bluuebunny/crossref_metadata_2025_split huggingface dataset:
El “desierto digital”: repercusiones de la COVID-19 en la Educación en España y Brasil
Authors: Moura Viera María Edna , Luderitz Hoefel Maria da Graça , Réal Collado José Tomas 
Published: April 2021

Con la aparición de la COVID-19, la forma de hacer y pensar la educación mediatizada por las tecnologías digitales, surgió con una fuerza repentina y nunca experimentada de la forma en que la vimos ocurrir en el año 2020. Así, la nueva realidad educativa se evidencia en la distancia de los cuerpos y la distancia en los procesos de enseñanza y aprendizaje, que ha tenido numerosos impactos en la práctica diaria de la educación. Esta investigación busca conocer las percepciones de los profesores/as de educación básica en España y Brasil, sobre las repercusiones de la COVID-19 en la educación. Se trata de una investigación descriptiva-exploratoria, con enfoque cualitativo, que realizó 12 entrevistas semiestructuradas a profesores/as de educación básica de ambos países. Los resultados indican que la incorporación abrupta de tecnologías digitales provocó un gran sufrimiento a los docentes, debido a la falta de formación para ellos, falta de condiciones mínimas de trabajo, aparición de nuevas demandas profesionales y psicológicas, así como diferencias generacionales en las relaciones con las tecnologías.
With the emergence of Covid-19, the way of doing and thinking education permeated by digital technologies came up with sudden and never before seen strenght as we experienced in the year of 2020. With it, the new educational reality is highlighted in the distance between the bodies and the distance in teaching and learning processes, which has had numerous impacts in the daily practice of education. This investigation seeks to know the Basic Education professors and lecturers perceptions in Spain and Brasil, about the repercussions of Covid-19 in Education. It is a descriptive-exploratory investigation, with qualitative focus, that performed 12 semi-structured interviews to Basic Education teaching staff from both countries. The results indicate that the abrupt incorporation of digital technologies lead to a great suffering to teachers, on the account of a lack of training, lack of minimum working conditions, emergence of new professional and psychological demands, as well as generational differences in the relationships with the technologies.
La pedagogía de la muerte en la formación inicial docente
Authors: Colomo Magaña Ernesto , Gabarda Méndez Vicente , Cívico Ariza Andrea , Cuevas Monzonís Nuria 
Published: April 2021

La muerte es un fenómeno natural y, como tal, forma parte de nuestras vidas. Sin embargo, su inclusión como contenido curricular dista mucho de ser efectiva, ni en la formación de los estudiantes, ni en la de los docentes. Partiendo de esta realidad, la presente propuesta analiza la integración de la pedagogía de la muerte en los planes de formación inicial del futuro profesorado de Educación Primaria. Concretamente, se examinan las propuestas formativas de 15 universidades públicas, mediante la presencia de términos relacionados con esta disciplina desde una perspectiva mixta: por un lado, se explora cuantitativamente la presencia de los términos y, por otro, se analiza cualitativamente en qué asignaturas se integran y con qué sentido (biológico, religioso, filosófico o sociocultural). Los resultados ponen de manifiesto la escasez de términos vinculados con la muerte y, por ende, la práctica inexistencia de formación docente en pedagogía de la muerte, permitiendo identificar la necesidad de establecer estrategias que permitan formar a los maestros y maestras en esta cuestión.
Death is a natural phenomenon and, as such, is part of our lives. However, its inclusion as curricular content is far from being effective, neither in the training of students nor in teacher´s training. Based on this reality, this proposal analyses the integration of the pedagogy of death into the initial training plans of future teachers of Primary Education. Specifically, the training plans of 15 public universities are examined, through the presence of terms related to this discipline from a mixed approach: on the one hand, the presence of the terms is quantitatively explored and, on the other hand, qualitatively analyzed in which subjects are integrated and with what conception (biological, religious, philosophical or sociocultural). The results highlight the scarcity of terms linked to death and, therefore, the non-existence of teaching training in pedagogy of death, allowing to identify the need no establish strategies to train teachers on this issue.
Impact of Tooth Location on the Treatment of Multiple Gingival Recessions with Connective Tissue Graft Associated with a Coronally Advanced Flap
Authors: KAYAR Nezahat Arzu , AYTEKİN Zeliha 
Published: April 2021

Objectives: Coronally Advance Flap (CAF) effectiveness has been extensively evaluated, but little information is available regarding the effect of tooth position. This study aimed to evaluate the influence of tooth location on the outcomes of CAF with subepithelial connective tissue graft (SCTG) in the treatment of gingival recessions defects (GRs).
Materials and Methods: Nineteen patients who patients with a mean age of 36.3 ±7.6 years (11women, 8 men), each contributing Miller Class I and II GRs, were selected. Forty-four defects were treated with a combination of a CAF and a SCTG. Gingival recession depth (RD), gingival recession width (RW), probing depth (PD), and clinical attachment level (CAL) were recorded at baseline and 12 months postoperatively
Results: The mean root coverage from baseline to 1year post-surgery was 89 % for the maxillary GRs and 68 % for the mandibular GRs. RD and RW were decrease in both groups from baseline to 12 months (p&lt;0.001), but there was no statistically significant difference between maxillary and mandibular dentition. Both treatments showed satisfactory esthetic results (RES in maxillary teeth 8.2 ±1.3 and in mandibular teeth 7.6 ± 1.1).
Conclusions: The findings of the current study have shown that the CAF is an effective procedure for the treatment of multible GRs. Besides, the two groups (maxillary and mandibular GRs) showed similar significant improvements from baseline to 12 months evaluations.
Keywords: Connective tissue, gingival recession, surgical flaps, tooth.
Liquefied Natural Gas as Ship Fuel: A Maltese Regulatory Gap Analysis
Authors: Cassar Mark Philip , Dalaklis Dimitrios , Ballini Fabio , Vakili Seyedvahid 
Published: April 2021

With water covering almost three-quarters of the Earth’s surface and by factoring in that the maritime transport industry is holding the comparative advantage in relation to all other means, activities associated with the seas and oceans of our planet are extremely vital for the normal functioning of global trade. Furthermore, evaluating the opportunities of the so-called “Blue Economy” and possibilities for further growth should be at the epicentre of future development plans. Indicative examples -apart from various endeavours of maritime transport- include other sectors, like shipbuilding and repairs, fishing activities and related processes, as well as oil and gas exploration. All these provide significant economic output and facilitate job creation.
It is true that the shipping industry contributes to the carriage of vast quantities of cargo and maintains a crucial role in global trade; however, the specific industry is also responsible for significant quantities of greenhouse gas (GHG) emissions. IMO (MEPC) in 2018 adopted an initial strategy on the reduction of GHG emissions from ships. This plan envisages a reduction of CO2 emissions per transport work, at least 40% by 2030, pursuing efforts towards even further reduction by 2050, compared to the 2008 levels. It is imperative for shipping and related industries to investigate and introduce more environmentally friendly (“cleaner”) ways of operation. In the search for these cleaner fuels, it is the responsibility of maritime stakeholders to make available (economically viable) fuel alternatives worldwide.
In view of an increasing trend in using Liquefied Natural Gas (LNG) as a marine fuel, setting up regulations and amend national legislation to allow the provision of LNG as a ship fuel in a safe manner, is a first stage which potential service providing countries have to successfully fulfil. The current analysis is focusing on the small island state of Malta, which apart from certain international aspects introduced by the International Maritime Organisation (IMO), it has to abide by European Union’s (EU) regulations and make LNG as a marine fuel available until 2025. Its main aim is to provide ways to cover the identified regulatory gap of the Maltese legislation, relating to ports, ship fuel bunkering and the local gas market.
Dependent, Distracted, Bored
Authors: Paasonen Susanna 
Published: April 2021

A new approach to understanding the culture of ubiquitous connectivity, arguing that our dependence on networked infrastructure does not equal addiction.
In this book, Susanna Paasonen takes on a dominant narrative repeated in journalistic and academic accounts for more than a decade: that we are addicted to devices, apps, and sites designed to distract us, that drive us to boredom, with detrimental effect on our capacities to focus, relate, remember, and be. Paasonen argues instead that network connectivity is a matter of infrastructure and necessary for the operations of the everyday. Dependencies on it do not equal addiction but speak to the networks within which our agency can take shape.
Paasonen explores three affective formations—dependence, distraction, and boredom—as key to understanding both the landscape of contemporary networked media and the concerns connected to it. Examining social media platforms, mindfulness apps, clickbaits, self-help resources, research reports, journalistic accounts, academic assessments, and student accounts of momentary mundane technological failure, she finds that the overarching narrative of addicted, distracted, and bored users simply does not account for the multiplicity of things at play. Frustration and pleasure, dependence and sense of possibility, distraction and attention, boredom, interest, and excitement enmesh, oscillate, enable, and depend on one another. Paasonen refutes the idea that authenticity can be associated with lives led “off the grid” and rejects the generational othering and scapegoating of smart devices prescribed by conventional wisdom.
Single‐Atom Co‐Decorated MoS2 Nanosheets Assembled on Metal Nitride Nanorod Arrays as an Efficient Bifunctional Electrocatalyst for pH‐Universal Water Splitting
Authors: Doan Thi Luu Luyen , Nguyen Dinh Chuong , Prabhakaran Sampath , Kim Do Hwan , Tran Duy Thanh , Kim Nam Hoon , Lee Joong Hee 
Published: April 2021

AbstractThe commercialization of electrochemical water splitting technology requires electrocatalysts that are cost‐effective, highly efficient, and stable. Herein, an advanced bifunctional electrocatalyst based on single‐atom Co‐decorated MoS2 nanosheets grown on 3D titanium nitride (TiN) nanorod arrays (CoSAs‐MoS2/TiN NRs) has been developed for overall water splitting in pH‐universal electrolytes. When applied as a self‐standing cathodic electrode, the CoSAs‐MoS2/TiN NRs requires overpotentials of 187.5, 131.9, and 203.4 mV to reach a HER current density of 10 mA cm–2 in acidic, alkaline, and neutral conditions, respectively, which are superior to the most previously reported non‐noble metal HER electrocatalysts at the same current density. The CoSAs‐MoS2/TiN NRs anodic electrode also shows low OER overpotentials of 454.9, 340.6, and 508.0 mV, respectively, at a current density of 10 mA cm–2 in acidic, alkaline, and neutral mediums, markedly outperforming current OER catalysts reported elsewhere. More importantly, an electrolyzer delivered from the cathodic and anodic CoSAs‐MoS2/TiN NRs electrodes exhibits an extraordinary overall water splitting performance with good stability and durability in pH‐universal conditions.
Sol Electrolyte: Pathway to Long‐Term Stable Lithium Metal Anode
Authors: Sun Chuang , Dong Jing , Lu Xidi , Li Yinwei , Lai Chao 
Published: April 2021

AbstractLithium (Li) metal batteries are the subject of intense study due to their high energy densities. However, uncontrolled dendrite growth and the resulting pulverization of Li foil during the repeated plating/stripping process seriously diminish their cycling life. Herein, a facile approach using octaphenyl polyoxyethylene (OP‐10)‐based sol electrolyte is proposed to alleviate Li anode pulverization. This sol electrolyte possesses better ionic conductivity compared to gel and solid‐state electrolytes and also homogenizes Li ion diffusion throughout the entire electrolyte efficiently. As a result, Li/Li symmetric cells using this sol electrolyte demonstrate long‐term cycling stability for up to 1800 h, with a plating capacity of 3.0 mAh cm−2 without deteriorating the integrity of the thin Li foil. Using a conventional liquid electrolyte, electrode pulverization and battery failure can be observed after just three cycles. More importantly, a parameter of “throwing power” is introduced in a metal Li battery system to characterize the homogenizing ability of Li deposition in different electrolyte systems, which can serve as a guide to the efficient selection of electrolytes for Li metal batteries.
A HiPAD Integrated with rGO/MWCNTs Nano‐Circuit Heater for Visual Point‐of‐Care Testing of SARS‐CoV‐2
Authors: Li Sijie , Huang Shiyi , Ke Yuqing , Chen Hongjun , Dang Jingqi , Huang Chengjie , Liu Wenjia , Cui Daxiang , Wang Jinglin , Zhi Xiao , Ding Xianting 
Published: April 2021

AbstractNowadays, the main obstacle for further miniaturization and integration of nucleic acids point‐of‐care testing devices is the lack of low‐cost and high‐performance heating materials for supporting reliable nucleic acids amplification. Herein, reduced graphene oxide hybridized multi‐walled carbon nanotubes nano‐circuit integrated into an ingenious paper‐based heater is developed, which is integrated into a paper‐based analytical device (named HiPAD). The coronavirus disease 2019 (COVID‐19) pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) is still raging across the world. As a proof of concept, the HiPAD is utilized to visually detect the SARS‐CoV‐2 N gene using colored loop‐mediated isothermal amplification reaction. This HiPAD costing a few dollars has comparable detection performance to traditional nucleic acids amplifier costing thousands of dollars. The detection range is from 25 to 2.5 × 1010 copies mL−1 in 45 min. The detection limit of 25 copies mL−1 is 40 times more sensitive than 1000 copies mL−1 in conventional real‐time PCR instruments. The disposable paper‐based chip could also avoid potential secondary transmission of COVID‐19 by convenient incineration to guarantee biosafety. The HiPAD or easily expanded M‐HiPAD (for multiplex detection) has great potential for pathogen diagnostics in resource‐limited settings.
A Highly Sensitive, Reversible, and Bidirectional Humidity Actuator by Calcium Carbonate Ionic Oligomers Incorporated Poly(Vinylidene Fluoride)
Authors: He Yan , Kong Kangren , Guo Zhengxi , Fang Weifeng , Ma Zaiqiang , Pan Haihua , Tang Ruikang , Liu Zhaoming 
Published: April 2021

AbstractSensitivity and multi‐directional motivation are major two factors for developing optimized humidity‐response materials, which are promising for sensing, energy production, etc. Organic functional groups are commonly used as the water sensitive units through hydrogen bond interactions with water molecules in actuators. The multi‐coordination ability of inorganic ions implies that the inorganic ionic compounds are potentially superior water sensitive units. However, the particle forms of inorganic ionic compounds produced by classical nucleation limit the number of exposed ions to interact with water. Recent progress on the inorganic ionic oligomers has broken through the limitation of classical nucleation, and realized the molecular‐scaled incorporation of inorganic ionic compounds into an organic matrix. Here, the incorporation of hydrophilic calcium carbonate ionic oligomers into hydrophobic poly(vinylidene fluoride) (PVDF) is demonstrated. The ultra‐small calcium carbonate oligomers within a PVDF film endow it with an ultra‐sensitive, reversible, and bidirectional response. The motivation ability is superior to other bidirectional humidity‐actuators at present, which realizes self‐motivation on an ice surface, converting the chemical potential energy of the humidity gradient from ice to kinetic energy.
Woolen Respirators for Thermal Management
Authors: Iqbal Mohammad Irfan , Shuo Shi , Jiang Yuanzhang , Fei Bin , Xia Qingyou , Wang Xin , Hu Wenbo , Hu Jinlian 
Published: April 2021

AbstractCOVID‐19 pandemic recently has a great impact on personalized protection and healthcare, especially in the area of the respiratory mask. However, due to the complex relationship between filtration performance and thermal management, there is a lack of investigation considering both characters in respirators. Woolen knitwears are recently well acknowledged as textiles for both hot and cold because of their superior water‐actuated shape memory performance. To incorporate protective function against bacteria, virus, microdroplet, and particulate matter, melt‐blown polypropylene can be introduced as a barrier layer. Herein, a robust and sustainable bio‐based woolen respirator with the superior ability of thermal management is prepared using simple knitting and melt‐blown technology. The as‐prepared respirators provide excellent protection from airborne particulate along with the high level of comfort, compared with a commercial mask. Moreover, it exhibits a high rating during wear trial. This provides a new insight to develop high quality sustainable respiratory mask with an excellent comfort performance from functional biomaterials.
Palladium‐Catalyzed Tandem γ‐Arylation/Aromatization of Cyclohex‐2‐En‐1‐One Derivatives: A Route to 3,4‐Dihydroanthracen‐1(2H)‐Ones
Authors: Song Yi‐Kang , Xu Si‐Yu , Zhang Shu‐Sheng , Fu Jian‐Guo , Lin Guo‐Qiang , Feng Chen‐Guo 
Published: April 2021

AbstractAn intramolecular palladium‐catalyzed tandem γ‐arylation/aromatization reaction of cyclohex‐2‐en‐1‐one derivatives was developed. This work provides a simple and efficient approach for the construction of substituted 3,4‐dihydroanthracen‐1(2H)‐ones in good yields with a broad substrate scope.magnified image
Copper(0) nanoparticle catalyzed Z‐Selective Transfer Semihydrogenation of Internal Alkynes
Authors: Moran Maria Jesus , Martina Katia , Bieliunas Vidmantas , Baricco Francesca , Tagliapietra Silvia , Berlier Gloria , De Borggraeve Wim M. , Cravotto Giancarlo 
Published: April 2021

AbstractThe use of copper(0) nanoparticles in the transfer semihydrogenation of alkynes has been investigated as a lead‐free alternative to Lindlar catalysts. A stereo‐selective methodology for the hydrogenation of internal alkynes to the corresponding (Z)‐alkenes in high isolated yields (86% average) has been developed. This green and sustainable transfer hydrogenation protocol relies on non‐noble copper nanoparticles for reduction of both electron‐rich and electron‐deficient, aliphatic‐substituted and aromatic‐ substituted internal alkynes. Polyols, such as ethylene glycol and glycerol, have been proven to act as hydrogen sources, and excellent stereo‐ and chemoselectivity have been observed. Enabling technologies, such as microwave and ultrasound irradiation are shown to enhance heat and mass transfer, whether used alone or in combination, resulting in a decrease in reaction time from hours to minutes.magnified image
Noncanonical Heme Ligands Steer Carbene Transfer Reactivity in an Artificial Metalloenzyme**
Authors: Pott Moritz , Tinzl Matthias , Hayashi Takahiro , Ota Yusuke , Dunkelmann Daniel , Mittl Peer R. E. , Hilvert Donald 
Published: April 2021

AbstractChanging the primary metal coordination sphere is a powerful strategy for tuning metalloprotein properties. Here we used amber stop codon suppression with engineered pyrrolysyl‐tRNA synthetases, including two newly evolved enzymes, to replace the proximal histidine in myoglobin with Nδ‐methylhistidine, 5‐thiazoylalanine, 4‐thiazoylalanine and 3‐(3‐thienyl)alanine. In addition to tuning the heme redox potential over a >200 mV range, these noncanonical ligands modulate the protein's carbene transfer activity with ethyl diazoacetate. Variants with increased reduction potential proved superior for cyclopropanation and N–H insertion, whereas variants with reduced Eo values gave higher S–H insertion activity. Given the functional importance of histidine in many enzymes, these genetically encoded analogues could be valuable tools for probing mechanism and enabling new chemistries.
Programming Fluorogenic DNA Probes for Rapid Detection of Steroids
Authors: Ebrahimi Sasha B. , Samanta Devleena , Partridge Benjamin E. , Kusmierz Caroline D. , Cheng Ho Fung , Grigorescu Arabela A. , Chávez Jorge L. , Mirau Peter A. , Mirkin Chad A. 
Published: April 2021

AbstractThe ability of aptamers to recognize a variety of different molecules has fueled their emergence as recognition agents to probe complex media and cells. Many detection strategies require aptamer binding to its target to result in a dramatic change in structure, typically from an unfolded to a folded state. Here, we report a strategy based on forced intercalation (FIT) that increases the scope of aptamer recognition by transducing subtle changes in aptamer structures into fluorescent readouts. By screening a library of green‐fluorescent FIT‐aptamers whose design is guided by computational modeling, we could identify hits that sense steroids like dehydroepiandrosterone sulfate (DHEAS) down to 1.3 μM with no loss in binding affinity compared to the unmodified aptamer. This enabled us to study DHEAS in clinical serum samples with several advantages over gold standard methods, including rapid readout (<30 min), simple instrumentation (plate‐reader), and low sample volumes (10 μL).
An All‐in‐One Organic Semiconductor for Targeted Photoxidation Catalysis in Hypoxic Tumor
Authors: Chen Weihua , Sun Zhen , Jiang Chunhuan , Sun Wenbo , Yu Bin , Wang Wei , Lu Lehui 
Published: April 2021

AbstractTumor hypoxia severely limits the therapeutic effects of photodynamic therapy (PDT). Although many methods for oxygen generation exist, substantial safety concerns, spatiotenporal uncontrollability, limited efficacy, and complicated procedures have compromised their practical application. Here, we demonstrate a biocompatiable all‐in‐one organic semiconductor to provide a photoxidation catalysis mechanism of action. A facile method is developed to produce gram‐level C5N2 nanoparticles (NPs)‐based organic semiconductor. Under 650 nm laser irradiation, the semiconductor split water to generate O2 and simultaneously produce singlet oxygen (1O2), showing that the photocatalyst for O2 evolution and the photosensitizer (PS) for 1O2 generation could be synchronously achieved in one organic semiconductor. The inherent nucleus targeting capacity endows it with direct and efficient DNA photocleavage. These findings pave the way for developing organic semiconductor‐based cancer therapeutic agents.