ABSTRAKPenelitian ini bertujuan untuk: (1) mendeskripsikan karakteristik, (2) validitas, dan (3) keterbacaan Lembar Kerja Siswa (LKS) dengan model dscovery learning pada pokok bahasan titrasi asam basa. Jenis penelitian ini adalah penelitian pengembangan dengan tahapan penelitian yang diadaptasi oleh Sugiyono. Tahap penelitian yang dilakukan adalah pengumpulan data, desain produk, validasi desain, revisi desain, uji coba lapangan terbatas, dan revisi produk. LKS yang dikembangkan terdiri dari dua subtopik bahasan yaitu titrasi asam basa dan kurva titrasi. Karakteristik LKS dengan model discovery learning pada pokok bahasan titrasi asam basa, yaitu (1) menggunakan sintak discovery learning dan (2) menyajikan fenomena/gambar yang spesifik. Validasi LKS melibatkan satu orang ahli isi, satu orang ahli desain dan media pembelajaran, satu orang ahli bahasa, dan satu orang praktisi. Uji coba terbatas melibatkan 9 siswa kelas XI SMAN 2 Negara. Hasil validasi menunjukkan bahwa LKS yang dikembangkan telah memenuhi kategori valid. Berdasarkan hasil uji keterbacaan oleh siswa diperoleh tingkat keterbacaan yang baik. Kata kunci: discovery learning, lembar kerja siswa, titrasi asam basa. ABSTRACT This study aimed to (1) describe the characteristics, (2) the validity, and (3) the readability of Student Worksheets (LKS) with discovery learning models in the acid base titration topic. This type of research is research and development with the research stages adapted by Sugiyono. The stages of the research conducted are data collection, product design, design validation, design revision, limited field trials, and product revisions. The developed worksheet consisted of two subtopics, namely acid base titration and titration curve. Characteristics of LKS with discovery learning models in the acid base titration topic, namely (1) using discovery learning syntax and (2) presenting a specific phenomenon/image. LKS validation involves one content expert, one design and learning media expert, one linguist, and one practitioner. Limited trials involving 9 students of class XI of SMAN 2 Negara. The validation results show that the developed LKS has meets the valid category. Based on the results of the readability test by students obtained a good level. Keywords: acid base titration, discovery learning student worksheets.

The literature reviewed paper was aimed to explain the role of paddy’s plantation for reserving silica powder, to explain the current developing of advanced materials from the high siliconeous rice plant biomasses, to propose a scheme of value addition of paddy’s biomasses for sustainable rice agriculture development. A comprehensive literature review through meta analysis on articles published in last few decades was conducted. Because of high silicon content of rice biomasses especially rice straws and husks and their abundance in availability, the rich silicon biomasses can be used as raw material for producing a high purity reactive fine powder silica, and unexpesive and environment-friendly production processes. Current development results on advanced materials from the rich siliconeous biomasses were reported, namely silicon carbides, amorphous reactive silica, nanosilica, and silica-carbon nanocomposite. The implementation of silicon chemistry takes important role for enhancing the added value of rice husks and straws as the side products of paddy’s agriculture to produce some advanced materials inexpensively and environment-friendly. The added values can be considered to overcome the problems of lack paddy’s farmer income and the land conversion tendency of rice field, thus the paddy’s agriculture can be developed sustainably.

Inorganic–organic hybrid biomaterials have recently attracted much attention because of their widespread use. Silkworm cocoon filaments resulting from sericulture as prospective nanobiomaterials need to be improved, and their properties need to be used for broader purposes. This study was aimed at investigating methods for siliconization of silkworm cocoon filaments and characterizing their cocoon filament properties in terms of their yarn quality, natural dyeing, and antibacterial properties. Three methods of hybridization processes were used in this experiment, namely, in situ natural dyeing of silk yarns while silk filaments were spined, feed engineering through spraying the mulberry leaves with natural dyes and silica–phosphate–M (M = Cu, Fe, or Al) nano pastes, and a combination of both methods. The resulting cocoon filaments were characterized by their siliconization of filament fibers by using FTIR, XRD, and SEM-EDS methods. The yarn tensile strength, color quality, color fastness properties affected by the siliconization of silk filament fibers, and antibacterial properties were also investigated. Results showed that the combination method produced better siliconization of silk fibers, and, consequently, the better siliconization of silk fibers produced better natural dyeing as well as antibacterial properties of their resulting silk yarns.

The village of Jagaraga, located in the Sawan district of Buleleng Regency, Bali Province, had significant potential in both culture and agriculture, particularly in rice farming. More than half of the village’s land area was rice fields, and over two-thirds of the villagers were rice farmers. However, ensuring healthy soils and crops through effective fertilizer solutions remained a major challenge. The aim of the community development initiative was to empower the village farmers to become innovative through collaborative learning and by inventing and commercializing a slow-release nano fertilizer. A participatory action and learning approach was used to engage the rice farming community. The Subak Babakan farmer organization and the local rice milling enterprise, PB Suwela Amertha, were involved in the empowerment activities, which included information sessions, training, technology application, guidance, evaluation, and sustainability planning. As a result, four formulas of slow-release organic nano fertilizers in pellet form were successfully developed. Additionally, a four-helix partnership involving academicians, the farmer community, enterprises, and the government was established to build a business platform for commercializing the innovation. Through this collaboration, academicians and community farmers successfully learned to address the primary challenges in rice agriculture innovatively while promoting sustainable practices to maintain the health of the land and the well-being of the villagers.

Our finding on a technology for producing woodcrafts using nanocomposite reinforced synthetic wood becomes an alternative solution for solving the current problems of Balinese woodcraft industries. The study on applying the current developed synthethic wood technology was conducted in order to analyze the production cost comparing toward the cost using natural wood, to gain the market responses for analyzing the comsumer satisfaction and the market competitive prices and to gain the stakeholders for innitiating a cluster industry. The costumer satisfaction as well as stakeholder acceptibility on the synthetic wood technology could revitalize the Balinese woodcraft industries.

Nanopartikel adalah teknologi manipulasi materi pada skala atomik dan skala molekuler untuk mendapatkan sifat-sifat yang dapat dikontrol sesuai keinginan. Perkembangan metode-metode sintesis saat ini cukup beranekaragam dan hanya beberapa saja yang berhasil mendapatkan hasil optimal. Tujuan dari penelitian ini adalah mengembangkan metode sintesis yang dapat menghasilkan nanopartikel tembaga oksida yang optimal dengan mengkondisikan pengaruh-pengaruh yang berperan dalam proses sintesis nanopartikel. Penelitian true experiment ini dilakukan di laboratorium dengan tahapan pembuatan ekstrak kunyit, pembuatan larutan prekursor dari tembaga asetat, pencampuran larutan ekstrak kunyit dan tembaga asetat, mengontrol konsentrasi, pH dan suhu pemanasan, pengadukan larutan campuran, pemisahan larutan dengan endapan, pengeringan endapan, menghitung hasil rendemen, selanjutnya dilakukan pengujian XRD, SEM-EDX, dan PSA untuk mengetahui karakteristik sampel yang telah dibuat. Pada penelitian ini membuktikan bahwa (a) nanopartikel berhasil dibuat dengan ciri-ciri dan sifat yang sesuai, (b) konsentrasi, suhu pemanasan, dan asam basa mempengaruhi hasil rendemen, morfologi, ukuran, kemurnian, dan derajat kekristalan. Dapat disimpulkan bahwa ada pengaruh konsentrasi, suhu, dan pH pada green synthesis nanopartikel tembaga oksida dan kondisi optimum yang didapat berdasarkan XRD, SEM-EDX, dan PSA ada pada uji coba dua atau konsentrasi 0,1 M, suhu 60oC, dan pH 7. Kata kunci : nanopartikel, metode sintesis, tembaga oksida