factors that may influence experimental reproducibility, we develop standardized operating procedures (SOPs) for all experimental procedures. Here we provide the CITP SOP for the compound Nateglinide.
Magnetic excitations in Kondo liquid: Superconductivity and Hidden Magnetic Quantum Critical Fluctuations
Creators: name: Yang, Yi-feng
name: Urbano, Ricardo
name: Curro, Nicholas J.
name: Pines, David
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We report Knight shift experiments on the superconducting heavy electron material CeCoIn$_5$ that allow one to track with some precision the behavior of the heavy electron Kondo liquid in the superconducting state with results in agreement with BCS theory. An analysis of the $^{115}$In nuclear quadrupole resonance (NQR) spin-lattice relaxation rate $T_1^{-1}$ measurements under pressure reveals the presence of 2d magnetic quantum critical fluctuations in the heavy electron component that are a promising candidate for the pairing mechanism in this material. Our results are consistent with an antiferromagnetic quantum critical point (QCP) located at slightly negative pressure in CeCoIn$_5$ and provide additional evidence for significant similarities between the heavy electron materials and the high $T_c$ cuprates.
description: 4 pages, 4 figures
Analyses according to the preregistration from Instructing somebody else to act: motor co-representations in the instructor
Creators: name: Van der Biest, Mathias
name: Pedinoff, Rebecca
name: Verbruggen, Frederick
name: Brass, Marcel
name: Kuhlen, Anna K.
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310901
subject: Animal behaviour
classificationCode: 520499
subject: Cognitive and computational psychology not elsewhere classified
classificationCode: 529999
subject: Other psychology not elsewhere classified

description: In the supplementary materials, you can find the results of the analyses following the preregistration (i.e. Experiment 2).
The GALEX Arecibo SDSS Survey. I. Gas Fraction Scaling Relations of Massive Galaxies and First Data Release
Creators: name: Catinella, Barbara
name: Schiminovich, David
name: Kauffmann, Guinevere
name: Fabello, Silvia
name: Wang, Jing
name: Hummels, Cameron
name: Lemonias, Jenna
name: Moran, Sean M.
name: Wu, Ronin
name: Giovanelli, Riccardo
name: Haynes, Martha P.
name: Heckman, Timothy M.
name: Basu-Zych, Antara R.
name: Blanton, Michael R.
name: Brinchmann, Jarle
name: Budavári, Tamás
name: Gonçalves, Thiago
name: Johnson, Benjamin D.
name: Kennicutt, Robert C.
name: Madore, Barry F.
name: Martin, Christopher D.
name: Rich, Michael R.
name: Tacconi, Linda J.
name: Thilker, David A.
name: Wild, Vivienne
name: Wyder, Ted K.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We introduce the GALEX Arecibo SDSS Survey (GASS), an on-going large program that is gathering high quality HI-line spectra using the Arecibo radio telescope for an unbiased sample of ~1000 galaxies with stellar masses greater than 10^10 Msun and redshifts 0.025
description: 25 pages, 12 figures. Accepted for publication in MNRAS. Version with high resolution figures available at http://www.mpa-garching.mpg.de/GASS/pubs.php
Investigating the atmospheric ice nucleation mechanism of biomass burning organic aerosols using synthesized and size-resolved lignin nanoparticles
Creators: name: Zeleny, Anna T.
Publisher: name: University of British Columbia
Year: 2024

description: Mixed-phase clouds are important climate regulators, providing significant annual precipitation and global cloud coverage. An increase in wildfires in the past decade is changing cloud cover and cloud composition which are currently difficult to predict due to a lack of mechanistic understanding. Although there is evidence of the ability of organic aerosols to nucleate ice under mixed-phase cloud conditions, the underlying physicochemical mechanism through which organic materials promote ice nucleation is an active area of research. The goal of this thesis is to study the mechanism through which lignin, and, by extension, biomass burning organic aerosols, nucleate ice in the atmosphere. To determine ice activity of lignin, we employ a bottom-up approach by synthesizing lignin nanoparticles (LNPs). LNPs have controllable, measurable, characteristics; valuable for elucidating the mechanism of ice nucleation of lignin. To determine the role of size and surface properties, we synthesized lignin nanoparticles (LNPs) from commercially available Kraft lignin and tested their freezing ability in our home-built Freezing Ice Nuclei Counter (FINC). LNPs were characterized for their size and dispersity with dynamic light scattering (DLS). Transmission Electron Microscopy (TEM) provided additional confirmation of shape and dispersity. We then prepared LNP solutions of different sizes at equal concentration via thermogravimetric analysis (TGA) to isolate the role of size on ice nucleation. Our FINC and DFA results confirmed that lignin nanoparticles, ranging in size from 80 – 500 d.nm, at the same concentration (0.2 mg/mL) are ice active with T\textsubscript{50} values ranging from -14.96 to -15.91 ºC. We found that few large LNPs nucleate ice with the same ability as many small LNPs. Normalizing the freezing data to mass and number suggests that aggregation facilitates ice nucleation of LNPs in the 10s and 100s of nanometers in size. From this research, we further contribute to the growing literature suggesting the key role of aggregation, and therefore likely of chemical composition on organic aerosols' ability to nucleate ice. These findings help understand how lignin within wildfire organic aerosols are able to nucleate ice and hence impact the ice crystal concentration in mixed-phase clouds.