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All Journal Jurnal Biologi Tropis ELECTRA : Electrical Engineering Articles Agroteksos NEAR: Jurnal Pengabdian kepada Masyarakat DEVOTE: Jurnal Pengabdian Masyarakat Global Jurnal Malikussaleh Mengabdi
Shabrina, Hasyyati
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Analisis Efek Aliasing Pada Sinyal Audio Dengan Variasi Frekuensi Sampling Pada Lagu ‘Terhebat’ Shabrina, Hasyyati; Setyowati, Endah; Ahmayani, Inda; Putri, Khalifah Audya Eka
ELECTRA : Electrical Engineering Articles Vol 5, No 1 (2024)
Publisher : UNIVERSITAS PGRI MADIUN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/electra.v5i1.20114

Abstract

Aliasing merupakan fenomena yang terjadi dalam pengolahan sinyal digital, termasuk sinyal audio, ketika frekuensi sampling yang digunakan tidak mencukupi untuk merepresentasikan frekuensi tertinggi dalam sinyal tersebut. Penelitian ini bertujuan untuk menganalisis efek aliasing pada sinyal audio dengan melakukan variasi frekuensi sampling pada lagu "Terhebat". Eksperimen dilakukan dengan menggunakan software MATLAB untuk memvisualisasikan dan menganalisis sinyal audio pada frekuensi sampling 11025 Hz, 22050 Hz, 44100 Hz, 88200 Hz, dan 32000 Hz. Hasil penelitian menunjukkan bahwa frekuensi sampling yang terlalu rendah, seperti 11025 Hz dan 22050 Hz, menyebabkan aliasing yang signifikan, ditandai dengan distorsi dan hilangnya detail frekuensi tinggi pada sinyal audio. Sebaliknya, frekuensi sampling yang terlalu tinggi, seperti 88200 Hz, tidak memberikan manfaat yang signifikan dalam meningkatkan kualitas audio. Frekuensi sampling 44100 Hz, yang umum digunakan dalam CD audio, menghasilkan kualitas audio yang baik dengan efek aliasing yang minimal. Penelitian ini menyimpulkan bahwa pemilihan frekuensi sampling yang tepat sangat penting untuk menghindari efek aliasing dan mempertahankan kualitas sinyal audio yang baik.
SIFAT FISIS DAN SIFAT MEKANIS KAYU KENANGA (Cananga ordorata) DAN SENGON (Paraserienthes falcataria) TERMODIFIKASI PANAS Lestari, Dini; Ningsih, Rima Vera; Shabrina, Hasyyati; Fahrussiam, Fauzan
AGROTEKSOS, Jurnal Ilmiah Ilmu Pertanian Vol 33 No 3 (2023): Jurnal Agroteksos Desember 2023
Publisher : Fakultas Pertanian Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/agroteksos.v33i3.996

Abstract

Kenanga and sengon wood are known for their inferior properties, necessitating effort to enhance their quality. In Wood Industry, thermal modification was used to enhance wood properties especially dimensional stability. The objective of this research was to evaluated the effect of wood species and thermal modification on physical and mechanical properties of wood. The wood modified by steam treatment at temperature of 1260C at pressure of 0.14 MPa for 1 hour. The physical properties tested included density, moisture content, volumetric swelling, and anti-swelling efficiency. The mechanical properties tested were the modulus of elasticity and modulus of rupture. The mechanical properties of the wood were tested according to ASTM D 143-05 (1996), and all parameters were compared between the thermal-modified wood and the control. The results showed that the density and moisture content parameters were only influenced by wood species while thermal modification and interaction of wood species and thermal modification did not affect density and moisture parameters. Furthermore, heat modification significantly improved the dimensional stability of the wood, as evidenced by a decrease in volumetric swelling and anti-swelling efficiency value higher than 40%. Additionally, heat modification slightly enhanced the mechanical properties of kenanga and sengon wood as seen from the increased values of modulus of elasticity and modulus of rupture values.
VARIASI DIMENSI BENIH AREN (ARENGA PINNATA MERR) DARI TIGA SENTRA PRODUKSI AREN DI PULAU LOMBOK Chaerani, Nurul; Shabrina, Hasyyati; Prasetyo, Andrie Ridzki; Aji, Irwan Mahakam Lesmono; Hidayati, Eni
AGROTEKSOS, Jurnal Ilmiah Ilmu Pertanian Vol 33 No 3 (2023): Jurnal Agroteksos Desember 2023
Publisher : Fakultas Pertanian Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/agroteksos.v33i3.970

Abstract

Aren merupakan tanaman perkebunan multi-guna yang memiliki penyebaran yang luas di Indonesia, termasuk di Pulau Lombok. Aren layak dijadikan sumber usaha untuk meningkatkan pendapatan Masyarakat. Keberlanjutan usaha aren harus didukung dengan tersedianya tegakan yang masih produktif, namun faktanya dilapangan banyak tegakan yang sudah tua dan tidak dilakukan permudaan. Kegiatan permudaan dapat didukung dengan mempersiapkan bibit yang berkualitas. Upaya eksplorasi sumber benih merupakan langkah awal untuk mendukung kegiatan permudaan. Benih yang berasal dari sumber berbeda umumnya memiliki warna, berat, dan ukuran yang bervariasi yang berkolerasi dengan kemampuan adaptasi benih pada lingkungan baru. Tujuan penelitian ini adalah untuk menganalisis variasi dimensi benih aren dari tiga lokasi sentra produksi aren di pulau Lombok serta menganalisis korelasi antar dimensi benih. Sumber benih berasal dari 3 lokasi di Pulau Lombok yaitu Jurit Baru (Lombok Timur), Aik Bual (Lombok Tengah), dan Bentek (Lombok Utara). Benih aren dari ke-3 lokasi diambil sebanyak 30 benih, sehingga total seluruhnya yaitu 90 benih. Benih diukur dimensinya yaitu panjang, lebar, tebal, dan berat. Hasil analisis menunjukkan sumber benih yang memiliki dimensi benih terbaik yaitu Aik Bual dan Jurit Baru. Terdapat korelasi positif antar dimensi benih. Benih dari Aik Bual dan Jurit Baru termasuk dalam ketegori benih ukuran besar dan sedang
LANDSAT 9 IMAGERY BASED MANGROVE FOREST MAPPING USING MAXIMUM LIKELIHOOD CLASSIFIER AND SUPPORT VECTOR MACHINE ALGORITHM Prasetyo, Andrie Ridzki; Valentino, Niechi; Shabrina, Hasyyati
AGROTEKSOS, Jurnal Ilmiah Ilmu Pertanian Vol 33 No 3 (2023): Jurnal Agroteksos Desember 2023
Publisher : Fakultas Pertanian Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/agroteksos.v33i3.975

Abstract

The successful launch of Landsat 9 in 2021 emphasizes the commitment to the continuity of the Landsat mission to provide global medium resolution satellite records. The benefit of the availability of the Landsat dataset is the extraction of information related to mangrove forest cover through mapping, especially in Gili Lawang. The main challenge in mangrove mapping is selecting a classification method that provides the most accurate results. This article aims to explore the use of the Maximum Likelihood Classifier (MLC) and Support Vector Machine (SVM) algorithms in the context of mangrove mapping using Landsat 9 imagery on Gili Lawang. The two algorithms show differences in detecting the area of mangrove, non-mangrove and water bodies, respectively for SVM 371.89 ha, 58.11 ha, 3.73 ha; while the MLC algorithm is 328.88 ha, 98.41 ha, and 6.45 ha. The MLC algorithm identifies non-mangrove objects at the outer boundary of Gili Lawang, while SVM identifies the same area as mangrove objects due to the influence of the training area created and low separability. The SVM algorithm has better accuracy with a Kappa statistic of 0.85 compared to MLC with a value of 0.73. Keywords: Gili Lawang, Landsat 9, Mangrove, Support Vector Machine, Maximum Likelihood Classifier
Introduction of Eco-Friendly Finishing Method (YAKISUGI) among the Millennial Generation in Perina Village: Innovation in Unique Furniture Products with High Aesthetic Value Fahrussiam, Fauzan; Chaerani, Nurul; Lestari, Dini; Musdi, Musdi; Shabrina, Hasyyati; prasetyo, Andrie ridzki
Jurnal Malikussaleh Mengabdi Vol 2, No 2 (2023): Jurnal Malikussaleh Mengabdi, Oktober 2023
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jmm.v2i2.13605

Abstract

The demand for a diverse range of solid wood products has been steadily increasing. The unique grain patterns inherent to each wood species render solid wood products to possess distinct market segments. Nevertheless, the inherent vulnerabilities of wood as a biomaterial, such as susceptibility to decay, dimensional instability, and low resistance to organisms, necessitate specialized treatment for wood products. One environmentally sustainable treatment methodology, capable of enhancing the aesthetic value of wood, is the yakisugi finishing technique—a method involving the controlled charring of the wood surface. Notably, this technique remains relatively unfamiliar amongst small and medium-sized wood processing enterprises (UMKM) and the millennial generation. Consequently, this engagement initiative assumes significant importance in introducing the yakisugi finishing method to the millennial cohort. The unique visual characteristics of wood, engendered by this technique, hold the potential to serve as a catalyst for innovation in the realm of wooden product development by millennials. The engagement activities primarily encompass instructional modules, comprising theoretical elucidations and practical applications. Participants, affiliated with the youth group 'karang taruna,' have demonstrated appreciable enthusiasm towards the engagement activities that pertain to the yakisugi technique. It is anticipated that novel products will emerge as a result of the application of the yakisugi finishing technique, particularly within the domain of contemporary minimalist furniture products.
PELAKSANAAN PROGRAM ASISTENSI MENGAJAR ANGKATAN I DI SMK KEHUTANAN WANA WISATA SEKAROH LOMBOK TIMUR Halimah, Baiq Elok Salsabila; Firmansyah, Harits; Hidayati, Maulia; Irham, Muhammad; Istiani, Ratna Ayu; Lestari, Dini; Prasetyo, Andrie Ridzki; Shabrina, Hasyyati; Fahrussiam, Fauzan; Chaerani, Nurul; Musdi, Musdi
Devote : Jurnal Pengabdian Masyarakat Global Vol. 3 No. 2 (2024): Devote : Jurnal Pengabdian Masyarakat Global, Juni 2024
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/devote.v3i2.2968

Abstract

Education is the process to form an individual’s character into someone possesses useful knowledge in daily life. Teaching assistance Program was one of government’s efforts to improve the quality of learning activities in Indonesi. This article aims to provide an explanation of the implementation of Teaching Assistance Program for the first-year student of Forestry Program at Matarma Universita, which conducted at the Forestry Vocational School, Wana Wisata Sekaroh, Jerowaru Subdistrict, East Lombok. This activity took place approximately 4 months. The method of implementing the program cosnsisted of orientation, deployment, observation, planning program, report, program execution,and evaluation. The activities carried out included teaching program, assisting with school administrarion, creating a school garden, assisting with technology adaptatiom, conducting outreach to student about the graduate from Yunior high school and the nearest junior high school, creating banners and poster, establishing a Numeracy Literacy Garden, Planting tree sapling within the School, and making charcoal briquettes from corn husk, The series of activitie were carried out successfully.
Analisis Efek Aliasing Pada Sinyal Audio Dengan Variasi Frekuensi Sampling Pada Lagu ‘Terhebat’ Shabrina, Hasyyati; Setyowati, Endah; Ahmayani, Inda; Putri, Khalifah Audya Eka
ELECTRA : Electrical Engineering Articles Vol. 5 No. 1 (2024)
Publisher : UNIVERSITAS PGRI MADIUN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25273/electra.v5i1.21265

Abstract

Aliasing merupakan fenomena yang terjadi dalam pengolahan sinyal digital, termasuk sinyal audio, ketika frekuensi sampling yang digunakan tidak mencukupi untuk merepresentasikan frekuensi tertinggi dalam sinyal tersebut. Penelitian ini bertujuan untuk menganalisis efek aliasing pada sinyal audio dengan melakukan variasi frekuensi sampling pada lagu "Terhebat". Eksperimen dilakukan dengan menggunakan software MATLAB untuk memvisualisasikan dan menganalisis sinyal audio pada frekuensi sampling 11025 Hz, 22050 Hz, 44100 Hz, 88200 Hz, dan 32000 Hz. Hasil penelitian menunjukkan bahwa frekuensi sampling yang terlalu rendah, seperti 11025 Hz dan 22050 Hz, menyebabkan aliasing yang signifikan, ditandai dengan distorsi dan hilangnya detail frekuensi tinggi pada sinyal audio. Sebaliknya, frekuensi sampling yang terlalu tinggi, seperti 88200 Hz, tidak memberikan manfaat yang signifikan dalam meningkatkan kualitas audio. Frekuensi sampling 44100 Hz, yang umum digunakan dalam CD audio, menghasilkan kualitas audio yang baik dengan efek aliasing yang minimal. Penelitian ini menyimpulkan bahwa pemilihan frekuensi sampling yang tepat sangat penting untuk menghindari efek aliasing dan mempertahankan kualitas sinyal audio yang baik.
Peningkatan Keterampilan Anggota PKK Desa Perina melalui Pelatihan Pembuatan Cairan Eco-Enzyme dan Sabun Cuci Berbasis Eco-Enzyme Chaerani, Nurul; Shabrina, Hasyyati; Lestari, Dini; Ningsih, Rima Vera; Fahrussiam, Fauzan
NEAR: Jurnal Pengabdian kepada Masyarakat Vol. 4 No. 2 (2025): NEAR
Publisher : Komunitas Dosen Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32877/nr.v4i2.2316

Abstract

Volume sampah yang tinggi menjadi masalah yang belum terselesaikan oleh masyarakat di Desa Perina Kabupaten Lombok Tengah. Kabupaten Lombok Tengah merupakan daerah penghasil sampah terbanyak ke-2 di NTB, dengan 97% tidak dikelola dan 12% masuk ke TPA. Mayoritas sampah yang ada merupakan sampah rumah tangga, dengan proporsi terbanyak yaitu sampah organik yang menimbulkan masalah lingkungan seperti bau tidak sedap dan penyakit. Sampah organik dapat diolah menjadi eco-enzyme sebagai bahan campuran sabun untuk mengurangi penggunaan surfaktan sintetis. Hingga saat ini, belum banyak sabun cair yang menggunakan kombinasi eco-enzyme dan metil ester sulfonat (MES), terutama di Lombok. Tujuan kegiatan ini yaitu meningkatkan keterampilan anggota PKK Desa Perina dalam mengolah sampah organik menjadi eco-enzyme untuk menurunkan volume sampah rumah tangga, serta memberikan pelatihan pembuatan sabun cair berbahan eco-enzyme yang bernilai ekonomi dan ramah lingkungan. Kegiatan pengabdian dilaksanakan tanggal 01 September 2024 di Desa Perina Lombok Tengah yang dihadiri oleh 15 orang anggota PKK. Pelatihan diawali dengan pembukaan, penyampaian materi terkait pengelolaan sampah menjadi produk bernilai ekonomi, pelatihan pembuatan eco-enzyme dan sabun cair berbasis eco-enzyme, evaluasi terhadap kegiatan pengabdian, dan penutupan. Hasil evaluasi menunjukkan bahwa tingkat kepuasan peserta pada semua aspek penilaian berada dalam kategori baik hingga sangat baik dengan persentase lebih dari 50%.
Spatial Distribution Pattern of Plants with Potential to Regulate Water Balance in the Babak Watershed Upstream Area Prasetyo, Andrie Ridzki; Valentino, Niechi; Setiawan, Budhy; Shabrina, Hasyyati; Chaerani, Nurul; Syahruanda, Eggi
Jurnal Biologi Tropis Vol. 25 No. 2 (2025): April-Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v25i2.9010

Abstract

Watershed degradation poses a serious threat to water availability, ecosystem sustainability, and human well-being. This study aims to identify and analyze the spatial distribution patterns of three key water-regulating plant species Pterospermum javanicum, Ficus spp., and Dendrocnidae decumana in the upstream area of the Babak Watershed, Lombok, Indonesia. Field data were collected through exploratory surveys and analyzed using the Average Nearest Neighbor (ANN) method in ArcGIS 10.8. The results reveal distinct spatial patterns: D. decumana exhibits a random distribution (R = 0.925), while Ficus spp. (R = 0.667) and P. javanicum (R = 0.698) show clustered patterns. These patterns reflect ecological adaptations such as tolerance to environmental heterogeneity or vegetative reproduction strategies. Despite differences, all three species significantly contribute to watershed hydrology by enhancing infiltration, reducing surface runoff, and stabilizing soil. Spatial analysis of vegetation distribution provides essential insights for data-driven watershed management and supports targeted conservation strategies in ecologically sensitive upstream zones.
EST-SSR Mining and Characterization from Aquilaria malaccensis Transcriptome Shotgun Assembly Shabrina, Hasyyati; Chaerani, Nurul; Lestari, Dini; Prasetyo, Andrie Ridzki; Fahrussiam, Fauzan
Jurnal Biologi Tropis Vol. 24 No. 2 (2024): April - Juni
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v24i2.7060

Abstract

Aquilaria malaccensis is a member of Thymelaceae family which is one of the main trees producing agarwood compounds in Indonesia and has high economic value. A. malaccensis has Appendix II conservation status due to high exploitation in the nature.  One of the several efforts to maintain agarwood production while also maintaining agarwood population is efficient induction by manipulation of the pathway for agarwood formation and using individuals with higher production of agarwood compounds. Selection of superior individuals can be done using molecular markers that are linked to certain genes, including microsatellites or simple sequence repeats (SSR). This study aimed to identify SSRs in the agarwood transcriptome and characterized SSR sites that are linked to genes involved in the synthesis of agarwood compounds. The transcriptome data used was extracted from the NCBI database with accession number GHJS00000000.1. SSR mining was carried out using Krait v.1.4.0 software, then BLASTed with the protein database to analyze the linkage with the related genes. Perfect SSRs were found in 0.37% of the total sequences, and compound SSRs were 10.89%. The abundance of imperfect SSR (107,043) was greater than perfect SSR (31,262), indicating that SSR in the transcriptome had a low mutation rate and the SSR site was more conserved in A. malaccensis. The SSRs that linked to genes related to agarwood synthesis including HMGR, PAL, Mevalonate Kinase, MAPK, Delta-guaiene synthase, Farnesyl pyrophosphate synthase, and Phenylalanine ammonia-lyase. The discovery of SSRs linked to these genes can be used to create molecular markers that can be applied in agarwood producing trees selection.
Co-Authors Ahmayani, Inda Chaerani, Nurul Dini Lestari, Dini Endah Setyowati Eni Hidayati Fauzan Fahrussiam Firmansyah, Harits Halimah, Baiq Elok Salsabila Hidayati, Maulia Irwan Mahakam Lesmono Aji Istiani, Ratna Ayu Muhammad Irham musdi, musdi Niechi Valentino Prasetyo, Andrie Ridzki Putri, Khalifah Audya Eka Rima Vera Ningsih Setiawan, Budhy Syahruanda, Eggi