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The use of local raw materials in Nile tilapia feed formulation needs to be developed to reduce dependence on increasingly expensive conventional feed ingredients. This study aimed to analyze the effect of different formulations of chicken feather meal and moringa leaf meal with turmeric addition as a phytobiotic on the chemical composition of Nile tilapia (Oreochromis niloticus) feed. The study used a completely randomized design with three treatments and three replications. P1 consisted of 55% chicken feather meal, 25% moringa leaf meal, 5% turmeric, 10% corn flour, and 5% starch; P2 consisted of 40% chicken feather meal, 40% moringa leaf meal, 5% turmeric, 10% corn flour, and 5% starch; and P3 consisted of 25% chicken feather meal, 55% moringa leaf meal, 5% turmeric, 10% corn flour, and 5% starch. The parameters analyzed were crude protein, moisture, ash, crude lipid, crude fiber, and carbohydrate. Data were analyzed using analysis of variance followed by the least significant difference test when significant differences occurred. The results showed that P3 produced the highest protein content (22.60%), ash content (6.65%), crude fiber (6.55%), and carbohydrate (8.45%), whereas P2 produced the highest lipid content (6.54%). Based on chemical analysis, P3 was the most prominent formulation for most proximate parameters. However, this formulation cannot be directly concluded as the best feed for fish growth because digestibility, palatability, feed conversion ratio, growth, survival, and health responses were not evaluated. Further biological testing is therefore required to confirm its feasibility for Nile tilapia culture.

Background: Class II restoration according to the classification of Greene Vardiman Black is one of the procedures in dental conservation that often presents a challenge for operators or dentists during treatment. Class II restorations have their own level of difficulty, particularly during the placement of restorative materials into the cavity. One of the possible failures in Class II restorative treatment is marginal leakage, which can lead to microleakage at the restoration margins. Purpose: To report the success of class II restoration with composite resin using tofflmire matrix. Case report: A 23-year-old female patient came with a complaint of cavities, the complaint was felt since 1 year ago in the lower left back tooth, there was no pain and had never been treated. In the case, preparation and restoration were carried out using composite resin with isolation using tofflmire matrix, applied using an Incremental technique. Discussion: Class II posterior tooth restorations have challenges such as leakage due to the techniques and materials used. Composite resin is chosen because of its good adaptation, esthetics, and wear resistance. Incremental techniques are preferred because they reduce polymerization stress and provide optimal curing results. Tofflemire matrix is ​​used for stability and soft tissue protection.Conclusion: The selection of composite resin with an Incremental technique and the use of a Tofflemire matrix provides more optimal, aesthetic, and minimal risk of failure results for class II posterior tooth restorations.

Low-rank coal generally has a high moisture content, which results in a low calorific value and suboptimal quality for utilization as an energy source. One method that can be applied to improve coal quality is the Upgrading Brown Coal (UBC) process, which functions to reduce moisture content and increase fixed carbon value. This study aims to analyze the effect of heating time and the ratio of used oil composition on improving coal quality based on proximate parameters. The research method includes collecting coal samples from four locations in Samarinda and its surrounding areas, namely SMAN 1 Samarinda, Bhineka Street, Palaran Stadium, and Tani Bakti Village. The samples were analyzed using proximate analysis, including inherent moisture (IM), ash content (AC), volatile matter (VM), and fixed carbon (FC), both before and after the UBC process. The upgrading process was carried out with variations in heating time and used oil composition as a coating medium to enhance coal stability and prevent moisture reabsorption. The final results of the upgrading process showed the best values of inherent moisture at 13.64%, ash content at 4.66%, volatile matter at 55.06%, and fixed carbon at 44.94%. The results indicate that the UBC process is capable of reducing inherent moisture and increasing fixed carbon, thereby improving coal quality. Variations in heating time and used oil composition have a significant effect on changes in proximate parameters. Longer heating time and an appropriate ratio of used oil composition result in a more optimal improvement in coal quality.

The farmer empowerment program in Dilem Village, Gondang District, was implemented through training on the production of solid compost based on livestock manure as an effort to enhance the independence and agricultural productivity of the local farming community. This training was designed to utilize local resources through a village potential–based approach that emphasizes the optimization of livestock waste and organic materials available in the surrounding environment. The implementation methods included socialization activities, material delivery, hands-on practice in compost production, and post-training assistance to ensure the sustainability of technology application at the farmer level. The results of the program indicated an increase in farmers’ knowledge and skills in the compost-making process, enabling them to produce organic fertilizer independently and reduce dependence on chemical fertilizers. This program also had a positive impact on soil quality, production cost efficiency, environmental cleanliness, and supported environmentally friendly and sustainable agricultural practices. Thus, this training activity contributes to strengthening the local economy, improving farmers’ welfare, and developing a sustainable agricultural system based on local resources in Dilem Village in a continuous and practical manner.

The creation of institutional signature music is typically understood as a technical compositional process intended to accompany a performance. This study aims to elucidate how the music of the Rene Hu dance is constructed as a medium for representing institutional identity through the integration of local wisdom and organizational values. Utilizing an artistic autoethnographic approach, this research positions the creative experience of the composer as a reflective data source analyzed through both thematic and conceptual lenses. The findings indicate that the composition of Rene Hu music emerges from the interaction of cultural, ecological, and institutional dimensions, all mediated by the composer’s reflection as a strategic agent. The integration of Sentani traditions, the soundscape of Mount Cycloop, and digital technology forms a sonoric identity that represents both cultural legitimacy and the vision of the Papua Province Language Center. This study formulates the Reflective Sonoric Cultural Strategy Model, which explains the mechanisms of identity negotiation within the composition of such signature music. The novelty of this research lies in its conceptualization of institutional music as an arena for identity negotiation analyzed through the composer’s creative journey. This research offers a conceptual framework applicable to the creation of similar representational musical works.

Natural fiber based composite materials are increasingly being developed as an environmentally friendly alternative to synthetic fiber-based composites. This study aims to characterize the thermal and mechanical properties of natural fiber composite materials and evaluate their potential use as sustainable materials. Composites are made using natural fibers as reinforcement and a polymer matrix through a specific molding method. Mechanical property characterization includes tensile tests, flexural tests, and impact tests, while thermal property characterization is carried out using thermal analysis to determine the thermal stability of the material. The test results show that the addition of natural fibers has a significant effect on improving the mechanical properties of the composite, especially tensile strength and elastic modulus, compared to the unreinforced matrix. In addition, natural fiber composites show quite good thermal stability over a certain temperature range, making them suitable for non-structural applications. Based on these results, natural fiber composite materials have the potential to be developed as environmentally friendly materials that have competitive mechanical and thermal performance.

Cassava is one of the strategic agricultural commodities in Indonesia, contributing significantly to national production, particularly in several major producing provinces. In addition to the challenge of declining harvested areas, cassava processing activities also generate agricultural waste that poses environmental risks. In Purwasari Village, Dramaga Subdistrict, Bogor Regency, household-scale cassava processing industries produce solid waste in the form of cassava peels, which are not optimally managed and are commonly discarded in the surrounding environment. This cassava waste has the potential to cause environmental pollution, unpleasant odours, and negative impacts on public health. One sustainable alternative for managing this cassava waste is the use of cassava peels as a raw material for composting. This study aimed to identify problems associated with cassava peel waste and to assess members of the Taruna Tani Millennial Farmer Group's interest in compost production using cassava peels. The research was conducted from December 2024 to June 2025 using a community-based assistance approach. Data was collected through interviews and questionnaires involving 20 respondents. The results showed that the main problems associated with cassava peel waste include waste accumulation, limited processing facilities, and low community awareness. Farmers’ interest in cassava peel composting was generally categorized as high, with an average score of 77%, although several indicators remained at a moderate level. Extension activities and hands-on demonstrations were proven to enhance farmers’ understanding, interest, and participation. With sustained educational support and adequate facilities, the use of cassava peel compost has strong potential to promote environmentally friendly, sustainable agricultural waste management.

Japanese kale (Brassica oleracea) is a leafy vegetable with high nutritional and economic value and strong potential for development through intensive cultivation systems, including polybag-based cultivation. Fertilization is an important factor determining plant growth success. This study aimed to analyze differences in the effects of cattle-manure compost fertilizer and NPK Mutiara fertilizer on the vegetative growth of Japanese kale, as well as to evaluate their roles in maintaining growing media fertility. The research employed a quantitative experimental approach using a single-factor Completely Randomized Design (CRD), namely fertilizer type. Treatments consisted of cattle-manure compost fertilizer and NPK Mutiara fertilizer, each with twelve replications, resulting in twenty-four experimental units. Observed parameters included plant height, leaf width, and growing media pH. The results showed that NPK Mutiara fertilizer produced better plant height and leaf width than compost fertilizer, particularly during the vegetative phase. This advantage was associated with the rapid availability of macronutrients such as nitrogen, phosphorus, and potassium for plant uptake. Meanwhile, cattle-manure compost fertilizer contributed to stabilizing growing media pH and improving soil physical and biological conditions. pH values in both treatments remained within the optimal range and did not limit plant growth. Therefore, NPK Mutiara fertilizer is more effective for short-term vegetative growth enhancement, whereas compost fertilizer supports sustainable growing media fertility.

Perubahan pola hidup masyarakat modern yang diiringi tingginya beban kerja dan mobilitas, telah meningkatkan risiko stres serta kelelahan fisik dan mental, terutama di kawasan perkotaan yang padat seperti Surabaya. Hal ini mendasari kebutuhan akan fasilitas yang tidak hanya berfokus pada perawatan fisik, namun juga mendukung pemulihan secara menyeluruh. Perancangan Wellness and Beauty Center dengan menerapkan Biophilic Architecture dapat menghadirkan ruang penyembuhan yang terintegrasi dengan alam. Proses perancangan meliputi tahapan identifikasi, studi banding, analisis, dan sintesis, guna menghadilkan konsep makro Healing Trough Nature sebagai strategi utama. Konsep ini dikembangkan menajdi konsep mikro yang mencakup desain ruang interaksi dengan alam, bentuk bangunan organik, dan tatanan lahan yang menyatu dengan lansekap di sekitarnya. Rancangan yang dihasilkan meliputi fasilitas spa, perawatan kecantikan, yoga, meditasi, pusat kebugaran, dan area relaksasi yang terhubung secara efektif. Bangunan dirancang adaptif terhadap karakter tapak dengan komposisi massa lengkung yang selaras terhadap orientasi visual dan fungsi ruang, sehingga mampu emnciptakan harmoni serta atmosfer yang dapat menennagkan bagi pengunjung.

The novel Time and Southeast by L. Dela Fimeta, published on October 2, 2023, is one of the literary works in the romance genre that is interesting to study from a linguistic perspective, especially morphology. This study aims to analyze the morphological process of composition contained in the novel, focusing on the types, examples, and semantic aspects that arise in the use of word composition. The research method used is qualitative descriptive analysis with a literature review approach and text review. Data in the form of compositional words were collected from novel texts, then classified based on the type of composition, such as endocentric, exocentric, and idiomatic compositions. Semantic analysis is carried out to examine the meaning resulting from the composition process, both literal and connotative meanings that enrich the nuances of romance in the novel. The results of the study show that this novel uses word composition creatively to build aesthetic expression, strengthen characterization, and present a distinctive emotional nuance. The semantic aspects of word composition also contribute to the development of deep themes and language styles. In conclusion, the morphological study of composition in the novel Time and Southeast makes an important contribution to the development of morphological studies while enriching literary research that integrates language analysis in literary works.

The increasing need for insulation in electric power systems encourages the discovery of high-performance and sustainable dielectric materials. This study presents a Literature Review of biomass-based composite insulator research from 2018-2025 to synthesize the effect of filler type and treatment on the electrical, thermal, and mechanical properties of polymer composites. Literature was analyzed from reputable databases with inclusion criteria, and thematic analysis data extraction. Processing methods generally include washing, acid/alkali treatment, calcination, and advanced production techniques such as sol-gel and ultrasonication, integration of biomass fillers especially at low fractions (3-7%). The results show 1) the dominance of the use of rice husk as a source of biosilica for the main matrix filler of the insulator. 2) the performance of biomass composite insulators is highly dependent on the quality of purification, particle size, and surface modification of the filler. 3) there is a significant increase in the insulator's breakdown strength, resistivity, and thermal stability with the addition of biomass fillers to the main matrix. 4) the long-term stability of biomass materials against humidity and thermal aging has not been evaluated in depth.  

Leaf springs serve as vehicle weight supports and vibration dampers from uneven roads. Reducing vehicle weight can support fuel consumption reduction. The use of composite materials allows for a reduction in leaf spring weight without reducing load capacity and stiffness. The purpose of this study was to find the composition of composite leaf springs with a polyurethane matrix that were resistant to tensile and flexural tests using e-glass, epoxy, and polyurethane materials. This study used an experimental method, in which specimens were tested using a tensile and flexural testing machine. The variations included polyurethane matrices of 10%, 20%, and 30%. The data was statistically analyzed using Excel to determine the significant effect of the variables. The results showed the effect of polyurethane variation on the composite. The tensile test showed that the greatest tensile stress was on the 30% polyurethane specimen at 1.574 N/mm² and the smallest was on the 10% specimen at 7.007 N/mm². In the flexural test, the greatest effect on flexural strength was observed in the 30% specimen at 14.36 MPa and the smallest in the 10% specimen at 25.82 MPa. Without the addition of polyurethane, the tensile stress was 39.678 N/mm² and the flexural strength was 157.09 MPa. Conclusion: The addition of polyurethane reduces the mechanical strength of composite leaf spring material without polyurethane addition.

Composite materials have the potential to be used as an alternative material for e-scooter frames due to their low weight and good mechanical strength. The mechanical properties of composite materials are strongly influenced by their constituent materials, particularly the fiber fraction. This study aims to analyze the effect of fiberglass composition variations on the tensile strength of composite materials as an alternative for e-scooter frames. The results show that increasing the fiberglass content leads to an improvement in the tensile strength of the composite material. The tensile strength increased by 51.52% when the fiberglass content was increased from 40% to 50%, while an increase of 19.5% was observed from 50% to 60%, indicating a decreasing rate of improvement. At higher fiberglass compositions, voids were observed due to imperfections in the manufacturing process, which affected the bonding between the fiber and the resin. In addition, increasing the fiberglass content resulted in a reduction in tensile strain from 1.1% at 40% fiberglass to 0.55% at 60% fiberglass, indicating that the material became stiffer and more brittle. These results indicate a trade-off between increased tensile strength and reduced ductility of the composite material.

Leaf springs serve as vehicle weight supports and vibration dampers from uneven roads. Reducing vehicle weight can support fuel consumption reduction. The use of composite materials allows for a reduction in leaf spring weight without reducing load capacity and stiffness. The purpose of this study was to find the composition of composite leaf springs with a polyurethane matrix that were resistant to tensile and flexural tests using e-glass, epoxy, and polyurethane materials. This study used an experimental method, in which specimens were tested using a tensile and flexural testing machine. The variations included polyurethane matrices of 10%, 20%, and 30%. The data was statistically analyzed using Excel to determine the significant effect of the variables. The results showed the effect of polyurethane variation on the composite. The tensile test showed that the greatest tensile stress was on the 30% polyurethane specimen at 1.574 N/mm² and the smallest was on the 10% specimen at 7.007 N/mm². In the flexural test, the greatest effect on flexural strength was observed in the 30% specimen at 14.36 MPa and the smallest in the 10% specimen at 25.82 MPa. Without the addition of polyurethane, the tensile stress was 39.678 N/mm² and the flexural strength was 157.09 MPa. Conclusion: The addition of polyurethane reduces the mechanical strength of composite leaf spring material without polyurethane addition.

Composite materials have the potential to be used as an alternative material for e-scooter frames due to their low weight and good mechanical strength. The mechanical properties of composite materials are strongly influenced by their constituent materials, particularly the fiber fraction. This study aims to analyze the effect of fiberglass composition variations on the tensile strength of composite materials as an alternative for e-scooter frames. The results show that increasing the fiberglass content leads to an improvement in the tensile strength of the composite material. The tensile strength increased by 51.52% when the fiberglass content was increased from 40% to 50%, while an increase of 19.5% was observed from 50% to 60%, indicating a decreasing rate of improvement. At higher fiberglass compositions, voids were observed due to imperfections in the manufacturing process, which affected the bonding between the fiber and the resin. In addition, increasing the fiberglass content resulted in a reduction in tensile strain from 1.1% at 40% fiberglass to 0.55% at 60% fiberglass, indicating that the material became stiffer and more brittle. These results indicate a trade-off between increased tensile strength and reduced ductility of the composite material.

This study aimed to analyze differences in body composition among adult women across three regions with distinct sociocultural and environmental characteristics: Baduy Luar (rural–traditional), Salatiga (semi-urban), and Kota Bambu (urban). Using a cross-sectional design, the study involved 268 participants and assessed total body fat, visceral fat, subcutaneous fat, and skeletal muscle mass using the OMRON HBF-370 analyzer. Significant differences were observed across most body composition parameters (p < 0.001). Women living in the urban area exhibited the highest levels of total fat, visceral fat, and subcutaneous fat, reflecting the influence of urbanization and sedentary lifestyle on adiposity. Conversely, women in the rural–traditional community demonstrated the highest skeletal muscle mass across all body regions, consistent with their physically demanding daily activities and traditional dietary patterns. These findings highlight the substantial role of environmental context in shaping metabolic health and cardiometabolic risk. Targeted public-health interventions—such as structured physical-activity promotion and nutrition education in urban populations, and preservation of active lifestyles in rural communities—are recommended. Longitudinal studies are warranted to clarify causal pathways and further characterize metabolic determinants.

This paper was made to explain the results of research on how to obtain the most appropriate citric acid adhesive composition in the manufacture of randu wood fiber composites in order to obtain a strong and suitable composite material. The research was carried out by experimental methods in the laboratory through a series of mechanical tests, namely the bending strength test and the screw grip strength test. The sample specimen is 5 cm × 20 cm × 1 cm for flexural strength testing and 5 cm × 10 cm × 1 cm for screw grip strength test. Composite specimens were made with variations in the composition of citric acid adhesives of 2.5%, 5%, 7.5%, 10%, 12.5%, 15%, 17.5%, and 20% by weight of randu wood. The results showed that the composite of randu wood particles with a citric acid matrix had optimal strength at a certain ratio, which was 7.5%. At the same ratio, the test results of the screw grip strength test also provide the highest value. These findings confirm that the exact composition of the adhesive has a significant impact on the final performance of the resulting composite.

This study aims to analyze the comparison of the durability of natural fiber and synthetic fiber composites in a high-temperature production environment. Testing was conducted on carbon fiber, aramid (synthetic), ramie, and jute (natural) fiber-based composites with exposure to temperatures of 80-150°C for 500 hours. The parameters measured include tensile strength, elastic modulus, dimensional stability, morphological changes, and moisture absorption. The research results show that synthetic fiber composites have superior durability compared to natural fibers. Carbon fiber composites retain 87% of their initial tensile strength with only a 4.2% reduction in modulus, while flax fibers only retain 62% strength with a 26% reduction in modulus. Microscopic analysis revealed significant delamination in natural fiber composites with interface gaps of 15-25 μm, compared to 3-5 μm in synthetic fibers. Natural fibers undergo thermal degradation due to the decomposition of lignin and hemicellulose, resulting in significant color changes and a dimensional shrinkage of 3.2%. The moisture absorption of natural fibers increases to 8.5% after exposure, indicating damage to the cellular structure. This research concludes that synthetic fiber composites are more suitable for long-term high-temperature production applications, but natural fibers can still be considered for low-temperature applications with appropriate chemical modification.

Seagrass beds are coastal ecosystems that have important ecological functions as a provider of habitat, food sources, protection, and reproductive areas for various marine life including Echinoderms. This study aims to analyze the diversity of Echinoderms and their relationship with seagrass distribution in Kiama Beach, Melonguane District, Talaud Islands Regency. The research was conducted in the intertidal zone at three stations using the exploration method with purposive sampling technique. Each station is divided into three plot installation zones measuring 4 × 4 meters, with observations made at low tide. Environmental parameters (temperature and pH), type and number of Echinoderm individuals, and seagrass species were recorded and analyzed using the Shannon-Wiener diversity index and product moment correlations. The results showed that the Echinoderma community consists of two classes and five species: Archaster typicus, Linckia laevigata, Culcita novagueniae, Holothuroidea scabra, and Holothuroidea forskali, with the Asteroidea class dominating (75%). The diversity index (H') value was relatively low at all stations with a range of 0.6261–0.6631. Seagrass beds consist of five species, namely Halophila ovalis, Cymodocea rotundata, Thalassia hemprichii, Halodule uninervis, and Syringodium isoetifolium, with the highest abundance found in Halophila ovalis. Correlation results showed a strong to very strong relationship between the abundance of Echinoderms and certain seagrass types (r = 0.77–0.99) as well as a strong correlation at the overall level of the station (r = 0.74). This study confirms that the presence and abundance of Echinoderms is greatly influenced by the density and composition of seagrass species. These findings provide important baseline data for the management and conservation of seagrass beds as a support for the sustainability of coastal biodiversity.  

Penelitian ini bertujuan untuk mengetahui berat beton, kuat tekan dan nilai biaya pada beton campuran styrofoam sebagai pengganti agregat kasar untuk mendapatkan beton ringan dengan cara membuat benda uji berbentuk silinder Ø15-30 cm dengan perbandingan volume 1 Pc: 2 Pasir: 3 Styrofoam, 1 Pc : 1.5 Pasir: 2, 5 Styrofoam dan 1 Pc : 1,25 Pasir : 2,75 Styrofoam serta beton normal dengan komposisi 1 Pc : 2 Pasir dan 3 Agregat kasar sebagai pembanding. Berat volume yang diperoleh untuk komposisi 1 Pc: 2 Pasir: 3 Styrofoam adalah 1323,64 kg/m3,komposisi 1 Pc: 1,5 Pasir: 2,5 Styrofoam adalah 1274,61 kg/m3,dan komposisi 1 Pc : 1,25 Pasir : 2,75 Styrofoam adalah 1112,46 kg/m3, dan beton normal 1 Pc : 2 Pasir : 3 Kerikil adalah 2366,33 kg/m3. Selisih berat beton styrofoam terhadap beton normal kurang lebih 47,73%. Kuat tekan karakteristik komposisi 1 Pc: 1,5 Pasir: 2,5 Styrofoam 85,73 kg/cm2, 1 Pc: 1,25 Pasir: 2,75 Styrofoam 80,39 kg/cm2 sedangkan kuat tekan karakteristik untuk komposisi 1 Pc: 2 Pasir: 3 Styrofoam adalah 110,31 kg/cm2 (>100 kg/cm2) dan beton normal 1 Pc : 2 Pasir : 3 Kerikil adalah 155,29 kg/cm2. Berat volume beton  campuran styrofoam dan karakteristik kuat tekan menunjukkan bahwa styrofoam sebagai pengganti agregat kasar hanya ditujukan untuk pekerjaan konstruksi ringan. Biaya pembuatan beton komposisi 1 Pc: 2 Pasir: 3 Styrofoam adalah Rp. 1.751.365, 1 Pc: 1,5 Pasir: 2,5 Styrofoam sebesar Rp. 1.555.587, dan komposisi 1 Pc : 1,25 Pasir : 2,75 Styrofoam sebesar Rp. 1,604,697, sedangkan untuk beton normal 1 Pc : 2 Pasir : 3 Kerikil hanya sebesar Rp. 631,293. Selisih perbandingan biaya beton campuran styrofoam lebih mahal kisaran 63,95% dari harga beton normal.