cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Towards Distributed Convoy Pattern Mining
Creators: name: Orakzai, Faisal
name: Devogele, Thomas
name: Calders, Toon
Publisher: name: arXiv
Year: 2015
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Mining movement data to reveal interesting behavioral patterns has gained attention in recent years. One such pattern is the convoy pattern which consists of at least m objects moving together for at least k consecutive time instants where m and k are user-defined parameters. Existing algorithms for detecting convoy patterns, however do not scale to real-life dataset sizes. Therefore a distributed algorithm for convoy mining is inevitable. In this paper, we discuss the problem of convoy mining and analyze different data partitioning strategies to pave the way for a generic distributed convoy pattern mining algorithm.
description: SIGSPATIAL'15 November 03-06, 2015, Bellevue, WA, USA
Relativistic Artificial Molecules Realized by Two Coupled Graphene Quantum Dots
Creators: name: Fu, Zhong-Qiu
name: Pan, Yue-Ting
name: Zhou, Jiao-Jiao
name: Ma, Dong-Lin
name: Zhang, Yu
name: Qiao, Jia-Bin
name: Liu, Haiwen
name: Jiang, Hua
name: He, Lin
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Coupled quantum dots (QDs), usually referred to as artificial molecules, are important not only in exploring fundamental physics of coupled quantum objects, but also in realizing advanced QD devices. However, previous studies have been limited to artificial molecules with nonrelativistic fermions. Here, we show that relativistic artificial molecules can be realized when two circular graphene QDs are coupled to each other. Using scanning tunneling microscopy (STM) and spectroscopy (STS), we observe the formation of bonding and antibonding states of the relativistic artificial molecule and directly visualize these states of the two coupled graphene QDs. The formation of the relativistic molecular states strongly alters distributions of massless Dirac fermions confined in the graphene QDs. Because of the relativistic nature of the molecular states, our experiment demonstrates that the degeneracy of different angular-momentum states in the relativistic artificial molecule can be further lifted by external magnetic fields. Then, both the bonding and antibonding states are split into two peaks.
Enhancement of Thermal Spin Transfer Torque via Bandpass Energy Filtering
Creators: name: Priyadarshi, Pankaj
name: Sharma, Abhishek
name: Muralidharan, Bhaskaran
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We propose the use of energy bandpass filtering approach in the magnetic tunnel junction device as a route to enhance the thermal spin transfer torque. Using the spin-resolved non-equilibrium Green's function formalism, we harness the optical analog of anti-reflective coating in a heterostructure MTJ device, that reports a huge spin torque in the linear regime of temperature bias. In particular, we discuss the position of transmission function with respect to the Fermi energy that caters the maximum thermal effect. The boxcar transmission feature of anti-reflective configuration enhances the charge and spin transport through the structure in comparison to the normal superlattice configurations. The thermally excited spin transfer torque is enhanced by almost five times more with our device design. Although, the thermally driven spin torque is much smaller than the potential driven torque, this technique provides an energy-efficient way to switch the magnetization. This opens up a new viable area in the spintronics applications. With the existing advanced thin-film growth technology, the optimized superlattice configurations can be achieved.
Spectral determinant for the damped wave equation on an interval
Creators: name: Freitas, Pedro
name: Lipovský, Jiří
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We evaluate the spectral determinant for the damped wave equation on an interval of length $T$ with Dirichlet boundary conditions, proving that it does not depend on the damping. This is achieved by analysing the square of the damped wave operator using the general result by Burghelea, Friedlander, and Kappeler on the determinant for a differential operator with matrix coefficients.
description: 11 pages
CEDA and JASMIN Services
Creators: name: Williamson, E
Publisher: name: Zenodo
Year: 2018
Subjects: subject: ecology and environment
subject: https://id.loc.gov/authorities/subjects/sh85040468.html
subject: https://id.loc.gov/authorities/subjects/sh85084334.html

description: The Centre for Environmental Data Analysis (CEDA) is based at the STFC Rutherford Appleton Laboratory. CEDA operates 4 environmental data centres, offers data analysis environments (JASMIN), and professional data management services for the UK academic community to ensure the availability of stored data for the future.
description: Previously curated at: http://cedadocs.ceda.ac.uk/1442/ The publish date on this item was its original published date. This item was previously associated with content (as an official url) at: https://www.neodc.rl.ac.uk. This work was funded by: NERC. Main files in this record: CEDA and JASMIN Services poster.pdf Ed_Williamson_poster_NCEO_2017.pptx Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Miss Hayley Gray. Transferred to CEDA document repository community on Zenodo on 2022-11-24
A Blind Multiscale Spatial Regularization Framework for Kernel-based Spectral Unmixing
Creators: name: Borsoi, Ricardo Augusto
name: Imbiriba, Tales
name: Bermudez, José Carlos Moreira
name: Richard, Cédric
Publisher: name: arXiv
Year: 2019
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Introducing spatial prior information in hyperspectral imaging (HSI) analysis has led to an overall improvement of the performance of many HSI methods applied for denoising, classification, and unmixing. Extending such methodologies to nonlinear settings is not always straightforward, specially for unmixing problems where the consideration of spatial relationships between neighboring pixels might comprise intricate interactions between their fractional abundances and nonlinear contributions. In this paper, we consider a multiscale regularization strategy for nonlinear spectral unmixing with kernels. The proposed methodology splits the unmixing problem into two sub-problems at two different spatial scales: a coarse scale containing low-dimensional structures, and the original fine scale. The coarse spatial domain is defined using superpixels that result from a multiscale transformation. Spectral unmixing is then formulated as the solution of quadratically constrained optimization problems, which are solved efficiently by exploring their strong duality and a reformulation of their dual cost functions in the form of root-finding problems. Furthermore, we employ a theory-based statistical framework to devise a consistent strategy to estimate all required parameters, including both the regularization parameters of the algorithm and the number of superpixels of the transformation, resulting in a truly blind (from the parameters setting perspective) unmixing method. Experimental results attest the superior performance of the proposed method when comparing with other, state-of-the-art, related strategies.
SQUID magnetometer based on Grooved Dayem nanobridges and a flux transformer
Creators: name: Trabaldo, Edoardo
name: Pfeiffer, Christoph
name: Andersson, Eric
name: Arpaia, Riccardo
name: Kalaboukhov, Alexei
name: Winkler, Dag
name: Lombardi, Floriana
name: Bauch, Thilo
Publisher: name: arXiv
Year: 2019
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report noise measurements performed on a SQUID magnetometer implementing Grooved Dayem nanobridge of YBCO as weak-links. The SQUID shows magnetic flux noise as low as 10 $μΦ_0$/Hz$^{0.5}$. The magnetometer is realized by coupling the SQUID to a flux transformer with a two-level coupling scheme using a flip-chip approach. This improves the effective area of the SQUID and result in a magnetic field noise of 50 fT/Hz$^{0.5}$ at T=77 K.
description: 4 pages, 4 figures
Semantic Storage of climate data on object stores
Creators: name: Massey, Neil R.
Publisher: name: Zenodo
Year: 2018
Subjects: subject: ecology and environment
subject: https://id.loc.gov/authorities/subjects/sh85040468.html
subject: https://id.loc.gov/authorities/subjects/sh85084334.html

description: New methods for storing large volumes of data, such as cloud systems and object storage present opportunities: Improved access and user management over POSIX Parallel reads / writes Read / write from anywhere (no need to mount disks) and challenges: Interface and access methods for users are changed Exploit parallel and remote access nature of stores with S3 HTTP API While maintaining a familiar and consistent API for the user S3-netCDF-python: Library to read/write netCDF 3 and netCDF 4 via a S3 HTTP API Files can be streamed directly to memory or cached to disk Files can be split into smaller objects Multiple objects can be streamed in parallel
description: Previously curated at: http://cedadocs.ceda.ac.uk/1443/ The publish date on this item was its original published date. This item was previously associated with content (as an official url) at: https://www.neodc.rl.ac.uk. This work was funded by: NERC. Main files in this record: nrmassey_ncas2018_poster.pdf nrmassey_ncas2018_poster.pptx Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Miss Hayley Gray. Transferred to CEDA document repository community on Zenodo on 2022-11-24
Three-dimensional topology optimization of auxetic metamaterial using isogeometric analysis and model order reduction
Creators: name: Nguyen, Chuong
name: Zhuang, Xiaoying
name: Chamoin, Ludovic
name: Nguyen-Xuan, Hung
name: Zhao, Xianzhong
name: Rabczuk, Timon
Publisher: name: arXiv
Year: 2019
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences

description: In this work, we present an efficiently computational approach for designing material micro-structures by means of topology optimization. The central idea relies on using the isogeometric analysis integrated with the parameterized level set function for numerical homogenization, sensitivity calculation and optimization of the effective elastic properties. Design variables, which are level set values associated with control points, are updated from the optimizer and represent the geometry of the unit cell. We further improve the computational efficiency in each iteration by employing reduced order modeling when solving linear systems of the equilibrium equations. We construct a reduced basis by reusing computed solutions from previous optimization steps, and a much smaller linear system of equations is solved on the reduced basis. Two- and three-dimensional numerical results show the effectiveness of the topology optimization algorithm coupled with the reduced basis approach in designing metamaterials.
The Behavior of Slurry infiltrated fibrous Concrete with waste marble Dust As Filler
Creators: name: Dawit Beza
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Fine Filler, waste marble dust, Compressive Strengths, Flexural Strength and Tensile Strength

description: In our construction industry, the use of conventional construction material and conventional construction
 technologies makes construction expensive and hazardous to the environment that the use of alternative
 construction material and construction technologies in our construction industry is very important so in
 this study the behavior of SIFCON with waste marble dust as filler are studied and slurry infiltrated
 fibrous concrete is special type of steel fiber concrete (SFC) with a high volume fraction of fiber. It
 possesses high ductility and high mechanical properties with special application of SIFCON lamination
 for structural member of buildings and It improves the strength of concrete structural members up to 25%
 for normal concrete and up to 40% for fibrous reinforced concretes and used for remedial works for
 weaken concrete structural members of buildings and this type of concrete uses a matrix consisting of
 very fine particles or filler to enhance its fibrous interlock properties. The purpose of this paper is to study
 the possibility of using marble waste powder as fine fillers in slurry infiltrated fibrous concrete
 production. From previous studies the use of marble waste powder filler for concrete production
 improves property of flowable concrete up to a certain limit so that for this purpose four different serious
 of concrete were prepared by adding different dosage of WMP (0%,10%,20%,30%, 40%) by weight of
 cement .To study the performance of SIFCON , a total of eighteen samples were prepared with the
 addition of waste marble powder with different additional range (0%,10%,20%,30%, 40% ) . For each
 replacement, C-30 were prepared the testes were on the mechanical properties of SIFCON that is
 compressive, tensile and flexural strength of the concrete and UPV test are conducted to check the
 porosity of the samples. The results indicate that the amount of ingredient (cement, sand) is reduced up to
 10 % because the fresh volume can be increased up to 15 % and final SEM are conducted to observe the
 microstructure of the samples. the use of waste marble powder in SIFCON as fine filler improves the
 consistency and workability up to 30% usage so that from previous literatures that is because the
 lubricating power of very fine limestone particle and also compressive ,tensile and flexural strength
 shows progress up 30% usage and the optimum usage is 30% more than this percentage it is observed
 that reduction in workability and also in compressive, tensile and flexural strength of SIFCON.
Improving Student Understanding of Coulomb's Law and Gauss's Law
Creators: name: Singh, Chandralekha
Publisher: name: arXiv
Year: 2016
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: We discuss the development and evaluation of five research-based tutorials on Coulomb's law, superposition, symmetry and Gauss's Law to help students in the calculus-based introductory physics courses learn these concepts. We discuss the performance of students on the pre-/post-tests given before and after the tutorials in three calculus-based introductory physics courses. We also discuss the performance of students who used the tutorials and those who did not use it on a multiple-choice test which employs concepts covered in the tutorials.
description: 4 pages, PACS: 01.40Fk,01.40.gb,01.40G-,1.30.Rr
Two-particle scattering and resistivity of Rashba electron gas
Creators: name: Nagaev, K. E.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We calculate the electrical resistivity of a two-dimensional electron gas that results from two-particle collisions and strong Rashba spin-orbit coupling. In the absence of impurities, two-particle collisions do not contribute to resistivity. When combined with impurity scattering, the two-particle correction to the resistivity is proportional to the square of temperature $T$ if only the lower helicity band is filled, but the $T^2$ term vanishes if the Fermi level is above the Dirac point.
description: 5 pages, 2 figures
A unified slip boundary condition for flow over a surface
Creators: name: Thalakkottor, Joseph John
name: Mohseni, Kamran
Publisher: name: arXiv
Year: 2015
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Interface between two phases of matter are ubiquitous in nature and technology. Determining the correct velocity condition at an interface is essential for understanding and designing of flows over a surface. We demonstrate that both the widely used no-slip and the Navier and Maxwell slip boundary conditions do not capture the complete physics associated with complex problems, such as spreading of liquids or corner flows. Hence, we present a unified boundary condition that is applicable to a wide-range of flow problems.
description: 11 pages, 14 figure
Unconventional superconductivity in low density electron systems and conventional superconductivity in hydrogen metallic alloys under pressure
Creators: name: Kagan, Maxim Yu.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: In a short review-article we first discuss the results, which are mainly devoted to the generalizations of the famous Kohn-Luttinger mechanism of superconductivity in purely repulsive fermion systems at low electron densities. In the context of repulsive-U Hubbard model and Shubin-Vonsovsky model we consider briefly the superconducting phase diagrams and the symmetries of the order parameter in novel strongly correlated electron systems including idealized monolayer and bilayer graphene. We stress that purely repulsive fermion systems are mainly the subject of unconventional low-temperature superconductivity. To get the high temperature superconductivity in cuprates (with T_C of the order of 100 K) we should proceed to the t-J model with the Van der Waals interaction potential and the competition between short-range repulsion and long-range attraction. Finally we stress that to describe superconductivity in metallic hydrogen alloys under pressure (with T_C of the order of 200 K) it is reasonable to reexamine more conventional mechanisms connected with electron-phonon interaction. These mechanisms arise in the attractive-U Hubbard model with static onsite or intersite attractive potential or in more realistic theories (which include retardation effects) such as Migdal-Eliashberg strong coupling theory or even Fermi-Bose mixture theory of Ranninger et al., and its generalizations.
description: Review article, 15 pages, 10 figures, 142 refernces
EUFAR Flight Finder & CEDA Satellite data finder
Creators: name: Garland, Wendy
Publisher: name: Zenodo
Year: 2018
Subjects: subject: ecology and environment
subject: https://id.loc.gov/authorities/subjects/sh85040468.html
subject: https://id.loc.gov/authorities/subjects/sh85084334.html

description: Searching for data collected on moving platforms such as research can be difficult. The EUFAR Flight Finder tool is a geospatial / temporal key word search tool to maximise discovery, access and reuse of data collected by the EUFAR research air craft.
description: Previously curated at: http://cedadocs.ceda.ac.uk/1445/ The publish date on this item was its original published date. This item was previously associated with content (as an official url) at: https://www.neodc.rl.ac.uk. Main files in this record: eufar flight finder poster.jpg Wendy Eufar flight finder poster.pdf Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Miss Hayley Gray. Transferred to CEDA document repository community on Zenodo on 2022-11-24
Spectral stability of monotone traveling fronts for reaction diffusion-degenerate Nagumo equations
Creators: name: Leyva, J. Francisco
name: Ríos, Luis F. López
name: Plaza, Ramón G.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35K57, 35B40, 35K65, 35B35

description: This paper establishes the spectral stability of monotone traveling front solutions for reaction-diffusion equations where the reaction function is of Nagumo (or bistable) type and with diffusivities which are density dependent and degenerate at zero (one of the equilibrium points of the reaction). Spectral stability is understood as the property that the spectrum of the linearized operator around the wave, acting on an exponentially weighted space, is contained in the complex half plane with non-positive real part. Three different types of monotone waves are studied: (i) stationary diffusion-degenerate fronts, connecting the two stable equilibria of the reaction; (ii) traveling diffusion-degenerate fronts connecting zero with the unstable equilibrium; and, (iii) non-degenerate fronts. In the first two cases, the degeneracy is responsible of the loss of hyperbolicity of the asymptotic coefficient matrices of the spectral problem at one of the end points, precluding the application of standard techniques to locate the essential spectrum. This difficulty is overcome with a suitable partition of the spectrum, a generalized convergence of operators technique, the analysis of singular (or Weyl) sequences and the use of energy estimates. The monotonicity of the fronts, as well as detailed descriptions of the decay structure of eigenfunctions on a case by case basis, are key ingredients to show that all traveling fronts under consideration are spectrally stable in a suitably chosen exponentially weighted $L^2$ energy space.
description: 34 pages, 1 figures
The Level of Building color Harmonization prospect in Addis Ababa The case of Bole Boulevard
Creators: name: Zereyakob Getachew
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: boulevard, chromaticscape, harmony, aesthetic

description: The current color selection and application of buildings in Addis Ababa is causing a significant
 disorder in harmony of the city. Research has shown that cities are identified and labeled by
 their attractiveness through harmony of its buildings and colors. This study aims to investigate
 the visual effects and characteristics of existing building color selection and application on the
 city boulevards and to examine user’s visual satisfaction on the current color harmony of the
 city. Based on the review of the literature on city color harmony color selection and application,
 an online survey was distributed to architects ,which are a part of the society practicing design
 and construction across the city of Addis Ababa, and asked to respond to set of questions on
 the concerning matter of color harmony. And a natural color system (NCS) analysis was also
 applied to determine the level of harmony found on the current statues of Bole Boulevard.
 Analysis of the response demonstrate that the existing condition of the city regarding to color
 design is poor and the task of color design is not well known and practiced with in the architect
 community. The result of the study indicated that the color selection and application of
 buildings design have an impact on the harmonization of the city and viewers satisfaction to
 ward city aesthetic. On this basis, it is recommended that architects must practice color design
 as a key factors in harmonizing and beautifying the city also further research is needed to
 identify other factors that could strengthen the effectiveness of the matter.
Continuous probe of cold complex molecules with infrared frequency comb spectroscopy
Creators: name: Spaun, Ben
name: Changala, P. Bryan
name: Patterson, David
name: Bjork, Bryce J.
name: Heckl, Oliver H.
name: Doyle, John M.
name: Ye, Jun
Publisher: name: arXiv
Year: 2016
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Cavity-enhanced frequency comb spectroscopy for molecule detection in the mid-infrared powerfully combines high resolution, high sensitivity, and broad spectral coverage. However, this technique, and essentially all spectroscopic methods, is limited in application to relatively small, simple molecules. Here we integrate comb spectroscopy with continuous, cold samples of molecules produced via buffer gas cooling, thus enabling the study of significantly more complex molecules. We report simultaneous gains in resolution, sensitivity, and bandwidth and demonstrate this combined capability with the first rotationally resolved direct absorption spectra in the CH stretch region of several complex molecules. These include nitromethane (CH$_3$NO$_2$), a model system that presents challenging questions to the understanding of large amplitude vibrational motion, as well as several large organic molecules with fundamental spectroscopic and astrochemical relevance, including naphthalene (C$_{10}$H$_8$), adamantane (C$_{10}$H$_{16}$), and hexamethylenetetramine (C$_{6}$N$_4$H$_{12}$). This general spectroscopic tool has the potential to significantly impact the field of molecular spectroscopy, simultaneously improving efficiency, spectral resolution, and specificity by orders of magnitude. This realization could open up new molecular species and new kinetics for precise investigations, including the study of complex molecules, weakly bound clusters, and cold chemistry.
title: Holomorphic curves in the symplectizations of lens spaces: An elementary approach
Creators: name: Sağlam, Murat
Publisher: name: Mathematisches Institut (Universität Münster)
Year: 2023
Subjects: subject: 510 Mathematics

description: We present an elementary computational scheme for the moduli spaces of rational pseudo-holomorphic curves in the symplectizations of 3-dimensional lens spaces, which are equipped with Morse–Bott contact forms induced by the standard Morse–Bott contact form on S3. As an application, we prove that, for p prime and 1 < q, q′ < p − 1, if there is a contactomorphism between lens spaces L(p, q) and L(p, q′), where both spaces are equipped with their standard contact structures, then q ≡ (q′)±1 in mod p. For the proof, we study the moduli spaces of a pair of pants with two non-contractible ends in detail and establish that the standard almost complex structure that is used is regular. Then the existence of a contactomorphism enables us to follow a neck-stretching process, by means of which we compare the homotopy relations encoded at the non-contractible ends of the pair of pants in the symplectizations of L(p, q) and L(p, q′). Combining our proof with the result of Honda on the classification of universally tight contact structures on lens spaces, we provide a purely symplectic/contact topological proof of the diffeomorphism classification of lens spaces in the class mentioned above.
Diapria (Tropidopria) nocticolor Kieffer 1911
Creators: name: Notton, David G.
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Chalcididae
Diapria
Diapria nocticolor

description: Diapria (Tropidopria) nocticolor Kieffer, 1911b: 977.
Valid name
Trichopria oogaster (Thomson, 1858).
Summary of types
Lectotype ♂, BMNH number 9.698, designated by Notton (1995).
Primary type data
York; Type; 266.; Cameron Coll./ 1910-55.; nocticolor K.; Holo-/ type; Lectotype ♂ / Diapria Tropidopria / nocticolor Kieffer / des. Notton, 1995.
Type locality
England, York.
Remarks
This species was described from an unspecified number of males. The lectotype is mounted on a card, the right antenna is broken and the right fore wing and both hind wings are missing.
description: Published as part of Notton, David G., 2014, A catalogue of the types of Diapriinae (Hymenoptera, Diapriidae) at the Natural History Museum, London, pp. 1-123 in European Journal of Taxonomy 75 on page 72, DOI: 10.5852/ejt.2014.75, http://zenodo.org/record/3862773
Bringing the Global Climate Projections Archive to UK Researchers
Creators: name: Juckes, Martin N
Publisher: name: Zenodo
Year: 2018
Subjects: subject: ecology and environment
subject: https://id.loc.gov/authorities/subjects/sh85040468.html
subject: https://id.loc.gov/authorities/subjects/sh85084334.html

description: Looking at the CMIP5 archive, the contribution from CEDA and looking at the next stage of CMIP6.
description: Previously curated at: http://cedadocs.ceda.ac.uk/1446/ This work was funded by: NERC. Main files in this record: Bringing Global climate projections archive to UK researchers poster.jpg Global climate projections archive poster.pdf Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Miss Hayley Gray. Transferred to CEDA document repository community on Zenodo on 2022-11-24
Oscillation of Newly Formed Loops After Magnetic Reconnection in the Solar Chromosphere
Creators: name: Yang, Shuhong
name: Xiang, Yongyuan
Publisher: name: arXiv
Year: 2016
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: With the high spatial and temporal resolution H$α$ images from the New Vacuum Solar Telescope, we focus on two groups of loops with a X-shaped configuration in the dynamic chromosphere. We find that the anti-directed loops approach each other and reconnect continually. The connectivity of the loops is changed and new loops are formed and stack together. The stacked loops are sharply bent, implying that they are greatly impacted by the magnetic tension force. When another more reconnection process takes place, one new loop is formed and stacks with the previously formed ones. Meanwhile, the stacked loops retract suddenly and move toward the balance position, performing an overshoot movement, which led to an oscillation with an average period of about 45 s. The oscillation of newly formed loops after magnetic reconnection in the chromosphere is observed for the first time. We suggest that the stability of the stacked loops is destroyed due to the join of the last new loop and then suddenly retract under the effect of magnetic tension. Because of the retraction, another lower loop is pushed outward and performs an oscillation with the period of about 25 s. The different oscillation periods may be due to their difference in three parameters, i.e., loop length, plasma density, and magnetic field strength.
description: Accepted for publication in ApJL
Modelling the flexoelectric effect in solids: a micromorphic approach
Creators: name: McBride, Andrew
name: Davydov, Denis
name: Steinmann, Paul
Publisher: name: arXiv
Year: 2019
Subjects: subject: Classical Physics (physics.class-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Flexoelectricity is characterised by the coupling of the gradient of the deformation and the electrical polarization in a dielectric material. A novel micromorphic approach is presented to accommodate the resulting higher-order gradient contributions arising in this highly-nonlinear and coupled problem within a classical finite element setting. The formulation accounts for all material and geometric nonlinearities, as well as the coupling between the mechanical, electrical and micromorphic fields. The highly-nonlinear system of governing equations are derived using the Dirichlet principle and solved using the finite element method. A series of numerical examples serve to elucidate the theory and to provide insight into this fascinating effect.
Study on Behavior of interlocking compressed Earth block Using Municipal Solid Waste Incinerated Bottom Ash
Creators: name: Tefera Getie
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: Interlocking Compressed Earth Block; Cement; MSWI bottom ash

description: Interlocking compressed earth blocks were the modern form of earth block production
 for the construction of houses. In developing countries using earth as a construction
 material was an economical, sustainable, environmental friend and most efficient
 means to build houses. Much effort had not been done to utilize municipal solid waste
 incinerated bottom ash for the production of interlocking compressed earth blocks since
 a high amount of bottom ash was discharged from the incineration plant per day. The
 use of this municipal solid waste incinerated bottom ash in construction mitigates the
 environmental dangers associated with ash disposal in landfills and reduces the
 requirement of cement. This research was conducted on interlocking compressed earth
 blocks using municipal solid waste incineration bottom ash related to mechanical
 properties and production cost. The mechanical properties of interlocking compressed
 earth blocks and materials laboratory experimenters were done with different mix
 proportions in the ratio of 2 %, 4%, 6% and 8% municipal solid waste incinerated
 bottom ash with 8%,6%,4% and 2% cement and also 10%,15%and 20% municipal solid
 waste incinerated bottom ash without cement in the weight of mix soil. From this up to
 6% municipal solid waste incinerated bottom ash with 4%cement mix gave better result
 on the compressive strength and water absorption capacity, which exceeds the
 minimum standard requirement. The addition of municipal solid waste incinerated
 bottom ash above 6 percent gave high water absorption capacity and low compressive
 strength, which reduce the long-term durability of the blocks. Interlocking compressed
 earth blocks without municipal solid waste incinerated bottom ash had a little higher
 compressive strength and low water absorption capacity. However, using municipal
 solid waste incinerated bottom ash for the production of compressed earth blocks
 reduces, the production cost and environmental pollution without compromising
 minimum standard requirement. The production cost of interlocking compressed earth
 blocks was minimized up to 33 percent (3 birrs) per block by using 6%MSWI bottom
 ash with 4% cement. Therefore, stabilizing with bottom ash and cement was a more
 economical and environmentally friendly method.
Ballistic Lévy walk with rests: Escape from a bounded domain
Creators: name: Kamińska, A.
name: Srokowski, T.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The Lévy walk process for the lower interval of the time of flight distribution ($α<1$) and with finite resting time between consecutive flights is discussed. The motion is restricted to a region bounded by two absorbing barriers and the escape process is analysed. By means of a Poisson equation, the total density, which includes both flying and resting phase, is derived and the first passage time properties determined: the mean first passage time appears proportional to the barrier position; moreover, the dependence of that quantity on $α$ is established. Two limits emerge from the model: of short waiting time, that corresponds to Lévy walks without rests, and long waiting time which exhibits properties of a Lévy flights model. The similar quantities are derived for the case of a position-dependent waiting time. Then the mean first passage time rises with barrier position faster than for Lévy flights model. The analytical results are compared with Monte Carlo trajectory simulations.
description: 8 pages, 5 figures
Study The Effect of Water ions on Mechanical Properties of Concrete
Creators: name: Anteneh Mitiku
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2021
Subjects: River waters, impurities, cations, anions, compressive strength

description: The ever growth of the country consumes huge amount of construction materials from which
 concrete took the great share. Concrete is a composite material and it is composed of cement,
 aggregates, water and sometimes admixture used to make concrete. These ingredient materials
 are collected from different sources and needs to know the properties of materials before
 mixing together. Water is one of the most important ingredients in concrete and has less
 attention in the construction industry. Potable water is scarce and most of the construction
 sector need huge amount of water beyond the capacity of the municipality water supply. Water
 is used for mixing of concrete and has lots of chemical impurities like cations and anions. In
 this study, chemical analysis of different water sources conducted and sensitivity analysis on
 compressive strength was evaluated. The test cube samples were prepared as per the BS.1881,
 1983 standard with 150×150×150 mm and as per the ASTM C 78 standard. The beams were
 prepared with 100×100 mm in cross-sectional dimension and has a length of 500mm. The
 beams are simply supported at 450mm and tested for center point loading. All tests are
 conducted using a universal testing machine. The result shows that in OPC cement yielded
 lower strength in KM and DM Whereas in PPC cement lower strength recorded in KDa, KDe,
 KM, ADa, ADe, TDa, TDe, TM, and DDe as compared to control mix and the standard set by
 codes. This may be due to the effect of ions present in water. The sensitivity analysis shows
 that chloride and sulphate in OPC has inverse relationship with compressive strength besides
 magnesium and potassium have a direct relationship with compressive strength. Similarly,
 chloride in PPC has a direct relationship with compressive strength and all the remaining
 parameters have inverse relationship with compressive strength.
s-LWSR: Super Lightweight Super-Resolution Network
Creators: name: Li, Biao
name: Liu, Jiabin
name: Wang, Bo
name: Qi, Zhiquan
name: Shi, Yong
Publisher: name: arXiv
Year: 2019
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Deep learning (DL) architectures for superresolution (SR) normally contain tremendous parameters, which has been regarded as the crucial advantage for obtaining satisfying performance. However, with the widespread use of mobile phones for taking and retouching photos, this character greatly hampers the deployment of DL-SR models on the mobile devices. To address this problem, in this paper, we propose a super lightweight SR network: s-LWSR. There are mainly three contributions in our work. Firstly, in order to efficiently abstract features from the low resolution image, we build an information pool to mix multi-level information from the first half part of the pipeline. Accordingly, the information pool feeds the second half part with the combination of hierarchical features from the previous layers. Secondly, we employ a compression module to further decrease the size of parameters. Intensive analysis confirms its capacity of trade-off between model complexity and accuracy. Thirdly, by revealing the specific role of activation in deep models, we remove several activation layers in our SR model to retain more information for performance improvement. Extensive experiments show that our s-LWSR, with limited parameters and operations, can achieve similar performance to other cumbersome DL-SR methods.
MOL-D: A Collisional Database and Web Service within the Virtual Atomic and Molecular Data Center
Creators: name: Vujčić, V.
name: Jevremović, D.
name: Mihajlov, A. A.
name: Ignjatović, Lj. M.
name: Srećković, V. A.
name: Dimitrijević, M. S.
name: Malović, M.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: MOL-D database is a collection of cross-sections and rate coefficients for specific collisional processes and a web service within the Serbian Virtual Observatory (SerVO) and the Virtual Atomic and Molecular Data Center (VAMDC). This database contains photo-dissociation cross-sections for the individual ro-vibrational states of the diatomic molecular ions and rate coefficients for the atom-Rydberg atom chemi-ionization and inverse electron-ion-atom chemi-recombination processes. At the moment it contains data for photodissociation cross-sections of hydrogen H2+ and helium He2+ molecular ions and the corresponding averaged thermal photodissociation cross-sections. The ro-vibrational energy states and the corresponding dipole matrix elements are provided as well. Hydrogen and helium molecular ion data are important for calculation of solar and stellar atmosphere models and for radiative transport, as well as for kinetics of other astrophysical and laboratory plasma (i.e. early Universe).
Benchmarking machine learning models on multi-centre eICU critical care dataset
Creators: name: Sheikhalishahi, Seyedmostafa
name: Balaraman, Vevake
name: Osmani, Venet
Publisher: name: arXiv
Year: 2019
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Progress of machine learning in critical care has been difficult to track, in part due to absence of public benchmarks. Other fields of research (such as computer vision and natural language processing) have established various competitions and public benchmarks. Recent availability of large clinical datasets has enabled the possibility of establishing public benchmarks. Taking advantage of this opportunity, we propose a public benchmark suite to address four areas of critical care, namely mortality prediction, estimation of length of stay, patient phenotyping and risk of decompensation. We define each task and compare the performance of both clinical models as well as baseline and deep learning models using eICU critical care dataset of around 73,000 patients. This is the first public benchmark on a multi-centre critical care dataset, comparing the performance of clinical gold standard with our predictive model. We also investigate the impact of numerical variables as well as handling of categorical variables on each of the defined tasks. The source code, detailing our methods and experiments is publicly available such that anyone can replicate our results and build upon our work.
description: Source code to replicate the results https://github.com/mostafaalishahi/eICU_Benchmark
NCAS Computing skills training
Creators: name: Stephens, Ag
Publisher: name: Zenodo
Year: 2018
Subjects: subject: ecology and environment
subject: https://id.loc.gov/authorities/subjects/sh85040468.html
subject: https://id.loc.gov/authorities/subjects/sh85084334.html

description: The introduction to scientific computing course covers the skills needed for managing and analysing data using Linux and Python.
description: Previously curated at: http://cedadocs.ceda.ac.uk/1447/ The publish date on this item was its original published date. This work was funded by: NERC. Main files in this record: NCAS Computing skills training poster.jpg NCAS Computing skills training poster.pdf Item originally deposited with Centre for Environmental Data Analysis (CEDA) document repository by Miss Hayley Gray. Transferred to CEDA document repository community on Zenodo on 2022-11-24
On-chip integrated, silicon-graphene plasmonic Schottky photodetector, with high responsivity and avalanche photogain
Creators: name: Goykhman, Ilya
name: Sassi, Ugo
name: Desiatov, Boris
name: Mazurski, Noa
name: Milana, Silvia
name: de Fazio, Domenico
name: Eiden, Anna
name: Khurgin, Jacob
name: Shappir, Joseph
name: Levy, Uriel
name: Ferrari, Andrea C.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We report an on-chip integrated metal-graphene-silicon plasmonic Schottky photodetector with 85mA/W responsivity at 1.55 um and 7% internal quantum efficiency. This is one order of magnitude higher than metal-silicon Schottky photodetectors operated in the same conditions. At a reverse bias of 3V, we achieve avalanche multiplication, with 0.37A/W responsivity and avalanche photogain~2. This paves the way to graphene integrated silicon photonics.
Modelling ice birefringence and oblique radio wave propagation for neutrino detection at the South Pole
Creators: name: Jordan, T. M.
name: Besson, D. Z.
name: Kravchenko, I.
name: Latif, U.
name: Madison, B.
name: Novikov, A.
name: Shultz, A.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Askaryan Radio Array (ARA) experiment at the South Pole is designed to detect high-energy neutrinos which, via in-ice interactions, produce coherent radiation at frequencies up to 1000 MHz. In Dec. 2018, a custom high-amplitude radio-frequency transmitter was lowered into the 1700 m SPICE ice core to provide test sources for ARA receiver stations sensitive to vertical and horizontal polarizations. For these tests, signal geometries correspond to obliquely propagating radio waves from below. The ARA collaboration has recently measured the polarization-dependent time delay variation, and report more significant time delays for trajectories perpendicular to ice flow. Here we use fabric data from the SPICE ice core to construct a bounding model for the ice birefringence and the polarization time delays across ARA. The data-model comparison is consistent with the vertical girdle fabric at the South Pole having the prevailing horizontal crystallographic axis oriented near-perpendicular to ice flow. This study presents the possibility that ice birefringence can be used to constrain the range to a neutrino interaction, and hence aid in neutrino energy reconstruction, for in-ice experiments such as ARA.
description: submitted to Ann. Glac
Neutral Functional Differential Equations with Applications to Compartmental Systems
Creators: name: Muñoz-Villarragut, Víctor
name: Novo, Sylvia
name: Obaya, Rafael
Publisher: name: arXiv
Year: 2024
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37B55, 34K40, 34K14

description: We study the monotone skew-product semiflow generated by a family of neutral functional differential equations with infinite delay and stable D-operator. The stability properties of D allow us to introduce a new order and to take the neutral family to a family of functional differential equations with infinite delay. Next, we establish the 1-covering property of omega-limit sets under the componentwise separating property and uniform stability. Finally, the obtained results are applied to the study of the long-term behavior of the amount of material within the compartments of a neutral compartmental system with infinite delay.
description: 26 pages
Stationary measures and phase transition for a class of probabilistic cellular automata
Creators: name: Pra, Paolo Dai
name: Louis, Pierre-Yves
name: Roelly, Sylvie
Publisher: name: arXiv
Year: 2016
Subjects: subject: Probability (math.PR)
subject: Discrete Mathematics (cs.DM)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: Cellular Automata and Lattice Gases (nlin.CG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We discuss various properties of Probabilistic Cellular Automata, such as the structure of the set of stationary measures and multiplicity of stationary measures (or phase transition) for reversible models.