bluuebunny/crossref_metadata_2025 huggingface dataset:
Analisis karakteristik aerodinamika telescopic wing dengan konfigurasi sayap flying wing dan glider menggunakan metode pendekatan simulasi CFD
Authors: Azmi Azhim Asyratul , Hariyanto Satriawan Dini , Hidayat Arif
Published: August 2021

A telescopic wing is a shape-changing method of the aircraft wing known as the morphing wing system. Wingspan extends capability on telescopic wing increasing the aspect ratio to get a high lift force. The telescopic wing on a flying wing configuration as an external wing and glider wing as an internal wing can be used to increase the coefficient lift (CL) when carrying out special missions. The aerodynamic characteristics using the Computational Fluid Dynamic (CFD) simulation approach is presented. For the 40% internal wingspan, the highest CL increment was 12.9% at a 10o angle of attack. For the 50% internal wingspan, the highest CL increment was 14.9% at a 10o angle of attack. on the 40% internal wing, the highest coefficient drag (CD) increment was 4.7%, and the largest CD increment on 50% internal was 9.5% at the angle of attack of 20o. The pressure distribution along the internal wingspan was uneven from an angle of attack of 15o due to the wing tip vortices of the external wing. Streamline pattern shown a bubble separation from the leading edge at an internal wing root by external wing tip vortices.Keywords: Morphing wing, telescopic wing, flying wing, glider
Karakterisasi hasil quenching besi cor pada manufaktur roda gigi mesin tenun
Authors: Wisnujati Andika , Yusuf Mirza , Fatimah Dhini
Published: August 2021

The development of science and technology today has a significant influence on technological development and advances in the industrial world. Casting is a product manufacturing technique in which the metal is melted in a furnace and then poured into a mold cavity that is similar to the original form of the cast product to be made. One of the results or products produced from the casting method in this study is a weaving gear component. The gear serves as a short distance power transmission based on the rotation ratio from the main shaft to the drive shaft. This study purpose to determine the effect of the quenching process with oil cooling media on cast iron material. The testing results reveal that the composition test results in 3.18% carbon content, such that the components in this gear manufacturing are used in cast iron, which essentially has the characteristics of being heat-resistant and brittle. It is also necessary to use it as a way of producing materials feeling the continuous impact. The brittling effect of quenching oil heat treatment improves the quality of the materials. It is observed from the research findings that use the Vickers hardness test that the quenching heat treatment shows a substantial difference in score. The highest Vickers hardness test score with quenching oil materials achieving a score of 427.84 VHN is seen. The test exhibits the maximum value of 378.18 VHN in raw materials.Keywords: Cast iron, quenching, chemical composition, Vickers hardness.
Pembuatan prototipe Aluminium cylinder head engine dengan metode rapid prototyping dan investment casting
Authors: Masy'ari Masy'ari , Prasetiyo Ari Dwi , Karyadi Edi
Published: August 2021

The manufacturing industry is one of the sectors that consistently continues to provide the largest national economic growth contribution to reach the target economic growth of 5.3% in 2020. In the 4.0 industry era, the manufacturing industry sector in Indonesia starts to adopt the newest digital technology like artificial intelligence, machine learning, and the internet of things, and additive manufacturing. This research aimed to develop a manufactured product in form of Aluminium cylinder head engine prototype with digital rapid prototyping and Aluminium investment casting. To reach the research goal, the research started from theoretical study and data collection. Next, the cylinder head engine is modelled in CAD (computer-aided design software and printed in 3D printer with polyvinyl butyral and polylactic acid. This 3D printed cylinder head is going to use as moulding pattern. Hereafter, the cylinder head engine is assembled with gating system and coated with a mix of cement plaster, silica sand, and kaolin soil. After the mould is dry, the mould will be burned until the 3D printed pattern is vaporized. The final step is pouring the molten Aluminium at 800°C temperature into the mould. The results showed that the casting process with a cylindrical gating system was perfectly formed, especially for the fins part. However, for the smaller fins, there were still defects in form of lumps. The mix of silica sand, gypsum cement and kaolin soil can create a strong mould. The difference in pattern material does not have a significant effect on the investment casting mould-making process.Keywords: Rapid prototyping, cylinder head engine, investment casting.
Prototipe double acting cylinder transparan sebagai media pembelajaran sistem hidrolik
Authors: Pratomo Tri , Yani Rina Dwi , Effendi Maryono , Iswanda Dovian , Naufal Alban , Andriani Devi
Published: August 2021

Double acting cylinders in its application are widely used in the industry and are often applied in maintenance or repair instruments. The purpose of this research is to design and make a double acting cylinder so that the movement of the hydraulic cylinder its fluid flow can be seen clearly and easily implemented in the movement process, especially in the learning process. The research employs experimental method by directly design a transparent double acting cylinder. This transparent double acting cylinder will later be applied to the hydraulic trainer. The steps taken were determining the transparent material, making material samples for tensile tests, designing and making hydraulic cylinders, conducting hydraulic cylinder tests using Autodesk Inventor 2019. From the test results of hydraulic cylinders made from acrylic using Autodesk Inventor 2019, the minimum pressure that occurs is 1,456 MPa and the maximum pressure that occurs is 6,573 MPa, in operation, the recommended pressure 1,456 to 5,551 MPa, double acting transparent cylinder which has a transparent hydraulic cylinder length of 250 mm, thickness 11.4 mm, hydraulic cylinder inner diameter 32 mm, hydraulic cylinder locking uses 4 bolts with size M8, design pressure 23 kg/cm².Keywords: hydraulic system, double acting cylinder, transparent.
Pengaruh pH larutan elektrolit terhadap kuat lekat dan ketebalan hasil elektroplating bahan baja karbon rendah
Authors: Asroni Asroni , Handono Sulis Dri , Wahyudi Tri Cahyo , Saputra Yogi
Published: August 2021

Electroplating is a process of coating a solid material with a metal layer using an electric current through an electrolyte solution. The purpose of this study was to obtain the best solution pH for the thickness and adhesive strength results of electroplating, as well as the method used in various electrolyte solutions, namely pH 1.7, pH 3, pH 5, pH 7 and pH 9. The anode was used Nickel while the cathode uses ST41 Steel with dimensions of 70 mm x 50 mm x 10 mm. The distance between the anode and cathode is 10 cm and a DC current voltage of 5.5 volts with an immersion time of 20 minutes. The best coating were obtained at a variation of pH 1.7 with a result of 0.0322 mm and adhesive strength at a variation of pH 5 with a result of 26.53 MPa and pH 7 of 24.25 MPa.Keywords: Electroplating, pH variation, adhesion strength, thickness, Steel ST41, Nickel.
Desain dan analisis pengaruh parameter PI dan variasi kecepatan pada respon sistem kontrol arah hadap prototype kendaraan listrik
Authors: Distara Afif Caesar , Rohman Fatkhur
Published: August 2021

Electric vehicles are alternative vehicles that carry energy efficient. At this time the dominant vehicle uses ordinary wheels so that it will become an obstacle in the maneuver function that requires movement in various directions. With mechanum wheels the vehicle can move in various directions by adjusting the direction of rotation of each wheel. The problem is choosing the right control system for the control system needed by the vehicle. The purpose of this study is to determine and analyze the effect of variations in the value of PI (Proportional Integral) and speed of the vehicle to the stability response of the system to control the direction of prototype electric vehicles. This study method is an experiment that is by giving a treatment, then evaluating the effects caused by the research object. The results of this study can be concluded that the variation of PI constant values and speed variations have an effect on the stability parameters of the system, namely rise time, settling time, overshot, and steady state error. To get the best system stability response results can use the constant value PI Kp = 2; and Ki = 17; where the stability response of the system for direction control at each speed condition has a fairly good value with a fast rise time, fast settling time, small overshot and a small error steady state compared to other PI constant values in this study.Keywords: mechanum wheel, PI control, direction, prototype, system stability
Pengaruh waktu celup dan tegangan listrik terhadap hasil elektroplating bahan baja karbon rendah
Authors: Asroni Asroni , Rajabiah Nurlaila , Fahlevi Dien
Published: August 2021

Electroplating is a process of electro precipitation a metal layer on an electrode which aims to form a surface with different properties or dimensions from the base metal. The metal that is coated is aluminum because it is frequently used as industrial equipment, motor vehicle parts and so on. Low carbon steel is the steel most widely used as a shipbuilding material. As a mode of transportation that operates in corrosive marine environments, a coating protection is needed so that corrosion can be minimized. This study aims to determine the effect of immersion time and electric voltage on the optimal thickness of the electroplating results. Determine the effect of immersion time and electric voltage on the adhesive strength resulting from electroplating. Anode Material coated with ST41 Steel Plate with dimensions of 70 x 25 x 20 mm. while the cathode uses nickel (Ni) with dimensions of 10 x 20 x 20 mm. Cathode to anode distance of 10cm. Dip time 10, 15 and 20 minutes, adhesion testing using PosiTest AT-M Adhesion Tester. The conclusion obtained from this research is that the optimal thickness of the layer is at a voltage variation of 4 volts and immersion time used for 20 minutes with the results obtained of 0.093 mm. While the adhesive strength of the layers from electroplating research was found in the variation of the voltage of 4 volts and the immersion time used for 20 minutes with the results obtained at 21.46 MPa.Keywords: Electroplating, Nickel, anode, cathode, low carbon steel.
Pengaruh jarak nozzle penyemprot terhadap kemampukerasan baja komersil dengan metode jominy test
Authors: Yusuf Yusuf , Ruchiyat Asep , Anhar Muh
Published: August 2021

Steel is the material most widely used in the industry. To avoid wear and tear on steel, it is necessary to do heat treatment to improve the mechanical properties of the steel according to its application in the field. The increase in hardenability in metals can be determined by doing a hardenability test, namely the Jominy test method. The Jominy test is a method to determine the hardness value of metal using ASTM standards. This research was conducted with varying the distance of the nozzle of the sprayer to the lower end of the specimen, namely 10 mm, 12.5 mm, and 14 mm with a long spraying time of 15 minutes. The heat treatment process at temperature of 780oC and 90 minutes holding time. The averagehardness value of specimen number one (10 mm spraying distance) is 45.43 kgf, specimen number two (12.5 mm spraying distance) is 45.68 kgf, and specimen number three (14 mm spraying distance) is 44.31 kgf. The highest hardness value was specimen number two, there was an increase of 1.87 kgf (4.02%), according to ASTM standards where the spraying distance was 12.5 mm.Keywords: Steel, spraying distance, Jominy test.
Deteksi kavitasi menggunakan linear discriminant analysis pada pompa sentrifugal
Authors: Kamiel Berli Paripurna , Ahmad Yusuf , Krisdiyanto Krisdiyanto
Published: August 2021

Cavitation is a phenomenon that often occurs in the centrifugal pumps. The impact of cavitation is a decrease in pump performance which will affect the ongoing production process in the industries. It is important to have a method to detect the phenomenon of cavitation early. The vibration signal is a parameter that is often used in detecting cavitation or other faulty components. One of the methods is based on the pattern recognition i.e. machine learning. Linear Discriminant Analysis (LDA) is a machine learning algorithm that has the advantage of reducing the parameters used into low dimensions without reducing the accuracy of their classification. The study proposes LDA to classify normal conditions, initial cavitation, intermediate cavitation and severe cavitation. The recording of the vibration signal is taken using the an accelerometer mounted on the inlet of the centrifugal pump. The vibration signal is then extracted using 10 statistic parameters of time domain as the LDA feature selection, namely mean, RMS, standard deviation, kurtosis, skewness, crest factor, clearance factor, shape factor, variance and peak value. The results shows that the LDA classifier can detect and classify cavitation conditions with an accuracy rate of 98.8% on training and 99.6% on testing. The shape factor, kurtosis, skewness and RMS parameters are a combination of parameters that have a large contribution to the classifier to detect and classify cavitation conditions.Keywords: Linear Discriminant Analysis (LDA), cavitation, centrifugal pump, statistical parameter
Enhanced Visualization of Customized Manufacturing Data
Authors: Kurasova Olga , Marcinkevičius Virginijus , Mikulskienė Birutė
Published: August 2021

Enhanced Visualization of Customized Manufacturing Data Olga Kurasova Mykolas Romeris University Ateities str. 20 LT-08303 Vilnius, Lithuaniaolga.kurasova@mif.vu.lt Virginijus Marcinkevičius Mykolas Romeris University Ateities str. 20 LT-08303 Vilnius, Lithuaniavirginijus.marcinkevicius@mif.vu.lt Birutė MikulskienėMykolas Romeris University Ateities str. 20 LT-08303 Vilnius, Lithuaniabirute.mikulskiene@mruni.eu ABSTRACTRecently, customized manufacturing is gaining much momentum. Consumers do not want mass-produced products but are looking for unique and exclusive ones. It is especially evident in the furniture industry. As it is necessary to set an individual price for each individually manufactured product, companies face the need to quickly estimate a preliminary cost and price as soon as an order is received. The task of estimating costs as precise and timely as possible has become critical in customized manufacturing. The cost estimation problem can be solved as a prediction problem using various machine learning (ML) techniques. In order to obtain more accurate price prediction, it is necessary to delve deeper into the data. Data visualization methods are excellent for this purpose. Moreover, it is necessary to consider that the managers who set the price of the product are not ML experts. Thus, data visualization methods should be integrated into the decision support system. On the one hand, these methods should be simple, easily understandable and interpretable. On the other hand, the methods should include more sophisticated approaches that allowed reveal hidden data structure. Here, dimensionality-reduction methods can be employed. In this paper, we propose a data visualization process that can be useful for data analysis in customized furniture manufacturing to get to know the data better, allowing us to develop enhanced price prediction models.
Lightweight Surface and Volume Mesh Sampling Application for Particle-based Simulations
Authors: Sommer Alexander , Schwanecke Ulrich
Published: August 2021

We present an easy-to-use and lightweight surface and volume mesh sampling standalone application tailored for the needs ofparticle-based simulation. We describe the surface and volume sampling algorithms used in LEAVENin a beginner-friendlyfashion. Furthermore, we describe a novel method of generating random volume samples that satisfy blue noise criteria by mod-ifying a surface sampling algorithm. We aim to lower one entry barrier for starting with particle-based simulations while stillpose a benefit to advanced users. The goal is to provide a useful tool to the community and lowering the need for heavyweightthird-party applications, especially for starters.
Updating 3D Planning Data based on Detected Differences between Real and Planning Data of Building Interiors
Authors: Dietze Andreas , Grimm Paul , Jung Yvonne
Published: August 2021

This paper presents a system to determine differences between 3D reconstructed interiors and their corresponding3D planning data with the aim of correcting identified differences and updating the 3D planning data based onthese deviations. Therefore, a point-based comparison algorithm was developed with which deviations can berecognized regardless of the topology of the data used. Usually, resolution and topology of a 3D reconstruction donot match the CAD data. Here, our solution overcomes this problem by segmenting and extracting objects relevantfor comparison (e.g., doors, windows) from the reconstruction and planning data separately with a subsequentanalysis of the proximity of these objects to connected walls within the corresponding data set. Starting from theconnection points of a segmented object to its walls, adjacent spatial data is located for a correction of detecteddifferences to update the 3D planning data. The quality of the result of the developed process is shown in differentexamples localizing doors and windows to find deviations. In addition, detected differences between the planningand the measurement data are visualized and compared with the ground truth state of the building interior.
Comparison of 2D vs. 3D Unet Organ Segmentation in abdominal 3D CT images
Authors: Zettler Nico , Mastmeyer Andre
Published: August 2021

A two-step concept for 3D segmentation on 5 abdominal organs inside volumetric CT images is presented. Firsteach relevant organ’s volume of interest is extracted as bounding box. The extracted volume acts as input for asecond stage, wherein two compared U-Nets with different architectural dimensions re-construct an organ segmen-tation as label mask. In this work, we focus on comparing 2D U-Nets vs. 3D U-Net counterparts. Our initial resultsindicate Dice improvements of about 6% at maximum. In this study to our surprise, liver and kidneys for instancewere tackled significantly better using the faster and GPU-memory saving 2D U-Nets. For other abdominal keyorgans, there were no significant differences, but we observe highly significant advantages for the 2D U-Net interms of GPU computational efforts for all organs under study.
A Deep CNN Model for Skin Cancer Detection and Classification
Authors: Junayed Masum Shah , Anjum Nipa , Sakib Abu Noman , Islam Baharul
Published: August 2021

Skin cancer is one of the most dangerous types of cancers that affect millions of people every year. The detection ofskin cancer in the early stages is an expensive and challenging process. In recent studies, machine learning-basedmethods help dermatologists in classifying medical images. This paper proposes a deep learning-based modelto detect and classify skin cancer using the concept of deep Convolution Neural Network (CNN). Initially, wecollected a dataset that includes four skin cancer image data before applying them in augmentation techniques toincrease the accumulated dataset size. Then, we designed a deep CNN model to train our dataset. On the test data,our model receives 95.98% accuracy that exceeds the two pre-train models, GoogleNet by 1.76% and MobileNetby 1.12%, respectively. The proposed deep CNN model also beats other contemporaneous models while beingcomputationally comparable.
Word Recognition using Embedded Prototype Subspace Classifiers on a New Imbalanced Dataset
Authors: Hast Anders , Vast Ekta
Published: August 2021

This paper presents an approach towards word recognition based on embedded prototype subspace classification.The purpose of this paper is three-fold. Firstly, a new dataset for word recognition is presented, which is extractedfrom the Esposalles database consisting of the Barcelona cathedral marriage records. Secondly, different clusteringtechniques are evaluated for Embedded Prototype Subspace Classifiers. The dataset, containing 30 different classesof words is heavily imbalanced, and some word classes are very similar, which renders the classification task ratherchallenging. For ease of use, no stratified sampling is done in advance, and the impact of different data splits isevaluated for different clustering techniques. It will be demonstrated that the original clustering technique based onscaling the bandwidth has to be adjusted for this new dataset. Thirdly, an algorithm is therefore proposed that findskclusters, striving to obtain a certain amount of feature points in each cluster, rather than finding some clustersbased on scaling the Silverman’s rule of thumb. Furthermore, Self Organising Maps are also evaluated as both aclustering and embedding technique.
Levels of Knowledge in
Nursing Students on Hemodynamic Monitoring
Authors: Brezić Josip , Kurtović Biljana , Friganović Adriano
Published: August 2021

Introduction. Hemodynamic monitoring is of great importance because it covers all vital organic systems and their functioning, and any error in the interpretation of the monitored parameters can lead to a drastic deterioration of the patient’s condition and cause death.
Aim. The aim of this study was to determine the levels of knowledge about hemodynamic monitoring of full-time and part-time students of the first, second, and third year of the undergraduate study of nursing at the University of Applied Health Sciences in Zagreb.
Methods. A cross sectional study was conducted. The survey subjects were students at the University of Applied Health Sciences in Zagreb (N=280) in the period between December 2020 and February 2021. For the purposes of the study, the authors created a questionnaire that students filled in using an online platform, and the results of the questionnaire were anonymous.
Results. The research found that most students have an adequate level of knowledge in the field of hemodynamic monitoring. By determining differences in knowledge of part-time and full-time nursing students, it was observed that students with work experience showed statistically significantly better results (p<0.05).
Conclusion. The conducted study showed an adequate level of knowledge of nursing studies, since a high number of students, outside of their faculty obligations, have not been in contact with hemodynamic monitoring. The specificity and complexity of work in the intensive care unit comes from a particularly vulnerable population of patients who require maximum care, which is why nurses need continuous education, skill improvement, and training regarding new monitoring methods.
Time Analysis in Emergency
Medical Service Reporting Unit
Authors: Ruklić Marija , Friganović Adriano
Published: August 2021

Aim. The aim of this paper was to determine whether there are any differences in the time of mobilisation and response time of the emergency medical service (EMS) team with respect to the location of the emergency call.
Methods. The data for this paper was collected and analysed in detail using the program “e-hitna” (“e-emergency”). The sample consists of all calls received in the period between 1 January and 31 December 2019 in the Medical Reporting Unit of the Department of Emergency Medicine of Zagreb County (DEMZC; Zavod za hitnu medicinu zagrebačke županije). This paper presents the number, category, place of intervention, time of mobilisation of the emergency medical service team, and the response time of the emergency services team to emergency calls designated as priority 1 (A).
Results. A total of 47,060 calls were recorded in the “e-hitna” system. We found that out of the total number of calls received, 49% (23,235) were related to emergency interventions. In 38% (8,841) of calls, the medical dispatcher opted for priority 1 (A). According to the place of emergency, 53% (4,691) of priority 1 (A) cases take place in the apartment, while 46% (4,071) occur in a public place. The average mobilisation time of an EMS team for priority 1 (A) cases for apartments is 1.87 ± 1.27, while for public places it is 1.92 ± 0.78 min. (Mann Whitney U test, p<0.001). The average response time of an EMS team for priority 1 (A) cases for apartments is 11.02 ± 4.27, and for public places it is 6.57 ± 3.78 min. The response time was on average much shorter for calls related to emergencies in public places (Mann Whitney U test, p<0,001).
Conclusion. The collected data showed that the Department of Emergency Medicine of the Zagreb County effectively aligns their working processes as well as resources with the needs of the population regarding emergency medical care. Creativity, imagination, and constant time analysis are the determinants of the work of a medical dispatcher.
The Effect of the Internal Control System Effectiveness and the Quality of Financial Reporting and Its Impact on Fraud Prevention of Bandung Regency
Authors: Yasmin Yasmin , Winarningsih Srihadi , Mulyanti Sri
Published: August 2021

The corruption has emerged as the main topic of discussion in many countries and fraud prevention becomes important as well. The 2018 Annual Report of the Corruption Eradication Commission (KPK) revealed that in general the KPK's enforcement action over the past 10 years showed a significant increase. This was also confirmed by President Jokowi that one of the big problems of Indonesia is related to Corruption This study is aimed to discover fraud prevention from the perspective of financial statements through the internal control system effectiveness and good corporate governance implementation.This study uses an explanatory research approach to analyze how one variable affects other variables through hypothesis testing. The data was collected using a questionnaire which distributed and filled by all regional authorities in Bandung Regency and then analyzed through path analysis using SPSS data processing tools. The results indicate that the effectiveness of internal control systems along with the good corporate governance implementation and the quality of financial statements have a positive effect on fraud prevention and partially the effectiveness variable of the internal control system has no significant effect, while the other two variables have a significant effect.
Organizational Capacity of Cianjur Main Rice Seeds Development
Authors: Iqbal Mohammad , Mirna Ryta , Susanti Elisa
Published: August 2021

The increasing number of people causes the need for food to increase so that the need for seed development so that food availability can be fulfilled this can be seen through the organizational capacity, especially in Cianjur, West Java, where this location is one of the areas in Indonesia that is used in efforts to develop parental rice seeds. The purpose of this research was to determine and analyze how the organizational capacity of developing Cianjur rice seeds was. The theory used in this research is Horton's theory of organizational capacity. This research uses qualitative research methods and is described descriptively. The results showed that the organizational capacity of the Cianjur Parental rice seed development organization still had problems such as limited resources, technology and budget, causing the program to be implemented could not be used optimally.
direito fundamental à inclusão socioeconômica a partir da alteridade
Authors: May Yduan de Oliveira , Possamai Angélica Pereira
Published: August 2021

O presente artigo desenvolveu a problemática da inclusão socioeconômica no Brasil. Primeiramente, apresentou-se o direito à inclusão socioeconômica como direito fundamental, direito em que a vertente do social e da econômica estão intrinsecamente ligados em prol da dignidade humana. Posteriormente, comentou-se sobre os índices socioeconômicos, a fim de demonstrar que se está frente a uma demanda social que precisa estar presente na agenda governamental para o pleno desenvolvimento nacional; e para tal fim, apresenta-se a filosofia da Alteridade como um fundamento que pode vir a transformar este cenário, tanto de desigualdade social, quanto de desprezo e ineficiência estatal. Para este fim adotou-se o método dedutivo e monográfico, por meio da técnica de pesquisa em documentação indireta em pesquisa bibliográfica de fontes secundárias como livros, jornais, com objetivo descritivo e exploratório.
Palavras-chave: Direito Fundamental. Direito à Inclusão Socioeconômica. Alteridade.
TISSUE CULTURE MULTIPLICATION OF Paphiopedilum insigne DEPENDING ON THE MEDIUM TYPE, GROWTH REGULATORS AND NATURAL SUPPLEMENTS
Authors: Poniewozik Monika , Szot Paweł , Parzymies Marzena
Published: August 2021

Paphiopedilum is an ornamental orchid used mainly for interior decoration. As the division of plants is uneconomical, a fast method of propagation is needed. The aim of this study was to evaluate the influence of medium type (MS or VW), growth regulators, i.e. BA, KIN, TDZ used separately or in combinations and natural additives, i.e. coconut water, banana pulp, casein hydrolysate, on Paphiopedilum insigne plantlets grown in vitro. It was found out that BA in concentration of 0.5 mg·dm–3 allowed to obtain the highest multiplication rate (2.92), however the use of KIN in concentration of 1 mg·dm–3 resulted in formation of bigger and higher quality plantlets, It is possible to replace cytokinins with other biologically active substance, such as banana pulp. The 1/2 MS medium might be used for Paphiopedilum insigne tissue culture, as there was no difference in terms of multiplication rate and the obtained plantlets were of better quality, especially that it is cheaper and easier to prepare.
EXTENDING VASE LIFE OF CUT Strelitzia reginae Aiton FLOWERS BY COBALT CHLORIDE, CERIUM NITRATE, SILVER NANOPARTICLES AND NANOSIL
Authors: Azarhoosh Jahangir , Hashemabadi Davood , Asadpour Leila , Kaviani Behzad
Published: August 2021

Cut flowers of Strelitzia reginae Aiton (Strelitziaceae) generally have a short vase life. Vascular blockage is a major reason for this. In this paper, we evaluated the effects of pulse treatment with disinfectants including cobalt chloride (CoCl2), cerium nitrate (Ce(NO3)3), silver nanoparticles (SNP) and Nanosil on the vase life and physiological characteristics of cut S. reginae flowers stems. Cut flowers kept in the vase solution containing these disinfectants showed significant increase in solution uptake, the content of total protein and pigments of petals, the activities of antioxidantive active enzymes superoxide dismutase (SOD) and ascorbate peroxidase (APX). Also, the number of stem-end bacteria and malondialdehyde (MDA) content in cut flowers were decreased as compared to control. Based on obtained results, we introduce Ce(NO3)3 as the most effective treatment to extend the vase life of cut S. reginae flowers. More so with the concentration of 300 µM which induced the maximum solution uptake and SOD and APX activities that resulted in the longest vase life. Findings of the present study suggested that Ce(NO3)3 prolonged postharvest longevity of S. reginae by increasing the solution uptake and SOD and APX activity and decreasing the MDA content. The use of Ce(NO3)3 reduces the use of chemicals and make saving in costs. The highest bacterial population of micro-organisms on cut stem ends were Escherichia coli, Bacillus, Staphylococcus and Streptococcus. Cerium nitrate had the strongest effect on reduction of these bacterial population and yeast.
PERBANDINGAN HASIL DIAGNOSTIK MISKONSEPSI MENGGUNAKAN THREETIER DAN FOURTIER DIAGNOSTIC TEST PADA MATERI GERAK LURUS
Authors: Nurulwati Nurulwati , Rahmadani Ayu
Published: August 2021

Penelitian dengan pendekatan kualitatif ini bertujuan untuk mengetahui perbandingan hasil miskonsepsi siswa dengan menggunakan three-tier diagnostic test dan four-tier diagnostic test pada materi gerak lurus di MAN Model Banda Aceh. Subjek penelitian ini adalah siswa kelas X MIA MAN Model Banda Aceh yang berjumlah 118 responden. Pengumpulan data diperoleh dengan tes diagnostik miskonsepsi. Pengolahan data menggunakan CRI (Certainty Respons Index) dan persentase. Hasil penelitian menunjukkan bahwa persentase instrumen three-tier diagnostic test sebesar 45% dan instrumen four-tier diagnostic test sebesar 31% sehingga perbandingan antara three-tier diagnostic test dan four-tier diagnostic test yaitu 3:2, artinya three-tier diagnostic test lebih banyak mendiagnostik miskonsepsi dibandingkan four-tier diagnostic test.
PENGEMBANGAN PERANGKAT PENGAJARAN MIKRO BERBASIS LESSON STUDY UNTUK MENINGKATKAN PEDAGOGICAL CONTENT KNOWLEDGE MAHASISWA CALON GURU FISIKA
Authors: Safriana Safriana , Marina Marina
Published: August 2021

Kemampuan PCK merupakan elemen penting dalam menentukan keberhasilan seorang guru dalam mengajar dan menentukan pengajaran yang efektif di kelas.Melalui pengajaran mikro diharapkan mahasiswa mampu mengembangkan kemampuan PCK dengan baik.Namun, berdasarkan hasil observasi memperlihatkan bahwa kemampuan PCK mahasiswa masih belum mencapai standar yang diharapkan. Hal tersebut dikarenakan dalam pengajaran mikro selama ini masih sangat monoton, mahasiswa hanya menyimak dan hanya beberapa mahasiswa saja yang melakukan bimbingan dengan dosen tentang RPP, silabus dan media yang akan digunakan. Tujuan penelitian ini adalah mengembangkan perangkat pengajaran mikro berbasis lesson study dan menerapkannya untuk meningkatkan kemampuan PCK mahasiswa calon guru pada program studi pendidikan fisika FKIP Unimal. Penelitian ini merupakan penelitian pengembangan dengan pendekatan design research. Kegiatan awal dalam penelitian pengembangan ini adalah penyusunan perangkat perkuliahan dan instrumen penelitian kemudian diuji dan direvisi.Subjek penelitian adalah mahasiswa program studi pendidikan fisika yang mendaftarkan mata kuliah pengajaran mikro pada semester VI tahun ajaran 2018/2019.Hasil penelitian menunjukkan bahwa peningkatan pada setiap komponen PCK terjadi setelah pada siklus kedua, yaitukomponen pengetahuan pengajaran, pengetahuan siswa dan pengetahuan materi.Secara keseluruhan komponen pedagogical content knowledge setiap mahasiswa calon guru pada prodi pendidikan fisika FKIP Universitas Malikussaleh meningkat signifikan melebihi 50% pada level 2 atau level tertinggi dengan pembelajaran microteaching berbasis lesson study. Oleh karena itu, pada siklus kedua tidak dilakukan revisi lagi dan dianggap draft perangkat perkuliahan pada siklus kedua sudah mencapai tujuan dari penelitian ini. Perangkat perkuliahan yang telah dihasilkan dalam penelitian ini adalah Rencana Pembelajaran Semester (RPS) dan Buku ajar microteaching berbasis Lesson Study.
Refleksi Diri dan Pengetahuan Pedagogi Konten Guru Biologi SMP melalui Analisis Rekaman Video Pembelajaran
Authors: Nugraha Ikmanda , Widodo Ari , Riandi Riandi
Published: August 2021

Kegiatan refleksi diri dapat membantu dan memfasilitasi guru untuk meningkatkan kualitas kegiatan pembelajaran.  Selain itu, masukan yang diperoleh oleh guru selama melakukan refleksi diri dapat meningkatkan pengetahuan pedagogi konten guru. Tujuan penelitian ini adalah untuk menguji penggunaan rekaman video sebagai alat efektif praktik reflektif untuk guru. Subjek penelitian terdiri dari empat guru biologi yang telah terlibat dalam kegiatan lesson study di Kabupaten Sumedang, Jawa Barat, Indonesia. Subjek penelitian dipilih berdasarkan kesamaan materi pembelajaran yang didokumentasikan pada kegiatan open lesson, yaitu pada materi sistem pernapasan manusia. Pada penelitian ini, subjek penelitian terlibat dalam dua kegiatan. Pertama, para peserta sebagai subjek penelitian melakukan analisis refleksi diri dari video pembelajaran mereka sendiri. Kedua, para peserta melakukan analisis refleksi diri menggunakan video pembelajaran dari guru lain. Data dianalisis dengan kategorisasi jawaban refleksi diri kemudian diikuti dengan kegiatan wawancara. Hasil wawancara kemudian ditranskrip untuk klarifikasi dengan hasil jawaban refleksi diri. Hasil penelitian menunjukkan bahwa melakukan analisis diri dengan menggunakan rekaman video menjadikan para guru menyadari kelebihan dan kekurangan sesi pembelajaran yang mereka lakukan dan memberikan ide-ide baru untuk perbaikan di masa mendatang.
Pengembangan Petunjuk Praktikum Berorientasi Pemecahan Masalah sebagai Sarana Berlatih Keterampilan Proses dan Hasil Belajar Mahasiswa IPA Universitas Wiraraja
Authors: Fajarianingtyas Dyah Ayu , Hidayat Jefri Nur
Published: August 2021

Presentation of basic Biology courses integrated between theory and practice, in this case the skills of process and learning outcomes determined in their entirety which can be done in classrooms and labs assisted by practical guide. The research objectives (1) to produce a valid practical guide;(2) differences process skills;(3) improved learning outcomes and(4) respon. This research refers to the 4-D model of Thiagarajan, Semmel Semmel (1974).consists of 4 stages: Define, Design, Develope, and Disseminate. The research subjects used Basic students in the 2019-2020 academic year. At Wiraraja University. Instrument: (1) validation sheets, (2) observation sheets, (3) test sheets. and (4) respons. Data analysis techniques (1) validation data compiled from the score sheet given to expert validators and then averaged on each aspect and used as a percentage form; (2) process skill data using Wilcoxon test; (3) learning outcomes analyzed by N-gain score; and (4) responses analyzed from the average of each indicator and a percentage. Results (1) practical guide valid at 94% (good category); (2) there differences in process skills a significance value of 0,000; (3) there was an increase in learning outcomes show N-gain 0.74 (high criteria); and (4) respons 83% (good criteria)
Kajian Integrasi Nilai-Nilai Karakter Islami Peserta Didik dalam Materi Hidrokarbon di Sekolah Menegah Kejuruan
Authors: Ningrum Lis Setiyo , Haryani Sri , Supardi Kasmadi Imam
Published: August 2021

The inculcation of Islamic character values for students is an important thing to be taught to students. One way of planting is to integrate learning material with the values of Islamic characters of students. This research was carried out through exploring the values of Islamic characters in hydrocarbon material taught in vocational high schools. The purpose of this study is to integrate the values of Islamic characters that are reinforced in the hydrocarbon material in schools. This research is a literature study with qualitative descriptive methods using content analysis techniques, analysis with a philosophical approach, analysis with triadic models, and analysis with confirmation models. The results obtained in this study are the study of the integration of hydrocarbon material chemistry lessons and Islamic character values that can be taught to intermediate level students. The results of the integration are as follows (1) The conversion of a less useful item into a more useful item, (2) Preserving nature as the human task as a Khalifah on earth, (3) Utilizing one of the reactions that occur in hydrocarbon compounds in daily life, (4) Utilizing petroleum as an example of a hydrocarbon product that is very beneficial to humans, (5) The benefits of carbon atoms in the carbon cycle, (6) The benefits of hydrocarbons in photosynthesis to increase our gratitude to Allah SWT, (7 ) The benefits of the special carbon atom in the concept of pairing in life, and (8) Grateful for the greatness of God who has created everything in nature
Students’ Conceptions of Learning Using Animations
Authors: Awang Morsid Nursamiha , Salleh Sallimah M. , Shahrill Masitah
Published: August 2021

This study explored the integration of animations in lessons designed using the Technological, Pedagogical, Content Knowledge (TPACK) framework to enhance students’ conceptual understanding in the processes of diffusion and osmosis. The study was conducted in a secondary school involving 22 Year 12 students. Data was collected using the Osmosis and Diffusion Conceptual Assessment (ODCA), which is a two-tier diagnostic test administered before and after the lessons. The lessons were designed using an action research cycle, integrated with the TPACK matrix. There were four cycles to address the students’ knowledge dimension, which scaffolds from lower order thinking to higher order thinking (declarative, procedural, schematic and strategic). The paired sample t-test was used to analyse the data and the findings revealed significant differences in the students’ conceptual understanding after the animation-integrated lessons were carried out. The intervention was successful as proven from the large effect size, together with the increased frequency of students having selected the correct responses in the ODCA.
Pengembangan Media Video Berbasis Powtoon pada Mata Pelajaran IPA di Kelas V
Authors: Wulandari Yani , Ruhiat Yayat , Nulhakim Lukman
Published: August 2021

The media cannot be separated from the learning process. The use of learning media that is not interesting and varied makes students bored. This research was conducted to produce learning media products in the form of based video animation of powtoon. To achieve these objectives used to Research and Development (RD) method. The development of instructional media focuses on Natural Sciences (IPA) subjects for the fifth-grade of primary schools. To find out the coherence between media and material, validity test have been conducted by media experts and material experts. The results of product validity by the two experts have obtained a very decent category. From the media, expert obtained a value of 89.8% and material experts 88.7%. Next, to find out the effectiveness of the media on the subject matter, a trial was conducted at SDIT. The results of a limited trial to learners obtained a very decent category with 96.36% and an evaluation by the educator of 91.1%. The results of the analysis by both experts and have been tested on students and educators, that the powtoon-based learning video media has met the criteria to be applied as a learning media for IPA
Analysis On Students’ Scientific Literacy of Newton’s Law and Motion System in Living Things
Authors: Budiarti* Indah Slamet , Tanta Tanta
Published: August 2021

The 21st century skills focus on scientific literacy competences in various urban and rural areas, one of which is Papua. Scientific literacy has competences to identifying scientific problems, explaining scientific phenomena, and utilizing scientific findings to solve problems. The purpose of this study was to determine the science literacy competences of IPA class VIII students of SMPN 5 Jayapura. Scientific literacy is competencies to understanding science, communicating science, and applying scientific conceptual to solve problems. A descriptive qualitative approach is used as this type of research. This research was conducted at SMPN 5 Jayapura. The sample selection used purposive sampling technique. There were 33 students who became respondents and teste in this study. The research instruments were documentation, observation, tests and interviews. The average percentage of competency aspects with indicators of identifying scientific problems, explaining scientific phenomena, and utilizing scientific findings is below 80%. The average percentage of aspects of knowledge about the concept of motion, with sub-concepts of regular motion, force, and Newton's laws is below 90%. The average percentage of human, animal and plant movement systems is below 70%. The highest score, average, median, mode, and lowest score of the cognitive scores of students' scientific literacy abilities were 100; 68.33; 75; 80; and 30. The scientific literacy competences of grade 8 students of SMPN 5 Jayapura are still low, which is shown in terms of the percentage of competence and is classified as moderate for the knowledge aspect. The conclusion of this study is that the scientific literacy competences of students at SMPN 5 Jayapura are in the sufficient category.
Assessing Visual Spatial Intelligence on Biology Content
Authors: Fatmawati* Baiq , Rustaman Nuryani Y. , Suprapto Purwati Kuswarini
Published: August 2021

One of the assessments in the learning processes is assessment of skills, the drawing is one of the competancy components standard of graduation in 2013 curriculum. However, teachers rarely do this assessment during the learning process instead microscopic practicum on abstract material including biology subjects. The research aim is to assess students' spatial visual intelligence on plant cell material and plant tissues, find out understanding concepts and student responses to apply spatial visual learning. The participants were 20 students SMA NW Pancor. Data collection used was students’ worksheets, and questionnaires. The data analysis was qualitative descriptive. The findings, spatial visual intelligence was seen when the teacher asked students to draw 2D cells and plant tissues before began to the core material, but did not appropriate with its’ original design. There are differences in the acquisition of scores on plant cell and tissue material, this proves that to help students' memory in making 2D images and understanding concepts, contextual media is needed such as by showing real objects and or it can also be done practicum. Therefore, the teacher can identify early about assessing the spatial visual competence, it was done by looking at the similarity of images made to the original, from the images made can be seen the students’ concepts mastery of the material being taught.
Peningkatan Kemandirian dan Hasil Belajar Peserta Didik Melalui Implementasi E-Modul Interaktif IPA Terpadu Tipe Connected Pada Materi Energi SMP/MTs
Authors: Linda* Roza , Zulfarina Zulfarina , Mas’ud Mas’ud , Putra Teja Pratama
Published: August 2021

Learning process during Covid-19 pandemic should have been anticipated because the 21st century and IR 4.0 era obligated teachers to facilitate student-centered learning and used of IT-based teaching materials, according students' needs and characteristics. Although, often found unqualify teaching materials. So, learning outcomes' target and students self' learning aspect will be obstructed. The research aimed to improve students self' learning and learning outcomes by implementing e-module. The research was final step of previous research (R D) which has produced a valid e-module. The research was the quantitative descriptive method. The research type used was quasi experimental with one group pretest-posttest design. The sample technique used was purposive sampling with 30 students of SMPN 2 Kandis as sample. The data collection technique was used questionnaires of students self' learning and tests of learning outcomes as instruments. Data was analyzed by descriptive statistics (percentage) for questionnaires, and paired sample t-test and N-Gain for tests. The results showed that students self' learning increase after using e-module from 64.69% to 81.04% (medium-high category). Also with students learning outcomes, obtained t0 = 7.55 ≥ ttab = 1.69 (dk = 29, α = 0.05) which means there was an increase. Based N-Gain = 0.76, the increasing in medium category. Thus, the implementation of integrated sains e-module with connected type on energy subject can be an alternative to improve students self' learning and learning outcomes