Jurnal Online Universitas Jambi
Not a member yet
13172 research outputs found
Sort by
LINTASAN BOLA BERMUATAN BERPUTAR DALAM MEDAN MAGNET DENGAN PENGARUH EFEK MAGNUS
Get PDFPenelitian ini menganalisis lintasan bola konduktor bermuatan dan netral dalam medan elektromagnetik tidak homogen dengan efek Magnus melalui simulasi numerik. Metode Runge-Kutta orde 4/5 diaplikasikan untuk menyelesaikan persamaan diferensial gerak yang melibatkan interaksi gaya Lorentz, Magnus, dan Gravitasi. Hasil simulasi menunjukkan perbedaan signifikan pada lintasan bola: kasus bermuatan (q = 1.0 C) membentuk heliks kompleks dengan displacement horizontal 12.5 m dan variasi ketinggian 3.8m akibat kopling elektromagnetik- rotasional, sedangkan kasus netral (q =0 C) menghasilkan lintasan parabola sederhana dengan displacement 2.3 m. Analisis gaya Magnus menunjukkan amplitudo osilasi lebih besar pada benda bermuatan, menegaskan pengaruh medan magnet terhadap energi rotasi
ANALISIS SPASIAL BERBASIS SISTEM INFORMASI GEOGRAFIS (SIG) UNTUK PEMETAAN BAHAYA DAN RISIKO TANAH LONGSOR DI KABUPATEN LAMPUNG UTARA
Get PDFKabupaten Lampung Utara termasuk daerah rawan tanah longsor yang telah mengalami kejadian dalam beberapa tahun terakhir. Penelitian dilakukan untuk menganalisis tingkat risiko tanah longsor melalui pendekatan Sistem Informasi Geografis (SIG) melalui komponen ancaman (hazard), kerenatan (vulnerability), dan kapasitas (capacity). Setiap komponen dibentuk berdasarkan parameter fisik dan social seperti curah hujan, kemiringan lereng, jenis tanah, tutupan lahan, geologi, kepadatan penduduk, serta ketersediaan sarana dan prasarana umum. Parameter tersebut diberikan skor dan bobot sesuai tingkat pengaruhnya, kemudian diolah menggunakan metode overlay spasial. Hasil analisis menunjukkan bahwa nilai indeks risiko tanah longsor berkisar antara 0,933-2,3 dan terbagi menjadi tiga kelas yaitu risiko rendah seluas 1.664,436 km², risiko sedang 754,743 km², dan risiko tinggi 39,820 km². Wilayah dengan risiko tinggi terindentifikasi di Kecamatan Tanjung Raja, Bukit Kemuning, dan sebagian Abung Tengah, sedangkan risiko rendah umumnya berada di bagian timur dan utara Kabupaten Lampung Utara. Secara umum, semakin tinggi tingkat ancaman dan kerentanan serta rendahnya kapasitas masyarakat di suatu daerah, maka semakin besar tingkat risiko tanah longsor yang berpotensi terjadi.
“Modul Elektronik Berbasis STEM: Kunci untuk Membuka Kreativitas Siswa di Era Digital”
No full textThis research is classified as qualitative descriptive research. This study aims to assess the need for the use of E-Modules as a tool in high school physics subjects. This research uses a qualitative descriptive approach. The research survey questionnaire as an instrument. The questionnaire was distributed through a google form link, which was then filled in online by 1st and 3rd semester students who had studied physics subjects especially the subject of alternating current electricity. This research focuses on high school students class XII. The research involved 54 student respondents. The results showed that all respondents or 100% of students stated that they really need STEM-based learning to be used as a learning resource. Based on this research, there is a need for a learning E-Module as a learning media. This preliminary research will be developed into further research to create a STEM-based learning E-Module to train creative thinking skills on direct current electricity materialPenelitian ini diklasifikasikan sebagai penelitian deskriptif kualitatif. Penelitian ini bertujuan untuk menilai kebutuhan penggunaan E-Modul sebagai alat bantu dalam mata pelajaran fisika SMA. Penelitian ini menggunakan pendekatan deskriptif kualitatif. Penelitian ini menggunakan angket sebagai instrumen penelitian. Angket disebarkan melalui link google form, yang kemudian diisi secara online oleh siswa kelas X semester 1 dan 3 yang telah mempelajari mata pelajaran fisika khususnya pokok bahasan listrik arus bolak-balik. Penelitian ini berfokus pada siswa SMA kelas XII. Penelitian ini melibatkan 54 responden siswa. Hasil penelitian menunjukkan bahwa seluruh responden atau 100% siswa menyatakan sangat membutuhkan pembelajaran berbasis STEM untuk digunakan sebagai sumber belajar. Berdasarkan penelitian tersebut, maka diperlukan sebuah E-Modul pembelajaran sebagai media pembelajaran. Penelitian pendahuluan ini akan dikembangkan menjadi penelitian lebih lanjut untuk membuat E-Modul pembelajaran berbasis STEM untuk melatih keterampilan berpikir kreatif pada materi listrik arus searah
ANALYSIS OF STUDENTS' THINKING STYLES IN READING FREE-BODY DIAGRAMS AND ANALYTICAL THINKING ON NEWTON'S LAWS
Get PDFAnalytical thinking skills are essential for understanding and solving physics problems, particularly those involving Newton's Laws. One effective way to develop these skills is through the use of free-body diagrams. This study aims to analyze the influence of students’ thinking styles, Concrete Sequential, Abstract Sequential, Concrete Random, and Abstract Random on their analytical thinking abilities in interpreting free-body diagrams. Conducted using a qualitative descriptive approach at State Junior High School 1 Mlarak, Ponorogo Regency, data collection methods included observation, interviews, and document analysis. The findings reveal that students’ thinking styles significantly affect their ability to comprehend and represent forces in free-body diagrams. Students with a Concrete Sequential style demonstrated a more systematic approach in identifying and organizing forces, while those with an Abstract Random style faced greater challenges in structuring information. These results suggest that visual-based learning, such as the use of free-body diagrams, can enhance physics understanding and analytical thinking skills when aligned with students’ thinking styles. This study serves as an initial effort to support the development of students' analytical thinking skills, especially in the context of visual representation in physics. Additionally, the findings can be used by teachers as a reference for designing instructional strategies that cater to diverse thinking styles, thereby enriching the practice of physics education and promoting higher-order thinking skills
INTEGRATING PEER LEARNING AND INQUIRY CYCLE WITH PHET TO IMPROVE UNDERSTANDING OF DYNAMIC ELECTRICITY
Get PDFMost eighth-grade junior high school students often experience difficulties in understanding abstract and complex physics topics, such as dynamic electricity, which frequently leads to misconceptions and negatively impacts learning outcomes. To address this problem, researchers developed and tested an integrated learning strategy that combines peer teaching, the inquiry learning cycle model, and the use of PhET simulations, enabling students to conduct virtual experiments. This study used the ADDIE development model, which includes the stages of analysis, design, development, implementation, and evaluation. The research subjects consisted of 32 ninth-grade students of SMPN 1 Bayongbong, with a one-group pretest-posttest design to measure the learning impact. The validation of the learning tool was carried out by four experts, who obtained an average score of 0.89, indicating high theoretical feasibility. In terms of practicality, teachers gave an average rating of 91%, and students gave an average rating of 87%, both indicating a very good level of practicality. During four meetings, students took pretests and posttests, engaged in peer teaching activities, and learned concepts directly through PhET simulations. Concept understanding was measured through a structured test and then analyzed using the N-Gain method. In this study, the N-Gain score obtained was 0.57, indicating a moderate category. In addition to quantitative data, student observations and reflections showed positive impressions. These findings strengthen the evidence that this learning strategy can help students better understand the concept of dynamic electricity.Penelitian ini merupakan penelitian pengembangan yang bertujuan untuk merancang dan mengevaluasi efektivitas strategi pembelajaran terintegrasi yang menggabungkan peer lesson dan model siklus pembelajaran berbasis inkuiri, didukung oleh simulasi PhET, untuk meningkatkan pemahaman konsep listrik dinamis siswa SMP. Penelitian menggunakan model pengembangan ADDIE (Analysis, Design, Development, Implementation, Evaluation). Validasi ahli menunjukkan skor kelayakan rata-rata sebesar 0,90 (sangat layak). Uji kepraktisan oleh guru dan siswa menghasilkan skor masing-masing 91,25% dan 87,60% (sangat praktis). Pengujian efektivitas melalui pretest dan posttest menunjukkan peningkatan pemahaman konsep yang signifikan dengan nilai N-Gain 0,57 (kategori sedang). Strategi ini melibatkan lembar kerja siswa (LKPD), rencana pembelajaran berbasis inkuiri, dan penggunaan simulasi PhET untuk membantu visualisasi konsep abstrak. Aktivitas siswa selama pembelajaran menunjukkan keterlibatan yang sangat tinggi dalam diskusi kelompok, eksplorasi simulasi, dan pembelajaran sebaya. Analisis data kualitatif dari wawancara dan observasi menunjukkan peningkatan kepercayaan diri, kolaborasi, dan pemahaman konsep siswa. Strategi ini efektif dalam mengatasi kesulitan belajar siswa pada materi listrik dinamis dan sesuai dengan prinsip Kurikulum Merdeka. Diharapkan penerapan strategi ini dapat diperluas ke mata pelajaran dan jenjang pendidikan lain
PENGEMBANGAN e-LKPD BERBASIS GUIDED INQUIRY DENGAN MENGGUNAKAN WEBSITE LIVEWORKSHEET UNTUK MENINGKATKAN KEMAMPUAN BERPIKIR KRITIS DAN KEMAMPUAN REPRESENTASI MATEMATIS PESERTA DIDIK
No full textAn e-LKPD based on guided inquiry has been developed using liveworksheets on the subject of heat and its transfer. The primary objective of this paper is to generate an inquiry-based e-LKPD that is demonstrably feasible, practical, and effective in enhancing students' critical thinking ability and mathematical representation. The methodology adopted for this development study adheres to the ADDIE model. The sampling procedure employed in the study utilized the cluster random sampling technique. Data acquisition was carried out using both testing and non-testing instruments. For the analysis of the gathered data, several techniques were applied: Aiken's V statistic was used for instrument validation, SBI was applied to the student response questionnaires, and the effectiveness analysis utilized MANOVA and GLM. This study’s main results are: (1) the inquiry-based e-LKPD utilizing Liveworksheet is suitable for deployment in advancing critical thinking and mathematical representation, as confirmed by assessments from expert validators, practitioners, and peers. (2) the developed e-LKPD is operationally practical for fostering these skills, evidenced by feedback collected through student response questionnaires concerning the learning medium. (3) the inquiry-based e-LKPD is demonstrably effective in enhancing students' critical thinking and mathematical representation, based on the improvement observed in students' pre-test and post-test scores following the use of the developed resource. A distinctive feature of this research lies in the seamless integration of the guided inquiry e-LKPD with the Liveworksheet. This integration allows students access to the learning material at any time, thereby contributing to the advancement of their critical thinking and mathematical representation ability
Formulation and Characterization of Microencapsules Containing Ethanol Extract of Sungkai Leaves (Peronema canescens Jack)
Get PDFThe Sungkai plant (Peronema canescens Jack) is a widely recognized medicinal plant in Indonesia, with its leaves recently gaining attention for their potential health benefits. This study explores the microencapsulation of ethanol extract from Sungkai leaves using three different coating materials—maltodextrin, inulin, and Arabic gum—at varying concentrations. The aim of this study was to identify the optimal microencapsulation formulation using these materials. Microencapsulation was performed using the extrusion method, and the best formulation was characterized by evaluating its physicochemical properties, morphology, and infrared (IR) spectrum. Antioxidant activity was measured using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. The results showed that microencapsulant formulation A1 exhibited superior physicochemical properties compared to other formulations. Scanning electron microscopy (SEM) analysis of sample A1 revealed a smooth surface with a slightly rounded shape and minimal wall folds or cracks, suggesting good stability. Fourier-transform infrared (FTIR) analysis confirmed effective encapsulation of the ethanol extract. While the crude extract demonstrated the highest antioxidant activity, microencapsulation slightly reduced this activity. Among the microencapsulated samples, formulation A1 (using Arabic gum) retained the most antioxidant potential. In conclusion, formulation A1, utilizing Arabic gum as the coating material, was found to be the optimal microencapsulation formulation for the ethanol extract of Sungkai leaves
Green Synthesis of Ag/Chitosan Nanoparticles using Avocado Leaves Bioreductor (Persea americana Mill.) as a Nitrite Colorimetry Detector
Get PDFUrinary tract infection (UTI) is one of the most common types of infection caused by the growth of microorganisms in the human urinary tract. Nitrite can be detected using spectroscopy, electrochemistry, chemiluminescence, chromatography, capillary electrophoresis, and flow injection analysis methods. However, this method takes quite a long time. So, this method is not suitable for rapid screening because it requires time for bacterial incubation and adequate sample preparation. So, there is a need for a fast-screening method that can diagnose UTIs through a nitrite colorimetric sensor. The colorimetric method is based on nanoparticles, which are relatively cheap and can provide visual and rapid detection. Nitrite is an indicator in diagnosing UTI. This research aims to determine the synthesis of Ag nanoparticles using avocado leaf bio-reductors (Persea americana Mill.) and chitosan as a stabilizer, which can be used as a colorimetric nitrite detector to minimize the use of dangerous and environmentally unfriendly inorganic materials. Characterization and analysis in this research used a UV-Vis spectrophotometer, FT-IR (Fourier Transform Infra-Red), and PSA (Particle Size Analyzer). The Ag nanoparticle synthesis process was carried out by varying the bioreductant volume, synthesis time, and chitosan concentration. It was found that the optimum synthesis time was 4 hours with an SPR value of 428 nm, an absorbance of 2.112 and a nanoparticle size. Apart from that, the optimum concentration of chitosan was obtained at a concentration of 2.5% with an SPR of 435 nm and an absorbance of 1.341 with a nanoparticle size. The results obtained from AgNPs/chitosan as a colorimetric nitrite detector showed a color change to purple with an LOD value of 0.1303 µM and an LOQ of 0.4345 µM.
Keywords: Ag Nanoparticles; Avocado Leaveas; Colorimetry; Nitrite
Sistem Enkapsulasi Maltodekstrin-Kitosan pada Ekstrak Kulit Kakao (Theobroma cacao Linn.) yang Ramah Lingkungan untuk Inhibisi Korosi pada Baja dalam Media Korosif
No full textThis research tested an encapsulated cocoa husk extract formulated with maltodextrin and chitosan at an 8:2 ratio for use as a steel corrosion inhibitor. The method of weight loss in 0.75 M sulfuric acid, seawater, and peat water solutions was used to test inhibitors. The analysis indicated that inhibitor efficiency increased with increasing concentration. At the same time, its efficiency decreased due to longer immersion periods, reaching a maximum of 94.07% in peat water when a 2.5 g/L concentration of inhibitors was applied for 1 day. These results indicate significant potential for encapsulated cocoa husk extract as a natural corrosion inhibitorKerusakan akibat korosi dapat mengakibatkan pencemaran lingkungan, kerusakan habitat, dan penipisan sumber daya. Kebocoran, tumpahan, dan emisi dari peralatan dan material yang terkorosi dapat mencemari tanah, badan air, dan udara, yang mengakibatkan dampak buruk pada ekosistem dan kesehatan manusia. Baja adalah salah satu material banyak digunakan dalam kehidupan sehari-hari dalam berbagai aplikasi, seperti industri dan manufaktur. Akan tetapi, baja sangat mudah mengalami korosi terutama dalam lingkungan korosif yang berdampak besar pada segi ekonomi, lingkungan hingga keamanan manusia. Upaya pencegahan korosi dengan pemanfaatan ekstrak bahan alam salah satunya yaitu ekstrak kulit kakao (Theobroma cacao Linn.) yang dilindungi menggunakan metode enkapsulasi. Proses enkapsulasi dilakukan dengan menggunakan penyalut maltodekstrin dan kitosan. Formulasi terbaik yang dihasilkan pada penelitian ini adalah perbandingan maltodekstrin : kitosan (8:2). Formulasi enkapsul terbaik selanjutnya digunakan sebagai inhibitor korosi pada baja dalam larutan asam sulfat 0,75 M, air laut dan air gambut. Penentuan efisiensi inhibisi baja dilakukan menggunakan metode kehilangan berat dengan variasi konsentrasi dan waktu perendaman. Untuk memperkuat hasil penelitian, dilakukan karakterisasi Fourier Transform Infra Red (FTIR) untuk mengidentifikasi gugus fungsi yang terdapat dalam enkapsul ekstrak ekstrak kulit kakao (Theobroma cacao Linn.) dan karakterisasi Scanning Electron Microscope (SEM) untuk mengetahui morfologi permukaan baja lunak sebelum dan sesudah perendaman. Hasil penelitian menunjukkan efisiensi inhibisi baja menggunakan inhibitor enkapsul ekstrak kulit kakao (Theobroma cacao Linn.) yang direndam dalam media korosi asam sulfat 0,75 M, air laut dan air gambut meningkat seiring dengan peningkatan konsentrasi inhibitor dan dan mengalami penurunan seiring bertambahnya waktu perendaman. Efisiensi inhibisi baja terbaik yakni dalam perendaman air gambut selama 1 hari dengan konsentrasi 2,5 g/L yaitu 94,07%
The Relationship Between Nutritional Intake and Behavioral Factors on the Incidence of Anemia in Female Adolescents in Senior High Schools in Jambi City
Get PDFAdolescents are one of the high-risk groups for anemia. Adolescent girls who experience anemia and chronic energy deficiency are at risk of becoming stunted mothers. This study aims to identify the prevalence and determinants of adolescent girls that increase the risk of anemia in Jambi City. This study is an analytical study using a cross-sectional research design. The study was conducted from July to November 2024. The population in this study were all female high school students in Jambi City in 2023, namely 6878 students. The minimum sample in this study was 201 female adolescents, who were divided into 6 public secondary schools that were randomized in clusters, grade XI female students, did not experience chronic/acute diseases related to bleeding. The variable of hemoglobin levels was measured by direct examination, the consumption variable was interviewed using a semi-FFQ questionnaire. Knowledge and attitude variables about anemia were also collected using a validated questionnaire. Univariate and bivariate tests and to measure the magnitude of risk using the SPSS data analysis program application. The results of this study are the prevalence of anemia in adolescent girls, namely 131 adolescents (64.7%) and the prevalence of chronic energy deficiency of 89 adolescents (44.3%). The conclusion is that the factors that influence the incidence of anemia in adolescent girls in Jambi City are carbohydrate intake (p.value = 0.033), protein intake (p-value = 0.000), iron intake (p.value = 0.000), zinc intake (p.value = 0.021), knowledge about anemia (p.value = 0.000), and attitudes towards anemia. (p.value = 0.000)