cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Labor Market Institutions and Informality in Transition and Latin American Countries
Creators: name: Lehmann, Hartmut
name: Muravyev, Alexander
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/02 Politica economica

description: This paper analyzes, using country-level panel data from transition economies and Latin America, the impact of labor market institutions on informal economic activity. The measure of informal economic activity is taken from Schneider et al. (2010), the most comprehensive study to date. The data on institutions, which cover employment protection legislation (EPL), the tax wedge, the unemployment benefit level, unemployment benefit duration and union density, are assembled at the IZA (transition countries) and the World Bank (LAC countries). We find that a more regulated labor market (higher EPL) increases the size of the informal economy. There is also evidence that a larger tax wedge increases informality. The tax wedge elasticity of informal economy, when evaluated at the sample mean, is rather modest, around 0.1%. Our results are broadly in line with the literature, which identifies labor market regulation and the tax wedge as important drivers of informality.
Household Inflation Expectations: Information Gathering, Inattentive or ‘Stubborn’?
Creators: name: Easaw, Joshy
name: Golinelli, Roberto
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/05 Econometria

description: The purpose of this paper is to investigate the microfoundations of how non-experts’ (or general public) form inflation expectations. Using a unique dataset we investigate the range of near rational inflation expectations. An important contribution to understanding how non-experts form their expectations is ‘sticky information expectations’, specifically the epidemiological model. Our analysis uses an extended version of the epidemiological model. We find that the general public are best depicted as those who are either information gathers or inattentive. In addition, the inattentive general public can be either forward-looking or ‘stubborn’, that is persistent.
Acoustic phonons mediated non-equilibrium spin current in the presence of Rashba and Dresselhaus spin-orbit couplings
Creators: name: Hasanirokh, K.
name: Phirouznia, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: The influence of the electrons interaction with longitudinal acoustic phonons on magnetoeletric and spin-related transport effects are investigated. The physical system under consideration has been assumed to be a two dimensional electron gas system with both Rashba and Dreesselhaus spin-orbit couplings. In the works which have been previously performed in this field it has been shown that in the non-equilibrium regime, the Rashba and Dreesselhaus couplings can not be responsible for spin-current where in the absence of other interactions such as lattice vibrations identically vanishes. In the current work we have employed a semi-classical method by using the Boltzmann approach. It was shown that the spin-current of the system, in general, does not go all the way to zero at any value of the spin-orbit couplings. It was also shown that the spin accumulation of the system can be influenced by the electron-phonon coupling.
From Communal to State Finance: a New Fiscal Pact in the Early Modern Papal States
Creators: name: Carboni, Mauro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/12 Storia economica

description: State building and state competition during the 16th century triggered a creative moment in the history of public finance. Recent scholarship has clearly identified the Papal States and their communities as active participants both in the state building process and the reorganization of public finance. Banking on a wealth of fiscal records, it is argued that Papal authority succeeded in forging a new fiscal pact – which lasted over two centuries - between central and local authorities. Blending conservatism and innovation the papacy promoted a contractual approach: local powers were granted a large degree of autonomy in selecting fiscal instruments, the types of wealth to be taxed and the means of collecting resources, while the Apostolic Chamber secured both the control of a growing portion of the provinces’ fiscal income as well as access to a pool of financial resources at a rapidly declining cost.
Robust Adaptive Spacecraft Array Derivative Analysis
Creators: name: Vogt, J.
name: Blagau, A.
name: Pick, L.
Publisher: name: FID GEO
Year: 2020

description: Multispacecraft missions such as Cluster, Themis, Swarm, and MMS contribute to the exploration of geospace with their capability to produce gradient and curl estimates from sets of spatially distributed in situ measurements. This paper combines all existing estimators of the reciprocal vector family for spatial derivatives and their errors. The resulting framework proves to be robust and adaptive in the sense that it works reliably for arrays with arbitrary numbers of spacecraft and possibly degenerate geometries. The analysis procedure is illustrated using synthetic data as well as magnetic measurements from the Cluster and Swarm missions. An implementation of the core algorithm in Python is shown to be compact and computationally efficient so that it can be easily integrated in the various free and open source packages for the Space Physics and Heliophysics community.
Powering Ghana's Green Future: Exploring Clean Energy Paths
Creators: name: Yeboah, Daniel Boateng
name: Amoah, Mark
name: Sabasi, Shelton
name: Twum Ofosua Angela
name: Evans Armah Kwame
Publisher: name: Zenodo
Year: 2023
Subjects: Climate Change, NDC, Emissions, nuclear, Renewable Energy, Clean Energy

description: A presentation on the Powering Ghana's Green Future: Exploring Clean Energy Paths. Presented by the Ghana Team
Modelling alternative pathways for decarbonization of the power supply system in Ghana using OSeMOSYS
Creators: name: Yeboah, Daniel Boateng
name: Amoah, Mark
name: Sabasi, Shelton
name: Twum Ofosua Angela
name: Evans Armah Kwame
Publisher: name: Zenodo
Year: 2023
Subjects: Climate Change

description: A presentation on the Modelling alternative pathways for decarbonization of the power supply system in Ghana. Presented by the Ghana Team
A maximum principle in spectral optimization problems for elliptic operators subject to mass density perturbations
Creators: name: Lamberti, Pier Domenico
name: Provenzano, Luigi
Publisher: name: arXiv
Year: 2012
Subjects: subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 35J40, 35B20, 35P15

description: We consider eigenvalue problems for general elliptic operators of arbitrary order subject to homogeneous boundary conditions on open subsets of the euclidean N-dimensional space. We prove stability results for the dependence of the eigenvalues upon variation of the mass density and we prove a maximum principle for extremum problems related to mass density perturbations which preserve the total mass.
The Role of Job Satisfaction in Transitions into Self-Employment
Creators: name: Guerra, Giuliano
name: Patuelli, Roberto
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/02 Politica economica

description: As observed in many advanced economies experiencing an increase of self-employment rates since the late 1970s, a flourishing small- and medium-size enterprise sector is traditionally associated with positive economic development and growth. In the regional context, areas benefiting from an established entrepreneurial culture are in general more successful and innovative, as well as better equipped to sustain structural changes and to lessen unemployment. It is therefore important to investigate the reasons why individuals choose self-employment, and why they do it despite lower protection, higher risks, and possibly more effort than what is required in a comparable wage employment position. Existing research identifies better prospects of entrepreneurial earnings as compared to wages as a major stimulus towards selfemployment.
However, besides pecuniary motivations, other factors may be considered when it comes to the occupational choice. These include displacement, uncertainty, (the threat of) unemployment, and (dis)satisfaction. Building on a job quits model, we propose a representation of transition behaviour from wage to self-employment which includes subjective evaluations of pecuniary and nonpecuniary satisfaction on the previous job. Individual microdata are drawn from the Swiss Household Panel (SHP), and cover the time period 1999–2008. Additionally, we focus on the dynamics of job satisfaction in order to highlight the role played by shocks in subjective evaluations, and introduce their interaction with levels to control for threshold effects.
Self investments of adolescents and their cognitive development
Creators: name: Del Boca, Daniela
name: Monfardini, Chiara
name: Nicoletti, Cheti
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/05 Econometria

description: While a large literature has focused on the impact of parental investments on child cognitive development, very little is known about the role of child's own investments. Information on how children invest their time separately from parents is probably little informative for babies and toddlers, but it becomes more and more important in later stages of life, such as adolescence, when children start to take decisions independently. By using the Child Development Supplement of the PSID (Panel Study of Income Dynamics), we model the production of cognitive ability of adolescents and extend the set of inputs to include the child's own time investments. Looking at investments during adolescence, we find that child's investments matter more than mother's investments. On the contrary, looking at investments during childhood, it is the mother's investments that are more important. Our results are obtained accounting for potential unobserved child's and family's endowments and are robust across several specifications and samples, e.g. considering and not considering father's investments and non-intact families.
Powering Ghana's Green Future: Exploring Clean Energy Paths
Creators: name: Yeboah, Daniel Boateng
name: Amoah, Mark
name: Sabasi, Shelton
name: Twum Ofosua Angela
name: Evans Armah Kwame
Publisher: name: Zenodo
Year: 2023
Subjects: Climate Change

description: A presentation on the Powering Ghana's Green Future: Exploring Clean Energy Paths. Presented by the Ghana Team
First Detection of HC5N Within A Protoplanetary Disk
Creators: name: Wampler, S. Cole
name: Loomis, Ryan A.
Publisher: name: Zenodo
Year: 2023

description: Since ALMA's first light in 2011, the molecular inventory of protoplanetary disks has dramatically increased, to including the detection of complex organic molecules (COMs) such as CH3CN, HCOOH, and HC3N. These COMs not only present an opportunity to investigate the prebiotic chemistry of forming planetary systems, but they also act as valuable physical tracers of fundamental disk properties. Continuing to expand this molecular inventory to more complex species both allows for refinement of chemical models and adds new tracers of disk physics to our toolbox.Here we present the first detection of HC5N toward the nearest protoplanetary disk TW Hya; the largest species detected thus far in disks. With such a high molecular mass, HC5N has very little thermal broadening. This combined with its low optical depth provides a chance to probe turbulence within the planet and comet forming midplanes of protoplanetary disks. We discuss these possibilities within the context of the increased sensitivity and spectral resolution of ALMA's upcoming Wideband Sensitivity Upgrade and the ngVLA.
Macroscopic pair correlation of the Riemann zeroes for smooth test functions
Creators: name: Rodgers, Brad
Publisher: name: arXiv
Year: 2012
Subjects: subject: Number Theory (math.NT)
subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 11M26

description: On the assumption of the Riemann hypothesis, we show that over a class of sufficiently smooth test functions, a measure conjectured by Bogomolny and Keating coincides to a very small error with the actual pair correlation measure for zeroes of the Riemann zeta function. Our result extends the well known result of Montgomery that over the same class of test functions the pair correlation measure coincides (to a larger error term) with that of the Gaussian Unitary Ensemble (GUE). The restriction of test functions remains stringent, but we are nonetheless able to detect, at a microscopically blurred resolution, macroscopic troughs in the pair correlation measure.
description: 19 pages, 1 figure. Incorporates referee suggestions
Pressures at the front lines : investigative sites and contract research organizations in Canadian clinical trials
Creators: name: Preto, Christina Louise
Publisher: name: University of British Columbia
Year: 2014

description: Commercialization of medical research, and clinical trials in particular, has been the subject of scrutiny by policy makers and academics. However, little attention has focused on a more recent but now dominant actor: the contract research organization (CRO). Over the past twenty-five years, CROs have assumed much of academia’s role in the conduct and control of clinical trials, and are now the de facto face of industry sponsors for those working at investigative sites. This dissertation examines sites, their relationship with CROs, and the extent to which Canadians are protected by Canada’s clinical trials oversight framework. This dissertation includes both empirical and normative components. First, and based on an extensive review of industry and academic literature, I describe the lay of the land of clinical trials in Canada and set the regulatory and economic context. Second, a qualitative interview study explores the relatively unexamined interface between site and CRO to identify key areas of concern from the perspective of those working at the frontlines of Canadian clinical trials. This is based on 24 semi-structured interviews. Participants were recruited so as to provide a range of perspectives relevant to the practice realities at the frontlines and the challenges that arise in relation to site-CRO interactions. It includes participants working at sites, CROs, pharmaceutical companies and in consultancy roles with clients across these categories. Third, a critical legal and ethical analysis of the regulatory and policy frameworks governing clinical trials in Canada is undertaken to determine areas of weakness in light of the issues identified in the qualitative study. A number of shortcomings with Canada’s approach to clinical trial oversight in relation to both investigator and industry-initiated trials are identified. Key among these is an overreliance on sponsors for trial oversight, which raises different concerns in industry and investigator-initiated trials. These and other critical issues are explored and recommendations to address such concerns are made. This study supports the growing call for an evidence based approach to protecting human subjects in research and is particularly timely given the intense efforts currently underway to attract more industry funded clinical trials to Canada.
The Entropy of an Overlapping Dynamical System
Creators: name: Barnsley, Michael F.
name: Harding, Brendan
name: Vince, Andrew
Publisher: name: arXiv
Year: 2011
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37B40, 37E05, 28A80

description: The term "overlapping" refers to a certain fairly simple type of piecewise continuous function from the unit interval to itself and also to a fairly simple type of iterated function system (IFS) on the unit interval. A correspondence between these two classes of objects is used (1) to find a necessary and sufficient condition for a fractal transformation from the attractor of one overlapping IFS to the attractor of another overlapping IFS to be a homeomorphism and (2) to find a formula for the topological entropy of the dynamical system associated with an overlapping function.
description: Includes correction to Lemma 6.2
On the Emergence of Overcompliance with Endogenous Environmental Standards and Patronising Consumers
Creators: name: Lambertini, Luca
name: Tampieri, Alessandro
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/01 Economia politica

description: We propose a model of environmental overcompliance in a duopoly setting where consumers are environmentally concerned and may patronise the product they buy, firms set their green investment to abate the impact of productivity on pollution and a government sets the environmental standard with the aim to maximise welfare. We show that, with no patronising consumers, overcompliance is unilateral by the firm with higher quality standard under Bertrand behaviour, whereas both firms may overcomply under Cournot competition if the environmental impact of production is sufficiently low. Conversely with patronising consumers, overcompliance is unilateral with low environmental impact of production under price competition, and both firm overcomply under quantity competition.
Additional file 1 of Online learning during COVID-19 produced equivalent or better student course performance as compared with pre-pandemic: empirical evidence from a school-wide comparative study
Creators: name: Zheng, Meixun
name: Bender, Daniel
name: Lyon, Cindy
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy

description: Additional file 1: Survey of online courses during COVID-19 pandemic.
Birth order and child outcomes: does maternal quality time matter?
Creators: name: Monfardini, Chiara
name: See, Sarah Grace
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2012
Subjects: SECS-P/05 Econometria

description: Higher birth order positions are often associated with poorer outcomes, possibly due to fewer resources received within the household. Using a sample of PSID-CDS children, we investigate whether the birth order effects in their outcomes are due to unequal allocation of the particular resource represented by maternal quality time. OLS regressions show that the negative birth order effects on various test scores are only slightly diminished when maternal time is included among the regressors. This result is confirmed when we account for unobserved heterogeneity at the household level, exploiting the presence of siblings in the data. Our evidence therefore suggests that birth order effects are not due to differences in maternal quality time received.
The Deepest View of the Molecular Gas in a Star-forming Galaxy at Cosmic Noon (z ~ 2)
Creators: name: Arriagada-Neira, Sebastián
name: Herrera-Camus, Rodrigo
name: Villanueva, Vicente
Publisher: name: Zenodo
Year: 2023

description: About 10 Gyr ago (z~2), typical or "main-sequence" star-forming galaxies were rich in molecular gas, feeding their star formation activity to all-time highs. I will present in the poster the latest results about the molecular gas properties of BX610, a normal, massive star-forming galaxy at z~2, for which we have obtained the most detailed map of the molecular gas based on very deep ALMA observations (~20 hr) of the CO(4-3) and [CI](1-0) transitions, and the dust continuum. This observation corresponds to the deepest integration on a single high-z source by ALMA so far, allowing us to study with a unique resolution the environmental properties of different regions of the galaxy. We also combine these observations with deep VLT/SINFONI Hα observations to obtain the complete picture of the molecular gas and star-formation properties. We observe that the excitation of the molecular gas decreases with galactocentric radius; while line ratios in the outskirts are consistent with those for MS galaxies at z~1, values in the central regions of BX610 are similar to those found in local starbursts. When comparing the star formation rates (SFR) derived from extinction-corrected Hα line emission and the 630 um ALMA dust continuum, we find that Hα is highly extinguished in the central region. Combining the SFR tracers, molecular gas, and stellar mass, we find that the molecular gas depletion time decreases in the central region, and the molecular gas fraction is high \((\sim 80\%)\) and remains almost constant with radius. Together, the ALMA and VLT observations presented here offer an unprecedented view of star formation activity and the molecular gas properties of a high redshift galaxy.
Network of filamentary structures and cluster formation in Corona Australis revealed with ALMA
Creators: name: Tachihara, Kengo
Publisher: name: Zenodo
Year: 2023

description: Contrary to the understanding of isolated star formation, the initial condition of cluster formation remains poorly understood. In this study, we investigated the head region of the Corona Australis molecular cloud, which is the closest low-mass cluster-forming region. The cloud has a distinctive head-tail shape with elongated structures spanning approximately 5 pc, originating from a dense gas clump of around 400 solar masses. Our analysis utilized ALMA ACA data in the C18O (J=2-1) emission line, reveal complex internal structures. Applying the FilFinder algorithm, we identified a network of 91 thin filamentary structures with an average width of 0.007 pc within the observed region of approximately 0.4 pc^2. The derived line mass of these filaments ranges from 0.7 to 7 solar M_o/pc, based on the column density measurements of 0.5 to 5 x 10^22 cm^-2. Notably, these values are found to be considerably smaller than the critical line mass. The typical linewidth of the filaments is ~ 1 km/s with inter-filament velocity dispersion of around 1 km/s, indicating a turbulent condition suggestive of external disturbance. Interestingly, out of the 91 identified filamentary structures, only 10 are associated with young stellar objects (YSOs), despite the presence of 50 YSOs within the cluster. This finding suggests that most of the filamentary structures are transient and do not undergo fragmentation to form stars via gravitational instability. Recent high-resolution numerical magnetohydrodynamic (MHD) simulations, incorporating filament formation by the flows along the magnetic field with ambipolar diffusion, successfully reproduced the observed cloud structure. As a result, these filamentary structures are interpreted as the result of slow shock instabilities. Additionally, this interpretation is supported by the fact that the cloud is situated at the boundary of two HI shells.
Muon Collider
Creators: name: Holmes, Stephen D.
name: Shiltsev, Vladimir D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: Both e+e- and μ+μ- colliders have been proposed as possible candidates for a lepton collider to complement and extend the reach of the Large Hadron Collider (LHC) at CERN. The physics program that could be pursued by a new lepton collider (e+e- or μ+μ-) with sufficient luminosity would include understanding the mechanism behind mass generation and electroweak symmetry breaking; searching for, and possibly discovering, supersymmetric particles; and hunting for signs of extra spacetime dimensions and quantum gravity. However, the appropriate energy reach for such a collider is currently unknown, and will only be determined following initial physics results at the LHC. It is entirely possible that such results will indicate that a lepton collider with a collision energy well in excess of 1 TeV will be required to illuminate the physics uncovered at LHC. Such a requirement would require consideration of muons as the lepton of choice for such a collider.
description: v.2., 6 pp. To appear in the 2nd edition of the book Elementary Particles, Landolt-Boernstein Series published by Springer. arXiv admin note: text overlap with arXiv:physics/9901022 by other author
La valutazione del rischio da stress lavoro-correlato ai sensi dell'art. 28 del d.lgs. 81/2008
Creators: name: Peruzzi, Marco
Publisher: name: Università degli Studi di Urbino "Carlo Bo"
Year: 2011

description: L’obiettivo del saggio è quello di analizzare il quadro normativo che disciplina la prevenzione dello stress lavoro-correlato. Dopo una necessaria e preliminare introduzione al tema in una prospettiva pre-giuridica, ricostruita attraverso i rapporti Osha, l’autore cerca di esaminare l’interazione delle molteplici fonti regolative coinvolte, concentrandosi sulla definizione di stress lavoro-correlato ai sensi dell’art. 28 del d.lgs. 81/2008 nonché sugli strumenti di prevenzione. Particolare attenzione è riservata al modo in cui il tema in esame interagisce con il più ampio obbligo di valutare tutti i rischi nel luogo di lavoro, mobbing incluso.
The essay analyses the regulatory framework concerning the prevention of work-related stress. After a necessary preliminary overview of the topic from an interdisciplinary perspective, as provided by Osha reports, the author aims at examining the interaction of the multiple regulatory sources involved, focusing on the definition of work-related stress, as relevant to art. 28 of the delegated decree 81/2008, as well as on the instruments to prevent it. Particular attention is paid to the way the topic at hand interacts with the wider legal obligation to assess all risks arising in the workplace, mobbing included.
Parole chiave: rischi psico-sociali, stress lavoro-correlato, mobbing, violenza sul luogo di lavoro, valutazione dei rischi, d.lgs. 81/2008
Keywords: psycho-social risks, work-related stress, mobbing, violence at work, risk assessement, delegated decree 81/2008
description: I Working papers di Olympus, N° 2 (2011): La valutazione del rischio da stress lavoro-correlato ai sensi dell'art. 28 del d.lgs. 81/2008
Schema Inference on Wikidata
Creators: name: Werkmeister, Lucas
Publisher: name: Zenodo
Year: 2018
Subjects: wikidata
shape expressions

description: Wikidata, the free knowledge base in the Wikimedia movement, is used by various Wikimedia projects and third parties to provide machine-readable information and data. Its data quality is managed and monitored by its community using several quality control mechanisms, recently including formal schemas in the Shape Expressions language. However, larger schemas can be tedious to write, making automatic inference of schemas from a set of exemplary Items an attractive prospect.

This thesis investigates this option by updating and adapting the RDF2Graph program to infer schemas from a set of Wikidata Items, and providing a web-based tool which makes this process available to the Wikidata community. Though the resulting schemas are usually not fit for direct validation, they can still be useful as a form of describing the layout of an area of Wikidata’s data model, a way to notice potential issues in the source data, or a basis for a manually curated schema.
description: master-thesis-final.tar.gz is a tarball of the thesis' source code, from which it should be possible to build the thesis by running `make`; master-thesis-Lucas-Werkmeister.pdf is the PDF built directly by PDFLaTeX; and master-thesis-Lucas-Werkmeister-signed.pdf is a signed version of master-thesis-Lucas-Werkmeister.pdf, signed with the PortableSigner software using the author's certificate from the KIT CA.
Layered molecular outflows and disk substructures in YSOs: the HL Tau case
Creators: name: Bacciotti, Francesca
name: Podio, Linda
name: Nony, Thomas
name: Codella, Claudio
name: Garufi, Antonio
name: Fedele, Davide
name: Cabrit, Sylvie
name: Dougados, Catherine
Publisher: name: Zenodo
Year: 2023

description: The HL Tau young system includes the iconic ringed disk revealed by the first ALMA images, but also powerful outflows, in the form of a collimated atomic jet, a wide angle H2 wind and a conical CO outflow. During the recent ALMA-DOT campaign, conducted at 0."25 resolution, we found that the CO outflow shows a peculiar substructure in the velocity channel maps, consistent with a flow arranged in nested, detached flow surfaces with decreasing velocity toward the outer layers. This distribution is in line with the flow being an extended, inhomogeneous magnetized disk-wind launched from a region between 4 and 20 au from the star. As such, the outflow would be responsible for the removal of the excess angular momentum from the intermediate disk portion in which the effective turbulent viscosity is suppressed. In addition, the outermost layer appears to be launched from the region corresponding to the first ring from the source. An additional outer envelope appears to originate from the sixth ring at about 80 au from the source.  Overall, the results support recent non-ideal MHD models (e.g. Suriano et al. 2019) according to which magnetic instabilities in the disk produce at the same time inhomogeneous layered MHD winds and rings/gaps in the disk, alternatively to the action of yet elusive protoplanets. The outflow from at least other four targets show features similar to the HL Tau one. The study of such winds in the millimeter range proves therefore to be crucial for the investigation of the planet formation process.
Polymer grafted carbon nanotube reinforced ultra high molecular weight polyethylene fibre
Creators: name: Ma, Yue
Publisher: name: University of British Columbia
Year: 2014

description: In this research, a series of experiments have been conducted to develop a high performance ultra-high molecular weight polyethylene (UHMWPE) fibre with improved mechanical properties. A novel process was developed whereby polyethylene grafted multi-walled carbon nanotubes (PE-g-MWCNTs) were used to reinforce UHMWPE fibre. PE-g-MWCNT/UHMWPE fibres with remarkable modulus and tensile strength of 125.5 GPa and 4.0 GPa, respectively, were successfully fabricated and showed definite potential for reducing the weight of body armour. A systematic study was carried out to investigate the effects of gel spinning conditions on tensile properties and morphologies of UHMWPE fibre. Spinning parameters, including polymer concentration, spinning temperature and winding-up speed, were selected and studied systematically and the spinning condition of UHMWPE fibre was optimized by design of experiment. Intensive experiments were conducted to investigate the feasibility of reinforcing UHMWPE fibre with pristine multi-walled carbon nanotubes (MWCNTs). Various mechanical methods include ultra-sonication, ball milling, microfluidizing, etc. were applied for dispersing pristine MWCNTs. Studies on tensile properties and morphologies of formed MWCNT/ UHMWPE fibre demonstrated that pristine MWCNTs tend to exist in micro-meter size agglomerations and no improvement in tensile properties of the MWCNT/UHMWPE fibres was found. Finally, chemical functionalization of MWCNTs using a coupling agent and polymer grafting technology was studied. The effective modulus and strength of MWCNTs were calculated based on the ‘rule of mixture’. Compared to coupling agent functionalization, polymer grafting has been found to be more effective in improving reinforcement of MWCNTs in UHMWPE fibre due to a stronger load transfer on the interface. The reinforcement mechanism of polymer grafted MWCNTs was analyzed based on experimental observations.
La crisi della regola dell’esonero
Creators: name: Giubboni, Stefano
Publisher: name: Università degli Studi di Urbino "Carlo Bo"
Year: 2012

description: AbstractL’autore analizza le ragioni della progressiva crisi della classica regola dell’esonero datoriale dalla responsabilità civile per gli infortuni sul lavoro e le malattie professionali. L’idea di una esenzione dalle comuni regole risarcitorie nell’ambito applicativo dell’assicurazione contro gli infortuni sul lavoro ha subito un lento declino, ed oggi l’esonero del datore di lavoro non costituisce più la regola ma l’eccezione. The author analyses the declining relevance of a classic rule at the basis of the employer’s tort  liability for accidents at work and professional diseases. The idea of a general exemption of the employer from tort law within the industrial injuries system has progressively weakened up to the point of practically disappearing as a rule and only surviving as an exception. Parole chiave: infortuni sul lavoro e malattie professionali, responsabilità civile del datore di lavoroKeywords: accidents at work and professional diseases, employer’s liability
description: I Working papers di Olympus, N° 3 (2011): S. Giubboni, La crisi della regola dell’esonero
Hyper-Resolution Continental-Scale 3-D Aquifer Parameterization for Groundwater Modeling
Creators: name: De Graaf, Inge
name: Condon, Laura
name: Maxwell, Reed
Publisher: name: FID GEO
Year: 2020

description: Groundwater is the world's most important freshwater resource. Despite this importance, groundwater flow and interactions between groundwater and other parts of the hydrological cycle are often neglected or simplified in large-scale hydrological models. One of the challenges in simulating groundwater flow and continental to global scales is the lack of consistent globally available hydrogeological data. These input data are needed for a more realistic physical representation of the groundwater system, enabling the simulation of groundwater head dynamics and lateral flows. A realistic representation of the subsurface is especially important as large-scale hydrological models move to finer resolutions and aim to provide accurate and locally relevant hydrologic information everywhere. In this study, we aim at improving and extending on current available large-scale data sets providing information of the subsurface. We present a detailed aquifer representation for the continental United States and Canada at hyper resolution (250 × 250 m). We integrate local hydrogeological information, including observations of aquifer layer thickness, conductivity, and vertical structure, to obtain representative aquifer parameter values applicable to the continental scale. The methods used are simple and can be expanded to other parts of the world. Hydrological simulations were performed using the integrated hydrological model ParFlow and demonstrated improved model performance when using the new aquifer parameterization. Our results support that more detailed and accurate aquifer parameterization will advance our understanding of the groundwater system at larger scales.
Additional file 10 of Emergency remote teaching in higher education: mapping the first global online semester
Creators: name: Bond, Melissa
name: Bedenlier, Svenja
name: Marín, Victoria I.
name: Händel, Marion
Publisher: name: figshare
Year: 2021
Subjects: subject: Medicine
subject: Sociology
subject: FOS: Sociology
subject: 80699 Information Systems not elsewhere classified
subject: FOS: Computer and information sciences
subject: Cancer
subject: Science Policy

description: Additional file 10: Appendix S10. Technology used based on Bower’s (2016) typology (n = 282)
Roadmap of ALMA in Event Horizon Telescope Observations
Creators: name: Ramakrishnan, Venkatessh
Publisher: name: Zenodo
Year: 2023

description: The transformative science enabled by the Event Horizon Telescope (EHT) Observations has revealed the images of two supermassive black hole shadows (SMBH), SgrA and M87*. These results are the foundation for our attempt in expanding this study to SMBHs in nearby Universe with the ultimate objective of constraining the nature of accretion flows and test the precision of General Relativity and alternate models to the best possible extent. We thus explain the approach taken to study the opacity of accretion flows in nearby AGNs while in parallel trying to prepare for deep EHT observations.
The multi-armed bandit problem with covariates
Creators: name: Perchet, Vianney
name: Rigollet, Philippe
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: We consider a multi-armed bandit problem in a setting where each arm produces a noisy reward realization which depends on an observable random covariate. As opposed to the traditional static multi-armed bandit problem, this setting allows for dynamically changing rewards that better describe applications where side information is available. We adopt a nonparametric model where the expected rewards are smooth functions of the covariate and where the hardness of the problem is captured by a margin parameter. To maximize the expected cumulative reward, we introduce a policy called Adaptively Binned Successive Elimination (abse) that adaptively decomposes the global problem into suitably "localized" static bandit problems. This policy constructs an adaptive partition using a variant of the Successive Elimination (se) policy. Our results include sharper regret bounds for the se policy in a static bandit problem and minimax optimal regret bounds for the abse policy in the dynamic problem.
description: Published in at http://dx.doi.org/10.1214/13-AOS1101 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Substructure and Fragmentation in Starless Cores
Creators: name: Fielder, Samuel
Publisher: name: Zenodo
Year: 2023

description: We present ALMA observations of 73 starless and protostellar cores in the Orion B North molecular cloud. In Band 3, we detect a total of 34 continuum sources, of which 4 appear to be starless. We use synthetic observations of simulations to compute the expected number of starless cores. We find at least one starless core should be detectable, consistent with our data.
We also run a virial analysis of the cores to put the Orion B North observations into context with similar previous ALMA surveys of cores in Chamaeleon and Ophiuchus and conclude that the Chamaeleon I starless core population is characteristically less bounded. These differences may explain why the Chamaeleon I cores do not follow the turbulent fragmentation model predictions, while the Ophiuchus and Orion B North cores are consistent with the model.
A new framework for generalized Besov-type and Triebel-Lizorkin-type spaces
Creators: name: Liang, Yiyu
name: Yang, Dachun
name: Yuan, Wen
name: Sawano, Yoshihiro
name: Ullrich, Tino
Publisher: name: arXiv
Year: 2012
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46E35 (Primary) 42B35, 42B25, 42B15, 42C40 (Secondary)

description: In this paper, the authors propose a new framework under which a theory of generalized Besov-type and Triebel-Lizorkin-type function spaces is developed. Many function spaces appearing in harmonic analysis fall under the scope of this new framework. Among others, the boundedness of the Hardy-Littlewood maximal operator or the related vector-valued maximal function on any of these function spaces is not required to construct these generalized scales of smoothness spaces. Instead of this, a key idea used in this framework is an application of the Peetre maximal function. This idea originates from recent findings in the abstract coorbit space theory obtained by Holger Rauhut and Tino Ullrich. Under this new setting, the authors establish the boundedness of pseudo-differential operators based on atomic and molecular characterizations and also the boundedness of the Fourier multipliers. The characterizations of these function spaces by means of differences and oscillations are also established. As further applications of this new framework, the authors reexamine and polish some existing results for many different scales of function spaces.
Relations between the Kahler cone and the balanced cone of a Kahler manifold
Creators: name: Fu, Jixiang
name: Xiao, Jian
Publisher: name: arXiv
Year: 2012
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: In this paper, we consider a natural map from the Kahler cone to the balanced cone of a Kahler manifold. We study its injectivity and surjecticity. We also give an analytic characterization theorem on a nef class being Kahler.
description: Some corrects have been made
Spectrum management at JAO and synergies with other entities
Creators: name: Siringo, Giorgio
Publisher: name: Zenodo
Year: 2023

description: I give here an overview of the activities of the JAO Spectrum Management Office, in synergy with other entities engaged in similar activities, in Chile and abroad. The common goal is to protect ground based radio astronomy from radio interference by developing strategies to control and regulate radio frequency emissions at national and international level.
Heterogeneity of metal content of three main-belt asteroids from high-resolution ALMA data
Creators: name: Phua, Yu Yu
name: de Kleer, Katherine
name: Cambioni, Saverio
name: Butler, Bryan
name: Shepard, Michael
Publisher: name: Zenodo
Year: 2023

description: ALMA is able to spatially resolve main-belt asteroids at millimeter wavelengths, which allows for detecting surface heterogeneity via spatial variations in thermal properties across their surfaces. Resolving these 0.1-0.2" objects at thermal wavelengths is not possible with infrared telescopes today but is now possible with ALMA. In this work, we have obtained 1.3 mm thermal emission data from ALMA for three asteroids at ~30 km resolution (the asteroid diameters are 200-250 km): a stony (S-type) asteroid (15) Eunomia, and two metal (M-type) asteroids (16) Psyche (de Kleer et al. 2021) and (22) Kalliope. Studies of thermal emission of asteroids are relevant for understanding the regolith properties and composition, from which we can infer the nature and evolutionary processes occurring on the underlying body. Comparing the spatial variations in thermal and dielectric properties of the stony and metal asteroids can provide insights into how regolith properties relate with compositional variations arising from formation and/or differentiation of the parent planetesimal. We have applied a thermophysical model to ALMA 1.3 mm thermal emission data to derive the best-fit global values as well as area-by-area fits of thermal inertia and millimeter emissivity of the three asteroids. The thermophysical model we have used is based on Delbo et al. (2015), and adapted to take into account the spatially resolved thermal emission data including subsurface emission (de Kleer et al. 2021; Cambioni et al. 2022).
Black hole perturbation in the most general scalar-tensor theory with second-order field equations I: The odd-parity sector
Creators: name: Kobayashi, Tsutomu
name: Motohashi, Hayato
name: Suyama, Teruaki
Publisher: name: arXiv
Year: 2012
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: We perform a fully relativistic analysis of odd-type linear perturbations around a static and spherically symmetric solution in the most general scalar-tensor theory with second-order field equations in four-dimensional spacetime. It is shown that, as in the case of general relativity, the quadratic action for the perturbations reduces to the one having only a single dynamical variable, from which concise formulas for no-ghost and no-gradient instability conditions are derived. Our result is applicable to all the theories of gravity with an extra scalar degree of freedom. We demonstrate how the generic formulas can be applied to some particular examples such as the Brans-Dicke theory, $f(R)$ models, and Galileon gravity.
description: 10 pages; v2. matches the published version in Phys. Rev. D; v3. typos in Eqs. (A1), (A3)--(A5) fixed, results unchanged; v4. a typo in Eq. (24) fixed, results unchanged; v5. a typo in Eq. (14) fixed, results unchanged
Operational Aspects of ALMA Flux Density Calibration
Creators: name: Kneissl, Rüdiger
name: Plarre, Kurt
name: Radiszcz, Matias
name: Verdugo, Celia
name: Guzman, Andres
name: Dent, William
name: Kameno, Seiji
name: Nowajewski, Priscilla
name: Sawada, Tsuyoshi
Publisher: name: Zenodo
Year: 2023

description: The Atacama Large Millimeter-/submillimeter Array (ALMA, see Technical Handbook, TH) uses models of planetary objects, primarily Uranus, and quasars, as secondary calibrators, for the absolute calibration of the flux density (flux), while direct methods using the calibration devices, termed System Equivalent Flux Density (SEFD) have been explored. Recently ALMA Science Operations improved the procedure for quasar flux monitoring in terms of observational efficiency and calibration accuracy. A special scheduling algorithm, termed Per-Source Observing (PSO), was implemented in mid-2022 to allow updates of the quasar fluxes as needed per source and per band, and as conditions allow. Frequently used flux and bandpass calibrators are monitored with higher Band 3 cadence (3-5 days) and up to Band 9, significantly improving specifically high-frequency (HF, Bands 8,9&10) flux calibration. In accordance, the Flux estimation Service (FS) of the ALMA Calibrator Source Catalogue (SC) introduced a fitting algorithm on well-sampled quasars for the queries run by the Pipeline during data reduction, which is being extended from linear to quadratic terms in log-log frequency for specified bands, for example Band 1 and HF observing. In this presentation we describe the new methods and their evaluation in the context of efficiency of observational procedures and the ALMA flux calibration accuracy, giving reference also to related conference contributions.
Probing AGN Molecular Torus via Emission, Absorption, and Polarization
Creators: name: Kameno, Seiji
Publisher: name: Zenodo
Year: 2023

description: A molecular torus in the central parsec scale of active galactic nuclei (AGNs) is a key component that plays important roles of mass accretion, jet collimation, and diversity in appearance depending on viewing angles. Using ALMA and VLBI, we have tackled to unveil physical properties of AGN tori via molecular emission and absorption lines, plasma free-free absorption, and polarimetry. We will present a representative case on the nearby radio galaxy, NGC 1052. This AGN emanates a double-sided jet that casts molecular absorption and plasma free-free absorption features toward the bright synchrotron emission. It also exhibits H2O maser emissions at 22 GHz and 321 GHz, which amplifies background continuum emission through population-inverted H2O molecules in the torus. Abnormally high H13CO-to-H12CO ratio implies high column density one order of magnitude greater than that estimated by X-ray spectroscopy and small covering factor of ~0.17 which is consistent with spatially resolved VLBI opacity map. Sulfur-bearing absorption features indicate jet-torus interaction which generates shocks that heat dust grains. Polarimetry allows us to measure the orientation of magnetic fields inside the molecular torus. In my talk, I'll report highlights of emission and absorption studies on AGNs which would be more productive with WSU.