bluuebunny/crossref_metadata_2025 huggingface dataset:
Pedagogical tool to teach electromagnetic plane wave propagation in various media environments
Authors: Li Anqi , Yin Chengyou , Gan Yongji , Zhang Qianqian , Wu Wei
Published: April 2021

In the usual process of teaching students about the electromagnetic field, students often have difficulty in understanding the propagation process of invisible electromagnetic waves under different medium environments. To facilitate students understanding and learning of related knowledge, in this article, we first derive the process of solving Maxwell’s equation using finite-difference time-domain (FDTD) under different media environments for the designed experimental models to obtain the spatial distribution of the electromagnetic field. After that, we use the MATLAB language to program the FDTD solution method to verify our theoretical analysis based on the simulation results. Based on this, we develop a convenient and quick interactive mobile software tool, aiming to give students a vivid and intuitive demonstration and explanation for the propagation of electromagnetic waves in different media environments.
An attractive/repulsive central-force orbit for student exercises
Authors: Reed B Cameron
Published: April 2021

A closed, attractive/repulsive inverse-square/cube central-force orbit is described. This orbit is suitable for analysis in an advanced dynamics class or as a source of student exercises; it involves no perturbation theory or precession, and reduces to the standard Keplerian elliptical orbit upon a trivial choice of a parameter. The form of the force law, orbital energetics, speed as a function of position, and period are examined.
Lattice-motivated QCD coupling and hadronic contribution to muon g − 2
Authors: Cvetič Gorazd , Kögerler Reinhart
Published: April 2021

We present an updated version of a QCD coupling which fulfills various physically motivated conditions: at high momenta it practically coincides with the perturbative QCD coupling; at intermediate momenta it reproduces correctly the physics of the semihadronic tau decay; and at very low momenta it is suppressed as suggested by large-volume lattice calculations. An earlier presented analysis is updated here in the sense that the Adler function, in the regime |Q
2|≲ 1 GeV2, is evaluated by a renormalon-motivated resummation method. This Adler function is then used here in the evaluation of the quantities related with the semihadronic (strangeless) τ-decay spectral functions, including Borel–Laplace sum rules in the (V + A)-channel. The analysis is then extended to the evaluation of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment,

a

μ

had

(
1
)

, where we include in the Adler function the V-channel higher-twist OPE terms which are regulated in the infrared (IR) by mass parameters which are expected to be ≲1 GeV. The correct value of

a

μ

had

(
1
)

can be reproduced with the mentioned IR-regulating mass parameters if the value of the condensate

⟨

O

4

⟩

V
+
A

is positive (and thus the gluon condensate value is positive). This restriction and the requirement of the acceptable quality of the fits to the various mentioned sum rules then lead us to the restriction

0.1171
<

α

s

(

M

Z

2

;

MS

̄

)

<
0.1180

.
A soft-sensor model of VCM rectification concentration based on an improved WOA-RBFNN
Authors: Gao Shuzhi , Li Xiaoyu , Zhang Yimin , Wang Jun
Published: April 2021

Due to the complex nonlinear relationship among many variables in the rectification process of vinyl chloride monomer (VCM), there is a problem that its concentration is difficult to measure in real time. A method based on the tabu whale optimization algorithm for optimizing the radial basis function neural network (RBFNN) to model the concentration of the VCM rectification process is proposed. Firstly, the t-distributed stochastic neighbor embedding algorithm is used to compress high-dimensional data into low-dimensional space to obtain new data, the input of the soft-sensor model, and to maximize the retention of information about the input data to minimize the impact on the data redundancy model. Secondly, since the whale optimization algorithm (WOA) is prone to produce local optimality, a tabu search algorithm is introduced to help it jump out of the local optimality. Finally, the improved WOA is used to optimize the parameters of the RBFNN model, and the model is applied to the comparison experiment in the process of vinyl chloride rectification. According to the simulation results, the method improves the prediction accuracy of the model and has better practicability.
Micromechanical finite element analysis of effect of multilayer interphase on crack propagation in SiC/SiC composites
Authors: Guangwu Fang , Jie Sun , Xiguang Gao , Yingdong Song
Published: April 2021

The current study presents a micromechanical methodology to analyze the cracking behavior of a SiC/SiC composite with multilayer interphase using finite element method. To capture the constituent level damage initiation and propagation within the multilayer interphase, an axisymmetric unit-cell model was developed by discreetly modeling the fiber, the matrix, and the sublayers of interphase. Moreover, the cracking inside the interphase and debonding at the interfaces between different constituents were taken into account. The extended finite element method (XFEM) was applied to model the cracking inside the interphase and matrix. The cohesive surface approach was employed to describe the debonding behavior at all the interfaces. Adopting the proposed numerical approach, detailed local stress state and cracking behavior of SiC/SiC composites with multilayer interphase were analyzed. The results show that the multilayer interphase has a significant effect on the cracking behavior. Moreover, the growth length of secondary cracks had been demonstrated to be a useful parameter that is capable of connecting composites level behaviors and constituent level damages. From the various numerical methods used, the finite element simulation in conjunction with the XFEM and the cohesive surface approach is a precise and consistent way to analyze the crack propagation and prediction of failure for composites with multilayer interphase. The research provides a fundamental method for promoting the interphase design of SiC/SiC composites.
Role of heavy metal oxides on the radiation attenuation properties of newly developed TBBE-X glasses by computational methods
Authors: Al-Buriahi M S , Alzahrani Jamila S , Olarinoye I O , Akyildirim Hakan , Alomairy Sultan , Kebaili Imen , Tekin H O , Mutuwong C
Published: April 2021

Geant4 simulations and several theoretical approaches such as WinXCOM and ESTAR were used in this work to understand the role of heavy metal oxides on the radiation attenuation features of newly developed TBBE-X glasses which are in the form of 19.5TeO2-30B2O3-30BaO-0.5Er2O3-20X. Here X stands for SrO, Al2O3, CdO, ZnO, PbO and Bi2O3. According to X (modifier oxide), the glass samples were labelled as TBBE-S, TBBE-A, TBBE-C, TBBE-Z, TBBE-P, and TBBE-B. Various attenuation features such as mass attenuation coefficient (MAC), buildup factors, equivalent and effective atomic numbers, half value layer (HVL), and neutron cross section were investigated. The inclusion of high atomic number and dense atoms in the modifiers (PbO and Bi2O3) in TBBE-P and TBBE-B explains why the energy for the onset of increment in MAC was earliest among the investigated glasses. At a photon energy of 15 keV, HVL of TBBE-S, TBBE-A, TBBE-Z, TBBE-C, TBBE-P, and TBBE-B were 4.67, 5.02, 4.40, 3.91, 3.53, and 3.31 cm respectively. It is found that the TBBE-X glasses have promising shielding properties against gamma radiation comparing to different species of commercial glasses and concrete. The outcomes also reveal that the TBBE-X specimens are comparatively better shields against fast neutron compared to classical shields like graphite, water, and ordinary concrete. Therefore, the TBBE-X glasses have promising shielding properties and can be applied in shielding applications against gamma rays and neutrons beam.
Band gap reduction and quenching of p-d exchange interaction in sol-gel derived Zn(Al,Cu)O nanostructures
Authors: Sharma Ankit , Khangarot Rama Kanwar , Misra Kamakhya Prakash , Misra R D K , Chattopadhyay Saikat , Babu P D , Halder Nilanjan
Published: April 2021

The objective of the present study is to address the gap in the fundamental knowledge on the effect of doping and co-doping in ZnO nanostructures. In this regard, we explore the significant impact of Al- and Cu co-doping on band-gap and associated changes in the ZnO system. Sol-gel co-precipitation was used to synthesize ZnO-based nanostructures to accomplish the objective. Crystallite size determined by XRD was in the range of 6.44-37.58 nm and the lattice constant, c, initially decreased with co-doping, accompanied by an increase. Strong co-doping with Cu altered the nature of microstrain from tensile to compressive. FTIR studies predicted that Al and Cu were incorporated at Zn-O site through the formation of Al-O and Cu-O bonds, while UV-vis studies suggested the reduction of the band-gap when Al and Cu were incorporated in ZnO. The underlying reason was Cu-3d and O-2p exchange interaction in Zn(Al,Cu)O system. Quenching of this exchange interaction occurred in the presence of specific combination of dopant and co-dopant, along with blocking of the low energy transitions, eventually leading to a band-gap slightly greater than undoped ZnO. Furthermore, the emission peak observed in the photoluminescence spectra implied redshift induced by Al-doping, which was not influenced on Cu co-doping. Another important observation was the presence of ferromagnetic character in all samples, where saturation magnetization decreased with the increase in Al and Cu content in ZnO matrix, a behaviour attributed to anti-ferromagnetic coupling of spins of Cu ions at the substitutional sites of Zn-O. Lastly, electron microscopy revealed that the morphology of undoped ZnO transformed from granular to sand-rose on doping with Al, while Cu co-doping led to the formation of heavy clusters. The new insights on the band-gap reduction and associated structural changes in doped ZnO-based nanostructured materials have the potential for next generation of spintronic devices.
Enhancing Tensile Strength and Porosity of Self Compacting Concrete (SCC) with Glass Waste Powder
Authors: Prasetyo Wisnu Ari , Sunarsih Ernawati Sri , Sucipto Taufiq Lilo Adi , Rahmawati Kundari
Published: April 2021

Utilization of glass waste powder is an alternative material as a substitute for some cement in SCC concrete because the element contained in the glass waste powder has similarities with cement. Research on glass waste powder as a substitute for some cement using percentage variation that is 5%, 10%, 15%, 20%, 25%, and 30%, with the age of SCC concrete 28 days. The study uses quantitative methods to obtain data on the tensile strength and porosity of the SCC concrete with glass waste powder as a partial substitute for cement. A tensile strength using a cylinder-shaped sample of 150 mm diameter and 300 mm in height with a sample amount per percentage of 4 pieces. The porosity test uses a cylinder-shaped sample of 150 mm in diameter and 300 mm in height with a sample number of each 4 pieces. The results of the study acquired a significant influence of the addition of glass waste powder to strong tensile and porosity of the SCC. Besides, it also obtained the optimal percentage value of the addition of glass waste powder to tensile strength concrete of 5.5% with a maximum value of tensile strength 3.422 MPa. For porosity obtained the optimal percentage value of glass waste powder at 8.583% with a porosity value of at least 9.806%.
Formation of the β-FeSi2 phase by pulsed laser deposition
Authors: Kuznetsov Yu M , Dorokhin M V , Nezhdanov A V , Zdoroveichev D A , Lesnikov V P , Ved M V
Published: April 2021

This paper presents a method for the formation of theβ-FeSi2phase on silicon and sapphire substrates by pulsed laser deposition in vacuum. The analysis of the phase composition of the films, based on the identification of Raman peaks is presented. The magnetic properties of the samples were studied by measuring the magnetic field dependence of the Hall resistance. The presence of a magneticFe3Siphase on a silicon substrate was shown.
Plasma-enhanced atomic layer deposition of GaP/GaN digital alloys
Authors: Uvarov A V , Gudovskikh A S , Baranov A I , Morozov I A , Kudryashov D A
Published: April 2021

This article is concerned with plasma-enhanced atomic layer deposition of GaPN in the form of a GaP/GaN digital alloy at 380°C on a silicon substrate. It was found that the GaP/GaN digital alloy has a uniform structure without significant mechanical stresses and defects at the interface with the substrate. EDX and Raman scattering study confirmed deposition of a monolithic GaPN crystalline material with a total nitrogen content of 7.8%.
Synthesis and study of zinc oxide nanorods for semiconductor adsorption gas sensors
Authors: Anikina M A , Ryabko A A , Nalimova S S , Maximov A I
Published: April 2021

Gas-sensitive coatings based on zinc oxide nanorods were synthesized by a low-temperature hydrothermal method. It was shown that the synthesis of nanorods significantly increases the sensitivity of the samples to isopropyl alcohol vapors. Zinc oxide nanorods are promising for practical application in semiconductor adsorption gas sensors.
Mercury content of Sardinella lemuru caught in East Java and Bali waters
Authors: Sartimbul A , Amandani J A , Yona D , Fuad M A Z
Published: April 2021

Sardinella lemuru is a small pelagic fish which is mostly caught in Java and Bali waters. It is important because of its high Omega-3 fatty acid. As pelagic fish that are found in relatively shallow waters and near the coast, it could be contaminated from the land. The purpose of this study is to analyse the mercury content of S. lemuru caught in three fishing ground in East Java (Prigi and Muncar) and Bali (Kedonganan). Fish samples were taken by random sampling and collected from November 2019 to March 2020 and analysed for mercury content using the Cold Rapoun Atomic Fluorescence method using the Atomic Absorption Spectroscopy (AAS) Shimadzu AA-6200. Furthermore, the Estimated Daily Intake (EDI) and Maximum Tolerable Intake (MTI) are calculated. The results showed that mercury concentration in S. lemuru were 0.938 ± 0.45 mg/kg and 0.58 ± 0.65 mg/kg for Kedonganan and Prigi, respectively. While, there is undetected mercury for Muncar fish samples. The mercury concentration identified are above the Indonesia standards (SNI and BPOM = 0.5mg/kg). Moreover, the EDI value was higher than Provisional Tolerable Daily Intake -WHO. The mean value of MTI is 0.121 mg/week. If fish contaminated mercury was consumed in one week exceeds the MTI value, the heavy metal could affect the human health.
The study of structural properties and photocatalytic activity of ZnO prepared by ultrasonic assisted precipitation method
Authors: Sanusi S , Setiadji S , Hakim N D , Aziz S H R A , Sawitri A , Aliah H , Hadisantoso E P , Ivansyah A L , Syarif D G
Published: April 2021

ZnO is a semiconductor that has excellent activity as photocatalyst under UV light region. ZnO is precipitated by adding oxalate acid onto zinc acetate dehydrate solution with ultrasonic assisted at various times and flattened at 500 °C. The structural properties of the ZnO samples are characterized by X-Ray Diffraction (XRD) and Brunauer-Emmett-Teller (BET). XRD result has confirmed the ZnO structure as hexagonal phase. Rietveld refinement of XRD pattern by La Beil method is employed to analyze the lattice parameters of ZnO. It provides that ZnO as wurtzite with accurate values. Debye-scherrer equation examines the crystallite size. It is confirmed that the crystallite size of ZnO is decreased by ultrasonic assisted at precipitation. BET result shows that ultrasonic assisted could increase the surface area of ZnO, which are 45.64 m2/g of ZnO without ultrasonic assisted and 143,487 m2/g of ZnO with ultrasonic assisted along 2 hours. The photocatalyst experiment is set up to analyze the photocatalytic activity of ZnO for degradation of methylene blue under UV light irradiation. By significantly that decolorization of methylene blue occurred at pH 10 for 30 minutes irradiation. The photocatalytic activity for ZnO samples with an hour and 2 hours ultrasonic assisted are 79.54 % and 86.50 % respectively, whereas ZnO sample without ultrasonic assisted is 70.90 %, and almost all of methylene blue contaminant have done degraded successfully after 120 minutes irradiation. According to the results, the structural properties and photocatalytic activity of ZnO are increased as consequence to the presence of ultrasonic assisted on precipitation.
Analysis of cyclamate sweeteners in elementary school student’s drink in South Denpasar Subdistrict
Authors: Singapurwa N M A S , Yunantariningsih I D A , Sudiarta I W , Candra I P , Semariyani A A M
Published: April 2021

Cyclamate is an artificial sweetener with a sweetness level of 30- 40 times greater than sucrose. This study aimed to determine the content and levels of cyclamate sweetener in unmarked beverages without labels that are prepared and sold by elementary school canteens in South Denpasar District. This research is a type of descriptive research that uses survey methods with simple random sampling techniques and experiments in the laboratory. The number of elementary schools in South Denpasar District is 72 schools. The population in this study were 145 types of unmarked beverages without labels that were prepared and sold by elementary school canteens in South Denpasar District. The number of samples sampled is 110 samples. The parameters of artificial sweeteners in this study were cyclamate tested by HPLC. Research data are presented in tables, graphs and analyzed descriptively. The results showed that of 110 samples containing 62 cyclamate (56.36%). Cyclamate levels that exceed the maximum limit requirements so that they do not meet the requirements of 44 samples (40%) and meet the requirements of 66 samples (60%), according to the maximum allowable limits refer to the Head of the Indonesian National Agency for Drug and Food Control No. 4 of 2014.
Phytochemical and antioxidant capacity test on turmeric extract (Curcuma longa) traditionally processed in Bali
Authors: Permatananda P A N K , Aryastuti A A S A , Cahyawati P N , Udiyani D P C , Wijaya D , Pandit I G S , Wirajaya A A N M
Published: April 2021

Bali is an island that is famous for its culture, including traditional medicine. In traditional medicine, the Balinese use various kinds of medicinal plants, one of which is Turmeric. The purpose of this study was to determine the ways and objectives of the use of turmeric by Balinese, as well as the phytochemical content and antioxidant capacity of turmeric extract which is traditionally processed in Bali. The method and purpose of utilizing turmeric were obtained through observation and interviews with 900 Balinese respondents. Quantitative phytochemical tests include starch, protein, flavonoid, tannin, phenol and vitamin C levels and qualitatively for the presence of triterpenes, steroids, alkaloids, and saponins. Antioxidant capacity was measured using the DPPH method. Through this research, we found there were only 36.8% of respondents had ever used turmeric as a traditional medicine. Utilization of turmeric was mostly in the form of loloh or traditional drinks. Phytochemical test results showed turmeric extract had 67.38% starch, 3.42% protein, 2709.39 mg/100 gr flavonoids, tannins 291.64 mg/100gr, phenol 1584.04 mg/100 gr, and vitamin C 0.06 mg/100gr. Qualitatively, turmeric extract contained triterpenes, alkaloids, and saponins, but did not contain steroids. The antioxidant capacity of turmeric extract was 70.9 mg/L GAEAC. Turmeric extract is a traditional medicine made from nature that is most commonly used by Balinese and very potential to be developed as an antibacterial, antioxidant, anti-inflammatory, or other benefits that still need further investigation.
Computational modeling of inclusion complex between aromatic amine and calixarene analogs using Semiempiric Quantum Method (SQM)
Authors: Ivansyah A L
Published: April 2021

PM3 Semiempiric Quantum calculation has been done in this research by using Gaussian 2009 Rev. D 01 software package to explore the capability of Calixarene and its analogs for aromatic amine extraction. The Calixarene analogs used in this research are Calixpyrrole, Calixpyridine, Thiacalixarene, Heterocalixaromatic, Calixcarbazole and Calixnaphtalene; and the aromatic amine used in this research are Aniline, 4-Chloroaniline, Toluene-2,4-diamine, 2-Naphty lamině, 4,4’-Mety lenbis(2-chloroaniline), 4,4’-Metylendianiline, N-Nitrosodiphenylamine, Benzidine, 2-Aminobiphenyl, 2-Amino-1-methyl-6-phenylimidazo[4,5-b] Pyridine, 3-Trifluoromethylaniline, p-Phenylendiamine, o-Toluidin, 4-Chloro-o-toluidin. The most suitable host molecule of calixarene analogs for extraction of aromatic amine compounds are Calixnaphthalene and Calixpyridine because all of aromatic amine compounds form inclusion complex with them spontaneously shown by negative value of binding energy.
Puree sweet potato substitution in wet noodle processing
Authors: Mahmudatussa’adah A , Maulani R R , Patriasih R , Karpin K , Setiawati T , Juwaedah A , Nurani A S , Wiraatmadja E L
Published: April 2021

Wet noodles are generally made from flour and water or other additives. They are formed in a typical noodle and have been through the process of boiling or steaming. Wheat flour is derived from wheat which cannot grow well in Indonesia. One of the drawbacks of wheat flour that has less natural color. Sweet potato is one source of carbohydrates with cream, yellow, orange and purple flesh. The natural color in the sweet potato has a function as a good antioxidant to maintain body health. The disadvantage of sweet potato does not contain gluten, which functions as a form of elasticity in the noodles. Thus in this research, sweet potato puree substitution will be carried out in the processing of wet noodles. The method used is an experiment with a complete random design. The results showed that the maximum amount of sweet potato puree added was highly dependent on the amount of water content of the sweet potato puree. Orange sweet potato puree has a higher water content than yellow, cream and purple flesh sweet potatoes. Comparison of the amount of sweet potato puree with 1: 1 flour, except for the orange flesh sweet potato 0.8: 1. The time of kneading and the time of the attainment of a smooth noodle dough is highly depend on the water content of sweet potato puree. The higher water content, it leads to form a smooth mixture. The addition of sweet potato puree can extend the shelf life of wet noodles in the refrigerator temperature.
Multivariate weather anomaly detection using DBSCAN clustering algorithm
Authors: Wibisono S , Anwar M T , Supriyanto A , Amin I H A
Published: April 2021

Weather is highly influential for human life. Weather anomalies describe conditions that are out of the ordinary and need special attention because they can affect various aspects of human life both socially and economically and also can cause natural disasters. Anomaly detection aims to get rid of unwanted data (noise, erroneous data, or unwanted data) or to study the anomaly phenomenon itself (unusual but interesting). In the absence of an anomaly-labeled dataset, an unsupervised Machine Learning approach can be utilized to detect or label the anomalous data. This research uses the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm to separate between normal and anomalous weather data by considering multiple weather variables. Then, PCA is used to visualize the clusters. The experimental result had demonstrated that DBSCAN is capable of identifying peculiar data points that are deviating from the ‘normal’ data distribution.
Classification of diabetes disease using decision tree algorithm (C4.5)
Authors: Permana B A C , Ahmad R , Bahtiar H , Sudianto A , Gunawan I
Published: April 2021

Diabetes is one of the most common health problems in the world. Diabetes is also known as “the silent killer” because according to WHO (2016) diabetes increased from 108 million in 1980 to about 422 million adults had diabetes in 2014. If not handled properly, diabetes can become chronic and damage other organs and can cause death. This disease has several symptoms in the patient but evaluating the different factors or symptom variables required to determine which variables are more dominant. This research aims to establish the most influential variable of the many variables causing diabetes mess. We suggest using a data mining decision tree (C4.5) in this paper to forecast diabetes to help doctors analyse the disease sooner. Data mining has carried out various approaches to predict a disease, one of them is the use of c4.5. In this research, produce a decision tree and the result shown that polydipsia play a role in diabetes with accuracy 90.38 %. One of the most dominant signs of diabetics is the sign of polydipsia.
Understanding and assembling user behaviours using features of Moodle data for eLearning usage from performance of course-student weblog
Authors: Chayanukro S , Mahmuddin M , Husni H
Published: April 2021

In reality, students learn via eLearning (electronic online learning) system in different ways depending on their learning needs, learning behaviours as well as eLearning system policy for users. However, most learning outcome prediction models of eLearning systems are still not stable and still cannot be applied in many situations as the use of eLearning is considered to be highly dynamic. Therefore, the objective of this work is understand if eLearning system can be predicted based eLearning usage by exploiting Moodle log data. To understand it, features from web log course-student in Moodle is being considered, a number of machine learning techniques also have been applied for benchmarking in this study. The result found that the current group doesn’t give better understanding and significant groups of factors that could be able to predict the learning outcome.
The effect of task technology fit and entrepreneurship education on student’s entrepreneurship intention using the theory of planned behaviour
Authors: Rustiana R , Mohd O , Mohamad N
Published: April 2021

Entrepreneurship has been proven in various researches in the world to help improve the welfare of society by creating jobs. Many universities in the world have adopted entrepreneurship in their curriculum designs in the form of entrepreneurship education. Besides, the technology fit task variable is also important in increasing student entrepreneurship intention. Therefore, research on entrepreneurship intention (EI) and the factors that influence it among students is very relevant. This study aims to fill the knowledge gap in the effect of task technology fit (TTF) and entrepreneurship education (EE) on entrepreneurship intention (EI) by using the theory of planned behavior (TPB) model. The research sample was 213 undergraduate students at one of the private universities in Yogyakarta selected by the Slovin method. Data were collected through a questionnaire shared with the student by MS Form. Regression analysis tools were used to test the research hypothesis. These results prove that H1, H3a, and H3b have a positive effect on EI with different levels of significance. Meanwhile, H2 has a negative influence on EI. This study has contributed to filling the knowledge gap that TTF and EE can be integrated into the TPB model.
Performance of Cosmos caudatus chlorophyll dye on TiO2 nano particles coating in the manufacture of Dye-Sensitized Solar Cells (DSSC)
Authors: Darmawan M I , Zaidah A , Hidayatulloh A , Mentari I N , Utami E F , Hardani H
Published: April 2021

Energy derived from fossils is diminishing and cannot be renewed. Therefore many experts are looking for other alternatives to create new renewable energy, and Dye-sensitized solar cells (DSSC) are one of them. This study aims to know the characterization of the electrical properties of dye cosmos caudatus material. The research was conducted at the UNS FMIPA Materials Laboratory. This research uses the TiO2 deposition method with the spin coating technique. Absorbance test using PC UV Visible Spectrophotometer 1601 and Current and voltage test (I-V) using Keithley. The efficiency produced by the Cosmos caudatus chlorophyll dye was 8.3 × 10−3 %. These results show that some natural dyes from natural organic material extraction have an absorbance spectrum range of 300-800 nm, which has the potential as DSSC.
Bibliometric analysis of research on mathematical literacy in Indonesia
Authors: Ahyan S , Turmudi T , Juandi D
Published: April 2021

Many researchers research mathematical literacy, but there are no articles that discuss how research has developed over a certain period in Indonesia. This article aims to discuss how bibliometric analyses research mathematical literacy during Indonesia’s last ten years. Besides, knowing the description of mathematical literacy research trends in the future. There were 46 bibliometric analyses of articles taken from the Scopus database. Articles were analyzed using Scopus Applications and VOSviewer version 1.6.12. The results showed that 46 articles analyzed in international journals were either still valid or discontinued by Scopus. Furthermore, the term mathematical literacy is most dominant in research and article writing. Finally, research on mathematical literacy is still up-to-date researched in the future, especially related to the learning and assessment process, curriculum development that supports mathematical literacy, and the involvement of teachers, parents, and society in supporting students’ improvement’ mathematical literacy.
Development of matemathic media games education based on e-learning in the Planting of Basic Concepts in Numeracy
Authors: Nurfatanah N , Yudha C B , Marini A , Sumantri M S
Published: April 2021

The purpose of this research is to design and create an educational game based on e-learning Matemathic on the Basic Concept of Counting. The method of this research is research and development. This research was conducted in DKI Jakarta Elementary School class V and the object of research was an educational game based on e-learning Matemathic in the Counting of Basic Concepts as a medium of mathematics learning. The method used in data collection is observation and documentation, and the method of data analysis is quantitative descriptive analysis techniques. The results of this study are in the form of an educational game based on e-learning Matemathic in the Numeracy Basic Concept Planting as a learning media for class V. Material expert validation of learning media material based on the quality of the material and the usefulness of the material gets a percentage of eligibility of 76, 56%. The assessment of media experts on the quality of instructional media is based on the characteristics of the media in learning multimedia gets a percentage of eligibility of 86, 68%. The results of the assessment on product trials are divided into three aspects, namely aspects of screen display design, program operation, navigation, and expediency. Overall assessment results of 68 grade V students obtained a percentage of eligibility of 92,94 % so that this learning media is appropriate to be used as grade V mathematics learning.
Credit scoring model using MARS method to comply with FSA regulation
Authors: Afrilia A , Joharudin A , Zaky M , Budiman B , Fauziah M
Published: April 2021

Financial Service Authority (FSA) introduced a new policy on Sustainable Finance to financial institutions such as Banks. It is currently a hot issue that needs to be implemented in the selection process of potential debtors. Consequently, the credit rating system needs to be renewed. Statistical methods can help to include permits and environmental impact in the selection process. Thus, this study intends to formulate a credit rating model for productive debtors. This study used a quantitative method using Multivariate Adaptive Regression Splines (MARS). Our study’s significant finding is that the credit rating model for productive debtors that have been formulated has type I error of 0.00% and type II error of 0.54%. Furthermore, the authors believe that this model can be used to asses potential debtors’ credit rating while adhering to the policy of Sustainable Finance.
The impact of natural disasters in Indonesia: How does welfare accentuate and attenuate the loss of people?
Authors: Prasojo A P S , Surtiari G A K , Prasetyoputra P
Published: April 2021

The increasing number of disasters in Indonesia exerts significant economic loss and human casualties, whereas Indonesia has focused on disaster risk reduction. Recent studies are lacking to explore how economic growth influences the impact of disasters. This paper aims to seek a deeper understanding of how welfare that represented by the human development index influences the impact of disaster on the people. We implement the concept of welfare and risk reduction as an approach to analyze disaster and welfare data with a focus on flood events in 2008-2018. We obtained the data from BNPB and Statistics Indonesia. We fitted a multivariable negative binomial regression with ‘human losses from deaths’ as the outcome and provincial Human Development Index (HDI) and provincial gross domestic product (GDP). The results suggest that Provincial HDI is negatively significant associated with human losses from deaths. However, GDP was also found to be positively significant associated, albeit less strongly, with human losses from deaths. These associations bring about potentially significant policy implications.
A measurement of various length of the stack on a standing wave thermoacoustic refrigerator
Authors: Achmadin W N , Kharismawati I , Trianggono M M
Published: April 2021

A thermoacoustic refrigerator is a capable device to produce temperature differences with acoustic work (sound waves) as the source. The advantage of these machines is that the working gas medium used is air, so it doesn’t produce much pollution and of course, it is environmentally friendly. This paper describes the measurement of stack length variations ranging from 4 cm to 7 cm on the performance of the standing wave thermoacoustic refrigerator. This study aimed to find the optimum stack length in a thermoacoustic machine with a resonator pipe length of 80 cm. Operation time is carried out for 30 minutes. The main components of a thermoacoustic device consist of a regenerator, resonator pipe, and a loudspeaker. The regenerator has a big role, namely as a place for energy conversion to occur. The results obtained are a temperature decrease, a temperature increase, and a temperature difference. The results showed that the temperature decrease and the temperature difference on the stack length of 7 cm were the decrease in temperature and the maximum temperature difference with the results of 4.6°C and 9.3°C, respectively. Therefore a standing wave thermoacoustic refrigerator with various lengths of the stack has been experimentally studied.
Ethnomicology of Basidiomycota fungus species in Central Kalimantan open forests
Authors: Hujjatusnaini N , Erawati D , Melisa M , Nor F , Shartono D F , Harlyani Y , Zulham M
Published: April 2021

The role of fungus Basidiomycota can be used as an indicator of wisdom and the level of maturity forest ecosystems, both as decomposers, symbionts, and pathogens. The existence of several species of edible mushrooms is also used by local communities as food and medicine. This study aims to identify the diversity of fungus species in Central Kalimantan’s open forests, as part of ethnomicological information. The method used was the purposive sampling technique. The results showed 3,715 fruiting bodies of mushroom from 120 species and 41 genera were found at the study site with moderate levels of biodiversity (R ‘= 3.51; H’ = 2.14; D ’=0.68). Based on the study of ethnomicology information obtained 5 species of edible mushrooms that are commonly consumed by local communities, such as, cloud ear fungus (Auricularia polytricha), Oyster Mushroom (Pleurotus ostreatus), Hygrocybeal calc, Cantharellos, and Common Puffball (Lycoperdon pertatum). For the type of fungus that is used as an ingredient for disease treatment, 2 types are found, namely polyporus cinnabarius, and ganoderma. The research findings found that Central Kalimantan’s open forest biodiversity is still quite good, with a moderate level of diversity. Besides, ethnomicology can be developed as local wisdom in Central Kalimantan.
Design of Simple Harmonic Motion (SHM) devices based on IR obstacle sensors
Authors: Setya W , Fariha D N , Handayani W , Syafe`i A
Published: April 2021

The development of science and technology is inseparable from the availability of hardware and software. One of its uses is teaching aids in physics practicum, especially simple harmonic motion. Digital technology can shorten the time in the implementation of practical work in the field. In this study aims to design a simple harmonic motion practicum tool using Arduino Uno based on IR resistance sensors. Data was collected using a small angle of 10° with variations in the number of waves and time obtained. The results will be displayed on the LCD. This study also compares the results of recording digitally and manually. Based on the data obtained, the results of digital experiments are more accurate than the results of manual experiments with an accuracy of 96.69% and digital SHM device experiments also show precise results. So that digital SHM tools can be performed on physics experiments in simple harmonic motion material.
Complex permeability, permittivity and microwave absorption properties of barium hexaferrite synthesized from natural iron sand
Authors: Handoko E , Sugihartono I , Marpaung M A , Budi S , Fahdiran R , Randa M , Jalil Z , Alaydrus M
Published: April 2021

In this paper, the barium hexaferrite was successfully prepared by a conventional ceramic method and the precursors of BaCO3 and natural iron sand from Puger Beach, Jawa Timur-Indonesia. To develop a microwave absorbing material, the complex permeability, permittivity, and microwave absorption ability were investigated using a vector network analyzer (VNA) in the frequency range of 8.2-12.4 GHz. The results showed that barium hexaferrite presented an excellent broadband absorption (>90%, RL <-10dB) and a suitable absorber with high broad bandwidth and attenuation in the microwave frequency range.
Markerless augmented reality: Display Compton scattering model
Authors: Bakri F , Sumardani D , Muliyati D
Published: April 2021

Simulations were performed using markerless augmented reality on the concept of Compton scattering. Compton scattering identifies that photons can not only behave as waves but also behave like particles. The process of colliding photons with electrons causes dispersion which shows that the photon has momentum. This article will explain a photon collision simulation to prove the state of light dualism by utilizing augmented reality technology. The development of this simulation was tested using the black-box testing method. Interactive media using augmented reality for Compton scattering simulations can display the concept of collisions between photons and electrons. Our simulation successfully simulates the mechanism of energy release and momentum changes before and after the contact.
Analysis of concept understanding and skill of problem solving on circular motion topic using Creative Problem Solving model
Authors: Pratiwi H Y , Jufriadi A , Trisilawati C V , Ayu H D , Sujito S
Published: April 2021

Technology development in 4.0 industrial revolution era demands students to have 21st century skills, one of them is the skill to solve problems. The aim of the research is to describe and analyze the concept understanding and skill of physics problem solving on circular motion topic using creative problem solving (CPS) model. The research was conducted in one of State High Schools in Malang. The sample consisted of sixty eight students divided into one experiment class group and one control class group. The technique of data collecting used test of concept understanding in the form of multiple choices and test of problem solving in the form of problem analysis. The data analysis used two-ways anova. The result of the research shows that there are; concept understanding of students that are taught using CPS is higher than using Problem Solving (PS) model, (2) concept understanding of students who have high and low problem-solving skills that are taught using CPS is higher than using PS model.
Measurement system development of refractive index, salinity and magnetic field parameters on liquid waste polluted water
Authors: Indrasari W , Umiatin U , Fitriani N
Published: April 2021

A Prototype of liquid waste polluted water measurement system based on refractive index, salinity, and magnetic field parameters, has been developed. The instrument consists of Potentiometer, Light Dependent Resistor (LDR), conductivity sensor, Hall Effect sensor, and microcontroller. Potentiometer and LDR sensors are used to measure the refractive index, a conductivity sensor as the salinity measurement device, Hall Effect sensor as a magnetic field detector, and Arduino UNO as the control system. Each sensor has been characterized using a standard measuring instrument to determine sensor sensitivity. The characterization results showed that the refractive index sensor has a sensitivity of 321.8 mV/refractive index unit and a relative error of 0.35%. The conductivity sensor has a sensitivity of 415.2 mV/ppt and a relative error of 5.26%. The magnetic field sensor has a sensitivity of 0.0077 Volt/Gauss and a relative error of 4.29%. The prototype was used to measure the water quality of an artificial wastewater and river water samples. The artificial wastewater was made of the composite of water, salt, and liquid soap with different concentrations, and the river water samples were taken from ten different regions. The results show that the addition of salt and liquid soap concentration was directly proportional to the refractive index, salinity, and magnetic field. All samples have salinity below the normal threshold of <0.5 ppt.
Applying differential equations for study magnetohydrodynamic phenomenon on the solar surface
Authors: Sujito S , Wisodo H , Pratiwi H Y , Setyahadi B , Soewono E , Suhandi A , Liliasari L
Published: April 2021

The aim of this research is to study the magnetohydrodynamic (MHD) phenomenon on the solar surface by apply differential equations. We are trying to understand and explain the processes from observable solar layers to deeper layers, by using plasma theory and data analysis that may construct understandings to solar physics. This research is done by combining the MHD simulation and data of solar observation results. MHD simulation was carried out in the theoretical laboratory, physics department, UM. Data on the sun’s observation were obtained from LAPAN Watukosek Jawa Timur. The results of this study are the coronal solar helmet streamer structure is degraded and the MHD equilibrium ends before it erupts. This is shown by the simulation results using data obtained from observations, namely the degradation of colors from the strongest to the weakest. This shows the existence of weakening energy before finally experiencing an eruption. The phase was terminated by the coronal mass eruption (CME). Activity to the surface of the corona to the inner layer is outside our technology to observe directly. Therefore, the conclusions in this article are made using the plasma flow approach at high temperatures.
Logic Controller-Based Discontinuous Reception (DRX) System for NR
Authors: Zhang Ziyang , Zhang Xin
Published: April 2021

In Long Term Evolution (LTE) system, discontinuous reception (DRX) mechanism is widely used as a reliable and effective means of reducing energy consumption. Moving to 5G New Radio, the application scenarios of massive Machine Type of Communication (mMTC) have become increasingly clear, which will support ultra-large-scale device accessing into the network. Therefore, the need for energy efficiency improvement of terminal equipment is becoming more and more urgent under 5G NR. In this paper, a logic controller-based DRX system was proposed to make original DRX more efficient. With logic controller, DRX parameters can be adaptively adjusted by learning the information of historical delay time and packets arrival rate. And then, a better performance of energy conservation will be achieved. Simulation results show the performance improvement of the proposed DRX system.
A Broad Learning System to Enhance Performance of Speech Emotion Recognition
Authors: Xu Zhuofan , Yang Xu
Published: April 2021

Speech emotion recognition (SER) is a difficult task because emotions are subjective and recognizing the affective state of the speaker is challenging. To tackle this issue, Broad Learning System is presented to balance the training of networks that are substantially faster than those used previously. Furthermore, we performed experiments on the standard IEMOCAP dataset and achieved the state-of-the-art performance in terms of weighted accuracy and unweighted accuracy. Taken together, the experimental results demonstrated that applying Broad Learning System to SER is reasonable and useful.
remote sensing image striping noise algorithm based on region-weighted double sparse constraint
Authors: Zheng Yi , Zhou Feng , Wang Guoyou
Published: April 2021

Infrared remote sensing image has been used in many fields such as land cover crop monitoring, climate monitoring, military strike and early warning. In spaceborne remote sensing imaging system, the stripe is a common noise, seriously affects the researchers’ study of the ground scene. In recent years, the framework that researchers based on different principles use a variety of methods to remove fringe noise in infrared remote sensing images is proposed, such as filtering based method, the method based on statistics, however, most current algorithm still exist the following two problems: some structure or texture was easy to be mistaken as the stripe noise and removed, lost the original information of the image; in some bright or dark areas, it is easy to create artificial traces, adding redundant information and making the denoising result look unnatural. In view of the above two problems, this paper will analyse the causes of the problems and propose a stripe noise removal algorithm based on the region-weighted doublesparse constrained unidirectional variational model, which can effectively reduce the above two phenomena.
Text Detection in Trademark Images under Semi-Supervision
Authors: Shi Xupeng , Wang Shaozhi , Tan Xiao
Published: April 2021

The texts in trademark image usually contain characters, text lines and other different parts. Therefore, compared with the detectors that can detect text lines directly, the detector that can detect characters is more suitable for the detection of texts in trademark images However, training character detectors needs a huge number of characters with position annotation, the con-struction process of this type of dataset will take a lot of time. In order to overcome the limitations of the detectors trained by datasets with word-level annotations and the shortage of datasets with character-level annotations, we propose a text detect method that can detect the single character in trademark images. Our proposed model is pretrained by the synthetic image dataset with character level annotation, then the pretrained model is used to detect the unannotated trademark images dataset to find more annotations for retrain the pretrained model. We also construct a trademark text dataset, which includes 4500 images. Experimental results on our dataset demonstrate our method can achieve the state-of-the-art performance compared to other methods. The results show our detector can detect complicated texts in trademark images.