JURNAL RISET RUMPUN MATEMATIKA DAN ILMU PENGETAHUAN ALAM
Bidang kajian dalam jurnal ini termasuk sub rumpun Ilmu IPA, Ilmu Matematika, Ilmu Kebumian dan Angkasa. Jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam menerima artikel dalam bahasa Inggris dan bahasa Indonesia dan diterbitkan 3 kali setahun: April, Agustus dan Desember. E-ISSN: 2828-9390 (Online), P-ISSN: 2828-9382 (Cetak). Jurnal ini adalah jurnal Riset Rumpun Matematika dan Ilmu Pengetahuan Alam yang bersifat peer-review dan terbuka. Jurnal ini terakreditasi SINTA 5 (Surat Keputusan Direktur Jenderal Pendidikan Tinggi, Riset, dan Teknologi Nomor 10/C/C3/DT.05.00/2025 tanggal 21 Maret 2025 tentang Peringkat Akreditasi Jurnal Ilmiah Periode I Tahun 2025) dimulai dari Volume 1 Nomor 2 Tahun 2022 sampai Volume 6 Nomor 1 Tahun 2027.
Mikroenkapsulasi Minyak Bandeng Omega-3 Melalui Wet Rendering dan Netralisasi Alkali Teroptimasi untuk Mutu Oksidatif
The use of fish oil as a natural source of omega-3 fatty acids, particularly EPA and DHA, often encounters challenges such as oxidative instability, unpleasant fishy odor, and variations in composition. This research focused on producing omega-3–enriched milkfish (Chanos chanos) oil that meets quality standards for microencapsulation, applying the wet rendering method followed by alkali neutralization with NaOH. The process involved varying temperatures of 70, 80, 90, and 100 °C and heating times of 30, 40, and 60 minutes. The crude oil obtained was refined using different NaOH concentrations, then evaluated for oxidative parameters including peroxide value (PV), p-anisidine value (p-AV), total oxidation value (TOTOX), and acidity levels (acid value/free fatty acids, FFA), all compared with International Fish Oil Standards (IFOS). The maximum yield recorded was 0.29% at 100 °C for 60 minutes. The results showed that PV and p-AV values were still within acceptable IFOS limits (3.44 meq/kg and 11.75 meq/kg), and TOTOX values remained below 20, indicating good oxidative stability. However, prolonged heating led to increased acid values/FFA ranging from 2.43% to 2.68%, surpassing IFOS limits and reflecting hydrolytic degradation of the oil. These findings demonstrate the trade-off between achieving higher yields under higher temperature and longer heating versus maintaining oil quality. Therefore, optimal processing at a maximum of 100 °C and not exceeding 30 minutes, combined with alkali neutralization, is recommended to ensure the production of stable, high-quality milkfish oil suitable for encapsulation and incorporation into health-oriented functional foods.
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Penerapan Teori Belajar Behaviorisme untuk Meningkatkan Keterlibatan Siswa dalam Pembelajaran Matematika
This study aims to examine the application of behaviorism learning theory in enhancing student engagement in mathematics learning, particularly arithmetic sequences and series. The study was conducted at SMK Karya Serdang Lubuk Pakam with 24 tenth-grade students in a single meeting on September 17, 2025. The research team delivered the material, provided stimulus in the form of problems written on the board, and applied positive reinforcement by giving rewards to students who dared to and successfully answered. Data were collected through observation, field notes, and brief interviews. The results showed a significant increase in student engagement: more students volunteered to solve problems on the board, the classroom atmosphere became more lively, and participation in discussions improved. Although some students remained hesitant, the behaviorist strategy proved effective in enhancing motivation and engagement. These findings reinforce the theories of Thorndike, Pavlov, and Skinner, which emphasize the stimulus–response relationship and reinforcement as the basis of learning (Hamruni et al., 2021; Yusup, 2024).
Analisis Peningkatan Kemampuan Berpikir Tingkat Tinggi Siswa Kelas XII dalam Pembelajaran Materi Dimensi Tiga
This study aims to analyze the improvement of Higher Order Thinking Skills (HOTS) through mathematics learning on the Three-Dimensional Geometry topic in Grade XII of Yayasan Pendidikan Al-Fattah Medan. HOTS is a crucial aspect of 21st-century education because it helps students develop critical, creative, logical, and reflective thinking skills in addressing complex problems. In the context of mathematics learning, particularly in spatial geometry, mastering HOTS not only supports students in understanding abstract concepts but also in applying them to real-life situations. This study employed a descriptive qualitative method with instruments consisting of a pre-test, post-test, and an open-ended questionnaire to explore students’ understanding and learning experiences. The findings revealed a significant improvement, where the average pre-test score of 7 increased to 52.21 in the post-test. This result highlights that the implementation of HOTS-based learning strategies is effective in enhancing students’ comprehension of distance, angles, and point positions in space, while simultaneously strengthening their analytical, evaluative, and creative abilities. The study implies the importance of adopting innovative learning strategies oriented toward HOTS development to improve the quality of mathematics education and prepare students for global challenges.
Studi Literatur : Efektivitas Metode Tanya Jawab dalam Pembelajaran Matematika
This study aims to analyze the effectiveness of the question-and-answer method in mathematics learning. The research method employed is a literature review using a descriptive qualitative approach. Findings from several relevant studies indicate that the question-and-answer method enhances students' learning outcomes, fosters active participation, and strengthens critical thinking and communication skills. Variations in its implementation, such as multi-directional questioning, chain questioning, and experiment-based questioning, enrich classroom interaction and help students grasp abstract mathematical concepts. Furthermore, the method promotes an interactive learning environment where students are encouraged to think critically, reflect on their understanding, and actively engage with their peers. The collaborative nature of the question-and-answer technique supports the development of social skills, making it an effective tool for both cognitive and social learning. Therefore, the question-and-answer method can be considered an effective instructional strategy to improve the quality of mathematics learning, particularly in enhancing problem-solving abilities, fostering a deeper understanding of mathematical concepts, and improving student-teacher interactions.
Analisis Regresi Kernel Gaussian untuk Memprediksi Indeks Pembangunan Manusia (IPM) Berdasarkan Faktor Sosial-Ekonomi Provinsi di Indonesia
The Human Development Index (HDI) functions as a key indicator for assessing the level of welfare and overall quality of life of the population within a specific region. This study aims to examine the socio-economic factors influencing HDI at the provincial level in Indonesia using a Gaussian kernel regression approach. A nonparametric method is employed due to its flexibility in capturing nonlinear relationships between the response and predictor variables without the need to assume a specific functional form. The analysis utilizes secondary data, including education, poverty, per capita expenditure, expected years of schooling, open unemployment rate, and gross regional domestic product for each Indonesian province. The findings from this study indicate that educational factors, particularly mean years of schooling and expected years of schooling, exert the most significant impact on HDI improvement. The estimated Gaussian kernel regression model demonstrates a coefficient of determination of 0.9954 and a residual standard error of 0.3468, reflecting a very high predictive accuracy and relatively low error. These results suggest that Gaussian kernel regression is an effective nonparametric approach for analyzing human development in Indonesia.
Tinjauan Literatur mengenai Tingkat Infestasi Ektoparasit pada Udang Vaname (Litopenaeus vannamei) di Sistem Tambak Budidaya
The shrimp farming industry in Indonesia is predominantly dominated by Vannamei shrimp (Litopenaeus vannamei), also known as white shrimp. This shrimp species is favored due to its fast growth rate and high economic value. However, the intensive farming practices often lead to various diseases, particularly those caused by parasitic infections. Ectoparasitic infections can create wounds on the shrimp’s body, making it easier for other pathogens like fungi, bacteria, and viruses to invade. This study aims to identify the types and levels of ectoparasite infestations on Vannamei shrimp to understand their impact on shrimp health and farm productivity. The research method used is a literature review, gathering data from various sources such as scientific journals, books, research reports, and technical notes related to shrimp farming. The findings of the study show that the presence of ectoparasites can serve as an important indicator to assess the health of the farming environment. High levels of parasitic infestations indicate suboptimal environmental conditions, such as poor water quality or improper management practices. Therefore, early identification of ectoparasites is crucial to prevent the spread of diseases and ensure the sustainability of Vannamei shrimp farming in Indonesia.
Penguatan Kompetensi Praktis Mahasiswa Pendidikan Biologi melalui Pelatihan Pembuatan Filter Air Sederhana
Clean water is a fundamental necessity; however, many regions still struggle to access it due to contamination by suspended particles, organic matter, and harmful microorganisms. This activity aims to strengthen the practical competence of Biology Education students at Universitas Negeri Medan through training in making simple water filters. The training was conducted through demonstrations and simulations using turbid water from the Tembung River as a sample. The filter was constructed from readily available materials such as used plastic bottles, cotton, tissue, sand, small gravel, and palm fiber arranged in layers. The results showed that the filter effectively reduced water turbidity and enhanced students’ skills in clean water treatment technology. The training also encouraged students to develop 21st-century skills such as critical thinking, problem-solving, and collaboration, while preparing them as future educators capable of raising community awareness about the importance of maintaining water quality. Therefore, this training has the potential to be developed as an applicative environmental education model that contributes positively to clean water provision.
Uji Organoleptik Nugget Ikan Kembung dengan Penambahan Rumput Laut (Eucheuma cottonii)
This study aims to describe: 1) Formulation of mackerel fish nuggets with the addition of seaweed (Eucheuma cottonii); 2) to detemine the level of panelists’ preference for the resulting product. This study uses a quantitative method with an experimental approach. Data colletion uses an observation method by distributing preference test sheet to the public (consumers). Then analyzed using quantitative descriptive. Research results: 1) Formulation using 350 gr mackerel surimi, 70 gr seaweed (Eucheuma cottonii), 60 gr eggs, 100 gr wheat flour, 15 gr garlic, 30 gr shallots, 2,5 gr ground pepper, 10 gr salt, 5 gr sugar; 2) The preference test results indicated that the inner color (4,38), outer color (4,58), solid inner texture (4,44), crispy outer texture (4,26), aroma (4,36), natural taste (4,48), and shape (4,6) were in the very liked category, while the chewy inner texture (4,08) and savory taste of the spices (4,14) were in the liked category. Overall, mackerel nuggets with the addition of seaweed (Eucheuma cottonii) were categorized as very liked and had the potential to become an innovative product that was accepted by the the general public.
Analisis Pemahaman dan Kesulitan Siswa pada Materi Peluang di Kelas XII SMA Negeri 1 Tanjung Morawa
This study aims to analyze students' understanding and difficulties in probability in grade XII of SMA Negeri 1 Tanjung Morawa and identify the contributing factors. The research method used is descriptive with quantitative and qualitative approaches. Quantitative data were obtained from the results of the problems given to students, then analyzed to determine the level of understanding, types of errors, and the percentage of difficulties experienced. Meanwhile, qualitative data were obtained through interviews with subject teachers to deepen information regarding the obstacles faced by students and the learning strategies implemented. The results showed that most students experienced difficulties in determining the sample space, applying probability formulas, and interpreting calculation results. Contributing factors include limited understanding of basic concepts, a lack of variety in practice questions, and learning that still focuses on procedures. Based on these findings, the researcher offers solutions in the form of contextual learning, conceptual reinforcement through class discussions, and the provision of step-by-step practice questions with teacher guidance. This research is expected to contribute to teachers in improving the effectiveness of probability learning in schools.
Peran Logika dalam Pembelajaran Matematika: Pengenalan Konsep Pembuktian Sejak Awal
Logic is an important foundation in mathematics learning because it shapes critical and systematic thinking skills. Introducing the concept of proof early on plays a strategic role in developing reasoning skills, identifying patterns, and providing simple arguments. This article aims to examine the role of logic in mathematics learning by emphasizing the importance of introducing the concept of proof from the outset. The methods used are a literature review of various relevant studies and descriptive analysis based on learning practices in early childhood education. The results of the study show that play, exploration, and concrete experience-based learning activities can improve children's ability to understand cause-and-effect relationships, make predictions, and convey logical reasons. In addition, social interaction and dialogue in the learning process have been proven to strengthen simple reasoning skills. In conclusion, the integration of logic and reasoning from an early age not only supports the development of mathematical abilities, but also builds the foundation for critical and analytical thinking needed for further education.
Desain Pembelajaran Operasi Hitung Bilangan dengan Pembelajaran Kontekstual dalam Meningkatkan Literasi Numerasi Matematika Siswa
This study aims to develop a contextual-based mathematics learning module to improve mathematical numeracy literacy among fourth-grade elementary school students, particularly on arithmetic operations. This research employed a Research and Development (R&D) design using the ADDIE development model consisting of analysis, design, development, implementation, and evaluation stages. The research subjects were 22 fourth-grade students at SDN 2 Siryawangi. The instruments used included expert validation sheets, teacher and student response questionnaires, and numeracy literacy tests. Data were analyzed using a qualitative descriptive approach supported by the N-Gain test to measure students’ improvement after using the module. The findings indicate that the developed module meets the criteria of validity, practicality, and effectiveness. This is supported by the validation results from material and media experts, each obtaining an average score of 95%, which is categorized as highly valid. In addition, teacher responses of 75% and student responses of 88% show that the module is practical and feasible to be used in the learning process. Furthermore, the effectiveness test results, based on an N-Gain score of 84%, demonstrate a high-level improvement in numeracy literacy. Therefore, this module is feasible to be implemented as an alternative teaching material for contextual learning in elementary schools.
Pemahaman Konsep Pembuktian sebagai Dasar Pengembangan Penalaran Matematis Siswa SMP
Mathematics learning plays an essential role in developing students’ logical, systematic, and analytical thinking skills. One of the higher-order thinking abilities that serves as a main focus in mathematics education is mathematical reasoning. This ability is closely related to the process of mathematical proof, which functions to justify the truth of a statement logically. This study aims to examine the relationship between the understanding of proof concepts and the development of mathematical reasoning among junior high school students through a library research approach. Data were obtained from various sources such as textbooks, journal articles, research findings, and relevant educational documents. The analysis was conducted using the content analysis method to review both conceptual and empirical findings from the literature. The results indicate that understanding the concept of proof not only helps students comprehend the logical structure of mathematics but also contributes to the development of deductive and reflective reasoning skills. Engaging in proof activities enables students to shift from merely imitative reasoning toward independent logical construction (creative reasoning). However, teaching proof at the junior high school level still faces several challenges, such as students’ limited understanding of basic logic, time constraints, and the lack of teacher training in teaching proof effectively. Therefore, learning strategies that emphasize students’ thought processes, provide opportunities for exploration, and integrate proof activities into meaningful learning contexts are needed.
Uji Validitas Konstruk Instrumen MARS-30 dalam Mengukur Kecemasan Matematika Siswa Melalui Simulasi Monte Carlo
Mathematics anxiety is a psychological barrier that negatively affects students’ performance and self-confidence. A valid and reliable measurement tool is required to identify this condition accurately. This study aims to examine the construct validity of the Mathematics Anxiety Rating Scale 30 (MARS-30) using a Monte Carlo simulation approach. The research employed first-order confirmatory factor analysis (CFA) through R software with a simulated sample of 300 respondents. The findings revealed that the overall measurement model achieved excellent fit indices, as indicated by Normed χ², RMSEA, SRMR, and CFI, all within the optimal range. Nevertheless, only 8 out of 30 items (26.7%) met the validity criteria, while the remaining 22 items were found invalid. This result suggests that although the global model fit was adequate, most items of MARS-30 did not consistently represent the construct of mathematics anxiety. The implication of this study highlights the necessity of revising the instrument by refining item wording, adjusting indicators, and conducting further testing to ensure stronger construct validity. A more valid instrument will enable educators and researchers to design targeted pedagogical interventions for reducing mathematics anxiety and supporting students’ learning outcomes.
Formulasi dan Evaluasi Parfum Aroma Dasar dari Minyak Atsiri Daun Aromatik Indonesia dengan Fiksatif Melati
The growing demand for natural, sustainable personal care products has driven interest in perfumes formulated with plant-based essential oils and natural fixatives. This study aims to develop and evaluate base-note perfumes using essential oils extracted from three Indonesian aromatic leaves—lemongrass (Cymbopogon citratus), basil (Ocimum basilicum), and kaffir lime (Citrus hystrix)—combined with jasmine (Jasminum sambac) oil as a fixative. Essential oils were extracted by hydrodistillation, and three formulations were prepared, each containing a 30:70 blend of essential oil to ethanol. The perfumes underwent organoleptic testing by 15 trained panelists, along with evaluations of fragrance longevity (over 12 hours) and stain effects on paper substrates. Among the formulations, the blend of kaffir lime and jasmine (Formula 2) exhibited the highest average scores across sensory parameters, including fragrance intensity and freshness. It also retained a perceptible aroma for more than 12 hours and showed minimal staining. The results indicate that natural perfumes made with local essential oils and jasmine fixatives can meet consumer expectations for quality and performance. This study highlights the potential of Indonesian aromatic plants in sustainable perfumery and suggests avenues for future innovation in natural fragrance design.
Dampak Limbah Makanan di Sektor Rumah Tangga terhadap Keberlangsungan Lingkungan
Food waste generated from the household sector is one of the largest contributors to environmental degradation in Indonesia. Food waste generated from the household sector is one of the main contributors to the increasing volume of organic waste in Indonesia. This issue not only creates social and economic problems but also poses a serious threat to environmental sustainability. This study aims to analyze the contribution of household food waste to environmental degradation and to review sustainable management strategies. This study employs a Systematic Literature Review (SLR) method guided by the PRISMA 2020 Statement to review relevant national research conducted during the period 2018-2025. The results of the literature selection show that the impacts of household food waste on environmental sustainability can be categorized into three main dimensions: (1) ecological impacts, including pollution and the increase of greenhouse gas emissions; (2) resource impacts, such as the wastage of energy, water, and land; and (3) social-environmental impacts, including the increasing burden of regional waste management and the declining quality of life for communities living near landfills. The findings emphasize that the management of household food waste plays a crucial role in achieving environmental sustainability, particularly in supporting the attainment of Sustainable Development Goal (SDG) 12, which focuses on responsible consumption and production. Therefore, it is necessary to implement strategies of reduction, reuse, and recycling of food waste at the household level to minimize the negative impacts on environmental sustainability in Indonesia.
Uji Daya Simpan Sambal Kecicang dengan Penyimpanan Vakum
This study aims to examine the organoleptic storage life of kecicang chili sauce using vacuum storage. The research design is experimental, involving 3 trained panelists, all of whom are lecturers from the Culinary Arts Vocational Education Study Program. The data collection method used in this study was observation through organoleptic testing using a 5-point Likert scale, namely 5) Very Good, 4) Good, 3) Fairly Good, 2) Not Very Good, 1) Very Poor. Data analysis used quantitative descriptive methods. The results of this study indicate that: 1) Processing affects the quality of kecicang chili sauce, using a technique that involves grinding the ingredients using a chopper, cooking at a temperature of ±70°C, and then vacuum packing. The organoleptic test results showed that vacuum storage was able to maintain the sensory properties of the sambal, as assessed from the aspects of colour, distinctive kecicang aroma, kecicang texture, solid dough texture, and distinctive kecicang taste, which were rated “fairly good” based on colour, aroma, texture, and taste. Vacuum-sealed sambal maintained its best quality until day 3rd, with no signs of leaking. The most significant changes occurred in the flavor and aroma, rendering it unfit for consumption. The sambal packaging, which showed no signs of leaking, maintained its sensory quality until day 5.
PENGENALAN Pengenalan Pembuktian Matematika untuk Siswa: Membangun Dasar Logika dan Pemahaman
This study aims to analyze the role and strategies of introducing mathematical proofs appropriately for students, as well as to describe their contribution to enhancing logical, critical thinking, and understanding of mathematical concepts. The method used is library research with a descriptive qualitative approach through the analysis of various current scientific literature relevant to mathematics learning and education. The results of the study indicate that mathematical proofs not only function as a tool for verifying the truth of a statement but also as an epistemological process that develops deductive, argumentative, and reflective reasoning skills in understanding the structure and relationships of mathematical logic. Effective introduction strategies include the use of visual representations, collaborative learning, linguistic scaffolding, and the application of a gradual approach from informal argumentation to formal deduction. The approach has been proven to enhance students conceptual understanding, argumentative skills, and logical awareness. The implication is that proofs need to be systematically integrated into mathematics learning in secondary schools to strengthen Higher Order Thinking Skills (HOTS) and develop a scientific mindset in accordance with the principles of the Merdeka Curriculum
Pemahaman Masyarakat Tentang Pencemaran Udara terhadap Lingkungan Hidup di Kota Serang
Air pollution is an increasingly serious environmental issue in major cities, including Serang City. The decline in air quality due to motor vehicle emissions, industrial activities, waste incineration, and the reduction of green open spaces harms public health and the environment. Polluted air can cause respiratory problems, reduce the quality of life, and threaten urban ecosystems. This study aims to analyze the level of knowledge, perceptions, and behaviors of Serang City residents regarding air pollution, as well as assess their support for air pollution control policies. The methods used include a mixed-method approach through questionnaires, in-depth interviews, and participatory observation. The results of the study show that the community has a good understanding of the sources of air pollution, particularly vehicle and industrial emissions. They are also aware of the impact of pollution on health, especially for children and the elderly. However, the implementation of protective behaviors such as wearing masks is not yet consistent. Some positive behaviors have begun to develop, such as not burning trash and planting plants at home. Support for pollution control policies is also high. This study emphasizes the importance of continuous education, law enforcement, and collaboration between the government, society, and environmental communities in efforts to mitigate air pollution in Serang City.
Efektifitas “Plasma” Schoology dalam Meningkatkan Self Regulated Learning (SRL) Siswa Kelas XII IPA SMAN 1 Gedongtataan
The use of virtual classrooms in the learning process is a strategic step to create a flexible learning experience, accessible anytime and anywhere. Schoology's "Plasma" as a virtual classroom platform offers various digital learning features that enable students to develop Self-Regulated Learning (SRL). Through access to materials, discussions, and other digital learning resources, students are encouraged to be more active, independent, and able to plan, monitor, and evaluate their own learning process. SRL is an important internal factor that plays a role in learning success, because it encourages students to realize their learning needs without relying on direct direction from the teacher. This study is a classroom action research conducted by mathematics teachers at SMA Negeri 1 Gedongtataan, Pesawaran, Lampung, with 30 students of grade XII IPA 1 in the 2022/2023 academic year. Data were collected through questionnaires, observations, and interviews, then analyzed using descriptive statistics. The results showed that the use of Schoology's virtual classroom significantly improved students' SRL. The comparison of the average SRL scores in Cycle I and Cycle II, 2.7 and 3.2, respectively, indicates a consistent increase. This finding confirms that the integration of Schoology's virtual classroom is effective in enhancing students' learning independence at the secondary education level.
Pembuatan Kombucha dengan Berbagai Nutrisi
This study aims to analyze the effect of nutrient types on kombucha fermentation using Sosro Tea as a medium. The practicum was conducted with two variations, namely honey as a natural nutrient and Tropicana Slim as a low-calorie sweetener. Parameters observed included color changes, aroma, SCOBY layer formation, pH, and microbial contamination. The results showed that fermentation using honey produced the best combination, which was characterized by a brighter color change, a stable sour aroma, the formation of a thick and pure white SCOBY, and a stable pH of around 4. In contrast, fermentation using Tropicana Slim failed to achieve optimal results. This low-calorie sweetener cannot be metabolized by microbes, resulting in a thin SCOBY and the appearance of green-black mold. Based on these results, it can be concluded that the success of kombucha fermentation is greatly influenced by the availability of simple sugars, which are the main energy source for the SCOBY. In addition, the culture's resistance to microbial contamination also plays an important role in the fermentation process.
Model Probing Prompting dalam Upaya Meningkatkan Hasil Belajar Matematika pada Siswa Kelas XII MA Darusslam
This research is a classroom action research (CAR) conducted at MA Darussalam with the aim of improving mathematics learning outcomes through the application of the Probing-Prompting model. The subjects of this study were 26 grade XII students. Data collection was carried out using learning outcome tests given before and after the application of the learning model. The collected data were analyzed quantitatively and qualitatively. The results showed that the average score of students' learning outcomes in cycle I reached 82.38, while in cycle II it increased to 86.15. Based on the learning outcome completion category used, the achievement of students' mathematics learning outcomes in cycle I was 73.07%, and in cycle II it reached 100%. The application of the Probing-Prompting model has proven effective in increasing students' motivation and understanding of the material being taught. Thus, it can be concluded that the use of the Probing-Prompting model has a positive effect on improving students' mathematics learning outcomes, showing a significant increase in their understanding and skills in solving mathematics problems.
Pengaruh Model Probing Prompting terhadap Hasil Belajar Matematika Siswa Kelas VII SMP Islam Darusslam Kabupaten Gowa
This study is a quasi-experimental study that aims to determine the effect of the Probing-Prompting model on the mathematics learning outcomes of seventh-grade students of SMP Islam Darussalam. The sample in this study consisted of class VII-A which was used as an experimental class, which was taught using the Probing-Prompting model, and class VII-B which was used as a control class, which was taught using the lecture method. Based on the results of descriptive statistical analysis, it was found that the group taught with the Probing-Prompting model had learning outcomes categorized as moderate with an average value of 60.41, while the group taught with the lecture method had learning outcomes categorized as low with an average value of 42.94. The results of the inferential analysis showed a t_count value of 2.388, while the t_table was 1.69. This indicates that the Probing-Prompting model has a significant influence on improving students' mathematics learning outcomes, where students taught with the Probing-Prompting model showed higher learning outcomes compared to students taught with the lecture method.
Dari Limbah Menjadi Solusi: Inovasi Material Sisa Industri untuk Pengolahan Seng (Zn)
Zinc (Zn) is one of the most common heavy metal contaminants found in industrial wastewater and solid residues such as slag, electroplating waste, and metal ash. At excessive concentrations, Zn can cause environmental disturbances, including toxicity to aquatic organisms, disruption of microbial activity, and groundwater contamination. Long-term exposure may also lead to bioaccumulation and potential health risks to humans. This article presents a comprehensive literature review that discusses the chemical properties of Zn, its environmental behavior, and the development of recent treatment technologies within the last five years. Several techniques, including adsorption using modified or composite materials, biosorption utilizing microalgae and agricultural biomass, as well as solidification–stabilization with amendment agents such as biochar or iron-sulfide compounds, are evaluated and compared. The literature indicates that no single treatment method is universally effective for all waste types; therefore, hybrid or integrated treatment systems are considered more efficient and sustainable. Based on the reviewed evidence, this study proposes an engineering concept that emphasizes environmental safety, cost-effectiveness, and industrial applicability.
Model Regresi Nonparametrik Spline Truncated Pada Angka Kematian Bayi di Provinsi Nusa Tenggara Timur
This study aims to model the Infant Mortality Rate (IMR) in East Nusa Tenggara Province using truncated spline nonparametric regression. In this study, IMR is associated with four predictor variables: the percentage of poor people, the percentage of pregnant women under 19 years of age, low birth weight, and life expectancy. These four variables have an unpatterned relationship, indicating the presence of a nonparametric component in the model. The truncated spline regression method was chosen because of its ability to handle nonlinear relationships between variables. The results showed that the best model was obtained using three knot points, which produced a coefficient of determination (R²) of 97.47%. This indicates that the truncated spline regression model is able to explain 97.47% of the variation in IMR in East Nusa Tenggara Province. In addition, the four predictor variables have a significant influence on the model, making a significant contribution in explaining the factors that influence IMR in the region.
Bilangan Kromatik Lokasi Graf kubik C_(n,2n,2n,n) untuk n=3
Let G=(V(G),E(G)) be a connected graph and c be a coloring of the graph G. Let ∏={S_1,S_2,...,S_k }, where S_i is the class of colors in G which is colored i with 1≤i≤k. The representation of v with respect to Π is called a color code, denoted c_Π (v) is a k-element ordered pair, that is, c_∏ (v)=(d(v,S_1 ),d(v,S_2 ),...,d(v,S_k )), where d(v,S_i )=min{d(v,x)∣x ϵ S_i } for 1≤i≤k. If each vertex in G has a different color code then c is called a location coloring. The minimum number of colors used in the location coloring of a graph G is called the Location chromatic number with
Keanekaragaman Tumbuhan Paku di Kawasan Aliran Mata Air Panas Jaboi Kecamatan Sukajaya Kota Sabang
Biodiversity is essentially a reflection of the number of species and individuals inhabiting a community, as seen in the Pteridophyta group. These plants, which have evolved to have differentiated roots, stems, and leaves, play an important role in forest systems, primarily as protectors of the soil surface from the effects of erosion, in addition to contributing to the decomposition of organic matter that produces nutrients, and being a major part of the producer chain in the trophic structure. The Jaboi hot spring area, located in the Sukajaya District of Sabang City, exhibits unique ecological characteristics, influenced by the presence of the Jaboi volcano, which gives rise to geothermal phenomena such as fumarole activity, hot steam emissions, and the emergence of high-temperature water flows. This geothermal dynamic directly causes alterations in the physical and chemical conditions of the local soil, thereby shaping habitat characteristics and influencing the existence of vegetation, including ferns. To date, there is little scientific information available on the diversity of ferns in this area. Therefore, this study was conducted to examine and measure the diversity of ferns in the Jaboi hot spring area. The study was conducted in October 2025 using an exploratory survey approach to determine plots and purposive sampling techniques for field data collection. Diversity analysis was based on the Shannon-Wiener index (Ĥ) formula. Based on the identification results, 15 species of ferns from a total of 6 families and 433 individuals were found. The diversity index obtained (Ĥ=2.490171) indicates a moderate level.
Implementasi Pendekatan Deep Learning Melalui Si PONPEL untuk Meningkatkan Pemahaman Konsep Matematika di Sekolah Dasar
The purpose of this study was to evaluate the application of the Deep Learning approach in teaching mathematics in the first grade of addition and subtraction of numbers 1 to 20 in a story problem through the concrete media Si PONPEL and the educational game Quizizz Paper Mode. This technology-based learning is intended to make learning more interactive and enjoyable, but does not require personal digital devices. Qualitative and quantitative data were collected through a mixed-method research design to measure student understanding the result show that the Si PONPEL and Quizizz Paper Mode methods successfully improved students’ understanding of basic mathematical concepts, with an average increase in student scores of 38.33%. In addition, findings from interviews conducted with teachers and students showed that the Si PONPEL concrete media and this technology made students more engaged and motivated to learn. It is hoped that this research will make a significant contribution to creating more inclusive and interactive mathematics kearning in elementary schools.
Penerapan Minimun Spanning Tree dalam Penentuan Rute Objek Wisata di Kota Medan Menggunakan Algoritma Prim
The development of science and technology has encouraged the utilization of graph theory in solving optimization problems, particularly in transportation systems and tourism route planning. Medan City, as a metropolitan area with dense road networks and widely dispersed tourist destinations, faces challenges in selecting efficient travel routes. This research aims to determine the optimal route between tourist destinations in Medan City using the Minimum Spanning Tree (MST) method with Prim’s Algorithm. The research was conducted using a weighted graph modeling approach, where each tourist destination is represented as a vertex and the distance between destinations is represented as an edge weight. Distance data and estimated travel time were obtained through digital mapping using Google Maps and then analyzed through iterations of Prim’s Algorithm to produce a minimum spanning tree without forming cycles. The results show that all 23 tourist destinations are successfully connected in a single MST structure with a minimum total distance of 68.97 km and a travel time of approximately 199 minutes or 3 hours and 19 minutes. This model is expected to serve as a reference for tourism planning and support urban transportation efficiency based on mathematical computation.
Pengaruh Model Team Game Tournament terhadap Hasil Belajar Matematika Siswa Kelas VII SMPN 3 Bontang pada Materi Bilangan Rasional
The mathematics learning outcomes of students at SMP Negeri 3 Bontang on Rational Numbers are still relatively low. Data from the 2019 National Examination (UN) shows an average math score of 46.43, which is in the "poor" category. Summative assessment results indicate that most students have not yet achieved the Learning Objective Achievement Criteria (KKTP). This situation indicates that the learning process tends to be conventional and lacks active student engagement. Therefore, a more innovative learning model is needed, one of which is the Team Games Tournament (TGT), which combines group work, competition, and educational games. This study aims to determine the effect of the TGT learning model on the mathematics learning outcomes of seventh-grade students at SMP Negeri 3 Bontang in the topic of Rational Numbers. This study used a quantitative approach with a quasi-experimental type and a Posttest-Only Control Group Design. The study population was 203 seventh-grade students in the 2024/2025 academic year, with a sample consisting of class VII A as the experimental group (33 students) and class VII F as the control group (34 students), selected through a purposive sampling technique. The research instrument was a five-item essay test. The analysis results showed that the average posttest of the experimental group was 67.848, higher than the control group at 61.794. The Independent Sample t-Test produced a significance value of 0.031 <0.05, so H₀ was rejected. This indicates that the Team Games Tournament (TGT) learning model has a significant effect on improving students' mathematics learning outcomes in the Rational Numbers material.
Identifikasi dan Penanganan Gangguan Mesin Diesel melalui Pemeliharaan Korektif di PLTD Jayapura
Corrective maintenance is one of the maintenance strategies performed after system failures or malfunctions occur, particularly in diesel power plants (PLTD) that play a crucial role in supplying electricity to remote areas such as Jayapura. This study aims to identify the types of failures occurring in diesel engines at the Jayapura PLTD and to evaluate the corrective maintenance actions implemented. Data were collected through direct observation during an internship program, interviews with technicians, and analysis of historical maintenance and failure records. The results indicate that the most common failures occurred in the lubrication system, fuel system, and cooling system. Corrective actions included component repairs, spare part replacements, and system adjustments. The application of timely and appropriate corrective maintenance significantly reduced machine downtime and improved the reliability of the power generation system. This study recommends integrating corrective and preventive maintenance strategies to maximize operational efficiency of the PLTD.
Analisis Kadar Vitamin C dalam Cabai Rawit (Capsicum frutescens L.) Menggunakan Metode Titrasi Iodometri
Chili pepper (Capsicum frutescent L.) is known as one of the high sources of vitamin C, which acts as an important natural antioxidant for human health because the body is unable to produce its own. This study aims to analyse vitamin C levels in chili pepper using the iodometric titration method quantitatively by taking a 5 gram sample of chili pepper and titrating it using 0,1 N iodine solution. The analysis results showed that the vitamin C content obtained was 0,0704% or equivalent to 70,4 mg/100g. This value is higher than some research results. This value is higher than some previous research results on fruits and chillies from other regions. This finding shows that chilli pepper has great potential as a source of vitamin C in supporting the fulfilment of people’s daily nutrition. In addition, the iodometric titration method is proven to be effective and efficient to be used in the analysis of vitamin C in foodstuffs. Therefore, chili pepper consumption can be a simple strategy in improving nutritional and preventing disease related to vitamin C deficiency.
Pendekatan COPRAS dalam Penentuan Lokasi Supermarket
This research extends the previous work of Tsaqila, Winiarti, and Widaningrum (2024), who applied the Complex Proportional Assessment (COPRAS) method within a decision support system for supermarket branch location selection. Unlike the prior study, which focused on Ponorogo through a web-based framework, this study expands the implementation of COPRAS to the Medan Area, Medan Kota, Medan Polonia, dan Medan Maimun districts, adapting it to local urban, social, and economic characteristics. The main objective is to identify the most strategic site for a new supermarket by analyzing multiple criteria, including land cost, population density, accessibility, safety, cleanliness, and disaster risk. Data were collected from both field surveys and official government publications. The findings reveal that the COPRAS method provides reliable and objective assessments among the evaluated alternatives, with Medan Area emerging as the most suitable location for supermarket development. Overall, this study broadens the practical scope of the COPRAS method in a different regional context and reinforces its reliability and adaptability as a multi-criteria decision-making tool in the modern retail industry.
Estimasi Volume Air Hujan Menggunakan Metode Riemann untuk Mitigasi Banjir Musiman
Rainfall plays a crucial role in determining flood risk, particularly in regions with high precipitation intensity and limited drainage capacity. Langkat Regency in North Sumatra is one of the areas frequently affected by seasonal flooding. This study aims to model the spatial distribution of rainfall and estimate the rainwater volume using the double integral approach as a basis for flood mitigation planning. Monthly rainfall data from various observation stations in 2024 were processed to obtain the average rainfall intensity, which was then converted into meters and multiplied by the total area of Langkat Regency to compute the rainwater volume. The results indicate that the total estimated rainwater volume throughout 2024 reached 16,409,819,800 m³, with peak precipitation occurring from September to November, contributing significantly to the increasing flood risk in low‐lying zones and riverine areas. These findings demonstrate that the use of double integrals is an effective quantitative method for predicting potential flood volume based on rainfall distribution. The outcomes of this study are expected to serve as a scientific reference for local governments in developing data-driven flood mitigation strategies, such as improving drainage capacity, constructing retention basins, and strengthening watershed management.
Penerapan Model Pembelajaran Flipped Classroom Berbasis Video Animasi dalam Meningkatkan Minat Belajar Siswa di SMPN 1 SANROBONE
This study aims to analyze the implementation of video animation-based flipped classroom learning model in increasing students' learning interest in science subjects with material on the structure and function of living organisms in class 8D at SMPN 1 Sanrobone. The low interest in learning science among students is a major problem that needs to be addressed through more attractive and interactive learning innovations. The video animation-based flipped classroom model was chosen because it can optimize classroom learning time for more meaningful activities, while basic concept understanding is done independently through engaging animated videos. This study uses a survey method with a descriptive quantitative approach. The research subjects were students of class 8D SMPN 1 Sanrobone in the even semester of the 2024/2025 academic year. Research instruments used learning interest questionnaires, observations, and documentation. The results showed that the implementation of video animation-based flipped classroom model was able to increase students' learning interest with high categories in aspects of attention, interest, involvement, and learning satisfaction. Animated videos presented before face-to-face learning provide clear visualizations of the structure and function of living organisms, making students more prepared and enthusiastic to participate in discussions and practical activities in class. This learning model also encourages student learning independence and increases active interaction in learning. This study recommends the implementation of video animation-based flipped classroom as an alternative effective and innovative science learning strategy to increase students' learning interest.
Implementasi Kurikulum Merdeka melalui Integrasi CP, TP, dan ATP dalam Meningkatkan Kualitas Pembelajaran dan Profesionalisme Guru
This study discusses the implementation of the Self-Directed Learning Programme by integrating Learning Outcomes (CP), Learning Objectives (TP), and Learning Objective Processes (ATP) to enhance teaching quality and teacher professionalism. Using a library research method, this study analyses relevant scientific literature to understand the relationship between the integration of the three components of the education programme and classroom teaching practices. The research findings indicate that teachers still encounter challenges in understanding and integrating CP, TP, and ATP, particularly in planning, implementing teaching strategies, and conducting authentic assessments. However, when this integration is well executed, the teaching process becomes more purposeful, flexible and responsive to students' needs. Furthermore, integrating CP–TP–ATP has been shown to strengthen teachers' professionalism by enhancing their understanding of the curriculum, their ability to design learning activities, and their capacity to conduct competency-based assessment. This study confirms that the successful implementation of the Free Education Programme depends heavily on teachers' ability to understand the curriculum's structure and to integrate these three components consistently. Therefore, training, supporting, and developing teachers' competencies is an important requirement for the effective and sustainable implementation of the Liberal Education Programme.
Pengaruh Penerapan Ice Breaking terhadap Hasil Belajar Matematika pada Materi Barisan dan Deret Aritmatika Siswa Kelas X
Low student achievement in mathematics, particularly in arithmetic sequences and series, has led to decreased learning motivation and participation. Therefore, innovative and engaging instructional strategies are required, one of which is the implementation of ice-breaking activities to reduce boredom and enhance students’ learning engagement. This study aimed to examine the effect of implementing ice breaking on the mathematics learning outcomes of tenth-grade students at SMK Kesehatan Samarinda in the topic of arithmetic sequences and series. This research employed an experimental method using a quasi-experimental design, involving two groups: an experimental group that received instruction incorporating ice breaking and a control group that did not receive such treatment. The total sample consisted of 60 students selected through purposive sampling. The research instrument was a learning achievement test administered as a pretest and posttest. Data were analyzed using a paired sample t-test to determine differences in learning outcomes between the two groups. The results revealed a significance value of 0.000 (< 0.05), indicating a significant difference in learning outcomes between the experimental and control groups. Therefore, it can be concluded that the implementation of ice breaking has a significant effect on improving students’ mathematics learning outcomes. This strategy creates a more active, interactive, and enjoyable learning environment, thereby facilitating students’ understanding of mathematical concepts, particularly arithmetic sequences and series.
Karakteristik Uji Gramatur dan Daya Regang pada Kertas Berbahan Kulit Ubi dan Fiber Sawit
The increasing demand for paper has led to a shortage of wood-based raw materials, thus requiring environmentally friendly alternatives. This study aims to analyze the physical, mechanical, and morphological characteristics of paper made from cassava peels (Manihot esculenta Crantz) and oil palm fruit fibers (Elaeis guineensis Jacq.) as eco-friendly paper raw materials. The research method involved pulp preparation through delignification using 3.5% HNO₃ and 3% NaOH, bleaching with 10% H₂O₂, paper sheet formation with varying compositions (A = 70:30, B = 50:50, C = 30:70, D = 10:90), followed by grammage testing and tensile strain testing. The results showed that the grammage values ranged between 96.3–99.7 g/m², while tensile strain ranged between 2.6–4.4%. The study concluded that the best composition was found in sample C (30% cassava peel : 70% palm fiber) with a grammage of 98.5 g/m² and tensile strain of 3.2%. The implication of this study is that cassava peel and palm fiber waste have the potential to serve as alternative paper raw materials that meet the quality standards of A-grade printing paper (SNI 7274:2008), while also supporting the reduction of dependence on wood.
Analisis Keterampilan Proses Sains Mahasiswa Pendidikan Biologi melalui Kegiatan Praktikum Histologi
Histology practicum, as one of the compulsory practicum courses, offers a great opportunity to practice various aspects of science process skills through microscopic tissue observation activities, identification of cell and tissue structures, and analysis of tissue functions in organisms. This study aims to analyze the science process skills biology education students through histology practicum activities. This study uses a quantitative descriptive approach with a survey method to analyze the science process skills of biology education students through histology practicum activities. Data collection in this study used three main techniques, namely science process skills tests, direct observation, and analysis of practicum report documents. Furthermore, the data were analyzed descriptively quantitatively using descriptive statistics to describe the profile of students' science process skills. Analysis per aspect revealed that students had good skills in the aspects of observing (78.50%), classifying (76.33%), interpreting data (71.67%), applying concepts (73.25%), and communicating results (73.40%), which indicates that histology practicum is effective in developing basic science process skills. However, the aspects of formulating hypotheses (58.17%) and planning experiments (54.83%) were still in the sufficient category, indicating that students experienced difficulties in integrated science process skills that require higher-order thinking skills. The findings this study provide important implications for the development of more comprehensive histology practicum learning strategies, including the integration of inquiry approaches, the use of continuous formative assessment, the application of differentiated learning, and strengthening the connection between theory and practice to optimize the development of all aspects of science process skills of prospective biology teachers.
Kombinasi Eco-Enzim Kulit Buah dan Tanaman Bintang Air dalam Mengurangi Kandungan Surfaktan dalam Air Limbah
The discharge of surfactant-laden wastewater from the rapidly expanding laundry industry poses significant environmental risks, especially in densely populated urban areas. While constructed wetlands (CWs) and Eco-Enzyme technology have shown promise for surfactant remediation, their standalone application requires long hydraulic retention times (HRTs), limiting practical implementation. This study evaluated the efficacy of a novel integrated system combining a subsurface constructed wetland (SSFCW) with fruit peel-derived Eco-Enzyme to treat synthetic laundry wastewater. Over a 6-day treatment period, the combined system achieved a remarkable surfactant removal efficiency of 99.63%, reducing the concentration from 225 mg/L to 0.835 mg/L—well below the regulatory threshold of 3 mg/L. The synergistic degradation mechanism involves enzymatic hydrolysis via Eco-Enzyme lipase and protease activity, complemented by microbial mineralization in the wetland rhizosphere. This system maintains optimal environmental conditions, with a stable pH of 6.85-7.32 and a temperature of 30.9-35.2°C, supporting robust biological activity. These findings demonstrate that the integrated Eco-Enzyme/SSFCW system overcomes the limitations of conventional HRT approaches, offering a highly efficient, sustainable, and practical decentralized wastewater treatment solution for the laundry industry.
Evaluasi Komprehensif Kualitas Briket dari Arang Tempurung Kelapa dan Campuran Serbuk Gergaji Sengon Terkarbonisasi/Tidak Terkarbonisasi
This study comprehensively evaluates the quality of biomass briquettes produced from blends of coconut shell charcoal and sengon sawdust, using both carbonized and non-carbonized materials. Composite briquettes were fabricated with varying compositions and characterized through proximate analysis, calorific value, density, and burning rate measurements to determine their suitability as solid fuel. The results indicate that adding non-carbonized sawdust increases volatile matter content and burning rate but reduces the calorific value of the briquettes. In contrast, incorporating up to 10% carbonized sawdust significantly improves the calorific value to 6119.2 cal/g, approaching that of pure coconut shell charcoal (6352.2 cal/g), while maintaining a relatively high burning rate. Briquettes containing carbonized sawdust also exhibit low ash content, below 3%, and moisture content under 8%, meeting standard solid fuel quality requirements. These findings demonstrate that a strategic combination of carbonized and non-carbonized materials can produce hybrid biomass briquettes with optimized thermal performance, providing a promising, sustainable, and environmentally friendly alternative fuel for domestic and industrial applications.
Perkembangan Material Barium Heksaferrit Doping Lantanum sebagai Penyerap Gelombang Elektromagnetik: Tinjauan Literatur
The development of lanthanum-doped barium hexaferrite materials has attracted considerable attention in the field of functional materials, particularly as electromagnetic wave absorbers. This literature review aims to analyze advances in synthesis methods, structural characteristics, magnetic properties, and electromagnetic absorption performance of lanthanum-doped barium hexaferrite reported in various studies. Synthesis techniques such as sol–gel, coprecipitation, solid-state reaction, and hydrothermal methods are compared to evaluate their effects on crystallite size, morphology, and phase purity. Lanthanum doping is known to modify lattice parameters, reduce coercivity, and enhance complex permittivity and permeability, which play crucial roles in absorption mechanisms. Furthermore, variations in dopant concentration significantly influence reflection loss values and effective absorption bandwidth. The reviewed literature indicates that optimization of composition and synthesis routes can produce materials with high absorption capability, good stability, and strong potential for application in electromagnetic interference mitigation devices. This review is expected to serve as a conceptual reference for future development of lanthanum-doped barium hexaferrite–based electromagnetic wave absorbing materials. The comparative approach also highlights research challenges, industrial application opportunities, and future research directions relevant to the evolving demands of modern communication and defense technologies at both national and global levels.
Aktivitas Inhibisi Xantin Oksidase dan Antioksidan Ekstrak Etanol Daun, Batang, serta Kombinasinya dari Serai (Cymbopogon citratus) secara In Vitro
Lemongrass (Cymbopogon citratus) is a plant known to contain various bioactive compounds with potential antioxidant properties as well as xanthine oxidase (XO) inhibitory activity. This study aimed to evaluate the phytochemical content, antioxidant activity, and XO inhibitory potential of ethanol extracts from the leaves, stems, and their combination. Phytochemical screening revealed that all extracts contained alkaloids, flavonoids, and terpenoids, while phenolic compounds were detected only in the leaf extract and the combined leaf–stem extract. Antioxidant activity assays demonstrated that all extracts exhibited very strong antioxidant activity, with IC₅₀ values below 50 ppm, indicating a significant potential to scavenge free radicals. In the XO inhibition assay at a concentration of 200 ppm, the ethanol extract of lemongrass stems showed the highest inhibitory activity at 81.37%, followed by the leaf extract at 48.08% and the combined leaf–stem extract at 33.65%. Overall, these findings suggest that the ethanol extract of lemongrass stems is the most promising natural source of antioxidants and has the greatest ability to inhibit xanthine oxidase activity, indicating its potential development as a functional ingredient for health applications.
Adsorpsi Selektif Ion Cd2+ Menggunakan Silika Mesopori MCM-48-NH2
The danger of cadmium contamination in water sources remains a crucial environmental issue due to its persistent nature and high toxicity level, which poses serious risks to human health and ecosystems. Cadmium is a non-biodegradable heavy metal that can accumulate in living organisms over time. The presence of these toxic Cd²⁺ ions is known to trigger damage to vital organs such as the liver and kidneys; therefore, reducing their concentration in aquatic environments is of paramount importance for environmental protection and public health safety. Among various treatment methods, adsorption is considered one of the most effective and economical techniques for removing heavy metal ions from contaminated water. In this study, the capability of mesoporous silica MCM-48-NH₂ as an adsorbent for Cd²⁺ ions was systematically evaluated. The adsorption performance was examined by investigating several important parameters, including contact time, solution acidity level (pH), and initial Cd²⁺ concentration. Furthermore, the adsorption mechanism and interaction between Cd²⁺ ions and the adsorbent surface were analyzed using Langmuir and Freundlich isotherm models. The results demonstrate that the adsorption process of Cd²⁺ ions onto MCM-48-NH₂ tends to follow the Langmuir isotherm model, indicating monolayer adsorption behavior, with a maximum adsorption capacity of 0.66 mmol g⁻¹.
Kajian Massa Jenis Bahan Bakar Minyak dari Pengolahan Sampah Plastik dengan Pirolisis
Processing plastic waste into fuel oil with pyrolysis technology. Research on plastic oil as an alternative fuel has been widely conducted. One of them is research on processing plastic bag waste into fuel oil with pyrolysis technology. In this study, a set of pyrolysis equipment was made by Lecturers and Students of UMNU Kebumen. The plastic waste used in this study was 1 kg of plastic bag. Meanwhile, the pyrolysis process used a temperature of 250oC-300oC. The fuel oil produced in the pyrolysis process of this study was approximately 400 ml. The average density of fuel oil from plastic bag waste was 0.733 gr/ml. The results of this density calculation are in the possibility of the density of gasoline, namely 0.710 gr/ml to 0.770 gr/ml. This pyrolysis process shows great potential for converting plastic waste into an environmentally friendly alternative energy source. Furthermore, the efficiency of this pyrolysis technology can be improved by adjusting the temperature and processing time, as well as by selecting a wider variety of plastic types. This technology has the potential to be applied more widely in plastic waste management within the community as a solution to reduce environmental pollution while generating renewable energy.
Transformasi Ilmu Hayati melalui Pendekatan Bioteknologi Modern
The development of modern biotechnology has brought fundamental changes to the life sciences through the application of molecular biology, genetic engineering, and bioinformatics techniques. This article aims to examine the transformation of life sciences through modern biotechnology approaches and its impact on health, agriculture, the environment, and industry. The method used is a descriptive-analytical literature review based on international journal sources and relevant scientific publications. The results of the study indicate that technologies such as CRISPR-Cas9 enable precise gene editing for genetic disease therapy, while the mRNA vaccine platforms developed by Pfizer and Moderna demonstrate the acceleration of biomedical innovation in response to the global pandemic. In the agricultural sector, genetic engineering increases crop productivity and resilience, while in the environmental sector, biotechnology supports environmentally friendly bioremediation processes. However, ethical and regulatory challenges remain important concerns in its implementation. In conclusion, modern biotechnology plays a key role as a catalyst for sustainable, innovation-driven transformation in the life sciences.