bluuebunny/crossref_metadata_2025_split huggingface dataset:
Classificação da água subterrânea com base nos sólidos totais dissolvidos estimado
Authors: Braga Erika de Almeida Sampaio , Aquino Marisete Dantas de , Rocha Carlos Márcio Soares , Mendes Luzia Suerlange Araújo dos Santos , Salgueiro Ana Rita Gonçalves Neves Lopes 
Published: July 2021

No domínio hidrogeológico das rochas cristalinas, as águas subterrâneas do estado do Ceará apresentam elevados teores de sólidos totais dissolvidos que contribuem para uma péssima qualidade da água. Baseado nesse contexto, o estudo teve como objetivo classificar águas brutas de poços com base nos sólidos totais dissolvidos (STD) estimado, calculado pelo valor da condutividade elétrica (CE) medida, utilizando-se o programa Qualigraf. As amostras de águas foram coletadas em dez municípios do estado do Ceará, durante os meses de janeiro, fevereiro e março de 2020. As coletas foram realizadas de acordo com o Guia da Agência Nacional de Águas e a medida da condutividade elétrica foi realizada em campo utilizando-se um condutivimetro, método descrito no Standard Methods for the Examination of Water and Wasterwater. De acordo com os resultados médios obtidos, 50% das águas foram classificadas como águas salgadas (STD > 1.500,0mg.L1), 40% foram classificadas como águas salobras, (STD 500,0 a 1.500,0 mg.L1) e 10% foram classificadas como águas doces (STD < 500,0mg.L-1), segundo a Resolução nº357/2005 do Conama. Em relação a qualidade da água, comparando-se os resultados médios obtidos com o valor estabelecido pela Resolução nº 396/2008 do Conama, observou-se que 70% das amostras estavam em desacordo com a Resolução, concluindo-se que essas águas não estavam adequadas para o consumo humano.
Development and verification of the programming resilience scale for university students
Authors: Fu Qian , Zhang Li-Wen , Hong Jon-Chao , Dong Yan 
Published: July 2021

Learning programming challenges students who encounter difficulties such as resolving syntax and format errors. These challenges require students to invoke resilience to overcome programming problems and keep trying. In response, this study developed the programming resilience scale for university students (PRSUS). The snowball-sampling method was used to collect the data of science and engineering undergraduates, and the participants were divided into two groups (n1 = 316, n2 = 358) for an exploratory and a confirmatory factor analysis, respectively. For the PRSUS, 3 items were retained for each of 4 dimensions, namely: persistence, perceived value, difficulty cognition, and incremental belief. The reliability and validity indexes indicate the scale is reliable for measuring programming resilience. Moreover, the results showed that most undergraduates had a high level of programming resilience, and they could judge their level correctly in comparison to their peers. The study also found that, although no significant difference was found among the grade or age groups, the programming resilience of the male students was significantly better than that of the female students. The PRSUS is expected to help researchers and teachers to identify students who have difficulties learning programming and to provide early interventions to students.
Implications for practice or policy:

Students can use the PRSUS to test if they have a high level of programming resilience and improve their programming resilience in a targeted way.
Educators can use the PRSUS to identify students who find it difficult to finish programming learning or to judge whether their teaching can make students more willing to overcome programming difficulties.
Instructional design and instructional effectiveness in virtual classrooms: Research trends and challenges
Authors: Cukurbasi Baris , Kiyici Mubin 
Published: July 2021

This literature review aimed to examine the status, trends and tendencies in publications about virtual classrooms, instructional design in the virtual classroom and instructional effectiveness in the virtual classroom, as indexed in the ERIC database. For this review, we examined 2680 publications indexed in ERIC between 1994 and 2018. We collected data with data mining and utilised several Python libraries as resources for developing the analysis plan. The results of the analysis are presented in visual form. For each of the three subject matter areas examined in this study, we present the themes in the publications by years, titles, abstracts and ERIC descriptors. We report in detail the trends and challenges that emerged from the analysis. The results show that the words “learning”, “online”, and “environment” were prominent in each of the three subject matter areas. The primary topics addressed were literacy and curriculum development, and researchers examined the roles of instructors, learners and managers.
Implications for practice or policy:

This review will be a useful resource for scientists, researchers and policymakers who conduct studies on the virtual classroom.
Instruction should be planned according to differences in instructor, learner and manager roles, as revealed by the studies.
Practitioners who want to teach in virtual classrooms can also use it as a guide.
Co-word analysis and academic performance from the Australasian Journal of Educational Technology in Web of Science
Authors: López-Belmonte Jesús , Moreno-Guerrero Antonio-José , Pozo-Sánchez Santiago , Marín-Marín José-Antonio 
Published: July 2021

Since its inception in 1985, the Australasian Journal of Educational Technology (AJET) has been dedicated to the diffusion of studies on the integration of technology in higher education. Its track record in this field has placed it in the first quartile of the Scimago Journal & Country Rank. The objective of the study was to reveal to the scientific community the journey and evolution that this journal has had throughout its existence in Web of Science. A bibliometric methodology was used, supported by a scientific mapping from a unit of analysis of 798 documents. For this reason, a co-word analysis can be a fundamental tool for understanding the characteristics of their production and their impact on the scientific community. There is an evident progressive evolution of the studies published in the Australasian Journal of Educational Technology, with a first phase focused on the design and implementation of educational technology in learning environments, a second phase focused on the enrichment of technology and its acceptance within the processes of teaching and learning, and finally a stage focused on student and teacher perceptions of the implementation of technology in the educational context.
Implications for practice or policy:

We have established a contextual framework to show researchers current trends in educational technology and delineate future lines of research.
Those interested in this subject will have a set of bibliometric indicators to delve into the field of educational technology.
Higher education teachers and students will discover the evolution of the use of technology in learning spaces.
The motivic Igusa zeta function of a space monomial curve with a plane semigroup
Authors: Mourtada Hussein , Veys Willem , Vos Lena 
Published: July 2021

Abstract
In this article, we compute the motivic Igusa zeta function of a space monomial curve that appears as the special fiber of an equisingular family whose generic fiber is a complex plane branch. To this end, we determine the irreducible components of the jet schemes of such a space monomial curve. This approach does not only yield a closed formula for the motivic zeta function, but also allows to determine its poles. We show that, while the family of the jet schemes of the fibers is not flat, the number of poles of the motivic zeta function associated with the space monomial curve is equal to the number of poles of the motivic zeta function associated with a generic curve in the family.
Numerical semigroups, polyhedra, and posets II: locating certain families of semigroups
Authors: Autry Jackson , Ezell Abigail , Gomes Tara , O’Neill Christopher , Preuss Christopher , Saluja Tarang , Davila Eduardo Torres 
Published: July 2021

Abstract
Several recent papers have examined a rational polyhedron Pm
whose integer points are in bijection with the numerical semigroups (cofinite, additively closed subsets of the non-negative integers) containing m. A combinatorial description of the faces of Pm
was recently introduced, one that can be obtained from the divisibility posets of the numerical semigroups a given face contains. In this paper, we study the faces of Pm
containing arithmetical numerical semigroups and those containing certain glued numerical semigroups, as an initial step towards better understanding the full face structure of Pm
. In most cases, such faces only contain semigroups from these families, yielding a tight connection to the geometry of Pm
.
Doing digital. Die Universitätsbibliothek Osnabrück und die Herausforderungen der Coronakrise
Authors: Fangmeier Stefan , Hindersmann Jost , Laubenheimer Mathias , Thiel Anneke 
Published: July 2021

Zusammenfassung
Auch die Universitätsbibliothek Osnabrück wurde im März 2020 jäh von den Restriktionen zur Eindämmung der Coronapandemie betroffen und von jetzt auf gleich für Wochen geschlossen. Sofortmaßnahmen zur Sicherung der Literaturversorgung, neue elektronische Services und sukzessive Öffnungsschritte nach dem Lockdown markieren eine Praxis, die im Pandemiejahr kontinuierlich nachjustiert wurde, um der Dynamik der Krise und den Bedürfnissen der Nutzer*innen gerecht zu werden. Auch da, wo neue Angebote zur Förderung von Informationskompetenz entstanden und in intensiver Kommunikation mit Nutzer*innen die Strategien im Umgang mit der Krise erklärt und nachgesteuert wurden, wird es vermutlich nachhaltige Lerneffekte geben.
Lehre in Zeiten von Corona – ein Erfahrungsbericht
Authors: Fühles-Ubach Simone 
Published: July 2021

Zusammenfassung
Die Corona-Pandemie hat Präsenzvorlesungen an Hochschulen unmöglich gemacht. Mit nur minimaler Vorbereitungszeit musste der Vorlesungsbetrieb auf digitale Lehr- und Lernformate umgestellt werden. Der vorliegende Beitrag berichtet von den technischen und didaktischen Herausforderungen für Lehrende und Studierende sowie von den Chancen und Risiken, die sich aus der veränderten Situation ergeben.
Erweckt die Lücke an realer Begegnung und Ortswechsel eine neue bibliothekarische Vernunft, die der virtuellen?
Authors: Seeliger Frank , Ockel Katrin , Salaske Felix 
Published: July 2021

Zusammenfassung
Die Corona-Pandemie birgt neben den großen Herausforderungen auch Chancen, Wandel positiv zu gestalten. An der Hochschulbibliothek Wildau wurde bereits im Jahr 2019 die Agenda 2025 erarbeitet, deren Inhalte in verschiedenen Bereichen wie Infrastruktur, Raum- und Personalentwicklung ohne den gewohnten Publikumsverkehr nun noch fokussierter umgesetzt werden konnten.
A principal component analysis (PCA) based assessment of the gait performance
Authors: Gavrilović Marija , Popović Dejan B. 
Published: July 2021

Abstract
The gait assessment is instrumental for evaluating the efficiency of rehabilitation of persons with a motor impairment of the lower extremities. The protocol for quantifying the gait performance needs to be simple and easy to implement; therefore, a wearable system and user-friendly computer program are preferable. We used the Gait Master (instrumented insoles) with the industrial quality ground reaction forces (GRF) sensors and 6D inertial measurement units (IMU). WiFi transmitted 10 signals from the GRF sensors and 12 signals from the accelerometers and gyroscopes to the host computer. The clinician was following in real-time the acquired data to be assured that the WiFi operated correctly. We developed a method that uses principal component analysis (PCA) to provide a clinician with easy to interpret cyclograms showing the difference between the recorded and healthy-like gait performance. The cyclograms formed by the first two principal components in the PCA space show the step-to-step reproducibility. We suggest that a cyclogram and its orientation to the coordinate system PC1 vs. PC2 allow a simple assessment of the gait. We show results for six healthy persons and five patients with hemiplegia.
No more rattling: biomechanical evaluation of a hexapod ring fixator free of play
Authors: Greinwald Markus , Bliven Emily K. , Trompeter Alex , Augat Peter 
Published: July 2021

Abstract
Hexapod-ring-fixators have a characteristic rattling sound during load changes due to play in the hexapod struts. This play is perceived as unpleasant by patients and can lead to frame instability. Using slotted-ball-instead of universal-joints for the ring-strut connection could potentially resolve this problem. The purpose of the study was to clarify if the use of slotted-ball-joints reduces play and also fracture gap movement. A hexapod-fixator with slotted-ball-joints and aluminum struts (Ball-Al) was compared to universal-joint-fixators with either aluminum (Uni Al) or steel struts (Uni Steel). Six fixator frames each were loaded in tension, compression, torsion, bending and shear and mechanical performance was analyzed in terms of movement, stiffness and play. The slotted-ball-joint fixator was the only system without measurable axial play (<0.01 mm) compared to Uni-Al (1.2 ± 0.1) mm and Uni-Steel (0.6 ± 0.2) mm (p≤0.001). In both shear directions the Uni-Al had the largest play (p≤0.014). The resulting axial fracture gap movements were similar for the two aluminum frames and up to 25% smaller for the steel frame, mainly due to the highest stiffness found for the Uni-Steel in all loading scenarios (p≤0.036). However, the Uni-Steel construct was also up to 29% (450 g) heavier and had fewer usable mounting holes. In conclusion, the slotted-ball-joints of the Ball-Al fixator reduced play and minimized shear movement in the fracture while maintaining low weight of the construct. The heavier and stiffer Uni-Steel fixator compensates for existing play with a higher overall stiffness.
Crowdsourced COVID-19 Collections: A Brief Overview
Authors: Zumthurm Tizian 
Published: July 2021

Abstract
This article provides an overview of how public historians and other actors collect material on the global COVID-19 pandemic. Their common goal is to archive a diversity of perspectives to document these historic times. Focusing on initiatives that collect from a broader public and that incorporate some sort of crowdsourcing, I distinguish between two approaches: projects that collect something specific and projects that formulate their call more openly. The article discusses the strengths and weaknesses of each approach, what opportunities they open up, and what limits they impose on future research on the pandemic. The 10 selected case studies are based in 10 different countries, represent the variety of institutions that are involved in participatory collecting, and have all published their collections online and are thus useful for teaching and research worldwide.
CWDM communication system based inline erbium-doped fiber amplifiers with the linear geometrical polarization model
Authors: Eid Mahmoud M. A. , Sorathiya Vishal , Lavadiya Sunil , Parmar Juveriya , Patel Shobhit K. , Ali Shaimaa Ahmed , Rashed Ahmed Nabih Zaki 
Published: July 2021

Abstract
Optical fiber coarse wavelength division multiplexing (CWDM) with erbium-doped fiber inline-amplifiers for the linear polarization geometrical model is studied in this paper for fiber system optimization by using the Optisystem simulation software. Signal gain (SG), noise figure (NF), and signal/noise are measured against CWDM optical fiber variations. The erbium-doped fiber amplifier (EDFA) is based on the Giles model which solves the steady-state rate equations for SG and signal absorption parameters with the cross-section area of the amplifier itself. The signal is optimized at EDFA length of 6 m, 10 Gb/s data rates (DRs) transmission and 10 km CWDM fiber optic length (FOL). Max. Q factor is degraded and min. BER is upgraded with both CWDM optical FLs and higher DRs transmission increase.
Crystal structure of (E)-7-methoxy-2-((6-methoxypyridin-2-yl)methylene)-tetralone, C18H17NO3
Authors: Wang Lei , Meng Qing-Guo , Hou Gui-Ge 
Published: July 2021

Abstract
C18H17NO3, triclinic,

P

1
‾

$P&#x203e;{1}$

(no. 2), a = 4.0929(4) Å, b = 12.9527(11) Å, c = 14.4228(12) Å, α = 70.171(8)°, β = 87.229(8)°, γ = 87.567(8)°, V = 718.16(12) Å3, Z = 2, R

gt
(F) = 0.0549, wR

ref
(F
2) = 0.1526, T = 99.9(3) K.
The crystal structure of 6-bromohexanoic acid, C6H11BrO2
Authors: Ndima Lubabalo , Hosten Eric C. , Betz Richard 
Published: July 2021

Abstract
C6H11BrO2, monoclinic, P21/n (no. 14), a = 10.6730(14) Å, b = 5.2781(6) Å, c = 14.7781(18) Å, β = 109.610(4)°, V = 784.21(17) Å3, Z = 4, R

gt
(F) = 0.0225, wR

ref
(F
2) = 0.0564, T = 200(2) K.
The crystal structure of adamantylmethoxydiphenylsilane, C23H28OSi
Authors: Bauer Jonathan O. 
Published: July 2021

Abstract
C23H28OSi, monoclinic, P21/c (no. 14), a = 14.2882(11) Å, b = 17.8169(10) Å, c = 7.6201(6) Å, β = 103.780(8)°, V = 1884.0(2) Å3, Z = 4, R

gt
(F) = 0.0538, wR

ref
(F
2) = 0.1241, T = 173(2) K.
Participation of women in science in the developed and developing worlds: inverted U of feminization of the scientific workforce, gender equity and retention
Authors: Narasimhan Shobhana 
Published: July 2021

Abstract
We consider various factors impacting the participation of women in science throughout the world, with a particular emphasis on developing countries. For the world as a whole, we find that when the percentage of women working in science in a country is plotted vs. the per capita GDP of the country (adjusted for purchasing power parity) the data fall on an inverted U-shaped ‘boomerang’ curve. Thus, as per capita wealth increases, the percentage of women in science first increases and then falls. This is in marked contrast to the (right-side-up) U-shaped curve that is well-established for the participation of women in the labor force as a whole, suggesting that there are factors in the culture of science that result in opposing trends to those observed in the general workforce. This also results in many developing countries having a much higher participation of women in the scientific workforce than is seen in economically developed countries. Contradicting previous reports to the contrary, we find a positive correlation between gender equality in science and the degree of overall gender equity in the country. Thus, we do not find evidence for the claim that greater gender equity results in the manifestation of innate gender differences in preferences for science. We find differing patterns of retention in science for women in developing and developed countries. We also briefly discuss other factors that make it difficult for women in developing countries to follow a scientific career, or to advance in their careers.
SPIONs and magnetic hybrid materials: Synthesis, toxicology and biomedical applications
Authors: Friedrich Ralf P. , Janko Christina , Unterweger Harald , Lyer Stefan , Alexiou Christoph 
Published: July 2021

Abstract
In the past decades, a wide variety of different superparamagnetic iron oxide nanoparticles (SPIONs) have been synthesized. Due to their unique properties, such as big surface-to-volume ratio, superparamagnetism and comparatively low toxicity, they are principally well suited for many different technical and biomedical applications. Meanwhile, there are a numerous synthesis methods for SPIONs, but high requirements for biocompatibility have so far delayed a successful translation into the clinic. Moreover, depending on the planned application, such as for imaging, magnetic drug targeting, hyperthermia or for hybrid materials intended for regenerative medicine, specific physicochemical and biological properties are inevitable. Since a summary of all existing SPION systems, their properties and application is far too extensive, this review reports on selected methods for SPION synthesis, their biocompatibility and biomedical applications.
Extract hidden patterns in students' academic information to improve the curriculum by using data mining
Authors: Amerioon Saeide , Hosseini Mohammad Mehdi , Moradi Mahshid 
Published: July 2021

AbstractEducational data mining is an emerging exquisite field that has been successfully implemented in higher education. One of the best ways to increase the efficiency of this emerging phenomenon is to select efficient professors and effective teaching methods. This study is intended to show academic success factors to have better management in student curriculum, contextualizing the progress and to prevent unfavorable conditions for students. In this research, students of Shahrood University of Technology were studied. Initially, 3,765 samples of students' educational background were considered. Then, pre-processing was performed to make the data normalized. Next, several predictive models were developed using a supervised data mining approach. Next, five algorithms by the best result were selected. Comparing the results of algorithms applied to data, the two algorithms, radial basis function network and the Naïve Bayes with respectively value F-measure 0.929 and 0.942 showed more accurate results. Finally, the most effective feature was selected, the attributes ‘maximum semester’ and ‘the total number of units dropped’ were ranked an the most important, and the three attributes of ‘the basic courses average’, ‘the number of units of main courses’ and ‘the total average’, were placed in the next ranks.
Information Technology deployment in Human Resource Management: A case study in deprived regions
Authors: Akpamah Peter , Matkó Andrea 
Published: July 2021

Abstract
In recent years, managers of both private and public organizations in developing countries have been struggling to double production and improve service delivery in their organizations. Successful organizations in the western world were, however, identified with the use of Information Technology (IT). The paper examined the magnitude of IT and its application in human resource management. Four organizations from private and public sectors were selected from all. Two organizations from each sector, members of staff, Human Resource (HR) professionals and managers of these organizations were targeted. A structured questionnaire was used to collect data from the staff and unstructured interviews were designed to gather data from the HR practitioners and managers of these organizations. A statistical package for social sciences (SPSS) was used to analyse the data. In general, about 76.9% of the participants said that IT application in HR functions enhances organizational productivity. The selected organizations could boast of basic IT facilities, but their numerical strength still remains a challenge especially among organizations in the public sector. Organizations in both sectors must invest more in IT and its related accessories as a means of solving problem of inadequacy. Internet connectivity and company website were lacking in some organizations across both sectors and should be considered so as to improve upon the human resource functions and quality service delivery in the deprived regions of Ghana. Staff motivation, wage and salaries, strategic management and organizational leadership were mentioned as factors when put together with IT would augment productivity in any given economy.