Jurnal Sains Teknologi dan Lingkungan (JSTL)
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Implementasi Penentuan Lokasi Dalam Gedung Menggunakan LoRa RSSI Dan Jaringan Syaraf Tiruan Pada ESP32
Full text linkImplementasi Penentuan Lokasi di dalam Gedung semkain banyak digunakan terutama pada fasilitas umum seperti sekolah dan rumah sakit dimana sinyal GPS tidak mampu memberikan akurasi yang maksimal. Pada penelitian ini akan dilakukan implementasi penentuan lokasi didalam Gedung dengan menggunakan nilai dari sinyal Received Signal Strength Indicator (RSSI) pada perangkat LoRA. Data RSSI yang dikumpulkan akan digunakan untuk melatih jaringan syaraf tiruan dengan menggunakan struktur empat neurons sebagai input, sepuluh neurons hidden dan lima neurons untuk output berupa hasil klasifikasi ruangan yang diberikan. Proses training dilakukan dengan menggunakan Python beserta numpy dan Pandas sebagai library-nya. Hasil dari training tersebut adalah berupa sejumlah weights dan bias yang digunakan sebagai external library pada ESP32 microcontroller.
Berdasarkan hasil pengujian data training, didapatkan bahwa ANN memberikan performa yang lebih baik jika dibandingkan dengan SVM. Pada ANN didaptkan nilai akurasi, presisi dan recall 0.90, 0.8666 dan 0.9333 secara berturut-turut. Sedangkan pada SVM didapatkan nilai akurasi 0.92 , presisi 0,7133 dan recall 0.6932 . dari hasil tersebut dapat dilihat bahwa ANN lebih akurat dalam hal meng-klasifikasikan ruangan yang memiliki pola nilai RSSI yang hampir mirip, seperti ruangan koridor. Hal ini memberikan informasi bahwa ANN sangat cocok diiimplementasikan untuk penentuan lokasi didalam Gedung dan sesuai untuk digunakan pada perangkat ESP32. Penelitian berikutnya diharapkan dapat menggunakan algoritma optimasi untuk mendapatkan nilai weight dan bias yang lebih baik
Keanekaragaman, Kelimpahan dan Biomassa Biota Nektonik Indikator Terumbu Karang serta Jenis Ikan Lainnya di Kawasan Konservasi Pulau Gili Matra, NTB
Full text linkCoral reefs are coastal ecosystems with high biodiversity that play a crucial role in aquatic productivity and the sustainability of fisheries resources. Nektonic biota are closely linked to coral reef conditions through their roles in trophic structure, energy cycling, and the regulation of ecosystem dynamics. This study aimed to analyze the diversity, abundance, and biomass of reef-associated nektonic indicator species and other reef fishes in the Gili Matra Marine Conservation Area, West Nusa Tenggara, Indonesia. Data were collected from March to June 2024 using the Underwater Visual Census (UVC) method along 70 m belt transect
Viabilitas Biji Kakao (Theobroma cacao L.) Perkebunan Rakyat Lombok Utara pada Berbagai Tingkat Kematangan: Implikasi Ekonomi dan Keberlanjutan
Full text linkThis study aimed to evaluate the effect of cocoa pod maturity on seed viability and early seedling growth in smallholder plantations of North Lombok, and its implications for economic efficiency and sustainability. The experiment was conducted using a factorial randomized complete design with three cocoa genotypes (Genotype-1, Genotype-2, and MCC-02) and three pod maturity levels (140, 150, and 170 days after flowering/DAF). The results indicated that seeds from physiologically mature pods (140 DAF) had the highest viability (germination rate 89.2% and normal seedlings 82.2%), whereas overripe pods (170 DAF) showed a significant decline (65.8% and 46.6%). Seedling growth up to two months was not significantly affected by pod maturity. Harvesting at 140–150 DAF proved more economically efficient by reducing nursery costs, while also supporting sustainability through the availability of high-quality seedlings without land expansion. These findings highlight the importance of appropriate harvest timing to enhance productivity and sustain smallholder cocoa production systems
Analisis Perubahan Tutupan Lahan Di Ekosistem Mangrove Kecamatan Lembar Kabupaten Lombok Barat
Full text linkWest Lombok Regency. Using the Vector Geoprocessing method, the study processes and analyzes spatial GIS data, focusing on graphical data (geometry) and attributes (identity) through ArcMap Desktop. The main analysis techniques used include overlay analysis and buffer analysis, which are very important for spatial data analysis in GIS. This study uses mangrove distribution data from 1996-2021 which is analyzed to obtain the distribution of mangroves in the desired area. In Lembar District, there are four villages that have mangrove ecosystems, namely Eyat Mayang, Labuan Tereng, Lembar & South Lembar villages. In each village from year to year there is a change in area. The mangrove ecosystem in Lembar District from year to year has experienced an overall reduction starting from 1996-2021, experiencing a decrease of approximately 69%, namely from an area of 186 Ha to 59 Ha. However, there is one village that experienced an increase in mangrove ecosystems in 2016-2021, namely an increase of approximately 3 Ha. This cannot be separated from internal and external factors that occur so that they have an impact on changes in the mangrove ecosystem in an area. The factor that most influences changes in the area of mangroves is the existence of development in the area so that it has an impact on the mangrove ecosystem
Pemetaan Daerah Rawan Banjir dengan Pemanfaatan Sistem Informasi Geografis pada Tiga Daerah Aliran Sungai (DAS) di Kawasan Ekonomi Khusus Mandalika
Full text linkThe Mandalika Special Economic Zone (SEZ) is currently a leading destination not only in Lombok but also in Indonesia. The presence of the Mandalika Circuit as a MotoGP race venue, along with the beauty of the coastal landscape and other tourism potential, makes Mandalika a Super Priority Destination. The Mandalika SEZ is located in three river basins, namely Tebelo Ngolang and Balak. Behind the splendor of the Mandalika Circuit and other supporting infrastructure lies a series of flood data that hit the area, including the floods of January 30, 2021, and December 23, 2022. Based on these events, a study is needed to map the flood risk in the three watersheds and the Mandalika SEZ. This flood risk map can later serve as a basis for formulating policies and anticipatory measures for future flooding. The required data includes rainfall data, land use maps, topographic maps, land use maps, slope maps, and geological/soil type data. The data were then analyzed using a Geographic Information System (GIS) and then overlaid using the ArcGIS software program. Based on the overlay results and weighting of the supporting factors for flooding, flood vulnerability at the study location can be determined. The results showed that the Tebelo Watershed is divided into 3 categories, namely a moderately vulnerable area of 270.32 ha, a vulnerable area of 479.89 ha and a very vulnerable area in the downstream area of 85.44 ha. The Ngolang Watershed is divided into two categories dominated by a vulnerable area of 930.97 ha and a moderately vulnerable area of 568.68 ha. Meanwhile, the Balak Watershed is divided into two categories, namely a vulnerable area of 1,418.59 ha and a moderately vulnerable area of 1,243.53 h
Analisis Pola Spatio-Temporal Gempa Bumi di Zona Busur Belakang Utara Lombok–Flores Menggunakan Agglomerative Clustering
Full text linkThis study aims to identify earthquake clustering patterns in the Northern Lombok–Flores Back-Arc Zone using the Agglomerative Clustering method. Seismic data were obtained from the United States Geological Survey (USGS) covering the period 1970–2021, using latitude, longitude, depth, and magnitude as clustering variables. A sliding window approach was applied to capture the temporal evolution of seismic activity. The results indicate the formation of three stable clusters that consistently represent different earthquake depth levels across all analyzed time windows. Although fluctuations in the occurrence of large-magnitude earthquakes were observed in several windows, these variations did not significantly affect the clustering structure. This study demonstrates that the combination of Agglomerative Clustering and a sliding window approach is effective for identifying depth-based earthquake clustering patterns and describing their temporal dynamic
Perbaikan Pertumbuhan dan Pengendalian Penyakit Busuk Pangkal Batang Bawang Putih dengan Aplikasi Pupuk Kohe Kambing yang Difermentasi dengan Bioaktivator Streptomyces sp
Full text linkThis research is an experimental study conducted on rice fields owned by farmers in Sembalun village and the Microbiology Laboratory of the Faculty of Agriculture at Unram. The research aims to determine the effect of fertilizer fermented with Streptomyces sp. on the growth and yield of garlic plants as well as the control of basal rot disease in garlic plants. The research was arranged using a Completely Randomized Design (CRD) consisting of 6 treatments and repeated 6 times, resulting in 36 experimental units. The six treatments are: Without fertilizer application (P0), Goat manure fertilizer without the addition of bioactivator (P1), Goat manure fertilizer + Streptomyces sp. isolate SH (P2), Goat manure fertilizer + Streptomyces sp. isolate BSi (P3), Goat manure fertilizer + Streptomyces sp. isolate BSc (P4). Goat manure fertilizer + Isolate SH + Liquid SH (P5). The research results show that the treatment with Streptomyces sp isolate BSi (P3) produced the tallest plants (57.741 cm) and was significantly different from the treatment without fertilizer. (P0). Treatment P3 also produced the highest number of leaves (10.05) significantly different from the other treatments. The highest wet and dry weight of garlic bulbs was obtained in treatment P5, which were 2.556 g and 2.343 g, respectively. The lowest intensity of Fusarium wilt disease was obtained in treatment P4, which was 6.33%, and it was significantly different from P0 or without fertilizer treatment
Periode Kritis Jagung (Zea mays L.) Berkompetisi dengan Gulma di Lahan Kering
Full text linkResearch into the critical phase of weed competition in maize aims to determine weed control at the right time. The study used a randomized block design consisting of eight treatments with weed-free (WWF) and weed-free (WF) plant age periods up to 10, 20, 30, 40, 50, 60, 70, and 80 days after planting (DAP). Each treatment was randomly repeated in three blocks, resulting in 54 experimental units The observation parameters include weed population, dry biomass weight of weeds and maize, plant height, leaf area, ear length, ear diameter and dry weight of maize kernels per plot. Data analysis using analysis of variance and William's statistical test. The results of the study showed that the critical period for corn competition with weeds on dryland was about 20 - 30 DAP when the corn was planted. If weeds are removed after the plants are more than 30 days old, the harvest cannot be saved. Plants competing with weeds for 40, 50, 60, 70, and 80 days experienced yield reductions of 60.32%, 82.84%, 98.66%, 99.99%, and 99.99%, respectively. In contrast, plants that were only weed-free up to the age of 10, 20, and 30 days showed yield losses of 98.66%, 80.16%, and 61.40%, respectively. It is recommended to start controlling corn weeds on dry land 20 days after planting and to avoid weeding 30 days after planting
Studi Karakteristik Pohon Bertengger Celepuk Rinjani (Otus jolandae) di Desa Wisata Jeruk Manis, Lombok Timur, Nusa Tenggara Barat
Full text linkThe study entitled Characteristics of Food Tree Habitat and Langur Population in Jeruk Manis Tourism, Kembang Kuning Resort, TNGR aims to understand the role of habitat in the survival of the Javan langur (Trachypithecus auratus), an endangered primate species. The Javan langur functions as a natural seed disperser in the forest, and its presence is very important for the plant regeneration process. This study was conducted in November-December 2024 in Kembang Kuning Village, East Lombok, using the population census method and vegetation analysis. The research method includes collecting data on the langur population through the concentration method and vegetation analysis by creating sample plots measuring 20 x 20 m. The results showed that the langur population varied in various plots, with a higher proportion of adult individuals in some locations, indicating group stability. The data also showed that the bajur tree (Pterocarpus indicus) was the main food source with a high Importance Value Index (INP) value. This study provides insight into the composition and structure of vegetation in the langur habitat, as well as the importance of conserving this species in the face of threats from hunting and habitat loss. By understanding the characteristics of the habitat and distribution patterns of the langur populatio
Analisis Strategi Pemasaran Gurita Di Kecamatan Sekotong Kabupaten Lombok Barat
Full text linkOctopus is one of the fisheries products that has high economic value and stable demand, especially from the export market. This study aims to analyze the marketing strategy of octopus in Sekotong District, West Lombok Regency, using a descriptive approach through SWOT analysis and EFAS and IFAS matrices. Data were collected through observation, interviews, and distributing questionnaires to 30 respondents consisting of fishermen and collectors. The results of the study indicate that the marketing strategy of octopus still faces a number of challenges, such as the weak bargaining position of fishermen, limited post-harvest handling facilities, minimal access to promotion, and high dependence on middlemen. The SO (Strength-Opportunity) strategy is the most recommended strategy, especially by encouraging digital promotion and the formation of fishermen's institutions to expand market access