cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Radial oscillations and gravitational wave echoes of strange stars for various equations of state
Creators: name: Bora, Jyatsnasree
name: Goswami, Umananda Dev
Publisher: name: arXiv
Year: 2020
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the radial oscillations of non-rotating strange stars and their characteristic echo frequencies for three Equations of state (EoSs), viz., MIT Bag model EoS, linear EoS and polytropic EoS. The frequencies of radial oscillations of these compact stars are computed for these EoSs. 22 lowest radial frequencies for each of these three EoSs have been computed. First, for each EoS, we have integrated Tolman-Oppenheimer-Volkoff (TOV) equations numerically to calculate the radial and pressure perturbations of strange stars. Next, the mass-radius relationships for these stars are obtained using these three EoSs. Then the radial frequencies of oscillations for these EoSs are calculated. Further, the characteristic gravitational wave echo frequencies and the repetition of echo frequencies of strange stars are computed for these EoSs. Our numerical results show that the radial frequencies and also echo frequencies vastly depend on the model and on the value of the model parameter. Our results also show that, the radial frequencies of strange stars are maximum for polytropic EoS in comparison to MIT Bag model EoS and linear EoS. Moreover, strange stars with MIT Bag model EoS and linear EoS are found to emit gravitational wave echoes. Whereas, strange stars with polytropic EoS are not emitting gravitational wave echoes.
description: 15 pages, 13 figures, published version in MNRAS
Effectiveness of Social Media Marketing in the Georgian Consumer Market
Creators: name: Makharadze, Ana
name: Mamuladze, Gela
Publisher: name: Georgian Maritime Scientific Journal
Year: 2021

description: In today's digital world, traditional marketing is increasingly being integrated with high technology and Internet resources. The digitalization of global and local markets has put on the agenda an overview of practical marketing mechanisms and the search for new approaches. Traditional marketing communication tools and channels such as advertising, direct marketing, promotion, personal selling, catalogs, etc. They are gradually integrated with Internet marketing trends and are used more or less in a comprehensive manner. This article discusses the Social Media Marketing development stages, the key platforms, the tools used, and their impact on the consumer market. As with traditional marketing, the effectiveness of social media marketing is determined by the nature of consumer markets and their awareness of a particular marketing event. The article also discusses marketing trends used in the Georgian consumer market and customer reviews in the same market.
description: Georgian Maritime Scientific Journal, Vol. 1 No. 1 (2021): Georgian Maritime Scientific Journal
Hidden Markov models : multiple processes and model selection
Creators: name: MacKay, Rachel J.
Publisher: name: University of British Columbia
Year: 2009

description: This thesis considers two broad topics in the theory and application of hidden Markov models (HMMs): modelling multiple time series and model selection. Of particular interest is the application of these ideas to data collected on multiple sclerosis patients. Our results are, however, directly applicable to many different contexts in which HMMs are used. One model selection issue that we address is the problem of estimating the number of hidden states in a HMM. We exploit the relationship between finite mixture models and HMMs to develop a method of consistently estimating the number of hidden states in a stationary HMM. This method involves the minimization of a penalized distance function. Another such issue that we discuss is that of assessing the goodness-of-fit of a stationary HMM. We suggest a graphical technique that compares the empirical and estimated distribution functions, and show that, if the model is misspecified, the proposed plots will signal this lack of fit with high probability when the sample size is large. A unique feature of our technique is the plotting of both the univariate and multivariate distribution functions. HMMs for multiple processes have not been widely studied. In this context, random effects may be a natural choice for capturing differences among processes. Building on the framework of generalized linear mixed models, we develop the theory required for implementing and interpreting HMMs with random effects and covariates. We consider the case where the random effects appear only in the conditional model for the observed data, as well as the more difficult setting where the random effects appear in the model for the hidden process. We discuss two methods of parameter estimation: direct maximum likelihood estimation and the EM algorithm. Finally, to determine whether the additional complexity introduced by the random effects is warranted, we develop a procedure for testing the significance of their variance components. We conclude with a discussion of future work, with special attention to the problem of the design and analysis of multiple sclerosis clinical trials.
Intricacies of classical de Sitter string backgrounds
Creators: name: Andriot, David
name: Marconnet, Paul
name: Wrase, Timm
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Up-to-date, there is no known example of a classical de Sitter solution of string theory, despite several good candidates. We consider here two newly discovered 10d supergravity de Sitter solutions, and analyse in great detail whether they can be promoted to classical string backgrounds. To that end, we identify five requirements to be met, and develop the necessary 10d tools to test the solutions. Eventually, they both fail to verify simultaneously all requirements, in spite of positive partial results. The explicit values obtained offer a clear illustration of the situation, and the analysis highlights various subtleties. We finally discuss the relation to the problem of scale separation.
description: 9 pages; v2: few additions on scale separation; v3: small additions, published version
Discrete solitons in zigzag waveguide arrays with different types of linear mixing between nearest-neighbor and next-nearest-neighbor couplings
Creators: name: Hu, Jinzhou
name: Li, Shulan
name: Chen, Zhaopin
name: Lu, Jiantao
name: Liu, Bin
name: Li, Yongyao
Publisher: name: arXiv
Year: 2020
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: We study discrete solitons in zigzag discrete waveguide arrays with different types of linear mixing between nearest-neighbor and next-nearest-neighbor couplings. The waveguide array is constructed from two layers of one-dimensional (1D) waveguide arrays arranged in zigzag form. If we alternately label the number of waveguides between the two layers, the cross-layer couplings (which couple one waveguide in one layer with two adjacent waveguides in the other layer) construct the nearestneighbor couplings, while the couplings that couple this waveguide with the two nearest-neighbor waveguides in the same layer, i.e., self-layer couplings, contribute the next-nearest-neighbor couplings. Two families of discrete solitons are found when these couplings feature different types of linear mixing. As the total power is increased, a phase transition of the second kind occurs for discrete solitons in one type of setting, which is formed when the nearest-neighbor coupling and next-nearest-neighbor coupling feature positive and negative linear mixing, respectively. The mobilities and collisions of these two families of solitons are discussed systematically throughout the paper, revealing that the width of the soliton plays an important role in its
description: 8 pages, 8 figures,to be published in Physics Letters A
The Effects of Children's Time Use and Home and Neighborhood Quality on their Body Weight and Cognitive/Behavioral Development
Creators: name: Agee, Mark D.
name: Atkinson, Scott E.
name: Crocker, Thomas D.
name: Agee, Mark D.
name: Atkinson, Scott E.
name: Crocker, Thomas D.
Publisher: name: Unknown
Year: 2010
Subjects: Health Economics and Policy
Labor and Human Capital

description: We estimate a directional distance function to assess the impacts of multiple time-varying parent and child inputs on a cluster of jointly produced child outcomes for children aged 7 to 13 years. The directional distance function specification avoids several well-known empirical problems associated with analysis of household production data, namely, the need to aggregate inputs and outputs, assume separability among inputs and outputs, or estimate reduced form equations. Using a balanced panel of families from the National Longitudinal Survey of Youth-Child Sample for 1996 to 2000, we assess the marginal contributions of home and neighborhood environmental quality and children's time allocations, on their math and reading performance, behavior problems, and body mass index. We also measure productivity growth, technical change, efficiency change, and technical efficiency for production of child outcomes. Our results indicate significant jointness among good and bad child outcomes. Significant improvements in children's good outcomes and reductions in bad outcomes are also associated with a better home and parent perceived neighborhood environment, Head Start participation, and increased family time spent together during meals. Children's productivity growth is found to be highest at age 8 years and diminishes thereafter.
BioReCer Deliverable D8.1 – Communication and Dissemination Plan
Creators: name: Banduka, Dušica
name: Schwarzenberger, Anke
Publisher: name: Zenodo
Year: 2023

description: The Communication and Dissemination Plan (CDP, D8.1) presents a strategy to impactfully address identified stakeholder and target groups. The communication and dissemination plan includes activities, channels and instruments for communication and dissemination that the consortium will use in order to ensure high visibility, information accessibility and effective promotion of the project and generated results throughout the entire project duration. In this context, the CDP will serve as a guideline and reference framework to guide and evaluate the impact of communication and dissemination activities that have been carried out. This will be achieved by identifying suitable key performance indicators (KPIs). Should the taken measures fail to meet the defined communication and dissemination goals, the plan will introduce alternative paths and solutions. The CDP will be continuously updated and adjusted with progressing project status and will inform about the executed measures.
Cruise Tourism in a Pandemic Reality: The End of the Industry or Not?
Creators: name: Melikjanyan, Karina
Publisher: name: Georgian Maritime Scientific Journal
Year: 2021

description: The following research work aims at analyzing coronavirus disease impact on cruise industry. The study provides a general overview of the sector before the crisis, as well as current Covid-19 pandemic situation and suggests possible post pandemic evolution of the industry. The findings show that despite the biggest crisis in the sector, the business is too successful to go down and sink under the pressure of financial problems. Even bad publicity of cruises is going to be temporary. According to 2020 CLIA Report 82% of cruise travelers are likely to cruise again. The fact testifies to the high attractiveness of the cruises. Another ‘pro’ is a positive attitude tendency of society about cruising. [1].
description: Georgian Maritime Scientific Journal, Vol. 1 No. 1 (2021): Georgian Maritime Scientific Journal
The entropy multiparticle-correlation expansion for a mixture of spherical and elongated particles
Creators: name: Prestipino, S.
name: Giaquinta, P. V.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We derive the multiparticle-correlation expansion of the excess entropy of classical particles in the canonical ensemble using a new approach that elucidates the rationale behind each term in the expansion. This formula provides the theoretical framework for an entropy-based ordering criterion that has been already tested for a variety of model fluids and thermodynamic phenomena. In view of future investigations of the phase diagram of colloidal mixtures, we detail in this paper the case of a two-component system of spherical and rod-like particles and discuss the symmetries underlying both the self and distinct pair-distribution functions under various geometrical constraints.
description: 23 pages, 1 figure
Impact of network characteristics on network reconstruction
Creators: name: Cecchini, Gloria
name: Cestnik, Rok
name: Pikovsky, Arkady
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: When a network is inferred from data, two types of errors can occur: false positive and false negative conclusions about the presence of links. We focus on the influence of local network characteristics on the probability $α$ - of type I false positive conclusions, and on the probability $β$ - of type II false negative conclusions, in the case of networks of coupled oscillators. We demonstrate that false conclusion probabilities are influenced by local connectivity measures such as the shortest path length and the detour degree, which can also be estimated from the inferred network when the true underlying network is not known a priory. These measures can then be used for quantification of the confidence level of link conclusions, and for improving the network reconstruction via advanced concepts of link thresholding.
Composite and Nanocomposite Materials: Advanced Solutions in Aircraft Construction
Creators: name: Hridoy Biswas
name: Md Ashiqur Rahman Laskar
name: G. M. Shashi
Publisher: name: figshare
Year: 2020
Subjects: subject: 91202 Composite and Hybrid Materials
subject: FOS: Materials engineering

description: Composite materials are preferred for many reasons such as being stronger, lighter and corrosion resistive etc. in comparison to traditional materials. Nowadays they are gaining more and more importance in aerospace industry. This paper presents different applications of composites in aircraft manufacturing with their particular advantages. It also identifies the corresponding limitations and future scopes to improve. Apart from these, a brief review of nano-structured Radar absorbing materials is highlighted.
Attribute processing in environmental choice analysis: implications for willingness to pay
Creators: name: Campbell, Danny
name: Lorimer, Victoria
name: Aravena, Claudia
name: Hutchinson, W. George
name: Campbell, Danny
name: Lorimer, Victoria
name: Aravena, Claudia
name: Hutchinson, W. George
Publisher: name: Unknown
Year: 2010
Subjects: subject: Environmental Economics and Policy
subject: Attribute processing strategies
subject: environmental restoration
subject: equality constrained latent class model
subject: multinomial logit model
subject: willingness to pay

description: Data from a discrete choice experiment is used to investigate the implications of failing to account for attribute processing strategies (APSs). The research was designed to elicit the economic benefits associated with landscape restoration activities that were intended to remediate environmental damage caused by illegal dumping activities. In this paper we accommodate APSs using an equality constrained latent class model. By retrieving the conditional class membership probabilities we recover estimates of the weights that each respondent assigned to each attribute, which we subsequently use ensure unnecessary weight is not allocated to attributes not attended to by respondents. Results from the analysis provide strong evidence that significant gains in models fit as well as more defensible and reliable willingness to pay estimates can be achieved using when the APSs are accounted for.
Gas and dust cooling along the major axis of M33 (HerM33es) -- Herschel/PACS [CII] and [OI] observations
Creators: name: Kramer, Carsten
name: Nikola, Thomas
name: Anderl, Sibylle
name: Bertoldi, Frank
name: Boquien, Mederic
name: Braine, Jonathan
name: Buchbender, Christof
name: Combes, Francoise
name: Henkel, Christian
name: Hermelo, Israel
name: Israel, Frank
name: Relano, Monica
name: Roellig, Markus
name: Schuster, Karl
name: Tabatabaei, Fatemeh
name: van der Tak, Floris
name: Verley, Simon
name: van der Werf, Paul
name: Wiedner, Martina
name: Xilouris, Emmanuel
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: M33 is a gas rich spiral galaxy of the Local Group. We investigate the relationship between the two major gas cooling lines and the total infrared (TIR) dust continuum. We mapped the emission of gas and dust in M33 using the far-infrared lines of [CII] and [OI](63um) and the TIR. The line maps were observed with Herschel/PACS. These maps have 50pc resolution and form a ~370pc wide stripe along its major axis covering the sites of bright HII regions, but also more quiescent arm and inter-arm regions from the southern arm at 2kpc galacto-centric distance to the south out to 5.7kpc distance to the north. Full-galaxy maps of the continuum emission at 24um from Spitzer/MIPS, and at 70um, 100um, and 160um from PACS were combined to obtain a map of the TIR. TIR and [CII] intensities are correlated over more than two orders of magnitude. The range of TIR translates to a range of far ultraviolet (FUV) emission of G0,obs~2 to 200 in units of the average Galactic radiation field. The binned [CII]/TIR ratio drops with rising TIR, with large, but decreasing scatter. Fits of modified black bodies (MBBs) to the continuum emission were used to estimate dust mass surface densities and total gas column densities. A correction for possible foreground absorption by cold gas was applied to the [OI] data before comparing it with models of photon dominated regions (PDRs). Most of the ratios of [CII]/[OI] and ([CII]+[OI])/TIR are consistent with two model solutions. The median ratios are consistent with one solution at n~2x10^2 cm-3, G0~60, and and a second low-FUV solution at n~10^4 cm-3, G0~1.5. The bulk of the gas along the lines-of-sight is represented by a low-density, high-FUV phase with low beam filling factors ~1. A fraction of the gas may, however, be represented by the second solution.
description: Accepted for publication in Astronomy & Astrophysics
Heat Transfer of Pulsating Turbulent Flow in Pipes
Creators: name: Rajib Uddin Rony
name: Md Nahid Hasan
name: Md Ashiqur Rahman Laskar
Publisher: name: figshare
Year: 2020
Subjects: subject: 91502 Computational Heat Transfer
subject: FOS: Other engineering and technologies

description: Pulsating flow has a significant impact on heat and mass transfer in sterling engines, electronic cooling, nuclear
reactors, gas turbines, and arterial blood flow. Flow characteristics of pulsating flows in different channels have
received extensive attention in recent years. The effects of the pulsation amplitude and frequency, the Prandtl number
and Reynolds number on heat transfer are characterized by variation in temperature, heat flux, and Nusselt number. In
this study, pulsating turbulent flow in a pipe is analyzed using a transient ANSYS CFX simulation. The results are plotted
against time and discussed considering different flow conditions such as pulsating frequency, amplitude, Reynolds
number and Prandtl number to analyze the effect on heat transfer.
1169: Sgt William Beardwood (photograph)
Creators: name: Project Team, Lest We Forget
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: Family owned photograph of possibly a Sgts Mess group including Sjt Beardwood.
External Debt Growth Trends in Georgia
Creators: name: Dzneladze, Ledi
Publisher: name: Georgian Maritime Scientific Journal
Year: 2021

description: The article discusses the dynamics of foreign debt growth in Georgia. Relevant analysis is done by years. Conclusions are drawn in this regard. Problems caused by the increase of foreign debt and proposals for debt reduction are given.
description: Georgian Maritime Scientific Journal, Vol. 1 No. 1 (2021): Georgian Maritime Scientific Journal
CAP Reform Options: A Challenge for Analysis and Synthesis
Creators: name: Jambor, Attila
name: Harvey, David R.
name: Jambor, Attila
name: Harvey, David R.
Publisher: name: Unknown
Year: 2010
Subjects: Agricultural and Food Policy

description: The European Union’s Common Agricultural Policy is continually evolving. The growing debate about the future of the EU Budget post 2013 raises major questions about the future of the CAP. A formal Communication on the future of the Common Agriculture Policy (CAP) after 2013 is due to be published by the Commission in the summer/early autumn of this year – in order to launch a full public debate on the issues, and as a part of the Budget Review of 2011. Formal legislative proposals on the post-2013 CAP will then follow in mid-2011 – together with Commission proposals for the post-2013 Financial Perspectives. It is, therefore, appropriate to review the discussions of further reforms, and also to consider our professional capacity to provide robust analysis of potential futures. The debate on the future CAP is of more than an agricultural interest as it affects, inter alia, the environment, climate change, food quality and security and rural communities and their development. Numerous views have already been expressed on the future of the CAP. However there is very limited synthesis of the options and principles underlying their evolutionary fitness – that is, the extent to which suggestions correspond to the socio-economic environment and political climate upon which the future persistence of the CAP depends. This paper synthesises present views on the future of CAP, and outlines a possible conceptual framework for future research and analyses in the field.
1177: Pte John Smith (letter; photographs)
Creators: name: Project Team, Lest We Forget
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: Son of Mr. and Mrs. William Smith, of 246, Manchester Rd., Walkden, Manchester.
Constraints on Field Galaxy Halos from Weak Lensing and Satellite Dynamics
Creators: name: Brainerd, Tereasa G.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Here I summarize constraints on the nature of the dark matter halos of field galaxies that have been obtained from the most recent investigations of (i) weak galaxy-galaxy lensing and (ii) the dynamics of satellite galaxies in orbit about large host galaxies. Both of these techniques are statistical in their in their nature (i.e., large samples of galaxies are required to obtain a "signal"), but since they have inherently different selection biases and systematic errors they are quite complementary to each other. Results of work over the last several years on weak lensing and satellite dynamics is revealing a remarkably consistent picture regarding the dark matter halos of bright field galaxies (L > L*). The halos extend to large physical radii (> 150 kpc/h) and are flattened in projection on the sky, there is a marked difference in the depths of the potential wells of early-type galaxies and late-type galaxies, and the velocity dispersion profiles of the halos decrease at large projected radii. All of these are expected to hold true in a cold dark matter universe and, while neither technique can address the the possible small-scale conflicts between CDM and observed galaxies, on scales > 50 kpc/h both techniques yield results that are consistent with each other and with the predictions of CDM.
description: 28 pages, 15 figures, invited review in "The New Cosmology", eds. R. E. Allen, D. V. Nanopoulos, and C. N. Pope, in press
1193: Cpl William Brickles (medals; trench art; commemorative card)
Creators: name: Project Team, Lest We Forget
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: The collection includes Trench Art and Commemorative Card.
Capital Based Sustainability Indicators as a Possible Way for Measuring Agricultural Sustainability
Creators: name: Saunders, Caroline M.
name: Kaye-Blake, William
name: Campbell, Rachel
name: Saunders, Caroline M.
name: Kaye-Blake, William
name: Campbell, Rachel
Publisher: name: Unknown
Year: 2010
Subjects: Agricultural and Food Policy

description: This paper takes the capital based approach to sustainability and applies this to examine the sustainability of different farming methods. The capital based approach argues that for future generations to be as well off as the present than the capital base should at least be maintained. The paper explores some of the issues around this approach such as the definition of capitals, their measurement and weakness in the approach which do not account for the resilience of system and/ or the substitutability of capitals. The paper outlines how this could be applied to agriculture and show sustainability across different farming methods. The data used is from the ARGOS (Agricultural Research Group on Sustainability) project which has collected data on social, economic and environmental factors from kiwifruit orchards green, green organic and gold, for five years. The results show little significant differences across orchard types. This may be due to the homogeneity of kiwifruit orchards and it is intended to expand this to the sheep sector to examine this further.
The Prospects of Using an Artificial Underwater Reef in the Maritime Water Area of Georgia
Creators: name: Tkhilaishvili, Guladi
name: Tchanidze, Ketevan
Publisher: name: Georgian Maritime Scientific Journal
Year: 2021

description: The article discusses the importance of using underwater artificial reefs, the current situation, and prospects. The use of underwater artificial reefs has different purposes, such as strengthening fishery resources, population growth of living organisms in the sea, hydrobiological reclamation, development of diving tourism, coastal reinforcement function, etc. The use of artificial reefs is discussed within the concept of the “Blue Economy”. Thus, the Black Sea "blue economy" goal is to preserve, protect, and reap the biodiversity of marine resources. The sea has not an unlimited resource and the anthropogenic factors can significantly reduce or increase the economic benefits of the sea. The prudent management of marine resources and the improvement of the ecological condition of the sea are extremely important for sustainable economic development. The work discusses the importance of artificial reefs for the ecosystem, the diversity of underwater flora and fauna, and the prospect of increasing its inhabitants. The study's goal is to study the economic effects of artificial reefs, their impact on the environment, durable and easily portable design layout for the depth of the sea. And, the aim is to run the production, placement of the artificial reefs at the coastal waters of Georgia, and promote the establishment of the initiative.
description: Georgian Maritime Scientific Journal, Vol. 1 No. 1 (2021): Georgian Maritime Scientific Journal
From weak to strong: constrained extrapolation of perturbation series with applications to dilute Fermi systems
Creators: name: Wellenhofer, C.
name: Phillips, D. R.
name: Schwenk, A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We develop a method that uses truncation-order-dependent re-expansions constrained by generic strong-coupling information to extrapolate perturbation series to the nonperturbative regime. The method is first benchmarked against a zero-dimensional model field theory and then applied to the dilute Fermi gas in one and three dimensions. Overall, our method significantly outperforms Padé and Borel extrapolations in these examples. The results for the ground-state energy of the three-dimensional Fermi gas are robust with respect to changes of the form of the re-expansion and compare well with quantum Monte Carlo simulations throughout the BCS regime and beyond.
description: minor improvements, matches published version; 11 pages, 8 figures
Invariant Class Operators in the Decoherent Histories Analysis of Timeless Quantum Theories
Creators: name: Halliwell, J. J.
name: Wallden, P.
Publisher: name: arXiv
Year: 2005
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The decoherent histories approach to quantum theory is applied to a class of reparametrization invariant models, which includes systems described by the Klein-Gordon equation, and by a minisuperspace Wheeler-DeWitt equation. A key step in this approach is the construction of class operators characterizing the questions of physical interest, such as the probability of the system entering a given region of configuration space without regard to time. In non-relativistic quantum mechanics these class operators are given by time-ordered products of projection operators. But in reparametrization invariant models, where there is no time, the construction of the class operators is more complicated, the main difficulty being to find operators which commute with the Hamiltonian constraint (and so respect the invariance of the theory). Here, inspired by classical considerations, we put forward a proposal for the construction of such class operators for a class of reparametrization-invariant systems. They consist of continuous infinite temporal products of Heisenberg picture projection operators. We investigate the consequences of this proposal in a number of simple models and also compare with the evolving constants method.
description: 45 pages, RevTex. Version 2. Substantial rewriting of Section 9 correcting earlier errors
Combining discrete and continuous mixing approaches to accommodate heterogeneity in price sensitivities in environmental choice analysis
Creators: name: Campbell, Danny
name: Doherty, Edel
name: Hynes, Stephen
name: Van Rensburg, Tom M.
name: Campbell, Danny
name: Doherty, Edel
name: Hynes, Stephen
name: Van Rensburg, Tom M.
Publisher: name: Unknown
Year: 2010
Subjects: subject: Environmental Economics and Policy
subject: discrete choice experiments
subject: discrete mixtures
subject: continuous mixtures
subject: mixtures of distributions
subject: price sensitivities
subject: farmland recreation
subject: willing to pay space

description: Data from a discrete choice experiment aimed at eliciting the demand for recreational walking trails on farmland in the Republic of Ireland is used to explore the consequences of misspecifying the cost coefficient. To enable straightforward calculation of WTP from the distributions of the non-price coefficients, the price coefficient is typically held constant in mixed logit models. This implies that all respondents are equally price sensitive. In this paper we test the validity of this assumption. Our approach is based on a comparison and combination of discrete and continuous mixing approaches (i.e., a mixture of distributions) to uncover the unobserved heterogeneity in price sensitivities. Results from the analysis highlight that model fit and willingness to pay are sensitive to the distributional assumptions used to represent the price coefficient.
On the dynamics of isometries
Creators: name: Karlsson, Anders
Publisher: name: arXiv
Year: 2005
Subjects: subject: Metric Geometry (math.MG)
subject: Dynamical Systems (math.DS)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 37B05, 53C24,, 22F50, 32H50

description: We provide an analysis of the dynamics of isometries and semicontractions of metric spaces. Certain subsets of the boundary at infinity play a fundamental role and are identified completely for the standard boundaries of CAT(0)-spaces, Gromov hyperbolic spaces, Hilbert geometries, certain pseudoconvex domains, and partially for Thurston's boundary of Teichmueller spaces. We present several rather general results concerning groups of isometries, as well as the proof of other more specific new theorems, for example concerning the existence of free nonabelian subgroups in CAT(0)-geometry, iteration of holomorphic maps, a metric Furstenberg lemma, random walks on groups, noncompactness of automorphism groups of convex cones, and boundary behaviour of Kobayashi's metric.
description: Published by Geometry and Topology at http://www.maths.warwick.ac.uk/gt/GTVol9/paper55.abs.html
Probabilistic methods for predicting protein functions in protein-protein interaction networks
Creators: name: Best, Christoph
name: Zimmer, Ralf
name: Apostolakis, Joannis
Publisher: name: arXiv
Year: 2005
Subjects: subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: We discuss probabilistic methods for predicting protein functions from protein-protein interaction networks. Previous work based on Markov Randon Fields is extended and compared to a general machine-learning theoretic approach. Using actual protein interaction networks for yeast from the MIPS database and GO-SLIM function assignments, we compare the predictions of the different probabilistic methods and of a standard support vector machine. It turns out that, with the currently available networks, the simple methods based on counting frequencies perform as well as the more sophisticated approaches.
description: 11 pages, 3 figures. Paper presented at the German Conference on Bioinformatics, 2004, Oct 4-6, Bielefeld, Germany
Water in zeolite L and its MOF mimic
Creators: name: Tabacchi, Gloria
name: Fois, Ettore
Publisher: name: figshare
Year: 2020
Subjects: subject: 30799 Theoretical and Computational Chemistry not elsewhere classified
subject: FOS: Chemical sciences
subject: 30304 Physical Chemistry of Materials
subject: 30699 Physical Chemistry not elsewhere classified
subject: Computational Chemistry
subject: 30307 Theory and Design of Materials
subject: 30207 Transition Metal Chemistry
subject: 30299 Inorganic Chemistry not elsewhere classified
subject: 39999 Chemical Sciences not elsewhere classified

description: Green open access version of the paperWater in zeolite L and its MOF mimic
Ettore Fois, Gloria Tabacchipublished in:Zeitschrift für Kristallographie - Crystalline Materials, 2019, Volume 234: Issue 7-8.doi: https://doi.org/10.1515/zkri-2018-2153
See also lay summary at:https://link.growkudos.com/1k032fm562o

See poster at:https://figshare.com/articles/Water_in_zeolite_L_and_its_MOF_mimic/9036809

See blog post at:https://bit.ly/2V2X7lq
The Recurrent Nature of Central Starbursts
Creators: name: Struck, Curtis
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: New hydrodynamic models with feedback show that feedback driven turbulence and subsequent relaxation can drive recurrent starbursts, though most of these bursts fizzle due to premature, asymmetric ignition. Strong bursts are terminated when the turbulence inflates the multiphase central disk. The period between bursts is about twice a free-fall time onto the central disk. Transient spirals and bars are common through the burst cycle.
description: 7 pages + 3 figs. Conf. paper for "Starbursts: from 30 Doradus to Lyman Break Galaxies," held at Inst. of Astronomy, Cambridge Univ., Sept. 6-10, 2004. Kluwer Academic Publishers, eds. R. de Grijs and R. M. Gonzalez Delgado + additional material
A comprehensive dynamic growth and development model of Hermetia illucens larvae
Creators: name: Padmanabha, Murali
name: Kobelski, Alexander
name: Hempel, Arne-Jens
name: Streif, Stefan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Systems and Control (eess.SY)
subject: FOS: Biological sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Larvae of Hermetia illucens, also commonly known as black soldier fly (BSF) have gained significant importance in the feed industry, primarily used as feed for aquaculture and other livestock farming. Mathematical model such as Von Bertalanffy growth model and dynamic energy budget models are available for modelling the growth of various organisms but have their demerits for their application to the growth and development of BSF. Also, such dynamic models were not yet applied to the growth of the BSF larvae despite models proven to be useful for automation of industrial production process (e.g. feeding, heating/cooling, ventilation, harvesting, etc.). This work primarily focuses on developing a model based on the principles of the afore mentioned models from literature that can provide accurate mathematical description of the dry mass changes throughout the life cycle and the transition of development phases of the larvae. To further improve the accuracy of these models, various factors affecting the growth and development such as temperature, feed quality, feeding rate, moisture content in feed, and airflow rate are developed and integrated into the dynamic growth model. An extensive set of data were aggregated from various literature and used for the model development, parameter estimation and validation. Models describing the environmental factors were individually validated based on the data sets collected. In addition, the dynamic growth model was also validated for dry mass evolution and development stage transition of larvae reared on different substrate feeding rates. The developed models with the estimated parameters performed well highlighting its application in decision-support systems and automation for large scale production.
Can one hear the shape of the Universe?
Creators: name: Aurich, R.
name: Lustig, S.
name: Steiner, F.
name: Then, H.
Publisher: name: arXiv
Year: 2004
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: It is shown that the recent observations of NASA's explorer mission "Wilkinson Microwave Anisotropy Probe" (WMAP) hint that our Universe may possess a non-trivial topology. As an example we discuss the Picard space which is stretched out into an infinitely long horn but with finite volume.
description: 4 pages
Multilayer neutron stars with scalar mesons crossing term
Creators: name: Kubis, Sebastian
name: Wójcik, Włodzimierz
name: Zabari, Noemi
Publisher: name: arXiv
Year: 2020
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: It is shown that recently proposed RMF model with $σ$ and $δ$ meson interaction agrees with the observational data and presents an interesting structure with phase transition in the outer part of neutron star core.
description: 5 pages, 5 figures, 1 table
Standard and Shuffled Halton Sequences in a Mixed Logit Model
Creators: name: Staus, Alexander
name: Staus, Alexander
Publisher: name: Unknown
Year: 2008
Subjects: subject: Consumer/Household Economics
subject: Food Consumption/Nutrition/Food Safety
subject: simulation
subject: mixed logit
subject: halton sequence

description: Modeling consumer choice in different areas has lead to an increase use of discrete choice models. Probit or Multinomial Logit Models are often the base of further empirical research of consumer choice. In some of these models the equations to solve have no closed-form expression. They include multi-dimensional integrals which can not be solved analytically. Simulation methods have been developed to approximate a solution for these integrals. This paper describes the Standard Halton sequence and a modification of it, the Shuffled Halton sequence. Both are simulation methods which can reduce computational effort compared to a random sequence. We compare the simulation methods in their coverage of the multi-dimensional area and in their estimation results using data of consumer choice on grocery store formats.
Chromospheric activity induced by short-period planets : a search for modulation of Ca II H & K emission
Creators: name: Shkolnik, Evgenya
Publisher: name: University of British Columbia
Year: 2009

description: I have detected the first evidence of magnetic interaction between an extra-solar planet and its parent star. Of the > 100 extrasolar planets discovered to date, approximated 20% of them are '51 Peg'-type with a Jupiter-mass planet orbiting within 0.1 Astronomical Units. The systems with the tightest orbits (P[sub orb] < 5 days) offer the best opportunity to observe a tidal or magnetic interaction between the planet and its parent star. Stellar chromospheric activity could be modulated in two ways. For magnetic interaction, the modulation is predicted to be at the orbital period with enhancement near the sub-planetary point (ø = 0). Tidal interaction would stimulate activity with a period of P[sub orb] /2 with enhancements near both ø = 0 and 0.5. The Ca II H & K line reversals at 3968 and 3933 Å are the best chromospheric activity indicators visible from the ground. I observed the H & K emission cores of five sun-like stars with short period planets: τ Boo, HD179949, HD 209458, 51 Peg and υ And. I acquired 10 nights of high resolution (≈ 110,000), high S/N (~ 500) data at the Canada-France-Hawaii Telescope over three semesters: 2001 August, 2002 July and 2002 August. The superb quality of the data yielded differential radial velocities to better than 20 m s⁻¹. Fitting known orbital parameters such as period and velocity amplitude to the radial velocities, I determined updated ephemerides and accurate orbital phases. Night-to-night modulation of the H & K emission was observed in 4 of the 5 stars. Our two standards, τ Ceti and the sun, showed no such variability. Three of the 4 'active' stars did not appear to show a correlation between activity and orbital phase. However, HD 179949, the star with the tightest planetary orbit (P[sub orb] = 3.093 days), repeatedly showed a 2.5% enhancement in the Ca II K emission leading the sub-planetary point by 0.17 in phase. A decrease was observed when the planet was behind the star. The activity persisted for 108 orbits (or 37 stellar rotations). This is the first detection of magnetic interaction between a star and its giant planet, as well as a first glimpse of an extrasolar planetary magnetosphere. As an exaggerated example of enhanced chromospheric activity induced by a companion, we observed ER Vul, an RS CVn binary system with P[sub orb], = 17 hours. Using the same setup at the CFHT, we obtained Ca II H &; K spectra with nearly complete phase coverage. This system shows increased activity near the sub-binary longitudes of both components. There is also evidence of Ca II emission from between the two stars. Observations of κ¹ Ceti, an active single dwarf star, show periodic H & K activity modulated by the stellar rotation (P[sub rot] = 9.4 d.) with an enhancement level of ≈ 7%. The stimulating mechanism for its activity is unknown and may be evidence of a yet unseen, nearby companion.
Physical and mathematical evidences for a negative-rank tensor
Creators: name: Gaete, Patricio
name: Wotzasek, Clovis
Publisher: name: arXiv
Year: 2005
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose and study the properties of a new potential demanded by the self-consistency of the duality scheme in electromagnetic-like field theories of totally anti-symmetric tensors in diverse dimensions. Physical implications of this new potential is manifest under the presence of scalar condensates in the Julia-Toulouse mechanism for the nucleation of topological defects with consequences for the confinement phenomenon.
description: 7 pages
1198: Dvr Percival Hopton Millhouse (photograph)
Creators: name: Project Team, Lest We Forget
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: Family photograph of Dvr Millhouse.
1163: AB Albert Heaton RN (documents; photographs; artefacts)
Creators: name: Project Team, Lest We Forget
Publisher: name: University of Oxford
Year: 2024
Subjects: classificationCode: 430304
subject: British history
classificationCode: 430308
subject: European history (excl. British, classical Greek and Roman)
classificationCode: 430316
subject: International history

description: Family collection of artifacts.
Challenges of the Modern Technical Translation and Maritime Education
Creators: name: Mikeladze, Tamila
name: Rodinadze, Svetlana
name: Bezhanovi, Zurab
Publisher: name: Georgian Maritime Scientific Journal
Year: 2021

description: Thirst for innovation and novelties is an integral part of establishment and development of the modern society, providing sharing of experience via effective communication means. Lightning-fast development of informational technologies of the XX century totally removed the existed boundaries and multicultural relations between the nations, informational exchange and share of consciousness is a common lifestyle of Euro Atlantic space. Translation is a major mediator for correct perception of information. In line with the rise of the volume of information, amount of new words, word combinations and/or phrases especially in marine technical fields, is constantly increasing. Thus, the aim of the presented paper is to detect peculiarities of maritime technical terminology with the purpose of its adequate translation provision and appropriate application within the frame of maritime education and training.
description: Georgian Maritime Scientific Journal, Vol. 1 No. 1 (2021): Georgian Maritime Scientific Journal
A BRIEF REVIEW OF ADDITIVE MANUFACTURING WITH APPLICATIONS
Creators: name: G. M. Shashi
name: Md Ashiqur Rahman Laskar
name: Hridoy Biswas
name: Aritra Kumar Saha
Publisher: name: figshare
Year: 2020
Subjects: Additive Manufacturing

description: Additive Manufacturing (AM) has added a new dimension in manufacturing process by exploiting advanced technology. Utilization of AM technologies in different sectors has increased remarkably in the present days. This paper reviews the available AM techniques as well as the advantages specifically. It will also discuss several empirical applications of AM before describing the current landscape in Additive Manufacturing. Furthermore, an attempt is made to find out the challenges and opportunities for future AM.