bluuebunny/crossref_metadata_2025 huggingface dataset:
Adverb placement in EFL academic writing
Authors: Larsson Tove , Callies Marcus , Hasselgård Hilde , Laso Natalia Judith , van Vuuren Sanne , Verdaguer Isabel , Paquot Magali
Published: May 2020

The present study looks at adverb placement in expert writing and in first-language and second-language novice spoken and
written production. The extent to which first-language (L1) transfer is still present in advanced learners’ written production is also
investigated. The study uses data from one expert corpus (LOCRA), two native-speaker student
corpora (BAWE and LOCNEC) and two learner corpora (VESPA and LINDSEI). The results highlight the importance of taking mode into consideration, as clear distributional
differences were found between spoken and written production. In addition, while considerable differences could be noted across L1
background in the spoken data, factors such as presence/absence of auxiliary, verb type (e.g. intransitive, copular/linking) and lexis were
found to be most important for predicting adverb placement in the written data. Only very limited evidence of L1 transfer was found in the
learners’ writing, suggesting that advanced learners have largely mastered the distributional preferences of adverbs.
An interpreter advantage in executive functions?
Authors: Nour Soudabeh , Struys Esli , Woumans Evy , Hollebeke Ily , Stengers Hélène
Published: May 2020

The aim of this systematic literature review was to answer the question of which executive function is most
affected by interpreter training and experience. We used the ‘unity and diversity’ framework of executive functions to distinguish
between three executive components: Response and Distractor Inhibition, Shifting, and Updating.
Among the seventeen studies included in the review, we only found evidence for an interpreter advantage on
Shifting and Updating, but with a different pattern for each of these. With regard to
Updating, groups of interpreters scored better than comparison groups, but general trend in longitudinal
studies did not show an improvement for interpreter trainees. In contrast, for Shifting, scores improved as a
result of interpreting training. Our systematic review stresses the importance of understanding the diversity of executive
processes when investigating the relationship between interpreting and cognitive performance.
Onchocerciasis: status and progress towards elimination
Authors: Hopkins Adrian D.
Published: May 2020

Craw craw was first described almost 150 years ago. Since then considerable progress has been made in understanding the
Onchocerca volvulus
life cycle, its effects on the host (blindness, skin disease and epilepsy) and potential control measures. Early attempts were aimed at controlling the black fly (
Simulium
) that transmits the disease. This included the early use of DDT in some isolated foci in East Africa. This was followed in the 1970s by the Onchocerciasis Control Programme (OCP) of West Africa using other safer insecticides. In 1987, MSD (known as Merck & Co Inc. in the USA and Canada) announced the donation of Mectizan
®
(ivermectin MSD) as long as was necessary for onchocerciasis control. This began a new chapter in the control of the disease including the creation of the African Programme for Onchocerciasis Control (APOC) and the Onchocerciasis Elimination Programme for the Americas (OEPA). In the Americas, four countries have now been verified free of transmission of the disease by the World Health Organisation. In Africa where foci are considerably larger, APOC with its partners has succeeded in developing a control programme covering virtually all areas where the prevalence of the disease can cause serious effects. In some disease foci in Africa, elimination of transmission has been achieved. Following surveys on the Mali Senegal border, there was a move in 2009 to change the paradigm from control to elimination. Development has been slow but by 2030, there is hope that most countries will have stopped treatment and others will have completed post-treatment surveillance surveys although some foci in conflict areas will remain.
Alternatives to synthetic pesticides for the management of the banana borer weevil (
Cosmopolites sordidus
) (Coleoptera: Curculioniidae)
Authors: Okolle N.J. , Ngosong C. , Nanganoa L.T. , Dopgima L.L.
Published: May 2020

Bananas and plantains are important staple crops for many people in developing countries, but these crops are severely affected by biotic constraints that reduce productivity. A major biotic stress is the banana corm borer weevil (
C. sordidus
) whose larvae eat corm/pseudostem tissues that eventually weaken the plants and cause toppling. To manage these borer weevils, most farmers use synthetic pesticides with active ingredients from different pesticide groups. Over reliance and abusive use of pesticides result in detrimental effects on the environment and human health. These effects together with ecological backlashes such as development of resistance by the pest have led to numerous advocacies to minimize the use of these chemicals. To achieve this, there has been increasing number of researches to seek sustainable alternatives that could be used to replace these synthetic pesticides or be integrated with less toxic chemicals to effectively manage the pest. This review summarizes global research on the use of synthetic pesticides and alternative management techniques such as the use of appropriate cultural practices (e.g., clean planting materials, fallowing, mulching, intercropping, and trapping), botanical pesticides (e.g., from Solanaceae, Asteraceae, and Meliaceae), entomopathogens, predators/parasitoids, and the use of resistant crop varieties, as well as possibilities of engineering phytocystatins to produce transgenic varieties that will be harmful to weevil. The review ends with conclusions, limitations/gaps, and recommendations for future research for the different alternative options.
Chitinase system of Aeromonas salmonicida, and characterization of enzymes involved in chitin degradation
Authors: Pentekhina Iuliia , Hattori Tatsuyuki , Tran Dinh Minh , Shima Mizuki , Watanabe Takeshi , Sugimoto Hayuki , Suzuki Kazushi
Published: May 2020

The genes encoding chitin-degrading enzymes in Aeromonas salmonicida SWSY-1.411 were identified and cloned in Escherichia coli. The strain contained two glycoside hydrolase (GH) families 18 chitinases: AsChiA and AsChiB, two GH19 chitinases: AsChiC and AsChiD, and an auxiliary activities family 10 protein, lytic polysaccharide monooxygenase: AsLPMO10A. These enzymes were successfully expressed in E. coli and purified. AsChiB had the highest hydrolytic activity against insoluble chitin. AsChiD had the highest activity against water-soluble chitin. The peroxygenase activity of AsLPMO10A was lower compared to SmLPMO10A from Serratia marcescens. Synergism on powdered chitin degradation was observed when AsChiA and AsLPMO10A were combined with other chitinases of this strain. More than twice the increase of the synergistic effect was observed when powdered chitin was treated by a combination of AsLPMO10A with all chitinases. GH19 chitinases suppressed the hyphal growth of Trichoderma reesei.
Hizikia fusiforme extract enhances dendritic cell maturation in vitro and in vivo
Authors: Kim Mi Eun , Cho Jun Hwi , Jung Inae , Kim Hyung Keun , Lee Jun Sik
Published: May 2020

Dendritic cells (DCs) are play critical roles in the priming and regulation of immune responses. DCs rapidly process and convey these antigens to prime antigen-specific T cells. Therefore, regulation of DCs functions is important for immunity and immunotherapies. Immune adjuvants for DCs activation are needed to improve the efficacy of vaccines against tumors and many infectious diseases. Therefore, we demonstrate that H. fusiformis extract can regulate DCs maturation and activation. H. fusiformis extract induced costimulatory molecules (CD 80 and CD86), antigen-presenting molecules (major histocompatibility complex (MHC) I and II), CCR7 expression, and interleukin (IL)-12 production in DCs. These effects are associated with upregulation of mitogen-activated protein kinase (MAPK) signaling pathway. In addition, H. fusiformis extract induces costimulatory molecules on splenic DCs and activated CD8+ T cells in vivo. Taken together, these findings suggest that H. fusiformis extract may be a potential efficient immune therapeutic compound in DCs-mediated immunotherapies.

Abbreviations

CTL: cytotoxic T lymphocytes; DCs: dendritic cells; ERK: extracellular signal-regulated kinases; IL: interleukini; JNK: c-Jun N-terminal kinase; MAPK: mitogen-activated protein kinase; MHC: major histocompatibility complex
Evaluation of a 3D printed OSL eye lens dosimeter for photon dosimetry
Authors: Santos M F , Filho W C V , Melo G T P , Asfora V K , Khoury H J , Barros V S M
Published: May 2020

This work demonstrates the use of high-resolution 3D printing to fine-tune the low energy dependence of an eye lens dosimeter holder associated to a BeO OSL detector element (ezClip). Five geometries of the denominated iBe dosimeter were developed, three with a variation in the thickness of the wall in front of the sensitive element that tailor the response at low radiation energies; and three with variations of width and curvature in order to vary the angular response of the dosimeter badges. Additive manufacturing was accomplished using stereolithography which gave a high degree of accuracy and precision. The optimised dosimeter badges showed a low energy and angular dependence, within −20% to +20% in the energy range of 24 keV to 662 keV and from 0 to 60° incidence; and within −10% to +10% in the energy range of 24 keV to 164 keV and from 0 to 60° incidence. In contrast to other dosimeters with higher effective atomic numbers, the use of BeO as the sensitive element resulted in a flat energy and angular dependence response at low energies. A significant reduction in the measurement uncertainty in the diagnostic radiology energy range was achieved.
Conventional vs Microwave assisted SiO2/P2O5 catalyzed synthesis of Schiff bases
Authors: Mishra N , Yadav R , Kumar K , Pandey H , Pandey R
Published: May 2020

Here in this work we have carried out synthesis of isoniazid and their benzaldehyde derivative in the presence of SiO2/P2O5 catalyzed utilizing conventional and microwave assisted protocols. Both these protocols examined comparatively and we found that microwave assisted synthesis is more efficient, eco-friendly and economical method as compared to conventional method. Yield of product is also higher than conventional method. Use of heterogeneous catalyst is also promoting the yield of product and it is very easy to separate from the product by simple filtration and centrifugation. These synthesized compounds are characterized by physical and spectral studies (IR, UV-VIS, NMR spectroscopy) Isoniazid having excellent antitubercular activity and due to presence of Isoniazid they may have good antibiotic property.
Mathematical modeling and analysis with various parameters, for infection dynamics of Tuberculosis
Authors: Rana P S , Sharma N
Published: May 2020

Mathematical model is needed to study the epidemiology of tuberculosis. Here we have proposed a model that is more realistic. We are exhibiting a theoretical framework for getting the control and eradication methodologies to minimize the number of infectious tuberculosis cases in the community. For this purpose, the model population has been compartmentalized and the consequential model equations have been solved analytically. Numerical Simulation has been given to validate the results obtained by the theoretical approach. The effect of latent periods on the epidemics of tuberculosis with respect to population density has been studied. The equilibrium points of the model are calculated and their stability is established by using the ‘Basic Reproduction number’. It is observed that when basic reproduction number is less or equal to unity, the disease-free equilibrium point (DEF) is globally asymptotically stable, while when it is greater to unity, the endemic equilibrium point (EE) is globally asymptotically stable i.e., illness will persist in the population and epidemic will turn out to be endemic. Also, it is obtained that compactness of people decides the infection rate of tuberculosis i.e. the risk of instability of disease free equilibrium increases as the population density increases.
Adsorption study of Heavy Metals from Aqueous Solutions using Magnetite Nanoparticles
Authors: Anamika  , Singh Virendra , Yadav Basant K
Published: May 2020

Contamination of heavy metals in wastewater is a significant worldwide problem, which is causing to detrimental effect on human health and environment. In present work, magnetite nanoparticles were used for the expulsion of Pb(II) and Cd(II) ions from aqueous solutions at varying pH conditions, contact time and adsorbent amounts. Magnetite nanoparticles were synthesized by co-precipitation method. Synthesized nanoparticles were characterized by XRD, FTIR, UV-Vis, VSM and SEM techniques for structural, optical, magnetic and morphological properties. The crystalline nature of magnetite nanoparticles with crystallite size 10.16 nm was confirmed by XRD. Optical properties and functional group identification of magnetite nanoparticles were revealed by UV-Vis and FTIR spectroscopy respectively. VSM measurements showed that the saturation magnetization of magnetite nanoparticles was 56.42 emu/g. This indicates that after adsorption, an easy separation of metal loaded magnetite nanoparticles from aqueous solutions can be achieved by applying the external magnetic field. Adsorption experiments results showed that the adsorption capacity of magnetite nanoparticles is higher for Pb(II) ions. At optimum conditions, the maximum removal efficiencies for Pb(II) and Cd(II) ions were 98.6% and 93% respectively. Langmuir and Freundlich adsorption isotherms were found suitable for adsorption processes. The adsorption kinetic data for both the metal ions were best fitted by pseudo second order reaction. Surface images of bare and metal loaded magnetite nanoparticles supported the confirmation of adsorption of metal ions on nanoparticles surface. Thus, it is concluded that magnetite nanoparticles can be effectively used as an adsorbent for expulsion of heavy metals from aqueous solutions.
A compatible standard policy measure to tackle solar photovoltaic waste in Indian scenario
Authors: Sheoran Manisha , Sharma Susheela , Kumar Pancham
Published: May 2020

Expeditious evolution of solar photovoltaic industry has triggered transformation in energy sector across the world. After the concluded durability of the PV panels amount of junk originates. This junk is directed into the category of solid waste. With the increasing solar power plant installations in India the amount of waste to be accumulated in the nearby years to come will be a matter of grave concern. Hasty action should be taken by the Indian policy makers and other non-governmental agencies to process the solar photovoltaic recycling policies at commercial level in an economically sustainable manner. This paper inspects the prospective requisite of PV reprocessing legislation by investigating the current reprocessing arrangements of the commercialized first and second generation solar PV materials. Emphasis is also laid on the hazardous effects of the waste on human body. Quantity of reclaimed material is considered and its economic importance is analysed. Architectural liability is put at the utmost front for curbing out the havoc to be created by piling up of the junk photovoltaic materials through economically feasible policy framework. Through this article effective solar PV reclaiming policy framework is proposed for the Indian government which will foster new socio-economic, environmental and employment opportunities.
Electronic properties of lithium tantalate using Compton spectroscopy
Authors: Joshi Pooja K , Arora G , Mali D , Jangid P K , Kumar K , Ahuja B L
Published: May 2020

We have measured the electron momentum density (EMD) of LiTaO3 using 100 mCi 241Am Compton spectrometer. The experimental Compton profile (CP) is compared with theoretical EMDs deduced using linear combination of atomic orbitals (LCAO) method with different exchange and correlation potentials namely PBE, PWGGA and VBH. On the basis of χ2 fit (which scales goodness of fitting) and difference profiles between experimental and theoretical CPs, LCAO-PWGGA potential based CP is found close to experimental results. Electronic properties like energy bands and density of states of LiTaO3 using LCAO-PWGGA potential show a band gap of 4.85 eV of LiTaO3, thereby depicting its semiconductor nature with wide band gap. It is observed that upper valence band region is mainly dominated by 2p states of O and 5d states of Ta, although there is small contribution of 2s states of Li in this region.
First principles calculations to probe electronic response of lithium tetraborate
Authors: Jangid Pawan K , Arora Gunjan , Mali Deepika , Joshi P K , Kumar Kishor , Ahuja B L
Published: May 2020

Electronic structure of thermoluminescent (TL) lithium tetraborate (Li2B4O7) using density functional theory is presented. We have computed the E-k relations and density of states (DOS) by applying ab-initio LCAO and FP-LAPW theories. The band gaps obtained using local density approximation (LDA) within LCAO and FP-LAPW approaches are found to be 6.48 and 5.84 eV, respectively at Γ point of BZ leading to its direct band gap character. Our LCAO based computations give close agreement with experimental value of 7.9 eV. The DOS curves validate the dominance of O-2p states in the top valence band with a minor role of B-2p electrons. The conduction band region consists of dominant contribution of B-2p states.
A recursive pattern recognition approach to selection web services in cloud environment
Authors: Adarme M A , Jimeno M A , Puerto E G
Published: May 2020

There are optimization problems in the Cloud for the selection of web services, due to the large number of services available by different cloud providers and the diversity of quality of service parameters of each of them. This work proposes the adaptation of a pattern recognition model based on the systematic functioning of the brain called Ar2p for the selection of web services in composition activities in Cloud environments. The web serice are represented as patterns to be recognized by Ar2p, which determines the necessary and sufficient web services that constitute the composition of services that meet its functional and non-functional requirements. The services composition and activity selection have been formalized through a logical-mathematical model of web service recognition mechanisms in two steps, one that describes the syntactic search of the service and the second, which offers filtering through quality of service parameters. An adaptive implementation of the final model allows its recognition modules to be provided with any desired optimization strategy.
Design of a hybrid transmission system using wavelength division multiplexing and subcarrier under the frequency frame for 5G
Authors: Cuesta-Quintero F R , Puerto-Leguizamón G , Rico-Bautista D W , Cuesta-Quintero B , Coronel-Rojas L A
Published: May 2020

This article proposes the design of a hybrid transmission system using wavelength division multiplexing and subcarrier under the frequency frame for 5G. The proposal is evaluated through modeling based on simulation of the generation of optical carriers using a broadband source in combination with an optical filter configured with different pass bands and transmission at different distances. The simulation model evaluated the signal quality levels in terms of the Q factor, taking into account the frequency framework for 5G (5 GHz, 30 GHz and 60 GHz) and the optical fiber length (5 km, 10 km, 15 km, 20 km, 25 km, 30 km). The results obtained show that the best performance of the Q factor compared to distances was that of the 30 GHz frequency, both in the access network and in the metro network. It was also possible to demonstrate that through a broadband light source and a waveguide grating array it is possible to obtain optical carriers for the transmission of signals in a hybrid wavelength division multiplexing and subcarrier transmission system.
Double Twin Domination Number Of Peculiar Graphs
Authors: Mahadeven G. , Anuthiya S.
Published: May 2020

G. Mahadevan, et, al., introduced the concept of Double Twin Domination number of a graph. DTwin (u, v) is sum of number of a u − v paths of length less than or equal to four. The total number of vertices that dominates every pair of vertices

SDTwin
(
G
)
=
∑
D
T
w
i
n
(
u
,
v
)

for

u
,
v
∈
V
(
G
)

The double twin domination number of G is defined as

D
T
D
(
G
)
=

S
D
T
w
i
n
(
G
)

(

n

2

)

. In this paper we explore this parameter for Pan, Helm, Triangular Snake, related graphs.
η-Ricci soliton on f-Kenmotsu manifolds.
Authors: Shivaprasanna G S , Haque Md. Samiul , Somashekhara G
Published: May 2020

The objective of the paper is to studyη-Ricci soliton on an Einstein like Ricci tensor in f-Kenmotsu manifold. Further we have study curvature tensor R satisfying generalised recurrent,R(U1,U2).Mp=0 andMp(ς,U1).S=0.
Bifurcation and Chaos Control for Prey Predator Model with Step Size in Discrete Time
Authors: George Maria Selvam A , Britto Jacob S , Dhineshbabu R
Published: May 2020

The Lotka – Volterra systems served as a basis for the development and analysis of more realistic mathematical models of nonlinear interactions. A new form of discrete time 2-D prey predator model involving Lesile - Gower functional response with step size is proposed for discussion. Utilizing Euler scheme, discrete system is obtained from the continuous dynamical system. Dynamical consistency of the model which includes the existence and stability of the fixed points is investigated. Eigenvalues of Jacobian matrix are computed for corresponding fixed points. Analytical results illustrate rich dynamics and complexity of the model. The bifurcation theory is employed to study the existence of flip and Neimark-Sacker bifurcations. The chaos control of the discrete system is performed and numerical simulations are provided supporting the results.
Application of artificial neural networks to solution of variational problems in hydrodynamics
Authors: Kornaeva E , Kornaev A , Egorov S
Published: May 2020

The paper deals with a combined approach to approximation of velocity fields and minimization the objective functional in solving viscous fluids flow problems. The mathematical formulation of the problem is presented in the form of a generalized Lagrange functional. The flow function is designed using a feed forward artificial neural network with one hidden layer and with logistic activation function. The boundary values of the flow function are determined using the fluid flow rate. Thus, the problem of determination the velocity field is reduced to the problem of finding the network weights by minimizing the generalized Lagrange functional.
Dual-contoured model of cardiovascular system regulation
Authors: Korobov A A , Frolov S V , Aliyev N E , Rodionova I E
Published: May 2020

The purpose of the study is to create a model of the cardiovascular system that gives an adequate description of the processes of hemodynamic regulation for the needs of intensive care. An overview of the most recent significant blood circulation models that take the regulation processes into account is proposed, the peculiarities and limitations of such models are identified. The methods of computational hemodynamics and mathematical modeling are used. A zero-dimensional dynamic mathematical model of cardiovascular system with two regulatory contours suggested by its authors is described. The results of the study are of interest to intensive care doctors in selecting a treatment strategy.
System of vestibular assessment using video-oculography and electroencephalography data
Authors: Neprokin A V , Gorbunov A V , Tugolukov E N , Dolgov E P
Published: May 2020

This paper presents a new system for combined analysis of video-oculography and electroencephalography data during vestibular testing. The experimental setup consists of electroencephalography amplifier using 9EEG system of electrode placement and a low-cost, head-mounted device for video-oculography. The developed system has simple implementation and provides the possibility of simultaneous analysis of the nystagmus and bioelectrical activity of the brain during positional maneuvers, that can be used for differential diagnosis of dizziness and epilepsy.
Modeling of vertical spindle head for machining center
Authors: Krol O , Sokolov V , Tsankov P
Published: May 2020

The design of the vertical spindle head, which is part of the modular technological equipment of horizontal drilling-milling and boring machining centers, is considered. Three-dimensional modeling of parts and assembly units of the spindle head has been performed in the environment of integrated CAD system KOMPAS-3D. The effectiveness of full-featured specialized applications in the design process of the structure main components in the KOMPAS environment is noted. Built-in “Shafts and mechanical transmissions” applications for creating a vertical spindle head model the design procedures in the shortest possible time are provide. An assessment of the forming spindle assembly dynamic functioning quality on which external loading acts, with probabilistic nature is made. The spectral analysis method is used to evaluate the dynamic characteristics of the structure under consideration.
Method for identification, stability analysis and the dynamics monitoring of sociotechnical clusters
Authors: Borisov V , Dli M , Zaenchkovsky A , Fedulov Ya
Published: May 2020

The problem arising in the study of sociotechnical clusters is revealed. This problem consists in the impossibility of using a standard approach for the identification and sociotechnical clusters analysis, which does not take into account the relationship of coordinated interaction between objects in such clusters, depending on their goals and objectives. The set of indicators for the identification and analysis of sociotechnical clusters is substantiated. These indicators are based on fuzzy relations of concerted interaction between objects in such clusters. The original method for identification, stability analysis and the dynamics monitoring of sociotechnical clusters is proposed. The proposed method, in contrast to the known ones, allows you to analyze: the changing of the sociotechnical clusters sizes; the sociotechnical cluster centre drift; the separation and merging of these clusters; the emergence and disappearance of sociotechnical clusters. Fuzzy cognitive approach is used for the first time: firstly, to justify and estimate a set of indicators for sociotechnical clusters; secondly, for the stability analysis of these sociotechnical clusters.
Information support of the measuring device for choosing a thermophysical experiment data processing algorithm
Authors: Dmitriev O S , Zhyvenkova A A , Dmitriev A O , Barsukov A A
Published: May 2020

This paper addresses the problem of constructing a subsystem of informational decision-making support for choosing the optimal method and algorithm for calculating the thermophysical properties of polymer composites, which allows minimizing the error in determining properties under given experimental conditions. The subsystem is based on a modified hierarchy analysis method. It is built on the alternative use of four algorithms for the calculation of thermophysical properties and is included as a module in the application software of an intelligent data-measuring device for studying the curing process of polymer composites. Using simulation modeling, an assessment of the possibility of using algorithms for calculating thermophysical properties under various combinations of experimental conditions was made. The structure, composition, principles of construction, purpose, capabilities and parameters of the main modules of the applied software of the data-measuring device are described.
Simulation of the thermophysical experiment with remote control to determine the quality properties of the object
Authors: Selivanova Z M , Kurenkov D S , Hoang T A
Published: May 2020

Simulation of the thermophysical experiment for determination of thermophysical properties of insulating materials using the impulse method in the influence of a linear heat source on the test material and mathematical model of the process of thermophysical measurement is fulfilled in MathCad software. As a result of the simulation the optimum operating parameters for thermophysical measurements are determined: optimum operating parameters and thermal pulse repetition time interval in minimum measurement error of coefficients of thermal conductivity and thermal diffusivity of materials. The structure of an intelligent information-measuring system of remote control is offered that realizes the structure of an intelligent information-measuring system of remote control using methods of artificial intelligence that let us increase the efficiency and accuracy of determining the thermophysical properties of insulating materials.
Data mining of students’ behavior in E-learning system
Authors: Gushchina O M , Ochepovsky A V
Published: May 2020

The article deals with educational data mining techniques aimed at increasing effectiveness of E-learning process as well as the idea of adaptive feedback, individual assessment and more personalized attention to student’s profile due to dynamic monitoring and tracking of students’ behavior in the E-learning system. The following techniques are identified: cluster analysis to determine the most popular time threshold for the task per session; analysis and visualization of data to highlight the main options that contribute to the effective completion of courses, and the most popular educational resources; V-fold cross-checking with the use of statistical processing aimed at students by their main indicators of activity to determine the correlation between high percentage of activity and academic performance. The proposed educational data mining techniques allow to assess student’s behavior in the E-learning system for understanding student’s interest in studying the learning materials and assessing the quality of educational content.
Validity of Mathematic Learning Teaching Administration on Realistic Mathematics Education Based Approach to Improve Problem Solving
Authors: Santoso B , Syarifuddin H
Published: May 2020

The purpose of this study is to produce a learning tools based on Realistic Mathematics Education that is valid, practical, and effective against the problem solving abilities of students in class VII. Learning Tools are developed Lesson Plan (LP) and Student Worksheets (SW). This research is a development research with Plomp model of the which consists of three stages items, namely preliminary research, development, and improvement. At the development stage, the learning tools design and evaluation is carried out through formative evaluations.
Convergence Analysis of Euler-Maruyama Method on Ornstein-Uhlenbeck Equation
Authors: Rahman E S , Subhan M , Maulana Heru
Published: May 2020

The Ornstein-Uhlenbeck stochastic differential equation is a one of the most applied equation in financial mathematics. To find the analytical solution of the equation is very difficult, so the numerical solution is the choice. One of the numerical method that can be used is Euler-Maruyama method. In this paper, we analyze the convergence of Euler-Maruyama method using Lipschitz condition and other concepts. The analysis shows that numerical solution of Ornstein-Uhlenbeck equation that resulted by Euler-Maruyama method has strong convergence to the exact solution.
Practicality of geometry learning set based on van hiele theory to increase students’ mathematical communication ability
Authors: Andila Y D , Musdi E
Published: May 2020

Geometry is one of the important subject in mathematics. One of the objectives of learning geometry is the students can gain confidence about their mathematical abilities and be able to communicate mathematically. However, in their practices students are still having difficulty understanding geometric material and students’ mathematical communication skills are also still low. Considering the importance of geometry learning, the students’ mathematical communication ability need to be improved to achieve geometry leaning goals. In this study, geometry learning devices were developed based on the Van Hiele Theory with the purpose to produce a product consisting of lesson plan and students worksheet to develop students’ mathematical communication ability. The development model used is Model Plomp. Based on the results obtained in small group stage, there is increase in students’ mathematical communication ability seen from the result of working the questions every meeting. Then, an analysis the questionnaire of students who obtained practical category. So that, it can be conclude that geometry learning sets based don Van Hiele Theory practical can be used to increase Students Mathematical Communication Ability in Class VII Junior High School.
Practicality of Learning Tools Based on Contextual Teaching and Learning Approach to Improve Mathematical Communication Skills for High School Students Grade VII
Authors: Putri Y U , Musdi E
Published: May 2020

This study aims to develop mathematics learning tools based on contextual teaching and learning approaches in the form of lesson plan and student worksheets for high school students grade VII. This research is a development research. Model used is Plomp model which consists of three stages, namely the initial investigation phase, the prototype development stage, and the assessment stage. This research is limited to the prototype development stage to see the practicality of learning devices that has been designed. Based on the test results of the practicality of learning tools through three assessment data, namely, the observation sheet data of the implementation of learning with an average of 89.38% - the category is very practical, the teacher questionnaire data with an average of 88% - the category is very practical, and the questionnaire data of students’ responses with an average of 86.93% - the category is very practical. The results shows that the mathematics learning tool based on contextual teaching and learning approach is valid and practical.
Design of Mathematics Learning Devices Based On Professional Competency On Video Audio Engineering Expert Programs
Authors: Kurniawan D , Armiati A , Fauzan A , Yerizon Y
Published: May 2020

Vocational students are prepared to work and have expertise in the vocational field, therefore learning in vocational schools should pay attention to the professional competencies of the students themselves. Learning mathematics in vocational schools in learning mathematics does not relate the relationship of mathematics to the subject matter so that made students bored in learning mathematics and think mathematics is a difficult, unattractive and less useful lesson. Learners prefer productive subjects according to their professional competence. This will affect the purpose of learning mathematics in Vocational Schools in improving students’ mathematical problem solving skills. The development of professional competency-based learning tools is expected to overcome the problem of increasing problem-solving skills of vocational students in the audio video engineering program. This study aims to develop learning tools in the form of Learning Implementation Plans (RPP) and Student Worksheets (LKPD) using the Plomp model which consists of three stages: preliminary research, stage prototype, and assessment phase. This article is a preliminary research phase, which is needs analysis, curriculum analysis, and concept analysis, analysis of students and teachers of vocational mathematics. Audio video techniques. The results in the Preliminary Research stage become a reference in designing products in the form of mathematics-based professional learning devices in the audio video engineering expertise program.
Ludo Game Implementation to Improve Student’s Motivation and Interest to Learn Mathematics for 3rd Grade in SDN 19 Nan Sabaris
Authors: Ulhusna M , Putri S D , Zakirman Z
Published: May 2020

This research is motivated by the low interest and motivation of students to learn mathematics in the third grade of SDN 19 Nan Sabaris. The purpose of this study was to see the effect of Ludo media to increase the interest and motivation of mathematics learning in third grade students of SDN 19 Nan Sabaris. This type of research is quasi-experimental with a sample of all third grade students of SDN 19 Nan Sabaris registered in the 2018/2019 school year. The research instrument used was in the form of a questionnaire to see motivation and student learning interest in mathematics in grade III of SDN 19 Nan Sabaris. The data analysis technique used is paired-sample t-test. The results of data analysis showed that there were significant differences in the results of interest in and motivation to learn mathematics in third grade students at SDN 19 Nan Sabaris. This means that the use of ludo game media can significantly increase students’ interest and motivation in learning about Mathematics.
Curriculum analysis design and creative product craft expertise program in the developing the mathematics learning devices based on realistic mathematics education approach
Authors: Putri I , Armiati A , Permana D , Yerizon Y
Published: May 2020

This research is development research using Plomp development model. This research aimed to analyze the curriculum between mathematics and productive subjects of design and creative product craft expertise program. Analysis curriculum aims to obtain information in developing the mathematics learning devices in the form of Learning Plans and Student Worksheet based on Realistic Mathematics Education (RME) approach
The development of mathematics teaching media based on problem based instruction to enhance grade x high school students’ critical thinking
Authors: Cahyani F P , Irwan
Published: May 2020

This research discusses the development of mathematics learning media based on problem-based instruction (PBI) to enhance students’ critical thinking skill in grade X. The developed learning media are lesson plan and students’ worksheets. The research was conducted until preliminary research phase including need analysis, student analysis, curriculum analysis and concept analysis by using Plomp model (Preliminary Research, Prototyping Phase, and Assessment Phase). Data collected through observation, questionnaire, and interview. The sample is Grade X students of SMAN 15 Padang. The results shown that the learning media used are not facilitating students’ critical thinking skill in teaching-learning process.
Preliminary Research of Model Eliciting Activities learning Based to Improve Junior High School Students’ Mathematical Critical Thinking Ability
Authors: Delfia S , Irwan I , Yerizon Y
Published: May 2020

Mathematical critical thinking ability of junior high school students in Indonesia is still low. Previous studies indicate that critical thinking ability of junior high school students is ≤ 50%. The inavailability of a helpful learning tool turns out to be the ground of lack of development on the students’ critical thinking ability at junior high schools. This condition is the foundation of conducting development research on learning tool using Model Eliciting Activities (MEAs) to improve the mathematical critical thinking of junior high school students. This research is part of the phases of plomp model development that is the premilinary research. The research is investigation study in which the activities in this introductory research are analyzing prerequisite and context (analysis of curriculum, concept and students) and review of related literature. The data are collected through questionnaires, interviews, documentation, and test of critical thinking ability. The data gained are examined descriptively. The subjects of the study are the students of SMP Negeri 8 Padang Grade VIII and the math teacher. Conclusion of this preliminary research is that it is imperative to develop MEAs based learning tool in math learning to advance critical thinking ability of junior high school students.
Development of Mathematics Learning Tools Based on Realistic Mathematics Education for Vocational High School Students
Authors: Doli W , Armiati A
Published: May 2020

Based on the results of observation and experience of researchers as mathematics teachers in one of the vocational high schools in Indonesia, information are obtained that the average mathematics scores of students are still below the Minimum Mastery Criteria. This is caused by: the mind-set of students who think mathematics is not important compared to the subject of vocational specialization, the learning process is less engrossed and interesting because of the teacher’s monotonous teaching style. As a result, students’ interest in learning mathematics is low. To overcome this problem, the teacher must design a mathematics learning strategy in the form of a mathematics learning tool in the form of a learning implementation plan and a student worksheet based on Realistic Mathematics Education (RME). Because the RME-based learning approach starts from ‘real’ things for students. This type of research is development research with the Plump model consisting of the preliminary research phase, the prototype phase and the assessment phase. In this study researchers were only at the initial investigation stage, namely at the student analysis stage. The purpose of this study was to increase students’ interest in learning mathematics. The instrument collection for initial investigation data was observation sheets, questionnaires and interviews with data analysis techniques namely descriptive techniques. The results of the initial investigation of the analysis of learners found that the interest in learning mathematics in vocational secondary school students is very low.
Device Learning Based on Realistic Mathematics Education for Students Tenth Grade of Vocational High School in Hospitality and Tourism Services Program Skill
Authors: Handayani W , Armiati A
Published: May 2020

This study aims to discuss a draft RME-based math learning tool for the students of tenth grade vocational high school of hospitality and tourism services program skill. This study is part of a research model development Plomp. This research only to the preliminary stage of research is the analysis of needs and learners. Data analysis in this study uses an interactive analysis model that consists of data collection, data reduction, data presentation, and drawing data conclusions. The instruments used in this study were interview and questionnaire guidelines. The analysis shows that devices made by teachers are universal to all membership programs and not pay attention to the character of each program skill.
The Analysis of The Junior High School Student’s Characteristic in the Development of Mathematics Learning Device Based on Quantum Teaching and Learning Models
Authors: Pratama Y S , Syarifuddin H , Armiati A
Published: May 2020

This research has aimed to develop a math learning device based on Quantum Teaching and Learning model for seventh-grade students. The learning device which is developed involves learning implement plan and student’s worksheet. The development model which was used in this research is Plomp model. This research only until prototype development, which discuses character analysis of students during the learning process occurs. In learning with Quantum Teaching and learning device, learners study in a group and discuss to understand the concept, so this activity could facilitate the characteristic of learners whose like to have a group and have a discussion. The finding of this research is expected to increase learners to study mathematics and become more active in the learning process.
Improvement of Students’ Activities and Learning Outcomes in Mathematics through Comics-Based on Student Worksheets of Seventh Grade Islamic Junior High School in Padang
Authors: Azizi Nur , Fauzan Ahmad
Published: May 2020

Students need critical, systematic, logical, innovative thinking skills and effective collaboration in the learning process. Students want math learning that is fun, relaxed, easy to understand and the material displayed in a colorful book so it is fun to read and it can be presented in comic form. The classroom action research conducted aims to see the use of comic worksheets. Mathematics learning using comic worksheets can improve learning activities, understanding concepts and can improve students’ mathematical problem solving. Students feel happy if the mathematics material can be presented in comic form because it is easier to understand, presented in the form of pictures and series of stories that can lead in the discovery of concepts so that it is clearer and easier to understand, adds enthusiasm in learning and does not create a tense atmosphere of learning.
The effect of problem-based learning model on students’ geometry achievement by controlling mathematics initial ability
Authors: Jamaan E Z , Musnir D N , Syahrial Z
Published: May 2020

This study aimed to know the difference of geometry learning outcome between students studying with problem-based learning model and students studying with scientific learning approach after controlling mathematics initial ability. The design of this study was non-equivalent control group design. Random sampling technique was used to take the research sample which amounted to 18 students. Technique of collecting data was the tests mathematics initial ability and geometry learning outcome. Data was analysed by using analysis of covariate. The results showed that geometry learning outcomes between students studying with problem-based learning model were higher than that studying with scientific learning approach after controlling mathematics initial ability.
The development of device learning based on contextual teaching and learning improve mathematical communication skills class VII
Authors: Afriani E , Asmar A
Published: May 2020

This study aims to develop mathematical learning devices The aim is for students to be able to communicate ideas with symbols, tables, diagrams, or other media to clarify the state of a mathematical learning problem called mathematical communication skills. it is necessary to develop a device with an approach to improve the student’s mathematical communication skill. The CTL approach can help students to create mathematical communication skills. Because with CTL, students can find the subject learned by linking it to real-life situations so that they can apply it in everyday life. The indicators of communication capabilities developed are Illustrating mathematical ideas, using symbols/notations and mathematical operations, selecting and writing relevant mathematical strategies and giving conclusions at the end of the answer. The development model used is the Plomp model, which consists of three phases. First is the initial investigation phase, the second is the development or prototype development phase, and the third is the evaluation phase.
Preliminary analysis on development of mathematics learning tools based on indicators of mathematical communication skills
Authors: Ramadhani S N , Irwan I
Published: May 2020

The research is aimed to describe data of preliminary analysis on development of mathematics learning tools based on indicators of mathematical communication skills. Mathematical communication skills of senior high school students are still low. Therefore, the research intends to develop learning tools with RME approach by concentrating on redesigning students’ worksheet. This research is a qualitative research because the main data signifies the result of tests of mathematical communication skills. The result of research indicate that the students’ mathematical communication skills based on indicators were still weak and the mathematics learning tools that will be developed contains teaching-learning approach that will help students improving their mathematical communication skills.