bluuebunny/crossref_metadata_2025 huggingface dataset:
Implementation and Evaluation of Vision-Based Sensor Image Compression for Close-Range Photogrammetry and Structural Health Monitoring
Authors: Ngeljaratan Luna , Moustafa Mohamed A.
Published: November 2020

Much research is still underway to achieve long-term and real-time monitoring using data from vision-based sensors. A major challenge is handling and processing enormous amount of data and images for either image storage, data transfer, or image analysis. To help address this challenge, this study explores and proposes image compression techniques using non-adaptive linear interpolation and wavelet transform algorithms. The effect and implication of image compression are investigated in the close-range photogrammetry as well as in realistic structural health monitoring applications. For this purpose, images and results from three different laboratory experiments and three different structures are utilized. The first experiment uses optical targets attached to a sliding bar that is displaced by a standard one-inch steel block. The effect of image compression in the photogrammetry is discussed and the monitoring accuracy is assessed by comparing the one-inch value with the measurement from the optical targets. The second application is a continuous static test of a small-scale rigid structure, and the last application is from a seismic shake table test of a full-scale 3-story building tested at E-Defense in Japan. These tests aimed at assessing the static and dynamic response measurement accuracy of vision-based sensors when images are highly compressed. The results show successful and promising application of image compression for photogrammetry and structural health monitoring. The study also identifies best methods and algorithms where effective compression ratios up to 20 times, with respect to original data size, can be applied and still maintain displacement measurement accuracy.
LPCF: Robust Correlation Tracking via Locality Preserving Tracking Validation
Authors: Zhou Yixuan , Zhang Weimin , Shi Yongliang , Wang Ziyu , Li Fangxing , Huang Qiang
Published: November 2020

In visual tracking, the tracking model must be updated online, which often leads to undesired inclusion of corrupted training samples, and hence inducing tracking failure. We present a locality preserving correlation filter (LPCF) integrating a novel and generic decontamination approach, which mitigates the model drift problem. Our decontamination approach maintains the local neighborhood feature points structures of the bounding box center. This proposed tracking-result validation approach models not only the spatial neighborhood relationship but also the topological structures of the bounding box center. Additionally, a closed-form solution to our approach is derived, which makes the tracking-result validation process could be accomplished in only milliseconds. Moreover, a dimensionality reduction strategy is introduced to improve the real-time performance of our translation estimation component. Comprehensive experiments are performed on OTB-2015, LASOT, TrackingNet. The experimental results show that our decontamination approach remarkably improves the overall performance by 6.2%, 12.6%, and 3%, meanwhile, our complete algorithm improves the baseline by 27.8%, 34.8%, and 15%. Finally, our tracker achieves the best performance among most existing decontamination trackers under the real-time requirement.
Separation of Benzene/Cyclohexane Mixtures by Pervaporation Using Poly (Ethylene-Co-Vinylalcohol) and Carbon Nanotube-Filled Poly (Vinyl Alcohol-Co-Ethylene) Membranes
Authors: Zahlan Hala , Saeed Waseem Sharaf , Alqahtani Saad , Aouak Taieb
Published: November 2020

Poly(ethylene-co-vinylalcohol) (E-VOH) and carbon nanotube-filled poly (vinyl alcohol-co-ethylene) (E-VOH/CNT) were used as membranes to separate benzene/cyclohexane mixtures by pervaporation technique. To reach this goal, E-VOH and E-VOH/CNT membranes were prepared by solvent casting method and characterized by differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The swelling tests were used to study the mass transfer of the benzene/cyclohexane mixture and their pure components. The separation by pervaporation process was carried out at 25 °C in which the effect of CNTs incorporated into E-VOH matrix and the initial concentration of benzene in the feed on the permeate flux, j, and separation factor, β, performance was investigated. The results obtained were very promising, in which the integration of CNTs through E-VOH chains increased the absorption area and raised the flux to 740 g/m2∙h. The separation factor increased to 9.03 and the pervaporation separation reached an index of 5942.2 g/m2∙h for the azeotropic mixture during 3 h of the separation process. In contrast, for the unfilled E-VOH membrane, it was found that these parameters were a rise of 280 g∙m−2∙h−1, separation factor of 12.90 and pervaporation separation index of 3332.0 g/m2∙h, under the same conditions. Likewise, the calculation of the performance of the E-VOH/CNT membrane with regard to that of the unfilled membrane indicated 2.64 for the total flux and 0.70 for the separation factor. It was also revealed that the best compromise of the filled membrane in terms of total cumulative flux and separation factor is obtained for the feed containing the azeotropic mixture.
Self-Selected Versus Standardised Warm-Ups; Physiological Response on 500 m Sprint Kayak Performance
Authors: Dingley Amelia F. , Willmott Alexander P. , Fernandes John F. T.
Published: November 2020

This study investigated the effectiveness of a self-selected (SS) warm-up on 500 m sprint kayak performance (K500) compared to continuous (CON) and intermittent high intensity (INT)-type warm-ups. Twelve nationally ranked sprint kayakers (age 17.7 ± 2.3 years, mass 69.2 ± 10.8 kg) performed CON (15 min at the power at 2 m·mol−1), INT (10 min at 2 m·mol−1, followed by 5 × 10 s sprints at 200% power at VO2max with 50 s recovery at 55% power at VO2max), and SS (athlete’s normal competition warm-up) warm-ups in a randomised order. After a five-minute passive recovery, K500 performance was determined on a kayak ergometer. Heart rate and blood lactate (BLa) were recorded before and immediately after each warm-up and K500 performance. Ratings of perceived exertion (RPE) were recorded at the end of the warm-up and K500. BLa, heart rate, and RPE were generally higher after the INT than CON and SS warm-ups (p < 0.05). No differences in these parameters were found between the conditions for the time trial (p > 0.05). RPE and changes in BLa and heart rate after the K500 were comparable. There were no differences in K500 performance after the CON, SS, or INT warm-ups. Applied practitioners can, therefore, attain similar performance independent of warm-up type.
Impact of Sustainability on Firm Value and Financial Performance in the Air Transport Industry
Authors: Abdi Yaghoub , Li Xiaoni , Càmara-Turull Xavier
Published: November 2020

In this study, we examine the extent to which the implementation of environmental, social, and governance (ESG) disclosures influence the firm value and financial performance of airlines. The panel data analysis is applied to the set of collected data from the Thomson Reuters Eikon database for the sample of 27 airlines worldwide from 2013 to 2019. Findings of this study support the positive relationship between the environmental pillar score (Env) and governance pillar score (Gov), with market-to-book ratio and Tobin’s Q as proxies for firm value and financial performance, respectively. This finding implies that an increase in both pillars leads to higher market value and financial efficiency for investigated airlines. Therefore, an airline’s effort to improve Env and Gov dimensions will lead to higher market value and return on invested funds. In contrast, the social pillar disclosure in both models is found to have a significant negative association with the dependent variables, showing that airlines’ social activities result in lower value as well as level of performance.
Introducing an Organizational Perspective in SDG Implementation in the Public Sector in Spain: The Case of the Former Ministry of Agriculture, Fisheries, Food and Environment
Authors: Soberón Miguel , Sánchez-Chaparro Teresa , Urquijo Julia , Pereira David
Published: November 2020

The public sector has an indisputable role in the implementation of the Sustainable Development Goals (SDGs). However, the interrelated nature of the SDGs represents a challenge for the public sector, which has in the last few decades undergone a process of specialization, decentralization and fragmentation. Hence, the establishment of coordination mechanisms within the public sector are needed to ensure implementation. This article introduces an organizational perspective in a participative SDG prioritization process carried out by a public organization: the former Spanish Ministry of Agriculture, Fisheries, Food and Environment (MAPAMA). A case study methodology is used to identify internal collaboration needs in order to address the SDGs and to analyze the driving and restraining forces operating within the organization so that the required organizational changes can be initiated. Our findings reveal that the organizational perspective is key in supporting SDG implementation and boosting the transformative capacity that underpins the 2030 Agenda. Public organizations must combine different coordination approaches, according to the demands that each specific SDG target makes upon the organization. Furthermore, engaging internal agents in participative processes for the development of the implementation is essential to reproducing the dynamics of internal collaboration that will be needed in future stages of the adoption of the 2030 Agenda.
Can the Adoption of Protected Cultivation Facilities Affect Farm Sustainability?
Authors: Liao Pei-An , Liu Jhih-Yun , Sun Lih-Chyun , Chang Hung-Hao
Published: November 2020

Given the increasing threat of climate change to agriculture, determining how to achieve farm sustainability is important for researchers and policy makers. Among others, protected cultivation has been proposed as a possible adaptive solution at the farm level. This study contributes to this research topic by quantifying the effects of the use of protected cultivation facilities on farm sustainability. In contrast to previous studies that relied on small-scale random surveys, a population-based sample of fruit, flower and vegetable farms was drawn from the Agricultural Census Survey in Taiwan. Propensity score matching, inverse probability weighting and inverse probability weighting regression adjustment methods were applied. Empirical results show that the use of protected cultivation facilities increases farm profit by 68–73%, other things being equal. This finding is persistent when farms suffer from disaster shocks. Moreover, the changes in farm labor use can be seen as a mechanism behind the positive effect of the protected cultivation facility use on farm profit. Our findings suggest that agricultural authority can consider subsidizing farms to increase the adoption of protected cultivation facilities to mitigate the risks resulting from natural disaster shocks.
A Bibliometric Analysis of Online Reviews Research in Tourism and Hospitality
Authors: Muritala Babajide Abubakr , Sánchez-Rebull Maria-Victoria , Hernández-Lara Ana-Beatriz
Published: November 2020

This paper reviews the literature on online reviews in tourism and hospitality, and presents the current state of research in the area. A bibliometric approach was used to analyze 632 journal articles on online reviews in tourism and hospitality from 2005 to 2019 from the Scopus Database. This study identifies the most prolific journals, foundational works, and major research themes in the research area. In addition, we analyzed some dimensions of their network structure and the thematic evolution of the research area. The bibliometric method is quantitative and objective, and we carry out an analysis of the area based on citations and keywords. Researchers and business managers can gain useful insights on the current state of the art in this area. There have been only a few literature reviews tracking the growth in this research area, and even fewer using bibliometric methods or science maps. Therefore, this work provides an updated review of this fast-growing area with a bibliometric approach to highlight the recent developments with the aid of science maps, and shows the thematic network structure and evolution with an innovative visualization.
Towards Enhanced Transparency in Non-Annex 1 Countries? Challenges and Options for Measurement and Reporting in Georgia
Authors: Gladov Sophie Louise , Nathan Iben , Pedersen Morten
Published: November 2020

This paper explores what the main challenges are for Georgia and other non-Annex 1 countries to meet the requirements under the Paris Agreement’s Enhanced Transparency Framework, and discusses what the options are for overcoming these challenges. The paper draws on primary data from Georgia’s energy sector and on case-based literature from various non-Annex 1 countries. The literature points to challenges such as insufficient budgets, low capacity, and inadequate institutional set-ups, and proposes increased financial and technical support and standardized guidelines for measurement and reporting as best options. Cases from South Caucasus and Georgia are rare. We therefore examine how Georgia’s current system for Measurement and Reporting is organized, and what the main technical-administrative challenges are for the sector to meet the transparency requirements as seen from key stakeholders’ and implementers’ perspectives. In addition to challenges similar to those identified in the literature, we find that the most fundamental challenge is a lack of domestic political motivation and support. The perceived complexity of the transparency requirements is a major deterrent in combination with the limited capacity to deal with it. We therefore focus our discussion on options for how to foster domestic political support, and argue that emphasizing existing and new co-benefits, including increasingly linking Measurement and Reporting to the carbon market, could be a way forward. Given the urgency of reducing emissions, we find that efforts towards reducing the complexity of the requirements, activities and tools for Measurement and Reporting (M&R) could help adapt the Enhanced Transparency Framework to the actual situation of non-Annex 1 countries and make Measurement and Reporting more worthwhile for these countries.
Assessment of the Local Perceptions on the Drivers of Deforestation and Forest Degradation, Agents of Drivers, and Appropriate Activities in Cambodia
Authors: Ken Sereyrotha , Sasaki Nophea , Entani Tomoe , Ma Hwan Ok , Thuch Phalla , Tsusaka Takuji W.
Published: November 2020

Understanding the drivers of deforestation and forest degradation and the agents of such drivers is important for introducing appropriate policy interventions. Here, we identified drivers and agents of drivers through the analysis of local perceptions using questionnaire surveys, focus group discussions, and field observations. The Likert scale technique was employed for designing the questionnaire with scores ranging from 1 (strongly disagree) to 5 (strongly agree). We found nine direct drivers of forest deforestation and forest degradation, namely illegal logging (4.53 ± 0.60, ± is for standard deviation), commercial wood production (4.20 ± 0.71), land clearing for commercial agriculture (4.19 ± 1.15), charcoal production (3.60 ± 1.12), land clearing for subsistence agriculture (3.54 ± 0.75), new settlement and land migration (3.43 ± 0.81), natural disasters (3.31 ± 0.96), human-induced forest fires (3.25 ± 0.96), and fuelwood for domestic consumption (3.21 ± 0.77). We also found four main indirect drivers, namely lack of law enforcement, demand for timber, land tenure right, and population growth. Our analysis indicates that wood furniture makers, medium and large-scale agricultural investors, charcoal makers, land migrants, firewood collectors, and subsistent farmers were the agents of these drivers. Through focus group discussions, 12 activities were agreed upon and could be introduced to reduce these drivers. In addition to enforcing the laws, creating income-generating opportunities for locals along with the provision of environmental education could ensure long-term reduction of these drivers. The REDD+ project could be an option for creating local income opportunities, while reducing deforestation and forest degradation.
Assessing the Effectiveness of Building Information Modeling in Developing Green Buildings from a Lifecycle Perspective
Authors: Wen Quan , Li Zhongfu , Peng Yifeng , Guo Baorong
Published: November 2020

Building information modeling (BIM) is an emerging technique in the construction industry. It is regarded as an effective approach for green building development; however, its effectiveness has not been sufficiently investigated from a lifecycle perspective. To bridge this research gap, this study investigates BIM application value in different phases of a green building through a convolutional neural network (CNN) method. To begin with, an assessment framework was developed with the consideration of balancing the estimation accuracy and the data size. Then, the validity of the developed model was verified from both theoretical and practical perspectives. Finally, the effectiveness of BIM was tested using the proposed framework. Results showed that the overall score of the tested project was four in the five-point Likert scale, with an average relative error less than 1%. From a value-based perspective, it is revealed that the application value of BIM represented a descending order throughout the lifecycle of the tested project. In addition, it is found that the functional value obtained the highest score, whereas social value was at the bottom. The findings of this study can help decision makers to detect the weaknesses of BIM implementation during green building development.
Influencing Factors of a Sustainable Vegetable Choice. The Romanian Consumers’ Case
Authors: Ladaru Georgiana-Raluca , Ilie Diana Maria , Diaconeasa Maria Claudia , Petre Ionut Laurentiu , Marin Florian , Lazar Valentin
Published: November 2020

The behavior of vegetable consumption in the context of sustainable development has become a point of interest. Determining the barriers and the drivers for developing a sustainable consumption pattern, including food, should be a priority for every nation, as so to be able to design targeted food policies that would contribute to this development. Reducing the pressure on resources by diminishing meat consumption and increasing vegetable consumption is one of the global directions that should be followed. The situation of the current status of vegetable consumption in Romania is, therefore, important. Through an empirical quantitative analysis, the vegetable consumption pattern of Romanian consumers is presented. The results show that the respondents lack proper environmental education and concern, but unconsciously are aware of sustainability criteria such as choosing local and seasonal vegetables, choosing according to the freshness of the vegetables, and wasting little of these purchases. The main barriers determined in developing more sustainable vegetable choices in the case of Romanian consumers are income and time availability restrictions. It is also important to have the ability to identify the local, seasonal, and organic vegetables through specific labels, and to provide the local producers with the ability to sell their products in supermarkets, at fair prices. These would be the main drivers for developing a sustainable vegetable choice. Adding to that, an awareness campaign at the national level regarding the importance of individual choice would contribute to educating towards a sustainable purchasing pattern.
Changes in the Fluctuating Asymmetry of the Leaf and Reproductive Capacity of Betula pendula Roth Reflect Pessimization of Anthropogenically Transformed Environment
Authors: Turmukhametova Nina , Shadrina Elena
Published: November 2020

We have estimated the reproductive capacity of Betulapendula Roth and its relationship with an integrated measure of developmental stability, i.e., fluctuating asymmetry (FA) of the leaf. On the territory of a city with moderate anthropogenic pollution, a change has been detected in the integrated fluctuating asymmetry (IFA) of the morphology of the female reproductive sphere and reproductive capacity of Betula pendula. In conditions of anthropogenic stress, the birch is observed to produce a large yield of fruits annually, which is not subject to year-to-year fluctuations. Morphological variety of size and shape of fruit-producing organs increases along the gradient of industrial and transport pollution; part of morphotypes of infructescences and seeds is characterized by lowered or zero capacity for reproduction determined by seed quality (germination energy and germination capacity). The statistical data processing involved correlation, Shapiro–Wilk test, Levene’s test, factorial ANOVA, Scheffe test, Kruskal–Wallis ANOVA, Mann–Whitney test, χ2 method. Analysis of IFA has allowed us to reasonably well assess the state of the plant organism and to characterize environmental quality. A negative correlation between IFA and quantitative parameters of the functions of the reproductive sphere of B. pendula (infructescence diameter, seed quality) has been found, and positive correlation with qualitative parameters (the number of morphs of infructescences and seeds, the share of rare morphs of infructescences). Pessimization of urban environment creates the conditions for an increase in the share of defective infructescences and non-germinating seeds; a compensatory mechanism for this is an increase in reproductive effort of B. pendula. The consistency of responses in the vegetative and reproductive spheres reflects the disturbances in developmental stability of plants in urban communities.
On the Continuous Cancellative Semigroups on a Real Interval and on a Circle and Some Symmetry Issues
Authors: Bajger Mariusz , Brzdęk Janusz , El-hady El-sayed , Jabłońska Eliza
Published: November 2020

Let S denote the unit circle on the complex plane and ★:S2→S be a continuous binary, associative and cancellative operation. From some already known results, it can be deduced that the semigroup (S,★) is isomorphic to the group (S,·); thus, it is a group, where · is the usual multiplication of complex numbers. However, an elementary construction of such isomorphism has not been published so far. We present an elementary construction of all such continuous isomorphisms F from (S,·) into (S,★) and obtain, in this way, the following description of operation ★: x★y=F(F−1(x)·F−1(y)) for x,y∈S. We also provide some applications of that result and underline some symmetry issues, which arise between the consequences of it and of the analogous outcome for the real interval and which concern functional equations. In particular, we show how to use the result in the descriptions of the continuous flows and minimal homeomorphisms on S.
In Silico Structural and Functional Characterization of HtrA Proteins of Leptospira spp.: Possible Implications in Pathogenesis
Authors: Daroz Brenda Bevilaqua , Fernandes Luis Guilherme Virgílio , Teixeira Aline Florencio , Nascimento Ana Lucia Tabet Oller
Published: November 2020

Leptospirosis is a zoonosis caused by the pathogenic bacteria of the genus Leptospira. The identification of conserved outer membrane proteins among pathogenic strains is a major research target in elucidating mechanisms of pathogenicity. Surface-exposed proteins are most probably the ones involved in the interaction of leptospires with the environment. Some spirochetes use outer membrane proteases as a way to penetrate host tissues. HtrA is a family of proteins found in various cell types, from prokaryotes to primates. They are a set of proteases usually composed of a serine protease and PDZ domains, and they are generally transported to the periplasm. Here, we identified four genes—annotated as HtrA, LIC11111, LIC20143, LIC20144 and LIC11037—and another one annotated as a serine protease, LIC11112. It is believed that the last forms a functional heterodimer with LIC11111, since they are organized in one operon. Our analyses showed that these proteins are highly conserved among pathogenic strains. LIC11112, LIC20143, and LIC11037 have the serine protease domain with the conserved catalytic triad His-Asp-Ser. This is the first bioinformatics analysis of HtrA proteins from Leptospira that suggests their proteolytic activity potential. Experimental studies are warranted to elucidate this possibility.
Optimizing Active Tuberculosis Case Finding: Evaluating the Impact of Community Referral for Chest X-ray Screening and Xpert Testing on Case Notifications in Two Cities in Viet Nam
Authors: Mac Tuan Huy , Phan Thuc Huy , Nguyen Van Van , Dong Thuy Thu Thi , Le Hoi Van , Nguyen Quan Duc , Nguyen Tho Duc , Codlin Andrew James , Mai Thuy Doan To , Forse Rachel Jeanette , Nguyen Lan Phuong , Luu Tuan Ho Thanh , Nguyen Hoa Binh , Nguyen Nhung Viet , Pham Xanh Thu , Tran Phap Ngoc , Khan Amera , Vo Luan Nguyen Quang , Creswell Jacob
Published: November 2020

To accelerate the reduction in tuberculosis (TB) incidence, it is necessary to optimize the use of innovative tools and approaches available within a local context. This study evaluated the use of an existing network of community health workers (CHW) for active case finding, in combination with mobile chest X-ray (CXR) screening events and the expansion of Xpert MTB/RIF testing eligibility, in order to reach people with TB who had been missed by the current system. A controlled intervention study was conducted from January 2018 to March 2019 in five intervention and four control districts of two low to medium TB burden cities in Viet Nam. CHWs screened and referred eligible persons for CXR to TB care facilities or mobile screening events in the community. The initial diagnostic test was Xpert MTB/RIF for persons with parenchymal abnormalities suggestive of TB on CXR or otherwise on smear microscopy. We analyzed the TB care cascade by calculating the yield and number needed to screen (NNS), estimated the impact on TB notifications and conducted a pre-/postintervention comparison of TB notification rates using controlled, interrupted time series (ITS) analyses. We screened 30,336 individuals in both cities to detect and treat 243 individuals with TB, 88.9% of whom completed treatment successfully. All forms of TB notifications rose by +18.3% (95% CI: +15.8%, +20.8%). The ITS detected a significant postintervention step-increase in the intervention area for all-form TB notification rates (IRR(β6) = 1.221 (95% CI: 1.011, 1.475); p = 0.038). The combined use of CHWs for active case findings and mobile CXR screening expanded the access to and uptake of Xpert MTB/RIF testing and resulted in a significant increase in TB notifications. This model could serve as a blueprint for expansion throughout Vietnam. Moreover, the results demonstrate the need to optimize the use of the best available tools and approaches in order to end TB.
Defusing COVID-19: Lessons Learned from a Century of Pandemics
Authors: Mujica Graciela , Sternberg Zane , Solis Jamie , Wand Taylor , Carrasco Peter , Henao-Martínez Andrés F. , Franco-Paredes Carlos
Published: November 2020

Amidst the COVID-19 global pandemic of 2020, identifying and applying lessons learned from previous influenza and coronavirus pandemics may offer important insight into its interruption. Herein, we conducted a review of the literature of the influenza pandemics of the 20th century; and of the coronavirus and influenza pandemics of the 21st century. Influenza and coronavirus pandemics are zoonoses that spread rapidly in consistent seasonal patterns during an initial wave of infection and subsequent waves of spread. For all of their differences in the state of available medical technologies, global population changes, and social and geopolitical factors surrounding each pandemic, there are remarkable similarities among them. While vaccination of high-risk groups is advocated as an instrumental mode of interrupting pandemics, non-pharmacological interventions including avoidance of mass gatherings, school closings, case isolation, contact tracing, and the implementation of infection prevention strategies in healthcare settings represent the cornerstone to halting transmission. In conjunction with lessons learned from previous pandemics, the public health response to the COVID-19 pandemic constitutes the basis for delineating best practices to confront future pandemics.
The Effect of Non-Conservative Compressive Force on the Vibration of Rotating Composite Blades
Authors: Amoozgar Mohammadreza , Bodaghi Mahdi , Ajaj Rafic M.
Published: November 2020

This paper investigates the effectiveness of a resonance avoidance concept for composite rotor blades featuring extension–twist elastic coupling. The concept uses a tendon, attached to the tip of the blade, to apply a proper amount of compressive force to tune the vibration behavior of the blade actively. The tendon is simulated by applying a non-conservative axial compressive force applied to the blade tip. The main load carrying part of the structure is the composite spar box, which has an antisymmetric layup configuration. The nonlinear dynamic behavior of the composite blade is modelled by using the geometrically exact fully intrinsic beam equations. The resulting nonlinear differential equations are discretized using a time–space scheme, and the stationary and rotating frequencies of the blade are obtained. It is observed that the proposed resonance avoidance mechanism is effective for tuning the vibration behavior of composite blades. The applied compressive force can shift the frequencies and the location at which the frequency veering take place. Furthermore, the compressive force can also cause the composite blade to get unstable depending on the layup ply angle. Finally, the results, highlighting the importance of compressive force and ply angle on the dynamic behavior of composite blades, are presented and discussed.
AVALIAÇÃO DAS PROPRIEDADES MECÂNICAS DE FIOS E BRAQUETES ORTODÔNTICOS ESTÉTICOS
Authors: Fagundes Igor Geoffroy Barbosa , Beani Guilherme Garcia , Mota Monalisa Costa , Marchette Sandro , Maltagliati Liliana Ávila , Matias Murilo
Published: November 2020

Objetivo: comparar as forças de deflexão nos fios ortodônticos estéticos em braquetes autoligáveis cerâmicos passivos e interativos. Métodos: Quatro corpos de prova foram montados em um modelo de simulação clínica e avaliados em uma Máquina de Ensaio Universal (Emic). Em uma placa de resina acrílica foram fixados 10 dispositivos, onde foram colados os braquetes, simulando o arco dentário superior em forma de parábola. O dispositivo de acrílico representante do incisivo central direito foi movimentado em ativações de 0 a 3 mm, com velocidade constante de 0,5 mm/min. Testes de Análise de Variância e de Tukey, com significância de 5% (P
A A new matrix of MALDI-TOF MS derivative of 9-aminoacridine for lipid identification in positive ions mode
Authors: Martins Jefferson , Zappa Fabio , Da Silva Adilson David , Pinho Roberto , Silva Thiago , Amaral Kátia , Gentile Rosana , Melo Rossana C. N. , Quirino Welber , Stroppa Pedro Henrique
Published: November 2020

Matrix-assisted laser desorption/ionization (MALDI) has evolved to become a well- established technique during the last decades. Because of matrix peak interference in the low molecular-weight region, however, new matrices are often studied with the purpose of improving the spectral quality under m/z 500. Herein, we present the substance 2,4,5,7-tetranitro-9-aminoacridine (TNA) as a suitable alternative matrix for lipid detection in the positive-ion mode. TNA is obtained from 9-aminoacridine, a matrix commonly used to analyze lipids in negative-ion mode, with the addition of 4 nitro groups through a synthetic path. The procedure results in a highly conjugated system that presents a bigger electronic dispersion and therefore higher UV absorption. First, we demonstrated the high sensitivity of TNA for retinol. Second, TNA was applied to detect lipids in the liver of the water rat Nectomys squamipes. By using this natural model of hepatic steatosis (fat liver), a condition in which there is excessive accumulation of lipids, TNA provided a clearer identification of three species of polyunsaturated fatty acids (PUFAs) compared to other matrices. TNA presents better sensitivity and spectral resolution, little or no interference from matrix ions, high intensity of signal and low cost with high yield of matrix production.
On apparent barrier-free reactions
Authors: Ballester Maikel
Published: November 2020

Rate coefficients of bi-molecular chemical reactions are fundamental for kinetic models. The rate coefficient dependence on temperature is commonly extracted from the analyses of the reaction minimum energy path. However, a full dimension study of the same reaction may suggest a different asymptotic low-temperature limit in the rate constant than the obtained from the energetic profile.
Quantitative behavior study of velocity, radius and topological charge on skyrmion/edge interaction dynamics on Co/Pt nanotrack
Authors: Andrade Santece Isaac , Carlos Souza Gomes Josiel , Toscano Danilo , Gama Monteiro Jr. Maxwel , Almeida de Mendonça João Paulo , Irineu Levartoski de Araujo Clodoaldo , Sato Fernando , De Andrade Leonel Sidiney , Zimmermann Coura Pablo
Published: November 2020

Skyrmions are considered promising candidates to be the information carriers in the next generation of data storage and logic devices, due to its stability and easy control under the application of an electric current. For future technological applications in spintronic devices, it is important to study the properties behavior of these topological excitations during its movement on magnetic nanotracks, specially because in ferromagnetic materials they suffer a kind of magnus effect which tends to spell the skyrmion through the borders, preventing its transport throughout the nanotrack. We used micromagnetic simulations to study the dynamics of a skyrmion on a magnetic nanotrack induced by a spin polarized electric current. We considered thin magnetic nanotrack made of cobalt and platinum multilayers, whose magnetic state is perpendicular to the track plane and contain a single Néel-type Skyrmion. To describe this magnetic system, we used a Hamiltonian containing exchange, Dzyaloshinskii-Moriya, perpendicular magnetic anisotropy and dipole-dipole interactions. In our study we observed the well-known Skyrmion Hall effect and changes in the structure of the skyrmion when it approaches of the border. This alteration can be measured by determining the radius and the topological charge of the Skyrmion. Our simulation results show that both the radius and the topological charge decrease when it approaches of the border. Our study also demonstrates that the skyrmion-border interaction is repulsive, but there is a minimum distance from the border at which the interaction becomes attractive. If the skyrmion exceeds this critical position yc, it will be attracted and annihilated at the border of the nanotrack. We also performed simulations to obtain the limit value jc of the applied current density that the skyrmion can be transported along of the nanotrack without escaping from the side edge. From a technological point of view for possible applications in spintronic devices, the estimate of  jc  is of crucial importance.
PENGARUH LINGKUNGAN KERJA DAN KOMPENSASI TERHADAP KINERJA PEGAWAI PADA DINAS PENDIDIKAN, PEMUDA DAN OLAHRAGA KABUPATEN MAJENE
Authors: Hartawati Sri Indira , Sahur Meutia A
Published: November 2020

This research was conducted at the Department of Education, Youth and Sports of Majene Regency with the title The Effect of Work Environment and Compensation on Employee Performance. The formulation of the problem used by researchers is How the influence of the Work Environment on Employee Performance at the Education and Youth Sports Office of Majene Regency, How the influence of Compensation on Employee Performance at the Education and Youth Sports Office of Majene Regency, which variables have more influence on Employee Performance at the Education and Youth Office Majene District Sports. The research method, namely the population and sample used in this study were all employees of the Department of Education and Youth Sports of Majene Regency, which amounted to about 50 people, while the analysis method used the Validity Test, Reliability Test, Multiple Linear Regression Analysis This analysis was used to determine how much influence it had. independent variables, namely: compensation (X1), and work environment (X2) on the dependent variable, namely Employee Performance (Y). Multiple linear regression equations, Partial Significance Test (t test) and Simultaneous Test (F test). The results obtained from this study are the work environment has a significant effect on employee performance at the Department of Education and Youth Sports of Majene Regency, compensation has an effect on employee performance at the Education and Youth Sports Office of Majene Regency. and the work environment has a more dominant influence on employee performance at the Department of Education and Youth Sport, Majene Regency.

Keywords: Work Environment, Compensation, Employee Performance
Violation of the
T
−1
Relationship in the Lattice Thermal Conductivity of Mg
3
Sb
2
with Locally Asymmetric Vibrations
Authors: Zhu Yifan , Xia Yi , Wang Yancheng , Sheng Ye , Yang Jiong , Fu Chenguang , Li Airan , Zhu Tiejun , Luo Jun , Wolverton Christopher , Snyder G. Jeffrey , Liu Jianjun , Zhang Wenqing
Published: November 2020

Most crystalline materials follow the guidelines of

T

−
1

temperature-dependent lattice thermal conductivity (

κ

L

) at elevated temperatures. Here, we observe a weak temperature dependence of

κ

L

in Mg
3
Sb
2
,

T

−
0.48

from theory and

T

−
0.57

from measurements, based on a comprehensive study combining
ab initio
molecular dynamics calculations and experimental measurements on single crystal Mg
3
Sb
2
. These results can be understood in terms of the so-called “phonon renormalization” effects due to the strong temperature dependence of the interatomic force constants (IFCs). The increasing temperature leads to the frequency upshifting for those low-frequency phonons dominating heat transport, and more importantly, the phonon-phonon interactions are weakened. In-depth analysis reveals that the phenomenon is closely related to the temperature-induced asymmetric movements of Mg atoms within MgSb
4
tetrahedron. With increasing temperature, these Mg atoms tend to locate at the areas with relatively low force in the force profile, leading to reduced effective 3
rd
-order IFCs. The locally asymmetrical atomic movements at elevated temperatures can be further treated as an indicator of temperature-induced variations of IFCs and thus relatively strong phonon renormalization. The present work sheds light on the fundamental origins of anomalous temperature dependence of

κ

L

in thermoelectrics.
Sing and learn
Authors: Nunes Mariana Backes , Lazzari Melissa Giovana , Barcellos Patrícia da Silva Campelo Costa , Moraes Michele Moraes de
Published: November 2020

As tecnologias digitais da informação e comunicação estão presentes em nosso cotidiano a todo instante, influenciando também os processos de ensino-aprendizagem de língua estrangeira ao fornecer material autêntico e audiência real aos aprendizes. A ferramenta virtual Sing and Learn é um website de estudo de língua inglesa a partir de letras de músicas, ferramenta que não apenas proporciona exercícios de compreensão oral, como também oferece práticas de vocabulário, gramática, leitura e escrita, de maneira a instigar os alunos a se valer de diferentes estratégias de aprendizagem (MORAES, 2017). O presente trabalho busca, então, analisar uma lição realizada no Sing and Learn a partir do conceito de estratégias de aprendizagem (OXFORD, 1990; 2003), bem como será investigada a recepção de estudantes universitários diante da ferramenta citada. Para tanto, os dados da pesquisa foram obtidos através de um questionário virtual aplicado com alunos de uma disciplina de Inglês Instrumental após realizarem a lição. Como método de análise dos dados, foi construída, a partir de Saldaña (2012), uma classificação através de códigos para as respostas dadas pelos alunos às perguntas dissertativas propostas no questionário. Os resultados do estudo mostram uma aceitação da ferramenta por parte dos aprendizes, verificando que ela tem muito a contribuir para o ensino-aprendizagem de língua inglesa.
Educação linguística crítica e a produção digital de infográficos por alunos do ensino médio técnico com temáticas contra homofobia
Authors: Gomes Rosivaldo , Nogueira Heloane Baia
Published: November 2020

Este artigo apresenta resultados de um estudo que visou investigar práticas de produção textual digital do gênero discursivo hipermidiático infográfico, envolvendo multiletramentos e educação linguística crítica e cidadã com alunos do Ensino Médio Técnico de um instituto técnico federal, na região norte do Brasil. Para fundamentação teórica, consideramos as discussões sobre educação linguística em uma perspectiva crítica, teorizações sobre a pedagogia dos (multi)letramentos e a aprendizagem por design. A pesquisa, de caráter qualitativo-interpretativo, configurou-se uma pesquisa-ação. O corpus analisado é composto por recortes da produção textual de um exemplar de um infográfico interativo que foi elaborado por alunos de um curso de mineração. Os resultados da análise demonstram que os aprendizes, além de se apropriarem de práticas de multiletramentos digitais para produção técnica dos textos, também despenharam papel de analistas críticos diante da temática trabalhada no que diz respeito ao combate à homofobia.
Experimentos com o Cordel no jogo teatral
Authors: Couto Lara Barbosa , Magalhães Elton Linton Oliveira
Published: November 2020

Pretende-se analisar estratégias e abordagens de cruzamento entre o jogo teatral na sala de aula e a literatura de cordel, visando o aprimoramento dos estudantes em cena e uma aproximação com o cordel e suas características. Os procedimentos têm em vista uma experiência multidisciplinar na qual alunos participantes possam vivenciar aspectos fundamentais dos jogos teatrais e da literatura de cordel tradicional. A experimentação conjunta parte de aspectos fundamentais da escrita de cordel: a métrica e a rima, que se transformam em regras de jogo nas proposições metodológicas. Da mesma maneira, os aspectos fundamentais para os jogos spolinianos – o “quem”, o “onde” e o “o quê” – podem servir de princípio para a produção de folhetos, incentivando a produção de dramaturgias em cordel.
Circulação, recepção e apropriação do método de ensino do desenho de Louise Artus-Perrelet
Authors: Almeida Marilene Oliveira , Veneroso Maria do Carmo de Freitas , Campos Regina Helena de Freitas
Published: November 2020

O método de ensino do desenho para crianças da arte-educadora Louise Artus-Perrelet foi sistematizado no livro Le Dessin au Service de l’Éducation, traduzido e publicado no Brasil em 1930, quando a autora visitou o país para conferências. O trabalho de Artus-Perrelet é analisado como proposta de educação estética na formação de professores primários, relacionando-o aos princípios modernistas na arte e ao movimento da Escola Nova. Artus-Perrelet dialoga com processos pedagógicos e de criação de Paul Klee e Wassily Kandinsky, professores na Escola Bauhaus, e com a pedagogia ativa genebrina. Seu método foi apropriado no contexto brasileiro por meio de relatos da poeta Cecília Meireles publicados no Rio de Janeiro, e no trabalho de seu aluno Jean-Pierre Chabloz, artista plástico e educador.
Emission properties of intrinsic and extrinsic defects in Cu2SnS3 thin films and solar cells
Authors: Kanai Ayaka , Sugiyama Mutsumi
Published: November 2020

Intrinsic and extrinsic defects around the p–n interface in Cu2SnS3 (CTS) solar cells were evaluated using low-temperature photoluminescence (LT-PL) measurements. The intrinsic defects were investigated based on the PL-dependence of CTS films on the excitation power and temperature. Donor–acceptor pair recombination was observed with shallow acceptors (copper vacancies, V
Cu) located approximately 18 meV above the valence band maximum and typical donors located 72 and 112 meV below the conduction band minimum (CBM). The PL spectra of various CTS solar cell structures were measured to identify the Cd-related defects formed by Cd diffusion from the CdS layer. A new LT-PL peak was observed at 0.87 eV for the CdS/CTS solar cells, corresponding to D–A pair recombination with Cd on Cu site donors located 62 meV below the CBM. A p–n homojunction may form in CTS by V
Cu passivation by Cd diffusion and suppressed interface recombination.
Kritik Implentasi Corporate Social Responsibility Pada Perusahaan Minyak Dan Gas Perspektif Maqasid Al-Syari’ah
Authors: Purnomo Joko Hadi
Published: November 2020

Corporate Social Responsibility is an interesting topic, since various theories are used as a basis for implementing it. Oil and Gas Company is one of the entities that practice Corporate Social Responsibility. The Corporate Social Responsibility implementation in oil and gas companies is oriented to their own interests in achieving the optimal profits. Oil and gas as one of the natural resources included in community ownership cannot be owned absolutely by anyone, including individuals, groups and even countries. The method used was a critical review of the Corporate Social Responsibility implementation in oil and gas companies. The results showed that the Corporate Social Responsibility implementation of oil and gas companies referred to the theory of shareholders oriented to the interests of shareholders. Corporate Social Responsibility implementation was only used to build a company’s reputation, so that the company would get increasing profits. The Corporate Social Responsibility implementation of oil and gas companies which referred to the theory of stakeholders was only oriented towards building public confidence that the company was sincere in carrying out Corporate Social Responsibility projects, but basically its expectations were on the company’s reputation. In addition, the involvement of stakeholders was not given room to make decisions about Corporate Social Responsibility implementation. Corporate Social Responsibility in the perspective of maqasid al-syari’ah must fulfill 4 (four) main components, consisting of maqasid al-syari’ah compliance, formation of a multi-stakeholder body, establishment of a Sharia Board, and fulfillment of sharia compliance.
Keywords: Corporate Social Responsibility, Oil and Gas Companies, Maqasid Al-Syari’ah
Természetes nyelvű interfész architektúra e-tutor környezetben
Authors: Kovács László , Megyeri Balázs
Published: November 2020

Az ember-számítógép terület mindig is fontos részét képezte az informatikának. Már az első modern komputereknél is szempont volt, hogy a gép az ember számára könnyen kezelhető legyen. Igény született az ember-gép kapcsolat egyszerűsítésére és emberibbé tételére. Ezt az igényt kezdetben a grafikus interfészek elégítették ki, azonban a 21. századra az emberek lényegében összenőttek a technológiával, így szükségessé vált ezen kapcsolat természetes nyelvi elemekkel való kibővítése, így megalkotva az ember-gép kommunikáció eddigi legeffektívebb módszerét.