cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ultrafast Electron Dynamics in the Topological Insulator Bi2Se3 Studied by Time-Resolved Photoemission Spectroscopy
Creators: name: Sobota, Jonathan A.
name: Yang, Shuolong
name: Leuenberger, Dominik
name: Kemper, Alexander F.
name: Analytis, James G.
name: Fisher, Ian R.
name: Kirchmann, Patrick S.
name: Devereaux, Thomas P.
name: Shen, Zhi-Xun
Publisher: name: arXiv
Year: 2014
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We characterize the topological insulator Bi$_2$Se$_3$ using time- and angle- resolved photoemission spectroscopy. By employing two-photon photoemission, a complete picture of the unoccupied electronic structure from the Fermi level up to the vacuum level is obtained. We demonstrate that the unoccupied states host a second, Dirac surface state which can be resonantly excited by 1.5 eV photons. We then study the ultrafast relaxation processes following optical excitation. We find that they culminate in a persistent non-equilibrium population of the first Dirac surface state, which is maintained by a meta-stable population of the bulk conduction band. Finally, we perform a temperature-dependent study of the electron-phonon scattering processes in the conduction band, and find the unexpected result that their rates decrease with increasing sample temperature. We develop a model of phonon emission and absorption from a population of electrons, and show that this counter-intuitive trend is the natural consequence of fundamental electron-phonon scattering processes. This analysis serves as an important reminder that the decay rates extracted by time-resolved photoemission are not in general equal to single electron scattering rates, but include contributions from filling and emptying processes from a continuum of states.
description: In Press: Journal of Electron Spectroscopy & Related Phenomena (special issue on 2-photon photoemission spectroscopy)
Aspects of Axions and ALPs Phenomenology
Creators: name: Giannotti, Maurizio
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The physics of axions and axion-like particles (ALPs) is enjoying an incredibly productive period, with many new experimental proposals, theoretical idea, and original astrophysical and cosmological arguments which help the search effort. The large number of experimental proposals is likely to lead to fundamental advances (perhaps, a discovery?) in the coming years. The aim of this article is to provide a very brief overview of some of the recent developments in axions and ALP phenomenology, and to discuss some relevant aspects in this important field. A particular attention is given to the definition of motivated regions in the axion parameters space, which should be the targets of experimental searches.
description: Contribution to the 10th international symposium on Large TPCs for low-energy rare event detection
title: Sarastro; [1848]
title: In diesen heiligen Hallen Kennt man keine Amestie etc.
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform des Erschienugsvermerks: Verlag v. W. Müller in Frankfurt a/m.
Effective electrostatic interactions in mixtures of charged colloids
Creators: name: Chung, Jun Kyung
name: Denton, Alan R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present a theory of effective electrostatic interactions in polydisperse suspensions of charged macroions, generalizing to mixtures a theory previously developed for monodisperse suspensions. Combining linear response theory with a random phase approximation for microion correlations, we coarse-grain the microion degrees of freedom to derive general expressions for effective macroion-macroion pair potentials and a one-body volume energy. For model mixtures of charged hard-sphere colloids, we give explicit analytical expressions. The resulting effective pair potentials have the same general form as predicted by linearized Poisson-Boltzmann theory, but consistently incorporate dependence on macroion density and excluded volume via the Debye screening constant. The volume energy, which depends on the average macroion density, contributes to the free energy and so can influence thermodynamic properties of deionized suspensions. To validate the theory, we compute radial distribution functions of binary mixtures of oppositely charged colloidal macroions from molecular dynamics simulations of the coarse-grained model (with implicit microions), taking effective pair potentials as input. Our results agree closely with corresponding results from more computationally intensive Monte Carlo simulations of the primitive model (with explicit microions). Simulations of a mixture with large size and charge asymmetries indicate that charged nanoparticles can enhance electrostatic screening of charged colloids. The theory presented here lays a foundation for future large-scale modeling of complex mixtures of charged colloids, nanoparticles, and polyelectrolytes.
description: 11 pages, 5 figures
The Art of Development: Images Promoting Dialogue and Alternatives to Poverty and Violence in Local Communities of Colombia
Creators: name: Rojas, Natali
Publisher: name: Columbia University
Year: 2011
Subjects: Arts and the poor
Arts in education
Community arts projects
Cinematography
Art--Study and teaching
Social structure

description: Sueños Films Colombia is a grassroots organization based in Ciudad Bolivar, southern Bogotá-Colombia. For over ten years, this community-based project has offered diverse art activities including audiovisual training, documentary production workshops, forums on cinema and an international film festival. This innovative community organization promotes the active participation of local people, enabling them to use the arts to express themselves, to interact with others and to find collective solutions for their community.
‘The Art of Development’ collects material from the time that I have spent in Ciudad Bolivar and other marginalized barrios/neighborhoods of Bogotá and Manizales. Since May 2010, I have been assisting several projects that Sueños Films Colombia has organized, including filmmaking seminars and workshops, while producing ethnographic material for my Masters thesis.
Through the following images, I hope to share the power of the arts in promoting alternatives to poverty and violence, along with, even more importantly, the strength of the local Colombian people. I have been inspired by children taking their first photos, elderly learning video editing from their grandsons or neighbors, and the energy moving groups of people from different generations to develop projects collectively.
Review on dark matter searches
Creators: name: Cebrián, Susana
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Dark matter particles populating our galactic halo could be directly detected by measuring their scattering off target nuclei or electrons in a suitable detector. As this interaction is expected to occur with very low probability and would generate very small energy deposits, the detection is challenging; the possible identification of distinctive signatures (like an annual modulation in the interaction rates or directionality) to assign a dark matter origin to a possible observation is being considered. Here, the physics case of different dark matter direct detection experiments will be presented and the different and complementary techniques which are being applied or considered will be discussed, summarizing their features and latest results obtained. Special focus will be made on TPC-related projects; experiments using noble liquids have presently a leading role to constrain interaction cross sections of a wide range of dark matter candidates and gaseous detectors are very promising to explore specifically low mass dark matter as well as to measure directionality.
description: Proceedings of 10th Symposium on Large TPCs for low-energy rare event detection, to appear in Jounal of Physics (Conference Series). arXiv admin note: text overlap with arXiv:1910.13947, arXiv:2102.12143
On giant components and treewidth in the layers model
Creators: name: Feige, Uriel
name: Hermon, Jonathan
name: Reichman, Daniel
Publisher: name: arXiv
Year: 2014
Subjects: subject: Discrete Mathematics (cs.DM)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: Given an undirected $n$-vertex graph $G(V,E)$ and an integer $k$, let $T_k(G)$ denote the random vertex induced subgraph of $G$ generated by ordering $V$ according to a random permutation $π$ and including in $T_k(G)$ those vertices with at most $k-1$ of their neighbors preceding them in this order. The distribution of subgraphs sampled in this manner is called the \emph{layers model with parameter} $k$. The layers model has found applications in studying $\ell$-degenerate subgraphs, the design of algorithms for the maximum independent set problem, and in bootstrap percolation. In the current work we expand the study of structural properties of the layers model. We prove that there are $3$-regular graphs $G$ for which with high probability $T_3(G)$ has a connected component of size $Ω(n)$. Moreover, this connected component has treewidth $Ω(n)$. This lower bound on the treewidth extends to many other random graph models. In contrast, $T_2(G)$ is known to be a forest (hence of treewidth~1), and we establish that if $G$ is of bounded degree then with high probability the largest connected component in $T_2(G)$ is of size $O(\log n)$. We also consider the infinite two-dimensional grid, for which we prove that the first four layers contain a unique infinite connected component with probability $1$.
Heavy dust obscuration of z=7 galaxies in a cosmological hydrodynamic simulation
Creators: name: Kimm, Taysun
name: Cen, Renyue
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Hubble Space Telescope observations with Wide Field Camera 3/IR reveal that galaxies at z~7 have very blue ultraviolet (UV) colors, consistent with these systems being dominated by young stellar populations with moderate or little attenuation by dust. We investigate UV and optical properties of the high-z galaxies in the standard cold dark matter model using a high-resolution adaptive mesh refinement cosmological hydrodynamic simulation. For this purpose, we perform panchromatic three-dimensional dust radiative transfer calculations on 198 galaxies of stellar mass 5x10^8-3x10^{10} Msun with three parameters, the dust-to-metal ratio, the extinction curve, and the fraction of directly escaped light from stars (\fesc). Our stellar mass function is found to be in broad agreement with Gonzalez et al., independent of these parameters. We find that our heavily dust-attenuated galaxies (A_V~1.8) can also reasonably match modest UV-optical colors, blue UV slopes, as well as UV luminosity functions, provided that a significant fraction (~10%) of light directly escapes from them. The observed UV slope and scatter are better explained with an Small Magellanic Cloud-type extinction curve, whereas Milky Way-type dust predicts too blue UV colors due to the 2175A bump. We expect that upcoming observations by ALMA will be able to test this heavily obscured model.
description: 6 pages, 3 figures, accepted for publication in ApJ
Time delay in the quadrupole field of a body at rest in 2PN approximation
Creators: name: Zschocke, Sven
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The time delay of a light signal in the quadrupole field of a body at rest is determined in the second post-Newtonian (2PN) approximation in harmonic coordinates. For grazing light rays at Sun, Jupiter, and Saturn the 2PN quadrupole effect in time delay amounts up to 0.004, 0.14, and 0.04 pico-second, respectively. These values are compared with the time delay in the first post-Newtonian (1PN and 1.5PN) approximation, where it turns out that only the first eight mass-multipoles and the spin-dipole of these massive bodies are required for a given goal accuracy of 0.001 pico-second in time-delay measurements in the solar system. In addition, the spin-hexapole of Jupiter is required on that scale of accuracy.
description: 34 pages, 1 figure
Letter from Barbara Hepworth to Herbert Read, August 31, 1967
Creators: name: Hepworth, Barbara, 1903-1975
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Hepworth, Barbara, 1903-1975
valueUri: http://id.worldcat.org/fast/1898202
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Art historians
valueUri: http://id.worldcat.org/fast/815554
subject: Artists--Correspondence
valueUri: http://id.worldcat.org/fast/817571
subject: Women artists
valueUri: http://id.worldcat.org/fast/1177159
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Artists
valueUri: http://id.worldcat.org/fast/817559
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Authors, English--Correspondence
valueUri: http://id.worldcat.org/fast/821953
subject: Read, Herbert, 1893-1968
valueUri: http://id.worldcat.org/fast/1754386
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Art movements
valueUri: http://id.worldcat.org/fast/815613

description: Part of a collection of letters to Sir Herbert Read from Dame Barbara Hepworth (English artist and sculptor) held in the Herbert Read archive at the University of Leeds, UK. The letters span the time period of 1965 to 1968, and discuss art, the art world and their personal lives. Hepworth apologises for her letter of the day before. She discusses a forthcoming broadcast on her work, and the religious theme and physical setting of some of her work.
X-Ray Luminous Binaries, Metallicity, and the Early Universe
Creators: name: Kaaret, Philip
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: High mass X-ray binaries (HMXBs) may have had a significant impact on the heating of the intergalactic medium in the early universe. Study of HMXBs in nearby, low metallicity galaxies that are local analogues to early galaxies can help us understand early HMXBs. The total luminosity of HMXB populations is dominated by sources at high luminosities. These sources exhibit X-ray spectra that show curvature above 2 keV and the same is likely true of HMXB populations at high redshifts. The spectral curvature changes the K-correction for X-rays from HMXBs in a manner that weakens the constraints on X-ray emission of early HMXBs obtained from the soft X-ray background. Applied to deep X-ray surveys of star forming galaxies, the modified K-correction suggests a moderate increase in the ratio of X-ray luminosity to star formation rate at intermediate redshifts, z=3-5, and is consistent with a large enhancement at high redshifts, z=6-7.
description: 5 pages, to appear in MNRAS, corrected typos, added a reference
Spatially resolved polarization variation of the Crab Nebula
Creators: name: Zuo, Chao
name: Xie, Fei
name: Ge, Mingyu
name: Deng, Wei
name: Liu, Kuan
name: La Monaca, Fabio
name: Di Marco, Alessandro
name: Wei, Wenhao
name: Chen, Wei
Publisher: name: arXiv
Year: 2025
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We examined the spatially resolved polarization variations in the Crab Nebula over 2 yr, using observational data from the Imaging X-ray Polarimetry Explorer, and offer key insights into its magnetic field structures and evolution. The results show significant temporal changes in the polarization degree (PD) across three regions of interest in the 2-8 keV energy band. Regions (a) and (b), located in the northern and the southwestern parts of the study area, exhibit PD variations with significance levels greater than 4 sigma and 3 sigma , respectively. Region (c), located in the southwest,shows a notable decrease in PD with a significance greater than 5 sigma. However, no significant variation in the polarization angle was observed. Meanwhile, notable flux variations were detected, likely influenced by dynamic processes such as magnetized turbulence within the nebula.
Condensation of the atomic relaxation vibrations in lead-magnesium-niobate at $T=T^*$
Creators: name: Prosandeev, Sergey
name: Raevski, Igor P.
name: Malitskaya, Maria A.
name: Raevskaya, Svetlana I.
name: Chen, Haydn
name: Chou, Chen-Chia
name: Dkhil, Brahim
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We present neutron diffraction, dielectric permittivity and photoconductivity measurements, evidencing that lead-magnesium niobate experiences a diffuse phase transformation between the spherical glass and quadrupole glass phases, in the temperature interval between 400 K and 500 K, with the quadrupole phase possessing extremely high magnitudes of dielectric permittivity. Our analysis shows that the integral diffuse scattering intensity may serve as an order parameter for this transformation. Our experimental dielectric permittivity data support this choice. These data are important for the aplications desiring giant dielectric responses, in a wide temperature intervals and not related to electron's excitations.
description: 6 figures
How nanoporous silicon-polypyrrole hybrids flex their muscles in aqueous electrolytes: In operando high-resolution x-ray diffraction and electron tomography-based micromechanical computer simulations
Creators: name: Brinker, Manuel
name: Thelen, Marc
name: May, Manfred
name: Rings, Dagmar
name: Krekeler, Tobias
name: Lakner, Pirmin
name: Keller, Thomas F.
name: Bertram, Florian
name: Huber, Norbert
name: Huber, Patrick
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Applied Physics (physics.app-ph)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Macroscopic strain experiments revealed that Si crystals traversed by parallel, channel-like nanopores functionalized with the muscle polymer polypyrrole exhibit large and reversible electrochemo-mechanical actuation in aqueous electrolytes. On the microscopical level this system still bears open questions, as to how the electrochemical expansion and contraction of PPy acts on to np-Si pore walls and how the collective motorics of the pore array emerges from the single-nanopore behavior. An analysis of in operando X-ray diffraction experiments with micromechanical finite element simulations, based on a 3D reconstruction of the nanoporous medium by TEM tomography, shows that the in-plane mechanical response is dominantly isotropic despite the anisotropic elasticity of the single crystalline host matrix. However, the structural anisotropy originating from the parallel alignment of the nanopores lead to significant differences between the in- and out-of-plane electromechanical response. This response is not describable by a simple 2D arrangement of parallel cylindrical channels. Rather, the simulations highlight that the dendritic shape of the Si pore walls, including pore connections between the main channels, cause complex, inhomogeneous stress-strain fields in the crystalline host. Time-dependent X-ray scattering on the dynamics of the actuator properties hint towards the importance of diffusion limitations, plastic deformation and creep in the nanoconfined polymer upon (counter-)ion adsorption and desorption, the very pore-scale processes causing the macroscopic electroactuation. From a more general perspective, our study demonstrates that the combination of TEM tomography-based micromechanical modeling with high-resolution X-ray scattering experiments provides a powerful approach for in operando analysis of nanoporous composites from the single-nanopore up to the porous-medium scale.
description: Supplementary see ancillary file. 20 pages, 11 figures
Robustness and Reliability of the GM Ignition Switch - A forensic Engineering case
Creators: name: Eifler, Tobias
name: Olesen, Jonas Lerche
name: Howard, Thomas J.
Publisher: name: Technical University of Denmark, DTU : International Symposium on Robust Design
Year: 2014

description: This paper uses forensic engineering from the perspectives of Robust Design and Reliability Engineering to review one of the most infamous recalls in automotive history, that of the GM ignition switch. The design, engineering and management failures in this case ultimately resulted in a fine of $35 million, the recall of 2.6 million vehicles and the death of at least 13 people. In a systematic approach, design clarity, tolerance stack-ups, sensitivity analysis, etc. are used to analyse the ignition switch itself and to extend the usual consideration of reliability issues to the impact of variation on the design. In addition to this quantitative analysis, the legal case files have been examined revealing multiple misjudgments and errors throughout the product development process. The analysis revealed a lack of overview regarding to interrelated functionality, a lack of respect for the requirement specification and clarity in the specification itself, and finally a culture of silence rather than confrontation and remedy.
Robust Design Methodology Process
Creators: name: Arvidsson, Martin
name: Gremyr, Ida
name: Siva, Vanajah
Publisher: name: Technical University of Denmark, DTU : International Symposium on Robust Design
Year: 2014

description: Robust Design Methodology (RDM) has been established as an approach to design products that are reliable and have stable performance despite exposure to variation in uncontrollable factors. Research on RDM has traditionally focused on the application of various tools to support RDM. Less has been written on how RDM practices can be applied throughout a product development (PD) process. This paper presents a study of a medium-sized manufacturing company working with a Product Robustness Process (PRP). PRP is a sub- process in their PD, and focuses mainly on practices supporting RDM and the outcome in terms of increased robustness. An example of a practice is to systematically identify factors that will vary under operating conditions and affect product performance and reliability. By knowledge of such factors it is possible to take robustness into account in early PD phases. In some phases of the PRP, indications of suitable tools are given, however not as a compulsory prescription. The PRP shows how practices of RDM can be made a part of an established PD process. It also aims to focus on practices, rather than tools or techniques, to maximise RDM application. Case studies on RDM are often focusing on tools such as Design of Experiments; albeit important it is of value to consider daily RDM practices without necessarily involving a prescribed tool. This paper aims at contributing to the latter by means of a case study at a company working with a PRP for about two years. The purpose of the paper is to describe and evaluate a process for RDM practices throughout PD. The most important outcome of the PRP is that the development teams have reliased a systematic way to address quality and reliability on the agenda throughout PD.
title: Neuerfundene Reichs-Parlaments-Dampf-Maschine; [1848]
title: Ein tüchtiger Werkführer mit einem guten Feuerschürer kö[n]en mittelst dieses Apparats alle Arten Petitionen u. Adressen auf's schnellste und billigste durchhecheln und raffiniren.
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform der Veröffentlichungsangabe: Lith. Anst. von J. E. Mittenzwey in Frankfurt a/M.
A Large Scale Magneto-ionic Fluctuation in the Local Environment of Periodic Fast Radio Burst Source, FRB 20180916B
Creators: name: Mckinven, R.
name: Gaensler, B. M.
name: Michilli, D.
name: Masui, K.
name: Kaspi, V. M.
name: Bhardwaj, M.
name: Cassanelli, T.
name: Chawla, P.
name: Dong, F. Adam
name: Fonseca, E.
name: Leung, C.
name: Li, D. Z.
name: Ng, C.
name: Patel, C.
name: Petroff, E.
name: Pearlman, A. B.
name: Pleunis, Z.
name: Rafiei-Ravandi, M.
name: Rahman, M.
name: Sand, K. R.
name: Shin, K.
name: Scholz, P.
name: Stairs, I. H.
name: Smith, K.
name: Su, J.
name: Tendulkar, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Fast radio burst (FRB) source 20180916B exhibits a 16.33-day periodicity in its burst activity. It is as of yet unclear what proposed mechanism produces the activity, but polarization information is a key diagnostic. Here, we report on the polarization properties of 44 bursts from FRB 20180916B detected between 2018 December and 2021 December by CHIME/FRB, the FRB project on the Canadian Hydrogen Intensity Mapping Experiment the Canadian Hydrogen Intensity Mapping Experiment. In contrast to previous observations, we find significant variations in the Faraday rotation measure (RM) of FRB 20180916B. Over the nine month period 2021 April$-$2021 December we observe an apparent secular increase in $\rm{RM}$ of $\sim 50 \; \rm{rad\, m^{-2}}$ (a fractional change of over $40\%$) that is accompanied by a possible drift of the emitting band to lower frequencies. This interval displays very little variation in the dispersion measure ($Δ\rm{DM}\lesssim 0.8\; \rm{pc\, cm^{-3}}$) which indicates that the observed RM evolution is likely produced from coherent changes in the Faraday-active medium's magnetic field. Burst-to-burst RM variations appear unrelated to the activity cycle phase. The degree of linear polarization of our burst sample ($\gtrsim 80\%$) is consistent with the negligible depolarization expected for this source in the 400-800 MHz bandpass of CHIME. FRB 20180916B joins other repeating FRBs in displaying substantial RM variations between bursts. This is consistent with the notion that repeater progenitors may be associated with young stellar populations by their preferential occupation of dynamic magnetized environments commonly found in supernova remnants, pulsar wind nebulae or near high mass stellar companions.
Letter from Barbara Hepworth to Herbert Read, June 02, 1968
Creators: name: Hepworth, Barbara, 1903-1975
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Art movements
valueUri: http://id.worldcat.org/fast/815613
subject: Artists
valueUri: http://id.worldcat.org/fast/817559
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Artists--Correspondence
valueUri: http://id.worldcat.org/fast/817571
subject: Art historians
valueUri: http://id.worldcat.org/fast/815554
subject: Hepworth, Barbara, 1903-1975
valueUri: http://id.worldcat.org/fast/1898202
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Women artists
valueUri: http://id.worldcat.org/fast/1177159
subject: Read, Herbert, 1893-1968
valueUri: http://id.worldcat.org/fast/1754386
subject: Authors, English--Correspondence
valueUri: http://id.worldcat.org/fast/821953

description: Barbara Hepworth (English artist and sculptor) held in the Herbert Read archive at the University of Leeds, UK. The letters span the time period of 1965 to 1968, and discuss art, the art world and their personal lives. Hepworth has been trying to rest, and has been reading Read's books and enjoying her garden. She wishes to learn from Read's courage and his strength.
Optimized projections for compressed sensing via rank-constrained nearest correlation matrix
Creators: name: Cleju, Nicolae
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Optimizing the acquisition matrix is useful for compressed sensing of signals that are sparse in overcomplete dictionaries, because the acquisition matrix can be adapted to the particular correlations of the dictionary atoms. In this paper a novel formulation of the optimization problem is proposed, in the form of a rank-constrained nearest correlation matrix problem. Furthermore, improvements for three existing optimization algorithms are introduced, which are shown to be particular instances of the proposed formulation. Simulation results show notable improvements and superior robustness in sparse signal recovery.
description: 25 pages, 13 figures, to appear in Applied and Computational Harmonic Analysis
An Exploration of Community Health
Creators: name: Stancioff, Charlotte Eloise
Publisher: name: Columbia University
Year: 2011
Subjects: Rural health services
Medicine
Public health

description: While living in the Nova Suiça settlement, I studied the MST’s use of medicinal plants in conjunction with the SUS community health programs found at the nearby health clinic. By interviewing settlers and health professionals, administering MST community surveys, and conducting fieldwork on the use of medicinal plants, I gained a more complete understanding of both the SUS public health programs and traditional MST medicine.
Research in Brazil leads to reflections on community health programs.
Robust Design Principles to Evaluate Additive Manufacturing Capabilities
Creators: name: Flores, Iñigo
name: Coatanea, Eric
name: Salmi, Mika
name: Tuomi, Jukka
Publisher: name: Technical University of Denmark, DTU : International Symposium on Robust Design
Year: 2014

description: Additive manufacturing (AM) is generating a paradigm shift by expanding the manufacturing capabilities. However, quality of AM produced parts is dependent on a number of machine, geometry and process parameters.
The impact of inputs, such as the machine technology, the part orientation, the part location and the quality of the digital data, affects the AM outcomes drastically. A new user faces the problem of selecting optimal sets of input variables and therefore, it is necessary to support this selection process that is based typically in tacit knowledge of the machine operator or service suppliers.
The present research has proposed a “composite” methodology integrating Taguchi design of experiments, multi-objective optimization and statistical process control, to optimize the manufacturing process and fulfil multiple requirements imposed to an arbitrary geometry. This study provides a comparative assessment of AM technologies and optimal process parameters. During the experiment, three conflicting requirements were imposed to a case geometry. Two of them, at the macro level, evaluated dimensional and geometrical tolerances. The third one, at the micro level, evaluated the surface quality of the produced parts.
The outcomes of the experiment indicate that only one machine (M1, Stereolithography), was feasible to simultaneously fulfil macro and micro level requirements. In addition, the process was capable but not centred according to production standards. Future study including mechanical performance variables, interaction between variables and impact of noise factors is planned.
Queues and risk processes with dependencies
Creators: name: Badila, E. S.
name: Boxma, O. J.
name: Resing, J. A. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K25, 91B30

description: We study the generalization of the G/G/1 queue obtained by relaxing the assumption of independence between inter-arrival times and service requirements. The analysis is carried out for the class of multivariate matrix exponential distributions introduced in [12]. In this setting, we obtain the steady state waiting time distribution and we show that the classical relation between the steady state waiting time and the workload distributions re- mains valid when the independence assumption is relaxed. We also prove duality results with the ruin functions in an ordinary and a delayed ruin process. These extend several known dualities between queueing and risk models in the independent case. Finally we show that there exist stochastic order relations between the waiting times under various instances of correlation.
Global symmetry and conformal bootstrap in the two-dimensional $Q$-state Potts model
Creators: name: Nivesvivat, Rongvoram
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The Potts conformal field theory is an analytic continuation in the central charge of conformal field theory describing the critical two-dimensional $Q$-state Potts model. Four-point functions of the Potts conformal field theory are dictated by two constraints: the crossing-symmetry equation and $S_Q$ symmetry. We numerically solve the crossing-symmetry equation for several four-point functions of the Potts conformal field theory for $Q\in\mathbb{C}$. In all examples, we find crossing-symmetry solutions that are consistent with $S_Q$ symmetry of the Potts conformal field theory. In particular, we have determined their numbers of crossing-symmetry solutions, their exact spectra, and a few corresponding fusion rules. In contrast to our results for the $O(n)$ model, in most of examples, there are extra crossing-symmetry solutions whose interpretations are still unknown.
description: 26 pages: v2, comments by referees and clarifications
Reeling Brouwer, Rinse; Hirs, Frans-Joseph: Die Erlösung unseres Leibes
Creators: name: Brinkschröder, Michael
Publisher: name: Werkstatt Schwule Theologie
Year: 1970

description: Werkstatt Schwule Theologie, Bd. 3 Nr. 1 (1996): Werkstatt Schwule Theologie, Band 3, Heft 1
Status of ITER neutral beam cell remote handling system
Creators: name: Sykes, N
name: Belcher, C
name: Choi, C-H
name: Crofts, O
name: Crowe, R
name: Damiani, C
name: Delavalle, S
name: Meredith, L
name: Mindham, T
name: Raimbach, J
name: Tesini, A
name: Van Uffelen, M
Publisher: name: arXiv
Year: 2013
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: FOS: Physical sciences

description: The ITER neutral beam cell will contain up to three heating neutral beams and one diagnostic neutral beam, and four upper ports. Though manual maintenance work is envisaged within the cell, when containment is breached, or the radiological protection is removed the maintenance must be conducted remotely. This maintenance constitutes the removal and replacement of line replaceable units, and their transport to and from a cask docked to the cell. A design of the remote handling system has been prepared to concept level which this paper describes including the development of a beam line transporter, beam source remote handling equipment, upper port remote handling equipment and equipment for the maintenance of the neutral shield. This equipment has been developed complete the planned maintenance tasks for the components of the neutral beam cell and to have inherent flexibility to enable as yet unforeseen tasks and recovery operations to be performed.
description: 4 pages, 9 figures
Gravitational-wave cosmology with dark sirens: state of the art and perspectives for 3G detectors
Creators: name: Mancarella, Michele
name: Borghi, Nicola
name: Foffa, Stefano
name: Genoud-Prachex, Edwin
name: Iacovelli, Francesco
name: Maggiore, Michele
name: Moresco, Michele
name: Schulz, Matteo
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: A joint fit of the mass and redshift distributions of the population of Binary Black Holes detected with Gravitational-Wave observations can be used to obtain constraints on the Hubble parameter and on deviations from General Relativity in the propagation of Gravitational Waves. We first present applications of this technique to the latest catalog of Gravitational-Wave events, focusing on the comparison of different parametrizations for the source-frame mass distribution of Black Hole Binaries. We find that models with more than one feature are favourite by the data, as suggested by population studies, even when varying the cosmology. Then, we discuss perspectives for the use of this technique with third generation Gravitational-Wave detectors, exploiting the recently developed Fisher information matrix Python code GWFAST.
description: 5 pages, 2 figures, Contribution to the ICHEP 2022 conference proceedings
Development For Tibetans, But By Whom?
Creators: name: Jue, Diana
Publisher: name: Columbia University
Year: 2011
Subjects: Rural development
Regional planning
Economics
International relations

description: The Tibet-China debate is entrenched in ethnic history, politics, and tension. Regardless of these realities, Tibetans throughout China's underdeveloped West are among the poorest nationalities in the country. These field notes highlight and evaluate development efforts instated by three types of entities: the state, foreign development organizations, and local Tibetan development organizations. Many people want to help Tibet, but who is the most appropriate and able?
Hierarchical fragmentation and differential star formation in the Galactic "Snake": infrared dark cloud G11.11-0.12
Creators: name: Wang, Ke
name: Zhang, Qizhou
name: Testi, Leonardo
name: van der Tak, Floris
name: Wu, Yuefang
name: Zhang, Huawei
name: Pillai, Thushara
name: Wyrowski, Friedrich
name: Carey, Sean
name: Ragan, Sarah E.
name: Henning, Thomas
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present Submillimeter Array (SMA) $λ=$ 0.88 and 1.3 mm broad band observations, and the Jansky Very Large Array (VLA) observations in $\rm{NH_3}$ $(J,K) = (1,1)$ up to $(5,5)$, $\rm{H_2O}$ and $\rm{CH_3OH}$ maser lines toward the two most massive molecular clumps in infrared dark cloud (IRDC) G11.11-0.12. Sensitive high-resolution images reveal hierarchical fragmentation in dense molecular gas from the $\sim 1$ pc clump scale down to $\sim 0.01$ pc condensation scale. At each scale, the mass of the fragments is orders of magnitude larger than the Jeans mass. This is common to all four IRDC clumps we studied, suggesting that turbulence plays an important role in the early stages of clustered star formation. Masers, shock heated $\rm{NH_3}$ gas, and outflows indicate intense ongoing star formation in some cores while no such signatures are found in others. Furthermore, chemical differentiation may reflect the difference in evolutionary stages among these star formation seeds. We find $\rm{NH_3}$ ortho/para ratios of $1.1\pm0.4$, $2.0\pm0.4$, and $3.0\pm0.7$ associated with three outflows, and the ratio tends to increase along the outflows downstream. Our combined SMA and VLA observations of several IRDC clumps present the most in depth view so far of the early stages prior to the hot core phase, revealing snapshots of physical and chemical properties at various stages along an apparent evolutionary sequence.
description: 21 pages, 11 figures, 8 tables, accepted to MNRAS; this version includes minor typo corrections from proof
Letter from Barbara Hepworth to Herbert Read, December 10, 1967
Creators: name: Hepworth, Barbara, 1903-1975
Publisher: name: University of Victoria Libraries
Year: 2023
Subjects: subject: Artists
valueUri: http://id.worldcat.org/fast/817559
subject: Poets
valueUri: http://id.worldcat.org/fast/1067778
subject: Authors, English
valueUri: http://id.worldcat.org/fast/821945
subject: Women artists
valueUri: http://id.worldcat.org/fast/1177159
subject: Hepworth, Barbara, 1903-1975
valueUri: http://id.worldcat.org/fast/1898202
subject: Authors
valueUri: http://id.worldcat.org/fast/821688
subject: Authors, English--Correspondence
valueUri: http://id.worldcat.org/fast/821953
subject: Poets, English
valueUri: http://id.worldcat.org/fast/1067870
subject: Art historians
valueUri: http://id.worldcat.org/fast/815554
subject: Art movements
valueUri: http://id.worldcat.org/fast/815613
subject: Artists--Correspondence
valueUri: http://id.worldcat.org/fast/817571
subject: Read, Herbert, 1893-1968
valueUri: http://id.worldcat.org/fast/1754386

description: Part of a collection of letters to Sir Herbert Read from Dame Barbara Hepworth (English artist and sculptor) held in the Herbert Read archive at the University of Leeds, UK. The letters span the time period of 1965 to 1968, and discuss art, the art world and their personal lives. Hepworth mentions health and family concerns.
Quantum kinetics of spinning neutral particles: General theory and Spin wave dispersion
Creators: name: Andreev, P. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Plasma physics give an example of physical system of particles with the long range interaction. At small velocity of particles we can consider the plasma approximately as a system of particles with the Coulomb interaction. The Coulomb interaction is isotropic. Systems of spinning neutral particles have long-range anisotropic interparticle interaction. So, they can reveal more reach properties than plasma. Furthermore for studying of systems of spinning particles we can develop kinetic and hydrodynamic methods analogous to used for the plasma. We derive kinetic equations by a new method, which is the generalization of the many-particle quantum hydrodynamics. Obtained set of kinetic equations is truncated, so we have closed set of two equations. One of them is the kinetic equation for quantum distribution function. The second equation is the equation for the spin-distribution. Which describes the spin kinetic evolution and gives contribution in time evolution of the distribution function. Our method allows to obtain equations as for three dimensional system of particles and for low dimensional systems. So, we consider spin waves in three- and two dimensional systems of neutral spinning particles.
description: 15 pages
Finite groups with small automizers for every abelian subgroup of non prime power order
Creators: name: Dwivedi, Ritesh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 20D10, 20D15, 20D25

description: In this paper, we discuss about finite groups in which, CGH = NGH, for every abelian subgroup H of non prime power order. Also, we classify all such nilpotent and minimal non nilpotent groups.
description: 8 pages
Toppling the Tripod: Sustainable Development, Constructive Ambiguity and the Environmental Challenge
Creators: name: Moore, Frances C.
Publisher: name: Columbia University
Year: 2011
Subjects: Global environmental change--Government policy
Environmental policy--Political aspects
Sustainable development--Evaluation
Public policy (Law)
Environmental economics
Sustainability

description: Discussions of global environmental governance seem to have gotten nowhere in the last thirty years despite environmental problems that continue to grow in scope and magnitude. Here, the role of sustainable development in that failure is examined, particularly the constructively ambiguous nature of the paradigm. It is suggested that an emphasis on the shifting, contextualized and relative term ―"needs" in the definition of sustainable development has led to paralysis at the international level in addressing environmental problems, particularly climate change. Contradictions that emerge when sustainable development is formalized in economic models as weak and strong sustainability are discussed. Finally, promising future pathways for environmental actions are explored.
Seth, Logos und Zwangsheterosexualität im Christentum
Creators: name: Brinkschröder, Michael
Publisher: name: Werkstatt Schwule Theologie
Year: 1970

description: Werkstatt Schwule Theologie, Bd. 3 Nr. 1 (1996): Werkstatt Schwule Theologie, Band 3, Heft 1
EleCa: a Monte Carlo code for the propagation of extragalactic photons at ultra-high energy
Creators: name: Settimo, Mariangela
name: De Domenico, Manlio
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Ultra high energy photons play an important role as an independent probe of the photo-pion production mechanism by UHE cosmic rays. Their observation, or non-observation, may constrain astrophysical scenarios for the origin of UHECRs and help to understand the nature of the flux suppression observed by several experiments at energies above 10$^{19.5}$ eV. Whereas the interaction length of UHE photons above 10$^{17}$ eV is only of a few hundred kpc up to tenths of Mpc, photons can interact with the extragalactic background radiation leading to the development of electromagnetic cascades which affect the fluxes of photons observed at Earth. The interpretation of the current experimental results rely on the simulations of the UHE photon propagation. In this contribution, we present the novel Monte Carlo code "EleCa" to simulate the \emph{Ele}ctromagnetic \emph{Ca}scading initiated by high-energy photons and electrons. The distance within which we expect to observe UHE photons is discussed and the flux of GZK photons at Earth is investigated in several astrophysical scenarios.
description: contr.id 0918, 33nd International Cosmic Ray Conference - 2013 - Rio de Janeiro, Brazil
Einige Thesen zur Standortbestimmung Schwuler Theologie
Creators: name: Schürger, Wolfgang
Publisher: name: Werkstatt Schwule Theologie
Year: 1970

description: Werkstatt Schwule Theologie, Bd. 3 Nr. 1 (1996): Werkstatt Schwule Theologie, Band 3, Heft 1