bluuebunny/crossref_metadata_2025 huggingface dataset:
ANALISIS ABNORMAL RETURN , TRADING VOLUME ACTIVITY DAN FOREIGN CAPITAL INFLOW SEBELUM DAN SESUDAH PEMILIHAN PRESIDEN DAN PEMILIHAN LEGISLATIF TAHUN 2019 (STUDI PADA PERUSAHAAN ANGGOTA INDEKS KOMPAS100 DI BURSA EFEK INDONESIA)
Authors: Dewi I Gusti Ayu Agung Omika
Published: June 2020

Analisis Abnornal Return, Trading Volume Activity dan Foreign Capital Inflow Sebelum dan Sesudah Pemilihan Presiden dan Pemilihan Legislatif Tahun 2019 (Studi pada Perusahaan Anggota Indeks Kompas 100 di Bursa Efek Indonesia)Penelitian ini bertujuan untuk mengetahui adanya perbedaan abnormal return, trading volume activity, dan foreign capital inflow sebelum dan sesudah pemilihan presiden dan pemilihan legislatif tahun 2019 pada perusahaan anggota indeks Kompas 100 di Bursa Efek Indonesia. Penelitian ini merupakan event study yang menggunakan Signaling Theory sebagai upaya untuk menjelaskan reaksi pasar terhadap event pemilihan presiden dan pemilihan legislatif tahun 2019 (election day). Data penelitian yang digunakan adalah data sekunder dengan teknik pengumpulan data menggunakan studi dokumentasi, dan teknik pengambilan sampel menggunakan Purposive Sampling. Data yang diperoleh kemudian diolah dan dianalisis menggunakan uji beda T-Test (Wilcoxon Signed Rank Test). Hasil analisis data menemukan bahwa: (1) Abnormal Return sebelum dan sesudah pemilihan presiden dan pemilihan legislatif tahun 2019 menunjukkan perbedaan yang signifikan; dimana sesudah election day Abnormal Return mengalami peningkatan ke arah positif dibandingkan sebelum election day; (2) Trading Volume Activity sebelum dan sesudah pemilihan presiden dan pemilihan legislatif tahun 2019 tidak menunjukkan perbedaan yang signifikan, dimana sebelum dan sesudah election day, Trading Volume Activity memiliki rata-rata yang sama-sama tinggi; (3) Foreign Capital Inflow sebelum dan sesudah pemilihan presiden dan pemilihan legislatif tahun 2019 menunjukkan perbedaan yang signifikan, dimana sesudah election day, Foreign Capital Inflow mengalami peningkatan dilihat dari peningkatan jumlah investor asing yang menanamkan modalnya melalui saham. Kata Kunci: Abnormal Return, Trading Volume Activity, Foreign Capital Inflow, Election Day
Coronal Magnetic Field Topology from Total Solar Eclipse Observations
Authors: Boe Benjamin , Habbal Shadia , Druckmüller Miloslav
Published: June 2020

Measuring the global magnetic field of the solar corona remains exceptionally challenging. The fine-scale density structures observed in white-light images taken during total solar eclipses are currently the best proxies for inferring the magnetic field direction in the corona from the solar limb out to several solar radii (R
⊙). We present, for the first time, the topology of the coronal magnetic field continuously between 1 and 6 R
⊙, as quantitatively inferred with the rolling Hough transform for 14 unique eclipse coronae that span almost two complete solar cycles. We find that the direction of the coronal magnetic field does not become radial until at least 3 R
⊙, with a high variance between 1.5 and 3 R
⊙ at different latitudes and phases of the solar cycle. We find that the most nonradial coronal field topologies occur above regions with weaker magnetic field strengths in the photosphere, while stronger photospheric fields are associated with highly radial field lines in the corona. In addition, we find an abundance of field lines that extend continuously from the solar surface out to several solar radii at all latitudes, regardless of the presence of coronal holes. These results have implications for testing and constraining coronal magnetic field models, and for linking in situ solar wind measurements to their sources at the Sun.
SN 2013aa and SN 2017cbv: Two Sibling Type Ia Supernovae in the Spiral Galaxy NGC 5643
Authors: Burns Christopher R. , Ashall Chris , Contreras Carlos , Brown Peter , Stritzinger Maximilian , Phillips M. M. , Flores Ricardo , Suntzeff Nicholas B. , Hsiao Eric Y. , Uddin Syed , Simon Joshua D. , Krisciunas Kevin , Campillay Abdo , Foley Ryan J. , Freedman Wendy L. , Galbany Lluís , González Consuelo , Hoeflich Peter , Holmbo S. , Kilpatrick Charles D. , Kirshner Robert P. , Morrell Nidia , Muñoz-Elgueta Nahir , Piro Anthony L. , Rojas-Bravo César , Sand David , Vargas-González Jaime , Ulloa Natalie , Vilchez Jorge Anais
Published: June 2020

We present photometric and spectroscopic observations of SN 2013aa and SN 2017cbv, two nearly identical type Ia supernovae (SNe Ia) in the host galaxy NGC 5643. The optical photometry has been obtained using the same telescope and instruments used by the Carnegie Supernova Project. This eliminates most instrumental systematics and provides light curves in a stable and well-understood photometric system. Having the same host galaxy also eliminates systematics due to distance and peculiar velocity, providing an opportunity to directly test the relative precision of SNe Ia as standard candles. The two SNe have nearly identical decline rates, negligible reddenings, and remarkably similar spectra, and, at a distance of ∼20 Mpc, they are ideal potential calibrators for the absolute distance using primary indicators such as Cepheid variables. We discuss to what extent these two SNe can be considered twins and compare them with other supernova “siblings” in the literature and their likely progenitor scenarios. Using 12 galaxies that hosted two or more SNe Ia, we find that when using SNe Ia, and after accounting for all sources of observational error, one gets consistency in distance to 3%.
On the Relation between the Hard X-Ray Photon Index and Accretion Rate for Super-Eddington Accreting Quasars
Authors: Huang Jian , Luo Bin , Du Pu , Hu Chen , Wang Jian-Min , Li Yi-Jia
Published: June 2020

We investigate whether the correlation between the hard X-ray photon index (

) and accretion rate for super-Eddington accreting quasars is different from that for sub-Eddington accreting quasars. We construct a sample of 113 bright quasars from the Sloan Digital Sky Survey Data Release 14 quasar catalog, with 38 quasars as the super-Eddington subsample and 75 quasars as the sub-Eddington subsample. We derive black hole masses using a simple-epoch virial mass formula based on the

lines, and we use the standard thin disk model to derive the dimensionless accretion rates (

) for our sample. The X-ray data for these quasars are collected from the Chandra and XMM-Newton archives. We fit the hard X-ray spectra using a single power-law model to obtain

values. We find a statistically significant (

,

) correlation between

and

for the super-Eddington subsample. The

–

correlation for the sub-Eddington subsample is also significant, but weaker (

,

). Linear regression analysis shows that

and

for the super- and sub-Eddington subsamples, respectively. The

–

correlations of the two subsamples are different, suggesting different disk–corona connections in these two types of systems. We propose one qualitative explanation of the steeper

–

correlation in the super-Eddington regime that involves larger seed photon fluxes received by the compact coronae from the thick disks in super-Eddington accreting quasars.
Hα Luminosity of ATLAS18qtd Does Not Plateau in the Nebular Phase
Authors: Tucker Michael A. , Shappee Benjamin J.
Published: June 2020

We present new spectroscopic and photometric observations of ATLAS18qtd/SN 2018cqj, a fast-declining SN Ia with variable Hα emission in previously published nebular phase spectra. ATLAS18qtd is undetected in both spectroscopic and photometric observations which occurred at ∼540 days after maximum light and ∼230 days after the last Hα detection. With these new non-detections, we place an upper limit on the Hα luminosity of

≲
1.1
×

10

36

erg

s

−
1

indicating the Hα flux decreased by a factor of

≳
4

since the previous detection. This upper limit excludes Hα emission that plateaus or increases since the previous detection but cannot confirm that the Hα emission decay rate is equivalent to the supernova decay rate.
Senecio festucoides (Senecioneae, Compositae), a new species from northern Chile
Authors: Calvo Joel , Moreira-Muñoz Andrés
Published: June 2020

Senecio festucoides is described from northern Chile. The new species is morphologically similar to the discoid caespitose Andean species and belongs to the subgroup displaying yellow corollas and yellowish anthers and style branches. It is characterized by a weak, not self-supporting stem, narrowly linear leaves, long pedunculate capitula with (17–)21 involucral bracts, and minutely papillose achenes. Among other characters, the color of the corollas, anthers, and style branches and the number of involucral bracts differentiate it from S. scorzonerifolius, which is the morphologically closest species. The new species thrives in the desertic Puna ecoregion and grows amongst tufts of Festuca chrysophylla (Poaceae). Detailed pictures of living plants are provided, as well as a distribution map and a dichotomous key to the discoid caespitose Senecio species from northern Chile.
Donor Screening for Fecal Microbiota Transplantation
Authors: Lee Han Hee , Cho Young-Seok
Published: June 2020

Fecal microbiota transplantation (FMT), which has been established as the standard treatment for recurrent Clostroides difficile infection, may also play a role in the management of other diseases associated with dysbiosis of the gut microbiota. To ensure efficacy and safety of FMT, an appropriate donor screening process is required. The main purpose of donor screening is to check for infectious diseases that could be transmitted to the recipient. The screening process involves a medical history questionnaire, and blood and stool testing. Several randomized clinical trials and large case series on FMT reported no, or few, adverse events related to infection by following this donor screening process. However, there is still concern over the transmission of antibiotic-resistant bacteria. In addition, a low donor acceptance rate due to rigorous screening makes donor recruitment difficult, and also imposes a significant cost burden. A consensus on the most crucial elements of donor screening is needed for wide application of FMT.
Predictors of Ischemic Cardiomyopathy in Patients with Acute Myocardial Infarction who Underwent Percutaneous Coronary Intervention
Authors: Kim Hye Sook , Jeong Myung Ho , Yoon Hyun Ju , Kim Yongcheol , Sohn Seok-Joon , Kim Min Chul , Sim Doo Sun , Hong Young Joon , Kim Ju Han , Ahn Youngkeun , Cho Jae Young , Kim Kye Hun , Park Jong Chun
Published: June 2020

Background/Aims: Many patients with acute myocardial infarction (AMI) suffer from heart failure due to progressive ischemic left ventricular (LV) remodeling. This study investigated the predictors of ischemic cardiomyopathy (ICMP) in patients with AMI who underwent successful percutaneous intervention.Methods: A total of 547 patients with AMI were divided into two groups: ICMP (n = 66, 67.1 ± 11.9 years, 78.8% males) and non-ICMP (n = 481, 62.5 ± 12.2 years, 70.1% males).Results: On echocardiography, the LVEF was significantly decreased (41.7 ± 10.5 vs. 55.4 ± 10.3%, p < 0.001) but the LV end-diastolic (54.1 ± 7.2 vs. 49.3 ± 5.3 mm, p < 0.001) and systolic (42.1 ± 8.0 vs. 33.5 ± 6.0 mm, p < 0.001) dimensions significantly increased in the ICMP group compared with the non-ICMP group. According to multivariate logistic regression analysis, LVEF < 50% (odds ratio [OR] 8.722, 95% confidence interval [CI] 2.986–25.478, p < 0.001), LV end-diastolic dimension > 55 mm (OR 4.511, 95% CI 1.561–13.038, p = 0.005), and ratio of early mitral inflow velocity to mitral annular early diastolic velocity (E/e’) ≥ 15 (OR 3.270, 95% CI 1.168–9.155, p = 0.024) were independent predictors of ICMP development.Conclusions: The present study demonstrates that a larger LV size, lower LV function, and increased E/e’ (≥ 15) were independent predictors of ICMP. Therefore, the development of ICMP should be carefully monitored in AMI patients with these features.
La Bible en Magasin
Authors: Brucker Nicolas
Published: June 2020

Les Magasins de Marie Leprince de Beaumont, généralement omis dans les travaux portant sur « Bible et éducation », sont à situer entre le catéchisme historique et la Bible pour la jeunesse. Au prix d’un important travail de réécriture, le texte biblique y est adapté à un usage pédagogique précis. Il occupe dans les Magasins une place majeure, non seulement quantitativement, mais aussi structurellement : l’herméneutique biblique détermine la composition du livre et oriente sa lecture.
La spiritualité à l’école laïque : donner forme au sentiment de l’infini
Authors: Lamarre Jean-Marc
Published: June 2020

L’école laïque s’est instituée en excluant la religion et la spiritualité (assimilée à la religion). Mais aujourd’hui le problème des rapports entre la laïcité et la spiritualité se pose à nouveau. Il y a place à l’école laïque pour la spiritualité distincte de la religion. À l’origine (Quinet, Buisson, Jaurès), la laïcité est une laïcité spirituelle et l’école républicaine est une école sans religion mais pas sans spiritualité. En différenciant le religieux, la religion et la spiritualité, on peut distinguer trois temps, ceux de la religion, de la sortie de la religion, de la spiritualité. Aujourd’hui, dans ce temps de la spiritualité, l’école laïque peut jouer un rôle important en faisant place à la spiritualité de l’infini par l’éducation au sublime à travers les grandes œuvres poétiques, littéraires et artistiques.
Une conception laïque de la spiritualitépour l’École publique : éducation à la responsabilité, aux valeurs et vulnérabilité du sujet
Authors: Hagège Hélène
Published: June 2020

Partant du constat que l’École publique française met plutôt en œuvre des valeurs implicites d’exclusion et d’élitisme contraires aux valeurs de la République, nous explorons l’hypothèse que ces dernières pourraient être favorisées via l’inclusion curriculaire d’une éducation laïque à la spiritualité. Dans une première partie, nous proposons des bases théoriques pour définir opérationnellement la spiritualité en éducation, en l’ancrant dans celle de la responsabilité. Ainsi une hypothèse gnoséologique nous permet de concevoir la spiritualité comme une transformation de l’esprit et du rapport conscience – monde. Dans une deuxième partie, nous montrons le caractère laïque de cette dernière après avoir discuté le lien entre les notions plurivoques de laïcité et d’éthique. Puis, dans une troisième partie, nous envisageons le rôle d’une éducation aux valeurs et de la vulnérabilité du sujet dans cette éducation à la spiritualité. Pour conclure, nous suggérons des pistes concernant des approches pédagogiques efficaces, en termes de spiritualité et de promotion concrète des valeurs de la République.
Non-Invasive Ventilation in Alveolar Obesity-Hypoventilation Syndrome
Authors: Pires Rute
Published: June 2020

Obesity is the main risk factor for several sleep breathing disorders, including obstructive sleep apnea syndrome (OSAS), either alone or associated with chronic obstructive pulmonary disease (COPD), and alveolar obesity-hypoventilation syndrome (AOHS). In several of these conditions, the indicated treatment includes the use of non-invasive ventilation during sleep, such as the use of continuous positive airway pressure (continuous positive airway pressure or CPAP) and two-level pressure (BIPAP, bi-level positive airway pressure). In this chapter, a brief review is made of what the most recent studies say regarding the treatment of SOHA with non-invasive ventilation (NIV), comparing different ventilation modes and/or treatments.
Ambulatory Oxygen Therapy From Narrative-Based Medicine
Authors: Cipriano-Crespo Carmen , Conde-Caballero David , Sánchez-García Pablo , Mariano-Juárez Lorenzo
Published: June 2020

Oxygen therapy consists on administering oxygen at a higher concentration than that found in the air in order to treat problems due to respiratory failure. When the oxygen therapy treatment is not necessary to administer in the hospital, within a hospital admission, it can be prescribed for the patient to receive at home, referred to as continuous home oxygen therapy. This type of therapy has great advantages for patients and their families because it allows them to stay together longer. But there are also important difficulties to be taken into account that have to do with the handling of the devices that are used for the administration of oxygen, as well as the compliance or not of the time prescribed by the health professional.
Outpatient Oxygen Therapy, Illness Experience, and Mental Health
Authors: Sánchez-García Pablo , Conde-Caballero David , Cipriano-Crespo Carmen , Mariano-Juárez Lorenzo
Published: June 2020

This chapter is a literary review based on the experience of patients with ambulatory oxygen therapy treatment that analysed the way in which this treatment influences patients from an occupational point of view. The relationship of these pathologies and treatments with mental health, especially with depression, anxiety, and stress, is also addressed, with an interest in the treatment of possible functional limitations from the intervention of the discipline of occupational therapy. Oxygen therapy allows patients to continue in their performance contexts, although it can generate new limitations and deficiencies derived from episodes of anxiety and mood disorders, causing greater occupational disfunction. A function-dysfunction process that can be approached from occupational therapy with the aim of minimizing the impact both physical and psychological, enhancing the autonomy and independence of these patients.
Person in Need of Airway Cleaning and Use of Mechanical Insufflator-Exsufflator
Authors: Costa Ana Daniela , Ferreira Rogério Ferrinho , Amorim Raquel Cruz , Vieira João Vitor
Published: June 2020

Clearing of the airways in patients undergoing invasive mechanical ventilation (IMV) or non-invasive mechanical ventilation (NIMV) is a fundamental intervention that should be performed regularly, not only to avoid accumulation of secretions, but also to prevent the accumulation of secretions. One of the most relevant interventions in this type of patients is the use of the mechanical insufflator-exsufflator (MI-E), commonly known as cough assist. On the other hand, respiratory functional reeducation (RFR) involves a set of non-invasive procedures that allow the secretion to be released. The efficacy of the RFR associated with the use of MI-E presents gains resulting from this conjugation, namely when the person does not cooperate, when he/she shows a decrease in muscle strength or fails to present an effective cough. The integrative review of the literature has made evident the gains that exist for the person in intensive care, using MI-E associated with airway clearance, ventilation performance, airway permeability, decreased complications, and rate mortality.
Acholi Without Roots
Authors: Odongoh Stevens Aguto
Published: June 2020

This chapter interrogates historical processes with war and displacement resulting from armed rebellion between the Lord's Resistance Army (LRA) and the government of Uganda between 1987-2007 that created contesting notions of being Acholi. The chapter shows how Acholi war trajectories experienced through taking refuge amongst other societies, conscription into warfare of mainly child abductees, and encampment divided the current Acholi into new imaginaries and solidarities. Lasting for over two decades, the LRA war led to the emergence of different cultures based on the different life pathways that Acholi took during violence and displacement: the culture of camps or IDPs (donation, food aid, governmental/humanitarian organizations' assistance) and the culture of war (forceful abduction of children and recruitment into rebel forces and militias).
Forgive but Not Forget
Authors: Abdrabo Amal Adel
Published: June 2020

Pierre Nora once said, “We speak so much of memory because there is so little of it left.” Does it mean that we need to document memory so not to lose the truth? What is the ‘T'ruth? And from which perspective? Based on the Lebanese case, could films be one of the mechanisms used to achieve transitional justice? The author of this chapter depends on both Pierre Nora's perception of sites and place of memory along with Maurice Halbwachs' theory on collective memory in order to understand whether documenting the traumatic events is considered as an applicable mechanism to achieve justice within countries that struggle to accomplish national reconciliation? The methodological approach relies on visual critical discourse analysis combining Paul Ricoeur's hermeneutic approach and Norman Fairclough's perception of dialectic of discourse.
Displacement and the Creation of In/Visible Boundaries
Authors: Casseus Clara Rachel Eybalin , Odongoh Stevens Aguto , Abdrabo Amal Adel
Published: June 2020

This concluding chapter discusses the reinforcement of the affective capacity building among dispersed transnational communities within the three cases presented earlier in this book. The first case explores how migrant organisations of Haitian origin engagement in Parisian banlieues is beneficial to their homeland's development. The second case is from the village of Jaziret Fadel that has the biggest gathering of Palestinian who fled to Egypt since the outbreak of 1948 war. It emphasizes the exploration of their new technique of 'killing memory' to gain acceptance, belonging and create a new sense of home within a new spatial context. The third case focuses on how the Northern Uganda war between the LRA and the Ugandan Army (1987-2007) has formulated the Acholi's experience with war, violence, and flight, which has led to different local constructions of place, political belonging, and material and emotional connections. Accordingly, will such communities be able to survive for a future on their own? Will memory to trace their genealogy fuel a sense of belonging after displacement? For what sort of citizenship within their new place?
Launching Diversity-Intelligent Strategies in Organizations
Authors: Hughes Claretha
Published: June 2020

The purpose of this chapter is to provide diversity intelligent strategies that can be used by leaders to eliminate ineffective diversity efforts, enhance effective diversity efforts, and provide new diversity intelligent strategies in organizations. Integrating DQ alongside emotional, cultural, and intellectual intelligences in the workplace can strengthen the effectiveness of leaders' people management efforts. Most employees enter organizations with the expectation of having positive experiences with their leaders and achieving success towards their career goals. Yet, many are marginalized or limited in their opportunities for advancement for reasons of which they have no control. The eradication of ineffective training and development of diversity must occur for effective change to occur. Credible DQ, ethical and legal issues, and workforce inter-personnel diversity training programs must be launched by HRD professionals and organization leaders so that leaders are developed to provide employees with fair and just treatment and successful career development will ensue.
Augmented Context-Based Conceptual User Modeling for Personalized Recommendation System in Online Social Networks
Authors: Alnahhas Ammar , Alkhatib Bassel
Published: June 2020

As the data on the online social networks is getting larger, it is important to build personalized recommendation systems that recommend suitable content to users, there has been much research in this field that uses conceptual representations of text to match user models with best content. This article presents a novel method to build a user model that depends on conceptual representation of text by using ConceptNet concepts that exceed the named entities to include the common-sense meaning of words and phrases. The model includes the contextual information of concepts as well, the authors also show a novel method to exploit the semantic relations of the knowledge base to extend user models, the experiment shows that the proposed model and associated recommendation algorithms outperform all previous methods as a detailed comparison shows in this article.
An Improved Firefly Algorithm-Based 2-D Image Thresholding for Brain Image Fusion
Authors: Srikanth M. V.  , Prasad V. V. K. D. V. , Prasad K. Satya
Published: June 2020

In this article, an attempt is made to diagnose brain diseases like neoplastic, cerebrovascular, Alzheimer's, and sarcomas by the effective fusion of two images. The two images are fused in three steps. Step 1. Segmentation: The images are segmented on the basis of optimal thresholding, the thresholds are optimized with an improved firefly algorithm (pFA) by assuming Renyi entropy as an objective function. Earlier, image thresholding was performed with a 1-D histogram, but it has been recently observed that a 2-D histogram-based thresholding is better. Step 2: the segmented features are extracted with the scale invariant feature transform (SIFT) algorithm. The SIFT algorithm is good in extracting the features even after image rotation and scaling. Step 3: The fusion rules are made on the basis of an interval type-2 fuzzy set (IT2FL), where uncertainty effects are minimized unlike type-1. The novelty of the proposed work is tested on different benchmark image fusion data sets and has proven better in all measuring parameters.
An QPSL Queuing Model for Load Balancing in Cloud Computing
Authors: Siddiqui Shadab , Darbari Manuj , Yagyasen Diwakar
Published: June 2020

Load balancing is the process of distributing a workload among various servers. Queuing is the most common scenario for day-to-day applications. Queuing theory is used to study the problem of waiting lines. Queuing theory bridges the gap between service demands and the delay in replies given to users. The proposed QPSL Queuing Model makes use of M/M/k queue with FIFO queue discipline for load balancing in cloud computing. The model makes use of exponential distribution for calculating service rates and Poisson distribution for calculating waiting lines. The proposed QPSL queuing model is also compared with other existing queuing models for load balancing on various parameters. The experimental analysis depicts that QPSL model performed better in terms of service rate and response time.
Simulation Experiment of Key Exchange Protocol in Mobile Devices With E-Commerce Application
Authors: Vyas Pranav , Trivedi Bhushan
Published: June 2020

In this article, the authors discuss their experiment of simulating a proposed key exchange protocol by implementing it in a sample e-commerce application on a mobile device. The article compares its performance with other protocols. The authors also implemented similar industry standard key exchange protocols among other similar protocols proposed by other researchers for comparison. The authors consider different parameters such as number of operations required for key exchange, key exchange time and battery usage. The authors also consider different network bandwidth and mobile devices in their experiment.
Applications, Methodologies, and Technologies for Linked Open Data
Authors: Avila-Garzon Cecilia
Published: June 2020

Advances in semantic web technologies have rocketed the volume of linked data published on the web. In this regard, linked open data (LOD) has long been a topic of great interest in a wide range of fields (e.g. open government, business, culture, education, etc.). This article reports the results of a systematic literature review on LOD. 250 articles were reviewed for providing a general overview of the current applications, technologies, and methodologies for LOD. The main findings include: i) most of the studies conducted so far focus on the use of semantic web technologies and tools applied to contexts such as biology, social sciences, libraries, research, and education; ii) there is a lack of research with regard to a standardized methodology for managing LOD; and iii) a plenty of tools can be used for managing LOD, but most of them lack of user-friendly interfaces for querying datasets.
Turning Around Colleges of Education
Authors: Ruch Charles P.
Published: June 2020

The last decade has produced an unprecedented number of stakeholders calling for demonstrated improvement in the preparation of educational personnel. These pressures directly challenge the way teachers are prepared and the unit responsible for that work—Colleges of Education. Failure to identify needed changes and respond can result in the unit facing a crisis. The following study outlines comprehensive changes needed to accommodate to the ‘New Normal' of the teacher education enterprise, illuminates a change strategy to turnaround a unit in crisis, and reports two case studies where a College of Education responded to needed changes. Lessons from these two case studies served as a basis for a turnaround model useful to other institutions.
Learning How to Learn
Authors: Padhi Lili Kumari , Mishra Deepanjali
Published: June 2020

This article describes how every learner is a unique creative individual responsible for paving his/her own way of learning in a preclusion of external restraints. Learners apply a bunch of idiosyncratic means to segue the information into knowledge. The various implications of such manipulated formulation by the learners implies strategic responses to new information and indicates a rational commitment to learn in many different ways. Pertaining to this we have also different versions of learning styles and strategies and their categories. The growing innovative and multiple dynamic ways of learning here bring diffidence to the existence of those stipulated types of learning styles and strategic traditions. This article makes an attempt to synthesize the different types of ways of learning; the self- determined learning strategies along with the prevailing theories of learning styles hypothesis.
Burr Formation in Casting Using Vertical-Type High-Speed Twin-Roll Caster
Authors: Haga Toshio , Yamashiki Takuya , Watari Hisaki , Nishida Shinichi
Published: June 2020

The mechanism and region of burr formation in casting using a vertical-type high-speed twin-roll caster were investigated using a side-dam plate with a window. A383, an aluminum alloy typically used for casting due to its excellent fluidity at semisolid condition was used. The solid fraction of the semisolid metal ejected from the window was low. When solid metal was ejected from the window, no burr formed. The results suggest that a burr formed when the semisolid metal was ejected in gap between the side-dam plate and the side surface of a roll. The semisolid metal was ejected near the point where the semisolid metal on the two rolls met.
Investigation on Effect of Varying Weight Percentage of Glass Fiber and Filler on the Properties of Glass Fiber-Cement- Polyester Composites
Authors: Shettigar Phaneesh , Shettar Manjunath , Sathish Rao U. , Kowshik C.S. Suhas , Gowrishankar M.C.
Published: June 2020

In this research, the results of different weight percentage of glass fiber (30, 40 & 50), cement (0, 3 & 6) and polyester resin (70, 60 & 50), on the properties of glass fiber-cement-polyester composites are investigated. The specimens are prepared by hand lay-up technique. All the specimens are tested for tensile and flexural strength as per ASTM standards. Results showed that escalation in glass fiber wt.% improved the tensile strength (by 9% at 40 wt.% and 17% at 50 wt.%) and flexural strength (by 10% at 40 wt.% and 16.5% at 50 wt.%). Whereas an increase in cement weight percentage decreases tensile strength and increases flexural strength. The failure of the sample is due to glass fiber pull out and rupture of the matrix, under tensile load.
Numerical Investigation on the CFRP Strengthened Steel Frame under Earthquake
Authors: Tafsirojjaman T. , Fawzia Sabrina , Thambiratnam David
Published: June 2020

Steel structures are commonly used in seismic regions of the world because of its strength and ductility. However, these structures are still prone to damage during an earthquake. With this risk of seismic damage, the strengthening of steel structures is a major concern in order to resist the dynamic loads resulted from earthquakes. This report investigates the potential for the use of Carbon Fibre Reinforced Polymer (CFRP) to strengthen the rigid steel frame under a real earthquake load. This research will be undertaken using Strand7, a finite element (FE) analysis software. To validate the accuracy of this research, the finite analysis results have been compared to the available experimental study by the Authors. First, both FE models of a five-story bare steel frame and CFRP strengthened steel frame has been developed. Then the predicted numerical results of bare steel frame and CFRP strengthened steel frame under earthquake excitation are compared. The results indicated an increase in the seismic performance of the steel structure due to the strengthened with CFRP. The CFRP strengthened steel frame showed 15% less tip deflection compared to bare steel frame. Further analysis on the strengthening capabilities of higher thickness CFRP was performed to assess the effect of the thickness of CFRP and the higher thickness CFRP showed better seismic performance compare to normal thickness CFRP by reducing 34.38% of tip deflection.
Design of Nutrient Enriched Cement Paste with a Superabsorbent Polymer for the Bio-Based Self-Healing Concrete Development
Authors: Schreiberova Hana , Fladr Josef , Šeps Karel , Kohoutková Alena
Published: June 2020

The application of self-healing concrete for durability enhancement has become a widely studied topic in recent decades. This paper focuses on addition of a superabsorbent polymer (SAP) to bio-based self-healing concrete – a material in which cracks are autonomously sealed by incorporated microorganisms. As previously proposed, the SAP could serve as protection of the microorganisms against the harsh concrete environment and possibly to further enhance the materials autogenous sealing capacity. However, determining the applicable bio-based concrete mix design is not without obstacles as the immense absorption capacity of the SAP is, inter alia, closely related to ions present in the solution. This current study compares different mix designs of cement paste with the nutrients applied in the bio-based concrete and the addition of the SAP in dry and partially saturated states. The paste consistencies are determined, and a number of cement paste specimens is prepared to measure flexural and compressive strengths at 7 and 28 days from casting. The flowability results indicate that the SAP in a dry state absorbs slightly less than 25 g/g SAP of extra mixing water as the final consistency was similar to the reference paste. Further, the results showed that the partially saturated SAP is able to retain a great amount of the liquid throughout the mixing process. In this study, the strengths generally drop by still admissible 20% in the case of the dry SAP and extra water addition, whereas the replacement of mixing water by the partially saturated SAP results in a significant strength increase. These findings indicate that the dosage 0.5% SAP by cement weight in both of the states, dry and saturated, is applicable in the nutrient enriched cement paste from the mechanical perspective, although further work which would describe the absorption and retention mechanisms in depth is needed.
The Effect of the Presence of GdVO3 and GdVO4 in the Conversion of Propane
Authors: Markova Ekaterina Borisovna , Lyadov A.S. , Kurilkin V.V. , Cherednichenko A.G. , Serov J.M. , Sheshko T.F.
Published: June 2020

The GdVO3 and GdVO4 catalyst has been prepared via solid-phase synthesis. It has been shown by a complex of physical and chemical methods that or GdVO3, the main one is the phase with the structure of the first homologue of the Roldlesden-Popper series of a rhombical distorted perovskite. Orthovanadate of GdVO4 crystallize in the structural type of zircon. The catalytic properties of GdVO3 and GdVO4 are studied in the propane cracking process to form propylene and ethylene. It was found that GdVO3 and GdVO4 has a high selectivity and catalytic properties. It was shown that propane conversion started at 773 K, was only 2% at 873 K, and raising the temperature to 923 K increased propane conversion to 21%. In the presence of GdVO4 and GdVO3, a considerable increase in propane conversion was observed that reached 60% at 923 K. The structure of the catalyst is stable under the conditions of preferential C3H8 reduction. Deactivation was much faster with GdVO3, and it was observed after 20 h of operation at a rate that was slightly slower than the one for GdVO4.
Failure Analysis of Composite Structures Using Multiscale Technique
Authors: Kwon Young W.
Published: June 2020

Failure analyses of laminated fibrous composite structures were conducted using the failure criteria based on a multiscale approach. The failure criteria used the stresses and strains in the fiber and matrix materials, respectively, rather than those smeared values at the lamina level. The failure modes and their respective failure criteria consist of fiber failure, matrix failure and their interface failure explicitly. In order to determine the stresses and strains at the constituent material level (i.e. fiber and matrix materials), analytical expressions were derived using a unit-cell model. This model was used for the multiscale approach for both upscaling and downscaling processes. The failure criteria are applicable to both quasi-static loading as well as dynamic loading with strain rate effects.
Membrane Structures with Half-Costa Surface in YZ-Plane
Authors: Yee Hooi Min , Nurul Afiqah Abdul Malek
Published: June 2020

This paper presents the computational form-finding analysis of half-Costa tensioned membrane structure model in YZ-plane with different boundaries. The computational form-finding analysis is carried out based on nonlinear analysis method. The tensioned membrane structure in the form of half-Costa models in YZ-plane with different geometry have been found to converge with least square error of total warp and fill stress deviation. The outcome of this paper can serve as a reference in selecting satisfactory parameters to allow the performance increase of tensioned membrane structure in the form of half-Costa in YZ-plane respected to their boundary condition. These models will be selective forms of tensioned membrane structure for design engineers and architect to ponder on as it is a resource efficient structure hence preventing further damage to the environment.
Tensile Fractography of Artificially Aged Al6061-SiC+B4C Hybrid Composites
Authors: Sharma Sathyashankara , Gowrishankar M.C. , Hiremath Pavan , Shettar Manjunath , Gurumurthy B.M.
Published: June 2020

In the current work Al6061 hybrid composites reinforced with Silicon Carbide (SiC) and Boron Carbide (B4C) were studied for improvement in hardness and behavior of fracture surface after artificial aging. It was found that after aging at 100 and 200 OC, presence of SiC and B4C particles in the Hybrid Al6061 Matrix Composites showed substantial improvement in hardness compared to that of the base alloy. Behavior of fracture mechanism after tensile strength have been discussed to conclude the factors which impact the mechanism of crack growth. Presence of SiC and B4C reinforcement particulates and artificially aged at 100°C for Al6061-SiC+ B4C hybrid metal matrix composite shows enhancement in hardness by 180% and tensile strength by 80% due to the presence of finer secondary solute rich intermetallic phases of alloying elements. Fractography analysis displays particle interface failure and combination of brittle and ductile mode of failure.
Influence of the Developed Flame Retardant System Based on Renewable Raw Materials on Epoxy Resin Fire Behavior
Authors: Salasinska Kamila , Celiński Maciej , Kozikowski Paweł , Leszczyński Michał K. , Borucka Monika , Gajek Agnieszka
Published: June 2020

A novel intumescent flame retardant system based on shell (S) and histidine diphosphate (HF) was developed and introduced into the epoxy resin in order to verify its effectiveness in the inhibition of the burning process. To confirm the structure of HF, powder X-ray diffraction (XRD) was used. The influence of the flame retardant system on the burning and smoke emission of the resin was assessed based on cone calorimeter (CC) measurements. Moreover, structural evaluation of polymeric materials was carried out using scanning electron microscopy (SEM). It was found that the incorporation of the developed flame retardant system caused the formation of a protective layer in the form of char, which reduced burning process and smoke emission of the epoxy resin. The obtained results were better than those generated by commercial intumescent fire retardant.
Characterization of a Composite Material Consisting of a Polyester Resin Matrix with Reinforcement of Horsemane in Flat Tissue
Authors: Bautista Christian G , Mena Patricio I. , Paredes Cristian A. , Paredes Marco Antonio
Published: June 2020

The manufacture of mechanical components by means of biodegradable composites is the best alternative at the moment of reducing cost and weight, maintaining the mechanical characteristics. In this work the mechanical characteristics are shown as the result of combining a polyester matrix resin with a reinforcement of animal fiber such as horsehair. The results obtained correspond to mechanical characterization tests at traction, bending and impact by dart drop according to rules ASTM D3039/D3039M-17, D7264/D7264M-15 and D5628 respectively, made in four groups of test pieces of material combining a polyester matrix resin and reinforcement of horsemane. The development of materials composed of horsehair as reinforcements offers similar mechanical characteristics with traditional materials such as sheet steel or polymers, but with a considerable weight reduction, ideal for automotive applications such as bodywork or interior parts of vehicles.
Surface Morphology Studies on Laser Irradiated Target and Bi(Pb)SrCaCuO Thin Films
Authors: Jannah A.N. , Halim S.A. , Abdullah H.
Published: June 2020

In this study, pulsed laser deposition technique was used to deposit bismuth plumbum strontium calcium copper oxide {Bi (Pb)SrCaCu0} thin films on MgO single crystal substrate. Solid state procedure which is inexpensive technique used in the production process of the Bi (Pb)SrCaCu0 superconductor bulk sample. In this work, Handy YAG Lasers (model: HYL 101 E) has been used. It is a high power class 4 solid state (ND: YAG) Q-switched pulsed laser and 532 nm (visible green: second harmonic) has been used to ablate the films. The substrate used in this work was single crystal MgO with the (100) orientation. Scanning Electron Microscopy (SEM) was used to observe the microstructure of fracture surface and cross section of thin film materials. Variable Pressure Scanning Electron Microscope (LEO-VPSEM) was used to study the correlation between the microstructure features. SEM studies have shown that the surface morphology of the bulk sample comprises platelets of average size ≈10μm with uniform and homogenous microstructure. The typical morphology of the as deposited films showed a continuous phase, granular structure, which spherical particles up to 5μm in diameter. The most prominent types of particulates BPSCCO films on MgO substrate are droplets with smooth surface, bigger droplets with granular surface, spherically-shaped features confined by randomly oriented facets, submicron rod-like features, Cu-enriched needles, platelets, irregularly-shaped Cu-rich outgrowths, strongly Cu-enriched tabular outgrowths, big target fragments, island growth structure, cubic and rectangular cubic structures. SEM analysis also showed that the deposition time have a pronounced influence on the particle size. The target morphology, which develops under laser-irradiation, depends on the laser fluence and the technique, by which the laser beam is moved relatively to the target during ablation. Laser-irradiated surfaces normally become altered both physically and chemically and morphological changes take the form of periodic structures such as ripples and ridges.
Post Solutionising Rolling Sway on the Precipitation Behaviour of Eutectoid Steel Powder Reinforced Al7075 Ternary Alloy Composites
Authors: Bhat Rajesh , Sharma Sathyashankara , Gowrishankar M.C. , Shettar Manjunath , Hiremath Pavan , Hegde Anand
Published: June 2020

The solitary distinguished thermal treatment to aluminium alloy matrix of nonferrous group with uniformly dispersed reinforcement particles is precipitation or age hardening with or without mechanical working. Al7075 ternary alloy composites belongs to Al-Zn-Mg group and bulk properties can be enhanced by the formation of the immensely small consistently spread out precipitates of solute rich second phase within the matrix phase. The treatment comprises solutionising (550°C) supported by controlled aging (100 and 180°C) below the solvus temperature of the given alloy. Aging expedites the diffusion of solute atoms to form secondary particles (intermetallics) from the room temperature super saturated solid solution. This process is supported by deformation known as rolling as post activity, develops strain hardening in matrix and reinforcement. The present work shows the distinction in the aging phenomenon on alloy and alloy matrix composites (reinforced with 3 and 6 wt% of eutectoid steel powder, 10-30 micron size) upon undergoing cold rolling prior to aging i.e., after solution treatment. The variation in the hardness distribution with aging kinetics for both aging temperatures with and without cold deformation (10 and 20%) in between the consecutive stages like, solution treatment and aging were investigated and peak hardness values were noted in each aging temperatures and results were analysed. In every hardness test 10 trials were performed and the average of 6 consistent readings are taken as the outcome. 20 to 40% improvement in peak hardness is observed with intentional deformation over without deformation. The composite may be used for light duty cold working dies where bulk hardness and frictional characteristics are very important.
Acute spontaneous cervical spinal epidural haematoma a very rare presentation mimicking of carotid dissection during sleep
Authors: Jaweed Mohammad , Ganesan D , Yasin Mohammad , Liew Boon , Bin Rosman Azmin
Published: June 2020

Acute spontaneous spinal epidural hematoma without any identified etiology is a rare phenomenon and an uncommon cause of acute spinal cord compression. We report a case of acute spontaneous cervical spinal epidural hematoma, with sudden onset of acute neck pain and left-side body weakness during sleep which resembling of cervicle carotid dissection. The pain commenced suddenly, early in the morning while the patient was asleep. He had no previous history of any relevant medical disorder. Cervical Spine MRI revealed a cervical epidural haematoma at C3/C4, mainly on the left side, with spinal cord compression. Therefore, an emergent C3/C6 hemilaminectomy and evacuation of hematoma were carried out within 24 h of presentation. The patient's neck pain resolved after surgery and he was able to walk, though he required bladder catheterization on discharge after 1 week. He has nearly intact motor neurological examination in the second month of the operation.