cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Convolutional Neural Network Simplification with Progressive Retraining
Creators: name: Osaku, D.
name: Gomes, J. F.
name: Falcão, A. X.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Kernel pruning methods have been proposed to speed up, simplify, and improve explanation of convolutional neural network (CNN) models. However, the effectiveness of a simplified model is often below the original one. In this letter, we present new methods based on objective and subjective relevance criteria for kernel elimination in a layer-by-layer fashion. During the process, a CNN model is retrained only when the current layer is entirely simplified, by adjusting the weights from the next layer to the first one and preserving weights of subsequent layers not involved in the process. We call this strategy \emph{progressive retraining}, differently from kernel pruning methods that usually retrain the entire model after each simplification action -- e.g., the elimination of one or a few kernels. Our subjective relevance criterion exploits the ability of humans in recognizing visual patterns and improves the designer's understanding of the simplification process. The combination of suitable relevance criteria and progressive retraining shows that our methods can increase effectiveness with considerable model simplification. We also demonstrate that our methods can provide better results than two popular ones and another one from the state-of-the-art using four challenging image datasets.
description: 7 pages, 4 figures. This paper was submitted to Pattern Recognition Letters
A dark energy multiverse
Creators: name: Robles-Perez, Salvador
name: Martin-Moruno, Prado
name: Rozas-Fernandez, Alberto
name: Gonzalez-Diaz, Pedro F.
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present cosmic solutions corresponding to universes filled with dark and phantom energy, all having a negative cosmological constant. All such solutions contain infinite singularities, successively and equally distributed along time, which can be either big bang/crunchs or big rips singularities. Classicaly these solutions can be regarded as associated with multiverse scenarios, being those corresponding to phantom energy that may describe the current accelerating universe.
Bohr-Heisenberg Reality and System-Free Quantum Mechanics
Creators: name: Jaroszkiewicz, George
name: Eakins, Jon
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Motivated by Heisenberg's assertion that electron trajectories do not exist until they are observed, we present a new approach to quantum mechanics in which the concept of observer independent system under observation is eliminated. Instead, the focus is only on observers and apparatus, the former describing the latter in terms of labstates. These are quantum states over time-dependent Heisenberg nets, which are quantum registers of qubits representing information gateways accessible to the observers. We discuss the motivation for this approach and lay down the basic principles and mathematical notation.
description: 10 pages, submitted to Proceedings of Foundations of Probability and Physics -4, June 4-9, 2006, Vaxjo, Sweden
Effect of light injection on the security of practical quantum key distribution
Creators: name: Han, Liying
name: Li, Yang
name: Tan, Hao
name: Zhang, Weiyang
name: Cai, Wenqi
name: Yin, Juan
name: Ren, Jigang
name: Xu, Feihu
name: Liao, Shengkai
name: Peng, Chengzhi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum key distribution (QKD) based on the fundamental laws of quantum physics can allow the distribution of secure keys between distant users. However, the imperfections in realistic devices may lead to potential security risks, which must be accurately characterized and considered in practical security analysis. High-speed optical modulators, being as one of the core components of practical QKD systems, can be used to prepare the required quantum states. Here, we find that optical modulators based on LiNbO3, including phase modulators and intensity modulators, are vulnerable to photorefractive effect caused by external light injection. By changing the power of external light, eavesdroppers can control the intensities of the prepared states, posing a potential threat to the security of QKD. We have experimentally demonstrated the influence of light injection on LiNbO3-based optical modulators and analyzed the security risks caused by the potential green light injection attack, along with the corresponding countermeasures.
Novel Clinical Roles for Junctional Adhesion Molecule-A in Breast Cancer Progression and Targeted Therapy-Associated Morbidities
Creators: name: Rutherford, Emily
Publisher: name: Royal College of Surgeons in Ireland
Year: 2021
Subjects: subject: 111204 Cancer Therapy (excl. Chemotherapy and Radiation Therapy)
subject: FOS: Clinical medicine
subject: Cancer

description: Although considerable progress has been made in breast cancer diagnosis and management, it remains a leading cause of morbidity and mortality. Furthermore, drug resistance and treatment-related adverse events are ongoing clinical issues. This thesis explores emerging roles for an adhesion protein, Junctional Adhesion Molecule-A (JAM-A) in breast cancer pathogenesis, the monitoring of response to treatment, and in treatment-associated morbidities.Methods and Results: JAM-A can exist in either its nativemembrane-tethered configuration, or as an extracellularly-cleaved soluble protein termed cleaved JAM-A (cJAM-A). A combination of epidemiological and basic scientific investigations were employed to elucidate a role for different forms of JAM-A in breast cancer.Epidemiological studies: This thesis revealed that high blood levels of cJAM-A correlated significantly with adverse outcomes in two independent cohorts of breast cancer patients. Despite known roles for cJAM-A in vascular function, adverse clinical events such as cardiotoxicity and thrombosis were infrequent in our cohorts and thus did not yield any correlation with cJAM-A levels. However, in relation to cardiotoxicity monitoring, deficits in knowledge and areas for clinical education in a group of trainee clinicians were identified.Laboratory studies: Given the association between cJAM-A levels and poor patient outcomes, we tested if cJAM-A acted as a ligand driving pro-tumourigenic events. Recombinant cJAM-A (rcJAM-A) was rapidly internalised into breast cancer cells independently of macro- and micro-pinocytosis; furthermore, rcJAM-A stimulated breast cancer cellular proliferation in vitro. In a semi-in vivo chick embryo xenograft model, rcJAM-A significantly increased tumour size, and inhibition of JAM-A cleavage tended to reduce the formation of grossly visible xenograft tumours. Together with the fact that overexpression of membranous JAM-A was sufficient to increase the size of xenograft tumours; our results are consistent with novel potential roles for both forms of JAM-A in breast cancer.Conclusion: Overall, the findings from this thesis in models spanning in vitro and semi-in vivo settings with translation into patient-centred contexts suggest that JAM-A holds promise as both a biomarker of breast cancer progression and a potential pharmacological target worthy of future research.
The Interstellar Medium of Quiescent Galaxies and its Evolution With Time
Creators: name: Magdis, Georgios E.
name: Gobat, R.
name: Valentino, F.
name: Daddi, E.
name: Zanella, A.
name: Kokorev, V.
name: Toft, S.
name: Jin, S.
name: Whitaker, K.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We characterise the basic far-IR (FIR) properties and the gas mass fraction of massive ( ~ 11.0) quiescent galaxies (QGs) and explore how these evolve from z = 2.0 to the present day. We use robust, multi-wavelength (mid- to far-IR and sub-millimetre to radio) stacking ensembles of homogeneously selected and mass complete samples of log(M*/Msun) > 10.8 QGs. We find that the dust to stellar mass ratio (Md/M*) rises steeply as a function of redshift up to z~1.0 and then remains flat at least out to z = 2.0. Using Md as a proxy of gas mass (Mgas), we find a similar trend for the evolution of the gas mass fraction (fgas) with z > 1.0 QGs having fgas ~ 7.0% (for solar metallicity). This fgas is 3 - 10 times lower than that of normal star forming galaxies (SFGs) at their corresponding redshift but ~3 and ~10 times larger compared to that of z = 0.5 and local QGs. Furthermore, the inferred gas depletion time scales are comparable to that of local SFGs and systematically longer than that of main sequence galaxies at their corresponding redshifts. Our analysis also reveals that the average dust temperature (Td) of massive QGs remains roughly constant (< Td > = 21.0 \pm 2.0K) at least out to z ~ 2.0 and is substantially colder (~ 10K) compared to that of z > 0 SFGs. This motivated us to construct and release a redshift-invariant template IR SED, that we use to make predictions for ALMA observations and to explore systematic effects in the Mgas estimates of massive, high-z QGs. Finally, we discuss how a simple model that considers progenitor-bias can effectively reproduce the observed evolution of Md/M* and fgas. Our results indicate universal initial interstellar medium conditions for quenched galaxies and a large degree of uniformity in their internal processes across cosmic time.
description: Accepted for publication in A&A
Behaviour and reliability of wood tension members exposed to elevated temperatures
Creators: name: Lau, Peter Wing Cheong
Publisher: name: University of British Columbia
Year: 2009

description: The merit of approaching fire safety design from the standpoint of reliability is the impetus of this thesis. Reliability, a direct function of time to failure, is a measure of performance which falls naturally under a performance-based code. The objectives of this study focus on advancing our understanding of the structural behaviour of light-frame wood members subject to tension and elevated temperatures, on actual strengths of brittle materials and how these strengths are affected by time at elevated temperatures, and on the time to failure under a given stress-and-temperature history. A model based on linear damage accumulation theory was developed to predict the time to failure. This model is based on a kinetic theory for strength loss as a function of temperature and stress histories, coupled with a kinetic term, to express the pyrolytic process as a form of damage. The model has four independent parameters and requires the short-term strength of the member as an input. This model fits well to experimental data on nominal 2x4 structural lumber tested at three different rates of loading under tension, and at four temperatures, 150, 200 and 250°C, and room temperature. The model also predicts, with reasonable accuracy, the behaviour of lumber under constant load at 250°C. In analyzing the rate-of-loading effect on lumber at elevated temperatures and the reliability as affected by lumber grade, the model predicts that the rate-of-loading effect becomes increasingly significant as temperature is increased. It also predicts that lower-grade material, when subject to a constant tension stress, has a lower reliability index at elevated temperatures up to 250°C. The differences, however, are expected to be insignificant based on current design practices. Temperature effects on strength are approximately linear at temperatures up to 150°C. Above 150°C durations becomes as dominant a factor as temperature. Based on a comparison with existing data, lumber at 9-11% moisture content is more adversely affected by temperature than small, dry, clear specimens.
Early Results from GLASS-JWST XXIII: The transmission of Lyman-alpha from UV-faint z ~ 3-6 galaxies
Creators: name: Prieto-Lyon, Gonzalo
name: Mason, Charlotte
name: Mascia, Sara
name: Merlin, Emiliano
name: Roy, Namrata
name: Henry, Alaina
name: Roberts-Borsani, Guido
name: Morishita, Takahiro
name: Wang, Xin
name: Boyett, Kit
name: Bolan, Patricia
name: Bradac, Marusa
name: Castellano, Marco
name: Mercurio, Amata
name: Nanayakkara, Themiya
name: Paris, Diego
name: Pentericci, Laura
name: Scarlata, Claudia
name: Trenti, Michele
name: Treu, Tommaso
name: Vanzella, Eros
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Lyman-alpha (Ly$α$) emission from galaxies can be used to trace neutral hydrogen in the epoch of reionization, however, there is a degeneracy between the attenuation of Ly$α$ in the intergalactic medium (IGM) and the line profile emitted from the galaxy. Large shifts of Ly$α$ redward of systemic due to scattering in the interstellar medium can boost Ly$α$ transmission in the IGM during reionization. The relationship between Ly$α$ velocity offset from systemic and other galaxy properties is not well-established at high-redshift or low luminosities, due to the difficulty of observing emission lines which trace systemic redshift. Rest-frame optical spectroscopy with JWST/NIRSpec has opened a new window into understanding of Ly$α$ at z>3. We present a sample of 12 UV-faint galaxies ($-20 \lesssim$ MUV $\lesssim -16$) at $3 \lesssim z \lesssim 6$, with Ly$α$ velocity offsets, $Δv_{\mathrm{Ly}α}$, measured from VLT/MUSE and JWST/NIRSpec from the GLASS-JWST Early Release Program. We find median $Δv_{\mathrm{Ly}α}$ of 205 km s$^{-1}$ and standard deviation 75 km s$^{-1}$, compared to 320 and 170km s$^{-1}$ for MUV < -20 galaxies in the literature. Our new sample demonstrates the previously observed trend of decreasing Ly$α$ velocity offset with decreasing UV luminosity and optical line velocity dispersion, extends to MUV $\gtrsim$ -20, consistent with a picture where the Ly$α$ profile is shaped by gas close to the systemic redshift. Our results imply that during reionization Ly$α$ from UV-faint galaxies will be preferentially attenuated, but that detecting Ly$α$ with low $Δv_{\mathrm{Ly}α}$ can be an indicator of large ionized bubbles.
description: 13 pages, 4 figures
A Photoinduced Floquet Mixed-Weyl Semimetallic Phase in a Carbon Allotrope
Creators: name: Deng, Tingwei
name: Zheng, Baobing
name: Zhan, Fangyang
name: Fan, Jing
name: Wu, Xiaozhi
name: Wang, Rui
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The interplay between light and matter attracts tremendous interest for exploring novel topological quantum states and their phase transitions. Here we show by first-principles calculations and the Floquet theorem that a carbon allotrope bct-C$_{16}$, a typical nodal-line semimetal, exhibits exotic photoinduced Floquet mixed-Weyl semimetallic features. Under the irradiation of a linearly polarized light, bct-C$_{16}$ undergos a topological phase transition from a Driac nodal-line semimetal to a Weyl semimetal with two pairs of tunable Weyl points. With increasing the light intensity, left-handed Weyl points evolve from type-I into type-II while right-handed ones are always preserved to be type-I, giving rise to photo-dressed unconventional Weyl pairs composed of distinct types of Weyl points. Importantly, a special Weyl pair formed by type-I and type-III Weyl points is present at the boundary between type-I and type-II states. The Floquet Fermi arcs connecting the projections of two different types of Weyl points are clearly visible, further revealing their unique topological features. Our work not only realizes promising unconventional Weyl pairs but also paves a reliable avenue for investigating light-induced topological phase transitions.
description: 10 pages, 7 figures
Decoherence under many-body system-environment interactions: a stroboscopic representation based on a fictitiously homogenized interaction rate
Creators: name: Alvarez, Gonzalo A.
name: Danieli, Ernesto P.
name: Levstein, Patricia R.
name: Pastawski, Horacio M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Chemical Physics (physics.chem-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An environment interacting with portions of a system leads to multiexponential interaction rates. Within the Keldysh formalism, we fictitiously homogenize the system-environment interaction yielding a uniform decay rate facilitating the evaluation of the propagators. Through an injection procedure we neutralize the fictitious interactions. This technique justifies a stroboscopic representation of the system-environment interaction which is useful for numerical implementation and converges to the natural continuous process. We apply this procedure to a fermionic two-level system and use the Jordan-Wigner transformation to solve a two-spin swapping gate in the presence of a spin environment.
description: 11 pages, 3 figures, title changed, some typos changed
Testing the first-order separability hypothesis for spatio-temporal point patterns
Creators: name: Ghorbani, Mohammad
name: Vafaei, Nafiseh
name: Dvořák, Jiří
name: Myllymäki, Mari
Publisher: name: arXiv
Year: 2020
Subjects: subject: Methodology (stat.ME)
subject: Statistics Theory (math.ST)
subject: Applications (stat.AP)
subject: Other Statistics (stat.OT)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: First-order separability of a spatio-temporal point process plays a fundamental role in the analysis of spatio-temporal point pattern data. While it is often a convenient assumption that simplifies the analysis greatly, existing non-separable structures should be accounted for in the model construction. We propose three different tests to investigate this hypothesis as a step of preliminary data analysis. The first two tests are exact or asymptotically exact for Poisson processes. The first test based on permutations and global envelopes allows us to detect at which spatial and temporal locations or lags the data deviate from the null hypothesis. The second test is a simple and computationally cheap $χ^2$-test. The third test is based on statistical reconstruction method and can be generally applied for non-Poisson processes. The performance of the first two tests is studied in a simulation study for Poisson and non-Poisson models. The third test is applied to the real data of the UK 2001 epidemic foot and mouth disease.
description: 21 pages, 8 Figures (21 plots)
The AAT/WFI survey of the Monoceros Ring and Canis Major Dwarf galaxy: I. from l = (193 - 276)o
Creators: name: Conn, Blair C.
name: Lane, Richard R.
name: Lewis, Geraint F.
name: Gil-Merino, Rodrigo
name: Irwin, Mike J.
name: Ibata, Rodrigo A.
name: Martin, Nicolas F.
name: Bellazzini, Michele
name: Sharp, Robert
name: Tuntsov, Artem V.
name: Ferguson, Annette M. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of an AAT wide-field camera survey of the stars in the Monoceros Ring and purported Canis Major overdensity in the Galactic longitudes of {\it l} = (193 - 276)$^\circ$. Current numerical simulations suggest that both of these structures are the result of a single on-going accretion event, although an alternative solution is that the warped and flared disc of the Galaxy can explain the origin of both of these structures. Our results show that, with regards the Monoceros Ring, the warped and flared disc is unable to reproduce the locations and strengths of the detections observed around the Galaxy. This supports a non-Galactic origin for this structure. We report 8 new detections and 2 tentative detections of the Monoceros Ring in this survey. The exact nature of the Canis Major overdensity is still unresolved although this survey provides evidence that invoking the Galactic warp is not a sufficient solution when compared with observation. Several fields in this survey are highly inconsistent with the current Galactic disc models that include a warp and flare, to such an extent that explaining their origins with these structures is problematic. (Abridged)
description: 22 pages, lots of figures (reduced in quality for astro-ph submission). Accepted for publication in MNRAS
Dark matter search with CMB: a study of foregrounds
Creators: name: Zhang, Zi-Xuan
name: Wang, Yi-Ming
name: Cang, Junsong
name: Zhang, Zirui
name: Liu, Yang
name: Li, Si-Yu
name: Gao, Yu
name: Li, Hong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The energy injected from dark matter annihilation and decay processes potentially raises the ionisation of the intergalactic medium and leaves visible footprints on the anisotropy maps of the cosmic microwave background (CMB). Galactic foregrounds emission in the microwave bands contaminate the CMB measurement and may affect the search for dark matter's signature. In this paper, we construct a full CMB data and foreground simulation based on the design of the next-generation ground-based CMB experiments. The foreground residual after the components separation on maps is fully considered in our data analysis, accounting for various contamination from the emission of synchrotron, thermal dust, free-free and spinning dust. We analyse the corresponding sensitivity on dark matter parameters from the temperature and polarization maps, and we find that the CMB foregrounds leave a non-zero yet controllable impact on the sensitivity. Comparing with statistics-only analysis, the CMB foreground residual leads to a factor of at most 19% weakening on energy-injection constraints, depending on the specific dark matter process and experimental configuration. Strong limits on dark matter annihilation rate and decay lifetime can be expected after foreground subtraction.
description: 6 figures, 2 tables. The foreground, mask maps and simulated datasets used in this work are available at https://github.com/Junsong-Cang/DM_CMB_Forecast
Forschungsdatenmanagement am Ubiquitous Knowledge Processing Lab (UKP)
Creators: name: Lee, Ji-Ung
name: Gurevych, Iryna
Publisher: name: Zenodo
Year: 2020
Subjects: FDM
Forschungsdatenmanagement
Hessische Forschungsdateninfrastrukturen
NFDI
Nationale Forschungsdateninfrastrukturen
Ubiquitous Knowledge Processing (UKP) Lab
Präsentation
HeFDI Plenary 2020

description: Poster über das Forschungsdatenmanagement am Ubiquitous Knowledge Processing (UKP) Lab, präsentiert auf dem HeFDI Plenary 2020.
Manifest electric-magnetic duality in linearized conformal gravity
Creators: name: Snethlage, Hapé Fuhri
name: Hörtner, Sergio
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We derive a manifestly duality-symmetric formulation of the action principle for conformal gravity linearized around Minkowski space-time. The analysis is performed in the Hamiltonian formulation, the fourth-order character of the equations of motion requiring the formal treatment of the three-dimensional metric perturbation and the extrinsic curvature as independent dynamical variables. The constraints are solved in terms of two symmetric potentials that are interpreted as a dual three-dimensional metric and a dual extrinsic curvature. The action principle can be written in terms of these four dynamical variables, duality acting as simultaneous rotations in the respective spaces spanned by the three-dimensional metrics and the extrinsic curvatures. A twisted self-duality formulation of the equations of motion is also provided.
Boundary-integral method for poloidal axisymmetric AC magnetic fields
Creators: name: Priede, J.
name: Gerbeth, G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: This paper presents a boundary-integral equation (BIE) method for the calculation of poloidal axisymmetric magnetic fields applicable in a wide range of ac frequencies. The method is based on the vector potential formulation and it uses the Green's functions of Laplace and Helmholtz equations for the exterior and interior of conductors, respectively. The work is particularly focused on a calculation of axisymmetric Green's function for the Helmholtz equation which is both simpler and more accurate compared to previous approaches. Three different approaches are used for calculation of the Green's function depending on the parameter range. For low and high dimensionless ac frequencies we use a power series expansion in terms of elliptical integrals and an asymptotic series in terms of modified Bessel functions of second kind, respectively. For the intermediate frequency range, Gauss-Chebyshev-Lobatto quadratures are used. The method is verified by comparing with the analytical solution for a sphere in a uniform external ac field. The application of the method is demonstrated for a composite model inductor containing an external secondary circuit.
description: 8 pages, 4 figures
Actively controllable topological phase transition in phononic beam systems
Creators: name: Zhou, Weijian
name: Chen, Weiqiu
name: Destrade, Michel
name: Lim, C. W.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Applied Physics (physics.app-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Topological insulators, which allow edge or interface waves but forbid bulk waves, have revolutionized our scientific cognition of acoustic/elastic systems. Due to their nontrivial topological characteristics, edge (interface)waves are topologically protected against defects and disorders. This superior and unique characteristic could lead to a wealth of new opportunities in applications of quantum and acoustic/elastic information processing. However, current acoustic/elastic topological insulators are still at an infancy stage where the theory and prediction only work in laboratories and there are still many problems left open before promoting their practical applications. One of the apparent disadvantages is their narrow working frequency range, which is the main concern in this paper. We design a one-dimensional phononic beam system made of a homogeneous epoxy central beam sandwiched by two homogeneous piezoelectric beams, and covered with extremely thin electrodes, periodically and separately placed. These electrodes are connected to external electric circuits with negative capacitors. We show that a topological phase transition can be induced and tuned by changing the values of the negative capacitors. It follows that the working frequency of the topologically protected interface mode can be widely changed, such that the working frequency range of the topological insulator can be considerably `broadened'. This intelligent topological device may also find wide applications in intelligent technologies that need controllable information processing of high precision.
The Current Situation of Aging Japanese Retirees and Their Impacts on Medical Services in Chiang Mai Province, Thailand
Creators: name: Nishikito, Elisa
Publisher: name: สมาคมญี่ปุ่นศึกษาแห่งประเทศไทย
Year: 2020
Subjects: aging Japanese retirees
impacts
medical services
Chiang Mai

description: วารสารเครือข่ายญี่ปุ่นศึกษา, 10, 2, 100-118
บทวิจารณ์หนังสือภาพลักษณ์พ่อแม่ลูกญี่ปุ่น
Creators: name: อรรถยา สุวรรณระดา
Publisher: name: สมาคมญี่ปุ่นศึกษาแห่งประเทศไทย
Year: 2020
Subjects: -

description: วารสารเครือข่ายญี่ปุ่นศึกษา, 10, 2, 119-122
An extended $k-\varepsilon$ model for wake-flow simulation of wind farms
Creators: name: Zehtabiyan-Rezaie, Navid
name: Abkar, Mahdi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The Reynolds-averaged Navier-Stokes approach coupled with the standard $k-\varepsilon$ model is widely utilized for wind-energy applications. However, it has been shown that the standard $k-\varepsilon$ model overestimates the turbulence intensity in the wake region and, consequently, overpredicts the power output of the waked turbines. This study focuses on the development of an extended $k-\varepsilon$ model by incorporating an additional term in the turbulent kinetic energy equation. This term accounts for the influence of turbine-induced forces, and its formulation is derived through an analytical approach. To assess the effectiveness of the proposed model, we begin by analyzing the evolution of normalized velocity deficit and turbulence intensity in the wake region, and the normalized power of the waked turbines. This investigation involves a comparison of the predictions against results from large-eddy simulations in three validation cases with different layouts. We then simulate a wind farm consisting of 30 wind turbines and conduct a comparative analysis between the model-predicted normalized streamwise velocity and wind-tunnel measurements. Finally, to conclude our assessment of the proposed model, we apply it to the operational wind farm of Horns Rev 1 and evaluate the obtained normalized power with the results from large-eddy simulations. The comparisons and validations conducted in this study prove the superior performance of the extended $k-\varepsilon$ model compared to the standard version.
description: 14 pages, 14 figures
Tailoring galaxies: size-luminosity-surface brightness relations of bulges and disks along the morphological sequence
Creators: name: Quilley, Louis
name: de Lapparent, Valérie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We measure the scaling relations of the bulges and disks of the EFIGI galaxies in the nearby Universe versus morphology, using bulge and disk decomposition of SDSS gri images with SourceXtractor++. The Kormendy (1977) relation between effective surface brightness and effective radius of E galaxies extends to the bulges of types S0 to Sb, whereas fainter and smaller bulges of later Hubble types depart from it, with decreasing bulge-to-total ratio (B/T) and Sérsic indices. There is a continuous transition from pseudo-bulges to classical ones, proposed to occur for g magnitudes between -17.8 to -19.1. The size-luminosity relations for E and dE types are steeper and similar to those from Binggeli et al. (1984), resp., below which EFIGI lenticular and spiral bulges display a curved relation. The disks and irregulars also follow a continuous curved size-luminosity relation such that while they grow, they first brighten and then stabilize in surface brightness. Moreover, we obtain the unprecedented result that the effective radii of both the bulges and disks of spirals increase as power-laws of B/T, with a steeper increase for the bulges. The increase with B/T is much steeper and similar for the bulges and disks of lenticulars. The ratio of disk-to-bulge effective radii varies accordingly across 2 orders of magnitude in B/T for all lenticular and spiral types, with a mean disk-to-bulge ratio decreasing from ~15 for Sbc to Scd types to ~6 for S0. We tabulate all derived scaling relations, so that they can be used to build realistic mock images of nearby galaxies. The new curved size-luminosity relations will prevent over or under estimates of bulge, disk and galaxy sizes at all magnitudes. These results complement the analysis of Quilley & de Lapparent (2022) by providing the joint size and luminosity variations of bulges and disks, as they evolve reversely along the Hubble sequence.
description: Published in A&A. 29 pages, 17 figures
X(2900) in a chiral quark model
Creators: name: Tan, Yue
name: Ping, Jialun
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Recently, the LHCb Collaboration reported their observation of the first two fully open-flavor tetraquark states named $X_0(2900)$ and $X_1(2900)$ with unknown parity. Inspired by the report, we consider all of possible four-quark candidates of $X(2900)$ including molecular structure and diquark structure in a chiral quark model with the help of Gaussian expansion method. Two different structures coupling is also considered. To identify the genuine resonances, real-scaling method (stabilization method) was employed. The results show that no candidate of $X(2900)$ is founded in $00^+$ and $01^+$ $cs\bar{q}\bar{q}$ system below the threshold of $D^*\bar{K}^*$, while there are two states in the $P$-wave excited $cs\bar{q}\bar{q}$ system, $D_1\bar{K}$ and $D_J\bar{K}$, which could be candidates of $X(2900)$. In this way, we assign negative parity to $X_1(2900)$, and $X_0(2900)$ maybe a resonance state above the threshold of $D^*\bar{K}^*$, more calculation is needed.
description: 7 pages, 4 figures
DISTINCT T CELL CLONES ARE ASSOCIATED WITH GRAFT-VERSUS-HOST DISEASE (GVHD), AND POTENTIALLY GRAFT-VERSUS-TUMOR (GVT), RESPONSES FOLLOWING ALLOGENEIC STEM CELL TRANSPLANTATION
Creators: name: Berrie, Jennifer
Publisher: name: VCU Libraries
Year: 2011

description: VCU Theses and Dissertations
Hilbert Space Fragmentation in Open Quantum Systems
Creators: name: Li, Yahui
name: Sala, Pablo
name: Pollmann, Frank
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We investigate the phenomenon of Hilbert space fragmentation (HSF) in open quantum systems and find that it can stabilize highly entangled steady states. For concreteness, we consider the Temperley-Lieb model, which exhibits quantum HSF in an entangled basis, and investigate the Lindblad dynamics under two different couplings. First, we couple the system to a dephasing bath that reduces quantum fragmentation to a classical one with the resulting stationary state being separable. We observe that despite vanishing quantum correlations, classical correlations develop due to fluctuations of the remaining conserved quantities, which we show can be captured by a classical stochastic circuit evolution. Second, we use a coupling that preserves the quantum fragmentation structure. We derive a general expression for the steady state, which has a strong coherent memory of the initial state due to the extensive number of non-commuting conserved quantities. We show that it is highly entangled as quantified by the logarithmic negativity.
Broadening and intensity redistribution in the Na($3p$) hyperfine excitation spectra due to optical pumping in the weak excitation limit
Creators: name: Sydoryk, I.
name: Bezuglov, N. N.
name: Beterov, I. I.
name: Miculis, K.
name: Saks, E.
name: Janovs, A.
name: Spels, P.
name: Ekers, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Detailed analysis of spectral line broadening and variations in relative intensities of hyperfine spectral components due to optical pumping is presented. Hyperfine levels of sodium $3p_{1/2}$ and $3p_{3/2}$ levels are selectively excited in a supersonic beam at various laser intensities under the conditions when optical pumping time is shorter than transit time of atoms through the laser beam. The excitation spectra exhibit significant line broadening at laser intensities well below the saturation intensity, and redistribution of intensities of hyperfine spectral components is observed, which in some cases is contradicting with intuitive expectations. Theoretical analysis of the dynamics of optical pumping shows that spectral line broadening depends sensitively on branching coefficient of the laser-driven transition. Analytical expressions for branching ratio dependent critical Rabi frequency and critical laser intensity are derived, which give the threshold for onset of noticeable line broadening by optical pumping. Transitions with larger and smaller branching coefficients are relatively less affected. The theoretical excitation spectra were calculated numerically by solving density matrix equations of motion using the split propagation technique, and they well reproduce the observed effects of line broadening and peak intensity variations. The calculations also show that presence of dark (i.e., not laser- coupled) Zeeeman sublevels in the lower state results in effective branching coefficients which vary with laser intensity and differ from those implied by the sum rules, and this can lead to peculiar changes in peak ratios of hyperfine components of the spectra.
description: 12 pages, 10 figures
Examining the Factors Associated with Community Ambulation in an Older Adult Day Hospital Population
Creators: name: Conroy, Bronagh
Publisher: name: Royal College of Surgeons in Ireland
Year: 2021
Subjects: subject: 110308 Geriatrics and Gerontology
subject: FOS: Clinical medicine

description: Introduction: The ability of an older adult to walk independently outdoors in their community assists with maintaining independence, a healthy lifestyle and a good quality of life. In clinical practice, mobility is often one of the first activities where a decline is observed and where an older adult becomes dependent. The ability to walk outdoors is often a major goal for older adults attending a day hospital for rehabilitation. Aims and Objectives: The aim of this study was to examine the factors associated with community ambulation in community dwelling older adults attending a day hospital. Methods: A mixed methods study design was used. The main study, a cross sectional study used quantitative methods to assess community dwelling older adults attending a day hospital. The primary outcome measure was a community ambulation questionnaire. A range of other outcome measures were completed assessing motor, cognitive, executive function and behavioural domains. The qualitative substudy used Photovoice Methodology. Participants, all of whom had completed the main study, were provided with single use cameras. They had one week to take photographs of their perceived barriers and facilitators to community ambulation. These photographs formed the basis for focus group discussions. Focus groups were recorded, later transcribed and thematic analysis was used to identify key themes. Results: One hundred and sixty one participants completed the cross sectional study. The median age was 83 years old (IQR 9), female participants represented 64% of the study population and 49.1% of participants lived alone. Frailty (p<0.001), self-efficacy (p<0.001) and gait speed (p 0.03) were all independently associated with community ambulation in an older population attending a day hospital. Eight participants completed the Photovoice substudy and three themes were identified: personal, environmental and strategic factors, all associated with an older adults’ ability to ambulate in the community.Conclusion: This study demonstrated the complexity and multifactorial nature associated with independent community ambulation in older adults. This suggests that physiotherapists should adopt a broader approach to the assessment and treatment of older adults, to promote the achievement of independent community ambulation.
Trimaximal neutrino mixing from scotogenic $A_4$ family symmetry
Creators: name: Ding, Gui-Jun
name: Lu, Jun-Nan
name: Valle, Jose W. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a flavour theory of leptons implementing an $A_4$ family symmetry. Our scheme provides a simple way to derive trimaximal neutrino mixing from first principles, leading to simple and testable predictions for neutrino mixing and CP violation. Dark matter mediates neutrino mass generation, as in the simplest scotogenic model.
description: 16 pages, 5 figures
High field level crossing studies on spin dimers in the low dimensional quantum spin system Na$_2$T$_2$(C$_2$O$_4$)$_3$(H$_2$O)$_2$ with T=Ni,Co,Fe,Mn
Creators: name: Mennerich, C.
name: Klauss, H. -H.
name: Wolter, A. U. B.
name: Süllow, S.
name: Litterst, F. J.
name: Golze, C.
name: Klingeler, R.
name: Kataev, V.
name: B"uchner, B.
name: Goiran, M.
name: Rakoto, H.
name: Broto, J. -M.
name: Kataeva, O.
name: Price, D. J.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this paper we demonstrate the application of high magnetic fields to study the magnetic properties of low dimensional spin systems. We present a case study on the series of 2-leg spin-ladder compounds Na$_2$T$_2$(C$_2$O$_4$)$_3$(H$_2$O)$_2$ with T = Ni, Co, Fe and Mn. In all compounds the transition metal is in the $T^{2+}$ high spin configuation. The localized spin varies from S=1 to 3/2, 2 and 5/2 within this series. The magnetic properties were examined experimentally by magnetic susceptibility, pulsed high field magnetization and specific heat measurements. The data are analysed using a spin hamiltonian description. Although the transition metal ions form structurally a 2-leg ladder, an isolated dimer model consistently describes the observations very well. This behaviour can be understood in terms of the different coordination and superexchange angles of the oxalate ligands along the rungs and legs of the 2-leg spin ladder. All compounds exhibit magnetic field driven ground state changes which at very low temperatures lead to a multistep behaviour in the magnetization curves. In the Co and Fe compounds a strong axial anisotropy induced by the orbital magnetism leads to a nearly degenerate ground state and a strongly reduced critical field. We find a monotonous decrease of the intradimer magnetic exchange if the spin quantum number is increased.
Log supply valuation and allocation to alternative cutting programs using log boom scaling data
Creators: name: Smith, Robert Roy
Publisher: name: University of British Columbia
Year: 2009

description: Numerous methods have been developed by forest companies to ensure that the right logs are processed by the right facility into the right products. Advances in computer technology have made possible the detailed analysis of vast amounts of electronically recorded data, such as log scaling data, and the effective and accurate prediction of lumber recovery from sawlogs using sawing simulation. This thesis describes the development of a method for improving the utilization of merchantable grade log booms through the preliminary analysis of log scaling data and the use of bucking and sawing simulation to predict the lumber value recoverable from various sizes of sawlogs. Potential benefits include preliminary prediction of lumber production, valuation of log booms to improve selling and purchasing accuracy in open log markets, and improved profitability through the specific allocation of a log boom supply to alternative product lines. Based upon the results of a case study conducted on a Coastal British Columbia sawmill, the five step method can effectively predict the volumes and sizes of the lumber contained within a given log boom, as well as provide an estimate of the boom's dollar value. Overall profitability was also improved using a heuristic based allocation procedure on an entire month's log supply.
Valued fields with finitely many defect extensions of prime degree
Creators: name: Kuhlmann, Franz-Viktor
Publisher: name: arXiv
Year: 2021
Subjects: subject: Commutative Algebra (math.AC)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 12J10, 13A18

description: We prove that a valued field of positive characteristic $p$ that has only finitely many distinct Artin-Schreier extensions (which is a property of infinite NTP$_2$ fields) is dense in its perfect hull. As a consequence, it is a deeply ramified field and has $p$-divisible value group and perfect residue field. Further, we prove a partial analogue for valued fields of mixed characteristic and observe an open problem about 1-units in this setting. Finally, we fill a gap that occurred in a proof in an earlier paper in which we first introduced a classification of Artin-Schreier defect extensions.
Probabilistic teleportation of a quantum dot spin qubit
Creators: name: Kojima, Y.
name: Nakajima, T.
name: Noiri, A.
name: Yoneda, J.
name: Otsuka, T.
name: Takeda, K.
name: Li, S.
name: Bartlett, S. D.
name: Ludwig, A.
name: Wieck, A. D.
name: Tarucha, S.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Electron spin s in semiconductor quantum dot s have been intensively studied for implementing quantum computation and high fidelity single and two qubit operation s have recently been achieved . Quantum teleportation is a three qubit protocol exploiting quantum entanglement and it serv es as a n essential primitive for more sophisticated quantum algorithm s Here, we demonstrate a scheme for quantum teleportation based on direct Bell measurement for a single electron spin qubit in a triple quantum dot utilizing the Pauli exclusion principle to create and detect maximally entangled state s . T he single spin polarization is teleported from the input qubit to the output qubit with a fidelity of 0.9 1 We find this fidelity is primarily limited by singlet triplet mixing which can be improved by optimizing the device parameters Our results may be extended to quantum algorithms with a larger number of se miconductor spin qubit s
Time-resolved Fourier transform intracavity spectroscopy with a Cr2+:ZnSe laser
Creators: name: Picqué, Nathalie
name: Gueye, Fatou
name: Guelachvili, Guy
name: Sorokin, Evgeni
name: Sorokina, Irina T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Intracavity laser absorption spectroscopy (ICLAS) with an evacuated Cr2+: ZnSe laser is performed with a high-resolution time-resolved Fourier transform interferometer with a minimum detectable absorption coefficient equal to 4 10-9 cm-1 Hz-1/2 in the 2.5$μ$m region. This represents the extreme limit presently reached in the infrared by ICLAS with Doppler limited resolution. The broad gain band of the crystal allows a spectral coverage at most equal to 125 nm, wide enough to see entire vibration bands. Weak CO2 bands observed up to now only in the Venus atmosphere are recorded for the first time in a laboratory. H2O detection limit down to 0.9 ppbv is also demonstrated.