cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Performance Analysis of 3-Dimensional Turbo Codes
Creators: name: Rosnes, Eirik
name: Amat, Alexandre Graell i
Publisher: name: arXiv
Year: 2011
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this work, we consider the minimum distance properties and convergence thresholds of 3-dimensional turbo codes (3D-TCs), recently introduced by Berrou et al.. Here, we consider binary 3D-TCs while the original work of Berrou et al. considered double-binary codes. In the first part of the paper, the minimum distance properties are analyzed from an ensemble perspective, both in the finite-length regime and in the asymptotic case of large block lengths. In particular, we analyze the asymptotic weight distribution of 3D-TCs and show numerically that their typical minimum distance dmin may, depending on the specific parameters, asymptotically grow linearly with the block length, i.e., the 3D-TC ensemble is asymptotically good for some parameters. In the second part of the paper, we derive some useful upper bounds on the dmin when using quadratic permutation polynomial (QPP) interleavers with a quadratic inverse. Furthermore, we give examples of interleaver lengths where an upper bound appears to be tight. The best codes (in terms of estimated dmin) obtained by randomly searching for good pairs of QPPs for use in the 3D-TC are compared to a probabilistic lower bound on the dmin when selecting codes from the 3D-TC ensemble uniformly at random. This comparison shows that the use of designed QPP interleavers can improve the dmin significantly. For instance, we have found a (6144,2040) 3D-TC with an estimated dmin of 147, while the probabilistic lower bound is 69. Higher rates are obtained by puncturing nonsystematic bits, and optimized periodic puncturing patterns for rates 1/2, 2/3, and 4/5 are found by computer search. Finally, we give iterative decoding thresholds, computed from an extrinsic information transfer chart analysis, and present simulation results on the additive white Gaussian noise channel to compare the error rate performance to that of conventional turbo codes.
description: To appear in IEEE Trans. Inf. Theory
Performance of the ATLAS Detector using First Collision Data
Creators: name: The ATLAS Collaboration
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: More than half a million minimum-bias events of LHC collision data were collected by the ATLAS experiment in December 2009 at centre-of-mass energies of 0.9 TeV and 2.36 TeV. This paper reports on studies of the initial performance of the ATLAS detector from these data. Comparisons between data and Monte Carlo predictions are shown for distributions of several track- and calorimeter-based quantities. The good performance of the ATLAS detector in these first data gives confidence for successful running at higher energies.
Driving the resonant quantum kicked rotor via extended initial conditions
Creators: name: Romanelli, Alejandro
name: Hernández, Guzmán
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences

description: We study the resonances of the quantum kicked rotor subjected to an extended initial distribution. For the primary resonances we obtain the dispersion relation for the map of this system. We find an analytical dependence of the statistical moments on the shape of the initial distribution. For the secondary resonances we obtain numerically a similar dependence. This allows us to devise an extended initial condition which produces an average angular momentum pointing in a preset direction which increases with time with a preset ratio.
description: 6 pages, 5 figures, send to EPJD
"COMMUNITY BASED HEALTH INSURANCE PRACTICE/ENROLLMENT AND CHALLENGES IN ETHIOPIA CASE OF OROMIYA REGIONAL STATE RURAL COMMUNITY OF ALELTU DISTRICT''.
Creators: name: Gutema Namomsa
Publisher: name: Zenodo
Year: 2017

description: This study examines the Community based health insurance Enrollment/practice & challenges in

Ethiopia by taking Aleltu district as case of study. The study, with the prime objectives of to find

out & mention the roots of problems & was geared towards answering key research questions

germane in enrollment of the CBHI in the Aleltu woreda.

Primary data have been collected from beneficiary’s (members) of CBHI by taking 150

respondents from five Gandas namely Maru, Mikawa, S/sageda, Ejersa & W/dera using

structured self-administer questioner. Three employees of CBHI were contacted for in-depth

interview & one manager of CBHI Finfine branch also has been contacted for triangulation

purpose. The data were putted in SPSS version 21 in order to get descriptive statistics or result.

The Qualitative data collected via in-depth interviews & open ended questions were analyzed

through transcription in to micro-soft word processing then by categorizing & coding on their

theme.
A stellar prominence in the white dwarf/red dwarf binary QS Vir: evidence for a detached system
Creators: name: Parsons, S. G.
name: Marsh, T. R.
name: Gänsicke, B. T.
name: Tappert, C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Using high resolution UVES spectra of the eclipsing Post Common Envelope Binary QS Vir we detect material along the line of sight to the white dwarf at orbital phase $ϕ=0.16$. We ascribe this to a stellar prominence originating from the M dwarf secondary star which passes in front of the white dwarf at this phase. This creates sharp absorption features in the hydrogen Balmer series and Ca II H and K lines. The small size of the white dwarf allows us to place tight constraints on the column density of hydrogen in the n=2 level of log_(10)(N_2) = 14.10 +/- 0.03 cm^(-2) and, assuming local thermodynamical equilibrium, the temperature of the prominence material of ~9000K. The prominence material is at least 1.5 stellar radii from the surface of the M dwarf. The location of the prominence is consistent with emission features previously interpreted as evidence for Roche lobe overflow in the system. We also detect Mg II 4481A absorption from the white dwarf. The width of the Mg II line indicates that the white dwarf is not rapidly rotating, in contrast to previous work, hence our data indicate that QS Vir is a pre-cataclysmic binary, yet to initiate mass transfer, rather than a hibernating cataclysmic variable as has been suggested.
description: Accepted for publication in MNRAS
Growing up in digital Europe : the first European-wide longitudinal study of children
Creators: name: Babarović, Toni
Publisher: name: Zenodo
Year: 2025

description: Presented at the Conference on Data Sharing and Secondary Analysis in Child and Youth Wellbeing Research, organised within the COORDINATE project, held in Zagreb from 9th to 10th December 2024. The main objective of the conference was to showcase existing efforts in secondary data analysis for research and policy development, and to discuss the benefits and challenges of data-sharing practices in the field of child and youth wellbeing.
title: Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÑÐ»Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÐµÐ¼ÐµÑÐµÐ½Ð¸ÐµÐ¼ Ð¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°ÑÐµÐ»Ñ Ð¸ Ð²Ð·Ð°Ð¸Ð¼Ð¾Ð´ÐµÐ¹ÑÑÐ²Ð¸ÐµÐ¼ ÐµÐ³Ð¾ ÑÐ¾ ÑÑÐµÐ´Ð¾Ð¹ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ ÑÑÐºÐ¸ Ð² Ð²Ð¸ÑÑÑÐ°Ð»ÑÐ½Ð¾Ð¹ ÑÐµÐ°Ð»ÑÐ½Ð¾ÑÑÐ¸
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
title: Development of programming module for controlling userâs movement and his interactions within virtual reality environment with hand movements
Creators: name: ÐÐ²ÑÑÐ½Ð½Ð¸ÐºÐ¾Ð², ÐÐ³Ð¾Ñ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: Ð²Ð¸ÑÑÑÐ°Ð»ÑÐ½Ð°Ñ ÑÐµÐ°Ð»ÑÐ½Ð¾ÑÑÑ
Ð¾ÑÑÐ»ÐµÐ¶Ð¸Ð²Ð°Ð½Ð¸Ðµ ÑÑÐº
Ð°Ð½Ð´ÑÐ¾Ð¸Ð´
unity
mediapipe
virtual reality
hand tracking
android

description: Ð¢ÐµÐ¼Ð° Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ: "Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½Ð¾Ð³Ð¾ Ð¼Ð¾Ð´ÑÐ»Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÐµÐ¼ÐµÑÐµÐ½Ð¸ÐµÐ¼ Ð¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°ÑÐµÐ»Ñ Ð¸ Ð²Ð·Ð°Ð¸Ð¼Ð¾Ð´ÐµÐ¹ÑÑÐ²Ð¸ÐµÐ¼ ÐµÐ³Ð¾ ÑÐ¾ ÑÑÐµÐ´Ð¾Ð¹ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ ÑÑÐºÐ¸ Ð² Ð²Ð¸ÑÑÑÐ°Ð»ÑÐ½Ð¾Ð¹ ÑÐµÐ°Ð»ÑÐ½Ð¾ÑÑÐ¸" Ð¦ÐµÐ»ÑÑ ÑÐ°Ð±Ð¾ÑÑ ÑÐ²Ð»ÑÐµÑÑÑ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ð¸ Ð²Ð¸ÑÑÑÐ°Ð»ÑÐ½Ð¾Ð¹ ÑÐµÐ°Ð»ÑÐ½Ð¾ÑÑÐ¸, ÑÑÐµÐ´ÑÑÐ² Ð¾ÑÑÐ»ÐµÐ¶Ð¸Ð²Ð°Ð½Ð¸Ñ ÑÑÐºÐ¸. ÐÑÐ±Ð¾Ñ Ð´Ð¾ÑÑÑÐ¿Ð½ÑÑ ÑÑÐµÐ´ÑÑÐ² Ð¸ ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐºÐ° Unity ÐÐ  Ð¿ÑÐ¾ÐµÐºÑÐ° Ñ Ð¾Ð¿ÑÐµÐ´ÐµÐ»ÐµÐ½Ð¸ÐµÐ¼ ÑÑÐºÐ¸ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ Ð²ÑÐ±ÑÐ°Ð½Ð½Ð¾Ð³Ð¾ ÑÑÐµÐ´ÑÑÐ²Ð°, Ð¸Ð½ÑÐµÐ³ÑÐ°ÑÐ¸Ñ ÑÐ¾Ð·Ð´Ð°Ð½Ð½Ð¾Ð³Ð¾ Ð¿ÑÐ¾ÐµÐºÑÐ° Ñ Ð¿ÑÐ¾Ð³ÑÐ°Ð¼Ð¼Ð½ÑÐ¼ Ð¿ÑÐ¸Ð»Ð¾Ð¶ÐµÐ½Ð¸ÐµÐ¼ Ð´Ð»Ñ ÐºÑÑÑÐ° Â«Ð¦Ð¸ÑÑÐ¾Ð²Ð°Ñ Ð³ÑÐ°Ð¼Ð¾ÑÐ½Ð¾ÑÑÑÂ». Ð ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐµ Ð±ÑÐ» ÑÐ¾Ð·Ð´Ð°Ð½ Ð¼Ð¾Ð´ÑÐ»Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÐµÐ¼ÐµÑÐµÐ½Ð¸ÐµÐ¼ Ð¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°ÑÐµÐ»Ñ Ð² ÑÑÐµÐ´Ðµ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ ÑÑÐºÐ¸, Ð¸ Ð´Ð°Ð½Ð½ÑÐ¹ Ð¼Ð¾Ð´ÑÐ»Ñ Ð±ÑÐ» Ð¸Ð½ÑÐµÐ³ÑÐ¸ÑÐ¾Ð²Ð°Ð½ Ñ Ð¿ÑÐ¸Ð»Ð¾Ð¶ÐµÐ½Ð¸ÐµÐ¼ Ð´Ð»Ñ ÐºÑÑÑÐ° Â«Ð¦Ð¸ÑÑÐ¾Ð²Ð°Ñ Ð³ÑÐ°Ð¼Ð¾ÑÐ½Ð¾ÑÑÑÂ».
description: The topic of this final graduate project is "Development of programming module for controlling userâs movement and his interactions within virtual reality environment with hand movements" The goal of this work is to research virtual reality technology, hand tracking technology. Choose the most suitable and available method and to develop Unity VR project with hand tracking. Then implement the developed module in the app from "Digital literacy" course. As a result of this work the module for controlling userâs movement and interaction within virtual reality was made and implemented in the app from "Digital literacy" course.
Detection of gravitational-wave bursts with chirplet-like template families
Creators: name: Chassande-Mottin, Eric
name: Miele, Miriam
name: Mohapatra, Satya
name: Cadonati, Laura
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Gravitational Wave (GW) burst detection algorithms typically rely on the hypothesis that the burst signal is "locally stationary", that is it changes slowly with frequency. Under this assumption, the signal can be decomposed into a small number of wavelets with constant frequency. This justifies the use of a family of sine-Gaussian templates in the Omega pipeline, one of the algorithms used in LIGO-Virgo burst searches. However there are plausible scenarios where the burst frequency evolves rapidly, such as in the merger phase of a binary black hole and/or neutron star coalescence. In those cases, the local stationarity of sine-Gaussians induces performance losses, due to the mismatch between the template and the actual signal. We propose an extension of the Omega pipeline based on chirplet-like templates. Chirplets incorporate an additional parameter, the chirp rate, to control the frequency variation. In this paper, we show that the Omega pipeline can easily be extended to include a chirplet template bank. We illustrate the method on a simulated data set, with a family of phenomenological binary black-hole coalescence waveforms embedded into Gaussian LIGO/Virgo-like noise. Chirplet-like templates result in an enhancement of the measured signal-to-noise ratio.
description: 8 pages, 6 figures. Submitted to Class. Quantum Grav. Special issue: Proceedings of GWDAW-14, Rome (Italy), 2010; fixed several minor issues
title: DEPRECATED: Mitochondrial Involvement in Pancreatic Beta Cell Glucolipotoxicity
Creators: name: Barlow, Jonathan
Publisher: name: Plymouth University
Year: 2015
Subjects: Glucolipotoxicity
Type 2 diabetes
Pancreatic beta cells
Uncoupling protein 2
Reactive oxygen species
Mitochondria
Bioenergetics

description: High circulating glucose and non-esterified free fatty acid (NEFA) levels can cause pancreatic β-cell failure. The molecular mechanisms of this β-cell glucolipotoxicity are yet to be established conclusively. In this thesis by exploring mitochondrial energy metabolism in INS-1E insulinoma cells and isolated pancreatic islets, a role of mitochondria in pancreatic β-cell glucolipotoxicity is uncovered. It is reported that prolonged palmitate exposure at high glucose attenuates glucose-stimulated mitochondrial respiration which is coupled to ADP phosphorylation. These mitochondrial defects coincide with an increased level of mitochondrial reactive oxygen species (ROS), impaired glucose-stimulated insulin secretion (GSIS) and decreased cell viability. Palmitoleate, on the other hand, does not affect mitochondrial ROS levels or cell viability and protects against the adverse effects of palmitate on these phenotypes. Interestingly, palmitoleate does not significantly protect against mitochondrial respiratory or insulin secretion defects and in pancreatic islets tends to limit these functions on its own. Furthermore, strong evidence suggests that glucolipotoxic-induced ROS are of a mitochondrial origin and these ROS are somehow linked with NEFA-induced loss in cell viability. To explore the mechanism of glucolipotxic-induced mitochondrial ROS and associated cell loss, uncoupling protein-2 (UCP2) protein levels and activity were probed in NEFA exposed INS-1E cells. It is concluded that UCP2 neither mediates palmitate-induced mitochondrial ROS production and the related cell loss, nor protects against these deleterious effects. Instead, UCP2 dampens palmitoleate protection against palmitate toxicity. Collectively, these data shed important new light on the area of glucolipotoxicity in pancreatic β-cells and provide novel insights into the pathogenesis of Type 2 diabetes.
Recommender Systems by means of Information Retrieval
Creators: name: Costa, Alberto
name: Roda, Fabio
Publisher: name: arXiv
Year: 2010
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: In this paper we present a method for reformulating the Recommender Systems problem in an Information Retrieval one. In our tests we have a dataset of users who give ratings for some movies; we hide some values from the dataset, and we try to predict them again using its remaining portion (the so-called "leave-n-out approach"). In order to use an Information Retrieval algorithm, we reformulate this Recommender Systems problem in this way: a user corresponds to a document, a movie corresponds to a term, the active user (whose rating we want to predict) plays the role of the query, and the ratings are used as weigths, in place of the weighting schema of the original IR algorithm. The output is the ranking list of the documents ("users") relevant for the query ("active user"). We use the ratings of these users, weighted according to the rank, to predict the rating of the active user. We carry out the comparison by means of a typical metric, namely the accuracy of the predictions returned by the algorithm, and we compare this to the real ratings from users. In our first tests, we use two different Information Retrieval algorithms: LSPR, a recently proposed model based on Discrete Fourier Transform, and a simple vector space model.
Dynamic simulations of multicomponent lipid membranes over long length and time scales
Creators: name: Camley, Brian A.
name: Brown, Frank L. H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We present a stochastic phase-field model for multicomponent lipid bilayers that explicitly accounts for the quasi-two-dimensional hydrodynamic environment unique to a thin fluid membrane immersed in aqueous solution. Dynamics over a wide range of length scales (from nanometers to microns) for durations up to seconds and longer are readily accessed and provide a direct comparison to fluorescence microscopy measurements in ternary lipid/cholesterol mixtures. Simulations of phase separation kinetics agree with experiment and elucidate the importance of hydrodynamics in the coarsening process.
title: Journal of Preventive Medicine and Hygiene, Vol 60, No 1 (2019): 2019601
title: 2019601
titleType: AlternativeTitle
Creators: name: Department Of Health Science-University Of Genoa
Publisher: name: Department of Health Science - University of Genoa
Year: 2019

description: High prevalence of fluoroquinolone-resistant Escherichia coli strains isolated from urine clinical samples...E25
Improvement of hand hygiene compliance among health care workers in intensive care units...E31
A Survey of Social Cognitive Determinants of Physical Activity among Iranian Women Using Path Analysis Method...E43
Smoke-free environment policy in Vietnam: What did people see and how did they react when they visited various public places?...E36
Uncompleted Emergency Department Care (UEDC): a 5-year population-based study in Veneto Region, Italy....E18
Skin Safety and Health Prevention: an Overview of Chemicals in Cosmetic Products...E50
IMPACT ASSESSMENT OF AN EDUCATION COURSE ON VACCINATIONS IN A POPULATION OF PREGNANT WOMEN...E5
Vaccination coverage in healthcare workers: a multicenter cross-sectional study in Italy...E12
Training to improve resilience and coping to monitor PTSD in rescue workers...E58
Anti-rabies vaccination between the 18th and 19th centuries and its pioneer Eusebio Giacinto Valli (1755-1816)...E68
The Spanish Influenza Pandemic: a lesson from the history 100 years after 1918...E64
Detection of influenza A(H1N1)pdm09 virus in a patient travelling from Shanghai to Italy in July 2018: an uncommon clinical presentation in a non-seasonal period...E1
The development and application of new computational tools for working with viral metagenomic data
Creators: name: Kitson, Ezra
Publisher: name: University of British Columbia
Year: 2019

description: Next generation, high throughput sequencing has revolutionised the way in which we are able to view the microbial world. We have now generated a large volume of metagenomic sequence data describing viruses and bacteria in diverse environments across the planet. These data require computational processing in order to be used in further analysis. Manipulating the data in the way a bioinformatician wants is often a major difficulty in a metagenomic research. There are two reasons for this. One is that, as the field is nascent, there are many useful data processing tasks that do not yet have published computational tools. A second is that the computational tools that have been published to date are often poorly documented and complicated making them difficult to use in a routine application. Research in this thesis focusses on developing simple computational tools for managing viral metagenomic data. Viral metagenomic data presents the bioinformatician with specific difficulties owing to its size, poor quality and largely novel sequence content. Four new computational tools for managing viral metagenomic data are presented and benchmarked here. Three of these tools expedite everyday researching tasks, automating a process that would otherwise be done manually. The fourth, VHost-Classifier, allows a new scientific question to be asked using viral metagenomic data. In the final chapter VHost-Classifier is applied to analyse viruses published in the NCBI taxonomy database by host organism. The results reveal a large anthropocentric bias in viral sequencing.
Promoting ethics for human enhancement technologies: SIENNA project Policy Brief #5
Creators: name: Erden, Yasemin J.
name: Brey, Philip
Publisher: name: Zenodo
Year: 2021
Subjects: human enhancement
recommendations
ethics guidance
regulatory guidance

description: Human enhancement is a modification aimed at improving human performance beyond what is typical or average, brought about
 by science-based and/or technology-based interventions in or on the human body. Some forms of human enhancement (e.g., cosmetic surgery, doping in sports), have existed for a long time. Recent developments in science promise substantial advancements. Developments in genomics, pharmaceutics, prosthetics, neurotechnology, biomedical engineering, human-machine interaction, artificial intelligence and nanomedicine have unlimited potential to create future humans with superhuman physical and mental abilities. Some human enhancement is controversial socially and morally. They promise the advancement of humanity, but also introduce serious risks to health and well-being, freedom, and equality. Human enhancement research and development can be missed in ethical and legislative review. The field is broad, and enhancement potential can be difficult to predict, especially if such potential is not actively sought. In all cases, guidance is needed. SIENNA research has identified that there is insufficient guidance available for responsible decision-making on these topics, whether in research, development, deployment or use of technologies with enhancement potential. This brief presents some urgent actions and recommendations for policy makers.
IMPACT ASSESSMENT OF AN EDUCATION COURSE ON VACCINATIONS IN A POPULATION OF PREGNANT WOMEN
Creators: name: Bechini, Angela
name: Moscadelli, Andrea
name: Pieralli, Francesca
name: Sartor, Gino
name: Seravalli, Viola
name: Panatto, Donatella
name: Amicizia, Daniela
name: Bonanni, Paolo
name: Boccalini, Sara
Publisher: name: Department of Health Science - University of Genoa
Year: 2019
Subjects: vaccine - pregnancy - education - hesitancy - attitude

description: Background

Although benefits of vaccinations have been extensively demonstrated, poor knowledge of the population has resulted in non-optimal vaccine coverage as a result of the hesitancy and negative perception of many parents toward vaccination.

Materials and Methods

To assess the impact of a course on the knowledge and attitudes of future mothers on vaccination, 214 pregnant women participated in a research project undertaken at the Obstetrics and Gynaecology Department of the Careggi University Hospital in Florence (Italy). This involved completion of anonymous questionnaires administered before and after the intervention. A descriptive and statistical analysis was carried out on the results of the collected data by performing comparative evaluations of the responses obtained before and after the intervention.

Results

There was good adherence to the initiative (98%): the sample population was initially not hostile to vaccines, albeit poorly or insufficiently informed (43%). The educational intervention had a positive impact, especially as a vaccine information tool and for correctly addressing the vaccine hesitancy. After the intervention, women who considered their level of knowledge about vaccines as poor or insufficient were reduced by 30% and the "hesitant" ones were reduced with respect to all aspects of the study, especially about the decision to be vaccinated during pregnancy.

Conclusions

Hesitancy finds its roots in the absence of accurate information. Healthcare professionals need to improve their communication skills. Competent education delivered during pregnancy, when women are more receptive, may have a highly positive impact. These observations will have to be considered in the planning of delivery preparation courses.
description: Journal of Preventive Medicine and Hygiene, Vol 60, No 1 (2019): 2019601
The Spanish Influenza Pandemic: a lesson from the history 100 years after 1918
Creators: name: Martini, Mariano
name: Gazzaniga, Valentina
name: Bragazzi, Nicola Luigi
name: Barberis, Ilaria
Publisher: name: Department of Health Science - University of Genoa
Year: 2019

description: In Europe the influence spread in France, Great Britain, Italy and Spain, interfering on the battle-fields with the military operations during the First World War.

The official communications of the health authorities worldwide gave certainty about the etiology of influenza, but from laboratories it was not always possible to isolate the famous Pfiffer bacillus.

The Spanish flu hit different ages with a so-called “W- trend”: the two typically more susceptible age spikes were the children and the elderly,  added by the healthy young adults.

The first official preventive measures implemented in August 1918 included the notification need of suspected cases, and the surveillance of communities such as schools, barracks and boarding schools.

The identification of the ill through surveillance, voluntary and legally enforced quarantine, or isolation had also permitted to limit Sanish flu widespread.

In order to not impress the public opinion, moreover, several hygiene local offices refused to provide the numbers of people affected and deads.

The influenza pandemic of 1918 killed more than 50 million people worldwide.

Virological and bacteriological analysis of preserved samples of infected soldiers who died in 1918 during the pandemic period is a main step in order to better understand and prepare to future pandemics.
description: Journal of Preventive Medicine and Hygiene, Vol 60, No 1 (2019): 2019601
New Results on Bottom Baryons with the CDF II Detector
Creators: name: Calancha, Constantino
name: Gorelov, Igor V.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We present measurements of the masses and widths of four bottom baryon resonances, Sigma_b(*)+-, reconstructed in the Lambda_b pi+- hadron decay modes. The isospin mass splittings for the Sigma_b and Sigma_b* multiplets are extracted as well. The analysis is based on a data sample corresponding to an integrated luminosity of 6 fb^-1 .
description: 5 pages, 3 figures, 1 table; talk presented on behalf of CDF Collaboration at ICHEP 2010, Paris, 22-28 July 2010
General Non-minimal Kinetic coupling to gravity
Creators: name: Granda, L. N.
name: Cardona, W.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We study a new model of scalar field with a general non-minimal kinetic coupling to itself and to the curvature, as a source of dark energy, and analyze the cosmological dynamics of this model and the issue of accelerated expansion. A wide variety of scalar fields and potentials giving rise to power-law expansion have been found. The dynamical equation of state is studied for the two cases, without and with free kinetic term . In the first case, a behavior very close to that of the cosmological constant was found. In the second case, a solution was found, which match the current phenomenology of the dark energy. The model shows a rich variety of dynamical scenarios.
description: 25 pages, 3 figures; figure added, references added
An Introduction to the Chandra Carina Complex Project
Creators: name: Townsley, Leisa K.
name: Broos, Patrick S.
name: Corcoran, Michael F.
name: Feigelson, Eric D.
name: Gagné, Marc
name: Montmerle, Thierry
name: Oey, M. S.
name: Smith, Nathan
name: Garmire, Gordon P.
name: Getman, Konstantin V.
name: Povich, Matthew S.
name: Evans, Nancy Remage
name: Nazé, Yaël
name: Parkin, E. R.
name: Preibisch, Thomas
name: Wang, Junfeng
name: Wolk, Scott J.
name: Chu, You-Hua
name: Cohen, David H.
name: Gruendl, Robert A.
name: Hamaguchi, Kenji
name: King, Robert R.
name: Mac Low, Mordecai-Mark
name: McCaughrean, Mark J.
name: Moffat, Anthony F. J.
name: Oskinova, L. M.
name: Pittard, Julian M.
name: Stassun, Keivan G.
name: ud-Doula, Asif
name: Walborn, Nolan R.
name: Waldron, Wayne L.
name: Churchwell, Ed
name: Nichols, J. S.
name: Owocki, Stanley P.
name: Schulz, N. S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Great Nebula in Carina provides an exceptional view into the violent massive star formation and feedback that typifies giant HII regions and starburst galaxies. We have mapped the Carina star-forming complex in X-rays, using archival Chandra data and a mosaic of 20 new 60ks pointings using the Chandra X-ray Observatory's Advanced CCD Imaging Spectrometer, as a testbed for understanding recent and ongoing star formation and to probe Carina's regions of bright diffuse X-ray emission. This study has yielded a catalog of properties of >14,000 X-ray point sources; >9800 of them have multiwavelength counterparts. Using Chandra's unsurpassed X-ray spatial resolution, we have separated these point sources from the extensive, spatially-complex diffuse emission that pervades the region; X-ray properties of this diffuse emission suggest that it traces feedback from Carina's massive stars. In this introductory paper, we motivate the survey design, describe the Chandra observations, and present some simple results, providing a foundation for the 15 papers that follow in this Special Issue and that present detailed catalogs, methods, and science results.
description: Accepted for the ApJS Special Issue on the Chandra Carina Complex Project (CCCP), scheduled for publication in May 2011. All 16 CCCP Special Issue papers are available at http://cochise.astro.psu.edu/Carina_public/special_issue.html through 2011 at least. 43 pages; 18 figures
Detection of influenza A(H1N1)pdm09 virus in a patient travelling from Shanghai to Italy in July 2018: an uncommon clinical presentation in a non-seasonal period
Creators: name: Butera, Francesca
name: Schenone, Sara
name: Grammatico, Federico
name: Tisa, Valentino
name: Barisione, Gaia
name: Guarona, Giulia
name: Bruzzone, Bianca
name: Murdaca, Giuseppe
name: Setti, Maurizio
name: Orsi, Andrea
Publisher: name: Department of Health Science - University of Genoa
Year: 2019

description: Influenza is one of the most common infectious diseases in travellers, especially in those returning from subtropical and tropical regions.
In late June 2018 an influenza A(H1N1)pdm09 virus infection was diagnosed in a 36-years-old man, returned from a travel in Shanghai and hospitalized at the Ospedale Policlinico San Martino, Genoa, Italy, with a diagnosis of fever and an uncommon clinical presentation characterised by a persistent leukopenia. Phylogenetic analysis revealed a closeness with influenza A(H1N1)pdm09 strains circulating in the US in May-June 2018.
Prompt recognition of influenza infection led to a proper case management, demonstrating the crucial role of the continuous influenza surveillance programme.
description: Journal of Preventive Medicine and Hygiene, Vol 60, No 1 (2019): 2019601
Catastrophe optics of caustics in single and bilayer graphene: fine structure of caustics
Creators: name: Péterfalvi, Csaba
name: Pályi, András
name: Rusznyák, Ádám
name: Koltai, János
name: Cserti, József
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We theoretically study the scattering of a plane wave of a ballistic electron on a circular n-p junction in single and bilayer graphene. We compare the exact wave function inside the junction to that obtained from a semiclassical formula developed in catastrophe optics. In the semiclassical picture short-wavelength electrons are treated as rays of particles that can get reflected and refracted at the n-p junction according to Snell's law with negative refraction index. We show that for short wavelength and close to caustics this semiclassical approximation gives good agreement with the exact results in the case of single-layer graphene. We also verify the universal scaling laws that govern the shrinking rate and intensity divergence of caustics in the semiclassical limit. It is straightforward to generalize our semiclassical method to more complex geometries, offering a way to efficiently design and model graphene-based electron-optical systems.
description: 4 pages, 5 figures This manuscript should be published in the proceedings volume of the conference IWEPNM 2010, in the Physica Status Solidi B
Uranium at High Pressure from First Principles
Creators: name: Adak, S.
name: Nakotte, H.
name: de Châtel, P. F.
name: Kiefer, B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The equation of state, structural behavior and phase stability of α-uranium have been investigated up to 1.3 TPa using density functional theory, adopting a simple description of electronic structure that neglects the spin-orbit coupling and strong electronic correlations. The comparison of the enthalpies of Cmcm (alpha-U), bcc, hcp, fcc, and bct predicts that the aplpha-U phase is stable up to a pressure of ~285 GPa, above which it transforms to a bct-U phase. The enthalpy differences between the bct and bcc phase decrease with pressure, but bcc is energetically unfavorable at least up to 1.3 TPa, the upper pressure limit of this study. The enthalpies of the close-packed hcp and fcc phases are 0.7 eV and 1.0 eV higher than that of the stable bct-U phase at a pressure of 1.3 TPa, supporting the wide stability field of the bcc phase. The equation of state, the lattice parameters and the anisotropic compression parameters are in good agreement with experiment up 100 GPa and previous theory. The elastic constants at the equilibrium volume of alpha-U confirm our bulk modulus. This suggests that our simplified description of electronic structure of uranium captures the relevant physics and may be used to describe bonding and other light actinides that show itinerant electronic behavior especially at high pressure.
description: 19 pages, 3 tables, 6 figures. Submitted for publication (2011)
title: ÐÑÐ¾Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ðµ ÐºÐ¸ÑÐ°Ð¹ÑÐºÐ¾Ð¹ ÐºÑÐ»Ð¸Ð½Ð°ÑÐ½Ð¾Ð¹ ÑÑÐ°Ð´Ð¸ÑÐ¸Ð¸ Ð² ÑÐµÑÐ¸ ÑÐµÑÑÐ¾ÑÐ°Ð½Ð¾Ð² Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³Ð° Ð¸ Ð£ÑÑ (Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ ÐÐÐ Â«ÐÐµÐ»Ð¸ÐºÐ°Ñ ÑÑÐµÐ½Ð°Â»)
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
title: Promotion of the Chinese culinary tradition in the chain of restaurants in St. Petersburg and Ufa (on the example of Great Wall LLC)
Creators: name: ÐÑ ÐÑÐ½ÑÐ¸
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2021
Subjects: Ð¼Ð°ÑÐºÐµÑÐ¸Ð½Ð³Ð¾Ð²Ð°Ñ ÑÑÑÐ°ÑÐµÐ³Ð¸Ñ
ÐºÐ¾Ð¼Ð¼ÑÐ½Ð¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÑÑÐ°ÑÐµÐ³Ð¸Ñ
ÑÐµÐºÐ»Ð°Ð¼Ð° Ð¸ PR
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description: Ð Ð¿ÐµÑÐ²Ð¾Ð¼ ÑÐ°Ð·Ð´ÐµÐ»Ðµ Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ Ð±ÑÐ» ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½ PR Ð² Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð¼ÐµÐ¶ÐºÑÐ»ÑÑÑÑÐ½ÑÑ Ð¾ÑÐ½Ð¾ÑÐµÐ½Ð¸Ð¹. ÐÐ¾ Ð²ÑÐ¾ÑÐ¾Ð¼ ÑÐ°Ð·Ð´ÐµÐ»Ðµ Ð±ÑÐ» Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½ Ð°Ð½Ð°Ð»Ð¸Ð· Ñ ÑÐµÐ»ÑÑ Ð²ÑÑÐ²Ð»ÐµÐ½Ð¸Ñ Ð¾ÑÐ¾Ð±ÐµÐ½Ð½Ð¾ÑÑÐµÐ¹ Ð¿ÑÐ¾Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ ÐºÐ¸ÑÐ°Ð¹ÑÐºÐ¾Ð¹ ÐºÑÐ»ÑÑÑÑÑ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ ÑÐµÑÑÐ¾ÑÐ°Ð½Ð¾Ð² ÐºÐ¸ÑÐ°Ð¹ÑÐºÐ¾Ð¹ ÐºÑÑÐ½Ð¸ Ð² Ð³. Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ Ð¸ Ð² Ð³. Ð£ÑÐµ. ÐÐ¾ÑÐ»Ðµ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° Ð±ÑÐ»Ð° Ð²ÑÑÐ²Ð»ÐµÐ½Ð° Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼Ð° â Ð¼Ð½Ð¾Ð³Ð¸Ðµ ÐºÐ¸ÑÐ°Ð¹ÑÐºÐ¸Ðµ ÑÐµÑÑÐ¾ÑÐ°Ð½Ñ Ð½Ðµ Ð¿ÑÐ¾Ð´Ð²Ð¸Ð³Ð°ÑÑ ÑÐ¾Ð±ÑÑÐ²ÐµÐ½Ð½ÑÑ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÑ Ð² Ð¾Ð½Ð»Ð°Ð¹Ð½-ÑÑÐµÐ´Ðµ. Ð ÑÑÐµÑÑÐµÐ¼ ÑÐ°Ð·Ð´ÐµÐ»Ðµ Ð±ÑÐ» ÑÐ°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½ Ð¿ÑÐ¾ÐµÐºÑ Ð¿Ð¾ Ð¿ÑÐ¾Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ ÐºÐ¸ÑÐ°Ð¹ÑÐºÐ¾Ð³Ð¾ ÑÐµÑÑÐ¾ÑÐ°Ð½Ð° Â«ÐÐµÐ»Ð¸ÐºÐ°Ñ ÑÑÐµÐ½Ð°Â». Ð ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐµ ÑÐ°Ð±Ð¾ÑÑ Ð±ÑÐ»Ð¸ ÑÑÐ¾ÑÐ¼ÑÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ñ ÑÐµÐºÐ¾Ð¼ÐµÐ½Ð´Ð°ÑÐ¸Ð¸ Ð¿Ð¾ Ð¿ÑÐ¾Ð´Ð²Ð¸Ð¶ÐµÐ½Ð¸Ñ, Ð¾Ð¿Ð¸ÑÐ°Ð½Ð° ÑÐµÑÐ½Ð¾Ð»Ð¾Ð³Ð¸Ñ Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð¸Ñ ÐºÐ¾Ð¼Ð¼ÑÐ½Ð¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÑÑÐ°ÑÐµÐ³Ð¸Ð¸ Ð¸ Ð¿ÑÐ¾Ð²ÐµÐ´ÐµÐ½Ð° Ð¾ÑÐµÐ½ÐºÐ° ÐµÐµ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸.
description: In the first section of this work, PR in the activities of intercultural relations was considered. In the second section, an analysis was carried out in order to identify the features of the promotion of Chinese culture with the help of Chinese restaurants in St. Petersburg and Ufa. After the analysis, a problem was identified - many Chinese restaurants do not promote their own activities in the online environment. In the third section, a project to promote the Great Wall Chinese restaurant was developed. As a result of the work, recommendations were formulated to promote the Chinese culinary tradition, the technology for conducting a communication strategy was described and its communicative effectiveness was assessed.
Strong lensing of gravitational waves as seen by LISA
Creators: name: Sereno, M.
name: Sesana, A.
name: Bleuler, A.
name: Jetzer, Ph.
name: Volonteri, M.
name: Begelman, M. C.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss strong gravitational lensing of gravitational waves from merging of massive black hole binaries in the context of the LISA mission. Detection of multiple events would provide invaluable information on competing theories of gravity, evolution and formation of structures and, with complementary observations, constraints on H_0 and other cosmological parameters. Most of the optical depth for lensing is provided by intervening massive galactic halos, for which wave optics effects are negligible. Probabilities to observe multiple events are sizable for a broad range of formation histories. For the most optimistic models, up to 4 multiple events with a signal to noise ratio >= 8 are expected in a 5-year mission. Chances are significant even for conservative models with either light (<= 60%) or heavy (<= 40%) seeds. Due to lensing amplification, some intrinsically too faint signals are brought over threshold (<= 2 per year).
description: 4 pages, 6 figures, in press on Phys. Rev. Lett
Exponential moments of first passage times and related quantities for random walks
Creators: name: Iksanov, Alexander
name: Meiners, Matthias
Publisher: name: arXiv
Year: 2010
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60K05 (Primary), 14F05, 60G40 (Secondary)

description: For a zero-delayed random walk on the real line, let $τ(x)$, $N(x)$ and $ρ(x)$ denote the first passage time into the interval $(x,\infty)$, the number of visits to the interval $(-\infty,x]$ and the last exit time from $(-\infty,x]$, respectively. In the present paper, we provide ultimate criteria for the finiteness of exponential moments of these quantities. Moreover, whenever these moments are finite, we derive their asymptotic behaviour, as $x \to \infty$.
Warm Cores around Regions of Low-Mass Star Formation
Creators: name: Awad, Zainab
name: Viti, Serena
name: Collings, Mark P.
name: Williams, David A.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Warm cores (or hot corinos) around low-mass protostellar objects show a rich chemistry with strong spatial variations. This chemistry is generally attributed to the sublimation of icy mantles on dust grains initiated by the warming effect of the stellar radiation. We have used a model of the chemistry in warm cores in which the sublimation process is based on extensive laboratory data; these data indicate that sublimation from mixed ices occurs in several well-defined temperature bands. We have determined the position of these bands for the slow warming by a solar-mass star. The resulting chemistry is dominated by the sublimation process and by subsequent gas-phase reactions; strong spatial and temporal variations in certain molecular species are found to occur, and our results are, in general, consistent with observational results for the well-studied source IRAS 16293-2422. The model used is similar to one that describes the chemistry of hot cores. We infer that the chemistry of both hot cores and warm cores may be described by the same model (suitably adjusted for different physical parameters).
description: 11 pages, 5 figures, 2 tables. Accepted by MNRAS
Qualitatively Different Theoretical Predictions for Strong-Field Photoionization Rates
Creators: name: Bauer, J. H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We give examples showing that two well-known versions of the S-matrix theory, which describes a nonresonant multiphoton ionization of atoms and ions in intense laser fields, lead to qualitatively different results. The latter refer not only to total ionization rates, but also to energy distributions of photoelectrons, for instance in a polarization plane of the laser field. It should be possible to make an experiment testing predictions of both theories in the near future.
description: 12 pages, 5 figures; submitted to Physical Review
Uncompleted Emergency Department Care (UEDC): a 5-year population-based study in Veneto Region, Italy.
Creators: name: Buja, Alessandra
name: Saia, Mario
name: Fusinato, Riccardo
name: Fonzo, Marco
name: Bertoncello, Chiara
name: Baldo, Vincenzo
Publisher: name: Department of Health Science - University of Genoa
Year: 2019
Subjects: Emergency Department Care; health care services

description: Introduction: Uncompleted visits in the emergency department (UEDC) are a patient safety concern. The purpose of this study was to further investigate risk factors for UEDC, describing socio-demographic characteristics but also access and hospital characteristics both of those left AMA and those who LWBS.

 Methods: this was a retrospective case–control study on administrative anonymous data using a population-based emergency department database.

Results: overall, 9,147,415 patients attended the EDs of Veneto Region from 2011 to 2015. Rate of UEDC was 28,7‰, composed by slightly higher rate of AMA compared to LWBS (15,3‰ Vs 13,4‰). Age, sex, citizenship, residence are sociodemographic factors associated with UEDC and also the characteristics of access as admission mode, the type of referring, the emergency level, waiting time of visit and the type of complaint, finally also the characteristics of the structure as type and volume of hospital could be associate with UEDC.

Conclusion: Patients with Uncompleted Emergency Department Care both those who leave AMA and LWBS greatly differs from other not UEDC.  These results are important for planning and staffing health services. Decision makers should identify and target factors to minimise walkouts from public hospital emergency departments.
description: Journal of Preventive Medicine and Hygiene, Vol 60, No 1 (2019): 2019601
Rheology and dye adsorption of surfactant-cellulose nanocrystal complexes
Creators: name: Ranjbar, Damoon
Publisher: name: University of British Columbia
Year: 2019

description: The adaptability of Cellulose Nanocrystal (CNC) with reference to two of its major applications, namely viscosity modification in complex fluids and dye adsorption, is investigated. In the context of viscosity enhancement, the interaction of CNCs with two ionic surfactants, namely sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB), has been explored in this study. The effect of CTAB and SDS on surface charge of CNCs is analyzed and coupled with the rheological properties in order to investigate the mechanisms in CNC/surfactant and CNC/CNC interactions. It was found that both surfactants result in gelation of chiral nematic CNC suspensions by setting the stage for establishment of crosslinks between individual CNCs. In the case of CTAB, a gradual increase in the viscoelastic moduli was observed with the concentration of surfactant implying the induction of dominant attractive forces between CNCs by surfactant molecules. However, the presence of SDS results in the emergence of both attractive and repulsive forces whose dominance controls the viscoelastic properties. In the context of dye adsorption, a CNC based adsorbent was first synthesized by modifying the pristine CNC with various amounts of CTAB and consequently was used to study the adsorption behavior of Congo red (CR) in aqueous medium. The interaction of CTAB with CNC, and potential alterations on the chemical and physical structure of CNC was studied. The synthesized adsorbent, a modified cellulose nanocrystal (MCNC), was characterized using Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and zeta potential analysis. The amount of surfactant used for modification exhibited an optimum at which the adsorption capacity was shown a weak maximum. Furthermore, it was found that the amount of surfactant affects the CR-MCNC interactions and determines the mechanisms of adsorption. Characterization of the adsorbent, before and after adsorption, coupled with kinetics and isotherm studies implied electrostatic attraction, hydrogen bonding, and hydrophobic attraction as the main mechanisms of adsorption. Thermodynamic studies on the system suggested that the adsorption process is spontaneous and exothermic. Finally, stability analysis in aqueous environment revealed that the adsorbent is highly stable and retains its original adsorption capacity after successive dialysis cycles.
A Unified Interpretation of Stress in Molecular Systems
Creators: name: Admal, Nikhil Chandra
name: Tadmor, Ellad B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Mathematical Physics (math-ph)
subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The microscopic definition for the Cauchy stress tensor has been examined in the past from many different perspectives. This has led to different expressions for the stress tensor and consequently the "correct" definition has been a subject of debate and controversy. In this work, a unified framework is set up in which all existing definitions can be derived, thus establishing the connections between them. The framework is based on the non-equilibrium statistical mechanics procedure introduced by Irving, Kirkwood and Noll, followed by spatial averaging. The Irving--Kirkwood--Noll procedure is extended to multi-body potentials with continuously differentiable extensions and generalized to non-straight bonds, which may be important for particles with internal structure. Connections between this approach and the direct spatial averaging approach of Murdoch and Hardy are discussed and the Murdoch--Hardy procedure is systematized. Possible sources of non-uniqueness of the stress tensor, resulting separately from both procedures, are identified and addressed. Numerical experiments using molecular dynamics and lattice statics are conducted to examine the behavior of the resulting stress definitions including their convergence with the spatial averaging domain size and their symmetry properties.
description: 86 pages
Open charm meson in nuclear matter at finite temperature beyond the zero range approximation
Creators: name: Jiménez-Tejero, C. E.
name: Ramos, A.
name: Tolós, L.
name: Vidaña, I.
Publisher: name: arXiv
Year: 2011
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: The properties of open charm mesons, $D$, $\bar D$, $D_s$ and $\bar D_s$ in nuclear matter at finite temperature are studied within a self-consistent coupled-channel approach. The interaction of the low lying pseudoscalar mesons with the ground state baryons in the charm sector is derived from a $t$-channel vector-exchange model. The in-medium scattering amplitudes are obtained by solving the Lippmann-Schwinger equation at finite temperature including Pauli blocking effects, as well as $D$, $\bar D$, $D_s$ and $\bar D_s$ self-energies taking their mutual influence into account. We find that the in-medium properties of the $D$ meson are affected by the $D_s$-meson self-energy through the intermediate $D_s Y$ loops coupled to $DN$ states. Similarly, dressing the $\bar{D}$ meson in the $\bar{D}Y$ loops has an influence over the properties of the $\bar{D}_s$ meson.
description: 23 pages, 9 figures, 2 tables