The space weather station at the University of Alcala

The Space Weather station at the University of Alcala (UAH-STA) is a place for instrumentation that is able to produce useful products and services in a worst case scenario, assuring decision-makers the access to the data and consequently, increasing the confidence to take actions. The current development consists of an antenna to monitor ionospheric disturbances through the reception of very low frequency waves and a magnetometer to indicate the geomagnetic disturbances caused by sources external to the Earth. This work shows the development of both instruments and some examples of ionospheric and geomagnetic events recorded by both of them. This project serves also as a successful story of using space weather as a teaching tool due to the involvement of undergraduate students at final stage of industrial and telecommunication engineering.

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Prosthetic rehabilitation of maxillary lateral incisors agenesis using dental mini-implants: a multicenter 10-year follow-up

Clinical Oral Investigations ◽

10.1007/s00784-021-04176-0 ◽

2021 ◽

Author(s):

M. Lacarbonara ◽

A.P. Cazzolla ◽

V. Lacarbonara ◽

L. Lo Muzio ◽

D. Ciavarella ◽

...

Keyword(s):

Survival Rates ◽

Case Analysis ◽

Wilcoxon Test ◽

Complete Case Analysis ◽

Case Scenario ◽

Complete Case ◽

Worst Case ◽

Mini Implants ◽

The University

Abstract Objectives Implants are used to replace congenitally missing lateral incisors but often the space across the alveolar crest is too narrow to permit their use. This multicenter study (Dental Clinic of the University of Foggia, Odontostomatology Clinic of the University of L’Aquila) evaluated the efficacy of mini-implants in cases of maxillary lateral incisor agenesis with severe osseous atrophy in 10-year follow-up. Materials and methods Forty-seven mini-implants have been inserted in 35 patients affected by lateral incisors agenesis (23 single and 12 bilateral ageneses). All patients underwent orthodontic opening of the space of the upper lateral incisors. After the insertion of the implants, the immediate, non-functional loading, positioning of crowns, presence of pain during percussion and mini-implant function, horizontal and vertical movement when a force of 5 N was applied, ridge loss, and plaque index have been evaluated 1 month after loading, 1 year after loading, and then every 5 years in the following 10 years. Little’s test was used to evaluate the assumption that data of loss to follow-up implants are missing completely at random (MCAR) and that a complete-case scenario could be adopted. Wilcoxon test was carried out to look statistically significant differences between the various parameters resulting in the complete-case scenario and those assumed for the worst scenario. The software R (v. 3.6.1, 2019) was employed to perform the statistical analysis. Results The results obtained over 10 years range from 89% of success rate in a worst-case scenario to the 100% using a complete-case analysis with satisfactory values of marginal bone resorption and good conditions of the peri-implant tissue. Ten-year follow-up using complete-case analysis shows survival rates of 100% for implants with no signs of peri-implantitis, stability of the marginal bone levels and soft tissue around the dental implants. Conclusions The data collected show very good implant stability, absence of progressive peri-implantitis, and satisfactory aesthetical results in time (no signs of infraocclusion). Clinical relevance Mini-implants can be considered a valid and stable over time solution in the restorative treatment of maxillary lateral incisors agenesis.

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”De sidder i deres egen lille gruppe ovre i hjørnet”– en pilotundersøgelse af etniske minoritetsstuderendes møde med studie- og undervisningsmiljøet på farmaceutstudiet

Dansk Universitetspædagogisk Tidsskrift ◽

10.7146/dut.v9i16.8036 ◽

2014 ◽

Vol 9 (16) ◽

pp. 58-71

Author(s):

Gro Inge Hansen

Keyword(s):

Ethnic Minority ◽

Minority Students ◽

Pedagogical Practices ◽

Pharmaceutical Sciences ◽

Case Scenario ◽

Worst Case ◽

Ethnic Minority Students ◽

Pharmaceutical Science ◽

Master Thesis ◽

The University

I artiklen fokuseres på, hvordan studie- og undervisningsmiljøet på farmaceutstudiet på Københavns Universitet (KU) kan risikere at danne ramme for en adskillelse mellem etniske minoritetsstuderendes og etnisk danske studerendes faglige og sociale studieliv. Der argumenteres for, hvordan dette kan påvirke etniske minoritetsstuderendes uddannelsesudbytte og i værste fald bevirke, at de dropper ud af deres studie. Afslutningsvis perspektiveres omkring, hvad man kan gøre for at mindske disse skel i studie- og undervisningsmiljøet på farmaceutstudiet. Udgangspunktet for denne artikel er en kvalitativ pilotundersøgelse udført i forbindelse med et speciale om studiepraksis og pædagogisk praksis på medicinstudiet og på farmaceutstudiet på KU. The academic environment at the University of Copenhagen’s School of Pharmaceutical Sciences may contribute to a separation between ethnic minority students and ethnic Danish students in both social and vocational settings. This article examines how this could affect ethnic minority students’ educational outcomes, and in a worst-case scenario lead to their dropout of the School of Pharmaceutical Science. . A number of suggestions to address the situation are outlined. The article is based on a qualitative pilot analysis carried out as a part of a Master thesis about study practices and pedagogical practices in the Medicine Program at the Panum Institute and the School of Pharmaceutical Science at the University of Copenhagen.

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Maxmin with multiple tastes and beliefs

Panorama brasileiro de tungstênio (w) entre os anos de 2008 e 2014 ◽

10.32749/nucleodoconhecimento.com.br/social-sciences/maxmin ◽

2020 ◽

pp. 67-78

Author(s):

Bruno Beltrão Léo

Keyword(s):

Representation Theorem ◽

Doctoral Program ◽

Case Scenario ◽

Worst Case ◽

Doctoral Thesis ◽

The Difference ◽

The University ◽

Multiple Scenarios ◽

Special Case ◽

Made In

This paper presents the main results of my doctoral thesis written in 2016 as part of the requirements to obtain the Doctor degree in the Doctoral Program in Economics at the University of Brasilia (UnB). It regards the axiomatization of a model of complete preferences under uncertainty that allows for a multiplicity of tastes and beliefs. As in Gilboa and Schmeidler (1989), the analysis is made in an Anscombe-Aumann setup and each act is evaluated by the worst-case scenario. The difference is that while in Gilboa and Schmeidler (1989) the multiple scenarios are composed of a set of priors, here they are composed of a set of probability-utility pairs. Thus, after imposing some postulates on preferences, we come to our main result, described in the form of a representation theorem (Theorem 1). A special case in which the multiple scenarios are a consequence of the multiplicity of tastes only is also axiomatized (Theorem 2).

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What you see is what you learn? The role of visual model comprehension for academic success in chemistry

Chemistry Education Research and Practice ◽

10.1039/c9rp00016j ◽

2019 ◽

Vol 20 (4) ◽

pp. 804-820 ◽

Cited By ~ 5

Author(s):

Thomas Dickmann ◽

Maria Opfermann ◽

Elmar Dammann ◽

Martin Lang ◽

Stefan Rumann

Keyword(s):

Academic Success ◽

Content Knowledge ◽

Academic Career ◽

Drop Out ◽

Case Scenario ◽

Worst Case ◽

Visual Model ◽

Visual Models ◽

Key Factor ◽

The University

Visualizations and visual models are of substantial importance for science learning (Harrison and Treagust, 2000), and it seems impossible to study chemistry without visualizations. More specifically, the combination of visualizations with text is especially beneficial for learning when dual coding is fostered (Mayer, 2014). However, at the same time, comprehending the visualizations and visual models appears to be rather difficult for learners (e.g., Johnstone, 2000). This may be one reason for the difficulties students experience especially during the university entry phase, which in a worst-case-scenario can result in high university drop-out rates as they are currently found in science-related study courses (Chen, 2013). In this regard, our study investigates, how the ability to handle and learn with visualizations – which we call visual model comprehension – relates to academic success at the beginning of chemistry studies. To do so, we collected the data of 275 chemistry-freshmen during their first university year. Our results show that visual model comprehension is a key factor for students to be successful in chemistry courses. For instance, visual model comprehension is able to predict exam grades in introductory chemistry courses as well as general chemistry content knowledge. Furthermore, our analyses point out that visual model comprehension acts as a mediator for the relation between prior knowledge and (acquired) content knowledge in chemistry studies. Given this obvious importance of visual model comprehension, our findings could give valuable insights regarding approaches to foster chemistry comprehension and learning especially for students at the beginning of their academic career.

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The next generation of IGS ROTI Maps: an extension toward global coverage

10.5194/egusphere-egu2020-17905 ◽

2020 ◽

Author(s):

Andrzej Krankowski ◽

Iurii Cherniak ◽

Irina Zakharenkova ◽

Adam Fron ◽

Kacper Kotulak

Keyword(s):

Northern Hemisphere ◽

Space Weather ◽

Ionospheric Irregularities ◽

Next Generation ◽

Dual Frequency ◽

Case Scenario ◽

Worst Case ◽

Plasma Irregularities ◽

Low Latitudes ◽

Global Coverage

The International GNSS Service (IGS) has accepted for official release a new ionospheric product for specification of ionospheric irregularities occurrence and intensity over the Northern Hemisphere as derived from multi-site ground-based GPS observations. Initially, we focused on the Northern Hemisphere auroral and midlatitude regions because of the highest concentration of the GNSS users and user supporting permanent networks located within the American, European, and Asian sectors. The IGS ROTI maps product is routinely generated by multi-step processing of carrier phase delays in dual-frequency GPS signals and transferred to the IGS CDDIS database. Now, ROTI maps allow regular monitoring of ionospheric irregularities over the Northern Hemisphere and provide information about past events when strong ionospheric irregularities developed here.Obviously, the plasma irregularities that occur at high, middle, and low latitudes have different physical mechanisms of their origin and development. For study of the climatological features of ionospheric irregularities occurrence, investigation of the ionospheric responses for Space Weather drivers, processes derived from below, this actual ROTI Map product is required to cover low latitudes and the Southern hemisphere polar and midlatitudes.During last decade, numerous ground-based permanent receivers were deployed within the global and regional networks and these observations are publicly available. These data can support our activity toward extending the current IGS ROTI maps product for a global coverage. In this paper, we present initial results of ROTI maps product performance to characterize ionospheric irregularities exited by different types of geophysical processes and space weather events. The next generation of the IGS ROTI maps product can be a valuable tool for global ionospheric irregularities monitoring and retrospective analysis of plasma irregularities impact on the GNSS positioning in the &#8220;worst case scenario&#8221; domain.The research is supported by the National Science Centre, Poland, through grants 2017/25/B/ST10/00479 and 2017/27/B/ST10/02190 and the National Centre for Research and Development, Poland, through grant DWM/PL-CHN/97/2019&#160;Keywords: GPS, ionosphere, ionospheric irregularities, ROTI, IGS

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Assessment of debris-flow susceptibility at medium-scale in the Barcelonnette Basin, France

Natural Hazards and Earth System Science ◽

10.5194/nhess-11-627-2011 ◽

2011 ◽

Vol 11 (2) ◽

pp. 627-641 ◽

Cited By ~ 56

Author(s):

M. S. Kappes ◽

J.-P. Malet ◽

A. Remaître ◽

P. Horton ◽

M. Jaboyedoff ◽

...

Keyword(s):

Regional Scale ◽

Low Frequency ◽

Data Availability ◽

Limiting Factor ◽

Case Scenario ◽

Worst Case ◽

High Dependency ◽

Digital Elevation ◽

Elevation Model

Abstract. Debris flows are among the most dangerous processes in mountainous areas due to their rapid rate of movement and long runout zone. Sudden and rather unexpected impacts produce not only damages to buildings and infrastructure but also threaten human lives. Medium- to regional-scale susceptibility analyses allow the identification of the most endangered areas and suggest where further detailed studies have to be carried out. Since data availability for larger regions is mostly the key limiting factor, empirical models with low data requirements are suitable for first overviews. In this study a susceptibility analysis was carried out for the Barcelonnette Basin, situated in the southern French Alps. By means of a methodology based on empirical rules for source identification and the empirical angle of reach concept for the 2-D runout computation, a worst-case scenario was first modelled. In a second step, scenarios for high, medium and low frequency events were developed. A comparison with the footprints of a few mapped events indicates reasonable results but suggests a high dependency on the quality of the digital elevation model. This fact emphasises the need for a careful interpretation of the results while remaining conscious of the inherent assumptions of the model used and quality of the input data.

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Wave and plasma measurements and GPS diagnostics of the main ionospheric trough as a hybrid method used for Space Weather purposes

Annales Geophysicae ◽

10.5194/angeo-26-295-2008 ◽

2008 ◽

Vol 26 (2) ◽

pp. 295-304 ◽

Cited By ~ 6

Author(s):

H. Rothkaehl ◽

A. Krakowski ◽

I. Stanislawska ◽

J. Błęcki ◽

M. Parrot ◽

...

Keyword(s):

Space Weather ◽

Acoustic Waves ◽

Particle Interaction ◽

Low Frequency ◽

Wave Activity ◽

Geomagnetic Disturbances ◽

Geomagnetic Field Line ◽

Unique Region ◽

Main Ionospheric Trough ◽

Plasma Measurements

Abstract. The region of the main ionospheric trough is a unique region of the ionosphere, where different types of waves and instabilities can be generated. This region of the ionosphere acts like a lens, focusing a variety of indicators from the equator of plasmapause and local ionospheric plasma. This paper reports the results of monitoring the mid-latitude trough structure, dynamics and wave activity. For these purposes, the data gathered by the currently-operating DEMETER satellite and past diagnostics located on IK-19, Apex, and MAGION-3 spacecraft, as well as TEC measurements were used. A global-time varying picture of the ionospheric trough was reconstructed using the sequence of wave spectra registered and plasma measurements in the top-side ionosphere. The authors present the wave activity from ULF frequency band to the HF frequency detected inside the trough region and discuss its properties during geomagnetic disturbances. It is thought that broadband emissions are correlated with low frequency radiation, which is excited by the wave-particle interaction in the equatorial plasmapause and moves to the ionosphere along the geomagnetic field line. In the ionosphere, the suprathermal electrons can interact with these electrostatic waves and excite electron acoustic waves or HF longitudinal plasma waves. Furthermore, the electron density trough can provide useful data on the magnetosphere ionosphere dynamics and morphology and, in consequence, can be used for Space Weather purposes.

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