cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Mathematical Modeling to Study the Dynamics of A Diatomic Molecule N2 in Water
Creators: name: Sharma, Nitin
name: Shakya, Madhvi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: In the present work an attempt has been made to study the dynamics of a diatomic molecule N2 in water. The proposed model consists of Langevin stochastic differential equation whose solution is obtained through Euler's method. The proposed work has been concluded by studying the behavior of statistical parameters like variance in position, variance in velocity and covariance between position and velocity. This model incorporates the important parameters like acceleration, intermolecular force, frictional force and random force.
description: https://sites.google.com/site/journalofcomputing
Choice-memory tradeoff in allocations
Creators: name: Alon, Noga
name: Gurel-Gurevich, Ori
name: Lubetzky, Eyal
Publisher: name: arXiv
Year: 2009
Subjects: subject: Combinatorics (math.CO)
subject: Probability (math.PR)
subject: FOS: Mathematics

description: In the classical balls-and-bins paradigm, where $n$ balls are placed independently and uniformly in $n$ bins, typically the number of bins with at least two balls in them is $Θ(n)$ and the maximum number of balls in a bin is $Θ(\frac{\log n}{\log \log n})$. It is well known that when each round offers $k$ independent uniform options for bins, it is possible to typically achieve a constant maximal load if and only if $k=Ω(\log n)$. Moreover, it is possible w.h.p. to avoid any collisions between $n/2$ balls if $k>\log_2n$. In this work, we extend this into the setting where only $m$ bits of memory are available. We establish a tradeoff between the number of choices $k$ and the memory $m$, dictated by the quantity $km/n$. Roughly put, we show that for $km\gg n$ one can achieve a constant maximal load, while for $km\ll n$ no substantial improvement can be gained over the case $k=1$ (i.e., a random allocation). For any $k=Ω(\log n)$ and $m=Ω(\log^2n)$, one can achieve a constant load w.h.p. if $km=Ω(n)$, yet the load is unbounded if $km=o(n)$. Similarly, if $km>Cn$ then $n/2$ balls can be allocated without any collisions w.h.p., whereas for $km
description: Published in at http://dx.doi.org/10.1214/09-AAP656 the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Dynamics and merger rate of primordial black holes in a cluster
Creators: name: Stasenko, Viktor D.
name: Kirillov, Alexander A.
name: Belotsky, Konstantin M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The PBHs clusters can be source of gravitational waves, and the merger rate depends on the spatial distribution of PBHs in the cluster which changes over time. It is well known that gravitational collisional systems experience the core collapse, that leads to significantly increase of the central density and shrinking of the core. After core collapse, the cluster expands almost self-similarly (i.e. density profile extends in size without changing its shape). These dynamic processes affect at the merger rate of PBHs. In this paper the dynamics of the PBH cluster is considered using the Fokker-Planck equation. We calculate the merger rate of PBHs on cosmic time scales and show that its time dependence has a unique signature. Namely, it grows by about an order of magnitude at the moment of core collapse which depends on the characteristic of the cluster, and then decreases according to the dependence $\mathcal{R} \propto t^{-1.48}$. It was obtained for monochromatic and power-law PBH mass distributions with some fixed parameters. Obtained results can be used to test the model of the PBH clusters via observation of gravitational waves at high redshift.
Digital Transformation for Enhancing Customer Value: Insights from Five Calabrian SMEs
Creators: name: Ferraro, Laura
Publisher: name: Economia Aziendale Online -
Year: 2025
Subjects: Small and Medium Enterprises, Digital Transformation, Dynamic Capabilities, Customers, Sustainability, Multiple Case Studies

description: The paper analyzes the effects of digital transformation on the social sustainability of Italian small and medium enterprises (SMEs), focusing on the evolving relationship with customers and the potential for enhancing value creation for them. Following a literature review on digital transformation among SMEs, the paper examined five Calabrian SMEs across various sectors using a methodological framework incorporating multiple case studies. Specifically, semi-structured interviews and questionnaires were conducted. Secondary sources such as company websites and financial and non-financial reports were consulted to verify the data’s accuracy. The findings indicate that, for the chosen SMEs, digital tools enhance the innovation of their business models by establishing new distribution channels and innovative methods for creating and delivering value to customers. The analysis also offers theoretical, practical, managerial, and social implications. 
description: Economia Aziendale Online -, Vol 16, No 1 (2025): ISSUE 1/2025
Asymptotic Plateau Problem
Creators: name: Coskunuzer, Baris
Publisher: name: arXiv
Year: 2009
Subjects: subject: Differential Geometry (math.DG)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 53A10, 57M50

description: This is a survey of old and recent results about the asymptotic Plateau problem. Our aim is to give a fairly complete picture of the field, and present the current situation.
description: 26 pages
Semiclassical model for a memory dephasing channel
Creators: name: D'Arrigo, A.
name: Benenti, G.
name: Falci, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study a dephasing channel with memory, described by a Hamiltonian model in which the system-environment interaction is described by a stochastic process. We propose a useful way to describe the channel uses correlations. Moreover, we give a general expression for the coherences decay factors as a function of the number of channel uses and of the stochastic process power spectrum. We also study the impact of memory on the three qubit code, showing that correlations among channel uses affect very little the code performance.
description: 8pages, 3 figures, proceedings of CEWQO 2008 Conference
Additional file 4 of Barriers to and enablers of uptake of antiretroviral therapy in integrated HIV and tuberculosis treatment programmes in sub-Saharan Africa: a systematic review and meta-analysis
Creators: name: Kadia, Benjamin Momo
name: Dimala, Christian Akem
name: Fongwen, Noah T.
name: Smith, Adrian D.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 4. Subgroup analysis by region of Africa.
Tarema: Adaptive Resource Allocation for Scalable Scientific Workflows in Heterogeneous Clusters
Creators: name: Bader, Jonathan
name: Thamsen, Lauritz
name: Kulagina, Svetlana
name: Will, Jonathan
name: Meyerhenke, Henning
name: Kao, Odej
Publisher: name: arXiv
Year: 2021
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Scientific workflow management systems like Nextflow support large-scale data analysis by abstracting away the details of scientific workflows. In these systems, workflows consist of several abstract tasks, of which instances are run in parallel and transform input partitions into output partitions. Resource managers like Kubernetes execute such workflow tasks on cluster infrastructures. However, these resource managers only consider the number of CPUs and the amount of available memory when assigning tasks to resources; they do not consider hardware differences beyond these numbers, while computational speed and memory access rates can differ significantly. We propose Tarema, a system for allocating task instances to heterogeneous cluster resources during the execution of scalable scientific workflows. First, Tarema profiles the available infrastructure with a set of benchmark programs and groups cluster nodes with similar performance. Second, Tarema uses online monitoring data of tasks, assigning labels to tasks depending on their resource usage. Third, Tarema uses the node groups and task labels to dynamically assign task instances evenly to resources based on resource demand. Our evaluation of a prototype implementation for Kubernetes, using five real-world Nextflow workflows from the popular nf-core framework and two 15-node clusters consisting of different virtual machines, shows a mean reduction of isolated job runtimes by 19.8% compared to popular schedulers in widely-used resource managers and 4.54% compared to the heuristic SJFN, while providing a better cluster usage. Moreover, executing two long-running workflows in parallel and on restricted resources shows that Tarema is able to reduce the runtimes even more while providing a fair cluster usage.
Underground ice in permafrost, Mackenzie Delta-Tuktoyaktuk Peninsula, N.W.T.
Creators: name: Gell, William Alan
Publisher: name: University of British Columbia
Year: 2010

description: A study was made of the petrology of a variety of underground ice types in permafrost on the Tuktoyaktuk Peninsula and Pelly Island, Mackenzie Delta, N.W.T. Ice bodies of a considerable range of ages occur, including some deformed in the Wisconsin glaciation; also permafrost and ice is growing ab initio beneath recently drained lake bottoms. The spectrum of ice body size is also wide, extending from pore-sized particles to beds 25 m thick. The major objective of the study was an understanding of the growth and deformation of such ice bodies from a petrologic viewpoint. Thus several bodies of known, recent, age -were analyzed in order to enumerate features typical of growth. This was possible for icing mounds, tension cracks and active layer ice which grew in winter 1973-74. Growth conditions were inferred in terms of water supply, freezing directions and rates, solute rejection (bubble formation) and crystal size, shape, lattice and dimensional orientation. On the basis of this knowledge of growth features, older and larger ice bodies were studied, and post-solidification characteristics ware analyzed. Soma near-surface ice gave evidence of thermomigration of bubbles, but the major changes in fabric ware due to thermally and mechanically induced stresses. In the case of wedge ice, progressive changes in crystal size, shape, lattice and dimensional orientation ware recognized from the centre to the boundary of the wedge, due to recrystallization and grain growth associated with wedge development. Segregated ice was studied ia pingos and an involuted hill. A pingo core with steeply-dipping beds showed little evidence of flow while broader pingo with a greater pore ice content had undergone some flow in the segregated ice layers. A range of fabrics was found in the involuted hill, optic axis orientations becoming increasingly concentrated normal to compositional layering while dimensional orientations tended towards parallelism with the layering in anticlines in the ice. The influence of bubbles on deformation is pointed out in that larger crystals occur in clear ice and thus have greater intracrystalline slip than in bubbly ice. Where a wedge penetrated such a fold, the fabric changed along the fold limb in a manner symmetrically related to the wedge. Additionally, several near-surface ices ware studied and showed evidence of multiple growth periods, and multiple freezing directions, indicating that the ice grew in enclosed water in frozen material. Thus the complexity of freezing and melting histories may be recognized petro-graphically while it is not readily apparent in the field.
Production and transport of vorticity in two-dimensional Rayleigh-Bénard convection cell
Creators: name: Xu, Ao
name: Xu, Ben-Rui
name: Jiang, Li-Sheng
name: Xi, Heng-Dong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: We present a numerical study of vorticity production and transport in the two-dimensional Rayleigh-Bénard (RB) convection. Direct numerical simulations are carried out in the Rayleigh number ($Ra$) range $10^{5}\le Ra \le 10^{6}$, the Prandtl number ($Pr$) of 0.71, and the aspect ratio ($Γ$) of the convection cell range $0.75\le Γ\le 6$. We found that the flow structure and temperature distribution vary with $Γ$ greatly due to multiple vortices interaction. Further investigation on the vorticity production and transport reveals that, in the RB convection, in addition to the vorticity production due to wall shear stress, buoyancy produces significant vorticity in the bulk region. The produced vorticity is transported via advection and diffusion. An interesting finding is that the main vortices and the corner vortices can be visualized via the contour of buoyancy-produced vorticity. Although a vigorous definition of the vortex is still lacking in the community, our efficient vortex visualization approach in the RB convection may shed light on further research toward vortex identification. We also found that the spatial distribution of vorticity flux along the wall is positively correlated with that of the Nusselt number ($Nu$), suggesting the amount of vorticity that enters the flow is directly related to the amount of thermal energy that enters the flow.
description: 23 pages, 13 figures
Dual order parameters and the deconfinement transition
Creators: name: Fischer, Christian S.
name: Mueller, Jens A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the chiral and the deconfinement transition within the framework of Dyson-Schwinger equations using quenched lattice data for the temperature dependent gluon propagator as input. We extract corresponding order parameters from the Landau gauge quark propagator with U(1)-valued boundary conditions. We study the chiral transition using the conventional quark condensate, whereas for the deconfinement transition we determine the dual condensate ('dressed Polyakov loop'). In addition we consider an alternative order parameter for deconfinement, the dual scalar quark dressing function. As a result we find almost the same transition temperatures for the chiral and deconfinement transitions.
description: 8 pages, 4 figures, contributed to the proceedings of the EMMI Workshop and XXVI Max Born Symposium at 09th-11th of July 2009 in Wroclaw, Poland
Rotational Response of Two-Component Bose-Einstein Condensates in Ring Traps
Creators: name: Halkyard, P. L.
name: Jones, M. P. A.
name: Gardiner, S. A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider a two-component Bose-Einstein condensate (BEC) in a ring trap in a rotating frame, and show how to determine the response of such a configuration to being in a rotating frame, via accumulation of a Sagnac phase. This may be accomplished either through population oscillations, or the motion of spatial density fringes. We explicitly include the effect of interactions via a mean-field description, and study the fidelity of the dynamics relative to an ideal configuration.
description: 4 pages, 4 figures
SPADES and mixture models
Creators: name: Bunea, Florentina
name: Tsybakov, Alexandre B.
name: Wegkamp, Marten H.
name: Barbu, Adrian
Publisher: name: arXiv
Year: 2009
Subjects: subject: Statistics Theory (math.ST)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This paper studies sparse density estimation via $\ell_1$ penalization (SPADES). We focus on estimation in high-dimensional mixture models and nonparametric adaptive density estimation. We show, respectively, that SPADES can recover, with high probability, the unknown components of a mixture of probability densities and that it yields minimax adaptive density estimates. These results are based on a general sparsity oracle inequality that the SPADES estimates satisfy. We offer a data driven method for the choice of the tuning parameter used in the construction of SPADES. The method uses the generalized bisection method first introduced in \citebb09. The suggested procedure bypasses the need for a grid search and offers substantial computational savings. We complement our theoretical results with a simulation study that employs this method for approximations of one and two-dimensional densities with mixtures. The numerical results strongly support our theoretical findings.
description: Published in at http://dx.doi.org/10.1214/09-AOS790 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Annealing a Follow-up Program: Improvement of the Dark Energy Figure of Merit for Optical Galaxy Cluster Surveys
Creators: name: Wu, Hao-Yi
name: Rozo, Eduardo
name: Wechsler, Risa H.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The precision of cosmological parameters derived from galaxy cluster surveys is limited by uncertainty in relating observable signals to cluster mass. We demonstrate that a small mass-calibration follow-up program can significantly reduce this uncertainty and improve parameter constraints, particularly when the follow-up targets are judiciously chosen. To this end, we apply a simulated annealing algorithm to maximize the dark energy information at fixed observational cost, and find that optimal follow-up strategies can reduce the observational cost required to achieve a specified precision by up to an order of magnitude. Considering clusters selected from optical imaging in the Dark Energy Survey, we find that approximately 200 low-redshift X-ray clusters or massive Sunyaev-Zel'dovich clusters can improve the dark energy figure of merit by 50%, provided that the follow-up mass measurements involve no systematic error. In practice, the actual improvement depends on (1) the uncertainty in the systematic error in follow-up mass measurements, which needs to be controlled at the 5% level to avoid severe degradation of the results; and (2) the scatter in the optical richness-mass distribution, which needs to be made as tight as possible to improve the efficacy of follow-up observations.
description: 12 pages, 7 figures, replaced to match published version
Search for supersolid 4He in neutron scattering experiments at ISIS
Creators: name: Kirichek, Oleg
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The observation of a non-classical rotation inertia (NCRI) fraction in bulk solid 4He by M. Chan and E. Kim attracted significant interest as a possible manifestation of supersolid state of matter. Despite numerous experimental and theoretical studies inspired by this observation, an explicit explanation for this phenomenon is still missing. Neutron scattering experiments on solid elium may help to shed light on the physical grounds of NCRI and answer the question on whether this phenomenon could be caused by Bose-Einstein Condensation. In this paper we are going to discuss the results obtained in experiments involving neutron scattering on solid 4He. Microscopic quantitative data such as mean kinetic energy, mean square momentum and mean square displacement of helium atoms as well as the lattice parameter have been obtained for the first time for solid 4He in temperature range 70 mK - 500 mK. No change was seen in the single atom kinetic energy within statistical error better than 1per cent as well as change in the lattice parameter within 0.03 per cent. The mean square displacement did not change in the region of expected supersolid transition either. All these results suggest that the NCRI transition is quite different from the superfluid transition in liquid 4He.
description: LT25
Η ποινική ευθύνη για τη δημοσίευση ανακριβών χρηματοοικονομικών καταστάσεων σύμφωνα με τις διατάξεις των νόμων 4738/2020 (πτωχευτικά αδικήματα), 4548/2018 (αδικήματα σχετικά με τις Α.Ε.) και 4443/2016 (χρηματιστηριακά αδικήματα)
Creators: name: Αβράμης, Θεόδωρος Χαράλαμπου
Publisher: name: Aristotle University of Thessaloniki
Year: 2024
Subjects: Ανακριβείς χρηματοοικονομικές καταστάσεις
Πτωχευτικά αδικήματα
Χρηματιστηριακά αδικήματα
Inaccurate financial statements
Bankruptcy offences
Stock market offences

description: Σκοπός της διατριβής αποτέλεσε η συνοπτική παρουσίαση των διατάξεων που ρυθμίζουν τη σύνταξη χρηματοοικονομικών καταστάσεων και της ποινικής ευθύνης των αρμοδίων για τη σύνταξή τους. Εξετάσαμε ποιες είναι οι χρηματοοικονομικές καταστάσεις και ποια στοιχεία τις απαρτίζουν, καθώς τις αρχές βάσει των οποίων αυτές οφείλουν να συντάσσονται. Στη συνέχεια, παρουσιάσαμε αναλυτικά ποιες συμπεριφορές στοιχειοθετούν ποινική ευθύνη κατά τη σύνταξή τους υπό το πρίσμα των νόμων 4738/2020, 4548/2018 και 4443/2016. Παράλληλα, παραθέσαμε αρκετά παραδείγματα για να καταστεί σαφές το πώς η φιλοσοφία βάσει της οποίας συντάσσεται μια χρηματοοικονομική κατάσταση και η απόκλιση από τις αρχές βάσει των οποίων αυτή οφείλει να συντάσσεται δύνανται να προκαλέσουν στρέβλωση της συνολικής εικόνας μιας επιχείρησης και να επηρεάσουν το οικονομικό αποτέλεσμα αυτής.
description: The aim of the present thesis was to present a summary of the provisions that regulate the preparation of financial statements and the criminal liability of those responsible for their preparation. We examined what financial statements are and what elements they comprise, as well as the principles according to which they must be prepared. Then, we presented in detail which behaviors constitute criminal liability when drafted in accordance with laws 4738/2020, 4548/2018 and 4443/2016. At the same time, we cited several examples to make clear how the philosophy on the basis of which a financial statement is drawn up and the deviation from the principles on the basis of which it should be drawn up can cause a distortion of the overall image of a company and affect its financial result.
description: Συνεργαζόμενα Τμήματα Νομικής (Δημοκρίτειο Πανεπιστήμιο Θράκης)
Fixed point properties and second bounded cohomology of universal lattices on Banach space
Creators: name: Mimura, Masato
Publisher: name: arXiv
Year: 2009
Subjects: subject: Functional Analysis (math.FA)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 22D12, 20F32

description: Let B be any Lp space for p in (1,infty) or any Banach space isomorphic to a Hilbert space, and k be a nonnegative integer. We show that if n is at least 4, then the universal lattice Gamma =SL_n (Z[x1,...,xk]) has property (F_B) in the sense of Bader--Furman--Gelander--Monod. Namely, any affine isometric action of Gamma on B has a global fixed point. The property of having (F_B) for all B above is known to be strictly stronger than Kazhdan's property (T). We also define the following generalization of property (F_B)$ for a group: the boundedness property of all affine quasi-actions on B. We name it property (FF_B) and prove that the group Gamma above also has this property modulo trivial part. The conclusion above in particular implies that the comparison map in degree two H^2_b (Gamma; B) \to H^2(Gamma; B) from bounded to ordinary cohomology is injective, provided that the associated linear representation does not contain the trivial representation.
description: This is the final version; 21 pages
Baby Skyrmion crystals
Creators: name: Leask, Paul
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: This paper describes a model for baby Skyrme crystal chunks with arbitrary potential by considering energy contributions from the bulk and surface of a crystal chunk. We focus on two potentials which yield distinct Skyrme lattices: the standard potential $V=m^2(1-φ^3)$ and the easy plane potential $V=\frac{1}{2}m^2 (φ^1)^2$. In both models, the static energy functional is minimized over all $2$-dimensional period lattices, yielding the minimal energy crystal structure(s). For the standard potential, the Skyrmions form a hexagonal crystal structure, whereas, for the easy plane potential, the minimal energy crystal structure is a square lattice of half-charge lumps. We find that square crystal chunks are the global minima in the easy plane model for charges $B>6$ with $2B$ a perfect square ($m^2=1$). In contrast, we observe that hexagonal crystal chunks in the standard model become the global minima for surprisingly large charges, $B>954$ ($m^2=0.1$).
description: 15 pages, 14 figures
Primordial Helical Magnetic Fields from Inflation?
Creators: name: Talebian, Alireza
name: Nassiri-Rad, Amin
name: Firouzjahi, Hassan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We revisit the mechanism of helical magnetogenesis during inflation with a parity violating interaction using the formalism of stochastic inflation. One of the polarization of the gauge field undergoes tachyonic growth leading to the generation of helical magnetic fields. We obtain the Langevin equations associated with the electromagnetic fields which are in the form of Ornstein-Uhlenbeck stochastic differential equations. Consequently, the tachyonic growth of the helical magnetic fields is balanced by a mean-reverting process of stochastic dynamics such that the magnetic fields settle down to an equilibrium state with the amplitude smaller than what is obtained in the absence of the stochastic noises. Working in the parameter space of the model where both the backreaction and the strong coupling problems are under control the model does not provide large enough seed to be amplified by the galactic dynamo as the source of the magnetic fields observed on cosmological scales.
description: 24+15 pages, 6 figures, 5 appendices,new references added, match the published version
Data Carpentry: Data Organization in Spreadsheets for Social Scientists workshop
Creators: name: Hettne, Kristina Maria
Publisher: name: Zenodo
Year: 2024
Subjects: Data Carpentry
Spreadsheets
Leiden University Libraries
Tidy Data
Research Data Management
Carpentries

description: Presentation based on the Data Carpentry lesson materials: Data Organization in Spreadsheets for Social Scientists and a presentation by Esther Plomp for a previous Data Carpentry workshop: https://doi.org/10.5281/zenodo.5593434
A partially linearized spin-mapping approach for simulating nonlinear optical spectra
Creators: name: Mannouch, J. R.
name: Richardson, J. O.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We present a partially linearized method based on spin mapping for computing both linear and nonlinear optical spectra. As observables are obtained from ensembles of classical trajectories, the approach can be applied to the large condensed-phase systems that undergo photosynthetic light-harvesting processes. In particular, the recently derived spin-PLDM method has been shown to exhibit superior accuracy in computing population dynamics compared to other related classical-trajectory methods. Such a method should also be ideally suited to describing the quantum coherences generated by interaction with light. We demonstrate that this is indeed the case by calculating the nonlinear optical response functions relevant for the pump--probe and 2D photon-echo spectra for a Frenkel biexciton model and the Fenna--Matthews--Olsen light-harvesting complex. One especially desirable feature of our approach is that the full spectrum can be decomposed into its constituent components associated with the various Liouville-space pathways, offering a greater insight beyond what can be directly obtained from experiment.
description: 24 pages, 13 figures
L'attrazione sessuale: processi psichici e strumenti di indagine.
L'adattamento italiano del Cuestionario de Atraccion sexual
Creators: name: Buizza, Chiara <1971>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2009
Subjects: M-PSI/08 Psicologia clinica

description: The sexual attraction is a complex emotional event, with somatic modifications, that like all the emotions, belongs to the psychic dimension and that, too much simply, can be led back, from a explicative point of view, to biological and psychical causes. The sexual attraction represents a personal experience, that is difficult to record, but of which every adult is able to delineate a correspondence with own âlivedâ. In the within of biological sciences, many experimental studies were been conducted with the aim to know which chemistries substances and cerebral zones are involved in front of a stimulus assessed like sexually attractive. 
Contrarily, there are little researches conducted in psychological field, aimed to the understanding the psychical factors, often unconscious, tinged to the subjective processes of sexual attraction: the sexual attraction remains an unexplored psychological event and unprovided of adapted instruments of assessment.
The present thesis is oriented in primis to examine the existing scientific literature, in order to provide an exhaustive picture of the sexual attraction and to analyze the instruments of survey available for the empirical assessment of it.
Secondly, the thesis is oriented to introduce two studies: the first study is aimed to adapt  the Cuestionario de AtracciÃ³n Sexual - CAS (FernÃ¡ndez ET to, 2006a; 2006b; 2006c) to the Italian language; the second study is aimed to assess the attitudes towards the sexual attraction in a sample of university students, in order to establish if some differences or association with some psychological dimensions (attachment stiles and alexithymia) exist.
Additional file 5 of Barriers to and enablers of uptake of antiretroviral therapy in integrated HIV and tuberculosis treatment programmes in sub-Saharan Africa: a systematic review and meta-analysis
Creators: name: Kadia, Benjamin Momo
name: Dimala, Christian Akem
name: Fongwen, Noah T.
name: Smith, Adrian D.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 5. Subgroup analysis by WHO TB/HIV management guideline.
Fast Radio Burst Distributions Consistent with the First CHIME/FRB Catalog
Creators: name: Qiang, Da-Chun
name: Li, Shu-Ling
name: Wei, Hao
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Currently, fast radio bursts (FRBs) have become a very active field in astronomy and cosmology. However, the origin of FRBs is still unknown to date. The studies on the intrinsic FRB distributions might help us to reveal the possible origins of FRBs, and improve the simulations for FRB cosmology. Recently, the first CHIME/FRB catalog of 536 events was released. Such a large uniform sample of FRBs detected by a single telescope is very valuable to test the FRB distributions. Later, it has been claimed that the FRB distribution model tracking the cosmic star formation history (SFH) was rejected by the first CHIME/FRB catalog. In the present work, we consider some empirical FRB distribution models, and find that many of them can be fully consistent with the CHIME/FRB observational data for some suitable model parameters. Notice that a suppressed evolution with respect to SFH is commonly found for FRBs. In particular, we independently confirm that the FRB distribution model tracking SFH can be rejected at very high confidence. On the other hand, all the ``successful'' models effectively require a certain degree of ``delay'' with respect to SFH. These results might shed light on the origin of FRBs and FRB cosmology.
description: 18 pages, 7 figures, 5 tables, revtex4; v2: discussions added, JCAP in press; v3: published version
The MOBH35 metal-organic barrier heights reconsidered: performance of local-orbital coupled cluster approaches in different static correlation regimes
Creators: name: Semidalas, Emmanouil
name: Martin, Jan M. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We have revisited the MOBH35 (Metal-Organic Barrier Heights, 35 reactions) benchmark [Iron, M. A.; Janes, T. J. Phys. Chem. A 2019, 123 (17), 3761-3781; ibid. 2019, 123, 6379-6380] for realistic organometallic catalytic reactions, using both canonical CCSD(T) and localized orbital approximations to it. For low levels of static correlation, all of DLPNO-CCSD(T), PNO-LCCSD(T), and LNO-CCSD(T) perform well; for moderately strong levels of static correlation, DLPNO-CCSD(T) and (T1) may break down catastrophically, and PNO-LCCSD(T) is vulnerable as well. In contrast, LNO-CCSD(T) converges smoothly to the canonical CCSD(T) answer with increasingly tight convergence settings. The only two reactions for which our revised MOBH35 reference values differ substantially from the original ones are reaction 9 and to a lesser extent 8, both involving iron. For the purpose of evaluating DFT methods for MOBH35, it would be best to excise reaction 9 entirely as its severe level of static correlation is just too demanding a test. The magnitude of the difference between DLPNO-CCSD(T) and DLPNO-CCSD(T1) is a reasonably good predictor for errors in DLPNO-CCSD(T1) compared to canonical CCSD(T); [...]
description: J. Chem. Theor. Comput. 18, ASAP (2022). CC:BY 4.0. Dedicated to the memory of Shimon Vega (1943-2021)
Pretrattamenti termo-meccanici ed enzimatici su scarti dell'industria enologica per la produzione di Biogas
Physical and enzymatic conditioning of oenological wastes to improve biogas production
Creators: name: Bracchitta, Mirko <1983>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: CHIM/11 Chimica e biotecnologia delle fermentazioni

description: A fundamental assumption for by-product from winery industy waste-management is their economic and commercial increase in value. High energetic value recovery from winery industry is an attractive economic solution to stimulate new sustainable process. Approach of this work is based about physic and biological treatment with grape stalks and grape marc to increase polysaccharides components of cell wall and energetic availability of this by-products. Grape stalks for example have a high percentage of lignin and cellulose and can’t be used, whitout pretreatment, for an anaerobic digestion process. Our findings show enzymatic and thermo-mechanical pre-treatments in combined application for optimise hydrolytic mechanism on winemaking wastes which represents 0,9 milion ton/year in Italy and on straw, cereal by-products with high lignin content. A screening of specifically industrial enzymatic complex for the hydrolysis lignocellulosic biomass were tested using the principal polysaccharides component of the vegetal cells. Combined thermo-mechanical and enzymatic pretreatment improve substrates conversion in batch test fermentation experiment. The conservation of the grape stalks, at temperature above 0°C, allow the growth of spontaneus fermentation that reduce their polysaccharides content so had investigated anarobic condition of conservation. The other objective of this study was to investigate the capability of a proprietary strain of L.buchneri LN 40177 to enhance the accessibility of fermentable forage constituents during the anaerobic conservation process by releasing the enzyme ferulate esterase. The time sequence study by batch tests showed that the L. buchneri LN-40177 inoculated grape stalk substrate was more readily available in the fermenter. In batch tests with grape stalk, after mechanical treatment, the L. buchneri LN41077 treated substrate yielded on average 70% more biogas per kg/DM. Thermo-mechanical, enzymatic and biological treatment with L. buchneri LN-40177 can increase the biogas production from low fermented biomasses and the consequent their useful in anaerobic biodigesters for agro-bioenergy production.
Possible $Σ({1\over2}^-)$ under the $Σ^*(1385)$ peak in $KΣ^*$ photoproduction
Creators: name: Gao, Puze
name: Wu, Jia-Jun
name: Zou, B. S.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The LEPS collaboration has recently reported a measurement of the reaction $γn\to K^+Σ^{*-}(1385)$ with linearly polarized photon beam at resonance region. The observed beam asymmetry is sizably negative at $E_γ=1.8-2.4 \mathrm{GeV}$, in contrast to the presented theoretical prediction. In this paper, we calculate this process in the framework of the effective Lagrangian approach. By including a newly proposed $Σ(J^P={1\over2}^-)$ state with mass around 1380~MeV, the experimental data for both $γn$ and $γp$ experiments can be well reproduced. It is found that the $Σ({1\over2}^-)$ and/or the contact term may play important role and deserve further investigation.
description: modified version to be published at Phys. Rev. C
Towards A Resolution Of The Vacuum Energy Density Crisis
Creators: name: Oldershaw, R. L.
Publisher: name: arXiv
Year: 2009
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The theoretical vacuum energy density estimated on the basis of the Standard Model of particle physics and very general quantum assumptions is 59 to 123 orders of magnitude larger than the measured vacuum energy density for the observable universe which is determined on the basis of the Standard Model of cosmology and empirical data. This enormous disparity between the expectations of two of our most widely accepted theoretical frameworks demands a credible and self-consistent explanation, and yet even after decades of sporadic effort a generally accepted resolution of this crisis has not surfaced. Very recently, however, a discrete self-similar cosmological paradigm based on the fundamental principle of discrete scale invariance has been found to offer a rationale for reducing the vacuum energy density disparity by at least 115 orders of magnitude, and possibly this new paradigm offers a means of eliminating the vacuum energy density crisis entirely.
description: 13 pages, revisions requested by ApSS
Data Carpentry: Data Organization in Spreadsheets for Social Scientists workshop
Creators: name: Hettne, Kristina Maria
Publisher: name: Zenodo
Year: 2022
Subjects: Data Carpentry
Spreadsheets
Leiden University Libraries
Tidy Data
Research Data Management
Carpentries

description: Presentation based on the Data Carpentry lesson materials: Data Organization in Spreadsheets for Social Scientists and a presentation by Esther Plomp for a previous Data Carpentry workshop: https://doi.org/10.5281/zenodo.5593434
Additional file 6 of Barriers to and enablers of uptake of antiretroviral therapy in integrated HIV and tuberculosis treatment programmes in sub-Saharan Africa: a systematic review and meta-analysis
Creators: name: Kadia, Benjamin Momo
name: Dimala, Christian Akem
name: Fongwen, Noah T.
name: Smith, Adrian D.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 6. Subgroup analysis by study design.
Additional file 7 of Barriers to and enablers of uptake of antiretroviral therapy in integrated HIV and tuberculosis treatment programmes in sub-Saharan Africa: a systematic review and meta-analysis
Creators: name: Kadia, Benjamin Momo
name: Dimala, Christian Akem
name: Fongwen, Noah T.
name: Smith, Adrian D.
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Cell Biology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: Sociology
subject: FOS: Sociology
subject: Cancer
subject: Science Policy
subject: 110309 Infectious Diseases
subject: FOS: Health sciences
subject: Computational Biology

description: Additional file 7. Subgroup analysis by sample size.
Alternative implementation of the Higgs boson
Creators: name: Foot, Robert
name: Kobakhidze, Archil
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss an alternative implementation of the Higgs boson within the Standard Model which is possible if the renormalizability condition is relaxed. Namely, at energy scale $Λ$ the Higgs boson interacts at tree-level only with matter fermions, while the full gauge invariance is still maintained. The interactions with the electroweak gauge bosons are induced at low energies through the radiative corrections. In this scenario the Higgs boson can be arbitrarily heavy, interacting with the Standard Model fields arbitrarily weakly. No violation of unitarity in the scattering of longitudinal electroweak bosons occurs, since they become unphysical degrees of freedom at energies $Λ\sim \mathrm{TeV}$.
description: 7 pages. v2 - minor corrections; to be published in MPLA
Non-Fermi liquid behavior due to U(1) gauge field in two dimensions
Creators: name: Wang, Jing-Rong
name: Liu, Guo-Zhu
Publisher: name: arXiv
Year: 2009
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study the damping rate of massless Dirac fermions due to the U(1) gauge field in (2+1)-dimensional quantum electrodynamics. In the absence of a Maxwell term for the gauge field, the fermion damping rate $\mathrm{Im}Σ(ω,T)$ is found to diverge in both perturbative and self-consistent results. In the presence of a Maxwell term, there is still divergence in the perturbative results for $\mathrm{Im}Σ(ω,T)$. Once the Maxwell term is included into the self-consistent equations for fermion self-energy and vacuum polarization functions, the fermion damping rate is free of divergence and exhibits non-Fermi liquid behavior: $\mathrm{Im}Σ(ω,T) \propto \mathrm{max}(\sqrtω,\sqrt{T})$.
description: 16 pages, 7 figure, final version
On the Conditional Independence Implication Problem: A Lattice-Theoretic Approach
Creators: name: Niepert, Mathias
name: Van Gucht, Dirk
name: Gyssens, Marc
Publisher: name: arXiv
Year: 2008
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: A lattice-theoretic framework is introduced that permits the study of the conditional independence (CI) implication problem relative to the class of discrete probability measures. Semi-lattices are associated with CI statements and a finite, sound and complete inference system relative to semi-lattice inclusions is presented. This system is shown to be (1) sound and complete for saturated CI statements, (2) complete for general CI statements, and (3) sound and complete for stable CI statements. These results yield a criterion that can be used to falsify instances of the implication problem and several heuristics are derived that approximate this "lattice-exclusion" criterion in polynomial time. Finally, we provide experimental results that relate our work to results obtained from other existing inference algorithms.
Supertranslations at Timelike Infinity
Creators: name: Chakraborty, Sumanta
name: Ghosh, Debodirna
name: Hoque, Sk Jahanur
name: Khairnar, Aniket
name: Virmani, Amitabh
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We propose a definition of asymptotic flatness at timelike infinity in four spacetime dimensions. We present a detailed study of the asymptotic equations of motion and the action of supertranslations on asymptotic fields. We show that the Lee-Wald symplectic form $Ω(g, δ_1 g, δ_2 g)$ does not get contributions from future timelike infinity with our boundary conditions. As a result, the "future charges" can be computed on any two-dimensional surface surrounding the sources at timelike infinity. We present expressions for supertranslation and Lorentz charges.
description: 46 pages; v2 47 pages, refs + comments added, version to appear in JHEP
The reach of the ATLAS experiment in SUSY parameter space
Creators: name: Dietrich, Janet
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Already with very first data, the ATLAS experiment should be sensitive to a SUSY signal well beyond the regions explored by the Tevatron. We present a detailed study of the ATLAS discovery reach in the parameter space for various SUSY models. The expected uncertainties on the background estimates are taken ito account.
description: 4 pages, ICPP-Istanbul Conference proceedings, published in Balkan Physics Letters, Bogazici University Press BPL, 16 (1), pp. 86 - 89, 161013 (2009) and can be found on the Cern document server under: ATL-COM-PHYS-2008-191
Polarons and slow quantum phonons
Creators: name: Alvermann, Andreas
name: Fehske, Holger
name: Trugman, Stuart A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We describe the formation and properties of Holstein polarons in the entire parameter regime. Our presentation focuses on the polaron mass and radius, which we obtain with an improved numerical technique. It is based on the combination of variational exact diagonalization with an improved construction of phonon states, providing results even for the strong coupling adiabatic regime. In particular we can describe the formation of large and heavy adiabatic polarons. A comparison of the polaron mass for the one and three dimensional situation explains how the different properties in the static oscillator limit determine the behavior in the adiabatic regime. The transport properties of large and small polarons are characterized by the f-sum rule and the optical conductivity. Our calculations are approximation-free and have negligible numerical error. This allows us to give a conclusive and impartial description of polaron formation. We finally discuss the implications of our results for situations beyond the Holstein model.
description: Final version, 10 pages, 10 figures