bluuebunny/crossref_metadata_2025 huggingface dataset:
Sharing Drawings with Smartphones in the Classroom – Art-Based Education in Social Sciences
Authors: De Arriba Raúl , Vidagañ María
Published: August 2020

This article identifies the factors that indicate the opportunity of reviewing the methods in teaching economics in order to overcome the traditional teaching-learning scheme that overvalues rote learning and find formulas that facilitate the development of analytical skills. On the other hand, this work points out the importance of developing creative competences. One way to do this is to introduce artistic practices in the classroom, even in non-artistic subjects. In this work an experience of education based on the arts is presented. Thanks to smartphone cameras, students can share and project drawings in the classroom immediately to facilitate group learning. The proposal is to represent the economic problems of the third world through drawings made by students of Sociology at the University of Va-lencia (Spain). The experience shows positive results in terms of students' engagement and creativity development.
Motivation of University Students Towards the Use of Information and Communication Technologies and Their Relation to Learning Styles
Authors: Navarro Oscar , Sanchez-Verdejo Francisco Javier , Anguita Juana Maria , Gonzalez Angel Luis
Published: August 2020

Motivation can influence the success of the teaching-learning process. The use of Information and Communication Technology (ICT) in Education is becoming more and more frequent. In fact, its presence is very engaging and may improve learning. This study is aimed at analysing the relation between university students' intrinsic motivation and their learning styles, where variables such as gender and the universities at which they study can be essential. For that purpose, the answers provided in both the IMI (Intrinsic Motivation Inventory) questionnaire and the Felder and Silverman's Learning Style Inventory by a sample of 272 students from two different universities have been taken into account. The two questionnaires were completed online, allowing access from any device with an internet connection. Once the data obtained was analysed, a high correlation among the six dimensions of the motivation questionnaire was observed. Said correlation does not apply to Felder and Silverman's test, where there is little correspondence among the eight styles in the inventory. A clear relation between two learning styles (Visual and Reflective) and intrinsic motivation is also noted. It should be highlighted that on examination of the variables corresponding to the university where student study and the latter’s gender were examined, certain differences appeared, such as the prevalence of some learning styles in male participants.
A Portable Cattle Tagging Based on Muzzle Pattern
Authors: Indrabayu Indrabayu , Nurtanio Ingrid , Areni Intan Sari , Bugiwati Sri R.A , Bustamin Anugrayani , Rahmatullah Muhammad
Published: August 2020

This research focuses on developing an Android-based cattle identification system that is applicable and easy to use. This system uses a Scale Invariant Feature Transform (SIFT) algorithm to extract features from the muzzle images, and Random Sample Consensus (RANSAC) algorithm to eliminate features incompatibility. The system is experimented with four threshold values, i.e. 10, 15, 20, and 30 using a total data of 460 muzzle images.  In the first experiment, 3 images from each individual are used in the training stage and 2 images are used as the data test. In the second experiment, 5 images from each cattle are used in the training stage and 5 images are used as the data test. Data used in training stage are 244 images and in testing stage is 816 images. From the experiment, the highest accuracy rate is 98.1% with threshold values of 15 and 20. The execution time is also calculated to measure the processing time of the system. The average time taken to store an image to the database is 1.3 seconds. The main contribution of this research is technology implementation and more portable muzzle identification for local cattle in Makassar.
Development of Electronic Educational Resources for Physics with Elements of Augmented Reality Technology
Authors: Daineko Yevgeniya , Ipalakova Madina , Tsoy Dana , Seitnur Aigerim , Baurzhan Zhandos , Elgondy Ersultanbek
Published: August 2020

The paper presents the work on the educational mobile application based on Unity game engine using Vuforia platform. The appropriate research on electronic educational resources and augmented reality technology was conducted. The authors also studied the world experience in the use of the technology in various fields of its application, in education as a whole and in physics in particular. As an outcome of the work, an electronic educational resource for secondary educational institutions was developed. It was implemented as an application for conducting virtually a set of the laboratory works in physics using augmented reality.
A Practical Analysis of Mobile Data Collection Apps
Authors: Loola Bokonda Patrick , Ouazzani-Touhami Khadija , Souissi Nissrine
Published: August 2020

Nowadays, data collection has become an activity inherent in the emergence of any organization. The digital age has enabled the development of mobile data collection apps that are becoming increasingly common around the world. But faced with the growing number of apps offered, Data Managers are often challenged by with the choice of the solution that best suits their case.

This study meets this need by providing clear, precise and verified information on each of the selected solutions. The study presents, analyzes and compares four mobile data collection solutions. To achieve an effective comparison, we first chose to collect and select papers on each of the solutions, and then to install and test each of them by executing a data collection process, all the way from the form creation to the visualization of collected data. The comparison presented in this paper was based on technical aspects but also on other important aspects to help users make a good decision.
WhatsApp Group for Teaching and Learning in Indonesian Higher Education: What’s Up?
Authors: Rahmadi Imam Fitri
Published: August 2020

Technology plays a pivotal role in today’s teaching and learning process in terms of facilitating learning and improving students’ performance. Exploring an avant-garde technology to be integrated into the classroom is critical for finding new ways of learning. This study aimed at investigating university students’ usage, perception, attitude, and readiness towards the WhatsApp group as a teaching and learning platform. This is an exploratory study engaged in one class of university students after joining a course conducting by integrating a WhatsApp group for teaching and learning platform. The result revealed that students actively use WhatsApp in daily life, but unfortunately passively use it for learning in a group. Students recognise that the WhatsApp group is of potential for ubiquitous learning, and they have a good attitude to this app as a teaching and learning platform. However, it found that students are not ready yet to learn actively, collaboratively, and independently through the WhatsApp group. The academic and practical implications of these findings are discussed, and avenues for future research outlined.
Management of Wireless Communication Systems Using Artificial Intelligence-Based Software Defined Radio
Authors: Bargarai Faiq A. Mohammed , Abdulazeez Adnan Mohsin , Tiryaki Volkan Müjdat , Zeebaree Diyar Qader
Published: August 2020

The wireless communication system was investigated by novel methods, which produce an optimized data link, especially the software-based methods. Software-Defined Radio (SDR) is a common method for developing and implementing wireless communication protocols. In this paper, SDR and artificial intelligence (AI) are used to design a self-management communication system with variable node locations. Three affected parameters for the wireless signal are considered: channel frequency, bandwidth, and modulation type. On one hand, SDR collects and analyzes the signal components while on the other hand, AI processes the situation in real-time sequence after detecting unwanted data during the monitoring stage. The decision was integrated into the system by AI with respect to the instantaneous data read then passed to the communication nodes to take its correct location. The connectivity ratio and coverage area are optimized nearly double by the proposed method, which means the variable node location, according to the peak time, increases the attached subscriber by a while ratio
The Effects of Usability and Accessibility for E-Government Services on the End-user Satisfaction
Authors: Alshira'H Mohammad H
Published: August 2020

The research aimed to discover the effects of website usability and accessibility on the satisfaction of the end-user. To achieve the aims of the research, the questionnaire was used. The outcomes of the research found that all the participants had a positive agreeing that website usability for e-government services. Also, the participants were agreeing that website accessibility for e-government services designs in Jordan have good agreement, responses were positive towards that. Besides, there is a positive effect of website usability on the satisfaction of the end-user on e-government website designs in Jordan. In addition, the result showed that there is a positive impact of website accessibility on the satisfaction of the end-user on e-government website designs in Jordan. The research recommended that the user interfaces and website accessibility in the Jordanian e-government website designs must further be developed to attract more users and maintaining user satisfaction. And, Jordan e-government systems must be maintaining a high degree of integration and flexibility to attract more users.
DIAGNOSIS OF LUNG CANCER USING MULTISCALE CONVOLUTIONAL NEURAL NETWORK
Authors: Yektaei Homayoon , Manthouri Mohammad
Published: August 2020

Lung cancer is one of the dangerous diseases that cause huge cancer death worldwide. Early detection of lung cancer is the only possible way to improve a patient’s chance for survival. This study presents an innovative automated diagnosis classification method for Computed Tomography (CT) images of lungs. In this paper, the CT scan of lung images was analyzed with the multiscale convolution. The entire lung is segmented from the CT images and the parameters are calculated from the segmented image. The use of image processing techniques and identifying patterns in the detection of lung cancer from CT images reduces human errors in detecting tumors, and speeds up diagnosis time. Artificial Neural Network (ANN) has been widely used to detect lung cancer, and has significantly reduced the percentage of errors. Therefore, in this paper, Convolution Neural Network (CNN), which is the most effective method, is used for the detection of various types of cancers. This study presents a Multiscale Convolutional Neural Network (MCNN) approach for the classification of tumors. Based on the structure of MCNN, which presents CT picture to several deep convolutional neural networks with different size and resolutions, the classical handcrafted features extraction step is avoided. The proposed approach gives better classification rates than the classical state of the art methods allowing a safer Computer-Aided Diagnosis of pleural cancer. This study reaches a diagnosis accuracy of [Formula: see text] using multiscale convolution technique, which reveals the efficiency of the proposed method.
Skin temperature of middle distance runners after a maximum effort test
Authors: Barboza Jean Artur Mendonça , Souza Larissa Isabelle Soares , Cerqueira Mikhail Santos , Andrade Palloma Rodrigues de , Santos Heleodório Honorato dos , Ferreira José Jamacy de Almeida
Published: August 2020

The purpose of this study was to analyze skin temperature (Tsk) responses after a short-term maximum effort test in middle-distance runners. A quasi-experimental study was conducted with ten men (age 23.5±5.10 years) who trained 5 days per week, 2 to 3 hours per day, and were submitted to thermographic evaluation before and after Cooper's 12-minute run test (CRT). The mean temperature of the anterior-superior, posterior-superior, anterior-inferior, and posterior-inferior regions was compared between the sides (i.e., left and right) before and after CRT. The paired t-test showed a significant decrease in Tsk after CRT in the following regions: right pectoralis major (-3.4%), left pectoralis major (-3.4%), and abdomen (-5%) in the anterior-superior view (p<0.01); and in the upper right trunk (-1.9%), upper left trunk (-1.9%) and lower back (-2.9%) in the posterior-superior view (p<0.05). In the lower limbs, a significant increase in temperature of the left knee (1.6%), and right (3.6%) and left ankles (2.9%) in the anterior view (p<0.05), as well as in the right (4.3%) and left ankles (3.7%) in the posterior view (p<0.05) were observed. There was no difference in temperature between the right and left sides. In conclusion, the Tsk change of middle-distance runners was symmetrical between sides, decreasing in upper limbs and trunk and increasing in lower limbs after a short-term maximum effort test.
Implementation of the pact for health in Brazil: what changes did it bring to child mortality?
Authors: Souza Talita Araujo de , Andrade Fábia Barbosa de
Published: August 2020

This study aimed to verify the association of social inequalities with infant mortality rate so as to infer what has changed in Brazil with the implementation of the Pact for Life. This was an epidemiological ecological study of the time series type with spatial correlation carried out through the Mortality Information System, considering the years from 1996 to 2016. For the development and analysis of the data, the 161 Intermediate Regions of Urban Articulation were considered. The infant mortality coefficient in the years studied was the dependent variable, and as independent variables, the ones selected were the Human Development Index, Gini Index, percentage of poor people and the coverage of the Family Grant Program. Descriptive data were analyzed in the Statistical Package for the Social Sciences. Mortality data were spatialized to determine bivariate spatial autocorrelations using the Geoda software. It was identified in the results that there was a decrease in the infant mortality rate in the decades; spatial autocorrelation showed high coefficients in the Northeast in the first decade, and higher coefficients in the North and Midwest in the second decade. In the bivariate analysis of the infant mortality coefficient with the Human Development Index, greater autocorrelation was observed in the Southeast, South and Midwest regions in the two decades; with the Gini index, the first decade showed autocorrelation in the North and Northeast, and in the second decade, there was autocorrelation in the North, Northeast, and Midwest. When assessed with poverty, autocorrelation was observed in the North and Northeast; and with coverage of the Family Grant Program, autocorrelation was concentrated in the Northeast. Even before and after the release of the Pact for Life, social inequalities were directly related to infant mortality. The Pact, which had one of its indicators the reduction in infant mortality, was effective when evaluated in isolation, however, despite the decrease in this problem.
“Pela paz de Jerusalém”
Authors: Wachholz Wilhelm , Reinke André Daniel
Published: August 2020

Este artigo apresenta a história do sionismo cristão e seu desenvolvimento como pensamento escatológico protestante (inicialmente observador dos acontecimentos em torno da questão nacionalista judaica) até seu engajamento político em favor do Estado de Israel no contexto anglo-saxão e brasileiro. Este desenvolvimento será demonstrado em duas partes. A primeira, O sionismo e o sionismo cristão: uma parceria histórica, demonstra como o problema do antissemitismo encontrou solução no nacionalismo judaico (o qual resultou na criação do Estado de Israel) e como tal movimento foi apoiado pela Grã-Bretanha e Estados Unidos da América, em uma política influenciada pela teologia dispensacionalista. A segunda parte, O sionismo cristão no Brasil, demonstra como o protestantismo brasileiro – especialmente o pentecostal – possui um rosto norte-americano, de onde provém a teologia e o posicionamento político em prol de Israel. O resultado dessa influência é percebida nos discursos e ações da Bancada Evangélica no Congresso Nacional.
Igrejas pentecostais e sua atuação política recente no Brasil
Authors: Oliveira David Mesquiati
Published: August 2020

O texto busca romper com as análises que se tornaram hegemônicas sobre os pentecostalismos e sua atuação política no Brasil e na América Latina. Muito apressadamente os críticos têm utilizado categorias de análise que não se mostram adequadas frente aos dados, como o resultado da eleição presidencial de 2018. Clientelismo e conservadorismo são exemplos de aproximações que não dão conta de estudar a atuação pentecostal na política, uma vez que, entre outras razões, não é uma característica única do grupo, e sim comum à larga tradição das relações entre o cristianismo e os governos brasileiros, o que inclui o catolicismo e os protestantes. Depois de panorama da relação entre pentecostais e política nacional no Brasil, o texto avança para uma breve avaliação dessa atuação política partidária.
Influence of Lithium Oxide on the Characteristics and Mechanical Property in Willemite Crystal Glazes
Authors: Dechboon Nophawan , Nuntiya Apinon , Saelee Cherdsak , Thiansem Sakdiphon
Published: August 2020

The effect of lithium Oxide content on the characteristics and mechanical property of willemite (2ZnO.SiO2) under a heating condition in Na2O-K2O-Li2O-CaO-(ZnO)-Al2O3-SiO2 glazing system used in stoneware, sintered at a maximum at temperature 1250 °C by a heating rate of 2.6 °C/min for 8 hours is the firing process of the glazes and clay to melt. After 15 minutes, the temperature dropped to 1100 °C for 40 minutes was stimulated crystallization and soaked in kiln at 1100 °C for 4 hours. This result was consistent with the chemical compositions from the XRF technique indicated that the glaze comprised ZnO and SiO2 were the main compositions and compared to the mineral composition after sintering of the glazed crystal which revealed 2ZnO.SiO2 as the main component and the result from the XRD technique. The microstructure of the glazed crystals after sintering was needle shaped and had spherical growth. The analytical results from Vickers hardness technique showed that microhardness by adding 3-5 % of Li2O of the glazes S1, S2, S3, S4 and S5 as 105.96 ± 4.58, 112.30 ± 9.95, 153.90 ± 7.29, 244.80 ± 5.42 and 382.62 ± 9.20, respectively. More willemite crystals in the glaze results in more strength of the glaze as well.
Lightweight Cellular Glass Composite from Eggshell and Glass Cullet Powder for Insulation and Bioactive Glass Applications
Authors: Tangboriboon Nuchnapa , Ratchatawatanapipat Nathawith , Kongpaopong Kunanya
Published: August 2020

Cellular glass composites can be made of waste flat glass or bottle glass added with eggshell powder 0, 1, 3 and 5%wt and then fired at 800° and 900°C for 1 h using compression molding process. Adding eggshell powder mixed with glass cullet affects to form open and closed pores and to decrease firing temperature, thermal expansion coefficient and light weight. However, adding high amount of eggshell powder affects to form an excessively amount of open and closed pores effect to increase water absorption. The standard Thailand Industries determines water absorption of glass foam less than 25% because high water absorption affects to decrease mechanical properties. Therefore, cellular glass composites added 1, 3 and 5%wt should not be fired at temperature higher than 800°C for 1h. In addition, the cellular glass composites added 1 %wt eggshell powder and fired at 900°C for 1 h still have low water absorption and low thermal expansion coefficient. Cellular glass composites are potential to apply for many industries such as construction, petroleum and petrochemical, insulation, medical and dental applications.
Effect of Friction Stir Forming Process Parameters on Mechanical Interlock between A5083Alloy and Ultra-Thin Stainless Steel Strands
Authors: Tabatabaei Hamed Mofidi , Kobayashi Keita , Ohashi Takahiro , Nishihara Tadashi
Published: August 2020

Fibre-reinforced materials have gathered attention because of their significant properties such as heat resistance, abrasion resistance and specific strength. The present study proposes a new method of joining stainless steel strands with an aluminium alloy using friction stir forming and analyses the formation of a fibre-reinforced aluminium alloy composite material. Mechanical interlocks between the strands and the aluminium alloy are evaluated based on cross-sectional microstructure observations and EDS analysis. The tensile test indicated an increasing tendency of strength by increasing the number of strands and bending tests showed that higher strength is achieved in rare bend because of inhomogeneous grain distribution after friction stir forming (FSF).
Mechanical Properties of Hollow Glass Microspheres Filled Jute Woven Comingled Composites
Authors: Awais Habib , Nawab Yasir , Amjad Adnan , Anjang Aslina , Zainol Abidin Mohd Shukur
Published: August 2020

Hollow glass microsphere (HGM) filled jute composites were fabricated using woven comingled fabric. Tensile, drop weight impact and Charpy impact tests were conducted to study the effects of HGM to the jute laminates. The tensile properties were enhanced with the addition of 1.5 % HGM (19 % tensile strength and 6 % modulus) while further addition of HGM up to 3 % decreased the tensile properties (16 % tensile strength and 19 % modulus). The impact strength was improved by 10 % with the incorporation of 1.5 % HGM and an increase of 19 % was observed in the 3 % HGM composites compared to the control composites.
Mechanical Enhancement and Thermal Stability of Composites between Polyamide 11 and Functionalized Graphene Nanoplatelets
Authors: Hongsriphan Nattakarn , Somboon Kantika , Paujai Chutikan , Taengto Thitichaya
Published: August 2020

The composites between polyamide 11 (PA11) and functionalized graphene nanoplatelets (GNP) were prepared to compare influence of GNPs content and functionalities; hydroxyl (GO) and carboxylic acid (GC); on mechanical and thermal properties. The composites were melt compounded and injection molded into specimens with the final GNP content of 1, 3, 5, 7 and 9 wt%. It was found in XRD that these plasma-exfoliated GNPs acted as the nucleating agents that changed the crystal form of PA11, but did not have significant influence on crystallinity content. DSC analysis confirmed the nucleating effect of GNPs, which the degree of crystallinity was not affected by the presence of GNPs. The functionalities of GNP did not reduce the degradation temperature of the composites compared to neat PA11. Young's modulus and tensile strength at yield of the composites were higher with respect to the GNP content. This was attributed to stretching restriction of polymer chains by GNPs during the elastic deformation. The composites adding GO had higher tensile properties than those adding GC. In contrast, the composites adding GC showed higher impact strength than those adding GO. SEM micrographs indicated the failure of the composites occurred at the interphase between PA11 matrix and GNPs.
Fabrication and Experimental Investigation on Tensile and Flexural Properties for Different Stacking Sequence of Jute and Carbon Fiber Reinforced Epoxy Composite
Authors: Sujon Abu Shaid , Supto Tahamir Hasan , Shariar Fahim , Pallab Md Mushfiqur Rahman , Zoynal Abedin Mohammad , Ahsan Habib Mohammad
Published: August 2020

The consequence of placing a different layer of jute and carbon fiber in different position inside the composite has been experimentally investigated. Six layers of woven unidirectional jute fiber and four-layer of carbon fiber has been used with five different stacking sequences in this study. Vacuum Assisted Resin Infusion (VARI) technology has been used for the manufacturing of the composite. After analyzing the results of the tensile and flexural test of the composites, it shows that the stacking sequence has a significant effect on those properties of the composites. Tensile strength of the composites was upgraded when all the layers of carbon fiber were placed in the middle of the sandwich-like composite structure whereas flexural strength of the composites was improved when carbon fibers were placed on the compression and tension side of the composite.
Effect of Impregnation Process Parameters on the Mechanical Properties of Carbon Fabric Reinforced Thermoplastic Composites
Authors: Kim Dae Won , Park Jun , Jin Chul Kyu , Seo Hyung Yoon , Kang Chung Gil
Published: August 2020

Carbon fabric-reinforced thermoplastic (CFRP) composites, fortified with carbon fiber prepreg and epoxy base materials, have been mainly used for body parts for weight lightening, advanced high strength, and impact absorption In the current automotive industry However, as recycling of the composite material is required, attempts have been made to manufacture body parts using a thermoplastic polymeric material as a base substance. In order to produce various types of body parts by impregnating a liquid thermoplastic material into carbon fabric preform in methods of manufacturing a carbon fiber-reinforced thermoplastic composite material (CFRTP), it is important to understand the effect of the impregnation process parameters (time, temperature, pressing force) on the mechanical properties of the composite material. Therefore, in this study, the influence of impregnation process parameters on the mechanical properties of CFRTP is proposed. In addition, this paper presents the problems and solutions when polymeric materials are impregnated in carbon fabric.
Effect of Lamination Direction on the AE Behavior of 3D Printed Specimen during Tensile Testing
Authors: Mizobe Koshiro , Matsueda Takahiro , Kida Katsuyuki
Published: August 2020

Additive manufacturing (AM) methods have become popular but the fracture mechanism of products made by AM is not well understood. In particular, the fracture of parts made by 3D printing needs more investigation. We have already investigated the effect of the lamination direction on the fractures in bearing specimens. In this study, we made some specimens by using a 3D printing method and performed some tensile tests. We investigated the effect of the lamination direction on the Young’s modulus of the specimens and tried to detect inner defect initiation using an acoustic emission (AE) sensor.
Mechanical Characterization of a Masonry System Made of Alkaline Activated Pozzolana Blocks
Authors: Salirrosas Jorge , Silva Guido , Kim Suyeon , Nakamatsu Javier , Bertolotti Bruno , Aguilar Rafael
Published: August 2020

The development of alkaline activated materials has enabled the production of eco-friendly alternatives for the construction industry. In the present article, the mechanical characterization of a new structural masonry system composed of fiber-reinforced lightweight pozzolana-based blocks and cement-lime mortar was performed. The mechanical characterization involved uniaxial compression tests in prisms and diagonal compression in wallets. The results indicate that the compressive and shear strength of the masonry system is up to 3.24 MPa and 0.38, respectively. The results obtained indicate that the evaluated system is structurally efficient and that can be used as both non-load and load-bearing walls.
A Study of Thermal Conductivity Property of Socks
Authors: Wang Wen Yi , Hui Kwok Tung , Kan Chi Wai , Visesphan Krailerck , Areechongchareon Saowanee , Tiyasri Somporn , Mongkholrattanasit Rattanaphol
Published: August 2020

Socks fabrics seem a minor clothing in apparel categories but are indispensable item for daily activities for users. The function of socks is either for heat insulation of body temperature in cold weather or heat releasing to keep thermal neutral for foot in hot weather. Socks with good quality are conducive to prevent foot disease or smelly odor from foot. The wearing comfort of socks can be affected by the fabric properties of thermal transfer. The present study aims to investigate the relationship between the fabric parameters and thermal conductivity property of knitted socks fabric. The physical test on commercial socks fabric was carried out in standard condition atmosphere. It was found that the thermal conductivity of fabric was positively proportional to yarn count and thickness.
Characterization of Semi-Refined Carrageenan Reinforced with Cellulose Nanofiber Incorporated α-Tocopherol for Active Food Packaging Applications
Authors: Wan Yahaya Wan Amnin , Raja Ahmad Raja Nurliyana , Mohd Azman Nurul Aini
Published: August 2020

This work focuses on the development of biodegradable active films packaging using natural compounds by reducing the plastic waste to environment but also as a potential substitute of synthetic preservative in food. Active film packaging was formulated using semi-refined carrageenan (SRC) biopolymer plasticized with glycerol (G), reinforced with different concentrations cellulose nanofiber (CNF) at 0 to 13% w/w incorporated 0.4% w/w α-tocopherol as natural antioxidants. Physical and mechanical properties of the film samples were analyzed. Active films reinforced CNF enhanced overall the tensile strength and the value of elongation at break significantly (p<0.05). Film samples reinforced with 10% w/w CNF improved the value of opacity, thickness, films solubility (%) and moisture content (%) with (5.60±0.14, 0.139 ±0.02, 27.89±2.41 and 18.88±1.06) respectively. In summary, an active film with 10% w/w CNF showed highest improvement on the mechanical and physical properties due to the uniform dispersion between CNF-SRC matrix interactions. Hence, the new formulation of active packaging film with showed competitive properties that could be an alternative solution for biodegradable films with function of food protection against oxidative degeneration.
Effect of Si and Mn Addition on Fluidity, Mechanical Property and Casting Crack in Die Casting
Authors: Fuse Hiroshi , Imamura Shinichiro , Haga Toshio
Published: August 2020

The effects Si and Mn addition on the fluidity length, mechanical properties, and casting cracks of a die-cast Al-4.5%Mg alloy were investigated. The Si content was 1, 2, or 3 mass% and the Mn content was 0.3, 0.6, or 0.9 mass%. Both Si and Mn did not affect fluidity. Si content of more than 1 mass% improved casting crack resistance. The effect of Mn on casting cracks was weaker than that of Si. When Si content was 2 mass%, both tensile stress and elongation were good. Mn did not affect the mechanical properties.
Casting of Clad Strip Consisting of Al-Sn Alloy and Pure Aluminum
Authors: Haga Toshio
Published: August 2020

Casting of clad strip consisting of Al-40%Sn-1%Cu alloy and 1050 pure aluminum from molten metals was attempted using an unequal diameter twin-roll caster equipped with a scraper. The liquidus line and solidus line of the Al-40% Sn-1% Cu alloy are 620 °C and 220 °C, respectively. The liquidus line and solidus line of the 1050 are 657 °C and 646 °C, respectively. Therefore, solidification temperatures of the two aluminum alloys are much different. When an Al-40%Sn-1%Cu solidification layer was bonded to a solidification layer of the 1050 alloy, the temperature of the 1050 solidification layer surface was higher than the solidus line of Al-40% Sn-1% Cu. However, the Al-40% Sn-1% Cu alloy could be bonded to the 1050 strip and a two-layer clad strip could be cast. The interface between the two strips was very clear. Electron Probe Microanalysis (EPMA) indicated that Sn in the Al-40% Sn-1% Cu alloy did not diffuse into the 1050 alloy. Tensile shear tests were conducted using the as cast clad strip, and no breakage occurred at the interface between the strips but only in the Al-40% Sn-1% Cu layer. This result confirmed that the two strips were strongly bonded at the interface.
Globular Crystals in the Center of Roll Cast Aluminum Alloy Strips
Authors: Haga Toshio , Tsuchida Maho , Sakata Hirotaka , Watari Hisaki , Nishida Shinichi
Published: August 2020

This study investigated the crystallization position and formation mechanism of globular crystals at the center area in the thickness direction of aluminum alloy strips cast by a high-speed twin roll caster. Twin roll casters for single strips and clad strips were used, as well as twin roll casters equipped with a cooling slope. The globular crystals were formed from dividing arms of dendrites of the solidified layer facing the center area at the roll gap. The arms of isolated dendrite also divided. No globular crystals were formed at the interfaces of clad strips with different solidification temperatures because of the temperature gradient at the interface which inhibited division of the dendrite arms. It was demonstrated that globular crystals at the center area of the thickness direction were formed by dendrite-arm-dividing at the roll gap by the strip casting clad strip. Experiments by semisolid-strip casting with the cooling slope showed that globular crystals in the molten metal existed in the solidification layers.
Mechanochemical Synthesis of Zinc Oxide Nanoparticles and their Antibacterial Activity against Escherichia Coli
Authors: Nguyen Tuan Anh , Mai Thi Yen , Nguyen Truong Xuan Minh , Huynh Ky Phuong Ha , Le Minh Vien , Nguyen T. Anh Nga
Published: August 2020

Crystalline ZnO nanoparticles were synthesized by a mechanochemical method using zinc acetate dihydrate and sodium hydroxide as starting materials, and cetyl trimethylammonium bromide (CTAB) as a protective agent. Mechanochemical activation of the solid-state reaction was achieved at low temperatures in a rapid laboratory ball mill. A three-level full factorial experimental design was used to investigate the effect of milling time and surfactant ratio on ZnO crystallite size. The product powders were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The crystallite size of ZnO samples estimated from XRD is consistent with the SEM images and found to be less than 40 nm. The crystallite size of the ZnO decreased as the surfactant ratio increased. There is an optimal milling time of 60 minutes in order to obtain ZnO nanoparticles with the smallest average grain size. The antibacterial activity of the obtained products against Escherichia coli (E. coli) was examined, and the minimum inhibitory concentration value was 5 mg/mL. ZnO synthesized by this simple method can be considered potentially as an effective bactericidal agent.
Reduction of Surface Cracks at Al-Mg Alloy Strip Surface Cast by Unequal Diameter Twin Roll Caster
Authors: Haga Toshio , Yamazaki Kazuki , Watari Hisaki , Nishida Shinichi
Published: August 2020

Al-Mg alloy strips were cast by an unequal-diameter twin-roll caster. It was found that cracks formed on the surface at grain boundaries. The grains near the surface were small in size, which likely contributed to crack formation. The use of a molten metal pouring method to increase the grain size near the surface is proposed to reduce cracks. In the previous method, molten metal is poured into a pool, which is on the lower roll surrounded by side-dam plates, a back-dam plate, and the upper roll. In this study, molten metal was directly poured onto the roll surface at a shallow angle using a launder. When the angle was smaller than 20°, cracks did not form. With the proposed method, the heat transfers between the molten metal and the roll surface decreased, as determined from the grain size and strip thickness. The cracks on the strip surface were color-checked and visually inspected.
Synthesis of Magnetically Separable Activated Carbon from Pineapple Crown Leaf for Zinc Ion Removal
Authors: Astuti Widi , Sulistyaningsih Triastuti , Prastiyanto Dhidik , Purba Bernadetta Sisca Aprillia , Kusumawardani Restu
Published: August 2020

Metals removal from wastewater has become a major concern over the years due to the adverse effects of metals on organisms and environment. Adsorption is one of the safest, simplest, and most cost-effective methods for metals removal. The primary purpose of this study was to develop a magnetically separable activated carbon from pineapple crown leaf for zinc removal. Magnetic activated carbon (MAC) were characterized by SEM-EDX and FTIR. The ability of MAC to adsorb zinc ion was studied through variation of initial solution pH, concentration, and contact time. The optimum pH for zinc removal was four, while the equilibrium was reached after 180 min. In this condition, the percentage removal of zinc was 70.5%.
An Innovative Method of Voided Reinforced Concrete One-Way Slabs Using Bundled Waste PET Bottled Tubes
Authors: Mohammed Majid S. , Ahmed Mohammed L. , Ali Ziadoon M. , Mahmoud Akram S.
Published: August 2020

Sustainability in concrete structure has been developed rapidly for ensuring the requested for a new thinking about construction by concrete elements. This paper deals with using buddle using polyethylene terephthalate PET bottles and steel meshes for fabricating and modeling one way RC voided slab. That is very useful to reduce the weight of slab, also reduced the wastes in same time. For both the voided and solid ones, the load-displacement curves were almost identical from beginning until the load reaches ultimate stages, where the increasing in depth of voided slab showed higher strengths and lower displacement at same load level.
Community participation during Covid-19
Authors: Sathiadas M. G.
Published: August 2020

No abstract available
Challenges in the Development of Therapeutics and Vaccines for Covid 19
Authors: Sreeharan Nadarajah
Published: August 2020

No abstract available
Cutaneous Larva Migrans on the Abdomen of a Child with Delayed Gross Motor Development
Authors: Thadchanamoorthy V. , Dayasiri K.
Published: August 2020

Cutaneous larva migrans is a tropically acquired parasitic infection caused mostly by the larvae of Ancylostoma braziliense and Ancylostoma caninum. We report a child with an unusual presentation of cutaneous larva migrans infection on her abdominal wall. The reported child with delayed gross-motor development presented to the pediatric clinic with a history of irritable cry and poor sleep for one-month duration. She could only roll-over on cemented floor in her house which had poor infrastructure facilities and also had several pets which frequently entered into the house. Examination revealed linear erythematous lesion on abdominal wall compatible with clinical diagnosis of cutaneous larva migrans. The child responded well to a seven-day course of Albendazole.
Cardiogenic Shock with Severe Myocardial Injury: A Rare Presentation of Leptospirosis
Authors: Perera I. A. , Lakshman P. , Kumanan T. , Suganthan N.
Published: August 2020

Leptospirosis is a common zoonotic disease of the tropics, caused by pathogenic spirochetes of the genus Leptospira. Though infection tends to be mild and self limiting in most cases, it is known to cause life threatening complications such as acute kidney injury, pulmonary haemorrhages and acute respiratory distress syndrome, myocarditis and rhabdomyolysis. Severe myocarditis leading to cardiogenic shock with circulatory collapse in leptospirosis is a rare clinical entity. Here we describe a young healthy male, who presented with extensive myocardial injury with cardiogenic shock, and made an uneventful recovery with timely intervention and care.
IκBα Nuclear Export Enables 4-1BB–Induced cRel Activation and IL-2 Production to Promote CD8 T Cell Immunity
Authors: Lisiero Dominique N. , Cheng Zhang , Tejera Melba M. , Neldner Brandon T. , Warrick Jay W. , Wuerzberger-Davis Shelly M. , Hoffmann Alexander , Suresh M. , Miyamoto Shigeki
Published: August 2020

Optimal CD8 T cell immunity is orchestrated by signaling events initiated by TCR recognition of peptide Ag in concert with signals from molecules such as CD28 and 4-1BB. The molecular mechanisms underlying the temporal and spatial signaling dynamics in CD8 T cells remain incompletely understood. In this study, we show that stimulation of naive CD8 T cells with agonistic CD3 and CD28 Abs, mimicking TCR and costimulatory signals, coordinately induces 4-1BB and cRel to enable elevated cytosolic cRel:IκBα complex formation and subsequent 4-1BB–induced IκBα degradation, sustained cRel activation, heightened IL-2 production and T cell expansion. NfkbiaNES/NES CD8 T cells harboring a mutated IκBα nuclear export sequence abnormally accumulate inactive cRel:IκBα complexes in the nucleus following stimulation with agonistic anti-CD3 and anti-CD28 Abs, rendering them resistant to 4-1BB induced signaling and a disrupted chain of events necessary for efficient T cell expansion. Consequently, CD8 T cells in NfkbiaNES/NES mice poorly expand during viral infection, and this can be overcome by exogenous IL-2 administration. Consistent with cell-based data, adoptive transfer experiments demonstrated that the antiviral CD8 T cell defect in NfkbiaNES/NES mice was cell intrinsic. Thus, these results reveal that IκBα, via its unique nuclear export function, enables, rather than inhibits 4-1BB–induced cRel activation and IL-2 production to facilitate optimal CD8 T cell immunity.
Factors Influencing a Student's Choice of a Graduate Professional Athletic Training Program
Authors: Dearie Alyson , Van Langen Deborah , Cavallario Julie M. , Comins Sonya A.
Published: August 2020

Context

As the professional degree in athletic training transitions to the master's level, a growing concern for programs is enrollment. Understanding the factors that influence a student's choice of a graduate program in athletic training will provide institutions with vital information for marketing and enrollment management.

Objective

To explore factors that influence a student's choice of a professional graduate athletic training program.

Design

Cross-sectional.

Setting

Online survey.

Patients or Other Participants

A total of 52 participants from a convenience sample of 140 graduate students enrolled in a graduate professional athletic training program completed the survey: 43 females (82.7%) and 9 males (17.3%).

Data Collection and Analysis

Data collection took place over 4 weeks between April and May 2019. Participants completed an online questionnaire that consisted of 11 demographic items, 6 Likert-scale items about factors that may have influenced school choice, and 2 open-ended questions about career goals and pursuing a doctoral degree. We calculated descriptive statistics, frequency distributions, and percentages.

Results

Factors ranked as very important in influencing a student's choice fell within the categories of athletic training program and athletic training program faculty. Those ranked as not important were related to ethnicity and gender. Additionally, over half of the participants indicated an intended career path within the college or professional setting.

Conclusions

Although a variety of factors can influence a student's choice of graduate school, today's consumer seems mostly interested in program factors such as Board of Certification pass rate, accreditation status, and clinical sites. As programs transition to the graduate level, marketing and recruitment strategies should be designed around these factors to ensure enrollment.
A child with a rare presentation of ocular bartonellosis
Authors: Shariffudin Nor Syahira , Min Teh Wee , Adnan Azian , Hashim Hanizasurana , Teo Khairy Shamel Sonny
Published: August 2020

A 6-year-old boy was referred from the optometrist for bilateral painless blurred vision of 2 weeks duration during routine screening. Upon examination, best-corrected visual acuity was 20/200 (right eye) and 20/120 (left eye). Anterior segment examination was normal for both eyes. Funduscopy showed bilateral optic disc swelling with peripapillary exudates and diffuse retinochoroiditis involving the posterior pole. Optical coherence tomography revealed diffuse retinal thickening with intraretinal fluids and cystoid changes of central fovea. Fluorescein angiography showed bilateral hot discs with vasculitis in all quadrants and large areas of nonperfusion at peripheral retina. The patient was initially treated as presumed ocular tuberculosis (TB) based on clinical presentation and history of contact with family member having pulmonary TB. Antituberculous therapy was started and both eyes received panretinal laser photocoagulation. After 3 weeks of anti-TB treatment, serology for Bartonella turned out to be positive. Treatment was changed to intravenous ceftriaxone for 10 days followed by oral cotrimoxazole for 6 weeks and combined treatment with oral prednisolone. Gradual clinical improvement was seen with corresponding visual gain due to the reduction of macular edema, but residual thickening remained due to its chronicity.
Criteria for periodicity and an application to elliptic functions
Authors: de Shalit Ehud
Published: August 2020

LetPandQbe relatively prime integers greater than 1, and letfbe a real valued discretely supported function on a finite dimensional real vector spaceV. We prove that if$f_{P}(x)=f(Px)-f(x)$and$f_{Q}(x)=f(Qx)-f(x)$are both$\Lambda $-periodic for some lattice$\Lambda \subset V$, then so isf(up to a modification at$0$). This result is used to prove a theorem on the arithmetic of elliptic function fields. In the last section, we discuss the higher rank analogue of this theorem and explain why it fails in rank 2. A full discussion of the higher rank case will appear in a forthcoming work.
Conceito de Identidade e sua Contribuição na Formação de Professores de Matemática
Authors: De Albuquerque Andréa Souza , Gonçalves Tadeu Oliver
Published: August 2020

O objetivo deste artigo é analisar como Hall (2004), Ciampa (2001) e Dubar (2006) apresentam o conceito de identidade, a fim de fazer uma análise a partir deste conceito, sobretudo, em torno de suas contribuições para as propostas de formação continuada de professores de matemática no que concerne à identidade pessoal e profissional destes docentes. Para tratar da formação de professores de matemática, tomamos como referência Fiorentini e Oliveira (2013) e Nóvoa (1992) para tratar da formação continuada. O estudo foi realizado por meio da uma pesquisa bibliográfica, e o tratamento metodológico da pesquisa foi de tipologia qualitativa. Dessa forma, o estudo aponta diferentes perspectivas a respeito do conceito de identidade, ao mesmo tempo em que os autores convergem quanto a transformações sociais, o que gera crises constantes, acarretando tanto a alteração na ideia de identidades pessoais fixas e imutáveis quanto a necessidade de revisão das identidades pessoais e profissionais, principalmente as relacionadas à formação profissional de professores de matemática.
Análise dos Parâmetros de Itens de Matemática à luz da Teoria Clássica dos Testes (TCT) e da Teoria de Resposta ao Item (TRI)
Authors: Melo Andrade Wendel , Carvalho Brandão Jorge , Costa dos Santos Maria José
Published: August 2020

Objetiva-se com este artigo analisar os parâmetros de itens de matemática praticados nas avaliações externas, fundamentando-se nos pressupostos da TCT e da TRI. O procedimento metodológico utilizado contou com elementos de pesquisa bibliográfica e de pesquisa documental, por meio da realização de uma análise de itens do 5o ano do ensino fundamental, publicados em boletim pedagógico. Dentre os parâmetros estudados, destaca-se a capacidade de discriminação do item, a habilidade necessária para respondê-lo e a probabilidade de resposta correta dada por respondentes de baixa habilidade. Nas análises, foram considerados os preceitos da unidimensionalidade e interdependência local, a habilidade do respondente e os índices de discriminação, de dificuldade e de coeficiente bisserial. Percebeu-se que os procedimentos oriundos da TCT e da TRI possibilitam a identificação da proficiência do estudante, pois é possível estabelecer uma relação entre a probabilidade de um aluno responder corretamente a um item e suas habilidades na área do conhecimento avaliado.