cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Wilson Loop-Loop Correlators in AdS/QCD
Creators: name: Nian, J.
name: Pirner, H. J.
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 calculate the expectation value of one circular Wilson loop and the correlator of two concentric circular Wilson loops in AdS/QCD using the modified AdS_5-metric given in Ref.[1]. The confinement properties of this metric in AdS/QCD are analyzed and compared with QCD and Nambu-Goto theory in four dimensions.
description: 22 pages, 14 figures
Controlling Optical and Catalytic Activity of Genetically Engineered Proteins by Ultrasound
Creators: name: Zhou, Yu
name: Huo, Shuaidong
name: Loznik, Mark
name: Göstl, Robert
name: Boersma, Arnold J.
name: Herrmann, Andreas
Publisher: name: Weinheim : Wiley-VCH
Year: 2021
Subjects: subject: enzymes
subject: fluorescence
subject: mechanochemistry
subject: protein engineering
subject: ultrasound
subject: 540

description: Ultrasound (US) produces cavitation-induced mechanical forces stretching and breaking polymer chains in solution. This type of polymer mechanochemistry is widely used for synthetic polymers, but not biomacromolecules, even though US is biocompatible and commonly used for medical therapy as well as in vivo imaging. The ability to control protein activity by US would thus be a major stepping-stone for these disciplines. Here, we provide the first examples of selective protein activation and deactivation by means of US. Using GFP as a model system, we engineer US sensitivity into proteins by design. The incorporation of long and highly charged domains enables the efficient transfer of force to the protein structure. We then use this principle to activate the catalytic activity of trypsin by inducing the release of its inhibitor. We expect that this concept to switch “on” and “off” protein activity by US will serve as a blueprint to remotely control other bioactive molecules. © 2020 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH
HELIX: From Math to Verified Code
Creators: name: Zaliva, Vadim
Publisher: name: Carnegie Mellon University
Year: 2021
Subjects: Computer Engineering

description: This thesis presents HELIX, a code generation and formal verification system with a focus on the intersection of high-performance and high-assurance numerical computing.This allowed us to build a system that could be ?ne-tuned to generate efficient code for a broad set of computer architectures while providing formal guarantees ofsuch generated code's correctness. The method we used for high-performance code synthesis is the algebraictransformation of vector and matrix computations into a dataow optimized for parallel or vectorized processing on target hardware. The abstraction used to formalize and verify this technique is an operator language used with semantics-preserving term-rewriting. We use sparse vector abstraction to represent partial computations, enabling us to use algebraic reasoning to prove parallel decomposition properties. HELIX provides a formal verification foundation for rewriting-based algebraic code synthesis optimizations, driven by an external oracle. Presently HELIX uses SPIRAL as an oracle deriving the rule application order. The SPIRAL system was developed over the years and successfully applied to generate code for various numeric algorithms. Building on its sound algebraic foundation, we generalize and extend it in the direction of non-linear operators, towards a new theory of partial computations, applying formal language theory and formal verification techniques.HELIX is developed and proven in Coq proof assistant and demonstrated on a real-life example of verified high-performance code generation of the dynamic window safety monitor for a cyber-physical robot system.
Rapid dust production in submillimeter galaxies at z>4?
Creators: name: Michałowski, Michał J.
name: Watson, Darach
name: Hjorth, Jens
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The existence of submillimeter-selected galaxies (SMGs) at redshifts z>4 has recently been confirmed. Using simultaneously all the available data from UV to radio we have modeled the spectral energy distributions of the six known spectroscopically confirmed SMGs at z>4. We find that their star formation rates (average ~2500 MSun yr^{-1}), stellar (~3.6x10^{11} MSun) and dust (~6.7x10^{8} MSun) masses, extinction (A_V~2.2 mag), and gas-to-dust ratios (~60) are within the ranges for 1.74 and lower-redshift SMGs. Those at z>4 tend to be among the most star-forming, least massive and hottest (~60 K) SMGs and exhibit the highest fraction of stellar mass formed in the ongoing starburst (~45%). This indicates that at z>4 we see earlier stages of evolution of submillimeter-bright galaxies. Using the derived properties for z>4 SMGs we investigate the origin of dust at epochs less than 1.5 Gyr after the big bang. This is significant to our understanding of the evolution of the early universe. For three z>4 SMGs, asymptotic giant branch stars could be the dominant dust producers. However, for the remaining three only supernovae (SNe) are efficient and fast enough to be responsible for dust production, though requiring a very high dust yield per SN (0.15-0.65 MSun). The required dust yields are lower if a top-heavy initial mass function or significant dust growth in the interstellar medium is assumed. We estimate lower limits of the contribution of SMGs to the cosmic star formation and stellar mass densities at z~4-5 to be ~4% and ~1%, respectively.
description: Published in ApJ. 10 pages, 2 figures, 5 tables. Table 1 and 2 can be found in the source file in the machine-readable form. For SED templates, see http://archive.dark-cosmology.dk/ or the source file. V2: minor changes to match the published version.
Researching cycling safety : using cyclists perceptions and other measures to make recommendations for Sandy Bay, Tasmania
Creators: name: Jitprapaikulsarn, S
Publisher: name: University Of Tasmania
Year: 2023

description: The promotion of safety for cycling is a significant strategy in order to encourage use of the bicycle as a mode of daily transport. Black spots, cyclists' perceptions of danger and bicycle suitability criteria have been used in many other places to assist identifying locations requiring improvement for safer cycling. It is not clear that these criteria and perceptions can actually identify where bicycle accidents are likely to occur, when black spots are excluded from the process. Finding the relationship between the number of bicycle accidents and cyclists' perceptions of danger is an aim of this study. Using their own perception of danger, only 3% of cyclists could predict the occurrence of bicycle accidents at intersections, while 26% could predict the occurrence of bicycle accidents on street sections. Therefore, on street sections, cyclists' perception of danger is a useful clement in order to anticipate the bicycle accident rate. Cyclists' perceptions are only one indicator of the locations where bicycle accidents are likely to occur: other factors require further investigation. The Sandy Bay area has the highest rate of bicycle commuters in Hobart, Tasmania. With the potential to increase bicycle use if safer environments are provided. A questionnaire undertaken by the author shows that around 86% of cyclists think some streets within the study area are dangerous. GIS was used to identify the bicycle accident places and the dangerous locations. The most dangerous streets, known from records of accidents publicly available, were Sandy Bay Road, Regent Street, and Churchill Avenue. Cyclists also said that these needed most improvement for safer cycling. The creation of bicycle lanes, especially on Sandy Bay Road, Regent Street, and Churchill Avenue, was the major requirement. Street-based fieldwork was undertaken to measure the width of these three streets and their footpaths. The width of Sandy Bay Road and Churchill Avenue within the study area can accommodate dedicated bicycle lanes on both sides, but not Regent Street. In spite of this recommendation, the most effective method found to date has been the reduction of speed limits for all vehicles to 30 km/h, as in many European countries, but not in Australia.
LGFN: Lightweight Light Field Image Super-Resolution using Local Convolution Modulation and Global Attention Feature Extraction
Creators: name: Yu, Zhongxin
name: Chen, Liang
name: Zeng, Zhiyun
name: Yang, Kunping
name: Luo, Shaofei
name: Chen, Shaorui
name: Zhong, Cheng
Publisher: name: arXiv
Year: 2024
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Capturing different intensity and directions of light rays at the same scene Light field (LF) can encode the 3D scene cues into a 4D LF image which has a wide range of applications (i.e. post-capture refocusing and depth sensing). LF image super-resolution (SR) aims to improve the image resolution limited by the performance of LF camera sensor. Although existing methods have achieved promising results the practical application of these models is limited because they are not lightweight enough. In this paper we propose a lightweight model named LGFN which integrates the local and global features of different views and the features of different channels for LF image SR. Specifically owing to neighboring regions of the same pixel position in different sub-aperture images exhibit similar structural relationships we design a lightweight CNN-based feature extraction module (namely DGCE) to extract local features better through feature modulation. Meanwhile as the position beyond the boundaries in the LF image presents a large disparity we propose an efficient spatial attention module (namely ESAM) which uses decomposable large-kernel convolution to obtain an enlarged receptive field and an efficient channel attention module (namely ECAM). Compared with the existing LF image SR models with large parameter our model has a parameter of 0.45M and a FLOPs of 19.33G which has achieved a competitive effect. Extensive experiments with ablation studies demonstrate the effectiveness of our proposed method which ranked the second place in the Track 2 Fidelity & Efficiency of NTIRE2024 Light Field Super Resolution Challenge and the seventh place in the Track 1 Fidelity.
description: 10 pages, 5 figures
Analytical results for bond percolation and k-core sizes on clustered networks
Creators: name: Gleeson, James P.
name: Melnik, Sergey
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: An analytical approach to calculating bond percolation thresholds, sizes of $k$-cores, and sizes of giant connected components on structured random networks with non-zero clustering is presented. The networks are generated using a generalization of Trapman's [P. Trapman, Theor. Pop. Biol. {\bf 71}, 160 (2007)] model of cliques embedded in tree-like random graphs. The resulting networks have arbitrary degree distributions and tunable degree-dependent clustering. The effect of clustering on the bond percolation thresholds for networks of this type is examined and contrasted with some recent results in the literature. For very high levels of clustering the percolation threshold in these generalized Trapman networks is increased above the value it takes in a randomly-wired (unclustered) network of the same degree distribution. In assortative scale-free networks, where the variance of the degree distribution is infinite, this clustering effect can lead to a non-zero percolation (epidemic) threshold.
description: Revised version, to appear in Phys. Rev. E
A cytotaxonomic study of the most common larval Chironomidae in a series of saline waters in the southern interior of British Columbia
Creators: name: Bassett, Michael Conway
Publisher: name: University of British Columbia
Year: 2011

description: A preliminary cytotaxonomic study of the common Chironomidae in a series of saline waters in the southern interior of British Columbia has been undertaken. The banding pattern of the salivary gland chromosomes, once it had been described, was used as a taxonomic criterion and as an indicator of the relationships between the groups involved. In order to obtain associated stages in the life cycle, the larvae were reared in individual vials. The polytene chromosome analysis revealed seven well defined larval species. The subsequent morphological analysis showed that five of these larval species could usually be separated by their external morphology. However, two cytologically distinct species are morphologically indistinguishable. Recent work on sibling species in Drosophila and Chironomus (Diptera) has shown that sibling species have salivary gland chromosomes with an identical banding pattern but, differ from one another in the frequency of inversions. The present study suggests that the morphologically identical larvae mentioned above are sibling species in larval morphology but are clearly separable by chromosome analysis. The fact that they occur together in the same lake tends to eliminate the view that they are distinct populations of a single species. That there may be more than one species involved in those here considered to be a single taxa, should however not be forgotten.
Fifty years of state secondary education in Tasmania, 1913 to 1962. A study of educational developments.
Creators: name: Johnston, GL
Publisher: name: University Of Tasmania
Year: 2023

description: The first State High schools were established at Hobart and Launceston in 1913. Since then, no comprehensive description of the diverse developments in Tasmanian State secondary education has been undertaken. What follows is an attempt to describe and intrepret the growth of this system in the first fifty years of its operation.The thesis has been divided into three parts. The first deals with the establishment of the State high and junior technical schools and covers roughly the first twenty years of this century. By 1920 the system of State secondary education which was to remain relatively unchanged for the next twenty years had been set up. The treatment of this period constitutes Part II. The final section, Part III, begins with the proposal made in 1942 to raise the school leaving age to sixteen.
title: Use of synthetic mRNA transfection encoding telomerase to improve the in-vitro lifespan of dental pulp stem cells
Creators: name: Kinteh, Fatoumata
Publisher: name: University of Glasgow
Year: 2025
Subjects: subject: DPSCs, synthetic mRNA, telomeres, telomerase, q-PCR.

description: Dental pulp stem cells (DPSCs), like most stem cells, have the potential to be used in regenerative medicine. However, one of the limitations to the usage of DPSCs is their inability to maintain a long term, in-vitro lifespan due to replicative senescence. A key contributing factor to this senescence is telomere erosion.

Our research aimed to generate and use a synthetic messenger RNA (mRNA) encoding the human telomerase, a key protein responsible for telomere maintenance. mRNA was chosen instead of reprogramming cells using DNA constructs as the latter carries the risk of unwanted genomic integrations. Successes with the highly effective COVID-19 vaccines and other RNA drugs, such as small interfering RNA (siRNA) drugs, has driven substantial improvements in RNA delivery technologies and greatly increased the potential of mRNA approaches.

After correcting a mutation found in the telomerase mRNA sequence, we synthesised telomerase mRNA from the corrected plasmid using CleanCapAGTM to add cap1 structure to the 5’ end, substituting the normal uridine triphosphate (UTP) with the N1-methylpseudouridine triphosphate and polyadenylating the final product. We used eGFP-encoding mRNA made the same way as a transfection control. We showed that both DPSCs and a control cancer cell line, TR146, could be transfected with enhanced green fluorescent protein (eGFP) mRNA at high efficiency with a simple procedure and an inexpensive commercially available RNA transfection reagent.

Telomere lengths (TL) in DPSCs (both wild type and transfected) were quantified as a relative measurement using the quantitative polymerase chain reaction (qPCR) method originally designed by Richard Cawthon and later modified by O’Callaghan and Fenech. We found that, indeed, telomere erosion occurs in DPSCs as the cells age by increasing passage numbers. However, DPSCs with shorter telomere lengths transfected with the telomerase mRNA showed no sign of telomere extension.

In contrast, TR146 cancer cells which had shorter telomeres than DPSCs had their telomeres significantly extended after transfection with the same synthetic telomerase mRNA indicating the mRNA was functional. It is possible that the synthetic telomerase mRNA is not translated in DPSCs, and Western blot evaluation is needed to test this. Initial experiments suggested other genes required for telomere extension were transcribed in DPSCs. However further works is also needed to test if these are expressed strongly enough.
Fluctuation-Induced Interaction between Randomly Charged Dielectrics
Creators: name: Naji, Ali
name: Dean, David S.
name: Sarabadani, Jalal
name: Horgan, Ron R.
name: Podgornik, Rudolf
Publisher: name: arXiv
Year: 2009
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Monopolar charge disorder effects are studied in the context of fluctuation-induced interactions between neutral dielectric slabs. It is shown that quenched bulk charge disorder gives rise to an additive contribution to the net interaction force which decays as the inverse distance between the slabs and may thus completely mask the standard Casimir--van der Waals force at large separations. By contrast, annealed (bulk or surface) charge disorder leads to a net interaction force whose large-distance behavior coincides with the universal Casimir force between perfect conductors, which scales as inverse cubic distance, and the dielectric properties enter only in subleading corrections.
description: 4 pages, 2 figures
Spatial organization of connectivity in functional climate networks describing event synchrony of heavy precipitation
Creators: name: Wolf, Frederik
name: Donner, Reik V.
Publisher: name: Berlin ; Heidelberg : Springer
Year: 2021
Subjects: subject: Southeastern South-America
subject: Node-Weighted Measures
subject: Level Jet East
subject: Complex Networks
subject: Small-World
subject: Extreme Precipitation
subject: Earthquake Networks
subject: Recurrence Networks
subject: Scale-Free
subject: Rainfall
subject: 530

description: In the past years, there has been an increasing number of applications of functional climate networks to studying the spatio-temporal organization of heavy rainfall events or similar types of extreme behavior in some climate variable of interest. Nearly all existing studies have employed the concept of event synchronization (ES) to statistically measure similarity in the timing of events at different grid points. Recently, it has been pointed out that this measure can however lead to biases in the presence of events that are heavily clustered in time. Here, we present an analysis of the effects of event declustering on the resulting functional climate network properties describing spatio-temporal patterns of heavy rainfall events during the South American monsoon season based on ES and a conceptually similar method, event coincidence analysis (ECA). As examples for widely employed local (per-node) network characteristics of different type, we study the degree, local clustering coefficient and average link distance patterns, as well as their mutual interdependency, for three different values of the link density. Our results demonstrate that the link density can markedly affect the resulting spatial patterns. Specifically, we find the qualitative inversion of the degree pattern with rising link density in one of the studied settings. To our best knowledge, such crossover behavior has not been described before in event synchrony based networks. In addition, declustering relieves differences between ES and ECA based network properties in some measures while not in others. This underlines the need for a careful choice of the methodological settings in functional climate network studies of extreme events and associated interpretation of the obtained results, especially when higher-order network properties are considered.
Heating and cooling of magnetars with accreted envelopes
Creators: name: Kaminker, A. D.
name: Potekhin, A. Y.
name: Yakovlev, D. G.
name: Chabrier, G.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We study the thermal structure and evolution of magnetars as cooling neutron stars with a phenomenological heat source in an internal layer. We focus on the effect of magnetized (B > 10^{14} G) non-accreted and accreted outermost envelopes composed of different elements, from iron to hydrogen or helium. We discuss a combined effect of thermal conduction and neutrino emission in the outer neutron star crust and calculate the cooling of magnetars with a dipole magnetic field for various locations of the heat layer, heat rates and magnetic field strengths. Combined effects of strong magnetic fields and light-element composition simplify the interpretation of magnetars in our model: these effects allow one to interpret observations assuming less extreme (therefore, more realistic) heating. Massive magnetars, with fast neutrino cooling in their cores, can have higher thermal surface luminosity.
description: 13 pages, 10 figures, 5 tables, accepted for publication in MNRAS
The Story of Maa Annapūrṇa: Eco-Sustainability the Vedic way
Creators: name: Rhituparna Chakraborty
Publisher: name: Zenodo
Year: 2021

description: Vedic knowledge from ancient Indian Sanskrit literary texts place reverence towards nature, ecology, and organic farming, as seen in the story of Maa Annapūrṇa the goddess of food; and a return to food-production calculations based on Vedic knowledge, that has been discredited over the years by colonial and western interventions as displayed via Rajiv Malhotra’s research, can increase the yield of food-production while maintaining the ecological balance of the earth, as seen in the organic farming projects in North and Central India undertaken by Vandana Shiva’s foundational organization Navdanya from the past three and a half decades.
Design emergence: Beyond modernist orthodoxies in colour/form painting
Creators: name: Kaukenas, O
Publisher: name: University Of Tasmania
Year: 2023

description: Through this research project I explore the operations of formalist abstraction, its visual aesthetic and its potential for communicating content and meaning for the viewer. Using the device of colour/form painting on shaped MDF board, 1 investigate the functional dynamic that exists between myself as artist and the work which I produce. Working with a geometric form, which lrefer to as the base module, I engage in a process of design emergence which utilizes both my intuitive and cognitive faculties. This process involves a mass production of the base module, followed by the configuration of the resu lting components into a number of design assemblages. As I work with the formal aesthetics of each configuration and its respective surface patterning, the visual properties of the base module change and emerge as a new design format. Working within the parameters of colour/form painting, I make reference to basic modernist orthodoxies such as flatness, materiality, the cumulative grid and pictorial immediacy. ln querying how each of these applies to my work, 1 succeed in circumventing their modernist prescriptions and attempt to show how they can function successfully in a postmodern conception of formalist abstraction. Basic to this inquiry is an assessment of Clement Greenberg's formalist aesthetic, especially in relation to the form/content debate and the subjectivity of aesthetic judgement. My references to the artists working in this field draw from those who pioneered colour/form painting in the modernist tradition, such as Ellsworth Kelly and Bridget Riley; those who took formalism into its conceptual stage, such as Sol LeWitt and Mel Bochner; and those who have used formalist, conceptual and theatrical elements to produce postmodern works for contemporary audiences, such as Sarah Morris and Matthew Ritchie. The two key factors operating throughout the design as emblages are firstly, the theories related to de ign emergence and, secondly, the theatrical mediation of work which, as formalist abstraction, I propose still maintains some aspects of modernist immediacy. Tbe design assemblages, when viewed seque ntia lly, il lustrate the phenomenon of design emergence. The gallery space, in relation to the shaped modules and their patterned surfaces, a llows for a 'mediated immediacy' that connects Fried's notion of the theau¬¨‚àëical with the self-referential quality of the formalist aesthetic.
Transit Probabilities for Stars With Stellar Inclination Constraints
Creators: name: Beatty, Thomas G.
name: Seager, Sara
Publisher: name: arXiv
Year: 2010
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The probability that an exoplanet transits its host star is high for planets in close orbits, but drops off rapidly for increasing semimajor axes. This makes transit surveys for planets with large semimajor axes orbiting bright stars impractical, since one would need to continuously observe hundreds of stars that are spread out over the entire sky. One way to make such a survey tractable is to constrain the inclination of the stellar rotation axes in advance, and thereby enhance the transit probabilities. We derive transit probabilities for stars with stellar inclination constraints, considering a reasonable range of planetary system inclinations. We find that stellar inclination constraints can improve the transit probability by almost an order of magnitude for habitable-zone planets. When applied to an ensemble of stars, such constraints dramatically lower the number of stars that need to be observed in a targeted transit survey. We also consider multiplanet systems where only one planet has an identified transit, and derive the transit probabilities for the second planet assuming a range of mutual planetary inclinations.
description: 10 pages, 7 figures, ApJ in press
Non-linear sigma models via the chiral de Rham complex
Creators: name: Ekstrand, Joel
name: Heluani, Reimundo
name: Kallen, Johan
name: Zabzine, Maxim
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Quantum Algebra (math.QA)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: We propose a physical interpretation of the chiral de Rham complex as a formal Hamiltonian quantization of the supersymmetric non-linear sigma model. We show that the chiral de Rham complex on a Calabi-Yau manifold carries all information about the classical dynamics of the sigma model. Physically, this provides an operator realization of the non-linear sigma model. Mathematically, the idea suggests the use of Hamiltonian flow equations within the vertex algebra formalism with the possibility to incorporate both left and right moving sectors within one mathematical framework.
description: 30 pages
Hydrodynamics of the CFL superfluid
Creators: name: Manuel, Cristina
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: At asymptotic high density and low temperature quarks form Cooper pairs in a color-flavor locked (CFL) configuration. The diquark condensates break spontaneously the baryon symmetry, and this fact makes the CFL phase also superfluid. At low temperatures the transport properties are dominated by the contribution of the superfluid phonon, the Goldstone boson associated to baryon symmetry breaking, in full analogy to what happens in superfluid He4. We discuss how to derive transport properties in the ultracold regime making use of an analogue model of gravity. We also review how this model can be used to study the scattering of phonons with quantized vortices in a rotating system. Finally, we consider the implications of these results in studying the rotational properties of compact stars made of CFL quark matter
description: Talk given in the 8th Conference on Quark Confinement and the Hadron Spectrum, Mainz (Germany); 5 pages
Photophysical and Electrochemical Properties of Pyrimidopteridine‐Based Organic Photoredox Catalysts
Creators: name: Taeufer, Tobias
name: Argüello Cordero, Miguel A.
name: Petrosyan, Andranik
name: Surkus, Annette‐E.
name: Lochbrunner, Stefan
name: Pospech, Jola
Publisher: name: Weinheim : Wiley-VCH
Year: 2021
Subjects: subject: deoxygenation
subject: heteroarenes
subject: N-oxides
subject: organic photoredox catalysis
subject: pyrimidopteridines
subject: 540

description: Herein we describe the synthesis and photophysical and electrochemical characterization of pyrimidopteridine-based photoredox catalysts. The pyrimidopteridines can be obtained from the corresponding N-oxides through photo-mediated oxygen atom transfer to a sacrificial acceptor molecule on gramscale. The presence of a triplet excited state was evidenced by means of transient absorption spectroscopy. Pyrimidopteridines are potent excited state oxidants with excited state reduction potentials exceeding +2.10 V vs. SCE in MeCN. The catalytic activity is illustrated in the photo-mediated oxidative annulation of 2-phenylbenzoic acid.
Spin polarized states in neutron matter at a strong magnetic field
Creators: name: Isayev, A. A.
name: Yang, J.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Spin polarized states in neutron matter at a strong magnetic field are considered in the model with the Skyrme effective interaction (SLy4, SLy7 parametrizations). Analyzing the self-consistent equations at zero temperature, it is shown that a thermodynamically stable branch of solutions for the spin polarization parameter as a function of density corresponds to the negative spin polarization when the majority of neutron spins are oriented oppositely to the direction of the magnetic field. Besides, beginning from some threshold density being dependent on the magnetic field strength the self-consistent equations have also two other branches (upper and lower) of solutions for the spin polarization parameter with the positive spin polarization. The free energy corresponding to the upper branch turns out to be very close to the free energy corresponding to the thermodynamically preferable branch with the negative spin polarization. As a consequence, at a strong magnetic field, the state with the positive spin polarization can be realized as a metastable state at the high density region in neutron matter which under decreasing density at some threshold density changes into a thermodynamically stable state with the negative spin polarization. The calculations of the neutron spin polarization parameter and energy per neutron as functions of the magnetic field strength show that the influence of the magnetic field remains small at the field strengths up to $10^{17}$ G.
description: Prepared with RevTeX4, 8pp., 5 figs; v.2: matches published version
Speckle interferometry at the Blanco and SOAR telescopes in 2008 and 2009
Creators: name: Tokovinin, Andrei
name: Mason, Brian D.
name: Hartkopf, William I.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The results of speckle interferometric measurements of binary and multiple stars conducted in 2008 and 2009 at the Blanco and SOAR 4-m telescopes in Chile are presented. A total of 1898 measurements of 1189 resolved pairs or sub-systems and 394 observations of 285 un-resolved targets are listed. We resolved for the first time 48 new pairs, 21 of which are new sub-systems in close visual multiple stars. Typical internal measurement precision is 0.3 mas in both coordinates, typical companion detection capability is $Δm \sim 4.2$ at 0\farcs15 separation. These data were obtained with a new electron-multiplication CCD camera; data processing is described in detail, including estimation of magnitude difference, observational errors, detection limits, and analysis of artifacts. We comment on some newly discovered pairs and objects of special interest.
description: Accepted for publication in Astronomical Journal. Tables 4,5,7 will be published electronically, they are available in full from the authors
A study in railway economics : with special reference to the government railways of Tasmania
Creators: name: Hytten, Torleiv
Publisher: name: University Of Tasmania
Year: 2023

description: 1. This thesis has been undertaken as a first attempt to an analysis of the economics of railway transport in Australia. The first intention was merely a study of the revenue and expenditure of the Tasmanian Government Railways, but in order to get the necessary perspective, it was essential to study the methods of other Australian railway sustems as well. This part of the work is contained in the first nine sections of the thesis, which also includes the geographic and historical settings of the problem. 2. In the processs of gathering the material for this part of the work a lot of interesting material was met with concerning the capital position of both the Tasmanian and other Australian railway systems and some of the other problems facing Australian railways. It happened fortunately that while the thesis was being written the Royal Commission enquiring into the position of the Victorian Railways was sitting, and a lot of material, much of which will soon be buried in the back files of Melbourne newspapers, became available. For this reason the last four sections were added to the thesis, which therefore naturally falls into two parts. Since the completion of the work the Victorian Commission has issued its report, and as the evidence before the Commission has been referred to in several places, an appendix (No. XIV) has been added dealing briefly with some of the relevant findings of the Commission. The Mechanical Transport Sub- Committee of the Development and Migration Commission is at present investigating the position of the Tasmanian Railways, but has so far published no report, and has not taken evidence in public.
Line profiles in a neon glow plasma
Creators: name: Stansfield, Barry Lionel
Publisher: name: University of British Columbia
Year: 2011

description: A new experimental technique has been developed for the determination of absorption line profiles in steady-state plasmas. The method involves observing the total transmitted line intensity of one component of the longitudinal Zeeman pattern from a background source. The frequency shift of this line is determined from the known magnetic field and the Landé g-factors involved. The light from the background source is amplitude modulated by a chopping wheel, and the intensity of the transmitted light is measured with a phase-sensitive detector.
Ambient Hydrogenation and Deuteration of Alkenes Using a Nanostructured Ni-Core-Shell Catalyst
Creators: name: Gao, Jie
name: Ma, Rui
name: Feng, Lu
name: Liu, Yuefeng
name: Jackstell, Ralf
name: Jagadeesh, Rajenahally V.
name: Beller, Matthias
Publisher: name: Weinheim : Wiley-VCH
Year: 2021
Subjects: subject: alkenes
subject: catalysis
subject: deuteration
subject: hydrogenation
subject: nanoparticles
subject: 540

description: A general protocol for the selective hydrogenation and deuteration of a variety of alkenes is presented. Key to success for these reactions is the use of a specific nickel-graphitic shell-based core–shell-structured catalyst, which is conveniently prepared by impregnation and subsequent calcination of nickel nitrate on carbon at 450 °C under argon. Applying this nanostructured catalyst, both terminal and internal alkenes, which are of industrial and commercial importance, were selectively hydrogenated and deuterated at ambient conditions (room temperature, using 1 bar hydrogen or 1 bar deuterium), giving access to the corresponding alkanes and deuterium-labeled alkanes in good to excellent yields. The synthetic utility and practicability of this Ni-based hydrogenation protocol is demonstrated by gram-scale reactions as well as efficient catalyst recycling experiments. © 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH
New constraints on a light CP-odd Higgs boson and related NMSSM Ideal Higgs Scenarios
Creators: name: Dermisek, Radovan
name: Gunion, John F.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Recent BaBar limits on $\br(Υ(3S)\to \gam a\to \gam τ^+τ^-)$ and $\br(Υ(3S)\to \gam a\to \gam μ^+μ^-)$ provide increased constraints on the $a b\anti b$ coupling of a CP-odd Higgs boson, $a$, with $m_a7.5\gev$ scenarios, which are theoretically the most favored, survive. We also outline the impact of the new ALEPH LEP results in the $\epem\to Z+4τ$ channel. For $\tanβ\geq 3$, only NMSSM ideal Higgs scenarios with $m_{h_1}\gsim 98\gev$ and $m_{a_1}$ close to $2m_B $ satisfy the ALEPH limits. For $\tanβ\lsim 2$, the ALEPH limits are easily satisfied for the most theoretically preferred NMSSM scenarios, which are those with $m_{a_1}$ close to $2m_B$ and $m_{h_1}\sim 90\gev-100\gev$.
description: 24 pages, 25 figures, paper updated to incorporate final ALEPH limits in Z+4\tau channel.
Utilization of manpower at children's aid society of Vancouver, B.C.
Creators: name: Adams, Robert L.
Publisher: name: University of British Columbia
Year: 2011

description: This study was prompted by a staff-shortage crisis in Social Work. Because it is apparent that this manpower crisis cannot be alleviated by an increase in professional recruitment, methods must be found by which to utilize effectively persons without professional standing. Our assumptions in this study, therefore, are firstly, that tasks presently performed by professionally-trained social workers can be categorized according to specific criteria and secondly, that these tasks can then be assigned to various levels of staff, both professional and non-professional. This study deals with the former assumption, the latter assumption will be left to further research. The agency from which our study was drawn was the Children's Aid Society of Vancouver, B.C. The specific area of study in the agency was Services to Children-in-Care. As criteria for differentiating tasks we chose "worker autonomy" and "task complexity". In essence these are, respectively, the functioning of the worker in relation to his internalized professional standards, and the relative amount of activity inherent in a task. We then devised a list of tasks which we presented to a random sample of line workers, with the major aim of determining whether or not the tasks were actually performed. The list of tasks was revised on suggestions from the respondents and presented a second time. This indicated the representative nature of the tasks. In order to rate each task as to its degree of complexity and the degree of autonomy required by a worker to perform it, we selected twelve judges at random six from Children's Aid Society Staff and six from a list supplied by the British Columbia Association of Social Workers. The judges rated each task on a five-point scale for each of our two criteria. In analyzing the data we were concerned primarily with the degree of agreement among the judges as to their ratings of each task on the two criteria of "worker autonomy" and "task complexity". Our findings showed a high percentage of agreement among judges on both criteria for most tasks. This indicates that the majority of tasks can be differentiated. The findings also showed a high degree of relationship between "worker autonomy" and "task complexity" -- that is, if a task was judged highly autonomous it was usually also judged highly complex. This points to the possible redundancy of the second criterion, "task complexity". In other words, it appears that "worker autonomy" may be the important measuring instrument by which tasks can be differentiated in order to be assigned to personnel of differing competence.
Continuity of the integrated density of states on random length metric graphs
Creators: name: Lenz, Daniel
name: Peyerimhoff, Norbert
name: Post, Olaf
name: Veselic', Ivan
Publisher: name: arXiv
Year: 2008
Subjects: subject: Spectral Theory (math.SP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We establish several properties of the integrated density of states for random quantum graphs: Under appropriate ergodicity and amenability assumptions, the integrated density of states can be defined using an exhaustion procedure by compact subgraphs. A trace per unit volume formula holds, similarly as in the Euclidean case. Our setting includes periodic graphs. For a model where the edge length are random and vary independently in a smooth way we prove a Wegner estimate and related regularity results for the integrated density of states. These results are illustrated for an example based on the Kagome lattice. In the periodic case we characterise all compactly supported eigenfunctions and calculate the position and size of discontinuities of the integrated density of states.
description: 31 pages, 2 figures; introduction extended, references updated
TISH KARIESINING KENG TARQALISHIGA SABAB BO'LUVCHI OMILLAR
Creators: name: Axmedova, Malika
Publisher: name: Zenodo
Year: 2023

description: Ushbu keng qamrovli maqola zamonaviy jamiyatdagi stomatologik karies va ijtimoiy-madaniy omillar o'rtasidagi ko'p qirrali munosabatlarni o'rganadi. Tish kariesi global sog'liq uchun keng tarqalgan muammo bo'lib qolayotgan bir paytda, ushbu tadqiqot ijtimoiy-madaniy determinantlarning etiologiyasi, tarqalishi va potentsial kamaytirish strategiyalaridagi rolini chuqur tahlil qilishni taklif qiladi
Disorder-induced coupling of Weyl nodes in WTe2
Creators: name: Sykora, Steffen
name: Schoop, Johannes
name: Graf, Lukas
name: Shipunov, Grigory
name: Morozov, Igor V.
name: Aswartham, Saicharan
name: Büchner, Bernd
name: Hess, Christian
name: Giraud, Romain
name: Dufouleur, Joseph
Publisher: name: My University
Year: 2020
Subjects: subject: Quantum transport
subject: Symmetry protected topological states
subject: Topological phases of matter
subject: Topological materials
subject: 530

description: The finite coupling between Weyl nodes due to residual disorder is investigated by magnetotransport studies in WTe2. The anisotropic scattering of quasiparticles is evidenced from classical and quantum transport measurements. A theoretical approach using the real band structure is developed in order to calculate the dependence of the scattering anisotropy with the correlation length of the disorder. A comparison between theory and experiments reveals a short correlation length in WTe2 (ξ∼5 nm). This result implies a significant coupling between Weyl nodes and other bands. Our study thus shows that a finite intercone scattering rate always exists in weakly disordered type-II Weyl semimetals, such as WTe2, which strongly suppresses topologically nontrivial properties.
Model of ionic currents through microtubule nanopores and the lumen
Creators: name: Freedman, Holly
name: Rezania, Vahid
name: Priel, Avner
name: Carpenter, Eric
name: Noskovd, Sergei Y.
name: Tuszynski, Jack A.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Subcellular Processes (q-bio.SC)
subject: Biological Physics (physics.bio-ph)
subject: Biomolecules (q-bio.BM)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: It has been suggested that microtubules and other cytoskeletal filaments may act as electrical transmission lines. An electrical circuit model of the microtubule is constructed incorporating features of its cylindrical structure with nanopores in its walls. This model is used to study how ionic conductance along the lumen is affected by flux through the nanopores when an external potential is applied across its two ends. Based on the results of Brownian dynamics simulations, the nanopores were found to have asymmetric inner and outer conductances, manifested as nonlinear IV curves. Our simulations indicate that a combination of this asymmetry and an internal voltage source arising from the motion of the C-terminal tails causes a net current to be pumped across the microtubule wall and propagate down the microtubule through the lumen. This effect is demonstrated to enhance and add directly to the longitudinal current through the lumen resulting from an external voltage source, and could be significant in amplifying low-intensity endogenous currents within the cellular environment or as a nano-bioelectronic device.
description: 43 pages, 6 figures, revised version
Characterization of Sr-containing MBGs grafted with ICOS-Fc
Creators: name: Vitale, Chiara
Publisher: name: Zenodo
Year: 2020

description: The goal of the investigation is the morphological and structural characterization of strontium containing MBGs produced using a spray-drying method and successively grafted with ICOS-Fc. Grafting of ICOS-Fc on MBG surface was achieved following a covalent zero-distance approach. At first, strontium containing MBGs were functionalized to obtain amino groups exposed on the surface and successively, ICOS-Fc was grafted exploiting the carboxyl groups of Fc residue.
Reflection equation for the N=3 Cremmer-Gervais R-matrix
Creators: name: Motegi, Kohei
name: Yamada, Yuji
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We consider the reflection equation of the N=3 Cremmer-Gervais R-matrix. The reflection equation is shown to be equivalent to 38 equations which do not depend on the parameter of the R-matrix, q. Solving those 38 equations. the solution space is found to be the union of two types of spaces, each of which is parametrized by the algebraic variety $\mathbb{P}^1(\mathbb{C}) \times \mathbb{P}^1(\mathbb{C}) \times \mathbb{P}^2(\mathbb{C})$ and $ \mathbb{C} \times \mathbb{P}^1(\mathbb{C}) \times \mathbb{P}^2(\mathbb{C})$.
description: 28 pages, revised version