bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of laser energy on the optoelectronic properties of NiO/Si heterojunction
Authors: Khashan Khawla S. , Saimon Jehan A. , Hadi Aseel A. , Mahdi Rana O. 
Published: March 2021

AbstractIn the current work, NiONPs/Si Heterojunction Photodetector was fabricated using a drop-casting method of the Nickel Oxide (NiO) nanomaterial (produced by laser ablation in the water) on silicon (Si) substrate. The impact of laser energy on the preparation of NiO nanoparticles was investigated. The shape of the NiO NPs was a quasi-spherical particle with average particles size 16, 20, and 24 nm with high aggregations. The bandgap was direct and varying from 3.8 to 3.6 eV; relies on the laser energy. The current-voltage characteristics of NiO/Si heterostructure photodetector have a good rectifying property with suitable high spectral responsivity at the UV region, which found that the best value is 0.8 A/W @ 330 nm for a sample produced at 700mJ.
Synthesis, Characterization and Optoelectronic device application of ZnO nano structure
Authors: Abed Ali L. , Khalef Wafaa K. , Salim Evan T. 
Published: March 2021

Abstract
A clear ZnO nanowire was obtained using the Pulse laser deposition technique on a silicon and quartz substrate. Thermal oxidation at 650 °C for 1 hour was used, employing conventional tube furnace. The structural properties ensure the formation of quantizing ZnO. The electrical properties of prepared ZnO NWs/Si films reveal a good rectification with maximum optical Responsivity in the UV region reach to 0.3A W.
A comparative Analysis of PV Cell Mathematical Model
Authors: Rasheed M. , Mohammed O. Y. , Shihab S. , Al-Adili Aqeel 
Published: March 2021

AbstractSeveral methods are currently used to calculate the values of voltage, current, and power of a solar cell. A new method is suggested to numerically find these values using the popular methods Newton Raphson method (NRM) and the three-step method (TSM) at different values of load resistance R. Equation based on the equivalent circuit of a solar cell, so all calculations is performed in a MATLAB at room temperature. The obtained results of this new method were presented and compared with NRM. Additionally, a single diode model of a solar cell was demonstrated.
Influence of Laser wavelength on morphological and optical properties of ZnO nanoparticles prepared by laser ablation in water
Authors: Yousif Nwar A. , Al-Jawad Selma M. H. 
Published: March 2021

Abstract
Nanoparticles (NPs) of Zinc oxide (ZnO) were prepared utilizing pulsed laser ablation of a Zinc metal plate in deionized water without utilizing surfactant. The effect of Laser wavelength on the characterization of ZnO was investigated. The 1064-nm and 532-nm wavelength beams produced from a Q-switched Nd: YAG laser at 10 ns pulse duration were employed. The SEM images displayed that the average diameter of the Zinc oxide NPs generated by the laser wavelength 532-nm are larger than the 1064-nm laser wavelength nanoparticles. Various sizes were observed of round ZnO nanoparticles in the SEM image. As the laser wavelength increased, the density of the nanoparticles in water increased. UV–vis analyses revealed that the absorption peak located at 342 nm (1064nm) and 344 nm (532nm). The nanoparticles formed at 1064 nm exhibited higher absorbance than the nanoparticles formed at 532 nm. The optical band gap is considered to be 3.42 eV for 1064 nm and 3.4 eV for 532 nm.
Preparation and characterization of colloidal Au-ZnO Nanocomposite via laser ablation in deionized water and study their antioxidant activity
Authors: Rashid Taha M , Jabi Majid S , Nayef Uday M 
Published: March 2021

Abstract
A synthesis is carried out with Au-ZnO nanoparticles (NPs), using fundamental laser Nd:YAG (1064 nm) of Au and ZnO colloidal solution, with the metal objectives in deionized water being extracted, accompanied by laser radiation a second harmonic Laser 532nm with the mixed colloidal solution, The UV-visible display the Au nanoparticle peak at 525nm, and the ZnO peak at 415nm. The Au-ZnO NPs show a shift of the ZnO absorption at 390nm, which is excited, and a change in the Au absorption at 530nm, as the Au NPs plasmon resonance is transmitted through an interface charge. The optical band gaps of the ZnO, Au and Au-ZnO NPs are increased with laser fluence up to 13.8 J/cm2. The antioxidant activities of prepared nanoparticles were measured using DPPH assay. The results showed the ability to scavenging of free radicals. Taken together, the results of this study demonstrated that the Au-ZnO nanocomposite could be used in future for therapeutic purposes.
Optical and Structural Properties of the Gold Nanoparticles Ablated by Laser Ablation in Ethanol for Biosensors
Authors: Ali Hiyam S. , Fakhri Makram A. , Khalifa Zeina 
Published: March 2021

Abstract
In this paper, the laser wavelength effects on the physical properties of the gold nanoparticle (Au NPs) ablated using laser ablation in the ethanol in the ethanol. In this technique we used a high purity gold target for ablated the NPs and using a tattoo removal Q switching Nd:YAG laser, with a 6 nanosecond pulse duration, 2000 mj energy, 500 laser pulses for ablation and 6 Hz of the frequency, then we investigated of the gold NPs by the structural results as the X-ray diffraction analysis, and the optical analysis. The presented results gives the ablated nanoparticles characteristics, as presented of the results of the XRD, and the UV-vis ablated by laser at different wavelength preparation conditions, where the best preparation condition are at 532 nm better than tha ablated by laser wavelength of 1064 nm.
Green synthesis of reduce graphene oxide by green tea leaves
Authors: Abdulmageed Hamsa A. , Judran Abdulhadi. K. , Noori Farah T. M. 
Published: March 2021

Abstract
Nowadays using green chemical synthesis is more common because it is minimized the side effect of chemical reaction emission. In this study graphene oxide (GO) and reduction it to (rGO) synthesis to explore its advantage in different field. This research present overview of green synthesis of (rGO) using green tea leaves as reducing agents. Besides, it also gives analyzing of (GO) and (rGO) by using X-ray diffraction (XRD), Fourier Transmission Infrared (FTIR) and Ultraviolet-Visible spectroscopy (UV-Vis). X-ray spectra has proven that (GO) and (rGO) were successfully synthesized by illustrating peak at (11.22, e ec i e y images, monolayers with mean grain size (41.7990,) nm respectively for (GO) and (rGO). Moreover, the FTIR showed that the amount of oxygen group reduced in (rGO) while UV-Vis spectra proved the absorption peak of GO (285nm) and rGO (295nm) at different location. Therefore, this green method can reduce rely on the chemical material.
Developing home health care application for patient during the covid-19 pandemic
Authors: Permana A A J , Sindu I G P , Pageh I M 
Published: March 2021

Abstract
The term “Priyayi” or willing to be served in Indonesia as a social context really encourages start-up developers to develop products. Also, Covid-19 pandemic makes people anxious to visit hospitals or “Puskesmas” (Community Health Care Service). The development of home care applications is prospective in Indonesia, especially in Singaraja, Bali. It greatly assists the community to get health services in their homes so that it is safer and more comfortable than queuing for services at hospitals and clinics. This research is descriptive qualitative research. The applications are developed using the Agile Method. The data is obtained through observations, interviews, and previous scientific research and study. Based on the results of interviews, 80% of respondents wanted the development of this application. Furthermore, the result of Alpha testing showed that the system could ran well. The usability Testing Process used the System Usability Scale (SUS) questionnaire with 20 respondents resulted in a “Good” value (65,125) so that this application followed the needs of people who want to get health care at home during the Covid-19 pandemic.
Road extraction in satellite image with fuzzy c-mean
Authors: Melati I G A S , Januhari N N U , Yaputra A 
Published: March 2021

Abstract
Algorithm Fuzzy C-Means is a data grouping technology where the level of data presence in a class or cluster is determined by the degree of membership. The-based image segmentation clustering in this study applied the Fuzzy C Means method to obtain a more optimal cluster center. Preprocessing applied to the test image used in the proposed method was gradient operation. System evaluation was applied following two approaches, namely measuring the value validity cluster. The test results show that the FCM-Means algorithm produced better segmentation. The results of the clustering produced colors on the road. The value of each pixel was limited to the value 0 or the value 1 in the binary image. In this Fuzzy C-Means algorithm, each object / data can be a member of several clusters.
Analysis of e-learning user satisfaction itb stikom bali using end user computing satisfaction (eucs) method
Authors: Putera W A , Candiasa I M 
Published: March 2021

Abstract
The development of internet technology has spurred the emergence of various new applications that support activities in various fields, including in the field of education such as e-learning. ITB STIKOM Bali has its own developed e-learning system. In e-learning, there are several navigation menus such as course information, meeting descriptions, file uploads, discussion activities, and others that are prepared for students as users. This study aims to determine the level of satisfaction of e-learning users. The level of satisfaction was measured using the End User Computing Satisfaction (EUCS) method involving 177 students as respondents who were randomly selected. The data collection method in this study used a questionnaire. From the results of the analysis of the data that has been collected, the following results are obtained: Based on the results of the calculation of the average level of satisfaction, the value is 4.54 on the content variable, the accuracy variable is 4.48, the shape variable is 4.53. on the timeliness variable, the score was 4.5, the user convenience variable scored 4.51, and when combined with the satisfaction level according to Kaplan and Norton, it could be concluded that the level of user satisfaction with e-learning was included in the very satisfied category.
Evaluation of instrument testing of change agents at denpasar high court with stake model
Authors: Suharsana I K , Divayana D G H , Indrawan G 
Published: March 2021

Abstract
Evaluation is important for the improvement of a process or an activity. Evaluation activities are carried out at Denpasar High Court. One of the evaluation activities is determining the agent of change. The determination of the agent of change at Denpasar High Court is carried out through a selection process. This selection process uses 10 criteria. Currently, the process of selecting or determining agents of change at Denpasar High Court is still being carried out manually and some of the criteria are not based on physical data or documents. Accordingly, it is important to evaluate the criteria for determining agents of change. To simplify the evaluation process, this research used a stake evaluation model. The evaluation process uses assistance instrument. The instrument also determines the success of the evaluation process. To produce a good instrument, it is necessary to test the instrument. Therefore, this research conducted an instrument testing in form of a test on the validity and reliability of each question item on the instrument. The purpose of this research was to determine the level of validity and reliability of the evaluation instrument of agents of change at Denpasar High Court by using the stake model. The method used in this research was quantitative approach method. The test tool used was a questionnaire. Respondents of the research were 15 people who were agents of change and evaluators. The analysis technique used to test the validity was product-moment correlation. Additionally, the reliability analysis used Cronbach Alpha. The result of this research was the evaluation instrument of agents of change at Denpasar High Court with the stake model. Based on the result of the validity test, it was found that 21 instrument items were valid. Based on the result of the reliability test, it was found that all instrument items were reliable. Therefore, it can be concluded that this instrument is ready to use as an evaluation tool for agents of change at Denpasar High Court with the stake model.
Indonesian sentiment summarization for lecturer learning evaluation by using textrank algorithm
Authors: Darmawiguna I G M , Pradnyana G A , Jyotisananda I B 
Published: March 2021

Abstract
Learning evaluation is a very important process to assess lecturer performances. Evaluation is carried out at the end of the semester by students. Student can give comments, critics, suggestions related to the subject taught by the lecturers. To analyse student comments, the lecturer can read the entire comments one by one. The main focus in this research was to develop the system that will be applied in summarizing student comments on the implementation of course learning. The algorithm that was used to perform text summarization was the TextRank algorithm. TextRank is a graph-based ranking algorithm (a graph with a ranking model) for processing text from natural or human language documents. We used 100 data sentiments by students to lecturers who teach one course in one semester. It was directly taken from SIAK (academic information system) by using web services. Based on the evaluation of the summaries by the expert, it was found that the textRank algorithm is quite representative in performing summarization for sentiments with the accuracy of 82%.
Double exponential smoothing brown method towards sales forecasting system with a linear and non-stationary data trend
Authors: Dharmawan P A S , Indradewi I G A A D 
Published: March 2021

Abstract
UD Parama Store is a trading company engaged in selling retail goods that sell various types of daily necessities retail. The major problems occurred are the difficulty in predicting the sales due to the maturity level of experience, customer demand changes, and the owner’s limited memory. Therefore, there should be an increase of merchandise stock to prevent any sudden decrease in sales and overcome the stock shortage when there is an increase in sales. In this current research, a sales forecasting web-based system was designed and built to assist the owner in predicting the number of sales in the next period. As a result, decisions can be made in determining the number of goods to be provided. The forecasting method used was double exponential smoothing brown by improving forecasting, averaging (smoothing) the past value of a time coherent data, and decreasing (exponential), which requires one parameter only. It was used to increase and decrease the linear and non-stationary data. The calculation of forecasting accuracy using the MAPE (Mean Absolute Percentage Error) method in forecasting sales of merchandise produces the smallest error rate ranging from 7.99% to 32.42% for 10 different items.
Web-based Buleleng regency agriculture product information system development
Authors: Dewi L J E , Wijaya I N S W , Seputra K A 
Published: March 2021

Abstract
Agriculture is very important for the welfare of the nation. However, accurate and up-to-date agriculture data in the Buleleng regency are difficult to find. This study was aimed at making a developmental design of Web-based Buleleng regency agriculture product information system and implementing it to support the region’s best products-based regional people economy. The development of this system used the Software Development Life Cycle (SDLC) method with Waterfall model that followed five stages of activities, namely (a) requirements definition, (b) system, and software design, (c) implementation and unit testing, (d) integration and testing, and (e) operation and maintenance. The data needed in the system was obtained by working together with the Buleleng regency agricultural office. Later this system will involve some users with different accessing rights, namely field agriculture extension agents who manage product data, the workers of the agriculture office as administrators of the system, the general public, and consumers who probably come from hotels, restaurants, supermarkets, etc that become the markets of the agriculture products in Buleleng regency. Consumers can order the products. However, this system does not handle online payments. It is expected that with this system Buleleng regency will have accurate and up-to-date data related to agriculture products that are available in Buleleng. In addition, this system can be used as a model for other regencies in Bali and other regions in Indonesia. With the availability of this system in the future, the farmers as producers will get good prices for their products and the consumers will get products of good quality at reasonable prices.
Manik angkeran storytelling based on android mobile tap gameplay
Authors: Yusa I M M , Pandawana I D G A , Putra I N A S , Herawan T 
Published: March 2021

Abstract
This research objective was to structure a presentation of a Balinese popular folk tale as an educational strategy through a mobile game with easy-to-play gameplay. This study had 3 (three) main objectives: (1) building the Manik Angkeran story, which is the famous folk tale circulating in Balinese society, Indonesia; (2) realizing the Manik Angkeran game that highlights Balinese characteristics; (3) implementing easy-to-play gameplay. In developing the original story of Manik Angkeran, the strategies carried out were: (1) building a new story with the main character, Manik Angkeran; (2) highlighting Balinese characteristics in character design, game background, and background music in fighting scenes; (3) chosing tap-mode game considering the simplicity and efficiency. The result of this study was Manik Angkeran Game with Tap Game genre based on Android. The game requires players to tap on the screen to move Manik Angkeran, with a mission to defeat the enemy/monster to collect gold coins (Pis Bolong Mas). Later, these coins can be used to buy building materials, which will be used to build dormitories (Pesraman). The test results using the BlackBox Testing method showed that the functionality of the navigation buttons and the entire functions of the game were running well as desired. For the results of testing the game on several different screen resolutions, showed that the display of this game was able to adjust on different screen resolutions and the image display remains sharp. This game was also capable to run on a minimum Android device v.3.0 HoneyComb, until the latest version at this time is v.9.0 Pie. Research disclosure starts with the Introduction, which reveals the background and purpose of the study. Furthermore, the discussion swooped over to the research method used. The process of pre-production, production to post-production was he model or technique used in making games. The results revealed the evaluation of the black box to test the readiness of the system.
Students’s acceptance toward the use of mobile learning in fractions
Authors: Rochmah I N , Hwang W-Y , Priyanto  
Published: March 2021

Abstract
Most of the fifth-grade students have been familiar with mobile technology and commonly use it to play games. Accordingly, the school do not allow fifth-grade students to bring or operate mobile technology while they are at school in order to keep students’ attention on learning. However, during the pandemic COVID-19 condition, the government demands students to learn from home. Thus, one solution is using mobile technology to maintain communication and interaction between students and teachers during teaching and learning activities from home. The present study developed a mobile application, called U-Fraction, to assist students in the mobile learning process. The developed application was associated with authentic learning so that students could have stronger understanding of the real-world problems. Students’ perception toward the mobile learning supported by U-Fraction were measured using TAM with partial least square analysis. The result shows that students tended to use this mobile application for mobile learning. Students also believed that the use of U-Fraction for mobile learning could help their learning process.
Designing augmented reality sibi sign language as a learning media
Authors: Aditama P W , Putra P S U , Yusa I M M , Putra I N T A 
Published: March 2021

Abstract
Sign language is language used by deaf people to exchange information. Indonesia has two sign languages used in its application, namely SIBI and BISINDO. SIBI is an adaptation of the American Sign Language which is currently being applied in a special school (SLB) environment. To provide support in learning SIBI sign language in technological advances, the design of Augmented Reality to introduce the letters SIBI will help in the learning process. The black box test results showed all the features and functions of the application can run well. In observing the response time when scanning markers using the Xiaomi PocoF1 marker on the letters SIBI, it had an average time of 6.05 seconds. Observation of the scan distance of the SIBI letter, the average scan distance of the marker can be scanned at a distance of 5 cm to 50 cm.
Schoology based applied mathematics blended learning model to improve the students’ problem-solving ability
Authors: Darma I K , Karma I G M , Santiana I M A 
Published: March 2021

Abstract
This study aims to determine the feasibility of a model of blended learning applied mathematics using schoology for vocational education using the 4D model development method that includes the four Ds steps, namely Define, Design, Develop, and Disseminate. The research was conducted at the Politeknik Negeri Bali where the data were collected using a validation sheet and student response questionnaire sheet. Data were analyzed descriptively. As a result, the design of applied mathematics blended learning using schoology achieved: feasibility level of 84.91% (feasible), practicality 78.84% (practical), and the compliance was 88.02% (very helpful). This implies that blended learning applied mathematics is very appropriate to be used as a model of learning in vocational education. The design development can be continued to the stage of effectiveness testing, evaluation and dissemination.
Validity testing of blended learning based on android smartphones in computer device maintenance course
Authors: Wijaya I , Sefriani R , Menrisal  
Published: March 2021

Abstract
This study aimed to determine the validity level of blended learning media to support the blended learning process. This was a Research and Development (R&D) using the 4D development model. The model involved four steps, namely: 1) Define, 2) Design, 3) Development, and 4) Assessment. Based on the research that has been done, the average value of the test assessment for Android media to support the learning process through Blended Learning is 94.28% which level of validity can be interpreted as very valid. Based on the assessment and input from material experts, Android application software experts and multimedia experts, it can be concluded that the blended learning media is suitable for learning the maintenance of computer devices in the Informatics Engineering Education Department.