cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Antireflection nanostructures at material interfaces for enhancement of optical properties
Creators: name: Chen, Yi-An
Publisher: name: The University of Texas at Austin
Year: 2021
Subjects: Antireflection nanostructures
Nanostructures fabrication

description: Bioinspired nanomaterials and nanostructures have drawn increasing interest and attention because of their attractive optical, or mechanical properties. For example, nacre has a complex hierarchical architecture in both nanometer and micrometer scales, which leads to an excellent combination of stiffness, low weight, and energy dissipation. This nano-architecture have inspired researchers to create artificial nacre material for applications in protective armor. Another example is the antireflection nanostructures (AR) that can be used to mitigate light reflection from an optically polished surface. The surface reflection can be attributed to a refractive index mismatch at the air-solid interface, which causes Fresnel reflection losses and reduces transmission. We will further discuss detail about light interaction at material interfaces. Then, we will study design and fabrication process of interfacial nanostructures. Optical performance enhancement by applying interfacial nanostructures will be addressed
Faraday Cup design for Electrodeless Plasma Thrusters
Creators: name:  MARCO RICCARDO INCHINGOLO
name:   MARIO MERINO
name:   JAUME NAVARRO-CAVALLE
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: PLASMA
ELECTRIC PROPULSION
FARADAY CUP
DIAGNOSTICS

description: Faraday cups (FCs) are widely employed in electric propulsion to measure ion currents. In the case of electrodeless plasma thrusters, the typically lower ion energies and larger electron temperatures make it necessary to adopt additional care when designing and testing FCs. In this paper, the design of a FC is presented and the probe is used to scan the plume of a Helicon plasma thruster. A modular approach allows testing the effects of a set of design parameters on the collected ion current, namely two collimator types, the collector length, and collector material. Results show an ion current discrepancy of up to 50% between the probes equipped with the two collimators. However, no significant difference in the collected current is observed for the length and material studies, suggesting that secondary electrons generation or non-recollection are negligible in the ion energy and parametric range studied.
Study on buckling and critical temperatures of H-section steel columns under fire considering dynamic effect
Creators: name: Chen, Zhengrong
name: Yin, Zhongyuan
name: Wang, Liping
name: Jiang, Binhui
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: In this paper, the buckling and critical temperatures of H-section steel columns under fire were studied by parametric analysis. The finite element model of the steel column was verified by test data in literatures. The considered parameters include rotational restraint stiffness ratio (βR), axial restraint stiffness ratio (βl), and load ratio (ρN). Besides, the buckling and critical temperatures of steel columns under static analysis and explicit dynamic analysis were compared. It was found that the buckling temperatures obtained by these two analysis methods were almost the same, while the critical temperatures obtained by static analysis were slightly less than that obtained by explicit dynamic analysis, and the difference was within 30 ℃. The results of parametric analysis show that the buckling and critical temperatures increased with the increase of βR, and βR had greater influence on the critical temperature. In addition, with the increase of βl and ρN, the buckling and critical temperatures of the steel columns both decreased significantly. Finally, the buckling and critical temperatures obtained from the parametric analysis were compared with the existing calculation formulas. Results show that predictions of the existing formulas generally agree well with the analysis results.
Generalised Eisenhart lift of the Toda chain
Creators: name: Cariglia, Marco
name: Gibbons, Gary
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Toda chain of nearest neighbour interacting particles on a line can be described both in terms of geodesic motion on a manifold with one extra dimension, the Eisenhart lift, or in terms of geodesic motion in a symmetric space with several extra dimensions. We examine the relationship between these two realisations and discover that the symmetric space is a generalised, multi-particle Eisenhart lift of the original problem, that reduces to the standard Eisenhart lift. Such generalised Eisenhart lift acts as an inverse Kaluza-Klein reduction, promoting coupling constants to momenta in higher dimension. In particular, isometries of the generalised lift metric correspond to energy preserving transformations that mix coordinates and coupling constants. A by-product of the analysis is that the lift of the Toda Lax pair can be used to construct higher rank Killing tensors for both the standard and generalised lift metrics.
description: 8 pages, no figures
Experimental study on failure mechanism of top and seat with web angle connections under fire
Creators: name: Jiang, Jun
name: Jiang, Jian
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: As an important component in steel structures, beam-to-column connections may experience fracture at high temperatures, affecting progressive collapse resistance of steel structures. This paper experimentally investigates the failure mechanism of top and seat with web angle (TSWA) connections in the whole process of fire. The experimental results show that TSWA connections may fail is due to either fracture of lower angle bolt or fracture of angle plate around bolt hole. Loading during the heating-cooling stage has a great influence on the residual ultimate bearing capacity of connections after fire, and it is unsafe to ignore the influence of loading.
IMOTHEP_1st TECHNOLOGY WORKSHOP_11112020_PROSIB-project
Creators: name: Troiano, Giovanni
Publisher: name: Zenodo
Year: 2020
Subjects: IMOTHEP
IMOTHEPWS#1
green aviation
H2020 Transport
INEA
climate change
HEP

description: Presentation of PROSIB project at the IMOTHEP 1st TECHNOLOGY WORKSHOP carried out online on Nov, 11th, 2020.
Virtual Backbone Trees for Most Minimal Energy Consumption and Increasing Network Lifetime In WSNs
Creators: name: Saibharath, S.
name: Aarthi, J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences
subject: 68M10

description: Virtual backbone trees have been used for efficient communication between sink node and any other node in the deployed area. But all the proposed virtual backbone trees are not fully energy efficient and EVBTs have few flaws associated with them. In this paper two such virtual backbones are proposed. The motive behind the first algorithm, Most Minimal Energy Virtual Backbone Tree (MMEVBT), is to minimise the energy consumption when packets are transmitted between sink and a target sensor node. The energy consumption is most minimal and optimal and it is shown why it always has minimal energy consumption during any transfer of packet between every node with the sink node. For every node, route path with most minimal energy consumption is identified and a new tree node is elected only when a better minimal energy consumption route is identified for a node to communicate with the sink and vice versa. By moving sink periodically it is ensured the battery of the nodes near sink is not completely drained out. Another backbone construction algorithm is proposed which maximises the network lifetime by increasing the lifetime of all tree nodes. Simulations are done in NS2 to practically test the algorithms and the results are discussed in detail.
description: 10 pages, 4 figures, International Journal of Computer Networks & Communications (IJCNC) Vol.6, No.1, January 2014
An improved analytical formula for predicting the temperature of heavily protected steel sections
Creators: name: Possidente, Luca
name: Tondini, Nicola
name: Wickström, Ulf
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: Fire verification might be particularly demanding for steel structures and insulation is a common option to slow down the temperature increase in the steel elements without modifying the original structural design. Simple analytical formulae, as provided for instance in EN1993-1-2 design standard, allow a quick estimate of the temperature of insulated steelwork, without determining the thermal field inside a steel cross-section by performing in-depth experimental or numerical analyses. However, the EN1993-1-2 formulation considers heat transfer with temperature boundary conditions, rather than more realistic conditions on the heat flux, and is inaccurate for heavily insulated steel sections, in which protective solutions with high heat capacity are adopted. In this paper a new analytical formula aimed at estimating the temperature of protected steel members is proposed. Its accuracy is assessed by comparing the predictions of the proposed and the EN1993-1-2 formulations with the results of a parametric analysis consisting of 1-D models. Several steel thicknesses, insulation materials and thicknesses and an exposure to the ISO 834 heating curve are considered in the analyses. It is shown that the EN1993-1-2 can be both conservative and unconservative depending on the ratio between the insulation and the steel heat capacities 𝜇 and is not suited for heavily insulated steel sections with high values of 𝜇. On the contrary, the proposed formulation results in being always safe and particularly suited for heavily insulated steel sections.
Interactive System Modeling for Designing a New Concept Launch Vehicle
Creators: name:  MASASHI MIURA
name:   YUKI SAKAMOTO
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: SYSTEM MODEL
SYSTEM DESIGN
MODELING

description: Interactive System Modeling is a process in which participants interact and collaborate to build system models. Using this method, stakeholders and project members can obtain common understandings and a consensus for the system effectively. This paper introduces the concept of interactive system modeling and the specialized tools for this purpose. The paper also presents an example of upstream design of a new concept launch vehicle using this method.
Dirac observables and boundary proposals in quantum cosmology
Creators: name: Jalalzadeh, S.
name: Moniz, P. V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the reduced phase space quantization of a closed Friedmann Universe, where matter content is constituted by two (no-interacting) fluids, namely dust (or cold dark matter) and radiation. It is shown that, for this particular model, specific boundary conditions can be related to the algebra of Dirac observables.
description: 6 pages, no figures, to appear in Phys. Rev. D
Cosmological Constraints on Ghost Dark Energy in the Brans-Dicke Theory by Using MCMC Approach
Creators: name: Alavirad, Hamzeh
name: Sheykhi, Ahmad
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: By using a Markov Chain Monte Carlo simulation, we investigate cosmological constraints on the ghost dark energy (GDE) model in the framework of the Brans-Dicke (BD) theory. A combination of the latest observational data of the cosmic microwave background radiation data from seven-year WMAP, the baryon acoustic oscillation data form the SDSS, the supernovae type Ia data from the Union2 and the X-ray gas mass fraction data from the Chandra X-ray observations of the largest relaxed galaxy clusters are used to perform constraints on GDE in the BD cosmology. In this paper, we consider both flat and non-flat universes together with interaction between dark matter and dark energy. The main cosmological parameters are obtained as: $Ω_{\rm b}h^2= 0.0223^{+0.0016}_{-0.0013}$, $Ω_{\rm c}h^2=0.1149^{+0.0088}_{-0.0104}$ and $Ω_{\rm k}=0.0005^{+0.0025}_{-0.0073}$. In addition, the Brans-Dicke parameter $ω$ is estimated as $1/ω\simeq 0.002$.
description: 13 pages, 3 figures, 1 table, Accepted in Phys. Lett. B
Diffusion of finite-size particles in channels with random walls
Creators: name: Bauer, Max
name: Godec, Aljaz
name: Metzler, Ralf
Publisher: name: arXiv
Year: 2013
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Biological Physics (physics.bio-ph)
subject: FOS: Physical sciences

description: Diffusion of chemicals or tracer molecules through complex systems containing irregularly shaped channels is important in many applications. Most theoretical studies based on the famed Fick-Jacobs equation focus on the idealised case of infinitely small particles and reflecting boundaries. In this study we use numerical simulations to consider the transport of finite-sized particles through asymmetrical two-dimensional channels. Additionally, we examine transient binding of the molecules to the channel walls by applying sticky boundary conditions. With the application of diffusing pathogens in hydrogels in mind, we consider an ensemble of particles diffusing in independent channels, which are characterised by common structural parameters. We compare our results for the long-time effective diffusion coefficient with a recent theoretical formula obtained by Dagdug and Pineda [J. Chem. Phys., 2012, 137, 024107].
description: 10 pages, 12 figures, RevTeX
SND metadata profile: Language Resources
Creators: name: Swedish National Data Service
Publisher: name: Zenodo
Year: 2023
Subjects: metadata
metadata profile
SND metadata profile
SND
Swedish National Data Service

description: To make it easier for researchers from various fields to describe and share data, SND has developed several metadata profiles that are specific for certain fields, or topics. SND also offers a general profile to fit broader uses, and a profile for entry level data; a minimum metadata profile that fulfils the DataCite requirements to issue a DOI for a dataset.

The Language resources profile also includes support for documenting resource and media types according to the META-SHARE metadata model: http://www.meta-share.org/p/93/Documentation#mode
description: Funded by the Swedish Research Council.
Assessment of structural steel members temperatures in open car park fires: different modelling approaches
Creators: name: Yan, Xia
name: Charlier, Marion
name: Gernay, Thomas
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: Open car parks, as defined based on ventilation conditions, are one of the most common types of car park buildings. For such structures, adopting a performance-based structural fire design based on localised fires is often justified and allowed because the fire does not reach flashover. As this approach requires assessing the temperatures in the structure, this paper focuses on the numerical analysis of the temperatures reached in open car park steel beams under localised fires through different approaches. Simple analytical localised fire models and advanced CFD-FEM coupling methods are used to evaluate the beam temperatures. Several parameters are considered and varied: the dimensions of the steel elements, layout of burning vehicles, galvanization of the steel, and the modelling approaches. Results show that the temperatures reached in the investigated steel profiles are influenced by the location and number of burning vehicles; open car park fires generate thermal exposure conditions vastly different from the nominal fires. Galvanization of the steel profiles has the effect of delayed heating and reduced peak temperature under open car park fires. In terms of the modelling approach, Hasemi model is overconservative and gives erroneous results with galvanization, while adopting an advanced CFD-FEM modelling approach shows advantages and benefits for the performance-based design of open car parks in fire conditions.
SND metadata profile: Language Resources
Creators: name: Swedish National Data Service
Publisher: name: Zenodo
Year: 2022
Subjects: metadata
metadata profile
SND metadata profile
SND
Swedish National Data Service

description: To make it easier for researchers from various fields to describe and share data, SND has developed several metadata profiles that are specific for certain fields, or topics. SND also offers a general profile to fit broader uses, and a profile for entry level data; a minimum metadata profile that fulfils the DataCite requirements to issue a DOI for a dataset. The Language resources profile also includes support for documenting resource and media types according to the META-SHARE metadata model: http://www.meta-share.org/p/93/Documentation#model A new version of this document is in progress.
description: Funded by the Swedish Research Council.
Automated Code Generation for Lattice Quantum Chromodynamics and beyond
Creators: name: Barthou, Denis
name: Brand-Foissac, Olivier
name: Dolbeau, Romain
name: Grosdidier, Gilbert
name: Eisenbeis, Christina
name: Kruse, Michael
name: Pene, Olivier
name: Petrov, Konstantin
name: Tadonki, Claude
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Programming Languages (cs.PL)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We present here our ongoing work on a Domain Specific Language which aims to simplify Monte-Carlo simulations and measurements in the domain of Lattice Quantum Chromodynamics. The tool-chain, called Qiral, is used to produce high-performance OpenMP C code from LaTeX sources. We discuss conceptual issues and details of implementation and optimization. The comparison of the performance of the generated code to the well-established simulation software is also made.
Transonic flow oscillations in cavity/store problems
Creators: name:  NICHOLAS F GIANNELIS
name:   GARETH A VIO
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: AEROACOUSTICS
CAVITY FLOW
COMPRESSIBLE FLOW

description: This paper presents a comparative assessment of the aeroacoustic environment and associated flow features induced by the introduction of a rigid store to a simple cavity at transonic freestream conditions. Wall-Modelled Large Eddy Simulation has been employed to capture the complex flow features and instability mechanisms associated with high-speed open cavity flows. For both the empty and with-store configurations, excellent correlation to the experiments in terms of spectral character and resonant frequencies was found. Reasonable correlation was also found in the predicted Sound Pressure Levels at the cavity tones, however the simulations tend to underestimate the peak acoustic loading, typically on the order of 2 -3%. Assessing the influence of the store on the underlying flow dynamics, mode-switching behaviour was identified, wherein the dominant cavity tone shifts from the first to second mode with the store installed. Fluidic modal analysis via Dynamic Mode Decomposition reveals this behaviour likely stems from bifurcation in the spatial structures of the pressure eigenvectors associated with these modes.
Formalizing MultiWords as Catenae in a Treebank and in a Lexicon
Creators: name: Simov, Kiril
name: Osenova, Petya
Publisher: name: University of Tübingen
Year: 2014

description: The paper presents formalization of multiwords as catenae in a treebank and in a lexicon. We view catenae as a dependency subtree, which reflects non-constituents and non-standard dependencies. Since the multiword classifications vary to great extent, starting from very narrow ones and proliferating to extended ones which include also valences, the focus in the paper is not on the multiword typology per se, but on the general formalization of multi-words.
Effects of cladding materials on the fire resistance of external light gauge steel framed walls exposed to internal fire
Creators: name: Pancheti, Jashnav
name: Mahendran, Mahen
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: This paper presents finite element heat transfer modelling of external light gauge steel framed (LSF) walls with autoclaved aerated concrete and brick veneer cladding exposed to fire from the inside. There has been research on the fire resistance of internal LSF walls (gypsum plasterboard layers on both sides of the cold-formed steel (CFS) studs) [1,2] and fire resistance of external LSF walls (gypsum plasterboard on the internal side and any cladding on the external side) exposed to fire from the external side [3–5]. But no research is available on the fire resistance of external LSF walls exposed to fire from the internal side and whether the cladding has any influence on the fire resistance of these LSF walls. Finite element heat transfer models were first validated against the fire test results presented in Refs. [3,5]. They were then used to evaluate the fire resistance of these LSF walls exposed to fire from the internal side. Two configurations with and without cavity insulation, when exposed to fire from the internal side, were investigated. When compared to internal LSF walls, while minor differences were noticed in the case of cavity insulated walls, a significant difference was observed when there was no cavity insulation in the wall.
Equation of state for neutron stars: Hyperon mixing in SU(3) flavor symmetry
Creators: name: Miyatsu, Tsuyoshi
name: Cheoun, Myung-Ki
name: Saito, Koichi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Using various kinds of relativistic mean-field models as well as the quark-meson coupling model, we study in detail the properties of neutron stars. We find that the equation of state in SU(3) flavor symmetry can support a neutron star with mass of $(1.8 \sim 2.1) M_{\odot}$ even if hyperons exist inside the core of a neutron star.
description: 4 pages, 4 figures, 2 table, accepted to the proceedings of the 12th Asia Pacific Physics Conference (APPC12) in JPS Conference Proceedings
Living with the Wrong Sign
Creators: name: Cooper, Patrick
name: Dubovsky, Sergei
name: Mohsen, Ali
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We describe a UV complete asymptotically fragile Lorentz-invariant theory exhibiting superluminal signal propagation. Its low energy effective action contains "wrong" sign higher dimensional operators. Nevertheless, the theory gives rise to an S-matrix, which is defined at all energies. As expected for a non-local theory, the corresponding scattering amplitudes are not exponentially bounded on the physical sheet, but otherwise are healthy. We study some of the physical consequences of this S-matrix.
Material characterization tests and advanced modeling of high- and ultra-high-strength steels under natural fire conditions
Creators: name: Uszball, Sara
name: Knobloch, Markus
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: For mild steels it has been proven by experimental evidence that the mechanical material behaviour is reversible in the cooling phase of natural fire scenarios. Regarding the material behaviour of high-strength steels during cooling there are no results available in literature so far. Therefore, the application range of existing code models, such as the Eurocode material model, remain restricted for fire scenarios with steadily increasing temperatures and to steel grades up to S500 in the cooling phase of natural fires. The paper provides the first test program regarding the constitutive material behaviour of high- and ultra-high-strength steels of grades S690QL and S960QL as well as mild steel S355 J2+N in the case of natural fires. It is elaborated that the mechanical material behaviour of high-strength steels in the cooling phase differs from the behaviour in the heating phase and is not reversible due to phase changes of the microstructure. A constitutive material model for future extensions of the 2nd generation of the Eurocode to high-strength steels under natural fire conditions is developed on the basis of experimental data of natural fire and residual strength tests; and the numerical implementation of the temperature-dependent material behaviour in the finite-elemente software Abaqus/Standard is described.
Design, fabrication and characterization of electrically controlled solid microthruster
Creators: name:  WEI ZHANG
name:   HAIMING XIE
name:   ZHIWEN WANG LIRONG BAO
name:   RUIQI SHEN
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: ELECTRICALLY CONTROLLED SOLID MICROTHRUSTER
CONTROLLABLE IGNITION AND EXTINGUISHMENT
THRUST TEST
MULTIPLE IGNITION AND EXTINGUISHMENT

description: In the current research, the formula of the electrically controlled solid propellant (ECSP) composed of oxidizer, adhesive, crosslinking agent, and other functional additives was determined, and the laboratory preparation process of the propellant was proposed. The electrically controlled solid microthruster was designed and assembled, and the combustion test system of the microthruster was built. The ignition delay time, energy required for ignition, mass loss, extinguishment delay time and thrust were taken as the performance indicators of the microthruster, and the influences of Al content on the microthruster under different loading voltages were studied. The results show that when the content of Al is too low, the ignition cannot be ignited at 150V, and the combustion performance is unstable.
Herschel SPIRE FTS Spectral Mapping Calibration
Creators: name: Benielli, Dominique
name: Polehampton, Edward
name: Hopwood, Rosalind
name: Marín, Ana Belén Griñón
name: Fulton, Trevor
name: Imhof, Peter
name: Lim, Tanya
name: Lu, Nanyao
name: Makiwa, Gibion
name: Marchili, Nicola
name: Naylor, David
name: Spencer, Locke
name: Swinyard, Bruce
name: Valtchanov, Ivan
name: van der Wiel, Matthijs
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The Herschel SPIRE Fourier transform spectrometer (FTS) performs spectral imaging in the 447-1546 GHz band. It can observe in three spatial sampling modes: sparse mode, with a single pointing on sky, or intermediate or full modes with 1 and 1/2 beam spacing, respectively. In this paper, we investigate the uncertainty and repeatability for fully sampled FTS mapping observations. The repeatability is characterised using nine observations of the Orion Bar. Metrics are derived based on the ratio of the measured intensity in each observation compared to that in the combined spectral cube from all observations. The mean relative deviation is determined to be within 2%, and the pixel-by-pixel scatter is ~7%. The scatter increases towards the edges of the maps. The uncertainty in the frequency scale is also studied, and the spread in the line centre velocity across the maps is found to be ~15 km/s. Other causes of uncertainty are also discussed including the effect of pointing and the additive uncertainty in the continuum.
description: 12 pages, 9 figures, accepted for publication in Experimental Astronomy
AJP Heart and Circ - HFpEF Sympatholysis - online supplement
Creators: name: Alpenglow, Jeremy
Publisher: name: figshare
Year: 2023
Subjects: classificationCode: 320899
subject: Medical physiology not elsewhere classified

description: Methods section for the manuscript "Evidence of Impaired Functional Sympatholysis in Patients with Heart Failure with Preserved Ejection Fraction"
A Herschel and BIMA study of the sequential star formation near the W48A HII region
Creators: name: Rygl, K. L. J.
name: Goedhart, S.
name: Polychroni, D.
name: Wyrowski, F.
name: Motte, F.
name: Elia, D.
name: Nguyen-Luong, Q.
name: Didelon, P.
name: Pestalozzi, M.
name: Benedettini, M.
name: Molinari, S.
name: Andre, Ph.
name: Fallscheer, C.
name: Gibb, A.
name: di Giorgio, A. M.
name: Hill, T.
name: Konyves, V.
name: Marston, A.
name: Pezzuto, S.
name: Rivera-Ingraham, A.
name: Schisano, E.
name: Schneider, N.
name: Spinoglio, L.
name: Ward-Thompson, D.
name: White, G. J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the results of Herschel HOBYS photometric mapping combined with BIMA observations and additional archival data, and perform an in-depth study of the evolutionary phases of the star-forming clumps in W 48A and their surroundings. Age estimates for the compact sources were derived from bolometric luminosities and envelope masses, which were obtained from the dust continuum emission, and agree within an order of magnitude with age estimates from molecular line and radio data. The clumps in W 48A are linearly aligned by age (east-old to west-young): we find a ultra compact (UC) HII region, a young stellar object (YSO) with class II methanol maser emission, a YSO with a massive outflow, and finally the NH_2D prestellar cores from Pillai et al. This remarkable positioning reflects the (star) formation history of the region. We find that it is unlikely that the star formation in the W 48A molecular cloud was triggered by the UCHII region and discuss the Aquila supershell expansion as a mayor influence on the evolution of W 48A. We conclude that the combination of Herschel continuum data with interferometric molecular line and radio continuum data is important to derive trustworthy age estimates and interpret the origin of large scale structures through kinematic information.
description: Accepted for publication in MNRAS, 22 pages, 21 figures, 5 tables
IMOTHEP_1st TECHNOLOGY WORKSHOP_11112020_NOVAIR-project
Creators: name: Prof. Veldhuis, L.L.M.
Publisher: name: Zenodo
Year: 2020
Subjects: IMOTHEP
IMOTHEPWS#1
green aviation
H2020 Transport
INEA
climate change
HEP

description: Presentation of NOVAIR project at the IMOTHEP 1st TECHNOLOGY WORKSHOP carried out online on Nov, 11th, 2020.
Fire performance of built-up cold-formed steel columns
Creators: name: Craveiro, Hélder D.
name: Rahnavard, Rohola
name: Laím, Luís
name: Satntiago, Aldina
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: Cold-formed steel (CFS) products are nowadays widely used in multiple structural applications, exploring their versatility. More recently CFS products and structural solutions have been used successfully in multi-storey buildings, enabling prefabrication, and easy and fast assembly procedures. To further extend the applicability of such products in new structures, their versatility must be intelligently explored, for instance by combining multiple individual sections effectively to attain higher load-bearing capacity and torsional stiffness. The behaviour of built-up elements has been investigated worldwide in order the address the demands arising from the construction sector about the urgent need for specific guidelines for the design of built-up elements. However, under accidental fire conditions, research on the behaviour of CFS built-up elements is still scarce, and no specific provisions exist for these types of structural elements. In this investigation, the fire performance of short built-up cold-formed steel columns is assessed using experimental tests and numerical modelling. Closed built-up cross-sections were investigated in fire using 3 basic cross-section shapes, namely C, U and Σ. The composite action between the individual shapes and local buckling phenomena was investigated, considering the influence of fastener spacing in the overall behaviour of the short built-up columns in fire
Estimation of Hard Start Mechanism by Visualization Test of Hypergolic Bipropellant Thruster
Creators: name:  KOHJI TOMINAGA
name:   YU DAIMON
name:   GO FUJII
name:   TAIICHI NAGATA
name:   YOSHIKI MATSUURA
name:   YASUHITO KANO
name:   ERIKA UCHIYAMA
Publisher: name: Proceedings of the Aerospace Europe Conference - EUCASS - CEAS - 2023
Year: 2023
Subjects: HARD START
DETONATION
HYPERGOLIC BIPROPELLANT THRUSTER
VISUALIZATION TEST

description: The process of hard-start generation, an unstable starting mode for bipropellant thrusters, was estimated through a visualized firing test using a thruster with a visualized combustion chamber. It was clarified that combustion chamber pressure and hard start are strongly linked. Flash boiling of the oxidizer in a vacuum environment causes a prolonged ignition delay. Ignition occurs when the combustion chamber pressure rises above the oxidizer vapor pressure due to the reaction gas. At that time, unburned fuel accumulates in the combustion chamber, causing detonation with high intensity and high propagation velocity immediately after ignition.
Room temperature single-photon detectors for high bit rate quantum key distribution
Creators: name: Comandar, L. C.
name: Fröhlich, B.
name: Lucamarini, M.
name: Patel, K. A.
name: Sharpe, A. W.
name: Dynes, J. F.
name: Yuan, Z. L.
name: Penty, R. V.
name: Shields, A. J.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report room temperature operation of telecom wavelength single-photon detectors for high bit rate quantum key distribution (QKD). Room temperature operation is achieved using InGaAs avalanche photodiodes integrated with electronics based on the self-differencing technique that increases avalanche discrimination sensitivity. Despite using room temperature detectors, we demonstrate QKD with record secure bit rates over a range of fiber lengths (e.g. 1.26 Mbit/s over 50 km). Furthermore, our results indicate that operating the detectors at room temperature increases the secure bit rate for short distances.
description: 14 pages, 4 figures
Fire resistance of short steel columns protected with developed gypsum-based mortars
Creators: name: Caetano, Hugo
name: Santiago, Aldina
name: Laím, Luís
name: Shahbazian, Ashkan
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: During a fire event, the stability of steel members may be compromised, and the structural collapse may occur, due to the loss of its mechanical resistance as the temperature increase. One of the solutions to reduce this problem is the protection with a coating using enhanced fire-resistant mortars. In this sense, the main objective of this experimental work was to develop a gypsum mortar as a passive fire protection for steel members and to compare the mechanical behaviour of steel columns subject to axial compression and high temperatures when protected with: i) the developed gypsum mortar, ii) a commercial mortar and iii) without any kind of thermal protection. In addition, the thermal effect provided by the respective mortars with a coating of 2 and 3 cm on the steel columns was also studied. The results showed that when compared with the non-protected steel column, 2 cm of commercial mortar and laboratory developed mortar increased the fire resistance of the column by about 4.5 and 5.8 times more, respectively. When a 3 cm thick coating was applied, the commercial mortar and the laboratory developed mortar increased their fire resistance by about 7.4 and 8.0 times more, respectively. These results demonstrated the actual impact of the application of such mortars as passive fire protection of steels structures.
Finding Parse Errors in the Midst of Parse Errors
Creators: name: Dickinson, Markus
name: Smith, Amber
Publisher: name: University of Tübingen
Year: 2014

description: We consider a simple method for dependency parse error detection and develop representations which account for parse errors occurring in the context of other parse errors. The core insight is to combine both very detailed representations with more relaxed representations, i.e., ones which allow for errors. We show that for situations with little annotated data to begin with, error detection precision can be greatly increased.
Active plasma resonance spectroscopy: Eigenfunction solutions in spherical geometry
Creators: name: Oberrath, Jens
name: Brinkmann, Ralf Peter
Publisher: name: arXiv
Year: 2014
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: The term Active Plasma Resonance Spectroscopy (APRS) denotes a class of related techniques which utilize, for diagnostic purposes, the natural ability of plasmas to resonate on or near the electron plasma frequency: A radio frequent signal (in the GHz range) is coupled into the plasma via an antenna or probe, the spectral response is recorded, and a mathematical model is used to determine plasma parameters like the electron density or the electron temperature. Based on the cold plasma model, this manuscript provides the general analytic expression of the electrical admittance of a spherical shaped probe immersed into a plasma. It is derived from the matrix representation of an appropriate operator, which describes the dynamical behavior of the probe-plasma system. This dynamical operator can be split into a conservative operator and a dissipative operator. It can be shown that the eigenvalues of the conservative operator represent the resonance frequencies of the probe-plasma system which are simply connected to the electron density. As an example, the result is applied to the spherical impedance probe and the multipole resonance probe.
SND metadata profile: Medical and Health Sciences
Creators: name: Swedish National Data Service
Publisher: name: Zenodo
Year: 2022
Subjects: metadata
metadata profile
SND metadata profile
SND
Swedish National Data Service

description: To make it easier for researchers from various fields to describe and share data, SND has developed several metadata profiles that are specific for certain fields, or topics. SND also offers a general profile to fit broader uses, and a profile for entry level data; a minimum metadata profile that fulfils the DataCite requirements to issue a DOI for a dataset.
description: Funded by the Swedish Research Council.
On tidal forces in f(R) theories of gravity
Creators: name: de la Cruz-Dombriz, Alvaro
name: Dunsby, Peter K. S.
name: Busti, Vinicius C.
name: Kandhai, Sulona
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Despite the extraordinary attention that modified gravity theories have attracted over the past decade, the geodesic deviation equation in this context has not received proper formulation thus far. This equation provides an elegant way to investigate the timelike, null and spacelike structure of spacetime geometries. In this investigation we provide the full derivation of this equation in situations where General Relativity has been extended in Robertson-Walker background spacetimes. We find that for null geodesics the contribution arising from the geometrical new terms is in general non-zero. Finally we apply the results to a well known class of f(R) theories, compare the results with General Relativity predictions and obtain the equivalent area distance relation.
description: 9 pages, 2 figures
Order parameter profiles in presence of topological defect lines
Creators: name: Delfino, Gesualdo
Publisher: name: arXiv
Year: 2014
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider the broken phase of the n-vector model in n+1 dimensions with boundary conditions enforcing the presence of topological defect lines (Ising domain walls, XY vortex lines, and so on), and use field theory to argue an exact expression for the order parameter.
description: 5 pages, 1 figure
SND metadata profile: Medical and Health Sciences
Creators: name: Swedish National Data Service
Publisher: name: Zenodo
Year: 2023
Subjects: metadata
metadata profile
SND metadata profile
SND
Swedish National Data Service

description: To make it easier for researchers from various fields to describe and share data, SND has developed several metadata profiles that are specific for certain fields, or topics. SND also offers a general profile to fit broader uses, and a profile for entry level data; a minimum metadata profile that fulfils the DataCite requirements to issue a DOI for a dataset.
description: Funded by the Swedish Research Council.
Occupation probabilities from quadrupole moments in the Sn region
Creators: name: de Takacsy, N. B.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: It is shown that a simple BCS model with a quadrupole-quadrupole interaction provides a consistent description of the measured quadrupole moments of a sequence of odd-mass Sn and Cd isotopes and allows the extraction of the neutron single-particle occupation probabilities.
description: 7 pages, 2 figures
SND metadata profile: Medical and Health Sciences
Creators: name: Swedish National Data Service
Publisher: name: Zenodo
Year: 2022
Subjects: metadata
metadata profile
SND metadata profile
SND
Swedish National Data Service

description: To make it easier for researchers from various fields to describe and share data, SND has developed several metadata profiles that are specific for certain fields, or topics. SND also offers a general profile to fit broader uses, and a profile for entry level data; a minimum metadata profile that fulfils the DataCite requirements to issue a DOI for a dataset. A new version of this document is in progress.
description: Funded by the Swedish Research Council.
Oxygen diffusion and reactivity at low temperature on bare amorphous olivine-type silicate
Creators: name: Minissale, M.
name: Congiu, E.
name: Dulieu, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences
subject: 85-05

description: The mobility of O atoms at very low temperatures is not generally taken into account, despite O diffusion would add to a series of processes leading to the observed rich molecular diversity in space. We present a study of the mobility and reactivity of O atoms on an amorphous silicate surface. Our results are in the form of RAIRS and temperature-programmed desorption spectra of O2 and O3 produced via two pathways: O + O and O2 + O, investigated in a submonolayer regime and in the range of temperature between 6.5 and 30 K. All the experiments show that ozone is formed efficiently on silicate at any surface temperature between 6.5 and 30 K. The derived upper limit for the activation barriers of O + O and O2 + O reactions is 150 K/kb. Ozone formation at low temperatures indicates that fast diffusion of O atoms is at play even at 6.5 K. Through a series of rate equations included in our model, we also address the reaction mechanisms and show that neither the Eley Rideal nor the Hot atom mechanisms alone can explain the experimental values. The rate of diffusion of O atoms, based on modeling results, is much higher than the one generally expected, and the diffusive process proceeds via the Langmuir-Hinshelwood mechanism enhanced by tunnelling. In fact, quantum effects turn out to be a key factor that cannot be neglected in our simulations. Astrophysically, efficient O3 formation on interstellar dust grains would imply the presence of huge reservoirs of oxygen atoms. Since O3 is a reservoir of elementary oxygen, and also of OH via its hydrogenation, it could explain the observed concomitance of CO2 and H2O in the ices.
description: 28 pages, 14 figures
Performance of vertical load carrying beam to column subassemblages in seismic resisting steel framed buildings under fully developed fire
Creators: name: Meng, Fanqin
name: Abu, Anthony
name: Clifton, G Charles
Publisher: name: figshare
Year: 2023
Subjects: Fire safety engineering
Structural engineering

description: Steel-framed buildings, comprising a structural steel frame supporting composite concrete floors, are commonly used in highly seismically active areas. However, predominant design guidelines are obtained from studies on isolated structural components and disregard the interaction of structural components during a fire. Thus, this paper uses a validated numerical modelling method in ABAQUS to analyze the performance of beam-to-steel column assemblage with composite slabs in fires. The simulation results reveal that the interior columns in the structural assemblage may fail to research the designed fire resistance because the continuous bending beams squeeze the column from two orientations. Although the recommended continuity stiffeners enhance column performance in the structural assemblage, the structural assemblage presents limited reserve fire resistance. Thus, new reduction factors, SQRT, are proposed herein to provide a reasonable robustness margin for steel columns to resist a fire severer than the designed FRR. The simulation results show that using SQRT reduction factors generates a reserve fire resistance ratio of 1.30 for steel columns, which is more appropriate compared with the 1.14 using the ones from EN 1993-1-2.
ЎЗБЕКИСТОНДА ОЛИЙ ТАЪЛИМ СОҲАСИДАГИ АКАДЕМИК ЭРКИНЛИКНИ ТАЪМИНЛАШНИНГ ЎЗИГА ХОС ЖИҲАТЛАРИ
Creators: name: Элмуродов, Элдоржон
Publisher: name: Zenodo
Year: 2023

description: Олий таълим соҳасидаги академик эркинликни таъминлаш таълим ва тадқиқотдаги тараққиётнинг асосий гарови ҳисобланади. Академик эркинлик масаласи олий таълим муассасаларининг ўзини ўзи бошқариш ва молиявий мустақиллик тамойиллари билан узвий боғлиқ.
Specific heat of K071Na0.29Fe2As2 at very low temperatures
Creators: name: Reifenberger, A.
name: Hempel, M.
name: Vogt, P.
name: Aswartham, S.
name: Abdel-Hafiez, M.
name: Grinenko, V.
name: Wurmehl, S.
name: Drechsler, S. -L.
name: Fleischmann, A.
name: Enss, C.
name: Klingeler, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: A commercially available calorimeter has been used to investigate the specific heat of a high-quality \kn\ single crystal. The addenda heat capacity of the calorimeter is determined in the temperature range $0.02 \, \mathrm{K} \leq T \leq 0.54 \, \mathrm{K}$. The data of the \kn\ crystal imply the presence of a large $T^2$ contribution to the specific heat which gives evidence of $d$-wave order parameter symmetry in the superconducting state. To improve the measurements, a novel design for a calorimeter with a paramagnetic temperature sensor is presented. It promises a temperature resolution of $ΔT \approx 0.1 \, \mathrm{μK}$ and an addenda heat capacity less than $200 \, \mathrm{pJ/K}$ at $ T < 100 \, \mathrm{mK}$.
description: 8 pages, 5 figures