bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estudo exploratório sobre o uso da Robótica Educacional no ensino de introdução a programação
Authors: Dargains André Rachman , Sampaio Fábio Ferrentini 
Published: March 2021

Este trabalho é um estudo exploratório que se apoia em três pilares na busca por um melhor ensino de programação: a robótica educativa, a abordagem construcionista e a Taxonomia de Bloom revisada, com o intuito de identificar métodos e estratégias para o crescimento da qualidade do ensino de programação introdutória. Para isso, duas aplicações foram realizadas com alunos de ensino médio em escolas públicas do Rio de Janeiro, e seus resultados analisados e comparados com uma disciplina de programação oferecida por uma universidade federal local. Espera-se, com esse estudo, a possibilidade de construir novas propostas e identificar caminhos para o fomento da educação em ciência, tecnologia, engenharia e matemática em escolas públicas brasileiras
Rodas de Invenções
Authors: Lederman Simone Kubric , Rocci Paola Salmona , Camargo Rita Junqueira de , Rocha Naima D'Auria 
Published: March 2021

As Rodas de Invenções são experiências de criatividade participativa que mobilizam a imaginação articulando: leitura de histórias instigantes, exploração mão na massa de materiais selecionados, construção de artefatos, criação e compartilhamento de novas narrativas. A proposta catalisa Aprendizagem Criativa, em sintonia com a pesquisa de Mitchel Resnick, desdobrada a partir do Construcionismo, inaugurado por Seymour Papert. Neste artigo compartilharemos pressupostos teóricos e experiências práticas que contribuíram para o surgimento das Rodas de Invenções, apresentaremos a essência de sua estrutura (framework) e, também, o Kit Catalisador, sustentável e aberto, desenhado para que outros educadores possam mediar rodas e remixá-las em seus contextos. A proposta é ilustrada pelo relato de um ciclo de Rodas realizado no Mirante Cultural (Pirituba, São Paulo-SP).
Palavras-chave: Aprendizagem Criativa; Construcionsimo; Educação Mão na Massa; Narrativas; Cidade Educadora.
Transformational leadership and patient safety in hospital
Authors: Tangatarova Shahrizada , Gao Yongqiang 
Published: March 2021

This study examines to make up this significant gap in the existing literature. Using a cross-sectional sample consisting of 240 nurses in the hospitals of Uzbekistan and a structural model, with a random sampling technique by employing explanatory, and causal design was used to test the developed framework. Quantitative data was collected using questionnaires, the survey instruments were distributed by hand among the private and public sector, we find that nurses’ perceived safety culture (SC) and decision-making capacity (DMC) act as important mechanisms linking TL to PS. Meanwhile, nurses’ perceived locus of control (LC) moderates the effect of TL on SC and DMC in such a way that this effect is more salient for nurses with internal LC than for nurses with external LC. This paper examines the contribution, that individuals with high internal LC are more affected by TL, generate and can better develop SC and DMC. The study findings demonstrated the significant role of transformational leadership played in order to improve working conditions and the environment, which helps nurses to create good conditions, relationships with patients and increase patient safety. The theoretical and practical implications of this study are discussed
Avaliação da Refrigeração de Corte Criogênica na Usinagem CNC do Aço Inoxidável Martensítico AISI 420
Authors: Dacas Fernando Prando , COSTA Rodrigo 
Published: March 2021

A utilização de materiais com difícil usinabilidade, como aços inoxidáveis, tem crescimento constantemente nos setores industriais aeroespacial, biomedicina, alimentícia e naval. O calor gerado durante operações de usinagem tem relação direta com o parâmetro de corte, e sendo adotada a alta temperatura, impõe-se limitações para aumento da produtividade. O calor gerado é dissipado em todos os elementos envolvidos, acelerando o processo desgaste da aresta de corte. Este estudo analisou um método mais eficiente para refrigeração de corte, por meio do desenvolvimento de um trocador de calor para resfriar o fluido, no caso, ar comprimido tratado com nitrogênio líquido. Para testes de usinagem foram fixados parâmetros de corte, tempo de usinagem, e variado o método de refrigeração de corte entre a seco e com ar comprimido refrigerado. A refrigeração de corte criogênica ocorreu em temperatura inferior a -20°C, onde o jato de ar comprimido refrigerado e o vapor de nitrogênio do reservatório foram direcionados para o flanco do inserto. Os dados experimentais demonstram que a refrigeração de corte criogênica promoveu redução de desgaste da aresta de corte, na usinagem de torneamento externo do aço inoxidável martensítico AISI 420, no estado de temperado e revenido, com dureza de 35HRC. Também foi observada uma estabilização de integridade superficial, relacionada diretamente com a redução na temperatura interna do inserto. A refrigeração de corte criogênica não promoveu alterações microestruturais do material usinado. Conclui-se pela viabilidade técnica do método de refrigeração criogênica, dado o aumento na vida útil do inserto, e a redução do passivo ambiental.
Ultra-streamlined single cell proteomics by all-in-one chip and data-independent-acquisition mass spectrometry
Authors: Tu Hsiung-Lin , Gebreyesus Sofani , Siyal Asad Ali , Kitata Reta Birhanu , Chen Eric Sheng-Wen , Enkhbayar Bayarmaa , Angata Takashi , Lin Kuo-I , Chen Yu-Ju 
Published: March 2021

Abstract
Single cell proteomics provides the ultimate resolution to reveal cellular phenotypic heterogeneity and functional network underlying biological processes. Here, we present an ultra-streamlined workflow combining an integrated proteomic chip (iProChip) and data-independent-acquisition (DIA) mass spectrometry for sensitive microproteomics analysis down to single cell level. The iProChip offers multiplexed and automated all-in-one station from cell isolation/counting/imaging to complete proteomic processing within a single device. By mapping to project-specific spectra libraries, the iProChip-DIA enables profiling of 1160 protein groups from triplicate analysis of a single mammalian cell. Furthermore, the applicability of iProChip-DIA was demonstrated using both adherent and non-adherent malignant cells, which reveals 5 orders of proteome coverage, highly consistent ~100-fold protein quantification (1-100 cells) and high reproducibility with low missing values (<16%). With the demonstrated all-in-one cell characterization, ultrahigh sensitivity, robustness, and versatility to add other functionalities, the iProChip-DIA is anticipated to offer general utility to realize advanced proteomics applications at single cell level.
Surface water quality assessment using hybrid multivariate statistical analysis and geographic information system based on integrated water quality index model for Maozhou River Basin, Guangdong, China
Authors: Lin Tao , Yu Huiqing , Wang Qi , Hu Lin , Yin Jing 
Published: March 2021

Abstract
The river is a vital component of the water ecosystem in both urban and rural regions. However, its rapidly increasing pollutants are posing a severe threat for water ecosystem security. Using Multivariate statistical technique and Integrated water quality index model (IWQI) to evaluate surface water quality and its spatial distribution based on Geographic information system (GIS). This combinatorial model have been proved to be a feasible tool for evaluating surface water quality at large-scale basin. This study analyzed the spatio-temporal variations of surface water quality, which were determined monthly from samples collected in the Maozhou River Basin Guangdong Province, China from 2018 to 2020. The results demonstrated that the surface water quality status of in the Maozhou River Basin has been steadily improved during the study period. The surface water quality of 82.17% of monitoring site reached the water quality target of function zones (surface water quality of the class V standards), with the IWQI values ranging from 12.118 to 3.650. By the end of 2019, black-odorous water in Maozhou River basin has disappeared from our sight. By 2020, the water quality status of the Maozhou River Basin has been steadily maintained at “Medium and good” level, and the main background pollutants for the water quality target of function zones is NH3-N. However, the some area in which the surface water quality still need to further improve is estuary and southwest tributary in the basin. This finding calls for further efforts to improve surface water quality and to properly deal with various sources of pollution in the watershed. It is concluded that this combined surface water quality evaluation model is more efficient and reasonable for surface water quality evaluation at a larger scale. It can provide scientific foundation for the water ecosystem management and planning in efficiently managing and evaluating surface water quality at river or basin scales.
Response of black gram to seed biopriming with facultative halophilic bacteria under salinity&nbsp;
Authors: Nagaraju Yalavarthi , swamy Mahadeva , Gundappagol R.C. , Naik Nagaraj M , Rao K. Narayana 
Published: March 2021

Abstract
Under high salinity conditions, plant growth promoting halophilic bacteria (PGPHB) can thrive and greatly encourage plant growth. The use of PGPHB is minimal and less discussed in sustainable agriculture and abiotic stress control. The focus of the current investigation is to improve the growth of black gram by inoculating with of halophilic bacteria under salinity stress. Four PGPHB bacteria, viz., Bacillus safensis strain Lewis_Bac_3 (HB-5), Pseudomonas stutzeri strain MN1 (HB-13), Staphylococcus xylosus strain C5 (HB-18) and Pseudomonas sp. (GP-21: reference strain) were inoculated to black gram seeds to evaluate their plant growth promoting ability at 4 dS m-1 and pH >8.5. Increase in root length, plant height, and number of branches have been reported in consortium treatment (T8), indicating that salinity does not affected black gram photosynthesis and nutrient absorption in consortium treatment. Corroborating evidence revealed higher nodulation and total nitrogen and phosphorous content in the same treatment, in comparison with control. Due to salinity stress, decreased blooming was reported in control, conversely, consortium treatment showed 29.3 flowers/plant. A positive correlation with yield was demonstrated by number of pods and seeds per pod of black gram. In addition, there is a strong association between pods per plant and the amount of flowers per plant, nutrient content, and length of root. The decrease in control plot yield was due to shoot and root development resulting from insufficient nutrients availability. In this study we also found positive correlation between % P in plant and yield. Hence, we conclude that PGPH bacteria helps in the reduction of salt stress and significantly increase black gram growth and yield under mild salinity stress.
Hybrid Speech Steganography System using SS-RDWT with IPDP-MLE approach
Authors: Rayudu Chinnarao , P.V.Y. Jayasree , S. Srinivasa Rao 
Published: March 2021

Abstract
In the last two decades, it has been observed that there have been remarkable advancements in digital media communication. It has lots of advantages and business potential as it needs no physical media or transport. However, digital media can also create several big problems for media owners due to unauthorized use, ease of replication, plasticity, and equivalence of works in digital form. The possible solution is to secure digital media by cover writing which can also referred as steganography. Therefore, this article focusing on development of hybrid speech steganography system using spread spectrum-based redundant discrete wavelet transform (SS- RDWT). In general, speech steganography utilizes cover speech to embed the secrete message, however, the cover speech might be larger in size and contains many pauses, which requires more storage capacity, higher computational time, and even higher power usage results in system performance degradation. Hence, in addition to the proposed SS-RDWT approach, an intelligent pause detection protocol (IPDP) with maximum likelihood estimation (MLE) technique is employed for removing pause from cover speech signal, which reduces the transmission bandwidth, storage capacity and power consumption as well. Simulation results demonstrate that proposed hybrid steganography using integrated SS-RDWT with IPDP-MLE approach obtained superior performance as compared to state-of-art approaches.
Identification of viruses infecting cigar and flue-cured tobacco using next generation sequencing and establishment of multiplex RT-PCR
Authors: Zhou Tao , Zhou Shidong , Chen Yong , Wang Jun , Zhang Ruina , Xiang Huan , Xia Zihao , An Mengnan , Zhao Xiuxiang , Wu Yuanhua 
Published: March 2021

Abstract
Backgrounds: Infection of plant viruses cause extensive damage to plants and reduce crop yield. Early, precise and simultaneous identification of the plant viruses is of great significance on preventing the spread of the viruses as well as reducing losses on agricultural yield.Methods: Identification of plant viruses from symptomatic samples collected from cigar tobacco planting area in Deyang and flue-cured tobacco planting area in Luzhou city of Sichuan Province China was conducted by the deep sequencing of small RNAs (sRNAs) through an Illumina sequencing platform and plant virus specific contigs were generated based on the virus derived siRNA sequences. Additionally, sequence alignment and phylogenetic analysis was performed to determine the species or strains of these viruses. Subsequently, specific primers were designed for simultaneous detection of five RNA viruses infecting tobacco.Results: A total of 27930450, 21537662 and 28194021 clean reads were generated from three pooled samples and a total of 105 contigs that can be mapped to the closest plant viruses with the length range from 34~1720 nt. The results indicated that the major viruses were potato virus Y (PVY), Chilli veinal mottle virus (ChiVMV), tobacco vein banding mosaic virus (TVBMV), tobacco mosaic virus (TMV) and cucumber mosaic virus (CMV). A fast and sensitive multiplex reverse transcription polymerase chain reaction (RT-PCR) assay was developed for the simultaneous detection of the most frequent RNA viruses infecting cigar and flue-cured tobacco in Sichuan.Conclusion: These results provide theoretical basis and convenient methods for rapid detection and control of viruses on cigar and flue-cured tobacco.
The expansion of the Universe may be an illusion created by Compton scattering of free electrons
Authors: Cheng GuanFeng 
Published: March 2021

Abstract
The two most precise gauges of the Universe’s expansion rate have recently been in glaring disagreement. The measurement of the Hubble parameter makes the Universe expansion theory more and more confusing, the cosmological redshift may not only be related to distance but also to other factors, and the expansion of the Universe may be just an illusion. The Compton effect of free electrons and low energy photons has been observed in the laboratory. This paper presents a theory: Free electron Compton scattering (FEC) may produce the illusion of the Universe expansion: Photons interact with a large number of free electrons on their way to us from a distant source. FEC causes photons to redshift (FEC redshift), and the photon beam expands along the propagation direction, these may produce the illusion of cosmic expansion (FEC cosmic model). FEC redshift is independent of wavelength, and proportional to distance and corresponding electron density, consistent with the Doppler effect of the expansion of the Universe. Flare redshift is a common phenomenon, and it is difficult to use the Doppler effect to explain alone, there is evidence of FEC redshift in flare redshift.
Low Complexity Non Maximally Coefficient Symmetry Multi Rate Filter Bank for Wideband Channelization
Authors: Vaidya Kirti Samir , C.G Dethe , Akojwar S. G. 
Published: March 2021

Abstract
For extracting the individual channels from input signal of wideband, Software Radio Channelizer was often used on multi-standard wireless communication. Despite the effective channelizer design that decreases the complexity of computational, delay and power consumption is challenging. Thus, to promote the effectiveness of the channelizer, we have provided the Non-Maximally Coefficient Symmetry Multirate Filter Bank. For this, a sharp wideband channelizer is designed to be using the latest class of masking responses with Non-maximally Decimated Polyphase Filter. Moreover, coefficient symmetry is incorporated into the Non-Maximally Coefficient Symmetry Multirate Filter Bank to improve the hardware efficiency and functionality of the proposed schemes. To prove the complexity enhancement of the proposed system, the design is analyzed with communication standard with existing methods.
Asymptotic analysis of the SIR model. Applications to COVID-19 modelling
Authors: Prodanov Dimiter 
Published: March 2021

Abstract
The SIR (Susceptible-Infected-Removed) model can be very useful in modelling epidemic outbreaks. The present paper derives the parametric solution of the model in terms of quadratures. The paper demonstrates a simple analytical asymptotic solution for the I-variable, which is valid on the entire real line. Moreover, the solution can be used successfully for parametric estimation either in stand-alone mode or as a preliminary step in the parametric estimation using numerical inversion of the parametric solution. The approach is applied to the ongoing coronavirus disease 2019 (COVID-19) pandemic in three European countries --Belgium, Italy and Sweden.
Energy Intensity Determinants Based on Structure-oriented Cointegration by Embedding a Knowledge Box in a Time Series Model: Evidence From Iran
Authors: Esmaeili Parisa , Rafei Meysam 
Published: March 2021

Abstract
Energy intensity reduction is an exigent issue for Iran, where energy consumption is so high. Therefore, finding effective policies to reduce energy intensity is important. With this in mind, the impact of financial development, government investment, oil revenues, and trade openness on energy intensity is assessed in this study. We combined Structural Vector Error Correction Model (SVECM) and Directed Acyclic Graphs (DAG) technique to examine the relationships between study variables. The results of DAG prove that financial development, government investment, oil revenues, and trade openness influence the intensity of energy. Besides, the significant and long-run relationships among variables allowed us to apply SVECM. Impulse response functions and variance decomposition analysis indicate that government investment, oil revenues, and trade openness are negatively associated with the intensity of energy. Also, financial development positively influences energy intensity. Meanwhile, the impact of government investment is greater than oil revenues, trade openness, and financial development impacts. So, Government investment is the most effective policy regarding optimizing the consumption of energy and reducing energy intensity. We also advise policymakers to use oil revenues to increase government investment, enhancing the level of trade openness, and tax to the private sector to improve the level of energy intensity.
TNFɑ-induced LDL cholesterol accumulation involve elevated LDLR cell surface levels and SR-B1 downregulation in human arterial endothelial cells
Authors: Okoro Emmanuel Ugochukwu 
Published: March 2021

Abstract
Excess lipid droplets are frequently observed in arterial endothelial cells at sites of advanced atherosclerotic plaques. Here, the role of tumor necrosis factor alpha (TNFɑ) in modulating low density lipoprotein (LDL) content in confluent primary human aortic endothelial cells (pHAECs) was investigated. TNFɑ promoted up to 2 folds increase in cellular cholesterol, which was resistant to ACAT inhibition. The cholesterol increase was associated with increased 125I-LDL surface binding. Using the non-hydrolysable label, Dil, TNFɑ could induce a massive increase in Dil-LDL by over 200 folds. The elevated intracellular Dil-LDL was blocked with excess unlabeled LDL and PCSK9, but not oxidized LDL (oxLDL), receptor associated protein (RAP), or apolipoprotein (apoE) depletion. Moreover, TNFɑ-induced increase of LDL-derived lipids was elevated through lysosome inhibition. Using specific LDLR antibody, the Dil-LDL accumulation was reduced by over 99%. Effects of TNFɑ included LDLR cell surface increase by 138%, and very large increases in ICAM-1 total and surface proteins, respectively. In contrast, that of scavenger receptor B1 (SR-B1) was reduced. Additionally, LDLR antibody bound rapidly in TNFɑ-treated cells by about 30 folds, inducing a migrating shift in the LDLR protein. The effect of TNFɑ on Dil-LDL accumulation was inhibited by the antioxidant tetramethythiourea (TMTU) dose-dependently, but not by inhibitors against NF-κB, stress kinases, ASK1, JNK, p38, or apoptosis caspases. Grown on transwell inserts, TNFɑ did not enhance apical to basolateral LDL cholesterol or Dil release. It is concluded that TNFɑ promotes LDLR functions through combined increase at the cell surface and SR-B1 downregulation.
Electromagnetic Induced Transparency and Slow light in Plasmonic Metasurfaces
Authors: Khan Haseeb Ahmad , Shah Syed Waqar , Khan Adnan Daud 
Published: March 2021

Abstract
We report numerically electromagnetic-induced transparency (EIT) and Fano resonances in simple plasmonic metasurfaces consist of gold nanobars arranged in Pi, H and four shaped fashion. The bright and dark elements in the metasurfaces are responsible for the emergence of EIT and Fano effects in the transmission spectrum. The concept of symmetry breaking is also introduced by incorporating multiple cavities in the metasurface, which relaxes the dipole coupling selection rules resulting in a mixture of dipole and higher order modes that interact and engenders EIT and Fano modes simultaneously in a nanostructure. Furthermore, the EIT and Fano resonances experience a significant red-shift by increasing the refractive index of the background medium due to which high sensitivity of around 574 nmRIU -1 , figure of merit of 32, and contrast ratio of 41% are realized. Moreover, the effective group index of the proposed metasurface is retrieved and is observed to be very high around the steep asymmetric Fano line shape and within the EIT window, signifying its potential use in slow light applications.