cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
title: ÐÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð¸ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¿ÑÐ¾ÑÐ¾ÑÐ¸Ð¿Ð° Ð¸Ð½ÑÐµÑÐ½ÐµÑ Ð¿Ð»Ð°ÑÑÐ¾ÑÐ¼Ñ Ð´Ð»Ñ Ð¿ÑÐ¾Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð¼ÐµÐ´Ð¸ÑÐ¸Ð½ÑÐºÐ¾Ð³Ð¾ Ð¾Ð±Ð¾ÑÑÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Research and development of the prototype of the internet platform for the promotion of medical equipment
Creators: name: Ð¨ÐµÐ²ÑÐµÐ½ÐºÐ¾, ÐÐ½Ð°ÑÑÐ°ÑÐ¸Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2019
Subjects: ÐÐ½ÑÐµÑÐ½ÐµÑ
ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð½Ð°Ñ ÐºÐ¾Ð¼Ð¼ÐµÑÑÐ¸Ñ
Ð´ÐµÐºÐ¾Ð¼Ð¿Ð¾Ð·Ð¸ÑÐ¸Ñ Ð±Ð¸Ð·Ð½ÐµÑ-Ð¿ÑÐ¾ÑÐµÑÑÐ¾Ð²
seo
ÐºÐ¾Ð½Ð²ÐµÑÑÐ¸Ñ
ctr
ÐºÑÐ¸ÑÐ¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ°ÐºÑÐ¾Ñ ÑÑÐ¿ÐµÑ Ð°
e-commerce
decomposition of business processes
conversion
critical factor of success

description: ÐÐ±ÑÐµÐºÑÐ¾Ð¼ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð´Ð°Ð½Ð½Ð¾Ð¹ Ð¼Ð°Ð³Ð¸ÑÑÐµÑÑÐºÐ¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ Ð²ÑÑÑÑÐ¿Ð°ÐµÑ ÐÐÐ Â«ÐÐµÑÐºÑÑÐ¸Ð¹Â», ÑÐµÐ»ÑÑ ÑÐ°Ð±Ð¾ÑÑ â ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¿ÑÐ¾ÑÐ¾ÑÐ¸Ð¿Ð° Ð¸Ð½ÑÐµÑÐ½ÐµÑ-Ð¿Ð»Ð°ÑÑÐ¾ÑÐ¼Ñ Ð´Ð»Ñ Ð¿ÑÐ¾Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ Ð¼ÐµÐ´Ð¸ÑÐ¸Ð½ÑÐºÐ¾Ð³Ð¾ Ð¾Ð±Ð¾ÑÑÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ. ÐÐ»Ñ Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²ÐºÐ¸ Ð¿ÑÐ¾ÑÐ¾ÑÐ¸Ð¿Ð° Ð¿ÑÐ¾Ð²Ð¾Ð´Ð¸ÑÑÑ Ð°Ð½Ð°Ð»Ð¸Ð· ÑÐµÐºÑÑÐµÐ³Ð¾ ÑÑÐ½ÐºÐ° ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð½Ð¾Ð¹ ÐºÐ¾Ð¼Ð¼ÐµÑÑÐ¸Ð¸ Ð² Ð Ð¾ÑÑÐ¸Ð¸ Ð¸ Ð·Ð° ÑÑÐ±ÐµÐ¶Ð¾Ð¼, Ð° ÑÐ°ÐºÐ¶Ðµ Ð²ÑÑÐ²Ð»ÑÑÑÑÑ ÑÐ»Ð°Ð±ÑÐµ ÑÐ¾ÑÐºÐ¸ ÑÑÑÐµÑÑÐ²ÑÑÑÐ¸Ñ Ð¿Ð»Ð°ÑÑÐ¾ÑÐ¼ ÑÐµÑÐµÐ· Ð¿Ð¾ÑÑÑÐ¾ÐµÐ½Ð¸Ðµ Ð±Ð¸Ð·Ð½ÐµÑ-Ð¿ÑÐ¾ÑÐµÑÑÐ¾Ð² Ð¸ SWOT-Ð°Ð½Ð°Ð»Ð¸Ð·Ð°. ÐÐ° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð°Ð½Ð°Ð»Ð¸Ð· Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð½Ð¾Ð³Ð¾ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ, Ð²ÑÐ¿Ð¾Ð»Ð½ÑÐµÑÑÑ Ð¿Ð¾ÑÑÑÐ¾ÐµÐ½Ð¸Ðµ Ð¸ Ð´ÐµÐºÐ¾Ð¼Ð¿Ð¾Ð·Ð¸ÑÐ¸Ñ Ð±Ð¸Ð·Ð½ÐµÑ-Ð¿ÑÐ¾ÑÐµÑÑÐ¾Ð² Ð½Ð¾Ð²Ð¾Ð¹ Ð¿Ð»Ð°ÑÑÐ¾ÑÐ¼Ñ, Ð° ÑÐ°ÐºÐ¶Ðµ ÑÐ¾ÑÑÐ°Ð²Ð»ÐµÐ½ Ð¿Ð»Ð°Ð½ ÑÐ°Ð±Ð¾Ñ Ð¿Ð¾ Ð¿ÑÐ¾ÐµÐºÑÑ, Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð¾ ÑÐµÑÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ ÑÐºÑÐ°Ð½Ð½ÑÑ ÑÐ¾ÑÐ¼ Ð¸ Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²Ð»ÐµÐ½Ð¾ ÑÐµÑÐ½Ð¸ÐºÐ¾-ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¾Ðµ Ð¾Ð±Ð¾ÑÐ½Ð¾Ð²Ð°Ð½Ð¸Ðµ Ð²Ð½ÐµÐ´ÑÐµÐ½Ð¸Ñ.
description: The purpose of the work is the development of a prototype of Internet platform for the promotion of medical equipment. To analyze prototypes, an analysis of the current electronic communications market in Russia and abroad is required, as well as weak points of existing platforms through the construction of business processes and SWOT analysis. Based on the analysis of the studies conducted, the development and decomposition of the business processes of the new platform, and the work plan for the project was drawn up, tested by screen forms and prepared by a feasibility study for the implementation.
Infrared spectroscopy of the 2022 eruption of the recurrent nova U Sco
Creators: name: Evans, A.
name: Banerjee, D. P. K.
name: Woodward, C. E.
name: R., T.
name: Geballe
name: Gehrz, R. D.
name: Page, K. L.
name: Starrfield, S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present near-infrared spectroscopy of the 2022 eruption of the recurrent nova U Sco, over the period from 5.2 to 45.4 days after outburst. This is the most intensive infrared study of this nova. Our observations started early after the outburst and extended almost to the end of the ``Super Soft'' X-ray phase. A major find is the presence of coronal lines from day 9.41, one of the earliest appearances of these in any nova, classical or recurrent. The temperature of the coronal gas is $7\times10^5$ K. There is also evidence for the presence of much cooler ($\lesssim2.5\times10^4$ K) gas. Remarkable changes are seen in the HeI $1.083μ$m line, the strength of which declines, then recovers, in anti-correlation with the X-ray behaviour. We conclude that shock ionisation is the dominant excitation mechanism for the coronal line emission. There is evidence in the infrared spectra for the presence of black body emission at $\sim20000$ K, which we tentatively identify with the irradiated secondary, and for free-free/free-bound emission. For the previously determined binary inclination of $82.7$ degrees, the implied ejection velocities are as high as 22000 km s$^{-1}$. These velocities appear unprecedented in nova outflows, and are comparable to those seen in supernovae, thereby marking U Sco as a truly remarkable object.
description: Accepted for publication in MNRAS. This version replaces that posted on 2023 April 26, which had small offsets in the "Days from outburst"
Three-point correlation functions from semiclassical circular strings
Creators: name: Hernandez, Rafael
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The strong-coupling limit of three-point correlation functions of local operators can be analyzed beyond the supergravity regime using vertex operators representing spinning string states. When two of the vertex operators correspond to heavy string states having large quantum numbers, while the third operator corresponds to a light state with fixed charges, the correlator can be computed in the large string tension limit by means of a semiclassical approximation. We study the case when the heavy string states are circular string solutions with one AdS_5 spin and three different angular momenta along S^5, for several choices of the light string state.
description: 13 pages. Latex. v2: Misprints corrected and references added
Translation invariance, topology, and protection of criticality in chains of interacting anyons
Creators: name: Pfeifer, Robert N. C.
name: Buerschaper, Oliver
name: Trebst, Simon
name: Ludwig, Andreas W. W.
name: Troyer, Matthias
name: Vidal, Guifre
Publisher: name: arXiv
Year: 2010
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using finite size scaling arguments, the critical properties of a chain of interacting anyons can be extracted from the low energy spectrum of a finite system. In Phys. Rev. Lett. 98, 160409 (2007), Feiguin et al. showed that an antiferromagnetic (AFM) chain of Fibonacci anyons on a torus is in the same universality class as the tricritical Ising model, and that criticality is protected by a topological symmetry. In the present paper we first review the graphical formalism for the study of anyons on the disc and demonstrate how this formalism may be consistently extended to the study of systems on surfaces of higher genus. We then employ this graphical formalism to study finite rings of interacting anyons on both the disc and the torus, and show that analysis on the disc necessarily yields an energy spectrum which is a subset of that which is obtained on the torus. For a critical Hamiltonian, one may extract from this subset the scaling dimensions of the local scaling operators which respect the topological symmetry of the system. Related considerations are also shown to apply for open chains.
description: 31 pages, 36 figures, 4 tables, RevTeX 4.1. File size 1.8Mb as a PDF. Published in Phys. Rev. B
Project deliverable: Assessment report on online Cultural Literacy Learning Programme resources
Creators: name: Mayweg-Paus, Elisabeth
name: Zimmermann, Maria
name: Ruwe, Theresa
name: Maine, Fiona
name: Harrison, Fiona
name: Cook, Victoria
name: Peck, Julia
name: Gonçalves, Cláudia
name: Garcia, D'Jamila
name: Gil, Beatriz
name: Rapanta, Chrysi
name: Macagno, Fabrizio
name: Brandel, Noa
name: Cohen, Irit
name: Bietti, Lucas
name: Détienne, Françoise
name: Baker, Michael
Publisher: name: Zenodo
Year: 2021

description: Project deliverable on the assessment of online educational resources of DIALLS Cultural Literacy Learning Programme
Data-driven time-scale separation of ODE right-hand sides using dynamic mode decomposition and time delay embedding
Creators: name: Balos, Cody J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: G.1.7; G.4
subject: 34 (primary), 65 (secondary)

description: Multi-physics simulation often involve multiple different scales. The ARKODE ODE solver package in the SUNDIALS library addresses multi-scale problems with a multi-rate time-integrator that can work with a right-hand side that has fast scale and slow scale components. In this report, we use dynamic mode decomposition and time delay embedding to extract the fast and and slow components of the right-hand sides of a simple ODE from data. We then use the extracted components to solve the ODE with ARKODE. Finally, to move towards a real-world use case, we attempt to extract fast and slow scale dynamics from synthetic seismic modeling data.
Analysis of a de novo c-MYC-induced model of human acute myeloid leukemia
Creators: name: Bulaeva, Elizaveta
Publisher: name: University of British Columbia
Year: 2020

description: Human acute myeloid leukemias (AMLs) are a genetically and biologically diverse group of clonal hematologic malignancies in which abnormally differentiated hematopoietic cells expand excessively and are often characterized by MYC transcription factor overexpression. Current evidence suggests that the acquisition of genetic and epigenetic abnormalities by hematopoietic cells drives the disease. However, it is not known whether these genetic insults alone are sufficient for AML initiation, or from which cell types within the hematopoietic hierarchy the expansion of a leukemic clone can be initiated. To investigate these questions, I first undertook experiments to determine if it would be possible to initiate a leukemia from normal human CD34+ hematopoietic cells forced to overexpress MYC. Initial results showed their transplantation into immunodeficient mice genetically engineered to express human IL3, GM-CSF and SCF growth factors (GFs) resulted in the production of a rapidly fatal AML population, but this did not occur in hosts that did not express these human GFs. In fact, in mice not producing these GFs, the same MYC-transduced cells produced a normal spectrum of differentiating hematopoietic cell types for months. However, upon transfer into secondary GF-producing hosts, they rapidly initiated AML, demonstrating a critical role of these GFs in forcing the activation of a leukemogenic program long after expression of the oncogenic driver was initiated. Transplantation of MYC-transduced cells co-transduced with IL3 or GM-CSF or SCF individually into non-GF mice revealed IL3 and GM-CSF to have equivalent and exclusive AML-activating activity. Transplantation of GF-producing mice with different subsets of MYC-transduced CD34+ cells showed serially transplantable AML populations could be obtained at high efficiency from both primitive (CD34+CD38-) and mature granulopoietic progenitor cells (GMPs). Preliminary analysis of their properties further showed their cell surface phenotypes, transcriptomes, GF-dependence and content of in vitro clonogenic cells to be indistinguishable, and most like normal GMPs amongst different subsets of normal cord blood CD34+ cells. These results indicate that extrinsically-derived immunomodulatory signals can have an important role in eliciting a leukemogenic potential in human cells, and thus lay a foundation for improved understanding of the mechanisms involved in the establishment of human AML.
Unified Spin Order Theory via Gauge Landau-Lifshitz Equation
Creators: name: Li, You-Quan
name: Liu, Ye-Hua
name: Zhou, Yi
Publisher: name: arXiv
Year: 2011
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The continuum limit of the tilted SU(2) spin model is shown to give rise to the gauge Landau-Lifshitz equation which provides a unified description for various spin orders. For a definite gauge, we find a double periodic solution, where the conical spiral, in-plane spiral, helical, and ferromagnetic spin orders become special cases, respectively. For another gauge, we obtain the skyrmion-crystal solution. By simulating the influence of magnetic field and temperature for our covariant model, we find a spontaneous formation of skyrmion-fragment lattice and obtain a wider range of skyrmion-crystal phase in comparison to the conventional Dzyaloshinsky-Moriya model.
description: RevTeX4, 4 pages, 3 figures
Discontinuous percolation transitions in real physical systems
Creators: name: Cho, Y. S.
name: Kahng, B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We study discontinuous percolation transitions (PT) in the diffusion-limited cluster aggregation model of the sol-gel transition as an example of real physical systems, in which the number of aggregation events is regarded as the number of bonds occupied in the system. When particles are Brownian, in which cluster velocity depends on cluster size as $v_s \sim s^η$ with $η=-0.5$, a larger cluster has less probability to collide with other clusters because of its smaller mobility. Thus, the cluster is effectively more suppressed in growth of its size. Then the giant cluster size increases drastically by merging those suppressed clusters near the percolation threshold, exhibiting a discontinuous PT. We also study the tricritical behavior by controlling the parameter $η$, and the tricritical point is determined by introducing an asymmetric Smoluchowski equation.
description: 5 pages, 5 figures
A von Mises-Fisher Distribution for the Orbital Poles of the Plutinos
Creators: name: Matheson, Ian C.
name: Malhotra, Renu
name: Keane, James T.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Small solar system bodies have widely dispersed orbital poles, posing challenges to dynamical models of solar system origin and evolution. To characterize the orbit pole distribution of dynamical groups of small bodies it helps to have a functional form for a model of the distribution function. Previous studies have used the small-inclination approximation and adopted variations of the normal distribution to model orbital inclination dispersions. Because the orbital pole is a directional variable, its distribution can be more appropriately modeled with directional statistics. We describe the von Mises-Fisher (vMF) distribution on the surface of the unit sphere for application to small bodies' orbital poles. We apply it to the orbit pole distribution of the observed Plutinos. We find a mean pole located at inclination of 3.57 degrees and a longitude of ascending node of 124.38 degrees (in the J2000 reference frame), with a 99.7 per cent confidence cone of half-angle 1.68 degrees. We also estimate a debiased mean pole located 4.6 degrees away, at an inclination of 2.26 degrees and a longitude of ascending node of 292.69 degrees, of similar-size confidence cone. The vMF concentration parameter of Plutino inclinations (relative to either mean pole estimate) is 31.6. This resembles a Rayleigh distribution function with a width parameter of 10.2 degrees. Unlike previous models, the vMF model naturally accommodates all physical inclinations (and no others), whereas Rayleigh or Gaussian models must be truncated to the physical inclination range 0-180 degrees. Further work is needed to produce a theory for the mean pole of the Plutinos against which to compare the observational results.
description: 10 pages, 7 figures. Accepted for Monthly Notices of the Royal Astronomical Society (MNRAS) in April 2023
title: Eastern characters on the Elizabethan stage: uses and abuses
Creators: name: Alruwaili, Ahlam M.
Publisher: name: University of Glasgow
Year: 2021

description: In this study, I present representative samples of Eastern characters in four English plays of the late Elizabethan period. Pertinent historical material and travel narratives relating to contacts between West and East are consulted and used for support and contextualisation. Although I will be mainly focusing on the characters of the Moor and the Turk, at times my analysis will extend to cover Arabs and Saracens, non-Northern Africans, and Jews. My thesis investigates the socio-cultural and ideological roles that Eastern characters played in Elizabethan drama and their relation to English national concerns and issues during the 1580s and 1590s. These issues include the threat posed by Spain to England, the English succession crisis, international trade, politics, religious reform, relations with Catholic Europe, and with Moorish and Turkish dominions and powers. These issues are dramatised in the commercial playhouses where Eastern characters, though abused, seem to have enjoyed prominence during the last three decades of the sixteenth century. I will argue that although the plays were enacted in distant foreign settings, London theatres bring these Eastern figures closer to home to speak to one or more of the English concerns identified above. In the first chapter, I discuss the relationship between West and East prior to and during the Elizabethan period. I also note the presence of Easterners in England and Scotland. I then examine the uses and abuses of the figure of the Moor in recent scholarship. In the second chapter, I argue that George Peele’s The Battle of Alcazar (1588/1589) examines the English succession crisis in relation to the Moorish succession conflict in North Africa, an issue he also articulates in his contribution to Titus Andronicus. In the third chapter, I maintain that Robert Greene’s Alphonsus, King of Aragon (1587) addresses the same issue of succession in the play’s first part, and then exposes the dangers of political prophecy, popular in the 1580s, through the staging of heathen Moors and Turkish characters in a foreign setting. In the fourth chapter, I contend that Christopher Marlowe’s The Jew of Malta (1589) shows the ease with which religion can be exploited to fulfil personal ends through the corrupt actions of culturally suspect strangers of various faiths and ethnicities. In the last chapter, I analyse the figure of the Moor in Titus Andronicus (1594) within the context of the Spanish Black Legend. William Shakespeare and George Peele use the Goths and Aaron, the exaggerated Moor/Jew evil figure, to underscore the Moorish-Jewish mixed lineage of the early modern Spaniards and to undermine their claim to true faith (Roman Catholicism). In my conclusion I briefly look at a few Moors/Turks on the immediate Jacobean stage (1603-1625). Though the Moor seems to undergo a shift in gender and function (more women than men), she/he still epitomises devilish evil attributes.
Efficient modeling of error propagation in GPU programs
Creators: name: Anwer, Abdul Rehman
Publisher: name: University of British Columbia
Year: 2020

description: Graphics Processing Units (GPUs) are popular for reliability-conscious uses in High Performance Computing (HPC), machine learning algorithms, and safety-critical applications. Fault injection (FI) techniques are generally used to determine the reliability profiles of programs in the presence of soft errors. However, these techniques are highly resource- and time-intensive. GPU applications are highly multi-threaded and typically execute hundreds of thousands of threads, which makes it challenging to apply FI techniques. Prior research developed a model called TRIDENT to analytically predict Silent Data Corruption (SDC) (i.e., incorrect output without any indication) probabilities of single-threaded CPU applications, without requiring any FIs. Unfortunately, TRIDENT is incompatible with GPU programs, due to their high degree of parallelism and different memory architectures compared to CPU programs. The main challenge is that modeling error propagation across thousands of threads in a Graphics Processing Unit (GPU) kernel requires enormous amounts of data to be profiled and analyzed, posing a major scalability bottleneck for HPC applications. Further, there are GPU-specific behaviors that must be modeled for accuracy. In this thesis, we propose GPU-TRIDENT, an accurate and scalable technique for modeling error propagation in GPU programs. Our key insight is that error propagation across threads can be modeled based on program execution patterns. These can be characterized by control-flow, loop iteration, data, and thread block patterns of the GPU program. We also identify two major sources of inaccuracy in building analytical models of error propagation and mitigate them to improve accuracy. We find that GPU-TRIDENT can predict the SDC probabilities of both the overall GPU programs and individual instructions accurately, and is two orders of magnitude faster than FI-based approaches. We also demonstrate that GPUTRIDENT can guide selective instruction duplication to protect GPU programs similar to FI. We also deploy GPU-TRIDENT to assess the input-dependence of reliability of GPU kernels and find that the SDC probability of kernels is generally insensitive to variation in inputs.
Full electrical control of Charge and Spin conductance through Interferometry of Edge States in Topological Insulators
Creators: name: Dolcini, Fabrizio
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate electron interferometry of edge states in Topological Insulators. We show that, when inter-boundary coupling is induced at two quantum point contacts of a four terminal setup, both Fabry-Pérot-like and Aharonov-Bohm-like loop processes arise. These underlying interference effects lead to a full electrically controllable system, where the magnitude of charge and spin linear conductances can be tuned by gate voltages, without applying magnetic fields. In particular we find that, under appropriate conditions, inter-boundary coupling can lead to negative values of the conductance. Furthermore, the setup also allows to selectively generate pure charge or pure spin currents, by choosing the voltage bias configuration.
description: 12 pages, 5 figures (expanded discussion section, corrected typos)
Constraining the quintessential $α$-attractor inflation through dynamical horizon exit method
Creators: name: Sarkar, Arunoday
name: Ghosh, Buddhadeb
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In the present paper, we perform a sub-Planckian quantum mode analysis of linear cosmological perturbation in the inflaton field over a classical quasi de-Siter metric background by dynamical horizon exit (DHE) method. In this way, we probe the inflationary regime of a quintessential $α$-attractor model by analysing the COBE/Planck normalized power spectra, spectral indices, tensor to scalar ratio, number of e-folds, running of the spectral index and inflationary Hubble parameter in $k$-space. We compare our results with ordinary $α$-attractor $E$ and $T$ models and with that of Planck-2018 results. Our estimated values of $n_s$ and $r$ lie within $68\%$ CL with respect to Planck data for $k=0.001 - 0.009$ Mpc$^{-1}$ for all values of $α$. The $α$ values, obtained in our calculations satisfy various post inflationary constraints regarding preheating and reheating, reported in current literature. We observe that quintessence sets an upper bound of $α=4.3$ and thereby restricts the model from becoming of the power law type, making it more efficacious than ordinary $α$-attractors in explaining both inflation and dark energy. A striking observation in our analyses is that, unlike in our previous study, we find a continuous values of $α$ within $\frac{1}{10}\leq α\leq 4.3$ for the specified $k$ range. At the end, we have shown that the model parameters constrained in this work give a very small vacuum density $\sim 10^{-117}-10^{-115} M_P^4$ which is an essential criterion for current and future dark energy observations of the universe.
description: 46 pages, 20 figures, 2 tables
Black holes without Cauchy horizons and integrable singularities
Creators: name: Ovalle, Jorge
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In general relativity, nonsingular black holes contain (at least) a Cauchy horizon, a null hypersurface beyond which determinism breaks down. Even though the strong cosmic censorship conjecture establishes the impossibility of extending spacetime beyond this region, in this paper we investigate how far we can go, without invoking this conjecture, in the building of a physically reasonable black hole without a Cauchy hypersurface. Following this reasoning, we find a black hole lacking of Cauchy horizon, asymptotically flat and satisfying either the strong or dominant energy condition. The above is possible by demanding integrable singularity for the Ricci scalar, whose direct consequence is the appearance of finite tidal forces. We show that the spacetime inside the event horizon represents a warped anti-de Sitter spacetime, which might be interpreted in terms of a finite superposition of configurations.
description: 5 pages
title: The influence of compensation interdependence on risk-taking : the role of mutual monitoring
Creators: name: Bolduan, Felix
name: Schedlinsky, Ivo
name: Sommer, Friedrich
Publisher: name: University of Bayreuth
Year: 2021
Subjects: subject: Risk-taking
subject: Compensation interdependence
subject: Mutual monitoring
subject: Impression Management
subject: Social reasoning
subject: 330

description: This study investigates if and how the influence of compensation interdependence on risk-taking depends on mutual monitoring of risky investment decisions. We argue that individuals under compensation interdependence have a behavioral incentive for higher risk-taking if mutual monitoring is present. Impression management is hypothesized to be the driving force behind this effect, with the visibility of actions to the peers through mutual monitoring as an important prerequisite. The results of a laboratory experiment support our predictions. Additional analyses reveal that impression management drives our results because participants incorporate their peers’ preferences in their decision process. This reasoning is further substantiated as individuals increase their risk-taking if they took less risk than their peers in previous experimental rounds and thus adjust to their respective peer group. Our findings inform firms about the effect of compensation interdependence in working environments with differing opportunities for mutual monitoring.
Challenges and experiences of Agricultural Research Council of Nigeria (ARCN) in making agricultural research work for end-users in Nigeria
Creators: name: Ambrose Alikidon Voh (Jr.)
name: Ambrose Alikidon Voh (Jr.)
Publisher: name: Unknown
Year: 2017
Subjects: subject: Research and Development/Tech Change/Emerging Technologies
subject: Agricultural Research
subject: Multi-stake holders approach
subject: Agricultural policy
subject: Barriers to agricultural research

description: The study reviewed the role of agricultural research in policy making for agricultural development in Nigeria. It specifically identified the salient challenges associated with making agricultural research work for end-users in Nigeria and proffered some solutions using the example of some initiatives implemented by the Agricultural Research Council of Nigeria, ARCN. The major end-users of agricultural research in Nigeria identified include: Research scientists and organizations, training and extension agents/organizations, farmers, industries (producers, consumers and cooperative organizations and policy makers). The major challenges identified include: issues with Funding of research and extension systems, Weak linkage between research, extension and farmers/industries, absence of appropriate communication Strategies and Conflicting expectations from research by various end-user groups. The study noted that the barriers to making agricultural research work for end-users must be addressed via multiple actions at all fronts. The experience of ARCN demonstrated that involvement of end-users in the process of technologies development to solve their challenges enhanced their sense of ownership and makes them more receptive. It has also be confirmed that multi-pronged approach to dissemination of agricultural research results would contribute significantly to making research technologies work for the end-users.
Global Quantum Discord in Multipartite Systems
Creators: name: Rulli, C. C.
name: Sarandy, M. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We propose a global measure for quantum correlations in multipartite systems, which is obtained by suitably recasting the quantum discord in terms of relative entropy and local von Neumann measurements. The measure is symmetric with respect to subsystem exchange and is shown to be non-negative for an arbitrary state. As an illustration, we consider tripartite correlations in the Werner-GHZ state and multipartite correlations at quantum criticality. In particular, in contrast with the pairwise quantum discord, we show that the global quantum discord is able to characterize the infinite-order quantum phase transition in the Ashkin-Teller spin chain.
description: v3: 7 pages, 6 figures. Published version
The relation between post-shock temperature, cosmic-ray pressure and cosmic-ray escape for non-relativistic shocks
Creators: name: Vink, Jacco
name: Yamazaki, R.
name: Helder, E. A.
name: Schure, K. M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Supernova remnants are thought to be the dominant source of Galactic cosmic rays. This requires that at least 5% of the available energy is transferred to cosmic rays, implying a high cosmic-ray pressure downstream of supernova remnant shocks. Recently, it has been shown that the downstream temperature in some remnants is low compared to the measured shock velocities, implying that additional pressure support by accelerated particles is present. Here we use a two-fluid thermodynamic approach to derive the relation between post-shock fractional cosmic-ray pressure and post-shock temperature, assuming no additional heating beyond adiabatic heating in the shock precursor and with all non-adiabatic heating occurring at the subshock. The derived relations show that a high fractional cosmic-ray pressure is only possible, if a substantial fraction of the incoming energy flux escapes from the system. Recently a shock velocity and a downstream proton temperature were measured for a shock in the supernova remnant RCW 86. We apply the two-fluid solutions to these measurements and find that the the downstream fractional cosmic-ray pressure is at least 50% with a cosmic-ray energy flux escape of at least 20%. In general, in order to have 5% of the supernova energy go into accelerating cosmic rays, on average the post-shock cosmic-ray pressure needs to be 30% for an effective cosmic-ray adiabatic index of 4/3.
description: 9 pages, 6 color figures. This is updated with a corrected figure 5a and 5b, reflecting an ApJ erratum
Symmetry Analysis for the Ruddlesden-Popper Systems, Ca3Mn2O7 and Ca3Ti2O7
Creators: name: Harris, A. B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We perform a symmetry analysis of the zero-temperature instabilities of the tetragonal phase of Ca3Mn2O7 and Ca3Ti2O7 which is stable at high temperature. We introduce order parameters to characterize each of the possible lattice distortions in order to construct a Landau free energy which elucidates the proposed group-subgroup relations for structural transitions in these systems. We include the coupling between the unstable distortion modes and the macroscopic strain tensor. We also analyze the symmetry of the dominantly antiferromagnetic ordering which allows weak ferromagnetism. We show that in this phase the weak ferromagnetic moment and the spontaneous ferroelectric polarization are coupled, so that rotating one of these ordering by applying an external electric or magnetic field one can rotate the other ordering. We discuss the number of different domains (including phase domains) which exist in each of the phases and indicate how these may be observed.
description: 21 pages, 14 figures
New energy inequalities for tensorial wave equations on spacetimes that satisfy a one-sided bound
Creators: name: Burtscher, Annegret Y.
name: Grant, James D. E.
name: LeFloch, Philippe G.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We consider several tensorial wave equations, specifically the equations of Maxwell, Yang-Mills, and Weyl fields, posed on a curved spacetime, and we establish new energy inequalities under certain one-sided geometric conditions. Our conditions restrict the lapse function and deformation tensor of the spacetime foliation, and turn out to be a one-sided and integral generalization of conditions recently proposed by Klainerman and Rodnianski as providing a continuation criterion for Einstein's field equations of general relativity. As we observe it here for the first time, one-sided conditions are sufficient to derive energy inequalities for certain tensorial equations, provided one takes advantage of some algebraic properties enjoyed by the natural energy functionals associated with the equations under consideration. Our method especially applies to the Bel-Robinson energy for Weyl fields, and our inequalities control the growth of the energy in a uniform way, with implied constants depending on the one-sided geometric bounds, only.
description: 17 pages
Conformal designs and D.H. Lehmer's conjecture
Creators: name: Miezaki, Tsuyoshi
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Algebra (math.QA)
subject: Combinatorics (math.CO)
subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 17B69 (Primary) 05E99 (Secondary) 11F03 (Tertiary)

description: In 1947, Lehmer conjectured that the Ramanujan τ-function τ(m) is non-vanishing for all positive integers m, where τ(m) are the Fourier coefficients of the cusp form Δof weight 12. It is known that Lehmer's conjecture can be reformulated in terms of spherical t-design, by the result of Venkov. In this paper, we show that τ(m) = 0 is equivalent to the fact that the homogeneous space of the moonshine vertex operator algebra (V^\natural)_{m+1} is a conformal 12-design. Therefore, Lehmer's conjecture is now reformulated in terms of conformal t-designs.
description: 9 pages
Comparing, Optimising and Benchmarking Quantum Control Algorithms in a Unifying Programming Framework
Creators: name: Machnes, S.
name: Sander, U.
name: Glaser, S. J.
name: de Fouquieres, P.
name: Gruslys, A.
name: Schirmer, S.
name: Schulte-Herbrueggen, T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: For paving the way to novel applications in quantum simulation, computation, and technology, increasingly large quantum systems have to be steered with high precision. It is a typical task amenable to numerical optimal control to turn the time course of pulses, i.e. piecewise constant control amplitudes, iteratively into an optimised shape. Here, we present the first comparative study of optimal control algorithms for a wide range of finite-dimensional applications. We focus on the most commonly used algorithms: GRAPE methods which update all controls concurrently, and KROTOV-type methods which do so sequentially. Guidelines for their use are given and open research questions are pointed out. --- Moreover we introduce a novel unifying algorithmic framework, DYNAMO (dynamic optimisation platform) designed to provide the quantum-technology community with a convenient MATLAB-based toolset for optimal control. In addition, it gives researchers in optimal-control techniques a framework for benchmarking and comparing new proposed algorithms to the state-of-the-art. It allows for a mix-and-match approach with various types of gradients, update and step-size methods as well as subspace choices. Open-source code including examples is made available at http://qlib.info.
description: update incl. 3 new figures, comments welcome
Dynamics and thermalization in correlated one-dimensional lattice systems
Creators: name: Rigol, Marcos
Publisher: name: arXiv
Year: 2010
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We review exact approaches and recent results related to the relaxation dynamics and description after relaxation of various one-dimensional lattice systems of hard-core bosons after a sudden quench. We first analyze the integrable case, where the combination of analytical insights and computational techniques enable one to study large system sizes. Thermalization does not occur in this regime. However, after relaxation, observables can be described by a generalization of the Gibbs ensemble. We then utilize full exact diagonalization to study what happens as integrability is broken. We show that thermalization does occur in finite nonintegrable systems provided they are sufficiently far away from the integrable point. We argue that the onset of thermalization can be understood in terms of the eigenstate thermalization hypothesis.
description: 14 pages, 4 figures, unedited version of the chapter published in http://www.icpress.co.uk/physics/p817.html
A Factorization Theorem for $φ$--Maps
Creators: name: Skeide, Michael
Publisher: name: arXiv
Year: 2010
Subjects: subject: Operator Algebras (math.OA)
subject: FOS: Mathematics
subject: 46L08, 46L53, 60G25, 46L55

description: We present a far reaching generalization of a factorization theorem by Bhat, Ramesh, and Sumesh (stated first by Asadi) and furnish a very quick proof.
description: Reivised according to the referee's suggestions (now 5 pages); to appear in Journal of Operator Theory
Timescales of Chaos in the Inner Solar System: Lyapunov Spectrum and Quasi-integrals of Motion
Creators: name: Mogavero, Federico
name: Hoang, Nam H.
name: Laskar, Jacques
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Chaotic Dynamics (nlin.CD)
subject: Classical Physics (physics.class-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Numerical integrations of the Solar System reveal a remarkable stability of the orbits of the inner planets over billions of years, in spite of their chaotic variations characterized by a Lyapunov time of only 5 million years and the lack of integrals of motion able to constrain their dynamics. To open a window on such long-term behavior, we compute the entire Lyapunov spectrum of a forced secular model of the inner planets. We uncover a hierarchy of characteristic exponents that spans two orders of magnitude, manifesting a slow-fast dynamics with a broad separation of timescales. A systematic analysis of the Fourier harmonics of the Hamiltonian, based on computer algebra, reveals three symmetries that characterize the strongest resonances responsible for the orbital chaos. These symmetries are broken only by weak resonances, leading to the existence of quasi-integrals of motion that are shown to relate to the smallest Lyapunov exponents. A principal component analysis of the orbital solutions independently confirms that the quasi-integrals are among the slowest degrees of freedom of the dynamics. Strong evidence emerges that they effectively constrain the chaotic diffusion of the orbits, playing a crucial role in the statistical stability over the Solar System lifetime.
description: 24 pages, 11 figures. Published in Physical Review X
On a relativistic Fokker-Planck equation in kinetic theory
Creators: name: Félix, José Antonio Alcántara
name: Calogero, Simone
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Analysis of PDEs (math.AP)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: A relativistic kinetic Fokker-Planck equation that has been recently proposed in the physical literature is studied. It is shown that, in contrast to other existing relativistic models, the one considered in this paper is invariant under Lorentz transformations in the absence of friction. A similar property (invariance by Galilean transformations in the absence of friction) is verified in the non-relativistic case. In the first part of the paper some fundamental mathematical properties of the relativistic Fokker-Planck equation are established. In particular, it is proved that the model is compatible with the finite propagation speed of particles in relativity. In the second part of the paper, two non-linear relativistic mean-field models are introduced. One is obtained by coupling the relativistic Fokker-Planck equation to the Maxwell equations of electrodynamics, and is therefore of interest in plasma physics. The other mean-field model couples the Fokker-Planck dynamics to a relativistic scalar theory of gravity (the Nordström theory) and is therefore of interest in gravitational physics. In both cases the existence of steady states for all possible prescribed values of the mass is established. In the gravitational case this result is better than for the corresponding non-relativistic model, the Vlasov-Poisson-Fokker-Planck system, for which existence of steady states is known only for small mass.
description: 30 pages, no figures (New version contains more references; typos corrected)
Integral equations for the four-body problem
Creators: name: Mora, Christophe
name: Castin, Yvan
name: Pricoupenko, Ludovic
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: FOS: Physical sciences

description: We consider the four-boson and 3+1 fermionic problems with a model Hamiltonian which encapsulates the mechanism of the Feshbach resonance involving the coherent coupling of two atoms in the open channel and a molecule in the closed channel. The model includes also the pair-wise direct interaction between atoms in the open channel and in the bosonic case, the direct molecule-molecule interaction in the closed channel. Interactions are modeled by separable potentials which makes it possible to reduce the four-body problem to the study of a single integral equation. We take advantage of the rotational symmetry and parity invariance of the Hamiltonian to reduce the general eigenvalue equation in each angular momentum sector to an integral equation for functions of three real variables only. A first application of this formalism in the zero-range limit is given elsewhere [Y. Castin, C. Mora, L. Pricoupenko, Phys. Rev. Lett. 105, 223201 (2010)].
description: 17 pages, 0 figure, to appear in Comptes Rendus Physique (2011)
title: Ð Ð°ÑÑÑÑ Ð¼ÑÐ½Ð¸ÑÐ¸Ð¿Ð°Ð»ÑÐ½ÑÑ ÑÐ°ÑÑ Ð¾Ð´Ð¾Ð² Ð´Ð»Ñ ÐºÐ¾ÑÑÐµÐ´Ð¶Ð½Ð¾Ð³Ð¾ Ð¿Ð¾ÑÑÐ»ÐºÐ°
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Calculation of municipal expenses for a cottage settlement
Creators: name: Ð ÐµÑÐº, ÐÐ³Ð¾Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: ÐºÐ¾ÑÑÐµÐ´Ð¶Ð½ÑÐ¹ Ð¿Ð¾ÑÑÐ»Ð¾Ðº
Ð±Ð»Ð°Ð³Ð¾ÑÑÑÑÐ¾Ð¹ÑÑÐ²Ð¾
Ð¾Ð·ÐµÐ»ÐµÐ½ÐµÐ½Ð¸Ðµ
Ð¾ÑÐ²ÐµÑÐµÐ½Ð¸Ðµ
ÑÐµÐºÑÐµÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ Ð·Ð¾Ð½Ð°
Ð¼ÑÐ½Ð¸ÑÐ¸Ð¿Ð°Ð»ÑÐ½Ð¾Ðµ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ðµ
cottage settlement
landscaping
lighting
recreation area
municipal management

description: Ð Ð´Ð°Ð½Ð½Ð¾Ð¹ Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½ Ð¿Ð»Ð°Ð½ ÐºÐ¾ÑÑÐµÐ´Ð¶Ð½Ð¾Ð³Ð¾ Ð¿Ð¾ÑÐµÐ»ÐºÐ° Ñ Ð·Ð¾Ð½Ð°Ð¼Ð¸ Ð¾ÑÐ´ÑÑÐ°, Ð´ÐµÑÑÐºÐ¸Ð¼Ð¸ Ð¸ ÑÐ¿Ð¾ÑÑÐ¸Ð²Ð½ÑÐ¼Ð¸ Ð¿Ð»Ð¾ÑÐ°Ð´ÐºÐ°Ð¼Ð¸. ÐÑÐ»Ð¸ Ð·Ð°Ð¿ÑÐ¾ÐµÐºÑÐ¸ÑÐ¾Ð²Ð°Ð½Ñ Ð»Ð¸Ð²Ð½ÐµÐ²Ð°Ñ Ð¸ Ð´ÑÐµÐ½Ð°Ð¶Ð½Ð°Ñ ÑÐ¸ÑÑÐµÐ¼Ñ Ð²Ð¾Ð´Ð¾Ð¾ÑÐ²ÐµÐ´ÐµÐ½Ð¸Ñ. Ð¢Ð°ÐºÐ¶Ðµ Ð±ÑÐ»Ð¸ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ñ Ð¿ÐµÑÐµÑÐ½Ð¸ Ð¼ÐµÑÐ¾Ð¿ÑÐ¸ÑÑÐ¸Ð¹ Ð¿Ð¾ Ð±Ð»Ð°Ð³Ð¾ÑÑÑÑÐ¾Ð¹ÑÑÐ²Ñ ÑÐµÑÑÐ¸ÑÐ¾ÑÐ¸Ð¸ Ð² ÐºÐ¾ÑÑÐµÐ´Ð¶Ð½Ð¾Ð¼ Ð¿Ð¾ÑÐµÐ»ÐºÐµ Ð¸ ÑÐ°ÑÑÑÐ¸ÑÐ°Ð½Ð° ÑÑÐ¾Ð¸Ð¼Ð¾ÑÑÑ Ð¼Ð°ÑÐµÑÐ¸Ð°Ð»Ð¾Ð² Ð¸ ÑÐ°Ð±Ð¾Ñ Ð¿Ð¾ Ð±Ð»Ð°Ð³Ð¾ÑÑÑÑÐ¾Ð¹ÑÑÐ²Ñ.
description: In this graduation qualifying work, a plan of a cottage village with recreation areas, children's and sports grounds has been developed. Storm water and drainage systems were designed. Also, lists of measures for the improvement of the territory in the cottage settlement were developed and the cost of materials and works on improvement was calculated.
Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
Creators: name: Haardt, Francesco
name: Madau, Piero
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present improved synthesis models of the evolving spectrum of the UV/X-ray diffuse background, updating and extending our previous results. Five new main components are added to our radiative transfer code CUBA: (1) the sawtooth modulation of the background intensity from resonant line absorption in the Lyman series of cosmic hydrogen and helium; (2) the X-ray emission from obscured and unobscured quasars; (3) a piecewise parameterization of the distribution in redshift and column density of intergalactic absorbers that fits recent measurements of the mean free path of 1 ryd photons; (4) an accurate treatment of the photoionization structure of absorbers; and (5) the UV emission from star-forming galaxies at all redshifts. We provide tables of the predicted HI and HeII photoionization and photoheating rates for use, e.g., in cosmological hydrodynamics simulations of the Lya forest, and a new metallicity-dependent calibration to the UV luminosity density-star formation rate density relation. A "minimal cosmic reionization model" is also presented in which the galaxy UV emissivity traces recent determinations of the cosmic history of star formation, the luminosity-weighted escape fraction of hydrogen-ionizing radiation increases rapidly with lookback time, the clumping factor of the high-redshift intergalactic medium evolves following the results of recent hydrodynamic simulations, and Population III stars and miniquasars make a negligible contribution to the metagalactic flux. The model provides a good fit to the hydrogen-ionization rates inferred from flux decrement and proximity effect measurements, predicts that cosmological HII (HeIII) regions overlap at redshift 6.7 (2.8), and yields an optical depth to Thomson scattering that is in agreement with WMAP results. (Abridged)
description: 28 pages, 17 figures, accepted for publication in The Astrophysical Journal
Randomness extraction and asymptotic Hamming distance
Creators: name: Freer, Cameron E.
name: Kjos-Hanssen, Bjoern
Publisher: name: arXiv
Year: 2010
Subjects: subject: Logic (math.LO)
subject: Computational Complexity (cs.CC)
subject: Information Theory (cs.IT)
subject: Logic in Computer Science (cs.LO)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We obtain a non-implication result in the Medvedev degrees by studying sequences that are close to Martin-Löf random in asymptotic Hamming distance. Our result is that the class of stochastically bi-immune sets is not Medvedev reducible to the class of sets having complex packing dimension 1.