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INDONESIA
PENA SAINS
Published by Universitas Trunojoyo Madura
ISSN : 24072311     EISSN : 25277634     DOI : -
Core Subject : Science, Education, Agriculture,
Agriculture, Biological Sciences & Forestry Chemistry Mathematics Physics
Jurnal Pena Sains (p-ISSN: 2407-2311) (e-ISSN: 2527-7634) is published by Natural Science Education Study Program, University of Trunojoyo Madura as a medium to improve the creativity of lecturer, academics, practitioners, researchers, relating to the science education and science. The journal is published twice a year in April and October. Jurnal Pena Sains in collaboration with the Perkumpulan Pendidik IPA Indonesia (PPII).
Arjuna Subject : -
Articles 163 Documents
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DETERMINATION OF VITAMIN C IN SPINACH (Amaranthus sp.) USING TITRATION METHOD Allefeti Sandrika; Muhammad Abdurrahman Munir; Veriani Aprilia; Emelda Emelda
JURNAL PENA SAINS Vol 10, No 2 (2023): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v10i2.19172

Abstract

Vitamin C is a compound that is included in the group of water-soluble vitamins. The human body really needs vitamin C intake because it can act as an antioxidant which is closely related to collagen formation and iron absorption. Vitamin C is an organic compound that the human body needs in small amounts to maintain the body metabolic functions. Vitamin C is also one of the most important vitamins in increasing the body immunity This compound is very easy to find in fruits and vegetables, one of which is spinach. Spinach is a vegetable which generally contain vitamin C with an average of 158.54 mg/100 g. The research aims to analyze vitamin C levels in spinach using a titration method or also known as iodometric titration. This research method is included in an experimental study. The sample used in this research was obtained from Kotagede Market, Yogyakarta. The titration results for each spinach will be analyzed using Microsoft Excel, where the results have shown that the levels of vitamin C contained in snapper spinach (18.95 mg/100 g), picked spinach (46.39 mg/100 g), thorn spinach (14.52 mg /100 g) and red spinach (15.42 mg/100 g). Therefore, it can be concluded that this titration method can be used to accurately measure the vitamin C content in spinach. The iodometric titration method was chosen to analyze vitamin C levels because this application is very simple when compared to other methods. Ascorbic acid or vitamin C is known as a strong reducing agent and can simply be titrated using iodine solution.
VISIBLE WAVELENGTH EFFECT ON TEMPERATURE CHANGE IN GREENHOUSE EFFECT: LABORATORY DESIGN Isnawati Isnawati; Siti Sriyati; Eka Cahya Prima; Riandi Riandi
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.19973

Abstract

School internships typically adhere to a standard format, employing basic tools for educational purposes. Among these, the greenhouse effect modelling laboratory, traditionally conducted under direct sunlight, faces challenges due to the variability introduced by cloud cover. This variability limits the ability to study the influence of light wavelength on the greenhouse effect, an aspect not accounted for when using sunlight alone. This research aims to explore the impact of light wavelength on temperature changes within greenhouse effect models. In our methodology, we employed an experimental setup that simulated the greenhouse effect using artificial light sources of varying wavelengths: red (641 nm), orange (592 nm), yellow (586 nm), green (536 nm), and blue (474 nm). The experiment involved monitoring the temperature increase within the model greenhouse under each light condition, thereby isolating the effect of wavelength from other environmental variables. The results revealed a direct correlation between light wavelength and the rate of temperature increase in the greenhouse model. Specifically, longer wavelengths were associated with a quicker rise in temperature, highlighting the significant role of wavelength in the greenhouse effect's efficiency. This study underscores the necessity of incorporating wavelength considerations into greenhouse effect models, particularly in educational settings. By integrating such experiments into school curricula, students can gain a deeper, more nuanced understanding of the greenhouse effect, moving beyond the limitations of traditional sunlight-based experiments.
DESIGNING A CHEMO-ENTREPRENEURSHIP PRACTICAL INSTRUCTION IN THE TOPIC OF MACROMOLECULES Az-Zafira Syairul Faizah; Julia Mardhiya; Fachri Hakim
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.20183

Abstract

The CEP approach combines chemical knowledge with entrepreneurial concepts. In the manufacture of macromolecular products, a deep understanding of chemistry is essential. Entrepreneurship education is very important because it raises enthusiasm and motivates students to start a business when they graduate from school. The research objective is to design practical instruction for Chemo-Entrepreneurship (CEP) focusing on the subject of macromolecules. The type of research used for the development of practical instructions in this study is Research and Development. The development method is ADDIE (Analysis, Design, Development, Implementation, and Evaluation). The product developed was validated by six validators in the valid category according to Aiken's V table with a validity value of 0.846. The research subjects in the product trial developed in this study were students of class XII MIPA SMAN 1 Cepu. The assessment of student responses was in the very good category with a percentage of 94.3%. It can be concluded that the CEP-practical guide is feasible to use. The resulting product is expected to be used as a learning resource on the macromolecule topic.
THE EFFICIENCY AND COEFFICIENT OF SPORTS BALLS RESTITUTION USING AN ACOUSTIC APPLICATION Frank Angelo Abayog Pacala; Unofre Pili
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.19422

Abstract

Studying the efficiency of a sports ball and its coefficient of restitution is important for performance optimization, fairness, and consistency of play. This research paper is dedicated to studying the coefficient of restitution and bounce efficiency in sports ball. Ping Pong ball and tennis balls were used to show the relationship between the bounce height and drop height. This paper used standard laboratory equipment like meter ruler, retort stand, clamp and with the utilization of the acoustic program of the smartphone using PhyPhox. The result showed that the application was able to accurately measure the bounce height in relation to the drop height. This was showed in the straight-line graph plotted. There was a constant ball efficiency coefficient of restitution and have very small percent error from the standard. This experiment can boost the interest and confidence of students in the classroom. Being able to accurately measure the performance of different balls can help students understand the science and engineering principles behind how they work. This knowledge can benefit students by allowing them to make more informed decisions when purchasing sports equipment, as well as give them an opportunity to modify their playing methods and strategies.
THE INFLUENCE OF HEAVY METALS ON THE ABSORPTION OF CATIONIC DYES Mustapa Mustapa; Aisyiah Restutiningsih Putri Utami; Chaleb Paul Maanari; Miftahul Jannah; Stefan Marco Rumengan
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.24999

Abstract

Cationic dyes are dyes containing amine derivatives that can be used on cellulose, protein, nylon, acrylic and synthetic fibers but these dyes are less fast in coloring. This study investigates the impact of Pb2+ heavy metal ions on cationic dye absorption utilizing molecularly imprinted polymers as adsorbents. Concentrations of Pb2+ ranging from 0 to 50 mg/L were examined. In a one-hour interaction, 50 mg of adsorbent was introduced into a solution containing 100 ppm methylene blue dye and Pb2+ with varying concentrations. Following centrifugation, the filtrate was collected, and dye concentration was measured using a visible light spectrophotometer. The sorption capacity of the dye with Pb2+ reached 41.22 mg/g at the highest concentration and 35.83 mg/g at the lowest. Notably, an inverse relationship was observed between Pb2+ concentration and absorption capacity, indicating a decrease as metal ion concentration increased, though stability was maintained. These findings contribute valuable insights into the nuanced dynamics of heavy metal ions and cationic dye absorption, shedding light on potential applications of molecularly imprinted polymers as effective adsorbents.
THE INFLUENCE OF TILT ANGLE ON THE DAILY PROFILE TOTAL ENERGY OF PHOTOVOLTAIC POLYCRYSTAL Bagas Aryaseta; Primasari Cahya Wardhani; Nur Aini Fauziyah; Achmad Dzulfiqar Alfiansyah; Syahrul Munir; Aulia Dewi Fatikasari; Nia Dwi Puspitasari
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.19506

Abstract

This preliminary study aims to determine the daily profile of the power output generated from solar panels, with variations in the house’s roof angles of 15º, 0º, 15º. Tilt angle investigation expects to discover the impact of placing solar panels on the slope of the tile used on the house’s roof. The collecting data of this study was investigated the data of current and voltage every hour that produced by solar panel. Besides, this study also comparing the result of total energy output value for daily profile of solar panel during ten hour per day (start from 7 am to 5 pm). The results show that solar panels with an angle of -15º at 07:00 – 10:00 WIB have higher output voltage and current than other angle variations. At a tilt angle of 0º, the output voltage and current of the solar panel are higher at 11:00-14:00 WIB, while at a tilt angle of 15º in the afternoon. Based on observations, each solar panel with exposure for 10 hours obtained the total energy value for polycrystalline solar panels with a tilt angle of -15º of 258.44 Wh, solar panels with an angle of 0º obtained an energy value of 263.64 Wh, and a tilt angle of 15º obtained energy values 260.69 Wh. The photonic energy emitted for 10 hours is 2097.47 Wh. The energy efficiency value for each polycrystalline solar panel is 12.32% for the angle of -15º, the angle of 0º is 12.57%, and 12.43% for the angle of 15º. In conclusion, variations in the angle of the solar panels have significant effect on the voltage, current, and energy generated from polycrystalline solar panels in every hour. However, based on the data result the total energy exposure and the efficiency value for each variation angle has no significant different. Pyramid-shaped house roof construction has the advantage of increasing the value of the cross-sectional area of the tile, which has the opportunity to install wider-sized solar panels so that a greater value of electrical energy is obtained.
DEVELOPMENT OF INITIAL ABILITY TEST INSTRUMENT BASED ON SCIENCE GENERIC SKILLS Arta Elsa Ambarita; Ratu Evina Dibyantini; Ani Sutiani; Zainuddin Muchtar; Marudut Sinaga
JURNAL PENA SAINS Vol 11, No 1 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i1.19547

Abstract

This study aims to develop an initial ability test instrument based on science generic skills in the form of a scholastic test and develop a final chemistry evaluation test instrument in the topic of thermochemistry as well as find out the validity of the content and construction validity of the instrument. Research and development research, with a 4D development model consisting of 4 main stages, namely: Define, Design, Develop and Disseminate, due to time constraints this research was only up to develop. The results of the content validity test by experts obtained an average percentage of material aspects, namely 87.08%, construction aspects, namely 90.41%, language aspects, 92.5% and additional rules, 96.67%, so the question instrument is suitable for use. Based on the construction validation test data, it was found that of the 20 questions on the scholastic potential test tested, there were 19 questions that were valid and considered appropriate, while 1 other item was invalid, while of the 20 questions on the chemistry test tested, there were 17 questions that were valid and considered feasible, leaving 3 questions other invalid. For further research, it is hoped that this instrument can be implemented.
MACHINE LEARNING MODELS FOR PREDICTING STRESS VALUE IN THE TENSILE STRENGTH OF BIOFILMS FROM STARCH AND HAIR WASTE Utami, Hermin Hardyanti; Fitrah, Muhammad Aqdar; Yusriadi, Yusriadi; Ardiansah, Ardiansah; Arminas, Arminas; Lestari, Mega Fia; Towolioe, Sherly
JURNAL PENA SAINS Vol 11, No 2 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i2.26227

Abstract

Biofilms, structured communities of microorganisms, have emerged as a subject of significant interest across various industries due to their unique biodegradable and sustainable characteristics. Hair waste is an incredibly rich source of keratin, and this abundance makes it a promising candidate as a fundamental building block for the development of biodegradable plastics. This study focuses on sustainable biofilms derived from biodegradable materials, specifically a unique combination of starch and hair waste. Machine Learning models, implemented in RapidMiner, were utilized to predict the tensile strength of these biofilms, with the goal of enhancing quality control in their production. Neural Networks and Deep Learning methods were employed to compare their predictive capabilities, assessing both their strengths and limitations. Through rigorous data collection, feature identification, and detailed data analysis, critical factors influencing the quality of the biofilms were identified. The results revealed the remarkable predictive accuracy of the Neural Net model, particularly for Ratio 40, while the performance of the Deep Learning model varied across different ratios. The lower RMSE of the Neural Net model indicated a more precise alignment between the predicted and actual values, distinguishing it as the superior model. This research contributes to the advancement of sustainable biofilm development, offering eco-friendly solutions through the use of unconventional materials. Both models offer valuable predictive capabilities, and the choice between them may depend on the specific requirements and contexts of the application. In conclusion, the performance of the Neural Net and Deep Learning models in predicting stress in tensile strength varies across different ratios.
THE EFFECT OF COOPERATIVE LEARNING MODEL USING GAME-BASED MEDIA TOWARD STUDENTS’ LEARNING OUTCOMES AND ACTIVITY Rahma, Yulia; Djulia, Ely
JURNAL PENA SAINS Vol 11, No 2 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i2.26687

Abstract

This study aims to determine the effect of the implementation of the Team Games Tournament (TGT) type cooperative learning model assisted by wordwall quiz media on earth and solar system material on learning outcomes and activeness of seventh grade students of SMPN 6 Kisaran. The study used a Quasi Experimental design with a Pretest and Posttest Control Group Design research design. The sample consists of two classes, namely the experimental class with the TGT learning model and the control class using the direct learning model with a total of 32 students each. Sampling was done by random sampling technique. Data collection was carried out using tests and observations. The data were analyzed by testing the hypothesis using the Mann Whitney test on student learning activeness and the Independent Sample T-test on student learning outcomes. The results of observations of student learning activeness show that the average value of student learning activeness of the experimental class is 79.2 which is included in the category of very active and the control class is 65.2 which is included in the active category. The pretest learning outcomes of students in the experimental class showed an average value of 36.6 students and in the control class 33.6. The posttest learning outcomes of students in the experimental class showed an average score of 78.4 with 24 students complete and in the control class 57.3 with 4 students complete. Hypothesis testing shows that there are significant differences in student activeness and learning outcomes in the experimental class using the Teams Games Tournament Type Cooperative learning model assisted by Wordwall Quiz compared to the control class using the direct learning model on solar system material.
STUDENTS’ RESPONSE TOWARD THE COMPETENCIES OF TEACHERS: AN EXPLORATORY STUDY Novitasari, Susi; Noviani, Sulis; Murtini, Iin
JURNAL PENA SAINS Vol 11, No 2 (2024): Jurnal Pena Sains
Publisher : Program Studi Pendidikan IPA, Fakultas Ilmu Pendidikan, Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/jps.v11i2.25434

Abstract

Teachers are one of the main key holders of the success of an education process. As the spearhead of education, the ability of teachers determines the success of education. Teachers apply their competences in conducting the learning process. This research aims to determine students’ responses toward the integrity of honorary teachers and civil servant teachers in the Lamongan, Tuban and Bojonegoro residency areas. The method used in this research is a qualitative approach using a questionnaire distributed via Google Form to high school or equivalent students in several residency areas in Lamongan, Tuban and Bojonegoro. As well as literature studies to strengthen the information we obtain through library materials in the form of previous research articles that are relevant to the topic discussed. There are several differences in the responses of high school or equivalent students in the Lamongan, Tuban and Bojonegoro residency areas regarding the integrity of honorary teachers and civil servant teachers. Regarding the timeliness of starting and ending lessons, the percentage of discipline for honorary teachers is higher than that of civil servant teachers, in creating and using learning media, honorary teachers are more creative; in giving pre-tests and post-tests, honorary teachers carry them out more often. However, in terms of behavioral discipline when teaching in class, civil servant teachers are more disciplined than honorary teachers and in explaining material in class, students more easily understand the material presented by civil servant teachers. To conclude, teachers must have high integrity as educators, namely acting consistently between what has been said or taught with behavior in accordance with the values of a teacher, namely honesty, responsibility and discipline.

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