cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On the limiting Markov process of energy exchanges in a rarely interacting ball-piston gas
Creators: name: Bálint, Péter
name: Gilbert, Thomas
name: Nándori, Péter
name: Szász, Domokos
name: Tóth, Imre Péter
Publisher: name: arXiv
Year: 2015
Subjects: subject: Dynamical Systems (math.DS)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We analyse the process of energy exchanges generated by the elastic collisions between a point-particle, confined to a two-dimensional cell with convex boundaries, and a `piston', i.e. a line-segment, which moves back and forth along a one-dimensional interval partially intersecting the cell. This model can be considered as the elementary building block of a spatially extended high-dimensional billiard modeling heat transport in a class of hybrid materials exhibiting the kinetics of gases and spatial structure of solids. Using heuristic arguments and numerical analysis, we argue that, in a regime of rare interactions, the billiard process converges to a Markov jump process for the energy exchanges and obtain the expression of its generator.
description: 23 pages, 6 figures
Sample-dependent first-passage time distribution in a disordered medium
Creators: name: Luo, Liang
name: Tang, Lei-Han
Publisher: name: arXiv
Year: 2015
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Subcellular Processes (q-bio.SC)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Above two dimensions, diffusion of a particle in a medium with quenched random traps is believed to be well-described by the annealed continuous time random walk (CTRW). We propose an approximate expression for the first-passage-time (FPT) distribution in a given sample that enables detailed comparison of the two problems. For a system of finite size, the number and spatial arrangement of deep traps yield significant sample-to-sample variations in the FPT statistics. Numerical simulations of a quenched trap model with power-law sojourn times confirm the existence of two characteristic time scales and a non-self-averaging FPT distribution, as predicted by theory.
description: 9 pages, 5 figures
Identification of chemicals that mimic transcriptional changes associated with autism, brain aging and neurodegeneration
Creators: name: Zylka, Mark J.
name: Pearson, Brandon L.
name: Fragola, Giulia
name: McCoy, Eric S.
name: Simon, Jeremy M.
name: Salazar, Gabriela
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: Environmental factors, including pesticides, have been linked to autism and neurodegeneration risk using retrospective epidemiological studies. Here we sought to prospectively identify chemicals that share transcriptomic signatures with neurological disorders, by exposing mouse cortical neuron-enriched cultures to hundreds of chemicals commonly found in the environment and on food. We find that rotenone, a pesticide associated with Parkinson's disease risk, and certain fungicides, including pyraclostrobin, trifloxystrobin, famoxadone and fenamidone, produce transcriptional changes in vitro that are similar to those seen in brain samples from humans with autism, advanced age and neurodegeneration (Alzheimer's disease and Huntington's disease). These chemicals stimulate free radical production and disrupt microtubules in neurons, effects that can be reduced by pretreating with a microtubule stabilizer, an antioxidant, or with sulforaphane. Our study provides an approach to prospectively identify environmental chemicals that transcriptionally mimic autism and other brain disorders.
Big Data: Privacy and Intellectual Property in a Comparative Perspective
Creators: name: Sartore, Federico
Publisher: name: Universit� degli studi di Trento
Year: 2016

description: Big Data is the fastest technology trend of the last few years. Its promises ranges from a philosophical revolution to a massive boost to business and innovation. These great expectations come along with risks and fears about the dissolution of the traditional categories of privacy and anti-competitive effects on business. In particular, the dark side of Big Data concerns the incremental adverse effect on privacy, the notorious predictive analysis and its role as an effective barrier for the market. The first stage of the legal analysis consists in an operative definition of Big Data, useful to build up a common background for further legal speculations. Data deluge, the exponential growth of data produced on a daily basis in every field of knowledge, is considered the base for the existence of a Big Data world. As a result, the practical applications of the data analysis involve healthcare, smart grids, mobile devices, traffic management, retail and payments. Moreover, the role played by open data initiatives around the world may strongly synergize with Big Data. The main issues identified are studied through a comparative analysis of three different legal systems: US, Canada and EU. Notably, the origins of privacy in the US are considered to sketch the line toward the US policy is moving. On the other hand, the current draft of the General Data Protection Regulation on EU level is completely changing the landscape of data protection. Finally, the European influence is clearly perceivable on the Canadian legislation. Although the level of protection granted slightly differ, it is still possible to identify the common consequences of the rise of Big Data on the legal categories. In particular, the fall and redefinition of the concept of PII, the question whether the binomial anonymization/re-identification may still exist, data minimization and individual control. The attempt of this paper is to provide a multi-layered solution given to the so-called Big Data conundrum. Consequently, the single layers are represented by: proactive privacy protection methods, self regulation and transparency, a model of due process applicable to data processing. The second part of this paper is dedicated to answer a challenging question: whether or not IP traditional categories are suited to work with Big Data practices. This section of the work focuses on the different practices used in the market before summing up the common traits. In this way, pros and cons of the application of the traditional IP legal constructs are considered having regard of a general category of Big Data practice. Eventually, the lack in the current legal landscape of an IP construct able to meet the needs of the industry suggests to imagine the main characteristics of a new dataright.
Supplementary documentation for SAEON's field instrument data collected at the Cathedral Peak 9A station
Creators: name: South African Environmental Observation Network (SAEON) Grasslands-Forests-Wetlands Node
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: SAEON field instruments
Standard Operating Procedures
Calibration
Cathedral Peak
Meteorological
Tipping bucket
Precipitation

description: This package contains supporting information for the meteorological data collected at Cathedral Peak's 9A station, as part of the South African Environmental Observation Network's monitoring projects.
title: Analysis of Plasma Filaments with Fast Visible Imaging in the Mega Ampère Spherical Tokamak
Creators: name: Farley, Thomas
Publisher: name: University of Liverpool Repository
Year: 2020

description: The cross-field transport of particles in the scrape-off layer (SOL) of magnetic fusion devices is dominated by the convection of coherent filamentary plasma structures. In this thesis, we present a new technique for the analysis of filaments in fast visible camera data. The new technique operates by inverting the background subtracted emission in the camera images onto a basis set of uniformly emitting field line images, constructed using information from magnetic equilibrium reconstructions. The output of the inversion is a 2D mapping of emission parametrising the average intensity of field lines in the SOL by the coordinates of their intersection with the mid-plane. Filaments manifest in the inverted emission profile as blobs of raised emission. A filament detection technique has been developed to identify these regions of increased emission and fit them with 2D Gaussians. This yields the positions, widths and amplitudes of the filaments. A tracking algorithm is then applied to calculate the filaments velocities and lifetimes. Data from a synthetic camera diagnostic is used to assess the capabilities and limitations of the new technique and quantify its errors. This exercise shows it can detect ~36% of all filaments in the analysis region, corresponding to ~74% of filaments above the targeted amplitude threshold. This sensitivity is achieved with a true positive detection rate of 98.8%. Standard errors in the radial and toroidal positions of the filaments are estimated to be ~2 mm, while errors in the toroidal and radial widths are around ~3 mm and ~7 mm respectively. The shapes of the probability density functions (PDFs) of the filament parameters are also qualitatively recovered and the effect of filament overlap on filament amplitude measurements is investigated. Valuable insight is gained into effects from the non-orthogonality of the field line basis functions and the resulting spatial dependence of the measurement errors. Finally, the technique is applied to MAST data and compared to Langmuir probe measurements. Good agreement is found between the two diagnostics, including exponential waiting times and symmetrical conditionally averaged waveforms. Measurements of the PDFs of filament properties provide valuable inputs for analytic models of SOL transport and show filament lifetimes to be exponentially distributed. The depth of field of the technique enables measurement of the toroidal filament spacing, with results supporting the assertion that filaments are generated uniformly and independently, and are thus described by Poisson statistics underpinning several analytic models.
Assessing Forest Cover Outcomes: A two-part analysis of development outcomes in Huntersville, North Carolina
Creators: name: Ownbey, Ashley
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2020

description: This paper reports the results of a forest cover analysis for Huntersville, North Carolina. The analysis finds Huntersville’s sphere of influence to have experienced minor forest cover losses between 2010 and 2018 and to be one of the most well-forested in Mecklenburg County. In addition to the forest cover analysis, this paper reports the findings of a smaller-scale, site analysis of four residential subdivisions. These subdivisions were selected to compare developments before and after a policy shift in Huntersville that reduced the density and intensity of residential development outside of Huntersville’s town core. The results of the site analysis reveal minor differences in percentages of tree canopy and shared open space for developments of varying densities, with the denser developments having just as much or higher percentages of tree canopy than the less dense developments. The interests of this paper exist at the intersection of literatures on changing land patterns and land use policy monitoring and evaluation. These literatures drive the final recommendations of the paper, which are the adoption of evaluation procedures to examine development outcomes for residential subdivisions and the use of inventories and open-source technology to better track and map trees within a community.
Loss of UBE3A from TH-expressing neurons suppresses GABA co-release and enhances VTA-NAc optical self-stimulation
Creators: name: Kantak, Pranish A.
name: Aita, Megumi
name: Philpot, Benjamin D.
name: Berrios, Janet
name: Judson, Matthew C.
name: McElligott, Zoe A.
name: Stuber, Garret D.
name: Rougie, Marie
name: Stamatakis, Alice M.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: Motivated reward-seeking behaviours are governed by dopaminergic ventral tegmental area projections to the nucleus accumbens. In addition to dopamine, these mesoaccumbal terminals co-release other neurotransmitters including glutamate and GABA, whose roles in regulating motivated behaviours are currently being investigated. Here we demonstrate that loss of the E3-ubiquitin ligase, UBE3A, from tyrosine hydroxylase-expressing neurons impairs mesoaccumbal, non-canonical GABA co-release and enhances reward-seeking behaviour measured by optical self-stimulation.
Investigation of Post-Processing Resistivity Modification Methods for HV-CMOS Pixel Detectors
Creators: name: Holmkvist, William
Publisher: name: Lancaster University
Year: 2022
Subjects: HV-CMOS
TCT

description: Silicon detectors plays a key-role in the measurement of particle trajectories in cur- rent particle collision experiments. Future colliding experiments will impose even larger demands on the performance of the detectors. To meet these demands, while simulta- neously keeping costs low, monolithic active silicon sensors using HV-CMOS technology are currently investigated. While showing good promise, many semiconductor foundries do not allow for custom substrate resistivity, making it interesting to investigate whether standard substrate HV-CMOS sensors are a viable option for future high energy particle detectors. To this end, this thesis presents a study on how the charge collection and effective doping concentration are affected by hadron irradiation in HV-CMOS detector prototypes. The investigated prototypes were produced at two different foundries, Austria Micro Systems and LFoundry, and were irradiated with either protons or reactor neutrons. Edge-TCT, using pulsed IR light injection, was the main tool of investigation. Proton irradiated samples were found to perform significantly better after fluences of 5 · 1014 neq/cm2. The neutron irradiated samples had a significant reduction charge collection in spite of an increased depletion region after 1015 neq/cm2. Additionally, all samples showed a decrease in charge collection in the fluence region 1013 - 1014 neq/cm2. Following these, low-resistivity HV-CMOS detectors might not be optimal for some particle collider environments, but could be of use for prototyping with foundries not offering custom resistivity substrates. Additionally, as an attempt to improve performance Thermal Donor introduction was investigated as a method to increase the active region in low resistivity HV-CMOS sensors. Samples were annealed at 450 ◦C at increasing time intervals, and measured using edge-TCT. Introduction rates were found to deviate greatly from estimated values, and Thermal Donor introduction was ultimately concluded not viable as a method to improve detector performance.
The superfluid Reynolds number and the transition from potential flow to turbulence in superfluid $^4$He at mK temperatures
Creators: name: Schoepe, Wilfried
Publisher: name: arXiv
Year: 2015
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: This comment is on Phys.Rev.Lett. 144, 155302 (2015) by M.T. Reeves, T.P. Billam, B.P. Anderson, and A.S. Bradley "Identifying a superfluid Reynolds number via dynamical similarity" where a new superfluid Reynolds number is introduced. This definition is shown to be useful in the data analysis of the finite lifetime of turbulence observed with an oscillating sphere in superfluid helium at mK temperatures in a small velocity interval $Δv =(v-v_c)$ just above the critical velocity $v_c$. The very rapid increase of the lifetime with increasing superfluid Reynolds number is compared with the "supertransient" turbulence observed in classical pipe flow.
description: 3 pages, 1 figure
The Schrödinger Equation in the Mean-Field and Semiclassical Regime
Creators: name: Golse, François
name: Paul, Thierry
Publisher: name: arXiv
Year: 2015
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 82C10, 35Q41, 35Q55, 82C05, 35Q83

description: In this paper, we establish (1) the classical limit of the Hartree equation leading to the Vlasov equation, (2) the classical limit of the $N$-body linear Schrödinger equation uniformly in N leading to the N-body Liouville equation of classical mechanics and (3) the simultaneous mean-field and classical limit of the N-body linear Schrödinger equation leading to the Vlasov equation. In all these limits, we assume that the gradient of the interaction potential is Lipschitz continuous. All our results are formulated as estimates involving a quantum analogue of the Monge-Kantorovich distance of exponent 2 adapted to the classical limit, reminiscent of, but different from the one defined in [F. Golse, C. Mouhot, T. Paul, Commun. Math. Phys. 343 (2016), 165-205]. As a by-product, we also provide bounds on the quadratic Monge-Kantorovich distances between the classical densities and the Husimi functions of the quantum density matrices.
description: 33 pages
Fossil coal substitution by plastic injection in EAF steel production
Creators: name: Cirilli, Filippo
name: Mirabile, Daphne
name: Bianco, Loris
name: Chini, Matteo
name: Gaspardo, Daniele
Publisher: name: Zenodo
Year: 2022
Subjects: plastic recovery, polymers, EAF injection, carbon substitution

description: The H2020 project POLYNSPIRE has been launched to demonstrate a set of innovative, cost effective and sustainable solutions, aiming at improving the energy and resource efficiency of post-consumer and post-industrial plastic recycling processes The mix of polymers, discharged at the end of plastic recovery chain, can be used in the steel sector with the aim to recovery their carbon content replacing the fossil coal currently used in the Electric Arc Furnace (EAF) process. Within the POLYNSPIRE project, a new injection system has been designed and installed in the EAF of Ferriere Nord steel factory in Osoppo. After the commissioning of the system, about 2400 heats have been carried out partially replacing the pulverized anthracite (up to 50%). The trials have been carried out in different conditions of variable amount of plastic (up to 50% respect injected coal). Analysis about the effect of polymers injection within the EAF process has been carried out analysing more than 40 process variables considered as a performance indicator. The results on main indicators as slag composition (mainly FeO content), Total Harmonic Distortion, Sound Pressure Level, Average Active Power, Metallic yield are discussed. The main results of such analyses indicate that plastic can be used to replace coal, at least up to 50%. EAF energy performance is not varied by plastic utilization.
Supplementary documentation for SAEON's field instrument data collected at the Cathedral Peak MET 2 Texas station
Creators: name: South African Environmental Observation Network (SAEON) Grasslands-Forests-Wetlands Node
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: SAEON field instruments
Standard Operating Procedures
Calibration
Cathedral Peak
Meteorological
Tipping bucket
Precipitation

description: This package contains supporting information for the meteorological data collected at Cathedral Peak's MET 2 Texas station, as part of the South African Environmental Observation Network's monitoring projects.
Visualizing long vectors of measurements by use of the Hilbert curve
Creators: name: Estevez-Rams, E.
name: Perez-Davidenko, C.
name: Fernández, B. Aragón
name: Lora-Serrano, R.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The use of Hilbert curves to visualize massive vector of data is revisited following previous authors. The Hilbert curve mapping preserves locality and makes meaningful representation of the data. We call such visualization as Hilbert plots. The combination of a Hilbert plot with its Fourier transform allows to identify patterns in the underlying data sequence. The use of different granularity representation also allows to identify periodic intervals within the data. Data from different sources are presented: periodic, aperiodic, logistic map and 1/2-Ising model. A real data example from the study of heartbeat data is also discussed.
description: Accepted at Computer Physics Communications
Relaxation of interstitials in spherical colloidal crystals
Creators: name: Roshal, D. S.
name: Myasnikova, A. E.
name: Rochal, S. B.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: Spherical colloidal crystals (CCs) self-assemble on the interface between two liquids. These 2D structures unconventionally combine local hexagonal order and spherical geometry. Nowadays CCs are actively studied by altering their structures. However, the statistical analysis of such experiments results is limited by uniqueness of self-assembled structures and their short lifetime. Here we perform numerical experiments to investigate pathways of CC structure relaxation after the intrusion of interstitial. The process is simulated in the frames of overdamped molecular dynamics method. The relaxation occurs due to interaction with extended topological defects (ETDs) mandatory induced in spherical CCs by their intrinsic Gaussian curvature. Types of relaxation pathways are classified and their probabilities are estimated in the low-temperature region. To analyze the structural changes during the relaxation we use a parent phase approach allowing us to describe the global organization of spherical order. This organization is preserved by only the most typical relaxation pathway resulting in filling one of vacancies integrated inside the ETD areas. In contrast with this pathway the other ones shift the ETDs centers and can strongly reconstruct the internal structure of ETDs. Temperature dependence of the relaxation processes and the mechanism of dislocation unbinding are discussed. Common peculiarities in relaxation of spherical structures and particular fragments of planar hexagonal lattice are found.
description: 12 pages, 3 figures, this version has been accepted for publication in Physica E
title: Applied Data Science Methods in Epitranscriptomic Bioinformatics
Creators: name: Wei, Zhen
Publisher: name: University of Liverpool Repository
Year: 2020

description: Chemical modifications on messenger RNA have been recently revealed by biological researchers to function as an essential layer of gene expression regulation. Molecular biologists from different laboratories have conducted more than 200 sets of high throughput sequencing experiments trying to capture the types and locations of messenger RNA modifications across multiple cell types and species. However, until this date, the field still lacks a bioinformatics pipeline to quantify and analyze the epitranscriptomic HTS data generated from different laboratories consistently. The thesis aims to provide an overview of questions and challenges arisen in the field of mRNA modification computational analysis. Subsequently, we will present a set of practical computational strategies for data explorations, genomic data mining, modification level quantifications, and technical artifact corrections from a data science perspective. The first chapter of the thesis provides an in-depth data exploration and visualization of m5C mRNA modification from bisulfite sequencing data. In the second chapter, we document the database construction and data consistency exploration for the transcriptomic targets of the mRNA modification related protein regulators. Besides, the second chapter presents a methodological framework for the computational representation of the domain knowledge related to the transcriptomic topology of epitranscriptomic modification. The final section of the thesis discusses the dominant technical biases existed in MeRIP-Seq, the most widely applied type of HTS data in epitranscriptomics, and it follows with a practical computational pipeline to overcome the technical error.
Population dynamics of Protea nana in Matroosberg, Ben Etive, site 3319AD/1
Creators: name: Jonkershoek Forestry Research Center
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: Jonkershoek Forestry Research Centre
Matroosberg
Protea nana

description: This is a scanned copy of a document noting the population dynamics of Protea nana in monitoring site 3319AD-1 in Matroosberg. The Jonkershoek Forestry Research Center (part of the former South African Forestry Research Institute) was established in 1935 at Jonkershoek, near Stellenbosch, under the directorship of Dr C. L. Wicht. The initial aim was to determine how forestry activities in state plantations would affect climate, water conservation and erosion, and was later expanded to include studies of fynbos ecology, fire and alien species. Studies from the 1930s to the early 1990s saw the accumulation of a large amount of data dealing with fire experiments, detailed vegetation plot surveys, rare plant surveys and ecological studies, hydrological studies and the development of management plans for catchments around the Western Cape. SAEON now houses the archive of data collected by the Jonkershoek Forestry Research Center, which was originally held by the Council for Scientific and Industrial Research (CSIR).
Higgs Inflation and General Initial Conditions
Creators: name: Zeynizadeh, Sarang
name: Akbarieh, Amin Rezaei
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Higgs field of particle physics can play the role of the inflaton in the early universe, if it is non-minimally coupled to gravity. The Higgs inflation scenario predicts a small tensor to scalar ratio: $r\simeq 0.003$. Although this value is consistent with the upper bound $r < 0.12$ given by BICEP2/Keck Array and Planck data, but it is not at their maximum likelihood point: $r\simeq 0.05$. Inflationary observables depend not only on the inflationary models, but also depend on the initial conditions of inflation. Changing initial state of inflation can improve the value of $r$. In this work, we study the Higgs inflation model under general initial conditions and show that there is a subset of these general initial conditions which leads to enhancement of $r$. Then we show that this region of parameter space is consistent with non-Gaussianity bound.
description: 13 pages, 2 figures
Photo plot in Hottentots Holland, Jakkalsrivier Catchment experiment, site 3419AA/1/M/1
Creators: name: Jonkershoek Forestry Research Center
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: Jonkershoek Forestry Research Centre
Hottentots Holland
Photo plot
Jakkalsrivier Catchment

description: This is a scanned copy of a document on a photo plot in Hottentots Holland, Jakkalsrivier Catchment experiment, site 3419AA/1/M/1. The Jonkershoek Forestry Research Center (part of the former South African Forestry Research Institute) was established in 1935 at Jonkershoek, near Stellenbosch, under the directorship of Dr C. L. Wicht. The initial aim was to determine how forestry activities in state plantations would affect climate, water conservation and erosion, and was later expanded to include studies of fynbos ecology, fire and alien species. Studies from the 1930s to the early 1990s saw the accumulation of a large amount of data dealing with fire experiments, detailed vegetation plot surveys, rare plant surveys and ecological studies, hydrological studies and the development of management plans for catchments around the Western Cape. SAEON now houses the archive of data collected by the Jonkershoek Forestry Research Center, which was originally held by the Council for Scientific and Industrial Research (CSIR).
Household Energy Usage and Political Awareness in Ohio
Creators: name: Janaya Harris
Publisher: name: Unknown
Year: 2024
Subjects: subject: political awareness
subject: household energy
subject: natural gas
subject: nuclear energy
subject: nuclear disaster
subject: vegetarianism
subject: food production
subject: industrial agriculture
subject: youth culture

description: Janaya Harris interviews Patrick Davis about his experiences with energy living in Toledo and Columbus, Ohio. Davis remembers growing up in a household that used gas for heating and cooking and did not have air conditioning. He also recalls witnessing Toledo's use of coal-powered electricity and nuclear energy, supplied by a nearby power station. Davis describes being aware of nuclear disasters at the time, but only realizing the extent of the danger in hindsight. Davis also discusses energy usage now, in Columbus, where he lives in a house that uses electricity, not gas, and where there is a solar field nearby. He reflects on his concerns about the environment, problems with consumerism, and feelings of hopelessness, along with his experience as a former vegetarian and his awareness of industrial food production. Davis also recalls coming into political awareness through encounters with the punk scene as a teenager.
Ubaldino Peruzzi a Luigi Ridolfi (12 marzo 1871)
Creators: name: Peruzzi, Ubaldino
name: Ridolfi, Luigi
Publisher: name: Zenodo
Year: 2023
Subjects: Accademia dei Georgofili
Peruzzi, Ubaldino
Ridolfi, Luigi
Lettera
Letter
Carteggio
Correspondence
1871

description: Lettera di Ubaldino Peruzzi a Luigi Ridolfi del 12 marzo 1871. Segnatura dell’unità documentale: Archivio storico dell’Accademia dei Georgofili, Carteggio, Busta 36, 4630. Natura: manoscritto. Consistenza: cc. 2
description: Digitalizzato come parte della Mostra virtuale: Ubaldino Peruzzi : un percorso in rete : in occasione del bicentenario della nascita https://www.georgofili.it/contenuti/ubaldino-peruzzi-un-percorso-in-rete/17485
Die Wahrscheinlichkeit der Einheitskreisscheibe bei unabhängig standardnormalverteilten Zufallsvariablen im R²
Creators: name: Schröer, Harald
Publisher: name: Zenodo
Year: 2019
Subjects: Wahrscheinlichkeit, Einheitskreisscheibe, unabhängig, Zufallsvariable, Zufallsgröße, R², standard, Normalverteilung

description: Eine Standardnormalverteilung unabhängig verteilt wird vorausgesetzt. Es wird die Wahrscheinlichkeit der Einheitskreisscheibe im R² berechnet.
Network dynamics in nanofilled polymers
Creators: name: Kumar, Sanat K.
name: Gong, Shushan
name: Baeza, Guilhem P.
name: Dessi, Claudia
name: Zhao, Dan
name: Colby, Ralph H.
name: Alegria, Angel
name: Vlassopoulos, Dimitris
name: Costanzo, Salvatore
name: Rubinstein, Michael
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: It is well accepted that adding nanoparticles (NPs) to polymer melts can result in significant property improvements. Here we focus on the causes of mechanical reinforcement and present rheological measurements on favourably interacting mixtures of spherical silica NPs and poly(2-vinylpyridine), complemented by several dynamic and structural probes. While the system dynamics are polymer-like with increased friction for low silica loadings, they turn network-like when the mean face-to-face separation between NPs becomes smaller than the entanglement tube diameter. Gel-like dynamics with a Williams–Landel–Ferry temperature dependence then result. This dependence turns particle dominated, that is, Arrhenius-like, when the silica loading increases to ∼31 vol%, namely, when the average nearest distance between NP faces becomes comparable to the polymer's Kuhn length. Our results demonstrate that the flow properties of nanocomposites are complex and can be tuned via changes in filler loading, that is, the character of polymer bridges which ‘tie' NPs together into a network.
Ultrafast pulse generation with black phosphorus
Creators: name: Li, Diao
name: Jussila, Henri
name: Karvonen, Lasse
name: Ye, Guojun
name: Lipsanen, Harri
name: Chen, Xianhui
name: Sun, Zhipei
Publisher: name: arXiv
Year: 2015
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Black phosphorus has been recently rediscovered as a new and interesting two-dimensional material due to its unique electronic and optical properties. Here, we study the linear and nonlinear optical properties of black phosphorus thin films, indicating that both linear and nonlinear optical properties are anisotropic and can be tuned by the film thickness. Then we employ the nonlinear optical property of black phosphorus for ultrafast (pulse duration down to ~786 fs in mode-locking) and large-energy (pulse energy up to >18 nJ in Q-switching) pulse generation in fiber lasers at the near-infrared telecommunication band ~1.5 μm. Our results underscore relatively large optical nonlinearity in black phosphorus and its prospective for ultrafast pulse generation, paving the way to black phosphorus based nonlinear and ultrafast photonics applications (e.g., ultrafast all-optical switches/modulators, frequency converters etc.).
description: 21 pages, 4 figures
From Observational Studies to Causal Rule Mining
Creators: name: Li, Jiuyong
name: Le, Thuc Duy
name: Liu, Lin
name: Liu, Jixue
name: Jin, Zhou
name: Sun, Bingyu
name: Ma, Saisai
Publisher: name: arXiv
Year: 2015
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Randomised controlled trials (RCTs) are the most effective approach to causal discovery, but in many circumstances it is impossible to conduct RCTs. Therefore observational studies based on passively observed data are widely accepted as an alternative to RCTs. However, in observational studies, prior knowledge is required to generate the hypotheses about the cause-effect relationships to be tested, hence they can only be applied to problems with available domain knowledge and a handful of variables. In practice, many data sets are of high dimensionality, which leaves observational studies out of the opportunities for causal discovery from such a wealth of data sources. In another direction, many efficient data mining methods have been developed to identify associations among variables in large data sets. The problem is, causal relationships imply associations, but the reverse is not always true. However we can see the synergy between the two paradigms here. Specifically, association rule mining can be used to deal with the high-dimensionality problem while observational studies can be utilised to eliminate non-causal associations. In this paper we propose the concept of causal rules (CRs) and develop an algorithm for mining CRs in large data sets. We use the idea of retrospective cohort studies to detect CRs based on the results of association rule mining. Experiments with both synthetic and real world data sets have demonstrated the effectiveness and efficiency of CR mining. In comparison with the commonly used causal discovery methods, the proposed approach in general is faster and has better or competitive performance in finding correct or sensible causes. It is also capable of finding a cause consisting of multiple variables, a feature that other causal discovery methods do not possess.
description: This paper has been accepted by ACM TIST journal and will be available soon
The Hidden Flat Like Universe II: Quasi inverse power law inflation by $f(T)$ gravity
Creators: name: Hanafy, W. El
name: Nashed, G. G. L.
Publisher: name: arXiv
Year: 2015
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In a recent work, a particular class of $f(T)$ gravity, where $T$ is the teleparallel torsion scalar, has been derived. This class has been identified by flat-like universe (FLU) assumptions \cite{HN15}. The model is consistent with the early cosmic inflation epoch. A quintessence potential has been constructed from the FLU $f(T)$-gravity. We show that the first order potential of the induced quintessence is a quasi inverse power law inflation with an additional constant providing an end of the inflation with no need to an extra mechanism. At $e$-folds $N_{*}= 55$ before the end of the inflation, this type of potential can perform both $E$ and $B$ modes of the cosmic microwave background (CMB) polarization pattern.
description: 11 pages, 4 figures and 1 table. Minor changes to match the published version
Implications of $μ-τ$ Flavored CP Symmetry of Leptons
Creators: name: Mohapatra, R. N.
name: Nishi, C. C.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss gauge models incorporating $μ-τ$ flavored CP symmetry (called CP$^{μτ}$ in the text) in combination with $L_μ-L_τ$ invariance to understand neutrino mixings and discuss their phenomenological implications. We show that viable leptogenesis in this setting requires that the lightest right-handed neutrino mass must be between $10^9-10^{12}$ GeV and for effective two hierarchical right-handed neutrinos, leptogenesis takes place only in a narrower range of $5\times 10^{10}-10^{12}$ GeV. A multi-Higgs realization of this idea implies that there must be a pseudoscalar Higgs boson with mass less than 300 GeV. Generically, the vev alignment problem can be naturally avoided in our setting.
description: 34pp. v3: matches journal version
Neutralization mechanism of a highly potent antibody against Zika virus
Creators: name: Lok, Shee-Mei
name: Tan, Ter Yong
name: Zhang, Shuijun
name: Shi, Jian
name: Lambert, Sebastian
name: Ooi, Justin S. G.
name: Widman, Douglas G.
name: Kostyuchenko, Victor A.
name: Ng, Thiam-Seng
name: Baric, Ralph S.
name: Lim, Xin-Ni
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2016

description: The rapid spread of Zika virus (ZIKV), which causes microcephaly and Guillain-Barré syndrome, signals an urgency to identify therapeutics. Recent efforts to rescreen dengue virus human antibodies for ZIKV cross-neutralization activity showed antibody C10 as one of the most potent. To investigate the ability of the antibody to block fusion, we determined the cryoEM structures of the C10-ZIKV complex at pH levels mimicking the extracellular (pH8.0), early (pH6.5) and late endosomal (pH5.0) environments. The 4.0 Å resolution pH8.0 complex structure shows that the antibody binds to E proteins residues at the intra-dimer interface, and the virus quaternary structure-dependent inter-dimer and inter-raft interfaces. At pH6.5, antibody C10 locks all virus surface E proteins, and at pH5.0, it locks the E protein raft structure, suggesting that it prevents the structural rearrangement of the E proteins during the fusion event—a vital step for infection. This suggests antibody C10 could be a good therapeutic candidate.
title: Carbocations in Heterogeneous Catalysis Caught in the Act by (Dynamic Nuclear Polarization Enhanced) Multidimensional and Multinuclear Nuclear Magnetic Resonance
Creators: name: Xiao, Dong
Publisher: name: University of Liverpool Repository
Year: 2020

description: Probing and determining the carbocation intermediates formed during heterogenous catalytic reactions are crucial steps for understanding the reaction mechanisms, such as the methanol to hydrocarbon (MTH) reaction. Nevertheless, the observation of carbocations and their structural identification are not straightforward as they are reactive, transient, difficult to capture and exist in generally low concentrations and therefore their spectroscopic characterization is very challenging. Solid-state NMR is useful in detecting reactive carbocations on solid catalysts. However, previous NMR studies of carbocations were only limited to the use of one-dimensional (1D) NMR methods combining with some indirect methods to elucidate the carbocation structures, those methods require prior assumption of possible structures and may lead to misinterpretation. In this thesis, the carbocation intermediates formed in various zeolite catalysts under MTH conditions are directly identified via multidimensional NMR techniques which provide unambiguously experimental support for previously proposed structures and more importantly identify previously undetected ones. Moreover, the interactions between the confined carbocations and zeolite framework are quantitatively probed by multinuclear NMR methods. Since low sensitivity of NMR is also key limiting factor challenging NMR studies of carbocations, the advanced sensitivity enhancement technique known as dynamic nuclear polarization (DNP) is successfully applied to the detection of carbocations and their subsequent multidimensional and multinuclear NMR studies. These successful applications of DNP provide new opportunities for research on carbocations.
title: Three things we learned about the Lynx payment system
Creators: name: Chande, Nikil
name: Lu,  Zhentong
name: Rodrigo, Hiru
name: Tian, Phoebe
Publisher: name: Bank of Canada
Year: 2023

description: Canada transitioned to a new wholesale payment system, Lynx, in August 2021. Lynx is based on a real-time settlement model that eliminates credit risk in the system. This model can require more liquidity; however, Lynx’s design allows Canada’s wholesale payments to settle efficiently.
description: Le Canada est passé à un nouveau système de paiement de gros, Lynx, en août 2021. Lynx est fondé sur un modèle de règlement en temps réel qui élimine le risque de crédit dans le système. Ce modèle peut nécessiter plus de liquidités; cependant, la conception de Lynx permet le règlement efficient des paiements de gros au Canada.
The role of spin-flipping terms in hadronic transitions of $Υ(4S)$
Creators: name: Segovia, Jorge
name: Fernandez, Francisco
name: Entem, David R.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Recent experimental data on the $Υ(4S)\toΥ(1S)η$ and $Υ(4S)\to h_{b}(1P)η$ processes seem to contradict the naive expectation that hadronic transitions with spin-flipping terms should be suppressed with respect those without spin-flip. We analyze these transitions using the QCD Multipole Expansion (QCDME) approach and within a constituent quark model framework that has been applied successfully to the heavy-quark sectors during the last years. The QCDME formalism requires the computation of hybrid intermediate states which has been performed in a natural, parameter-free extension of our constituent quark model based on the Quark Confining String (QCS) scheme. We show that i) the M1-M1 contribution in the decay rate of the $Υ(4S)\toΥ(1S)η$ is important and its supression until now is not justified; ii) the role played by the $L=0$ hybrid states, which enter in the calculation of the M1-M1 contribution, explains the enhancement in the $Υ(4S)\toΥ(1S)η$ decay rate; and iii) the anomalously large decay rate of the $Υ(4S)\to h_{b}(1P)η$ process has the same physical origin.
description: 9 pages, 1 figure, 4 tables
Alsophila minervae Lehnert, Amer. Fern J.
Creators: name: Lehnert, Marcus
name: Kessler, Michael
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Polypodiopsida
Cyatheales
Cyatheaceae
Alsophila
Alsophila minervae

description: Alsophila minervae Lehnert, Amer. Fern J. 93(4): 169. 2003.
 Range: — Peru, Bolivia (CO, LP).
 Ecology: —Uncommon in cloud forests and elfin forests, in the understory or partially exposed; 2500–2900 m.
 Notes: —A species from high elevations, recognized by the dark purplish axes and the gradually reduced frond apex.
description: Published as part of Lehnert, Marcus & Kessler, Michael, 2018, Prodromus of a fern flora for Bolivia. XX. Cyatheaceae, pp. 118-134 in Phytotaxa 334 (2) on page 121, DOI: 10.11646/phytotaxa.334.2.2, http://zenodo.org/record/13721436
Catalytically generated N-acyliminium ions and their application in Diels-Alder reactions.
Creators: name: Owen, Niamh
Publisher: name: Lancaster University
Year: 2022

description: Society is currently facing major challenges in providing resources such as healthcare in a more sustainable manner. The production of pharmaceuticals relies heavily on the use of precious transition metals such as palladium and rhodium to mediate single transformations on route to desired bioactive substances. Although these transformations are often high yielding, the need to mine great quantities of these metals remains a concern. Therefore, synthetic chemists must strive to develop more environmentally friendly and sustainable chemistry to access desirable and important scaffolds. We report on the development of a novel route to tricyclic lactam products via a facile Aza-Diels-Alder reaction of catalytically generated N-acyliminium ions. Employing a Ca(NTf2)2 / nBu4NPF6 catalyst system in low loadings, to synthesise a diverse range of fused ring systems which differing electronic and steric properties in predominately good yields.
Supplementary documentation for SAEON's field instrument data collected at the Cathedral Peak CAT9 #5 station
Creators: name: South African Environmental Observation Network (SAEON) Grasslands-Forests-Wetlands Node
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: SAEON field instruments
Standard Operating Procedures
Calibration
Cathedral Peak
Hydrological
Soil Diviner tube
Soil water content

description: This package contains supporting information for the hydrological data collected at Cathedral Peak's CAT9 #5 station, as part of the South African Environmental Observation Network's monitoring projects.
Supplementary documentation for SAEON's field instrument data collected at the Jonkershoek Jonkershoek eddy covariance station
Creators: name: South African Environmental Observation Network (SAEON) Fynbos Node
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: SAEON field instruments
Standard Operating Procedures
Calibration
Jonkershoek
Micro meteorological
Extended open path eddy covariance
CO2 flux
H2O flux
net radiation
soil heat flux
rainfall
soil temperature
air temperature
humidity
soil moisture
wind speed
wind direction

description: This package contains supporting information for the micro meteorological data collected at Jonkershoek's Jonkershoek eddy covariance station, as part of the South African Environmental Observation Network's monitoring projects.
Supplementary documentation for SAEON's field instrument data collected at the Cathedral Peak CAT3 #6 station
Creators: name: South African Environmental Observation Network (SAEON) Grasslands-Forests-Wetlands Node
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: SAEON field instruments
Standard Operating Procedures
Calibration
Cathedral Peak
Hydrological
Soil Diviner tube
Soil water content

description: This package contains supporting information for the hydrological data collected at Cathedral Peak's CAT3 #6 station, as part of the South African Environmental Observation Network's monitoring projects.
Supplementary documentation for SAEON's field instrument data collected at the Cathedral Peak Weir 09 ISCO station
Creators: name: South African Environmental Observation Network (SAEON) Grasslands-Forests-Wetlands Node
Publisher: name: South African Environmental Observation Network
Year: 2022
Subjects: SAEON field instruments
Standard Operating Procedures
Calibration
Cathedral Peak
Hydrological
ISCO Sampler
Water samples

description: This package contains supporting information for the hydrological data collected at Cathedral Peak's Weir 09 ISCO station, as part of the South African Environmental Observation Network's monitoring projects.