cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Remarks on the Hölder-continuity of solutions to parabolic equations with conic singularities
Creators: name: Wang, Yuanqi
Publisher: name: arXiv
Year: 2016
Subjects: subject: Analysis of PDEs (math.AP)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: This is a note on \cite{LSU} and \cite{FS}. Using their work line by line, we prove the Hölder-continuity of solutions to linear parabolic equations of mixed type, assuming the coefficient of $\frac{\partial}{\partial t}$ has time-derivative bounded from above. On a Kähler manifold, this Hölder estimate works when the metrics possess conic singularities along a normal crossing divisor.
description: 16 pages, no figure, comments are welcome
Stellungnahme zu Puebla
Creators: name: Boogaard, Antoine Van Den
name: Brand, Paul
name: Geffré, Claude
name: Küng, Hans
name: Metz, Johann Baptist
name: Schillebeeckx, Edward
Publisher: name: Concilium
Year: 1970

description: Concilium, Bd. 14 Nr. 10 (1978): Concilium: Internationale Zeitschrift für Theologie, Band 14, Heft 10
A novel method to evaluate spin diffusion length of Pt
Creators: name: Zhang, Y. Q.
name: Sun, N. Y.
name: Che, W. R.
name: Shan, R.
name: Zhu, Z. G.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Spin diffusion length of Pt is evaluated via proximity effect of spin orbit coupling (SOC) and anomalous Hall effect (AHE) in Pt/Co2FeAl bilayers. By varying the thicknesses of Pt and Co2FeAl layer, the thickness dependences of AHE parameters can be obtained, which are theoretically predicted to be proportional to the square of the SOC strength. According to the physical image of the SOC proximity effect, the spin diffusion length of Pt can easily be identified from these thickness dependences. This work provides a novel method to evaluate spin diffusion length in a material with a small value.
description: 4 pages,4 figures
title: Mechanical properties of 3D printable responsive cement mortar after magnetic intervention
Creators: name: Zhan, Yiyuan
name: Lesage, Karel
name: De Schutter, Geert
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: Active stiffening control
subject: Magnetic field
subject: Magneto-responsive aggregate
subject: 3D printing
subject: 62

description: Rheology and stiffening control can contribute in a significant way to the quality of concrete structures in general and can facilitate the promotion of 3D printing technology more specially. Active stiffening control (ASC) has the potential to solve conflicting rheological requirements of 3D printable materials during pumping, extruding and deposition. Responding to an external signal, the rheological properties of cementitious materials with mixed-in responsive com-ponents can be adjusted on demand. However, the mechanical properties of hardened responsive cementitious materials are unclear. This research investigates the mechanical properties of 3D printable cement mortar containing responsive aggregates after being exposed to a magnetic field. A customized nozzle equipped with magnetic intervention is designed. Two different magnetic field strengths (0.1 T and 0.3 T) are applied on the printing nozzle. The com-pressive and flexural strengths of specimens extracted from 3D printed wall elements printed with the help of ASC are explored at 7 days and 28 days. Magnetic field intervention adjusted the rheological properties in time and on de-mand without negatively affecting the mechanical properties after hardening when the responsive aggregates to cement mass ratio was 2.3:1. Compared with the 28-day strength, magnetic intervention has greater influence on the compres-sive and flexural strength at the age of 7 days.
description: Digital Concrete 2024 - Supplementary Proceedings
Modelling the number density of Halpha emitters for future spectroscopic near-IR space missions
Creators: name: Pozzetti, L.
name: Hirata, C. M.
name: Geach, J. E.
name: Cimatti, A.
name: Baugh, C.
name: Cucciati, O.
name: Merson, A.
name: Norberg, P.
name: Shi, D.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The future space missions Euclid and WFIRST-AFTA will use the Halpha emission line to measure the redshifts of tens of millions of galaxies. The Halpha luminosity function at z>0.7 is one of the major sources of uncertainty in forecasting cosmological constraints from these missions. We construct unified empirical models of the Halpha luminosity function spanning the range of redshifts and line luminosities relevant to the redshift surveys proposed with Euclid and WFIRST-AFTA. By fitting to observed luminosity functions from Halpha surveys, we build three models for its evolution. Different fitting methodologies, functional forms for the luminosity function, subsets of the empirical input data, and treatment of systematic errors are considered to explore the robustness of the results. Functional forms and model parameters are provided for all three models, along with the counts and redshift distributions up to z~2.5 for a range of limiting fluxes (F_Halpha>0.5 - 3 x 10^-16 erg cm^-2 s^-1) that are relevant for future space missions. For instance, in the redshift range 0.901 and 2 x 10^-16 erg cm^-2 s^-1, and 32000--48000 for F_Halpha>0.5 x 10^-16 erg cm^-2 s^-1 in the extended redshift range 0.40
description: 16 pages, 7 figures, A&A (in press, preprint version available online). Models can be downloaded at http://www.bo.astro.it/~pozzetti/Halpha/Halpha.html
title: Improving Thermal Insulation Performance of 3D Printed Concrete Wall
Creators: name: Liu, Ruiqing
name: Du, Hongjian
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: thermal insulation
subject: 3D concrete printing(3DCP)
subject: energy saving
subject: steady-state analysis
subject: U-value
subject: 62

description: In recent years, there has been significant research focus on 3D concrete printing (3DCP) technology, driven by its potential to revolutionize construction through automation. While structural aspects of 3DCP have received attention, thermal performance remains understudied. This research aims to identify optimal internal patterns for 3D-printed concrete walls, emphasizing thermal insulation and energy reduction. Six wall models were examined, and results show that patterned 3D-printed walls have lower U-values, with the two-row triangular wall (2TRI-H) demonstrating the most significant thermal insulation improvement.
description: Digital Concrete 2024 - Supplementary Proceedings
Controlling the Numerical Cerenkov Instability in PIC simulations using a customized finite difference Maxwell solver and a local FFT based current correction
Creators: name: Li, Fei
name: Yu, Peicheng
name: Xu, Xinlu
name: Fiuza, Frederico
name: Decyk, Viktor K.
name: Dalichaouch, Thamine
name: Davidson, Asher
name: Tableman, Adam
name: An, Weiming
name: Tsung, Frank S.
name: Fonseca, Ricardo A.
name: Lu, Wei
name: Mori, Warren B.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: In this paper we present a customized finite-difference-time-domain (FDTD) Maxwell solver for the particle-in-cell (PIC) algorithm. The solver is customized to effectively eliminate the numerical Cerenkov instability (NCI) which arises when a plasma (neutral or non-neutral) relativistically drifts on a grid when using the PIC algorithm. We control the EM dispersion curve in the direction of the plasma drift of a FDTD Maxwell solver by using a customized higher order finite difference operator for the spatial derivative along the direction of the drift ($\hat 1$ direction). We show that this eliminates the main NCI modes with moderate $\vert k_1 \vert$, while keeps additional main NCI modes well outside the range of physical interest with higher $\vert k_1 \vert$. These main NCI modes can be easily filtered out along with first spatial aliasing NCI modes which are also at the edge of the fundamental Brillouin zone. The customized solver has the possible advantage of improved parallel scalability because it can be easily partitioned along $\hat 1$ which typically has many more cells than other directions for the problems of interest. We show that FFTs can be performed locally to current on each partition to filter out the main and first spatial aliasing NCI modes, and to correct the current so that it satisfies the continuity equation for the customized spatial derivative. This ensures that Gauss' Law is satisfied. We present simulation examples of one relativistically drifting plasmas, of two colliding relativistically drifting plasmas, and of nonlinear laser wakefield acceleration (LWFA) in a Lorentz boosted frame that show no evidence of the NCI can be observed when using this customized Maxwell solver together with its NCI elimination scheme.
title: Challenges in Enhancing Workability and Printability for 3D-Printable Geopolymer Mortar
Creators: name: Khokher, Shawn
name: Sanguinetti, Paola
name: O’Reilly, Matthew
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: 3D concrete printing
subject: Geopolymer Mortar
subject: Mix Design
subject: Sustainable Concrete
subject: Printability
subject: 62

description: Geopolymer concrete utilizing fly ash as an alternative to Portland cement is a focus in research aimed at reducing CO2 emissions. In some mix designs, geopolymer concrete sets rapidly limiting its open time which poses significant challenges to adoption. Furthermore, the use of 3D printing as a construction method has also seen increasing interest due to the potential time savings, but is not without its drawbacks. This paper explores the complexities associated with geopolymer concrete for 3D Concrete Printing (3DCP). The balance between workability and sustainability, essential for 3DCP success, necessitates precise mix designs. The global variations in aggregates, sizes, admixtures, and deposition methods add further intricacy to creating a standardized mix design. The study addresses these challenges by developing a 3D printable mix design for geopolymer mortar. Specifically, the research formulates a geopolymer mortar with Class F fly ash for an air-pressurized 3DCP technique. Introducing sucrose as a set retarder enhances workability and printability in an intuitively developed mix design. Closer analysis, however, indicates sucrose reduces the fluidity of geopolymer mortar, and in some cases, results in drier mixes. Sucrose demonstrates the ability to modulate workability when properly paired with adequate water content and sand of an appropriate fineness ensuring successful application in the 3DCP process. The findings offer valuable insights for future research and contribute to standardizing mix design methods for printable geopolymer mortars and concrete. This work aligns with broader initiatives to develop adaptable and alternative construction materials, specifically addressing challenges unique to 3DCP while promoting alternative materials that mitigate CO2 emissions.
description: Digital Concrete 2024 - Supplementary Proceedings
Enabling local actions for the Sustainable Development Goals
Creators: name: NINGRUM, DIANTY
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 460105
subject: Applications in social sciences and education
classificationCode: 440699
subject: Human geography not elsewhere classified

description: This thesis primarily discusses how a global sustainability agenda can work at the local level. This thesis specifically looks at the localisation of the Sustainable Development Goals (SDGs), a set of interlinked goals formulated by the United Nations to address global challenges. By offering a more comprehensive picture of the processes and enablers of local SDG actions, this thesis reveals the diversity of the ways that the SDGs can bring impact at the local level and how global-to-local sustainability governance can be enacted
Optimising statutory general environmental duties of care: Exploring the behavioural drivers for prevention in general duty implementation
Creators: name: EDWARDS, JOEL DAVID
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 480403
subject: Law and humanities
classificationCode: 350710
subject: Organisational behaviour

description: This thesis examines how regulators, implementing a new statutory general duty of care, can maximise the compliance of small or medium sized enterprises (SMEs), using Victoria’s general environmental duty as a case study. The thesis systematically reviews the existing literature to identify nine challenges in implementing statutory general duties, explores the challenges described by frontline compliance staff, and examines compliance behaviours of SMEs. While SMEs need tailored and bespoke tool combinations, frontline staff tend to operate in circumstances that drive the reflexive use of generic tool combinations. The thesis proposes six principles to overcome this disconnect.
title: Implementing the excess paste concept for a systematic mix design of printable concrete
Creators: name: Hanžič, Lucija
name: Šter, Katarina
name: Štefančič, Mateja
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: Concrete Mix Design
subject: Excess Paste
subject: Particle Packing
subject: Printable Concrete
subject: 62

description: The properties of concrete depend on a number of interrelated factors and for this reason, the mix design process is, to a significant extent, an educat-ed guess. Nevertheless, the choice of factors and implementation of multifactorial analysis can provide new insights into complex correlations. A factor, rarely adopted in the design of printable concrete, is the quantity of excess paste. Concrete can be considered a two-phase system comprising the aggregate and the cementitious paste. The paste required to fill the voids between the aggregate grains is the requisite paste. However, to coat the grains and form a cohe-sive mix the excess paste must be added which, in turn, increases the distances between aggregate particles. The volume fraction of excess paste is thus the principal factor in the design process. The second factor is the paste composi-tion. The paste consists of reactive and inert powders, water and soluble admix-tures. Although chemically reactive materials are necessary for binding, cohe-siveness can be achieved by inert particles while improved packing of particles also enhances the mechanical characteristics. The excess paste mix design is discussed on two modifications of a concrete mixture suitable for extrusion-based 3D printing. The necessary input data and the associated tests on aggregate and powders are presented. Additionally, a computerized, multi-factorial approach to mix design optimization is proposed.
description: Digital Concrete 2024 - Supplementary Proceedings
Behaviour-based safety approaches to workplace mental health: Investigating the role of psychosocial safety behaviour (PSB) in psychosocial risk mitigation & participatory intervention design
Creators: name: WEAVER, BODHI ELIJAH
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 350505
subject: Occupational and workplace health and safety
classificationCode: 420604
subject: Injury prevention
classificationCode: 440211
subject: Police administration, procedures and practice
classificationCode: 350710
subject: Organisational behaviour

description: This thesis examines the application of behaviour-based safety (BBS) approaches to improving psychosocial safety in the workplace. This body of research investigates the whole-of-workplace enactment of psychosocial safety behaviour in a road policing work environment and identifies the socio-cognitive, interpersonal and environmental antecedents of psychosocial safety intentions and actions. The findings of this thesis also contribute to the development of PSB interventions using a participatory approach to design, planning and implementation of context-specific initiatives.
title: Multi-objective optimization of a sustainable ternary mortar for 3D printing
Creators: name: Jin, Willy
name: Ouellet-Plamondon, Claudiane
name: Caron, Jean-François
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: Sustainability
subject: 3D printing
subject: LC3
subject: Optimization
subject: Machine learning
subject: 62

description: The construction industry is compelled to evolve toward industrial-ized and sustainable means and processes. Indeed, the Portland cement produc-tion alone is responsible for up to 8 % of global greenhouse gas emissions. In this context, concrete 3D printing demonstrates a significant potential for the reduction of material use. However, the majority of 3D printing materials dis-play a high cement content due to the rheological constraints associated with 3D printing along with the complexity of mix design. The present study proposes to integrate a parametric life cycle assessment cal-culation in the multi-objective optimization of a 3D printing mortar in order to minimize the environmental impact with a significantly reduced mix design workload. Applied to a limestone calcined clay blend, a genetic algorithm is used to decrease the climate change score while maintaining a set of rheological printability criteria predicted by artificial neural networks. As a result, this methodology allows the identification of locally optimized mixtures (up to 82wt% cement replacement) in as low as 9 additional formulations. Besides, as the process advances for an expanded design region, its efficiency is enhanced. This methodology is reproducible with locally sourced materials and for the majority of 3D printing materials, which are usually designed through empirical trial and error. This study introduces a systematic optimization process which establishes the sustainability at the core of its objectives and includes innovative tools for the formulation of cementitious materials.
description: Digital Concrete 2024 - Supplementary Proceedings
The New Kingdom Cemeteries at Gurob: Towards an Archaeology of Group Belonging in Ancient Egypt
Creators: name: LAKIN, TRACY JOAN
Publisher: name: Monash University
Year: 2023
Subjects: classificationCode: 430104
subject: Archaeology of Europe, the Mediterranean and the Levant

description: This thesis adopts a practice-based model to consider the extent to which the dynamic of group belonging can be identified in archaeological expressions of mortuary homogeneity and variation at New Kingdom Gurob. It explores how an 'archaeology of belonging’ may help connect the burial record of this ancient Egyptian settlement with more abstract notions of 'community'. This thesis offers scope for considering how early 20th century excavation data can be approached in a new light through the formulation and application of social practice-based methodologies.
title: Exploring Low-Carbon Cementitious Materials for 3D Printing Applications: A Comparison Between Limestone Calcined Clay Cement (LC3) And One-Part Alkai-Activated Material (AAM)
Creators: name: Al-Noaimat, Yazeed
name: Ghaffar, Seyed
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: LC3
subject: waste clay
subject: one-part alkali-activated materials
subject: end-of-life brick powder
subject: 62

description: The utilisation of low-carbon cement containing construction and dem-olition waste (CDW) in 3D printing has received significant attention as a suitable approach to conserve natural resources and reduce the carbon footprint of con-struction materials. This study introduces and compares the printability of two low-carbon systems, namely limestone calcined clay cement (LC3) and one-part alkali-activated materials (AAMs), containing excavated clay waste and end-of-life brick powder as binder materials, respectively. The developed systems’ flow-ability, open time, mechanical strength, shape retention and buildability were in-vestigated. The flowability of the mixtures was comparable and adequate for a smooth extrudability. The open time of the LC3 system was around four times higher than the one-part AAM. The study showed that one-part AAM has superior mechanical strength after 3 days, much higher than that of LC3 after 28 days. Both investigated systems of mix formulations had acceptable buildability, i.e., without rapture and tilting of the upper layers. Overall, the results present a promising application for using low-carbon cementitious materials as a feedstock for 3D printing applications. The culminated results suggest that LC3 formulation using excavated clay is best suited for medium to large-scale and one-part AAM using end-of-life brick for small to medium-scale objects. The outcome of this study can be crucial in decreasing the overdependence on limited resources and allowing construction automation.
description: Digital Concrete 2024 - Supplementary Proceedings
El testimonio del fruto: los acontecimientos apilados a partir del pensamiento de Jean Luc Marion
Creators: name: Novoa, Francisco
Publisher: name: figshare
Year: 2023
Subjects: Phenomenology

description: El presente trabajo se enmarca en la propuesta fenomenológica de Jean Luc Marion, comenzando por la crítica que él realiza a Husserl y Heidegger. Luego de adentrarnos en lo fundamental de su propuesta fenomenológica, ‘cuanto de reducción, tanto de donación’, podremos acercarnos a comprender la llamada que genera y su fenomenalización por medio de la respuesta que se apila en nuestra carne. Frente a lo propuesto por Marion, esperamos encontrar una posibilidad de acercarnos a indicios del pensamiento filosófico de Cristo sobre el rol del tercero y su testimonio. El trabajo se centra, por lo tanto, en los rastros que nos deja el pensamiento de Cristo, que puede ser esbozado a partir de una escapatoria al pensamiento griego.
Homodyne-detected ferromagnetic resonance of in-plane magnetized nano-contacts: composite spin wave resonances and their excitation mechanism
Creators: name: Fazlali, Masoumeh
name: Dvornik, Mykola
name: Iacocca, Ezio
name: Dürrenfeld, Philipp
name: Haidar, Mohammad
name: Åkerman, Johan
name: Dumas, R. K.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: This work provides a detailed investigation of the measured in-plane field-swept homodyne-detected ferromagnetic resonance (FMR) spectra of an extended Co/Cu/NiFe pseudo spin valve stack using a nanocontact (NC) geometry. The magnetodynamics are generated by a pulse-modulated microwave current and the resulting rectified dc mixing voltage, which appears across the NC at resonance, is detected using a lock-in amplifier. Most notably, we find that the measured spectra of the NiFe layer are composite in nature and highly asymmetric, consistent with the broadband excitation of multiple modes. Additionally, the data must be fit with two Lorentzian functions in order to extract a reasonable value for the Gilbert damping of the NiFe. Aided by micromagnetic simulations, we conclude that (i) for in-plane fields the rf Oersted field in the vicinity of the NC plays the dominant role in generating the observed spectra, (ii) in addition to the FMR mode, exchange dominated spin waves are also generated, and (iii) the NC diameter sets the mean wavevector of the exchange dominated spin wave, in good agreement with the dispersion relation.
description: 7 pages, 7 figures
title: Advancements in sustainability of 3D concrete printing: Presenting low-carbon mixtures for additively manufactured concrete structures in practice
Creators: name: Colyn, ML
name: Babafemi, AJ
name: van Zijl, GPAG
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: 3D concrete printing
subject: Sustainability
subject: Low-carbon materials
subject: Real-world applicability
subject: Structural requirements
subject: 62

description: 3D concrete printing (3DCP) is regarded as an environmentally friendly construction technique with minimum waste generation. However, challenges persist, particularly in the composition of 3D printable concrete mixtures. The need for specific rheological properties and printer system resolutions have led to a higher volume fraction of binder materials compared to conventional concrete. This in turn, poses challenges to the environmental and economic sustainability of 3DCP. The scientific community is actively addressing these concerns by striving to enhance 3D printable concrete mixtures. The focus is on replacing traditional components such as ordinary Portland cement and natural aggregates with more sustainable alternatives such as supplementary cementitious materials, sourced from diverse waste streams, and construction and demolition waste. Researchers are developing innovative 3D printable concrete mixtures that incorporate locally available low-carbon materials. The primary goal is to achieve the necessary rheological properties for 3D printing while mitigating the environmental impact associated with high cement content. By exploring alternative materials and optimising mix designs, the scientific community aims to strike a balance between the structural requirements of 3DCP and the imperative for environmentally responsible construction practices. This study assesses the practical feasibility of different low-carbon 3D printable concrete formulations identified in existing literature. Our investigation focuses on crucial factors such as strength requirements, material costs, and the carbon footprint associated with these concrete mixes. The methodology involves evaluating the reported strengths of various low-carbon 3D printable concrete formulations from existing literature and calculating the corresponding reduced carbon footprint. The study aims to evaluate the practicality of these formulations in real-world scenarios, particularly when compared to the specifications set by completed projects that have already utilised 3DCP for structural components. In conclusion, ongoing advancements in 3DCP materials suggest a trajectory toward reduced costs and carbon footprints, closing in on conventional concrete.
description: Digital Concrete 2024 - Supplementary Proceedings
Litocampa espanoli
Creators: name: Sendra, Alberto
name: Reboleira, Ana Sofia P. S.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Diplura
Campodeidae
Litocampa
Litocampa espanoli

description: Litocampa aff. espanoli (Condé, 1949)
Differential diagnosis from the f. typ. (Condé, 1982b)
Shorter body; antennae with 25–41 antennomeres; and first urosternite of males with glandular g 1 -setae.
Habitat and distribution
Cave-dwelling species well spread from the Basque to the Cantabrian Mountains, Spain (Condé 1982b).
description: Published as part of Sendra, Alberto & Reboleira, Ana Sofia P. S., 2020, Euro-Mediterranean fauna of Campodeinae (Campodeidae, Diplura), pp. 1-130 in European Journal of Taxonomy 728 on page 100, DOI: 10.5852/ejt.2020.728.1181, http://zenodo.org/record/4316883
Certificate of Marriage for Nicolas Abkhazi and Peggy Pemberton-Cater
Creators: name: British Columbia. Division Of Vital Statistics
Publisher: name: University of Victoria Libraries
Year: 2020
Subjects: subject: Marriage
valueUri: http://id.worldcat.org/fast/1010443
subject: Marriage records
valueUri: http://id.worldcat.org/fast/1010631
subject: Abkhazi, Nicolas, 1899-1987

description: A marriage certificate for Nicolas Abkhazi and Peggy Pemberton-Cater in 1946. On the verso there are stamps of various companies [possibly companies to which the certificate was circulated in order to have Peggy Abkhazi’s change of name registered as a stock holder].
Area Spectral Efficiency Analysis and Energy Consumption Minimization in Multi-Antenna Poisson Distributed Networks
Creators: name: Chen, Zheng
name: Qiu, Ling
name: Liang, Xiaowen
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: This paper aims at answering two fundamental questions: how area spectral efficiency (ASE) behaves with different system parameters; how to design an energy-efficient network. Based on stochastic geometry, we obtain the expression and a tight lower-bound for ASE of Poisson distributed networks considering multi-user MIMO (MU-MIMO) transmission. With the help of the lower-bound, some interesting results are observed. These results are validated via numerical results for the original expression. We find that ASE can be viewed as a concave function with respect to the number of antennas and active users. For the purpose of maximizing ASE, we demonstrate that the optimal number of active users is a fixed portion of the number of antennas. With optimal number of active users, we observe that ASE increases linearly with the number of antennas. Another work of this paper is joint optimization of the base station (BS) density, the number of antennas and active users to minimize the network energy consumption. It is discovered that the optimal combination of the number of antennas and active users is the solution that maximizes the energy-efficiency. Besides the optimal algorithm, we propose a suboptimal algorithm to reduce the computational complexity, which can achieve near optimal performance.
description: Submitted to IEEE Transactions on Wireless Communications, Major Revision
title: Early-age Shrinkage Measurement in 3D Printed Con-crete by Digital Image Correlation – Influence of Spray Paints
Creators: name: Kurup, Divya
name: Rahul, A.
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: 3D concrete printing
subject: early-age shrinkage
subject: digital image correlation
subject: spray paints
subject: isothermal calorimetry
subject: mass loss
subject: 62

description: 3D concrete printing is the most popular automation technique in the construction industry. One notable concern while using 3D-concrete printing is the early-age shrinkage. Early-age shrinkage can be assessed by digital image correlation (DIC) techniques, which work by creating a high-contrast grayscale pattern on the sample surface, usually obtained by using black and white spray paints. This study examines the effect of different spray paints used for performing early-age shrinkage measurements using DIC. Spray paint of black and white colors made of different materials (chalk and acrylic) was applied on the surface of the fresh 3D-printed concrete prism samples. The free shrinkage for the first 6 hours after casting was determined by tracking the movements of marker pins by using a subpixel-based MATLAB program. In addition, the mass loss of the sample was also monitored. The results indicate that chalk-based paints reduce evaporation at very early ages (within 120 minutes from the onset of casting), while acrylic-based paints significantly influence the latter-age shrinkage (beyond 45 minutes from the onset of casting). The spray paints applied on the sample surface may also modify the hydration rate of near-surface concrete. To assess the impact on cement hydration, isothermal calorimetry studies were performed by mixing spray paints at a dosage of 1% binder content. The results show that black acrylic-based paint delays and reduces the main hydration peak and, therefore, may influence the autogenous shrinkage behaviour. This study indicates that attention should be paid to the type of spray paint being used (both color and material) while performing early-age shrinkage measurements using DIC.
description: Digital Concrete 2024 - Supplementary Proceedings
Automated Pipelines for Spectroscopic Analysis
Creators: name: Prieto, Carlos Allende
Publisher: name: arXiv
Year: 2016
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Gaia mission will have a profound impact on our understanding of the structure and dynamics of the Milky Way. Gaia is providing an exhaustive census of stellar parallaxes, proper motions, positions, colors and radial velocities, but also leaves some flaring holes in an otherwise complete data set. The radial velocities measured with the on-board high-resolution spectrograph will only reach some 10% of the full sample of stars with astrometry and photometry from the mission, and detailed chemical information will be obtained for less than 1%. Teams all over the world are organizing large-scale projects to provide complementary radial velocities and chemistry, since this can now be done very efficiently from the ground thanks to large and mid-size telescopes with a wide field-of-view and multi-object spectrographs. As a result, automated data processing is taking an ever increasing relevance, and the concept is applying to many more areas, from targeting to analysis. In this paper, I provide a quick overview of recent, ongoing, and upcoming spectroscopic surveys, and the strategies adopted in their automated analysis pipelines.
description: 7 pages, 1 figure. To appear in Astronomische Nachrichten, special issue "Reconstruction the Milky Way's History: Spectroscopic surveys, Asteroseismology and Chemo-dynamical models", Guest Editors C. Chiappini, J. Montalban, and M. Steffen, AN 2016 (in press)
Technical documentation for contributing to BBMRI-ERIC CRC-Cohort
Creators: name: Proynova, Rumyana
name: Ataian, Maxmilian
name: Törnwall, Outi
name: Holub, Petr
Publisher: name: Zenodo
Year: 2023

description: Documentation of data import format (CRC-Cohort-import-XML-docs.pdf) Synthetic data example (import_example.xml) Strict validation XSD (strict_import_twoSpace.xsd) Relaxed validation XSD (import_twoSpace.xsd)
title: Influence of temperature variations on the performance of two-component 3D printable mixtures
Creators: name: Mohan, Manu
name: Tao, Yaxin
name: De Schutter, Geert
name: Van Tittelboom, Kim
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: 3D concrete printing
subject: calcium sulfoaluminate cement
subject: temperature changes
subject: yield stress
subject: 62

description: Digital Concrete 2024 - Supplementary Proceedings
title: Development of low-cement lightweight concrete mixes for 3D extrusion printing
Creators: name: Obermeier, Nico
name: Brunner, Kim
name: Wiese, Felix
name: Stengel, Thorsten
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: Additive Manufacturing
subject: 3D printing
subject: Extrusion
subject: Lightweight ag-gregate concrete
subject: Low cement
subject: 62

description: Additive Manufacturing (AM) continues to advance in the construc-tion industry, offering considerable potential. One of AM's advantages lies in eliminating the need for formwork, allowing for the realization of highly complex structures. Combining this innovative technology with the development of spe-cific material compositions can achieve more efficient building construction. The paper aims to develop a material for 3D extrusion printing, facilitating the crea-tion of thermally improved, multifunctional, and sustainable building elements. The development is carried out with a focus on the sustainable use of the tech-nology, which primarily requires reducing the cement content. Therefore, a pack-ing density approach is applied to optimize cement efficiency. In addition, an aggregate with a particle size of up to 8 mm is used. Lightweight aggregates (LWA) in specific grain groups will be incorporated to improve the insulating properties of the building parts. To validate applicability in 3D printing, the de-veloped mixtures are tested in practical applications. Furthermore, compressive strength tests provide insights into subsequent load-bearing capacity.
description: Digital Concrete 2024 - Supplementary Proceedings
Retrograde binaries of massive black holes in circum-binary accretion discs
Creators: name: Amaro-Seoane, Pau
name: Maureira-Fredes, Cristián
name: Dotti, Massimo
name: Colpi, Monica
Publisher: name: arXiv
Year: 2016
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We explore the hardening of a massive black hole binary embedded in a circum-binary gas disc when the binary and the gas are coplanar and the gas is counter-rotating. The secondary black hole, revolving in the direction opposite to the gas, experiences a drag from gas-dynamical friction and from direct accretion of part of it. Using two-dimensional (2D) hydrodynamical grid simulations we investigate the effect of changing the accretion prescriptions on the dynamics of the secondary black hole which in turn affect the binary hardening and eccentricity evolution. We find that realistic accretion prescriptions lead to results that differ from those inferred assuming accretion of all the gas within the Roche Lobe of the secondary black hole. Different accretion prescriptions result in different disc's surface densities which alter the black hole's dynamics back. Full 3D SPH realizations of a number of representative cases, run over a shorter interval of time, validate the general trends observed in the less computationally demanding 2D simulations. Initially circular black hole binaries increase only slightly their eccentricity which then oscillates around small values (<0.1) while they harden. By contrast, initially eccentric binaries become more and more eccentric. A semi-analytical model describing the black hole's dynamics under accretion only explores the late evolution stages of the binary in an otherwise unperturbed retrograde disc to illustrate how eccentricity evolves with time in relation to the shape of the underlying surface density distribution.
description: Abstract abridged. Accepted for publication A&A
title: Exploring Locust Bean Gum as a Robust Binder and Rheology Modifier for Earth Concrete
Creators: name: Maierdan, Yierfan
name: Armistead, Samuel
name: Mikofsky, Rebecca
name: Carcassi, Olga
name: Ben-Alon, Lola
name: Srubar, Wil
name: Kawashima, Shiho
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: Additive manufacturing
subject: clay
subject: kaolinite
subject: earth-based materials
subject: biopolymer
subject: 62

description: Digital Concrete 2024 - Supplementary Proceedings
British Columbia Legislative Assembly sessional clipping book (1961-08)
Creators: name: :Unav
Publisher: name: University of Victoria Libraries
Year: 2022
Subjects: subject: British Columbia. Legislative Assembly
valueUri: http://id.worldcat.org/fast/600765
subject: Law
valueUri: http://id.worldcat.org/fast/993678
subject: FOS: Law
subject: Politics and government
valueUri: http://id.worldcat.org/fast/1919741

description: These Sessional Clippings books cover the period 1891 to 1972, and include newspaper accounts written by various legislative reporters who covered debates occurring in the British Columbia Legislative Assembly. Transcripts of debates of the Legislative Assembly (Hansard) were not published in B.C. until 1970; hence these "Sessional Clipping Books" augment the "Journals", the record of daily proceedings of the Legislative Assembly. Selected clippings from various newspapers including the Vancouver Sun, the Vancouver Province, the Colonist, and the Times newspapers, relating to the newspaper reports concerning activities of the Legislature. The original sessional clippings books comprise 351 ledger size print volumes, held at the Legislative Library in Victoria BC. The print volumes were microfilmed onto 26 reels in 1977 under a Tri University Libraries (TRIUL) project by Precision Micrographic Services (Vancouver, B.C.), with the permission of the Legislative Library, Victoria, British Columbia. This digital collection was created by scanning the 26 microfilm reels.
Breather transition dynamics, Peregrine combs/walls and modulation instability in a variable-coefficient nonlinear Schrödinger equation with higher-order effects
Creators: name: Wang, Lei
name: Zhang, Jian-Hui
name: Liu, Chong
name: Li, Min
name: Qi, Feng-Hua
Publisher: name: arXiv
Year: 2016
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study a variable-coefficient nonlinear Schrödinger (vc-NLS) equation with higher-order effects. We show that the breather solution can be converted into four types of nonlinear waves on constant backgrounds including the multi-peak solitons, antidark soliton, periodic wave and W-shaped soliton. The transition condition requiring the group velocity dispersion (GVD) and third-order dispersion (TOD) to scale linearly is obtained analytically. We display several kinds of elastic interactions between the transformed nonlinear waves. We discuss the dispersion management of multi-peak soliton, which indicates that the GVD coefficient controls the number of peaks of the wave while the TOD coefficient has compression effect. The gain or loss has influence on the amplitudes of the multi-peak soliton. We further derive the breather multiple births by using multiple compression points of Akhmediev breathers in optical fiber systems with periodic dispersion. The number of ABs depends on the amplitude of the modulation but not on its wavelength, which affects their separation distance. In the limiting case, the breather multiple births reduce to the Peregrine combs. We discuss the effects of TOD coefficient on the spatiotemporal characteristics of Peregrine combs. When the amplitude of the modulation is equal to 1, the Peregrine comb is converted into a Peregrine wall that can be seen as intermediate state between rogue wave and W-shaped soliton. We finally find that the modulational stability regions with zero growth rate coincide with the transition condition using rogue wave eigenvalues. Our results could be useful for the experimental control and manipulation of the formation of generalized Peregrine rogue waves in diverse physical systems modeled by vc-NLS equation with higher-order effects.
title: Fine Recycled Concrete Aggregates in 3D Printed Concrete
Creators: name: Sikora, Pawel
name: Federowicz, Karol
name: Techman, Mateusz
name: Skibicki, Szymon
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: 3D concrete printing
subject: recycled concrete
subject: recycled fine aggregate
subject: recycled fines
subject: fresh properties
subject: 62

description: This study aims to develop a 3DPC containing fine recycled concrete aggregates (fRA) and recycled concrete fines. In the first part, methodology of fRA incorporation method was evaluated. Concurrently, the effect of recycled materials was evaluated in the scope of the hydration and hardening processes of the material using isothermal calorimetry and ultrasonic testing. Afterwards, the impact of recycled materials was assessed in terms of their performance on key fresh properties of 3DPC, including rheology, green strength, and early-age shrinkage. Study showed that the most efficient fRA incorporation method is addition of 100% water of absorption. Despite slightly delayed hydration pro-cess in presence of additional water the material exhibits sufficient performance during deposition phase. Overall, it was found that intermediate (50 vol.%) and full replacement levels (100 vol.%) of natural aggregate with fRA and cement with recycled fines (10 vol.%) in 3DPC can be effective with minor mixture modification and ensure satisfactory performance of the material.
description: Digital Concrete 2024 - Supplementary Proceedings
Diffusion of a nano-wire through an obstacle field
Creators: name: Kasimov, Dror
name: Admon, Tamir
name: Roichman, Yael
Publisher: name: arXiv
Year: 2016
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We report the first experimental realization of a rod diffusing in a two dimensional obstacle field following the single rod dynamics. We use a silver nanowire as our rod and two types of obstacles: repelling light beams and polymer pillars. We study the effect of hydrodynamic interactions on the transport of the rod, comparing both experimental realizations and recent simulations. We propose a new framework for analyzing the transport through such systems and predict a new superdiffusive regime of rod transport at high obstacle concentration and short times.
description: 5 pages, 5 figures, in press in PRE rapid communications, 2016
title: Analysis of the Effect of Substituting Cement With Marble Powder on the Mortar Characteristics Used in 3D Printing
Creators: name: Zargayouna, Habib
name: Paquet, Elodie
name: Mabrouki, Tarek
name: Hamdi, Essaieb
name: Furet, Benoit
Publisher: name: Universitätsbibliothek Braunschweig
Year: 2024
Subjects: subject: 3D printing
subject: marble powder
subject: cement
subject: civil construction
subject: constrution waste recycling
subject: 62

description: The aim of this research is to experimentally study the valorisation and recycling of cut and processing waste marble by partially substituting ce-ment in mortars during 3D printing in civil engineering. The case study con-cerns the use of Tunisian marble powder as a mineral material to replace ce-ment in the formulation of a printable cementitious material. The aim is to con-tribute to the reduction of the carbon footprint of mortars in addition to the ma-terial gains already provided by 3D printing. For that, cement was substituted with 15% marble powder by mass, investigating its impact on mortar properties. The study examined marble powder's particle morphology effects on printabil-ity and tested compressive/flexural strengths of different formulations. Results showed improved workability and short-term compressive strength with marble powder substitution. Utilizing marble powder as a cement substitute offers a sustainable solution, reducing cement consumption without loosing perfor-mance.
description: Digital Concrete 2024 - Supplementary Proceedings
The Diphoton and Diboson Excesses in a Left-Right Symmetric Theory of Dark Matter
Creators: name: Berlin, Asher
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We explore the possibility that the recently reported diphoton excess at ATLAS and CMS can be accommodated within a minimal extension of a left-right symmetric model. Our setup is able to simultaneously explain the Run 2 diphoton and Run 1 diboson excesses, while providing a standard thermal freeze-out of weak-scale dark matter. In this scenario, the 750 GeV neutral right-handed Higgs triplet is responsible for the diphoton excess. Interactions of this state with the neutral and charged components of dark matter multiplets provide the dominant mechanisms for production and decay. A striking signature of this model is the additional presence of missing energy in the diphoton channel.
description: 19 pages, 3 figures
Phase Transition in Loop Quantum Gravity
Creators: name: Mäkelä, Jarmo
Publisher: name: arXiv
Year: 2016
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We point out that with a specific counting of states loop quantum gravity implies that black holes perform a phase transition at a certain characteristic temperature $T_C$. In this phase transition the punctures of the spin network on the stretched horizon of the black hole jump, in effect, from the vacuum to the excited states. The characteristic temperature $T_C$ may be regarded as the lowest possible temperature of the hole. From the point of view of a distant observer at rest with respect to the hole the characteristic temperature $T_C$ corresponds to the Hawking temperature of the hole.
description: 7 pages, no figures, published in the Physical Review D. Comments welcome