bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parallelisation technique for serial 3D seismic codes: SMS approach
Authors: Arrigo Caserta  , Vittorio Ruggiero  , Maria Pia Busico  , Ivo Oprsˇal  
Published: June 2021

<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">We investigate a fast and easy way to parallelise seismological serial codes mainly oriented for simulating the</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">seismic wave propagation through anelastic dissipative media. Having an efficient modelling tool is important</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">in both assessing strong ground motion and mitigation of seismic hazard when the site effects are considered,</p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">and in crustal propagation when the crustal geological structures are of interest. Our chosen case study is representative of a set of such seismological 3D problems. The Scalable Modelling System (SMS) tool for parallelization is considered. The IBM SP5 native compiler has been used. Results such as Speed-Up and Efficiency are shown and discussed. SMS can run both in shared and distributed memory environments. The greater advantages of using SMS in such environments become apparent with the utilisation of a higher number of multiprocessor machines arranged in a cluster. We also demonstrate how successful porting from serial to parallel codes is realised by way of minimal instructions (6% of the serial original code only) provided that an ad hoc profiling analysis of the serial code is first performed.</p> <br />
Magnetic Declination Chart 2006 of Europe – produced by the MagNetE Group
Authors: Gerald Duma  , Barbara Leichter  , the MagNetE Group  
Published: June 2021

<p>During its 4th Workshop in Helsinki in 2009 the Group for European Repeat Station Surveys, MagNetE, decided to produce a European Declination Chart 2006 which is based on the numerous magnetic repeat station measurements performed in more than 20 countries in Europe. All surveys were conducted within a relatively short period between 2005 and 2007, the data set consists of declination values of 382 repeat stations and the annual mean values of 42 observatories. These first accorded surveys in Europe, providing hundreds of highly accurate magnetic vector data, can be considered the first geomagnetic survey of Europe. The resulting map shows the magnetic declination, which is of main public interest for navigation purposes.</p><p> </p>
Recognition of Pleistocene marine terraces in the southwest of Portugal (Iberian Peninsula): evidences of regional Quaternary uplift
Authors: Paula M. Figueiredo  , João Cabral  , Thomas K. Rockwell  
Published: June 2021

<p>Southwest mainland Portugal is located close to the Eurasia-Nubia plate boundary and is characterized by moderate seismicity, although strong events have occurred as in 1755 (Mw≥8), 1969, (Mw 7.9), and more recently in 2007 (Mw 5.9) and 2009 (Mw 5.5), all located in the offshore. No historical earthquakes with onshore rupture are known for this region. At the coastline, high sea cliffs, incised drainages, emergent marine abrasion platforms and paleo sea cliffs indicate that this region is undergoing uplift, although no morphological features were found that could be unequivocally associated with the 1755 mega earthquake. To better understand the recent tectonic activity in this sector of Iberia, it is necessary not only to analyze active structures on land, but also to search for evidence for deformation that may relate to inferred offshore active structures. We thus conducted a study of marine terraces along the coastline to identify regional vertical crustal motions. Several poorly preserved surfaces with thin sedimentary deposits, comprising old beach sediments, were recognized at elevations starting at 2 m elevation and rising inland up to a regional abrasion platform situated at about 120 m a.s.l.. We identified distinct paleo sea level references at several locations at consistent elevations. This terrace sequence is likely Late Pleistocene in age, with individual platforms correlative to MIS 5 high stands and is coherent with a long-term slow uplift of the littoral zone for the southwest of Portugal. Although dating of discrete platforms is an ongoing and difficult task, preliminary correlations of paleo-shoreline elevations suggest that the uplift rate is in the range of 0.1-0.2 mm/yr.</p>
Influence of Indian Ocean high pressure on streamflow variability over southwestern Australia
Authors: Saqib Ur Rehman  
Published: June 2021

<p> </p><p>The seasonal and interannual variability of the southwestern Australia streamflow was examined based on re-analysis dataset from the National Centers for Environmental Prediction / National Center for Atmospheric Research, plus monthly streamflow data from 17 meteorological stations obtained from the Department of Water of the Australian Water Resource Council (1976-2008). Significant findings reveal that since the middle of the last century, the early winter (May-August) streamflow variability over southwestern Australia has been associated with variability in the intensity of the Indian Ocean high pressure (IOHP) system, as well as the zonal movement of the high pressure system across the Indian Ocean. Of note, however, the emphasis in the previous studies has linked the ongoing winter drought in western Australia to changes in sea level pressure, both on a local basis and over larger areas. We introduce objective indices for the area-weighted pressure of the IOHP, and the IOHP area-weighted latitude (IOHLT) and longitude (IOHLN) positions. When the IOHP is shifted to the east, there is less streamflow in the southwestern Australian rivers that are examined in this study. The situation is reversed when the IOHP is shifted to the west, when there is more streamflow in the southwestern Australian rivers. The characteristics of the streamflow pattern are determined for the river catchment areas located around the coastal region over southwestern Australia using principal component analysis. The first principal component taken into consideration describes 84.43% of the total variance. The multiple correlation between the loading of the first principal component scores of the streamflow and the IOHP and IOHLN is 0.54, while the correlation between the southern oscillation index is 0.44. Centers of action indices explain 29% of the streamflow variability, while the southern oscillation index explains only of the 19% streamflow variability. This discovery is of real importance for the definition of the physical mechanism of seasonal (May-August) streamflow variability of southwestern Australian and the IOHP.</p><p><span style="text-decoration: underline;"><br /></span></p>
Krakatau caldera deposits: revisited and verification by geophysical means
Authors: Izumi Yokoyama  
Published: June 2021

<p> </p><p>One of the differences between volcanic craters and calderas is that the latter bottoms are flatways filled with caldera deposit with lower density in comparison to country rocks. The 1883 Krakatau eruption affords us important knowledge on caldera formation even if it was not observed with modern sophisticated instruments. First, volcanic activities of the Krakatau Islands before and after the 1883 eruption are reexamined: previous suppositions involving a caldera-forming eruption of the proto-Krakatau prior to 1883 proved to be unsupported by the bathymetric topographies and gravity anomalies on and around the Krakatau Islands. Then, Anak Krakatau is interpreted as a parasitic cone of the main Krakatau volcano. As supplementary knowledge to discussion of caldera deposits, the results of drillings at several calderas in Japan and Mexico are introduced. Mass deficiency of the caldera deposit at Krakatau caldera is estimated by the gravity anomaly observed there and converted to probable volume with suitable density. For quantitative examination of the subsurface structure beneath the Krakatau complex, spatial distributions of seismic S-wave attenuation and Vp/Vs ratios have been already studied by temporary seismological observations and their results have been published. The high ratios of Vp/Vs observed approximately at Krakatau caldera may be attributable to the caldera deposit that is low density and contain much water. As additional remarks, a zone having both the characters, S-wave attenuation and zones of relatively high Vp/Vs ratio, may be a probable magma reservoir centering at a depth of about 10 km.</p><p><span style="font-size: 12.000000pt; font-family: 'TimesNewRomanPSMT';"><br /></span></p>
Detection of Volcanic Plumes by GPS: the 23 November 2013 Episode on Mt. Etna
Authors: Massimo Aranzulla  , Flavio Cannavò  , Simona Scollo  
Published: June 2021

<p>The detection of volcanic plumes produced during explosive eruptions is important to improve our understanding on dispersal processes and reduce risks to aviation operations. The ability of Global Position-ing System (GPS) to retrieve volcanic plumes is one of the new challenges of the last years in volcanic plume detection. In this work, we analyze the Signal to Noise Ratio (SNR) data from 21 permanent stations of the GPS network of the Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, that are located on the Mt. Etna (Italy) flanks. Being one of the most explosive events since 2011, the eruption of November 23, 2013 was chosen as a test-case. Results show some variations in the SNR data that can be correlated with the presence of an ash-laden plume in the atmosphere. Benefits and limitations of the method are highlighted.</p>
Evaluation of a global model of ionospheric slab thickness for foF2 estimation during geomagnetic storm
Authors: Buldan Muslim  , Haris Haralambous  , Christina Oikonomou  , Sefria Anggarani  
Published: June 2021

<p class="p0">This study aims to evaluate the performance of the global model of ionospheric slab thickness (GMIST) in terms of F2 layer critical frequency (foF2) estimation during geomagnetic disturbed conditions. Hourly values of foF2 as obtained from ionosonde stations located at equatorial, low- and mid-latitude regions are compared with the corresponding GMIST and IRI-STORM modeled values. For this purpose, the correlation coefficient, daily mean, root mean square error and improvement percentage are calculated at different regions and geomagnetic disturbance levels. The results show that GMIST is more accurate than IRI-STORM model in terms of foF2 estimation at low- and mid-latitude regions, while at equatorial areas GMIST is less accurate during geomagnetically disturbed and quiet conditions.</p>
Significancia clínica de la presencia de granulomas en enfermedad de Crohn
Authors: Paredes Méndez Juan Eloy , Alosilla Sandoval Paulo Anibal , Vargas Marcacuzco Henry Tomas , Junes Perez Sonia Irene , Mestanza Rivasplata Ana Lucía , Paucar Aguilar Diego Ricardo , Arenas Gamio José Luis 
Published: June 2021

Los granulomas epitelioides son hallazgos característicos de un grupo de pacientes con enfermedad de Crohn (EC), pero su significancia con respecto a la severidad y progresión de la enfermedad es aún incierta. Objetivo: Evaluar las características clínicas de los pacientes con EC en relación a la presencia o no de granulomas en los hallazgos histológicos. Materiales y métodos: Estudio observacional, descriptivo, retrospectivo en pacientes con diagnóstico de EC desde enero 2004 a diciembre 2019 en el servicio de gastroenterología del Hospital Nacional Guillermo Almenara Irigoyen, Lima-Perú. Resultados: Se incluyó 55 pacientes con media de edad de 56 ± 8,2 años. La mediana de tiempo de enfermedad fue de 16 meses. Tener dos o más recaídas al año (p<0,001; OR= 9,75), edad menor a 30 años (p<0,001; OR=3,57) y un CDAI moderado a severo (≥220 puntos, OR= 11,4; p<0,008) se asoció significativamente con la presencia de granulomas. La actividad endoscópica severa (p<0,003; OR= 9,91) y el fenotipo estenosante-penetrante (p<0,001; OR= 22,1) también mostraron asociación con la presencia de granulomas. El grupo de granulomas presentó mayor probabilidad de uso de corticoides (p<0,024; OR= 3,92) e inmunomodulador (p<0,001; OR= 7,10) además de necesidad de cirugía de resección intestinal (p< 0,027; OR: 5,07). Conclusiones: La presencia de granulomas en EC podría asociarse a mayor severidad clínica, endoscópica, requerimiento de terapia inmunosupresora y mayor necesidad de resección intestinal.
Comparison of High-Flow Nasal Cannula and Conventional Oxygen Therapy Following Extubation After Pediatric Cardiac Surgery: A Retrospective Study
Authors: Şavluk Ömer Faruk , Yılmaz Abdullah Arif , Yavuz Yasemin , Ukil Işıldak Fatma , Özbek Babürhan , Arslanoğlu Ergin , Çine Nihat , Ceyran Hakan 
Published: June 2021

Introduction: Infants and children with congenital heart disease may develop respiratory failure in association with cardiac surgery or as a result of heart disease. In fact, the postextubation period in this group of patients can be complex and the use of continuous positive airway pressure or non-invasive ventilation may be necessary if conventional oxygen therapy is not sufficient. The aim of our study was to compare efficiency and outcomes of high-flow nasal cannula or conventional oxygen therapy post-extubation after pediatric cardiac surgery.
Patients and Methods: A single centre retrospective study was conducted between January and December 2020 in our 12 beds pediatric cardiac intensive care unit. Patients were divided into two groups. In one group 45 patients (Group I), those who received high-flow nasal cannula after extubation, and in the other group 45 patients (Group II), those who received oxygen therapy with a mask after extubation. The aim of the study was to evaluate the rela- tive efficacy of high flow nasal cannula and conventional oxygen therapy on PaCO2, PaO2 and PaO2/FiO2.
Results: PaO2 values at 1, 6, 12, 24 and 48 hour post-extubation were significantly higher in high-flow nasal cannula group (p< 0.05). PaCO2 values were significantly lower in the high-flow nasal cannula group at 1, 6, 12, 24 and 48 hour post-extubation (p= 0.01). PaO2/FiO2 values in high-flow nasal cannula group at all-time points post-extubation were significantly higher than in conventional oxygen therapy group (p= 0.01).
Conclusion: High-flow nasal cannula is useful in decreasing PaCO2 and improving PaO2 in children follow- ing extubation after cardiac surgery. In addition, the simplicity of and tolerability to high-flow nasal cannula is also important. Although more expensive, the use of high-flow nasal cannula can be considered as a safe and effective alternative to conventional oxygen therapy following pediatric cardiac surgery.
Estado do conhecimento sobre formação de professores de inglês para crianças: O que revelam os estudos publicados nos últimos dez anos?
Authors: Lima Ana Paula , Jotto Kawachi-Furlan Cláudia 
Published: June 2021

O objetivo deste artigo é discutir os dados de um estado do conhecimento acerca da formação de professores de língua inglesa para crianças (LIC). O estudo foi desenvolvido por meio da consulta ao tema em 66 revistas brasileiras on-line, no estrato A do Qualis Periódicos (2013-2016), no período de 2010 a 2020. Foram encontrados apenas três estudos, cujos focos envolvem formação inicial, formação continuada e formação crítica de professores de LIC. As autoras desses trabalhos enfatizam a necessidade de formação específica nos cursos de Letras e também salientam a importância da formação continuada, que é compreendida como integrante do processo de desenvolvimento profissional e privilegia momentos de reflexão e partilha de experiência. As pesquisadoras defendem, ainda, a formação crítica e reflexiva dos docentes, para que possam fazer escolhas conscientes para os contextos nos quais atuam. Considerando que as discussões apresentadas nesses trabalhos publicados há dez anos são ainda atuais, ressaltamos a urgência de regulamentação da oferta do ensino de línguas estrangeiras na Educação Infantil e anos iniciais do Ensino Fundamental e a relevância de estudos na área de formação de professores de LIC, a fim de contribuir com a formação crítica e planejada desses profissionais.
Developing endurance among children in preschool period
Authors: Gregorc Jera , Meško Maja , Videmšek Mateja 
Published: June 2021

Introduction: Prior research generally confirms the importance of endurance exercises in preschool period and suggests shorter and less intensive exercises. However, little research has been conducted to show and evaluate different types for developing endurance in preschool period. Our research aims to find out which type of exercise is more suitable for developing endurance for a preschool age child compared to an adult, taking into account developmental characteristics.
Material and methods: A total of 69 preschool children (40 children aged 3 years and 29 children aged 5 years) were included in the study. We measured their heart rates during two types of endurance exercises (uninterrupted walking vs “method of game”). We compared the average heart rate and the actual frequency curves.
Results: Endurance exercise according to the “method of game” allows the child to adjust the effort more individually compared to uninterrupted walking when both exercises are performed with a group of pre-school children. A comparison of heart rate curves showed that when children partook in the “ method of game”, they achieved different heart rate values at the same time. A further analysis of heart rate with 5 selected “time stamps” between the two exercises showed that children achieved statistically significant higher heart rates when performing the “method of game” (1’: Z = 2.20; p = 0.028, r = 0.19; 3 ‘: Z = 4.64; p = 0.00, r = 0.39; 5’: Z = 3.23; p = 0.001, r = 0.27; 8’: Z = 3.82 p = 0.00, r = 0.32; 13 ‘: Z = 3.33; p = 0.001, r = 0.28). The comparison of the mean heart rate values over the entire 13-minute time interval between the execution of the “method of game” (M = 143, SD = 14) and uninterrupted walking (M = 132, SD = 9) was statistically significantly higher in favour of the “method of game” (Wilcox test: Z = 5.83, p = 0.00, r = 0.24). The Mann-Whitney-Test showed that 3-year-old children achieved statistically significantly higher average heart rate during the “method of game” (Z = -2.34 p = 0.020, η² = 0.08) as well as during uninterrupted walking (Z = 3.17 p = 0.002, η² = 0.15). No statistically significant differences between boys and girls were confirmed.
Conclusions: Based on the results obtained, we believe that endurance exercise according to the “method of game” is more suitable for a developing preschool child than uninterrupted walking. The “method of game” also allows the simultaneous implementation of endurance exercise in heterogeneous groups, since the children adapt to the effort themselves, regardless of age. We believe that other types of endurance exercises should be researched and all age groups of preschool children should be included in the research.
Investigation of Quality Control Measurements with Aging X-Ray Machines
Authors: Agaku M. R. , Akaagerger N. B. , Ode O. S. 
Published: June 2021

The investigation of Quality Control measurement (QC) with ageing x-ray machines was undertaken. Ten x-ray machines were examined across different hospitals within Makurdi metropolis, Benue State using Gammex 330 kV meter and ten (10) X-ray Machines in government hospitals (GH) and private hospitals (PH) with age’s (4-12) years for new X-ray Machines and (22-47) years for aged X-ray Machines. With these, on the quality of diagnostic X-rays and patient’s dose were examined separately when a graph of age of the machine was plotted against the power n of the kVp and a graph of machines age was plotted against radiation intensity. Based on the analysis obtained in this study, the value of n for the new machines with ages (5-12) years has a value of and aged machines with ages (22-47) years has a value of. This shows that there is a relationship between age and n. In conclusion, the findings of the present study showed that the output radiation dose of new and aged x-ray units differs at the same kVp and mAs measurements, indicating that the x-ray tube deteriorates as its ages increase, thereby posing higher health risk to patients and as such, the study recommends that QC measurement be undertaken on x-ray machines at definite stages of the machines life to verify the effects of aging of a machine on patient's dose.
Characterization of Water Quality on University Campus
Authors: Ogeleka Doris Fovwe , Emegha Mildred Chukwuedum 
Published: June 2021

Introduction: Safe drinking water is vital to all human and living organisms.
Aim and Study Location: This study appraised untreated water within the Federal University of Petroleum Resources, Effurun (FUPRE) campus with a view to ascertaining their potability.
Methodology: The samples were analyzed using the America Public Health Association (APHA), standard protocol
Results: The pH indicated that the water were acidic with pH values from 3.50 ± 0.04 to 5.73 ± 0.08. Total iron exceeded the stipulated WHO limit of 0.3 mg/L in some of the locations with concentration varying from 0.232 ± 0.01 to 0.963 ± 0.04. The heavy metal load was relatively low and within regulatory limits.
Conclusion: The study concluded that water should not be consumed without treatment due to the non-conforming parameters. In addition, waters with a non-conformance contributed by feacal coliform (E coli) or any other microbial entities should be avoided since serious health water-related diseases (cholera, typhoid, dysentery and diarrheal) may set if consumed.
The Well-being of Staff in a Welsh Secondary School before and After a COVID-19 Lockdown
Authors: Smith Andrew P. , James Arwel 
Published: June 2021

Background: There has been extensive research on the well-being of teachers, with much of it focusing on stress and mental health problems. Recent research has led to the development of the well-being process model, which examines predictors of positive and negative well-being outcomes. Research is now required to examine this model's applicability to teachers and those who communicate in languages other than English. Well-being has also been reduced by social isolation associated with COVID-19, and it is essential to investigate the causes of this reduced well-being.
Aims: The present study had three main aims. First, to examine the applicability of the well-being process model to teachers. Secondly, to investigate a sample where teaching was in the Welsh language. Finally, to examine the response to the COVID-19 lockdown in this group and identify predictors of current and long term well-being.
Methodology: The research was approved by the ethics committee, School of Psychology, Cardiff University, and carried out with the informed consent of the volunteers (67 staff from a Welsh-medium secondary school; mean age 36.8 years, range 19-53 years; 71% female). An online survey was carried out, and regressions conducted to examine associations between the well-being process predictor variables and the well-being outcomes. Predictors of current and long term well-being were also examined.
Results: Thirty-six per cent of the sample reported high stress levels, but clinically significant anxiety and depression levels were low (7.2% anxiety; 4.4% depression). Positive well-being was predicted by high scores for psychological capital, social support, positive coping and low scores for negative work characteristics. Negative well-being was predicted by high negative work characteristics and negative coping, and low psychological capital scores. Current and long term COVID-19-related well-being was predicted by fear of infection and the stress of isolation.
Conclusion: The results confirmed the applicability of the well-being process model to Welsh secondary school staff. Lockdown during COVID-19 affected well-being, with the risk of infection and the stress of isolation being the major influences.