bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimizing Cr(VI) adsorption parameters on magnetite (Fe3O4) and manganese doped magnetite (MnxFe(3-x)O4) nanoparticles
Authors: Ouma Linda , Pholosi Agnes , Onani Martin 
Published: April 2022

Abstract
Magnetite as an adsorbent is efficient since iron oxides have high affinities for heavy metal pollutants and are environmentally friendly. Manganese oxides provide catalytic properties which are desirable during the remediation of multi valent pollutants. Magnetite (Fe3O4) and manganese doped magnetite (MnxFe(3-x)O4) nanoparticles were synthesized and characterized to determine the manganese doping effects on magnetite’s crystal and surface properties. Fe3O4 and MnxFe(3-x)O4 showed similarities in crystal morphology indicating that manganese doping did not alter the nature of Fe3O4 nanoparticles. Manganese doping improved magnetite’s thermal properties as well as its surface area providing improved adsorption characteristics. The as-synthesized particles were applied in the optimization of hexavalent chromium adsorption. Adsorption proceeded under similar conditions for both adsorbents indicating their structural similarities. Higher efficiencies were observed on the doped adsorbent due to increased surface area and the presence of additional functional groups. Solution pH significantly affected the adsorption process aiding in the reduction of Cr(VI) ions to the less toxic Cr(III) species. The adsorption distribution coefficient KD indicated that manganese doping significantly improved magnetite’s affinity for hexavalent chromium. Adsorption and reduction were determined to responsible for pollutant reduction in solution at optimal conditions of pH 2, 5 g/L and 100 mg/L for adsorbent mass and solution concentration.
Bounds for the spectral radius of nonnegative matrices and generalized Fibonacci matrices
Authors: Adam Maria , Aretaki Aikaterini 
Published: April 2022

Abstract
In this article, we determine upper and lower bounds for the spectral radius of nonnegative matrices. Introducing the notion of average 4-row sum of a nonnegative matrix, we extend various existing formulas for spectral radius bounds. We also refer to their equality cases if the matrix is irreducible, and we present numerical examples to make comparisons among them. Finally, we provide an application to special matrices such as the generalized Fibonacci matrices, which are widely used in applied mathematics and computer science problems.
Gesprochene Lernerkorpora: Methodisch-technische Aspekte der Erhebung, Erschließung und Nutzung
Authors: Hirschmann Hagen , Schmidt Thomas 
Published: April 2022

AbstractThis article provides an overview of methodological and technical issues that arise in the collection, indexing and use of spoken learner corpora, i. e. corpora containing spoken utterances of learners of a target language. After an introductory discussion of the most important special features of this type of corpus that distinguish it from written language learner corpora and spoken corpora with L1 speakers, we will go into more detail on questions of corpus design. The main part of the paper is then an overview of the methodological and technical procedures of the individual steps of collecting, indexing, providing and using spoken learner corpora. The main aim of this overview is to highlight practices that can be considered best practices according to the current state of research. Finally, we outline the challenges that still exist for this type of corpus.
Sprachliche Komplexität im Unterricht
Authors: Weiss Zarah , Lange-Schubert Kim , Geist Barbara , Meurers Detmar 
Published: April 2022

AbstractWe investigate the linguistic complexity of oral classroom interactions in late primary and early secondary school across German school types. The goal is to explore whether teachers and students align in terms of their use of the academic language register. We empirically base this investigation on transcriptions of teacher and student contributions during content matter lessons on the vaporisation and condensation of water. Across school types and grade levels, we compare the extent to which teachers offer language that is adaptively rich in linguistic constructs commonly associated with academic language, such as deagentivation, nominal style, and cohesive devices. Putting this in relation to the developing academic language competence of the students, we then compare the language offered by the teachers to the use of these academic language constructs in the students’ spoken language contributions. We discuss the methodological challenges arising from analyzing oral classroom interactions and from applying automatic linguistic complexity analyses to such data.
Insighting the optoelectronic, charge transfer and biological potential of benzo-thiadiazole and its derivatives
Authors: Chaudhry Aijaz Rasool , Alhujaily Muhanad , Muhammad Shabbir , Elbadri Gamal A. , Belali Tareg M. , Al-Sehemi Abdullah G. 
Published: April 2022

Abstract
The current investigation applies the dual approach containing quantum chemical and molecular docking techniques to explore the potential of benzothiadiazole (BTz) and its derivatives as efficient electronic and bioactive materials. The charge transport, electronic and optical properties of BTz derivatives are explored by quantum chemical techniques. The density functional theory (DFT) and time dependent DFT (TD-DFT) at B3LYP/6-31G** level of theory utilized to optimize BTz and newly designed ligands at the ground and first excited states, respectively. The heteroatoms substitution effects on different properties of 4,7-bis(4-methylthiophene-2yl) benzo[c] [1,2,5]thiadiazole (BTz2T) as initial compound are studied at molecular level. Additionally, we also study the possible inhibition potential of COVID-19 from benzothiadiazole (BTz) containing derivatives by implementing the grid based molecular docking methods. All the newly designed ligands docked with the main protease (MPRO:PDB ID 6LU7) protein of COVID-19 through molecular docking methods. The studied compounds showed strong binding affinities with the binding site of MPRO ranging from −6.9 to −7.4 kcal/mol. Furthermore, the pharmacokinetic properties of the ligands are also studied. The analysis of these results indicates that the studied ligands might be promising drug candidates as well as suitable for photovoltaic applications.
No Changes in Body Composition in NCAA Division I Collegiate Football Players because of COVID-19 Restrictions
Authors: Czeck Madeline A. , Roelofs Erica J. , Evanoff Nicholas G. , Dengel Donald R. 
Published: April 2022

Abstract
Czeck, MA, Roelofs, EJ, Evanoff, NG, and Dengel, DR. No Changes in body composition in NCAA Division I Collegiate Football Players due to COVID-19 restrictions. J Strength Cond Res 36(6): 1749–1752, 2022—The purpose of this study was to explore the impact of coronavirus disease 2019 (COVID-19) restrictions on body composition, assessed by dual x-ray absorptiometry (DXA), between the 2020 postseason (pre–COVID-19 restrictions) and the 2021 postseason (post–COVID-19 restrictions) in collegiate football players (n = 50). In addition, a subset of athletes (n = 23) was used to explore body composition variables across 4 postseason time points. Body composition variables assessed were total and regional body fat percent, total mass, lean mass, fat mass, bone mineral content, bone mineral density, and visceral adipose tissue mass. Paired t-tests were used to determine differences between the 2020 postseason and the 2021 postseason in body composition variables. Analysis of variance with Tukey HSD post hoc tests assessed significant differences in total and regional body composition across 4 years while adjusting for multiple comparisons. There were no significant differences (p > 0.05) between postseason 2020 and postseason 2021 for all measures of body composition. In a subset of athletes, body composition was analyzed over a 4-year period of time. There were no significant differences between all 4 time points for all measures of body composition. In conclusion, body composition variables in this study's subjects were not affected because of coronavirus disease 2019 restrictions or over 4 years of their collegiate football career.
Local Path Planning Method for Unmanned Vehicle Based on Model Predictive Control in Hospital Environment
Authors: Ren Pingli 
Published: April 2022

Abstract
In order to address the obstacle avoidance problem of driverless vehicles in hospital environment, a local path planning method based on model predictive control is proposed. Firstly, the potential field model of driving environment factors including obstacles, environmental vehicles, roads, and target points is established by using artificial potential field theory. Then, based on model predictive control algorithm combined with driving environment potential field, trajectory planning and tracking are transformed into a unified constrained optimization problem. The objective function and constraint conditions of local path planning for unmanned vehicles are designed, and roll is introduced to the dynamic optimization mechanism. The simulation results show that the error between the path planning and the expected path is less than 0.1 m, the time consumption is at least 3.3 s, and it has strong robustness, which can effectively solve the obstacle avoidance problem of local path of unmanned vehicles.
ADME-Tox Prediction and Molecular Docking Studies of Two Lead Flavonoids From the Roots of Tephrosia Egregia Sandw and the Gastroprotective Effects of Its Root Extract in Mice
Authors: Rogério Marcos Eber F. , Chaves Hellíada V. , Pinto Isabela R. , de Sousa Nayara A. , Ribeiro Kátia A. , Monteiro Dina Andressa M. , e Silva Antonio Alfredo R. , Arriaga Ângela Martha C. , Teixeira Maria Valdeline S. , Pimenta Antônia T. A. , Jorge Roberta Jeane B. , Braz Helyson Lucas B. , de Paulo T. Pinto Vicente , de Moraes Maria Elisabete Amaral , Girão Virgínia C. C. , Bezerra Mirna Marques 
Published: April 2022

Abstract

Background: This study aimed to predict the pharmacokinetic and toxicological properties of lead flavonoids from the roots of T. egregia [praecansone A (1) and pongachalcone (2)], and to assess the gastroprotective effects and possible underlying mechanisms of the root extract in mice.

Methods: Quantitative and qualitative data for in silico absorption, distribution, metabolism, and excretion (ADME) analyses of the two flavonoids were acquired from the SwissADME database. Toxicity assessment was performed with the ProTox-II server. To evaluate the putative interactions of both flavonoids with opioid receptors and NO protein, we acquired structures of the targets (μ, κ, and δ-opioid receptors, and iNOS) in Homo sapiens from https://www.rcsb.org/. For docking studies, AutoDock 4.2 was used for ligand and target arrangement, and AutoDock Vina was used for calculations. For in vivo assays, mice were pretreated (per os) with T. egregia (2, 20, or 200 mg/kg). After 60 min, 99.9% ethanol (0.2 mL) was injected (per os). At 30 min after ethanol injection, the mice were euthanized, and the gastric damage, gastric levels of hemoglobin, glutathione content, and activity of superoxide dismutase and catalase were evaluated. To elucidate T. egregia mechanisms, we used misoprostol, a prostaglandin analog; indomethacin, an inhibitor of prostaglandin synthesis; L-arginine, an NO precursor; L-NAME, an antagonist of NO synthase; naloxone, an opioid antagonist; and morphine, an opioid agonist.

Results: In silico results showed that flavonoids (1) and (2) had favorable ADME properties and toxicity profiles, and exhibited satisfactory binding energies data (below −6.0 kcal/mol) when docked into their targets (μ, κ, and δ-opioid receptors, and iNOS). T. egregia decreased the ethanol-induced gastric damage and hemoglobin levels, and increased the glutathione content, and activity of superoxide dismutase and catalase. Naloxone and L-NAME, but not indomethacin, prevented T. egregia’s effects, thus suggesting that opioid receptors and NO are involved in T. egregia’s efficacy.

Conclusions: Flavonoids (1) and (2) exhibited favorable pharmacokinetic properties, showing high lethal dose, 50% (LD50; 3,800 and 2,500 mg/kg, respectively) values. Neither flavonoid was found to be hepatotoxic, carcinogenic, or cytotoxic to human cells. In vivo assays indicated that T. egregia ameliorated oxidative stress levels, and its mechanism is at least partially based on opioid receptors and NO. T. egregia may therefore be considered as a new gastroprotective strategy.
Stres i emocije u školi – percepcija zaposlenika i načini oporavka u funkciji psihološkog procvata
Authors: Cerinski Tomislav 
Published: April 2022

Cilj istraživanja jest ispitati razlike u percepciji doživljenog stresa, načinima oporavka od stresa različitih grupa zaposlenika u školama, psihološkog procvata, zadovoljstva životom, pozitivnih i negativnih emocija s obzirom na vrstu zaposlenja i radni staž. Drugi cilj istraživanja hijerarhijskom je regresijskom analizom ispitati doprinos spola, radnoga staža, zadovoljstva životom, emocija, doživljenog stresa i načina oporavka od stresa objašnjenju psihološkog procvata zaposlenika. Korištena je skala doživljenog stresa, skala zadovoljstva životom, PANAS skala, skala oporavka od doživljenog stresa i skala psihološkog procvata. Istraživanje je provedeno u petnaest osnovnih škola na ukupno 190 sudionika (166 žena i 24 muškarca). Među učiteljima i tehničkim osobljem razlike su utvrđene u psihološkom procvatu koji je viši kod učitelja, dok u razini zadovoljstva životom, pozitivnim i negativnom emocijama, doživljenom stresu i načinima oporavka od stresa razlike nisu utvrđene. Razlike s obzirom na radni staž u školi utvrđene su u psihološkom procvatu, zadovoljstvu životom i pozitivnim emocijama koji su viši kod ispitanika s manje radnoga staža u školi. Rezultati hijerarhijske regresijske analize ukazuju da se najveći dio psihološkog procvata učitelja može pojasniti pomoću zadovoljstva životom i pozitivnih emocija, dok se za tehničko osoblje pojašnjava pomoću zadovoljstva životom, doživljenog stresa, pozitivnih i negativnih emocija.
Perception of Distance Teaching as a Result of the COVID-19 Epidemic
Authors: Miletić Nikolina , Radoš Žaklina 
Published: April 2022

With the onset of the so-called Covid 19 crisis in 2020, face-to-face teaching was temporarily replaced by distance learning in several European countries, including at Croatian schools of all skill levels. Because the crisis could not be foreseen and therefore sufficient preparations could not be made in time, not only did the teachers unexpectedly switch to distance learning, but also the learners to home-based learning. This triggered several problems, among which the problem of work overload could be observed on all sides: be it on the part of teachers,learners or parents. This article examines the influence of distance learning and digital tools on students at the University of Zadar. In this research, it is assumed that the perception of distance learning and the associated use of digital media was assessed as quite negative due to the poor quality of distance learning. The reasons for the poor quality of distance learning are mainly due to the surprising change from face-to-face to distance learning and the associated inadequate preparation for distance learning, which caused general dissatisfaction at least in the first few weeks of distance learning. The results also point to systemic shortcomings in the quality and availability of information equipment and, in some cases, to the modest management of digital media by many teachers and students. However, distance learning offered an opportunity to reevaluate traditional face-to-face teaching and the role of teachers in society, as well as to illustrate the potentials and limitations of digital media.
Síntesis y caracterización del complejo órgano-mineral (Metoprolol Succinato-Montmorillonita) para la liberación controlada del Metoprolol Succinato
Authors: Pérez Niño Laura Marcela , Candela Soto Angelica María , Camargo García Hernando Alberto 
Published: April 2022

Debido a la necesidad actual de prolongar la acción de un fármaco y disminuir los efectos secundarios que se pueden generar en el paciente, se han desarrollado un gran número de investigaciones científicas que se centran en la implementación de sistemas que cubran las necesidades expuestas anteriormente, dando origen así a los sistemas de liberación controlada.
Este trabajo de investigación muestra la cinética de liberación del fármaco in vitro a partir de la síntesis del complejo Metoprolol Succinato (MPS)-montmorillonita (MMT) a pH 8. Laa presencia del fármaco en el espacio interlaminar del aluminosilicato se determinó mediante DRX de muestras policristalinas, y diferentes técnicas analíticas complementarias (Uv-Vis, FTIR y MEB), obteniendo como resultado que la introducción del MPS en la montmorillonita se debió a las interacciones de enlaces de hidrógeno y ion-dipolo y además se logró un 60% de eficiencia de encapsulación.
Por último, para la cinetica de liberación del fármaco el modelo que se adaptó mejor a los datos obtenidos de la liberación en el fluido gástrico simulado (SGF) fue el modelo de Korsmeyer-Peppas y de primer orden para el fluido intestinal simulado (SIF).
Pandemi Çağında Sürdürülebilirlik: T.C. Kültür ve Turizm Bakanlığının Sosyal Medyada Proaktif Kriz İletişimi Üzerine Bir Araştırma
Authors: SOLMAZ Başak , URHAN Bahar , TARAKCI Havva Nur , GAZAZ Doğan Can 
Published: April 2022

Turizm sektörü, bir ülkenin çevresel faaliyetlerinin gelişiminde ve devamlılığında önemli bir role sahiptir. Bu
nedenle, doğal afetler veya salgın hastalıklar gibi sektörü olumsuz etkileyebilecek durumlarda bile etkinliği
sürdürülmelidir. Bu çalışmanın temel amacı, koronavirüs pandemisi döneminde T.C. Kültür ve Turizm
Bakanlığının Twitter paylaşımlarındaki proaktif kriz iletişimi çabalarını, sürdürülebilirlik perspektifinden
incelemektir. Bu kapsamda, bakanlığın 20 aylık süreçte “@TCKulturTurizm” adlı resmi Twitter hesabında
paylaştığı, 1626 gönderi ve bu gönderilere yazılan toplamda 11 bin 293 yorum dört ayrı döneme ayrılarak
veri madenciliği tekniği ile analiz edilmiş; verilerin toplanması, kaydedilmesi, işlenmesi, analiz edilmesi
ve görselleştirilmesi sürecinde R Programlama Dili ve kütüphanelerinden yararlanılmıştır. Araştırma
kapsamındaki paylaşımlar ve bu paylaşımlara gelen yorumlar, proaktif kriz yönetimi ve sürdürülebilirlik
perspektifinden yorumlanmıştır. Koronavirüs sürecinde bakanlığın Twitter paylaşımlarındaki etkileşim,
[beğeni, cevaplanma ve yeniden paylaşım (Retweet) ortalamaları] dönemsel olarak artmıştır. Bakanlığın Twitter paylaşımlarına gelen yorumlar, insanların pandemiden kaynaklanan mağduriyetlerini iletebilme
çabalarını gösterse de ilgili paylaşımlar, proaktif kriz iletişimi kapsamında sürdürülebilirliğe yönelik içerik
açısından yeterli bulunmamıştır. Pandemi sürecinde paydaşların turizm ile ilgili güvenilir kaynaklardan
gelen verilerle doğru biçimde bilgilendirilmeleri ve yanlış bilgiler, yalan haberler ya da korkuya neden
olabilecek abartılı bildirimler almaktan korunmaları gerekmektedir. Bu nedenle, bakanlığın sosyal medya
kullanımında proaktif iletişimi ve sürdürülebilirliği esas alması önerilmektedir.
SHIFTING BUSINESS STRATEGY OF INTERNATIONAL STANDARD HOSPITAL IN METAVERSE ERA
Authors: Dewi Yurika Santika , Darma Gede Sri 
Published: April 2022

As the most impacted sector by the pandemic situation, healthcare services should be prepared to encounter the Metaverse era. Hospitals should start thinking strategies to be taken, especially for International Standard Hospital. The aim of the research is to determine and evaluate the effectiveness of shifting business strategy conducted by BIMC Siloam Nusa Dua Bali Hospital in encountering metaverse era. Qualitative and quantitative data is used in this research by using techniques of collecting data through interviews, observation, and documentation. Research informants as many as 8 people, the Chief Executive Officer, top management representatives, and operational representatives. For triangulation informants were represented by the Chief of Management, the Chief of Operating, and two patients. The used of analysis technique in this research is qualitative analysis. The result research indicate the occurrence of shifting business strategy initially with (1) main market is from foreign tourist turning onto domestic tourist, local residents and expats, (2) the existence of digitalization service innovations, and (3) the emergence of new product, Crisalix Virtual Aesthetics, and Bariatric Surgery.
Thoracic Sarcoma: A New Glance at the Epidemiological Characteristics of Disease in Iran from 2009 to 2014
Authors: Rahmani Seraji Hamide , Akbari Mohmmad Esmaeil , Rezvani Hamid , Bashash Davood , Mabani Maryam , Akbari Atieh , Raeisi Alireza , Janbabee Ghasem , Salari Sina 
Published: April 2022

Background: The heterogeneity, high rate of mortality and lack of comprehensive diagnostic methods have categorized primary sarcomas of the thorax as a malignancy with dismal outcomes and unknown etiology. Given the fundamental role of epidemiological analysis in establishing management strategies, we designed a study with focus on the epidemiological characteristics of primary thoracic sarcomas in Iran.
Methods: This national population-based cancer study was conducted on patients with histologically confirmed sarcoma of the thorax referred to the Iranian National Cancer Registry between 2009 and 2014. The incidence was calculated as number of cases per 100,000 person-years and was age-adjusted by the direct method using the weight of the 1960 world standard population.
Results: Over a 6-year period, 1477 cases with pathologically confirmed thoracic sarcomas were registered in Iran, of which 896 were male and 581 were female. Khuzestan Province had the highest incidence of thoracic sarcomas as compared to other provinces. Malignant mesothelioma was the most common histological subtype (20.85%). Moreover, the age-standardized incidence rate (ASR) of the disease was 1.94 per 100,000 which was more common in males than females with the highest incidence rate in men aged more than 65 years.
Conclusion: Our study provided valuable epidemiologic data on characteristics of thoracic sarcomas. This data can be used for strategizing preventive measures.