cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Spin transport parameters in metallic multilayers determined by ferromagnetic resonance measurements of spin pumping
Creators: name: Boone, C. T.
name: Nembach, H. T.
name: Shaw, J. M.
name: Silva, T. J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We measured spin transport in nonferromagnetic (NM) metallic multilayers from the contribution to damping due to spin pumping from a ferromagnetic Co90Fe10 thin film. The multilayer stack consisted of NM1/NM2/Co90Fe10(2 nm)/NM2/NM3 with varying NM materials and thicknesses. Using conventional theory for one dimensional diffusive spin transport in metals, we show that the effective damping due to spin pumping can be strongly affected by the spin transport properties of each NM in the multilayer, which permits the use of damping measurements to accurately determine the spin transport properties of the various NM layers in the full five-layer stack. We find that due to its high electrical resistivity, amorphous Ta is a poor spin conductor, in spite of a short spin-diffusion length of 1.0 nm, and that Pt is an excellent spin conductor by virtue of its low electrical resistivity and a spin diffusion length of only 0.5 nm. Spin Hall effect measurements may have underestimated the spin Hall angle in Pt by assuming a much longer spin diffusion length.
description: Submitted to Phys. Rev. B
First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass
Creators: name: The Event Horizon Telescope Collaboration
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: In this paper we quantify the temporal variability and image morphology of the horizon-scale emission from Sgr A*, as observed by the EHT in 2017 April at a wavelength of 1.3 mm. We find that the Sgr A* data exhibit variability that exceeds what can be explained by the uncertainties in the data or by the effects of interstellar scattering. The magnitude of this variability can be a substantial fraction of the correlated flux density, reaching $\sim$100\% on some baselines. Through an exploration of simple geometric source models, we demonstrate that ring-like morphologies provide better fits to the Sgr A* data than do other morphologies with comparable complexity. We develop two strategies for fitting static geometric ring models to the time-variable Sgr A* data; one strategy fits models to short segments of data over which the source is static and averages these independent fits, while the other fits models to the full dataset using a parametric model for the structural variability power spectrum around the average source structure. Both geometric modeling and image-domain feature extraction techniques determine the ring diameter to be $51.8 \pm 2.3$ $μ$as (68\% credible intervals), with the ring thickness constrained to have an FWHM between $\sim$30\% and 50\% of the ring diameter. To bring the diameter measurements to a common physical scale, we calibrate them using synthetic data generated from GRMHD simulations. This calibration constrains the angular size of the gravitational radius to be $4.8_{-0.7}^{+1.4}$ \mathrm{μas}, which we combine with an independent distance measurement from maser parallaxes to determine the mass of Sgr A* to be $4.0_{-0.6}^{+1.1} \times 10^6$ M$_{\odot}$.
description: 65 pages, 35 figures, published in The Astrophysical Journal Letters on May 12, 2022. See the published paper for the full authors list
Partitions of AG(4,3) into Maximal Caps
Creators: name: Follett, Michael
name: Kalail, Kyle
name: McMahon, Elizabeth
name: Pelland, Catherine
name: Won, Robert
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 51E15

description: In a geometry, a maximal cap is a collection of points of largest size containing no lines. In AG(4,3), maximal caps contain 20 points. The 81 points of AG(4,3) can be partitioned into 4 mutually disjoint maximal caps together with a single point P, where every pair of points that makes a line with P lies entirely inside one of those caps. The caps in a partition can be paired up so that both pairs are either in exactly one partition or they are both in two different partitions. This difference determines the two equivalence classes of partitions of AG(4,3) under the action by affine transformations.
description: 9 pages, 10 figures
Four-body bound states in momentum space: the Yakubovsky approach without two-body $t-$matrices
Creators: name: Mohammadzadeh, M.
name: Radin, M.
name: Mohseni, K.
name: Hadizadeh, M. R.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: This study presents a solution to the Yakubovsky equations for four-body bound states in momentum space, bypassing the common use of two-body $t-$matrices. Typically, such solutions are dependent on the fully-off-shell two-body $t-$matrices, which are obtained from the Lippmann-Schwinger integral equation for two-body subsystem energies controlled by the second and third Jacobi momenta. Instead, we use a version of the Yakubovsky equations that doesn't require $t-$matrices, facilitating the direct use of two-body interactions. This approach streamlines the programming and reduces computational time. Numerically, we found that this direct approach to the Yakubovsky equations, using 2B interactions, produces four-body binding energy results consistent with those obtained from the conventional $t-$matrix dependent Yakubovsky equations, for both separable (Yamaguchi and Gaussian) and non-separable (Malfliet-Tjon) interactions.
Stochastic Geometry-based Trajectory Design for Multi-Purpose UAVs: Package and Data Delivery
Creators: name: Qin, Yujie
name: Kishk, Mustafa A.
name: Alouini, Mohamed-Slim
Publisher: name: arXiv
Year: 2023
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: With the advancements achieved in drones' flexibility, low cost, and high efficiency, they obtain huge application opportunities in various industries, such as aerial delivery and future communication networks. However, the increasing transportation needs and expansion of network capacity demands for UAVs will cause aerial traffic conflicts in the future. To address this issue, in this paper, we explore the idea of multi-purpose UAVs, which act as aerial wireless communication data relays and means of aerial transportation simultaneously to deliver data and packages at the same time. While UAVs deliver the packages from warehouses to residential areas, we design their trajectories which enable them to collect data from multiple Internet of Things (IoT) clusters and forward the collected data to terrestrial base stations (TBSs). To select the serving nearby IoT clusters, UAVs rank them based on their priorities and distances. From the perspectives of data and package delivery, respectively, we propose two algorithms that design the optimal UAVs trajectory to maximize the transmitted data or minimize the round trip time. Specifically, we use tools from stochastic geometry to model the locations of IoT clusters and TBSs. Given the nature of random locations, the proposed algorithm applies to general cases. Our numerical results show that multi-purpose UAVs are practical and have great potential to enhance the energy/time-efficiency of future networks.
Bright Ray-like Features in the Aftermath of CMEs: White Light vs UV Spectra
Creators: name: Ciaravella, A.
name: Webb, D. F.
name: Giordano, S.
name: Raymond, J. C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Current sheets are important signatures of magnetic reconnection in the eruption of confined solar magnetic structures. Models of Coronal Mass Ejections (CMEs) involve formation of a current sheet connecting the ejected flux rope with the post eruption magnetic loops. Current sheets have been identified in white light images of CMEs as narrow rays trailing the outward moving CME core, and in ultraviolet spectra as narrow bright features emitting the Fe XVIII line. In this work samples of rays detected in white light images or in ultraviolet spectra have been analyzed. Temperatures, widths, and line intensities of the rays have been measured, and their correlation to the CME properties has been studied. The samples show a wide range of temperatures with hot, coronal and cool rays. In some cases, the UV spectra support the identification of rays as current sheets, but they show that some white light rays are cool material from the CME core. In many cases, both hot and cool material are present, but offset from each other along the UltraViolet Coronagraph Spectrometer (UVCS) slit. We find that about 18% of the white light rays show very hot gas consistent with the current sheet interpretation, while about 23% show cold gas that we attribute to cool prominence material draining back from the CME core. The remaining events have ordinary coronal temperatures, perhaps because they have relaxed back to a quiescent state.
description: 15 pages, 11 figures, 2 tables. Accepted for publication in ApJ
Arrayed Continuous-wave THz Photomixers
Creators: name: Bauerschmidt, S. T.
name: Malzer, S.
name: Döhler, G. H.
name: Lu, H.
name: Gossard, A. C.
name: Preu, S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We present both chip-scale and free space coherent arrays of continuous-wave THz photomixers. By altering the relative phases of the exciting laser signals, the relative THz phase between the array elements can be tuned, allowing for beam steering. The constructive interference of the emission of N elements leads to an increase of the focal intensity by a factor of NxN while reducing the beam width by ~1/N, below the diffraction limit of a single source. Such array architectures strongly improve the THz power distribution for stand-off spectroscopy and imaging systems while providing a huge bandwidth at the same time. We demonstrate this by beam profiles generated by a free space 2x2 and a 4x1 array for a transmission distance of 4.2 meters. Spectra between 70 GHz and 1.1 THz have been recorded with these arrays.
The development of a pilot ‘thinking about relationships prompt sheet’ within an alcohol and other drugs rehabilitation programme
Creators: name: Anderson, Bella
name: Furlong, Mark
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 4409
subject: Social work
classificationCode: 5201
subject: Applied and developmental psychology
classificationCode: 5203
subject: Clinical and health psychology

description: This paper documents the development of a programme component within an alcohol and other drugs residential service. Designed to improve relational competence, this pilot component was designed to have multiple levels of function: from the specific, for example, stimulating residents to formulate and monitor relationally oriented goals, to the more pacific, for example, embedding relationally focused learning as an ongoing rehabilitative concern. Development of the component began with a literature review. After finalising a set of relationship types (friends, siblings, etc.), this review identified three domains: ‘values’, ‘knowledge’ and ‘skills’. To create an initial draft, these categories were populated by items selected from a multi-stage inspection of the relevant literature. This draft was then reviewed by multiple stakeholder groups. Feedback from these consultations resulted in substantial modifications to the initial draft. In addition to the component having a broad-spectrum interventive purpose, the authors propose that this component could play a role in (i) pre-admission assessment and (ii) programme evaluation insofar as data concerning individual residents are aggregated and analysed.
Performance Analysis of the Ordered V-BLAST Approach over Nakagami-m Fading Channels
Creators: name: Miridakis, Nikolaos I.
name: Vergados, Dimitrios D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Information Theory (cs.IT)
subject: Systems and Control (eess.SY)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The performance of the V-BLAST approach, which utilizes successive interference cancellation (SIC) with optimal ordering, over independent Nakagami-m fading channels is studied. Systems with two transmit and n receive antennas are employed whereas the potential erroneous decision of SIC is also considered. In particular, tight closed-form bound expressions are derived in terms of the average symbol error rate (ASER) and the outage probability, in case of binary and rectangular M-ary constellation alphabets. The mathematical analysis is accompanied with selected performance evaluation and numerical results, which demonstrate the usefulness of the proposed approach.
Master equation approach to conductivity of bosonic and fermionic carriers in one- and two-dimensional lattices
Creators: name: Kolovsky, Andrey R.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We discuss the master equation approach to diffusive current of bosonic or fermionic carriers in one- and two-dimensional lattices. This approach is shown to reproduce all known results of the linear response theory, including the integer quantum Hall effect for fermionic carriers. The main advantage of the approach is that it allows to calculate the current beyond the linear response regime where new effects are found. In particular, we show that the Hall current can be inverted by changing orientation of the static force (electric field) relative to the primary axes of the lattice.
description: 22 pages, 9 figures
Impact of induced summer drought and nitrogen fertilizer application method on net exchange of nitrous oxide and methane in arable soils
Creators: name: Deppe, Marianna
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2016
Subjects: subject: N2O emission
subject: CULTAN
subject: nitrification
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: [no abstract]
Increasing Boundary Layer Stability for Varying Degrees of Diffuser Loading
Creators: name: Mimic, Dajan
name: Jätz, Christoph
name: Sauer, Philipp
name: Herbst, Florian
Publisher: name: Zug : Global Power and Propulsion Society
Year: 2018
Subjects: subject: Dewey Decimal Classification::600 | Technik

description: Increasing the pressure recovery in diffusers is an ongoing endeavour in engineering. In this paper, we analyse, based on extensive numerical simulations and experiments conducted for a wide range of half-opening angles, the effect of boundary layer stability on pressure recovery in diffusers under the influence of an unsteady rotor outflow. We present, based on integral stage design parameters, analytically devised and empirically confirmed correlations for the quantification of additional pressure recovery in diffusers under non-uniform, unsteady inflow conditions and their sensitivity to the half-opening angle. We demonstrate that the sensitivity of the pressure recovery to the half-opening angle is caused mainly by a change of the effective area ratio due to blockage effects and provide a simple ansatz to estimate the magnitude of this effect. The estimate is shown to agree with experimental and numerical data. We define a parameter, based on the diffusion of vorticity, to quantify the processes that stabilise the boundary layer and, for the first time, present a correlation that unites a wide range of different half-opening angles.
Influence of wave load variations on offshore wind turbine structures
Creators: name: Glisic, Ana
name: Ferraz, Goncalo T.
name: Schaumann, Peter
Publisher: name: Leibniz Universität Hannover
Year: 2017
Subjects: subject: Offshore wind turbine
subject: Wind energy
subject: Wave load variations
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::624 | Ingenieurbau und Umwelttechnik
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft::333 | Boden- und Energiewirtschaft::333,7 | Natürliche Ressourcen, Energie und Umwelt

description: Nowadays, much attention is payed to the development of renewable energy resources. Wind energy plays a major role in this issue. That is why there is a growing interest for improving the design process of wind turbines at many aspects. This study compares two types of offshore wind turbines structures, the monopile and the jacket structure, in their dependency on wave load characteristics’ variations. The examined wave characteristics are significant wave height and wave peak period. The jacket structure showed lower influence of increase of wave height to stresses in the cross section at the bottom of the structure compared to the monopile structure. The monopile structure showed slight dependency of stresses on increasing wave frequency, while the jacket structure showed nearly no dependency, due to its more complex geometry and higher stiffness.
Phase-resolved ultraviolet spectroscopy of the magnetic Of?p star HD 191612
Creators: name: Marcolino, W. L. F.
name: Bouret, J. -C.
name: Sundqvist, J. O.
name: Walborn, N. R.
name: Fullerton, A. W.
name: Howarth, I. D.
name: Wade, G. A.
name: ud-Doula, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present for the first time phase-resolved UV spectroscopy of an Of?p star, namely, HD 191612. The observations were acquired with the Space Telescope Imaging Spectrograph (STIS) on-board the Hubble Space Telescope (HST). We report the variability observed in the main photospheric and wind features and compare the results with previous findings for the Of?p star HD 108. We show that UV line strengths, H(alpha), and longitudinal magnetic field, vary coherently according to the rotational period (P = 537.6d), providing additional support for the magnetic oblique rotator scenario. The stellar and wind parameters of HD 191612 are obtained based on NLTE expanding atmosphere models. The peculiar wind line profile variations revealed by the new STIS data - not reproduced by 1D atmosphere models - are addressed through non-spherical MHD simulations coupled with radiative transfer. The basic aspects of the UV variability observed are explained and the structure of the dynamical magnetosphere of HD 191612 is discussed.
description: Accepted for publication in MNRAS (9 pages, 6 figures, 3 tables)
Growing leaders from below: Identity-based worker education and identity-leader ability among self-employed women in India
Creators: name: Jay, Sarah
name: Nightingale, Alastair
name: Bali, Namrata
name: Ryklief, Sahra
name: Adshead, Maura
Publisher: name: University of Limerick
Year: 2023
Subjects: subject: Sociology
subject: FOS: Sociology
subject: Public administration

description: Informal and unregulated work is the norm rather than the exception in emerging economies. This study was conducted in India where nine out of 10 women are occupied in informal, unregulated work, and are vulnerable to low-wages, exploitation, and interconnected cultural and social-economic injustices. The Self-Employed Women's Association (SEWA) and their education wing the Indian Academy of Self-Employed Women encourage their members to self-define as “self-employed workers” and facilitate identity-based worker education and leadership training. Drawing on insights from the Social Identity Approach to Learning and the New Psychology of Leadership this cross-sectional study (N = 300) explored if this shared social identity significantly predicted participants perceived identity-leadership ability. We further explored if this relationship was partially explained by SEWA norms, values, and beliefs, developed during learning, and measured as “awareness of gendered inequality”, “injustice consciousness”, and “collective efficacy”. A parallel mediation analysis found a direct relationship between “self-employed women identity” and “identity-leader ability” and indirect relationships through “awareness of gendered inequality” and “collective efficacy”. No indirect path was evident through “injustice consciousness”. The theoretical and practical implications of an identity-based approach to worker education and leader training among vulnerable workers, are discussed.
Influence of foaming agents on laser based manufacturing of closed-cell Ti foam
Creators: name: Pape, Florian
name: Noelke, Christian
name: Kaierle, Stefan
name: Haferkamp, Heinz
name: Gesing, Thorsten M.
Publisher: name: Amsterdam : Elsevier
Year: 2014
Subjects: subject: Ti Foam
subject: Foaming agents
subject: Laser based foaming
subject: Ti implants
subject: Nanoindendation
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: Titanium offers a high specific strength, low density, and excellent corrosion resistance. It finds application in many fields like automotive, aerospace, drilling, and biomedical industries. To improve the adherence of bone cells on implants a rough surface can be of advantage. Such a surface is featured by a foamed stru cture. For achieving a foamed Ti structure, laser induced foami ng was used. In this case, Ti powder is pre mixed with foaming agents. The foaming agents are degraded by laser induced energy and produce gaseous products like carbon dioxide, while the Ti powder is molten by the laser. Due to the fast cooling rate carb on dioxide forms gaseous bubbles in the solidifying material. Mandatory for the foaming agents is that they are biocompatible. Previous studies using the foaming agents CaCO 3 , MgCO 3 , MgTiO 3 , and MgTiO 3 mixed to Ti powder resulted in a porosity of up to 0.3. By varying the content of the foaming agent por osity and pore diameter of the samples were adjusted. It is expected that an increased porosity could be achieved by mixing the foaming agents among each other. The influence of the specific foaming agents and their mixtures on the porosity is pres ented in this work. By mixing the foaming agents together and adding them to the powder, the porosity of the samples was increased compared to only adding one foaming agent to the powder.
High temperature collective spin-photon coupling in a microwave cavity
Creators: name: Baibekov, E. I.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: An ensemble of N identical noninteracting spins being in thermal equilibrium and coupled to the resonant mode of a lossless microwave cavity is studied at arbitrary temperature T. Near T = 0 the system is known to be in a coupled spin-photon state that manifests itself by the splitting of the cavity mode (vacuum Rabi splitting). The cavity emission spectrum is simulated for arbitrary T. It is shown that the spin-photon coherence can be partially preserved for T < w sqrt{N}/2, where w is the spin excitation energy, even in case when the spins are randomly directed. The calculations corroborate recent room-temperature observations of the collective coupling between the microwave cavity mode and the electron spin ensemble (NV centers in diamond, DPPH, Fe8 nanomagnets). At higher T, as a consequence of thermal excitations within the spin ensemble, the two lines of the emission spectrum merge into a narrow line with broad wings.
Importance of wild crucifers for diamondback moth, Plutella xylostella L. (Lepidoptera: Plutellidae) and its parasitoids in Kenya
Creators: name: Kahuthia-Gathu, Ruth
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Wild crucifers
subject: diversity
subject: refugia
subject: Plutella xylostella
subject: Diadegma semiclausum
subject: Cotesia plutellae
subject: development
subject: reproductive potential
subject: immigration
subject: Dewey Decimal Classification::500 | Naturwissenschaften::590 | Tiere (Zoologie)
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Improved in vitro bone-like tissue formation by human trabecular bone cells in a novel three dimensional cultivation system
Creators: name: Zghoul, Nadia
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Mesenchymal stem cells
subject: osteogenesis
subject: tissue engineering
subject: Dewey Decimal Classification::600 | Technik::610 | Medizin, Gesundheit

description: [no abstract]
Separation of Variables and Contractions on Two-Dimensional Hyperboloid
Creators: name: Kalnins, Ernie
name: Pogosyan, George S.
name: Yakhno, Alexander
Publisher: name: arXiv
Year: 2012
Subjects: subject: Mathematical Physics (math-ph)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: In this paper analytic contractions have been established in the $R\to\infty$ contraction limit for exactly solvable basis functions of the Helmholtz equation on the two-dimensional two-sheeted hyperboloid. As a consequence we present some new asymptotic formulae.
Improvement of lentil (Lens culinaris Medik.) through genetic transformation
Creators: name: Hashem, Rehana
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Agrobacterium
subject: transgenic lentil
subject: polygalacturonase inhibiting protein
subject: antifungal resistance
subject: marker-free transformation
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Influence of Electron Evaporative Cooling on Ultracold Plasma Expansion
Creators: name: Wilson, Truman
name: Chen, Wei-Ting
name: Roberts, Jacob
Publisher: name: arXiv
Year: 2013
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The expansion of ultracold neutral plasmas (UCP) is driven primarily by the thermal pressure of the electron component and is therefore sensitive to the electron temperature. At lower densities (less than 10$^8$ /cm$^3$), evaporative cooling has a significant influence on the UCP expansion rate. We studied the effect of electron evaporation in this density range. Owing to the low density, the effects of three-body recombination were negligible. We modeled the expansion by taking into account the change in electron temperature owing to evaporation as well as adiabatic expansion and found good agreement with our data. We also developed a simple model for initial evaporation over a range of ultracold plasma densities, sizes, and electron temperatures to determine over what parameter range electron evaporation is expected to have a significant effect. We also report on a signal calibration technique, which relates the signal at our detector to the total number of ions and electrons in the ultracold plasma.
description: 8 pages, 5 figures
Improving robustness of continuous-gravitational-wave searches against signal-like instrumental artefacts and a concept for an octahedral gravitational-wave detector in space
Creators: name: Keitel, David
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Gravitational waves
subject: neutron stars
subject: data analysis
subject: Gravitationswellen
subject: Neutronensterne
subject: Datenanalyse
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: [no abstract]
The Color-Magnitude Diagram of the Globular Cluster M14
Creators: name: Reinhart, Erik D.
name: McCombs, Thayne A.
name: Darragh, Andrew N.
name: Liu, Zheyu J.
name: Murphy, Brian W
name: Conroy, Kyle E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using the SARA 0.9 meter telescope at Kitt Peak National Observatory (KPNO) we obtained R images during the summer of 2010 and V images during the summer of 2012 of the globular cluster M14. These images were analyzed using the DAOPHOT/ALLFRAME package of Stetson (1987,1994) to create a preliminary color-magnitude diagram (CMD) of M14. We have positively identified the positions of 64 of the 112 known RR Lyrae stars on the CMD. We find considerable spread in both the magnitudes and color of the RR Lyrae stars indicating a significant amount of differential reddening on relatively small scales. This is also seen in the giant branch which shows up to ~0.15 magnitude spread in V-R color. We also found the median magnitude of the RR Lyrae stars and hence the horizontal branch to be V=17.2.
description: 4 pages, 2 figures
Quantification of cell contractile behavior based on non-destructive macroscopic measurement of tension forces on bioprinted hydrogel
Creators: name: Pragnere, Sarah
name: Kholti, Naima El
name: Gudimard, Leslie
name: Essayan, Lucie
name: Marquette, Christophe
name: Petiot, Emma
name: Pailler-Mattei, Cyril
Publisher: name: arXiv
Year: 2023
Subjects: subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences

description: Contraction assay based on surface measurement have been widely used to evaluate cell contractility in 3D models. This method is straightforward and requires no specific equipment, but it does not provide quantitative data about contraction forces generated by cells. We expanded this method with a new biomechanical model, based on the work-energy theorem, to provide non-destructive longitudinal monitoring of contraction forces generated by cells in 3D.We applied this method on hydrogels seeded with either fibroblasts or osteoblasts. Hydrogel mechanical characteristics were modulated to enhance (condition HCA$_{High}$: hydrogel contraction assay high contraction) or limit (condition HCA$_{Low}$: hydrogel contraction assay low contraction) cell contractile behaviors. Macroscopic measures were further correlated with cell contractile behavior and descriptive analysis of their physiology in response to different mechanical environments. Fibroblasts and osteoblasts contracted their matrix up to 47% and 77% respectively. Contraction stress peaked at day 5 with 1.1 10$^{-14}$Pa for fibroblasts and 3.5 10$^{-14}$Pa for osteoblasts, which correlated with cell attachment and spreading. Negligible contraction was seen in HCA$_{Low}$. Both fibroblasts and osteoblasts expressed $α$-SMA contractile fibers in HCA$_{High}$ and HCA$_{Low}$. Failure to contract HCA$_{Low}$ was attributed to increased cross-linking and resistance to proteolytic degradation of the hydrogel.
Leptons and Quarks from a Discrete Flavor Symmetry
Creators: name: Ahn, Y. H.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We propose a new model of leptons and quarks based on the discrete flavor symmetry $T'$, the double covering of $A_4$, in which the hierarchies of charged fermion masses and the mildness of neutrino masses are responsible for Higgs scalars. After spontaneous breaking of flavor symmetry, with the constraint of renormalizability in the Lagrangian, the leptons have $m_{e}=0$ and the quarks have the Cabibbo-Kobayashi-Maskawa (CKM) mixing angles $θ^{q}_{12}=13^{\circ}, θ^{q}_{23}=0^{\circ}$ and $θ^{q}_{13}=0^{\circ}$. Thus, certain effective dimension-5 operators are introduced, which induce $m_{e}\neq0$ and lead the quark mixing matrix to the CKM one in form. On the other hand, the neutrino Lagrangian still keeps renormalizability. For completeness, we show numerical analysis: in the lepton sector, only normal mass hierarchy is permitted within $3σ$ experimental bounds with the prediction of both large deviations from maximality in the atmospheric mixing angle $θ_{23}$ and the measured values of reactor angle. So, future precise measurements of $θ_{23}$, whether $θ_{23}\rightarrow45^{\circ}$ or $|θ_{23}-45^{\circ}|\rightarrow5^{\circ}$, will either exclude or favor our model. Together with it, our model makes predictions for the Dirac CP phase, which is almost compatible with the global analysis in $1σ$ experimental bounds. Moreover, we show the effective mass $|m_{ee}|$ measurable in neutrinoless double beta decay to be in the range $0.04\lesssim|m_{ee}|[eV]<0.11$, which can be tested in near future neutrino experiments.
description: 36 pages and 10 figures
Review: progress in NLTE calculations and their application to large data-sets
Creators: name: Mashonkina, L.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: One of the major tasks in interpretation of data from large-scale stellar surveys is to determine the fundamental atmospheric parameters such as effective temperature, surface gravity, and metallicity. In most on-going and upcoming projects, they are derived spectroscopically, with relying on classical one-dimensional (1D) model atmospheres and the assumption of LTE. This review discusses the present achievements and problems of non-local thermodynamic equilibrium (NLTE) line-formation calculations for FGK-type stars. The topics that are addressed include (i) the construction of comprehensive model atoms for the chemical elements with complex term system, (ii) possible systematic errors inherent in classical LTE spectroscopic determinations of stellar parameters and chemical abundances, (iii) the uncertainties in final NLTE results caused by the uncertainties in atomic data, and (iv) applications of the NLTE line-formation calculations coupled to the spatial and temporal average <3D> models to spectroscopic analyses.
description: 11 pages. To appear in Proceedings of the IAU Symposium No. 298, "Setting the scene for Gaia and LAMOST", eds. S. Feltzing, G. Zhao, N. A. Walton, and P. A. Whitelock
Impact of telomere shortening on cell cycle progression and induction of senescence
Creators: name: Satyanarayana, Ande
Publisher: name: Hannover : Universität
Year: 2004
Subjects: subject: Cellular senescence
subject: organ regeneration
subject: telomere shortening
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
Additional file 2 of The microbiota restrains neurodegenerative microglia in a model of amyotrophic lateral sclerosis
Creators: name: Cox, Laura M.
name: Calcagno, Narghes
name: Gauthier, Christian
name: Madore, Charlotte
name: Butovsky, Oleg
name: Weiner, Howard L.
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Neuroscience
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: 60506 Virology

description: Additional file 1: Supplemental Figure 1. Effect of antibiotics on weight in wild-type littermate mice. WT littermate mice were treated with antibiotics (ABX), co-housed with SOD1 mice (CoHo), or untreated (H2O), n = 11-12 per group and change in weight and motor function was assessed until SOD1 mice in each treatment group reached humane endpoint criteria (Fig. 1). a) Weight was increased in antibiotic treated mice. Data represent mean ± standard error of the mean (SEM). Multiple unpaired t-tests, adjusted for false-discovery rate, * q
Trans-Neptunian objects as natural probes to the unknown solar system
Creators: name: Lykawka, Patryk Sofia
Publisher: name: arXiv
Year: 2012
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Trans-Neptunian objects (TNOs) are icy/rocky bodies that move beyond the orbit of Neptune in a region known as the trans-Neptunian belt (or Edgeworth-Kuiper belt). In contrast to the predictions of accretion models that feature protoplanetary disk planetesimals evolving on dynamically cold orbits (with both very small eccentricities, e, and inclinations, i), in reality TNOs exhibit surprisingly wide ranges of orbital eccentricities and inclinations. Several theoretical models have addressed the origin and orbital evolution of the main dynamical classes of TNOs, but none have successfully reproduced them all. In addition, none have explained several objects on peculiar orbits, or provided insightful predictions, without which a model cannot be tested properly against observations. Based on extensive simulations of planetesimal disks with the presence of the four giant planets and huge numbers of modeled planetesimals, I explore in detail the dynamics of the TNOs, in particular their (un)stable regions over timescales comparable to the age of the solar system, and the role of resonances across the entire trans-Neptunian region. I also propose that, along with the orbital history of the giant planets, the orbital evolution of primordial embryos (massive planetesimals comparable to Mars-Earth masses) can explain the fine orbital structure of the trans-Neptunian belt, the orbits of Jovian and Neptunian Trojans, and possibly the current orbits of the giant planets. Those primordial embryos were ultimately scattered by the giant planets, a process that stirred both the orbits of the giant planets and the primordial planetesimal disk to the levels observed at 40-50 AU. In particular, the main constraints provided by the trans-Neptunian belt are optimally satisfied if at least one such primordial embryo (planetoid) survived in the outskirts of the solar system.
description: 112 pages, 28 figures, accepted for publication in Monographs on Environment, Earth and Planets. (The abstract was shortened. Original version can be found in the pdf file)
Improvement of osmotic and salt tolerance in potato (Solanum tuberosum L.) by homologous protein overexpression
Creators: name: El-Banna, Antar Nasr Salem
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: Potato
subject: Agrobacterium
subject: PR10a
subject: cell suspension
subject: osmotolerance
subject: salt tolerance
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
The deceleration of nebular shells in evolved planetary nebulae
Creators: name: Pereyra, Margarita
name: Richer, Michael G.
name: López, José Alberto
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We have selected a group of 100 evolved planetary nebulae (PNe) and study their kinematics based upon spatially-resolved, long-slit, echelle spectroscopy. The data have been drawn from the San Pedro Mártir Kinematic Catalogue of PNe (López et al. 2012). The aim is to characterize in detail the global kinematics of PNe at advanced stages of evolution with the largest sample of homogenous data used to date for this purpose. The results reveal two groups that share kinematics, morphology, and photo-ionization characteristics of the nebular shell and central star luminosities at the different late stages under study.The typical flow velocities we measure are usually larger than seen in earlier evolutionary stages, with the largest velocities occurring in objects with very weak or absent [N II] λ6584 line emission, by all indications the least evolved objects in our sample. The most evolved objects expand more slowly. This apparent deceleration during the final stage of PNe evolution is predicted by hydrodynamical models, but other explanations are also possible. These results provide a template for comparison with the predictions of theoretical models.
description: Accepted for publication in ApJ. It is tentatively scheduled for the July 1, 2013, V771 - 1 issue
Inactivation of RhoA/B/C or H/K/N-Ras by large clostridial cytotoxins triggers up-regulation of the immediate early gene product RhoB
Creators: name: Hülsenbeck, Johannes
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2007
Subjects: subject: Large clostridial cytotoxins
subject: apoptosis
subject: Rho/Ras GTP-binding proteins
subject: Dewey Decimal Classification::500 | Naturwissenschaften::570 | Biowissenschaften, Biologie

description: [no abstract]
title: I Remember Myself
title: A Memoir
titleType: Subtitle
Creators: name: Clewett, Laura
Publisher: name: University of Kentucky Libraries
Year: 2019

description: “I Remember Myself” is a hybrid memoir told through poetry and prose. It tells the story of a young woman struggling to establish herself as an adult whose life is interrupted by chronic pain. The reader follows her relationships, along with her physical, mental, emotional and spiritual journeys through illness and grief. The work explores identity, the nature of the self, and the boundaries between reality and imagination.
description: Copyright © Laura Clewett 2019
Increasing plant defense mechanisms against herbivorous insects by tailored narrow-bandwidth supplementary light
Creators: name: Rechner, Ole
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Plant resistance
subject: light
subject: insects
subject: Pflanzenresistenz
subject: Licht
subject: Insekten
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Additional file 3 of The microbiota restrains neurodegenerative microglia in a model of amyotrophic lateral sclerosis
Creators: name: Cox, Laura M.
name: Calcagno, Narghes
name: Gauthier, Christian
name: Madore, Charlotte
name: Butovsky, Oleg
name: Weiner, Howard L.
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Neuroscience
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: 60506 Virology

description: Additional file 2: Supplemental Figure 2. Disease progression and microbiota changes in a second cohort of mice. A second cohort of SOD1 and WT mice were treated with antibiotics, cohoused, or did not receive treatment (H2O) n = 6 per group. Microglia were then sorted at day 120 of life. a) Neurologic scores were measured 3 times a week, and no difference between treatment groups was observed prior to day 120, which is similar to effects observed in the survival cohort (Fig. 1). b-d) Microbiota samples were collected at day 30 of life (baseline), then at days 37, 51, and 93. b) ADONIS test of microbiota samples from both the survival and microglia sort cohort indicates that treatment and timepoint have a substantial contribution to microbiome variation, whereas the contribution of cage and cohort is small, and genotype has no effect. *** p =0.001 c) Principal coordinates analysis of unweighted UniFrac distances show that samples cluster at baseline, and are shifted by antibiotic treatment, but not genotype or cohousing. d) Microbiota composition over time shows expansion of Ralstonia, Streptococcus, and Weisella, which is similar microbiota changes observed in the survival cohort (Fig. 2).
Industrial changes and multinational enterprises in Vietnam : the case of the Red River Delta
Creators: name: Nguyen, Thi Xuan Thu
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2017
Subjects: subject: Vietnam
subject: Red River Delta
subject: multinational enterprises
subject: regional development
subject: firm survival
subject: industrial concentration
subject: location choice
subject: backward linkages
subject: spillovereffects
subject: Delta des Roten Flusses
subject: multinationale Unternehmen
subject: regionale Entwicklung
subject: Fortbestehen von Unternehmen
subject: industrielle Konzentration
subject: Standortwahl
subject: Rückwärtsverflechtungen
subject: Spillover-Effekte
subject: Dewey Decimal Classification::300 | Sozialwissenschaften, Soziologie, Anthropologie::330 | Wirtschaft

description: [no abstract]
In-flight air supply system for PEM fuel cells
Creators: name: Barchewitz, Lukas
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2008
Subjects: subject: PEM fuel cell
subject: flight application
subject: air supply
subject: turbomachinery design
subject: design optimisation
subject: in-flight controls
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: [no abstract]
Additional file 4 of The microbiota restrains neurodegenerative microglia in a model of amyotrophic lateral sclerosis
Creators: name: Cox, Laura M.
name: Calcagno, Narghes
name: Gauthier, Christian
name: Madore, Charlotte
name: Butovsky, Oleg
name: Weiner, Howard L.
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Genetics
subject: Neuroscience
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer
subject: Science Policy
subject: 60506 Virology

description: Additional file 3: Supplemental Figure 3. The effect of genotype on microglia gene expression in untreated and antibiotic treated SOD1 and WT mice. a) Differential genes (SOD1 vs WT) in both untreated and antibiotic treated mice. DESeq FDR-adjusted q value < 0.2. b) The top 50 upregulated genes up-regulated and down-regulated in both treated and untreated mice. c) DESeq2 normalized levels of selected genes consistently down- or up-regulated by genotype. * p < 0.05, ** p < 0.01, *** p < 0.001.
Influence of fumaric acid supplementation on animal health, acid-base balance, ruminal fermentation and energy benefit of growing bulls and fistulated dairy cows
Creators: name: Remling, Nicole
Publisher: name: Hannover : Gottfried Wilhelm Leibniz Universität Hannover
Year: 2014
Subjects: subject: Fumaric acid
subject: ruminal fermentation
subject: acid-base balance
subject: Fumarsäure
subject: Pansenfermentation
subject: Säure-Base-Haushalt
subject: Dewey Decimal Classification::600 | Technik::630 | Landwirtschaft, Veterinärmedizin

description: [no abstract]
Coset intersection graphs for groups
Creators: name: Button, Jack
name: Chiodo, Maurice
name: Laris, Mariano Zeron-Medina
Publisher: name: arXiv
Year: 2013
Subjects: subject: Group Theory (math.GR)
subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 20E99

description: Let H, K be subgroups of G. We investigate the intersection properties of left and right cosets of these subgroups.
description: 4 pages