cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
z~7-10 Galaxies in the HUDF and GOODS fields, and their UV Luminosity Functions
Creators: name: Bouwens, Rychard J.
name: Illingworth, Garth D.
name: Franx, Marijn
name: Ford, Holland
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use all available deep optical ACS and near-IR data over both the HUDF and the two GOODS fields to search for star-forming galaxies at z>~7 and constrain the UV LF within the first 700 Myrs. Our data set includes ~23 arcmin^2 of deep NICMOS J+H data and ~248 arcmin^2 of ground-based (ISAAC+MOIRCS) data, coincident with ACS optical data of greater or equal depths. In total, we find 8 ~7.3 z-dropouts in our search fields, but no z~9 J-dropout candidates. A careful consideration of a wide variety of different contaminants suggest an overall contamination level of just ~12% for our z-dropout selection. After performing detailed simulations to accurately estimate the selection volumes, we derive constraints on the UV LFs at z~7 and z~9. For a faint-end slope alpha=-1.74, our most likely values for M*(UV) and phi* at z~7 are -19.8+/-0.4 mag and 1.1_{-0.7}^{+1.7} x 10^{-3} Mpc^{-3}, respectively. Our search results for z~9 J-dropouts set a 1 sigma lower limit on M*(UV) of -19.6 mag assuming that phi* and alpha are the same as their values at slightly later times. This lower limit on M*(UV) is 1.4 mag fainter than our best-fit value at z~4, suggesting that the UV LF has undergone substantial evolution over this time period. No evolution is ruled out at 99% confidence from z~7 to z~6 and at 80% confidence from z~9 to z~7. The inferred brightening in M*(UV) with redshift (i.e., M*(UV) = (-21.02+/-0.09) + (0.36+/-0.08)(z - 3.8)) matches the evolution expected in the halo mass function, if the mass-to-light ratio of halos evolves as ~(1+z)**{-1}. Finally, we consider the shape of the UV LF at z>~5 and discuss the implications of the Schechter-like form of the observed LFs, particularly the unexpected abrupt cut-off at the bright end.
description: 23 pages, 12 figures, accepted for publication in ApJ, updated to reflect accepted version
Building the Collaboration Graph of Open-Source Software Ecosystem
Creators: name: Lyulina, Elena
name: Jahanshahi, Mahmoud
Publisher: name: arXiv
Year: 2021
Subjects: subject: Software Engineering (cs.SE)
subject: Social and Information Networks (cs.SI)
subject: FOS: Computer and information sciences

description: The Open-Source Software community has become the center of attention for many researchers, who are investigating various aspects of collaboration in this extremely large ecosystem. Due to its size, it is difficult to grasp whether or not it has structure, and if so, what it may be. Our hackathon project aims to facilitate the understanding of the developer collaboration structure and relationships among projects based on the bi-graph of what projects developers contribute to by providing an interactive collaboration graph of this ecosystem, using the data obtained from World of Code infrastructure. Our attempts to visualize the entirety of projects and developers were stymied by the inability of the layout and visualization tools to process the exceedingly large scale of the full graph. We used WoC to filter the nodes (developers and projects) and edges (developer contributions to a project) to reduce the scale of the graph that made it amenable to an interactive visualization and published the resulting visualizations. We plan to apply hierarchical approaches to be able to incorporate the entire data in the interactive visualizations and also to evaluate the utility of such visualizations for several tasks.
description: 3 pages, 2 figures
Theoretical calculation of muon site in YBa₂Cu₃O
Creators: name: Li, Qiang
Publisher: name: University of British Columbia
Year: 2010

description: The muon is a useful probe of magnetic fields in superconductors, but knowing the field seen by the muon is often of limited value until we know where the muon is in the crystal lattice. In this thesis I employ two independent theoretical methods to search for candidate muon sites: the potential energy field method, which seeks the minimum of the electrostatic potential of the μ⁺, and the magnetic dipolar field method, which compares the calculated magnetic field (due to the host electronic, atomic or nuclear dipolar fields) with the observed local fields at the muon.
Largusoperla charliewattsi Sroka 2018
Creators: name: Chen, Zhi-Teng
name: Wang, Bo
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Largusoperla
Largusoperla charliewattsi

description: Largusoperla charliewattsi Sroka et al., 2018
 Largusoperla charliewattsi Sroka et al. 2018. PeerJ, 6 (e5354): 13. Specimen status: male holotype, SMNS BU-10 (SMNS).
 Remarks. Largusoperla charliewattsi can be distinguished from other congeners by the paraprocts strongly sclerotized, width subequal to length, apices hook-like and curved to each other (Fig. 1; Figs. 7D, 8B in Sroka et al. 2018).
description: Published as part of Chen, Zhi-Teng & Wang, Bo, 2019, Review of the fossil genus Largusoperla (Plecoptera: Perlidae): Annotated checklist, taxonomic identification, and description of a new species, pp. 281-291 in Zootaxa 4565 (2) on page 284, DOI: 10.11646/zootaxa.4565.2.12, http://zenodo.org/record/2589796
Optical second harmonic generation from Wannier excitons
Creators: name: Pedersen, Thomas G.
name: Cornean, Horia D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Excitonic effects in the linear optical response of semiconductors are well-known and the subject of countless experimental and theoretical studies. For the technologically important second order nonlinear response, however, description of excitonic effects has proved to be difficult. In this work, a simplified three-band Wannier exciton model of cubic semiconductors is applied and a closed form expression for the complex second harmonic response function including broadening is derived. Our calculated spectra are found to be in excellent agreement with the measured response near the band edge. In addition, a very substantial enhancement of the nonlinear response is predicted for the transparency region.
A Pilot Study For Fragment Identification Using 2D NMR and Deep Learning
Creators: name: Kuhn, Stefan
name: Tumer, Eda
name: Colreavy-Donnelly, Simon
name: Borges, Ricardo Moreira
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Biological sciences
subject: FOS: Computer and information sciences

description: This paper presents a method to identify substructures in NMR spectra of mixtures, specifically 2D spectra, using a bespoke image-based Convolutional Neural Network application. This is done using HSQC and HMBC spectra separately and in combination. The application can reliably detect substructures in pure compounds, using a simple network. It can work for mixtures when trained on pure compounds only. HMBC data and the combination of HMBC and HSQC show better results than HSQC alone.
description: 11 pages, 3 figures, 3 tables
A Concept for Polarized $^3$He Targets for High Luminosity Scattering Experiments in High Magnetic Field Environments
Creators: name: Maxwell, James
name: Milner, Richard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We present the conceptual design of a polarized $^3$He target to be used for high luminosity scattering experiments within high magnetic field environments. This two-cell target will take advantage of advancements in optical pumping techniques at high magnetic field to create 60% longitudinally polarized $^3$He gas in a pumping cell within a uniform magnetic field above 1 T. By transferring the polarized gas to cryogenic target cell, the gas density is increased to create a target thickness suitable for high luminosity applications. We discuss the general design of this scheme, and plans for its application in Jefferson Lab's CLAS12 detector.
description: arXiv admin note: substantial text overlap with arXiv:1911.06650
Study of $η'\toηπ^+π^-$ Dalitz plot
Creators: name: Dorofeev, V.
name: Dzheliadin, R.
name: Ekimov, A.
name: Fenyuk, A.
name: Gavrilov, Yu.
name: Gouz, Yu.
name: Ivashin, A.
name: Kabachenko, V.
name: Kachaev, I.
name: Karyukhin, A.
name: Khokhlov, Yu.
name: Konoplyannikov, A.
name: Konstantinov, V.
name: Makouski, M.
name: Matveev, V.
name: Nikolaenko, V.
name: Ostankov, A.
name: Polyakov, B.
name: Ryabchikov, D.
name: Shushkevich, S.
name: Solodkov, A. A.
name: Solodkov, A. V.
name: Solovianov, O.
name: Starchenko, E.
name: Zaitsev, A.
name: Zenin, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Dalitz plot of the $η' \to ηπ^+π^-$ decay is studied using the data collected with the VES spectrometer in two different exclusive reactions. The coefficients for the matrix element squared decomposition are measured on the largest statistics of $η'$ decays reported so far.
description: 9 pages, 4 figures, submitted to Physics Letters B
Largusoperla brianjonesi Sroka 2018
Creators: name: Chen, Zhi-Teng
name: Wang, Bo
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Largusoperla
Largusoperla brianjonesi

description: Largusoperla brianjonesi Sroka et al., 2018
 Largusoperla charliewattsi Sroka et al. 2018. PeerJ, 6 (e5354): 24. Specimen status: female holotype, SMNS BU- 311 (SMNS).
 Remarks. The holotype and only known specimen of L. brianjonesi is a female. This specimen is characterized by the posterior margin of subgenital plate with two broadly rounded lobes (Fig. 1; Figs. 15D, 16G in Sroka et al. 2018).
description: Published as part of Chen, Zhi-Teng & Wang, Bo, 2019, Review of the fossil genus Largusoperla (Plecoptera: Perlidae): Annotated checklist, taxonomic identification, and description of a new species, pp. 281-291 in Zootaxa 4565 (2) on page 284, DOI: 10.11646/zootaxa.4565.2.12, http://zenodo.org/record/2589796
Slip vs viscoelasticity in dewetting thin films
Creators: name: Blossey, Ralf
name: Muench, Andreas
name: Rauscher, Markus
name: Wagner, Barbara
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Other Condensed Matter (cond-mat.other)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Ultrathin polymer films on non-wettable substrates display dynamic features which have been attributed to either viscoelastic or slip effects. Here we show that in the weak and strong slip regime effects of viscoelastic relaxation are either absent or not distinguishable from slip effects. Strong-slip modifies the fastest unstable mode in a rupturing thin film, which questions the standard approach to reconstruct the effective interface potential from dewetting experiments.
description: 4 pages, submitted to Eur. Phys. J. E
Investigating Older Adults' Attitudes towards Crisis Informatics Tools: Opportunities for Enhancing Community Resilience during Disasters
Creators: name: Suhaimi, Nurul M
name: Zhang, Yixuan
name: Joseph, Mary
name: Kim, Miso
name: Parker, Andrea G
name: Griffin, Jacqueline
Publisher: name: arXiv
Year: 2022
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: The world population is projected to rapidly age over the next 30 years. Given the increasing digital technology adoption amongst older adults, researchers have investigated how technology can support aging populations. However, little work has examined how technology can support older adults during crises, despite increasingly common natural disasters, public health emergencies, and other crisis scenarios in which older adults are especially vulnerable. Addressing this gap, we conducted focus groups with older adults residing in coastal locations to examine to what extent they felt technology could support them during emergencies. Our findings characterize participants' desire for tools that enhance community resilience-local knowledge, preparedness, community relationships, and communication, that help communities withstand disasters. Further, older adults' crisis technology preferences were linked to their sense of control, social relationships, and digital readiness. We discuss how a focus on community resilience can yield crisis technologies that more effectively support older adults.
Largusoperla micktaylori Sroka 2018
Creators: name: Chen, Zhi-Teng
name: Wang, Bo
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Largusoperla
Largusoperla micktaylori

description: Largusoperla micktaylori Sroka et al., 2018
 Largusoperla micktaylori Sroka et al. 2018. PeerJ, 6 (e5354): 19. Specimen status: female holotype, SMNS BU- 227 (SMNS); female paratype, SMNS BU-312 (SMNS).
 Remarks. The holotype and only known specimen of L. micktaylori is also a female. This specimen is characterized by the posterior margin of subgenital plate with three long, narrow, apically pointed processes (Fig. 1; Fig. 11D in Sroka et al. 2018).
description: Published as part of Chen, Zhi-Teng & Wang, Bo, 2019, Review of the fossil genus Largusoperla (Plecoptera: Perlidae): Annotated checklist, taxonomic identification, and description of a new species, pp. 281-291 in Zootaxa 4565 (2) on page 285, DOI: 10.11646/zootaxa.4565.2.12, http://zenodo.org/record/2589796
Indeterminacy relations in random dynamics
Creators: name: Garbaczewski, Piotr
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Probability (math.PR)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We analyze various uncertainty measures for spatial diffusion processes. In this manifestly non-quantum setting, we focus on the existence issue of complementary pairs whose joint dispersion measure has strictly positive lower bound.
description: revised and expanded, 10 pages
Relinquishing Canada's nuclear roles
Creators: name: Erickson, Darrin Jerroll
Publisher: name: University of British Columbia
Year: 2010

description: This thesis is intended to enhance our knowledge of the processes behind the relinquishing of Canada's nuclear roles. As such, the underlying factors which helped bring about this change in Canadian defence policy are to be isolated and assessed. The process of retiring Canada's nuclear roles was long and complex, involving many actors and influences. The factors examined in this thesis are looked upon in the greater context of the 1960s and 1970s. The global and domestic political climates, the strategic environment and Canada's power within the global community as a whole during this time period, are considered. This study has revealed several interesting conclusions which one may draw concerning the relinquishing of Canada's nuclear roles. First of all, the Trudeau government's position on nuclear weapons coincided with growing opposition to nuclear weapons within the Canadian public. Furthermore, it is evident that public opinion on the nuclear issue was closely related to an individual's perception of the United States and his or her position on defence spending. Secondly, the process of retiring the nuclear weapon systems was led largely by Pierre Trudeau and some of his close associates, in particular Ivan Head and Donald MacDonald. This was done in the face of intense bureaucratic resistance. Thirdly, abandoning the nuclear roles was strongly related to Canada's declining position in the global community and also to the growth of detente. In addition, it was also partly the result of a rapidly changing strategic environemnt in which weapon systems were quickly made obsolete. Perhaps most importantly, this thesis shows that relinquishing Canada's nuclear roles was an extremely important part of the 1971 defence review. The issue of nuclear weapons is one which has been largely overlooked by defence and foreign policy analysts in the past, such as Thordarson as well as Granatstein and Bothwell, and therefore merits our attention. For this thesis, telephone interviews had to be conducted because very little written material is available to the public. Regrettably, these interviews must remain confidential for the time-being. Several books, articles and public opinion surveys also were very helpful in conducting this analysis.
Direct quantization of equations of motion: from classical dynamics to transition amplitudes via strings
Creators: name: Kochan, Denis
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: New method of quantization is presented. It is based on classical Newton-Lagrange equations of motion (representing the fundamental physical law of mechanics) rather than on their traditional Lagrangian and/or Hamiltonian precursors. It is shown that classical dynamics is governed by canonical two-form $Ω$, which embodies kinetic energy and forces acting within the system. New type of variational principle employing differential two-form $Ω$ and ''umbilical strings'' is introduced. The Feynman path integral over histories of the system is then rearranged to ''umbilical world-sheet'' functional integral in accordance with the proposed variational principle. In the case of potential-generated forces, world-sheet approach reduces to the standard quantum mechanics. As an example Quantum Mechanics with friction is analyzed in detail.
description: 16 pages, 5 figures, comments are welcome, author is looking for postdoctoral position
Nonlinear Period-Luminosity Relation for the Large Magellanic Cloud Cepheids: Myths and Truths
Creators: name: Ngeow, C.
name: Kanbur, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this paper, we discuss and examine various issues concerning the recent findings that suggested the observed period-luminosity (P-L) relation for the Large Magellanic Cloud (LMC) Cepheids is nonlinear. These include (1) visualizing the nonlinear P-L relation; (2) long period Cepheids and sample selection; (3) outlier removal; (4) issues of extinction; (5) nonlinearity of the period-color (P-C) relation; (6) nonlinear P-L relations in different pass-bands; and (7) universality of the P-L relation. Our results imply that a statistical test is needed to detect the nonlinear PL relation. We then show that sample selection, number of long period Cepheids in the sample, outlier removal and extinction errors are unlikely to be responsible for the detection of the nonlinear P-L relation. We also argue for the existence of a nonlinear P-L relation from the perspective of the nonlinear P-C relation and the non-universality of the P-L relation. Combining the evidence and discussion from these aspects, we find that there is a strong indication that the observed LMC P-L relation is indeed nonlinear in the optical bands (however the K-band LMC P-L relation is apparently linear). This could be due to the internal physical reasons or the external hidden/additional factors. Compared to the non-linear P-L relation, the systematic error in distance scale introduced from using the (incorrect) linear P-L relation is at most at a few per cent level. While this is small compared to other systematic errors, it will be important in future efforts to produce a Cepheid distance scale accurate to one per cent in order to remove degeneracies presented in CMB results.
description: 22 pages, 8 figures, 1 table, ApJ accepted
A Transient Black-Hole Low-Mass X-Ray Binary Candidate in Centaurus A
Creators: name: Sivakoff, Gregory R.
name: Kraft, Ralph P.
name: Jordán, Andrés
name: Juett, Adrienne M.
name: Evans, Daniel A.
name: Forman, William R.
name: Hardcastle, Martin J.
name: Sarazin, Craig L.
name: Birkinshaw, Mark
name: Brassington, Nicola J.
name: Croston, Judith H.
name: Harris, William E.
name: Jones, Christine
name: Murray, Stephen S.
name: Raychaudhury, Somak
name: Woodley, Kristin A.
name: Worrall, Diana M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report the discovery of a bright transient X-ray source, CXOU J132518.2-430304, towards Centaurus A (Cen A) using six new Chandra X-Ray Observatory observations in 2007 March--May. Between 2003 and 2007, its flux has increased by a factor of >770. The source is likely a low-mass X-ray binary in Cen A with unabsorbed 0.3-10 keV band luminosities of (2-3) x 10^{39} erg s^-1 and a transition from the steep-power law state to the thermal state during our observations. CXOU J132518.2-430304 is the most luminous X-ray source in an early-type galaxy with extensive timing information that reveals transience and a spectral state transition. Combined with its luminosity, these properties make this source one of the strongest candidates to date for containing a stellar-mass black hole in an early-type galaxy. Unless this outburst lasts many years, the rate of luminous transients in Cen A is anomalously high compared to other early-type galaxies.
description: Corrected Minor Typo in Figure. Accepted by Astrophysical Journal Letters, 4 pages, 1 Color Figures, 2 B & W Figures (1 degraded): Full resolution paper available at http://www.astronomy.ohio-state.edu/~sivakoff/CenA/CenA_Transient_BH_LMXB.pdf
Towards Noncommutative Quantum Reality
Creators: name: Kong, Otto C. W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The implications of the physical theory of quantum mechanics on the question of realism is much a subject of sustaining interest, while the background questions among physicists on how to think about all the theoretical notion and `interpretation' of the theory remains controversial. Through a careful analysis of the theoretical notions with the help of modern mathematical perspectives, we give here a picture of quantum mechanics, as the basic theory for `nonrelativistic' particle dynamics, that can be seen as being as much about the physical reality as classical mechanics itself. The key is to fully embrace the noncommutativity of the theory and see it as a notion about the reality of physical quantities. Quantum reality is then just a noncommutative version of the classical reality.
description: 32 pages of latex, no figure, proofread version to be published
Larkin-Ovchinnikov state in resonant Fermi gas
Creators: name: Yoshida, Nobukatsu
name: Yip, S. -K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We construct the phase diagram of a homogeneous two component Fermi gas with population imbalance under a Feshbach resonance. In particular, we study the physics and stability of the Larkin-Ovchinnikov phase. We show that this phase is stable over a much larger parameter range than what has been previously reported by other authors.
description: Typos corrected
Oscillations in the stable starless core Barnard 68
Creators: name: Redman, M. P.
name: Keto, E.
name: Rawlings, J. M. C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: New molecular line observations of the Bok globule Barnard 68 in HCO+ irrefutably confirm the complex pattern of red and blue asymmetric line profiles seen across the face of the cloud in previous observations of CS. The new observations thus strengthen the previous interpretation that Barnard 68 is undergoing peculiar oscillations. Furthermore, the physical chemistry of B68 indicates that the object is much older than the sound crossing time and is therefore long-lived. A model is presented for the globule in which a modest external pressure perturbation is shown to lead to oscillations about a stable equilibrium configuration. Such oscillations may be present in other stable starless cores as manifested by a similar signature of inward and outward motions.
description: Accepted for MNRAS letters, 5 pages, 7 figures
Largusoperla
Creators: name: Chen, Zhi-Teng
name: Wang, Bo
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Largusoperla

description: Largusoperla sp. Sroka et al., 2018
 Largusoperla sp. Sroka et al. 2018. PeerJ, 6 (e5354): 27. Specimen status: male holotype, SMNS BU-228 (SMNS). Remarks. The specimen of L. sp. is not well preserved, without the hammer and paraprocts visible to allow a detailed comparison with other described taxa (Sroka et al. 2018)., This species is not included in the following key.
description: Published as part of Chen, Zhi-Teng & Wang, Bo, 2019, Review of the fossil genus Largusoperla (Plecoptera: Perlidae): Annotated checklist, taxonomic identification, and description of a new species, pp. 281-291 in Zootaxa 4565 (2) on page 285, DOI: 10.11646/zootaxa.4565.2.12, http://zenodo.org/record/2589796
Tuning the electronic band structure of metal surfaces for enhancing high-order harmonic generation
Creators: name: Agueny, Hicham
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optics (physics.optics)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: High harmonic generation (HHG) from condensed matter phase holds promise to promote future cutting-edge research in the emerging field of attosecond nanoscopy. The key for the progress of the field relies on the capability of the existing schemes to enhance the harmonic yield and to push the photon energy cutoff to the extreme ultraviolet (XUV, 10-100 eV) regime and beyond towards the spectral "water window" region (282-533 eV). Here, we demonstrate a coherent control scheme of HHG, which we show to give rise to quantum modulations in the XUV region. The control scheme is based on exploring surface states in transition-metal surfaces, and specifically by tuning the electronic structure of the metal surface itself together with the use of optimal chirped pulses. Moreover, we show that the use of such pulses having moderate intensities permits to push the harmonic cutoff further to the spectral water window region, and that the extension is found to be robust against the change of the intrinsic properties of the material. The scenario is numerically implemented using a minimal model by solving the time-dependent Schrodinger equation for the metal surface Cu(111) initially prepared in the surface state. Our findings elucidate the importance of metal surfaces for generating coherent isolated attosecond XUV and soft-x-ray pulses and for designing compact solid-state HHG devices.
description: 9 pages, 4 figures
Yang-Baxter algebra and generation of quantum integrable models
Creators: name: Kundu, Anjan
Publisher: name: arXiv
Year: 2006
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: An operator deformed quantum algebra is discovered exploiting the quantum Yang-Baxter equation with trigonometric R-matrix. This novel Hopf algebra along with its $q \to 1$ limit appear to be the most general Yang-Baxter algebra underlying quantum integrable systems. Three different directions of application of this algebra in integrable systems depending on different sets of values of deforming operators are identified. Fixed values on the whole lattice yield subalgebras linked to standard quantum integrable models, while the associated Lax operators generate and classify them in an unified way. Variable values construct a new series of quantum integrable inhomogeneous models. Fixed but different values at different lattice sites can produce a novel class of integrable hybrid models including integrable matter-radiation models and quantum field models with defects, in particular, a new quantum integrable sine-Gordon model with defect.
description: 13 pages, revised and bit expanded with additional explanations, accepted for publication in Theor. Math. Phys
An ethnographic study of home schooling
Creators: name: Gilgoff, Betty L.
Publisher: name: University of British Columbia
Year: 2010

description: The study is an ethnographic study of home schooling in the lower mainland of British Columbia. It was conducted to increase understanding of the growing home schooling movement in the province. The information gained is valuable in assessing recent legislative changes in the new British Columbia School Act (1989) and the resulting policy changes with regard to home schooling. The purpose of the study was primarily exploratory. The design was based on two propositions: (1) that it may be possible to build characterizations of home schooling families and, (2) that these characterizations, or portraits, may include certain reactions to the policy changes. To examine these propositions the study focused on the following four main questions: 1. Why are some families in urban areas in British Columbia choosing to home school their children? 2. What does home schooling mean to these families? 3. How are these home schooling families reacting to the new legislation on home schooling? 4. What alternatives, if any, would the home schoolers prefer? The analysis of the study presents the finding from two different perspectives. It first provides three portraits based on stories of "committed home schoolers", those who have reached a level of certainty and comfort with home schooling as an alternative to a school system. From the characterizations developed three ideal styles are determined and diagramed. A second perspective examines the stories of "situational home schoolers", those who have moved into home schooling because of dissatisfaction with the public school system. The conclusion of the research uses the division of home schoolers into committed and situational groups to examine recent legislative and policy changes relevant to home schooling. Although the research is limited in its design as it is based on replication logic rather than sampling logic, it has developed theories about patterns which may exist amongst home schoolers. These theories strongly suggest that government policies with regard to home schooling need to be developed with an understanding of the individualistic nature of each home schooling situation.
Average Rate Analysis of RIS-aided Short Packet Communication in URLLC Systems
Creators: name: Hashemi, Ramin
name: Ali, Samad
name: Mahmood, Nurul Huda
name: Latva-aho, Matti
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Theory (cs.IT)
subject: Signal Processing (eess.SP)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: In this paper, the average achievable rate of a re-configurable intelligent surface (RIS) aided factory automation is investigated in finite blocklength (FBL) regime. First, the composite channel containing the direct path plus the product of reflected paths through the RIS is characterized. Then, the distribution of the received signal-to-noise ratio (SNR) is matched to a Gamma random variable whose parameters depend on the total number of RIS elements as well as the channel pathloss. Next, by assuming FBL model, the achievable rate expression is identified and the corresponding average rate is elaborated based on the proposed SNR distribution. The phase error due to quantizing the phase shifts is considered in the simulation. The numerical results show that Monte Carlo simulations conform to the matched Gamma distribution for the received SNR for large number of RIS elements. In addition, the system reliability indicated by the tightness of the SNR distribution increases when RIS is leveraged particularly when only the reflected channel exists. This highlights the advantages of RIS-aided communications for ultra-reliable low-latency communications (URLLC) systems. The reduction of average achievable rate due to working in FBL regime with respect to Shannon capacity is also investigated as a function of total RIS elements.
description: Accepted in ICC 2021 Workshop on Reconfigurable Intelligent Surfaces for Future Wireless Communications. arXiv admin note: substantial text overlap with arXiv:2102.13363
Additional file 1 of CD24+LCN2+ liver progenitor cells in ductular reaction contributed to macrophage inflammatory responses in chronic liver injury
Creators: name: Huang, Wei-Jian
name: Qiu, Bi-Jun
name: Qi, Xiao-Shu
name: Chen, Cai-Yang
name: Liu, Wen-Ming
name: Zhou, Shen-ao
name: Ding, Min
name: Lu, Feng-Feng
name: Zhao, Jie
name: Tang, Dan
name: Zhou, Xu
name: Fu, Gong-Bo
name: Wang, Zhen-Yu
name: Ma, Hong-Qian
name: Wu, Yu-Ling
name: Wu, Hong-ping
name: Chen, Xiao-Song
name: Yu, Wei-Feng
name: Yan, He-Xin
Publisher: name: figshare
Year: 2023
Subjects: subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: Physiology
subject: Chemical Sciences not elsewhere classified
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer

description: Additional file 1. Additional methods, figures and tables.
Sensitivity Parameter and Time Variations of Fundamental Constants
Creators: name: Yan, Su
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The sensitivity parameter is widely used for quantifying fine tuning. However, examples show it fails to give correct results under certain circumstances. We argue that the problems of the sensitivity parameter are almost identical to the consequences we have to solved if the time-varying fine structure constant is proved to be true. The high sensitivity of the energy scale parameter (Λ) to the dimensionless coupling constant plays an important role in these problems. It affects the reliability of the sensitivity parameter via mechanisms such as dynamical symmetry breaking, chiral symmetry breaking etc. The reliability of the sensitivity parameter can be improved if it is used properly.
description: 6 pages
Theory and simulation of AC electroosmotic suppression of acoustic streaming
Creators: name: Winckelmann, Bjørn G.
name: Bruus, Henrik
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Acoustic handling of nanoparticles in resonating acoustofluidic devices is often impeded by the presence of acoustic streaming. For micrometer-sized acoustic chambers, this acoustic streaming is typically driven from the fluid-solid interface by viscous shear-stresses generated by the acoustic actuation. AC electroosmosis is another boundary-driven streaming phenomena routinely used in microfluidic devices for handling of particle suspensions in electrolytes. Here, we study how streaming can be suppressed by combining ultrasound acoustics and AC electroosmosis. Based on a theoretical analysis of the electrokinetic problem, we are able to compute numerically a form of the electrical potential at the fluid-solid interface, which is suitable for suppressing a typical acoustic streaming pattern associated with a standing acoustic half-wave. In the linear regime, we even derive an analytical expression for the electroosmotic slip velocity at the fluid-solid interface, and use this as a guiding principle for developing models in the experimentally more relevant nonlinear regime that occurs at elevated driving voltages. We present simulation results for an acoustofluidic device, showing how implementing a suitable AC electroosmosis results in a suppression of the resulting streaming in the bulk of the device by two orders of magnitude.
description: 12 pages, 8 pdf figures, compiled using JASAnew.cls
Broadband single-mode planar waveguides in monolithic 4H-SiC
Creators: name: Bosma, Tom
name: Hendriks, Joop
name: Ghezellou, Misagh
name: Son, Nguyen T.
name: Ul-Hassan, Jawad
name: van der Wal, Caspar H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Applied Physics (physics.app-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Color-center defects in silicon carbide promise opto-electronic quantum applications in several fields, such as computing, sensing and communication. In order to scale down and combine these functionalities with the existing silicon device platforms, it is crucial to consider SiC integrated optics. In recent years many examples of SiC photonic platforms have been shown, like photonic crystal cavities, film-on-insulator waveguides and micro-ring resonators. However, all these examples rely on separating thin films of SiC from substrate wafers. This introduces significant surface roughness, strain and defects in the material, which greatly affects the homogeneity of the optical properties of color centers. Here we present and test a method for fabricating monolithic single-crystal integrated-photonic devices in SiC: tuning optical properties via charge carrier concentration. We fabricated monolithic SiC n-i-n and p-i-n junctions where the intrinsic layer acts as waveguide core, and demonstrate the waveguide functionality for these samples. The propagation losses are below 14 dB/cm. These waveguide types allow for addressing color-centers over a broad wavelength range with low strain-induced inhomogeneity of the optical-transition frequencies. Furthermore, we expect that our findings open the road to fabricating waveguides and devices based on p-i-n junctions, which will allow for integrated electrostatic and radio frequency (RF) control together with high-intensity optical control of defects in silicon carbide.
description: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics 131, 025703 (2022) and may be found at https://aip.scitation.org/doi/10.1063/5.0077164
On the transition of the adiabatic supernova remnant to the radiative stage in a nonuniform interstellar medium
Creators: name: Petruk, O.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Methods for estimation of different reference times which appear in the description of transition of a strong adiabatic shock into the radiative era are reviewed. The need for consideration of an additional transition subphase in between the end of the adiabatic era and the beginning of the radiative ''pressure-driven snowplow'' stage for a shock running in the uniform or nonuniform medium is emphasized. This could be of importance in particular for studying the interaction of supernova remnants (SNRs) with molecular clouds and therefore for understanding the processes of the cosmic ray production in such systems. The duration of this subphase - about 70% of SNR age at its beginning - is almost independent of the density gradient for media with increasing density and is longer for higher supernova explosion energy and for smaller density in the place of explosion. It is shown as well that if the density of the ambient medium decreases then the cooling processes could differ from the commonly accepted scenario of the ''thin dense radiative shell'' formation. This property should be studied in the future because it is important for models of nonspherical SNRs which could be only partially radiative.
description: 12 pages, 5 figures
TU intern: die Hochschulzeitung der Technischen Universität Berlin
Creators: name: (:Unkn) Unknown
Publisher: name: Technische Universität Berlin
Year: 2019
Subjects: subject: 000 Informatik, Informationswissenschaft, allgemeine Werke
subject: Hochschulzeitung
subject: Technische Universität
subject: TU Berlin

description: Die Hochschulzeitung "TU intern" berichtet sowohl über Aktuelles aus der Universität als auch über landes- und bundesweite Themen. Sie wendet sich an Mitglieder und Alumni der Universität sowie an Politik, Wirtschaft und Medien. Für die Berlin University Alliance, dem in der Exzellenzstrategie gekürten Verbund der Berliner Universität und der Charité, beginnt nach dem Feiern jetzt eine Zeit harter Arbeit. TU-Präsident Christian Thomsen gibt Einblick in die Arbeits- und Lenkungskreise, die sich gebildet haben, um nun konkrete Konzepte für den gemeinsamen Aufbau von Lehr-, Forschungs- und Berufungsprozessen sowie Ressourcen- und Infrastrukturnutzung zu erarbeiten. Dabei gilt: Soviel Wettbewerb wie nötig, so viel Kooperation wie möglich. Das ist Neuland. Der bevorstehende Brexit stellt auch Briten in Berlin, die „Brexpats“ vor ganz neue Herausforderungen. Und ebenfalls Neuland für Mensch, Stadt und Natur eröffnete der Mauerfall in Berlin vor 30 Jahren. Doch er hinterließ Spuren, die bis heute sichtbar sind. Mit autonom fahrenden Autos, Plastikproduktion aus Abfallfetten, der Auswertung kosmischer Strahlung zur Prognose von Hitze, Dürre und Sturzfluten oder der erstmaligen Herstellung komplizierter medizinischer Modelle nach menschlichem Vorbild betritt auch die Forschung Neuland. Gleichzeitig will der Kanzler der TU Berlin neue Möglichkeiten erkunden, die TU Berlin als Arbeitgeberin attraktiver zu machen und gemeinsam mit der Uni-Verwaltung den Wandel zu meistern. Dies und viele weitere Themen aus Wissenschaft und Lehre der im spannenden Umfeld wachsenden Organisation TU Berlin lesen Sie in der neuen "TU intern".
High-resolution simulations of clump-clump collisions using SPH with Particle Splitting
Creators: name: Kitsionas, S.
name: Whitworth, A. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate, by means of numerical simulations, the phenomenology of star formation triggered by low-velocity collisions between low-mass molecular clumps. The simulations are performed using an SPH code which satisfies the Jeans condition by invoking On-the-Fly Particle Splitting. Clumps are modelled as stable truncated (non-singular) isothermal, i.e. Bonnor-Ebert, spheres. Collisions are characterised by M_0 (clump mass), b (offset parameter, i.e. ratio of impact parameter to clump radius), and M (Mach Number, i.e. ratio of collision velocity to effective post-shock sound speed). The gas subscribes to a barotropic equation of state, which is intended to capture (i) the scaling of pre-collision internal velocity dispersion with clump mass, (ii) post-shock radiative cooling, and (iii) adiabatic heating in optically thick protostellar fragments. The efficiency of star formation is found to vary between 10% and 30% in the different collisions studied and it appears to increase with decreasing M_0, and/or decreasing b, and/or increasing M. For b<0.5 collisions produce shock compressed layers which fragment into filaments. Protostellar objects then condense out of the filaments and accrete from them. The resulting accretion rates are high, 1 to 5 x 10^{-5} M_sun yr^{-1}, for the first 1 to 3 x 10^4 yrs. The densities in the filaments, n >~ 5 x 10^5 cm^{-3}, are sufficient that they could be mapped in NH_3 or CS line radiation, in nearby star formation regions.
description: Accepted for publication in MNRAS; 21 pages; 25 figures. Four figures are provided separately in reduced jpg format due to their large original ps size: click on "PostScript" to have direct access to the 4 jpg figures; full size ps files for these 4 figures can be found at http://www.aip.de/People/skitsionas/papers/
Generalizing Birkhoff
Creators: name: Weiner, Joel L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 83-xx

description: We generalize Birkhoff's Theorem in the following fashion. We find necessary and sufficient conditions for any spherically symmetric space-time to be static in terms of the eigenvalues of the stress-energy tensor. In particular, we generalize the Tolman-Oppenheimer-Volkoff equation and prove that Birkhoff's theorem holds under the weaker hypothesis of no pressure (with respect to an appropriate frame.) We provide equations that show how the coefficients of the metric relate to the eigenvalues of the stress-energy tensor. These involve integrals that are simple functions of those eigenvalues. We also determine among all static spherically symmetric space-times those that are asymptotically flat. A few examples are presented taking advantage of the results. The calculations are done by viewing the space-times as warped products and the computations are done using Cartan's moving frames approach.
description: 21 pages
TU intern: die Hochschulzeitung der Technischen Universität Berlin
Creators: name: (:Unkn) Unknown
Publisher: name: Technische Universität Berlin
Year: 2019
Subjects: subject: 000 Informatik, Informationswissenschaft, allgemeine Werke
subject: Hochschulzeitung
subject: Technische Universität
subject: TU Berlin

description: Die Hochschulzeitung "TU intern" berichtet sowohl über Aktuelles aus der Universität als auch über landes- und bundesweite Themen. Sie wendet sich an Mitglieder und Alumni der Universität sowie an Politik, Wirtschaft und Medien. Mit Spannung erwartet in ganz Berlin: Der Startschuss für die Millionenförderung aus der Exzellenzstrategie. Lesen Sie, was in der Auftaktveranstaltung zur übergreifenden Grand Challenge „Social Cohesion“ zum sozialen Zusammenhalt der Gesellschaft diskutiert wurde und erfahren Sie mehr über die ersten Projekte der TU Berlin im Verbund. Auch die TU-Citizen-Science-Projekte, in denen Bürger*innen zu Wissenschaftler*innen werden, nehmen Fahrt auf: Hier geht es um „Besser schmecken“, die Revolution der Pilze oder das Messen von Schadstoffen. In weiteren Forschungsgeschichten geht es um Gräueltaten der Nationalsozialisten im Nordkaukasus, um städtische Sturzfluten im Sommer oder die Melodie des Genoms. Das Campusmanagementsystem mit der SAP-Software startet in vielen Uni-Bereichen, der älteste deutsche Universitätsverlag schaut in die digitale Zukunft, wir blicken ins das neue Analyselabor von Juri Rappsilber, Alumni berichten von ihren Start up-Erfahrungen und – last not least – bietet „TU intern“ Tipps für „Bücher für den Gabentisch“.