bluuebunny/crossref_metadata_2025_split huggingface dataset:
New approach allowing detection of Cl using a pulsedcarbon dioxide (CO2) laser-induced breakdown spectroscopy (LIBS)
Authors: Sari A M , Lahna K , Ramli M , Miura A , Kurihara K , Marwan  , Idris N 
Published: March 2021

Abstract
A new approach to allow detection of Cl emission using atransversely excited atmosphere (TEA) carbon dioxide (CO2) laser-induced breakdown spectroscopy (LIBS), namely utilization of a metal sub-target, was introduced. The Cl sample was prepared from pure chemical powder in the form of a solutiondeposited on the metal sub-target. A zinc selenium lens was used to focus the CO2 laser beam (10.6Mm, 2.5 J, 10 Hz, 200 ns) onto the deposited sample under the surrounding gas of helium (pressure of 1 atm) for generated luminous plasma. An optical multichannel analyzer (OMA) system was used for collecting plasma and acquiring the emission spectrum. It was found that luminous plasma can be produced upon focusing the laser irradiation onto the deposited layer of the sample on the subtarget metal while leaving no ablation from the sub-target metal. Many ionic emission lines from Cl can be detected in the visible region.The ionic emission lines occur withfavorable spectrochemical features, namely strong emission intensity and low background level. Thus, this new approach is promising for conducting Cl analysis using a CO2 LIBS.
Elemental analysis and the impact of Sr substitution on magnetic properties of Nd(1-x)Sr(x)MnO3 (x = 0; 0.5 and 1) perovskite manganite
Authors: Dharmayanti A M R , Munazat D R , Razaq D S , Kurniawan B , Mustaghfiroh Q , Nanto D , Handoko D 
Published: March 2021

Abstract
The series sample of Nd(1-x)Sr(x)MnO3 (x = 0; 0.5 and 0.1) has been prepared with sol-gel method. The elemental compound or chemical characterization of Nd(1-x)Sr(x)MnO3 (x = 0; 0.5 and 0.1) were obtain using Energy Dispersive X-Ray Spectroscopy (EDS). The EDS results show that the elements were all presents in the sample, which also verified that the sample has successfully synthesized. The Vibrating Sample Magnetometer (VSM) was used to measure the magnetic properties of the sample under room temperature. The results show that the material is all soft magnetic with the magnetization decrease as the temperature decrease.
Development of holmium oxide glass calibration system measured using mathematical modelling
Authors: Prihhapso Y , Achmadi A , Suryani D , Farhania W , Nelfyenny  , Zaini H 
Published: March 2021

Abstract
Holmium oxide glass filter has known to exhibit persistence absorption lines across the visible region. Due to these properties, a holmium oxide glass filter is used as a reference standard to calibrate the wavelength accuracy of a spectrophotometer. In this research, a system consists of a double-monochromator and a photomultiplier tube will be evaluated. Mathematical modelling is used to calculate the true value of the absorption lines of the holmium glass filter to compensate for the low optical resolution of the double-monochromator system. Measurement results are validated by comparison with the single-monochromator-order shorting filter system which has higher optical resolving power. Wavelength differences between double-monochromator and single-monochromator systems are better than 0.1% and within the expanded uncertainty of 0.32 nm. Therefore, the double-monochromator system is suitable to provide measurement traceability for the calibration of holmium oxide glass filters.
The strategy of student-worksheet design with a causalitic-learning model to improve creative-thinking ability
Authors: Warodiah Y N , Rokhmat J , Zuhdi M , Kosim  , Ayub S 
Published: March 2021

Abstract
This study aims to identify preparation strategies a causalitic model of student-worksheet (SW) to improve students’ creative thinking ability (CTA). This type of research is a Research and Development with a 4-D model. The research procedure refers to the stages in the 4-D model, namely the stages of defining, designing, developing, and disseminating. The instrument used was the SW validation questionnaire with a Likert scale of 1 to 4. The data were obtained from the SW validation by a validator consisting of 2 expert lecturers and 3 high school physics teachers. The validation result is 86% with very valid criteria. Based on the values and validation criteria, the causal model SW to improve the creative thinking ability of students is suitable for use in learning. The SW preparation strategy includes curriculum analysis, making needs maps, determining the SW title, basic competencies and indicators of competency achievement, central themes, and assessment tools, as well as compiling materials, and paying attention to the SW structure of the eight sets of strategies, there are three are uniques, namely the second, sixth, and eighth steps.
Implementation of causalitic-learning devices to improve creative thinking ability and problem-solving of students in physics
Authors: Rezeki H , Rokhmat J , Gunawan  , Makhrus M , Wahyudi  
Published: March 2021

Abstract
This study aims to test the effectiveness of the causalitic model learning device to improve students’ creative thinking ability and problem-solving. The design of this study was a one group pre-test and post-test design with a purposive sampling technique so that 15 students were obtained. The research instruments used were lesson plans, preliminary assignments, student worksheets, with data collection tools in the form of tests of creative thinking ability and problem-solving. Data were analyzed using calculation of N-Gain.Thus, the implementation of causal learning tools to improve creative thinking skills and physics problem-solving students is effectively used in learning.For further researchers, it is necessary to increase the frequency or duration of learning so that students can better understand learning.
The effectiveness of experiential learning – STEM model with formative assessment in building students’ mastery on fluid dynamics
Authors: Parno  , Mufti N , Widuri K A , Ali M 
Published: March 2021

Abstract
Fluid dynamics is related to science, technology, and daily lives, but students’ understanding of the topic is considered not optimal yet. This study aims to investigate the effectiveness of experiential learning (EL) – STEM model with formative assessment (FA) in building the mastery of fluid dynamics and explore students’ difficulties. This is a mixed-methods research with an embedded experimental design with 34 grade XI students of high school in Malang, Indonesia, as subjects, which were chosen with purposive sampling. This research used dynamics mastering test instrument in the form of 18 reasoned multiple-choice question items with a reliability of 0.65. The data were analyzed with Wilcoxon Signed Ranks test, N-gain, and the description of students’ answers. The result showed that EL-STEM with FA is effective to build the mastery of fluid dynamics with the effectiveness of the subtopic of Bernoulli’s law is higher than the subtopic of Continuity. Before learning, students had difficulties to understand almost all material of fluid dynamics. However, after learning, students only had difficulties to understand certain things, which are the relationship between physical quantities in Bernoulli’s law, the distance between the water reservoir and the water jet, the speed of air under or above the wing of an aeroplane, and the shape of aeroplane’s wing design.
Development of temperature monitoring and prediction system for urban heat island (UHI) based on the internet of things
Authors: Hidayat D J , Soekirno S 
Published: March 2021

Abstract
The population increase in urban areas is one of the primary reasons for changing the local climate, and there is a high impact on the surrounding areas. Due to rapid urbanization, natural land surfaces are being replaced by an artificial land cover which negatively impacts the ecosystem resulting in Urban Heat Island (UHI) effect. It has a detrimental impact on residential environments and implications for human health. Accurate UHI intensity information can be very helpful to take effective urban planning strategies. This research contributes to developing a temperature monitoring system based on the Internet of Things to support UHI information. The system is designed using a DS18b20 temperature sensor. Data from the sensor is processed by the data logger and sent to the server using the ESP8266. The system will process data from sensors into urban and rural temperature information and the UHI index. Besides, an Artificial Neural Network approach presented in this study for predicting temperature to anticipate the impact of increasing the UHI index. As a result, the system could be implemented to provide real-time information about temperature and UHI on the website. Sensor calibrated has a correlation coefficient R2 about 0.99996 and 0.99997 and data sent percentage 100% and temperature prediction using ANN were successfully made with acceptable accuracy of 85.1%.
Effect of annealing hold time on thickness and optical properties of barium titanate solar cell material
Authors: Cahyono Y , Ramadhanti S , Rasmianti  , Dewi Y N K , Asrori M Z 
Published: March 2021

Abstract
The development of perovskite-based solar cells has recently attracted the attention of many researchers because the efficiency value increases rapidly in a short span of time. Third generation solar cells have the potential to achieve Shockley-Queisser Limit of 31% for single energy bandgap solar cells. Besides that, this solar cell technology is economically very promising because the manufacturing costs are cheaper. The main drawback of this solar cell is its low stability (lifetime), which is caused by degradation over its lifetime. In addition, most of the high efficiency perovskite-based solar cells still use lead (Pb), so they are not environmentally friendly. Another alternative perovskite material is required. One promising material is Barium Titanate (BaTiO3). As a material for solar cells, not much research has been done. BaTiO3 film has been successfully made, which is then given annealing treatment at temperature of 500 °C, with annealing time of 30 minutes, 60 minutes, 90 minutes, and 120 minutes. In general, increasing the annealing time increases absorbance, decreases film thickness, decreases energy bandgap, and tends to reduce grain size of film. Energy bandgap tends to decrease with the increasing grain size. The grain size of film decreases with the decreasing thickness. More in-depth characterization and analysis are needed, especially those related to microstructure analysis.
First-Principles study of thermoelectric properties of Half-Metallic Non-Magnetic Half-Heusler alloy Mn2Ge
Authors: Azhar A , Majidi M A 
Published: March 2021

Abstract
Research about Heusler alloys have been massively conducted through experimental and theoretical studies due to their fascinating properties. Most of Heusler alloy compounds exhibit half-metallic behavior, in which one of the spin channels of such a material behaves as a metal and the other behaves as an insulator because there is an open energy gap at the Fermi level. On the other hand, the thermoelectric properties of the materials usually work well in the insulator or semiconductor phase rather than in the metal phase. Motivated by such interesting phenomena, we conduct first-principles study to explore the thermoelectric properties of Mn2Ge, one of Heusler compounds that exhibits half-metallic behavior. Our calculation results show that Mn2Ge of the spin-down channel has a high Seebeck coefficient and ZT value (electron part) at room temperature around 892 MV/K and 0.97, respectively. The positive sign of the Seebeck coefficient on spin-up and spin down indicate that the majority charge carrier in Mn2Ge are positive charges (holes).
Development of multithread acquisition system for high quality EEG signal measurement
Authors: Apriadi W , Gani H S , Prayitno P , Ibrahim N , Wijaya S K 
Published: March 2021

Abstract
This work was concerned on development of the EEG acquisition and EEG signal processing by adding active electrodes and implementing multithread techniques. By using active electrodes, mounting them on the scalp surface would be easier to capture low signals of less than 1µV. The active electrodes were used to reduce noise when transfer signals from the electrode to the acquisition systems which equipped 20 gain. The verification was performed by comparing the active and passive electrodes using NETECH MiniSIM EEG Simulator 330. The advantage of this research was to reduce time delay for EEG signal computation on 32 channels. The acquisition system was based on Raspberry Pi and ADS1299 with multithread signal treatment. Signal filtering was performed into different threads and put all the EEG features into the database. A PC was used to process signal calculation such as processing FFT, signal feature extractions, and signal analysis. These calculations were divided into several functionally independent computations. The signals of each channel were calculated into different threads. The results of this work showed the effectiveness of the multithreaded method for processing large amounts of data (32 channels of 24 bits EEG signal) with low noise levels on the active electrodes.
The influence of Think-Pair-Share (TPS) cooperative learning methods on the results of studying physics assessed from student attention
Authors: Saraswati D L , Sari T A , Kameswari D , Solihatun S , Sirait E D , Apriyani D D , Alfi Z R , Nazelliana D , Ardy V , Rahmawati N D 
Published: March 2021

Abstract
The purpose of this study was to see the effect of the TPS Cooperative learning method on physics learning outcomes in terms of student attention. The research method used was an experimental method. One group was used as the experiment group, namely the physics treatment with the TPS model, While the other group as a control group treated with a model of learning physics discussion. From each group then divided into groups that have high activity and low activity. Based on the results of the analysis, it can be ignored that there is no significant interaction effect between the TPS cooperative learning method and attention to physics learning outcomes. This can be proven where F_count < Ftable (3.289 <4.11) at a very significant level of 5%. which means that there is no significant effect between the Think-Pair-Share cooperative learning method with student attention. So that the Think-Pair-Share cooperative learning method is not appropriate to use to assess the level of student attention.
Video analysis of basketball throws for parabolic motion learning materials
Authors: Azhar T A N , Mulyaningsih N N , Saraswati D L , Nurhayati N , Marliani N , Nursa’adah F P , Sari N I , Lestari I , Nurjanah N 
Published: March 2021

AbstractThe material of parabolic motion is one of the materials considered difficult by most high school students. Therefore, this study aims to analyze the parabolic motion with a contextual approach to throwing a basketball. The research method used was descriptive experimental, namely recording a video of throwing a basketball at a variation of the distance of 2 m, 3 m and 5 m from the thrower’s foot to the hoof. The video was analyzed using tracker software and the parameters measured were time of the ball to fly in the air, the farthest distance, maximum height and total velocity. The results obtained show that distance is directly proportional to time. The thrower was at a distance of 5 m from the foot of the basketball hoop represents more perfect parabolic motion. The conclusion is that basketball games can be used as a contextual approach to the parabolic motion material.
The relation between total column ozone with UV radiation and CO2 concentration on the island of Kalimantan during the Covid-19 Pandemic
Authors: Adriat R , Nurhasanah  , Perdhana R 
Published: March 2021

Abstract
The concentration of ozone in the ozone layer is minimal, but it means a lot to live. The total amount of column ozone varies, mainly influenced by solar radiation and anthropogenic activity. In this study, the total column ozone during the Covid-19 pandemic, and the effect of UV radiation and CO2 concentration on Kalimantan’s island was reviewed. Based on the research results, it can be seen that on Borneo’s island in September and October 2019, the total column ozone reached 0.0056 J/m2. From November 2019 to March 2020, the total amount of column ozone decreased to 0.005 J/m2. The total amount of column ozone increased in April 2020 but declined in May 2020, and from June to September 2020, it increased to reach 0.006 J/m2. The numbers are related but not significant with UV radiation (correlation 0.25) and CO2 concentration (correlation -0.40). It can be concluded that UV radiation and anthropogenic activity affect the total column ozone.
CT scan image segmentation based on hounsfield unit values using Otsu thresholding method
Authors: Katherine  , Rulaningtyas R , Ain K 
Published: March 2021

Abstract
The use of medical images in diagnosing and analyzing various cases in the medical field is commonly used. In certain cases, the image used is not limited to two-dimensional images, but sometimes requires the use of three-dimensional images. CT scan image is an image that has several image slices that can be reconstructed into a three-dimensional image. In the reconstruction process, segmentation plays an important role to get a good reconstruction result and reduce the resulting noise. This study aims to develop a method used in CT scan image segmentation, with the hope that it can simplify the diagnosis process performed by doctors using two-dimensional images or those that have been constructed into three-dimensional images. The main method developed is the Otsu Thresholding method based on the threshold value, which is combined with the Hounsfield unit (HU) value which will be the input for the segmentation process. The image used is a thorax CT scan image with the final goal to get the results of heart segmentation. The results obtained based on the calculation of balanced accuracy for the 30 data tested had an average of 72.54%. The highest result of balanced accuracy for heart segmentation was obtained by data 4 of 77.43%, while the lowest result was obtained by data 29 of 69.1%.
Porosity and compressive strength of PLA-based scaffold coated with hydroxyapatite-gelatin to reconstruct mandibula: a literature review
Authors: Reina S A , Tito B J E , Malini M H , Iqrimatien F G , Sa’diyah E , Aminatun  
Published: March 2021

Abstract
Ameloblastoma is one of odontogenic tumours that is classified as benign, aggressive, and destructive. Mandibular tumours potentially cause bone disruption or damage, so it is necessary to do a resection to remove the infected part. Treatment done by resection may cause defects starting from the gap in the alveolar bone to the discontinuity of the mandible. Thus, it is necessary to reconstruct the mandible using a scaffold. Scaffold is made by using the PLA 3D-printing with the Fused Deposition Modelling (FDM) method. PLA is non-bioactive and hydrophobic, so the surface needs to be modified by coating PLA with hydroxyapatite (HA) and gelatine. This article aims to examine the effect of PLA surface modification using HA-Gelatine through a review article. The searching strategy for articles is by using databases of internationally reputable journals with certain keywords. From the search, journals were obtained (with status Q3, Q2 and Q1) as reference journals in this review. Literature review shows that the addition of hydroxyapatite can improve the bioactive properties of PLA, while the addition of gelatine can increase its hydrophilicity properties. Therefore, HA-Gelatin coating on 3D PLA has the potential to be used as a scaffold for mandibular reconstruction.
Development of an integrated augmented reality experiment module on the topic of motion kinematics on student learning motivation
Authors: Aththibby A R , Kuswanto H , Mundilarto  
Published: March 2021

AbstractThis study was designed to increase student learning motivation by developing a basic physics practicum module on the topic of integrated augmented reality kinematics. This study uses the Analysis, Design, Development, Implementation, and Evaluation (ADDIE) development model. The subjects tested in this study were students of the physics education study program, at one of the universities in Lampung in academic year 2019/2020. The data collection instrument was in the form of a student learning motivation questionnaire. The data obtained were analyzed quantitatively. The results showed that the developed module was suitable for use in learning and practical activities and was also able to increase student learning motivation.
Preliminary spectral investigation on Betel Nut (“Pinang”) using Laser Induced Breakdown Spectroscopy (LIBS)
Authors: Lahna K , Ilyas S , Bakri T K , Ramli M , Nufus H , Idris N 
Published: March 2021

Abstract
Preliminary optical spectroscopy studies have been carried out on betel nut samples using a new analytical tool, LIBS. The LIBS system consists of an neodymium -doped yttrium aluminium garnet (Nd YAG) laser as an excitation source, laser beam conditioning equipment, and an optical multichannel analyzer system (OMA system). Betel nut samples were collected from Aceh, Indonesia. The experiment was carried out under ambient air with a pressure of 760 Torr. It was found that strong luminous plasma could be generated directly from fresh betel nut samples, which resulted in strong emission spectrum. The emission spectrum obtained should have been dominated by host organic matter (C-H-O-N), but not as imagined because the organic host elements did not appear predominantly in the spectrum. Different treatments need to be carried out in further research so that the host organic matter appears. However, some salts, namely Mg, Fe, Na, Ca, Si, Al and K can be detected clearly. These initial investigations hold the promise of LIBS for spectral studies of betel nuts.
Characterization of indicator electrodes using the potentiometric biosensor method as urea sensor with XRD, SEM-EDS, UV-Vis and FTIR
Authors: A Hakim S , Sembiring T , Sebayang K , Situmorang M , Tarigan K , Sembiring K , Mihardi S , Waruwu E N 
Published: March 2021

Abstract
The purpose of this study is the characteristics of the indicator electrode which has been coated with a membrane with XRD, SEM-EDS, UV-Vis and FTIR. Research has been carried out using XRD, SEM-EDS, UV-Vis and FTIR tests on immobilized indicator electrodes 0.0350 g PVA-Enzyme coated with PVC-KTpClPB 0.0120 g and 0.0500 g. The method used was the biosensor potentiometric method with the urease enzyme immobilization technique in PVA coated with PVC-KTpClPB. To see the difference in the absorbance spectrum pattern of each PVA-Enzyme composition coated with PVC-KTpClPB against wavelength with UV-Vis, PVA-Enzim solution as a reference and PVC-KTpClPB solution as the first analysis 0.0120 g and as the second analysis 0,0500 g. To see the PVA-enzyme membrane coated with PVC-KTpClPB in the two compositions above was characterized by FTIR and SEM-EDS. To see the indicator electrode that had been immobilized by PVA-enzyme coated with PVC-KTpClPB in the two compositions above, it was characterized by XRD. It was concluded that the best results were found on the immobilization indicator electrode of 0.0350 g PVA-Enzyme coated with 0.0350 g PVC-0.0500 g KTpClPB.