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All Journal Jurnal Teori dan Aplikasi Fisika Indonesian Community Service and Empowerment Journal (IComSE)
Subhan Zul Ardi
Universitas Ahmad Dahlan
Arts Astronomy Computer Science & IT Electrical & Electronics Engineering Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Physics Social Sciences

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Sebuah Sistem Pencitraan Optik berbasis pada Proyeksi Pola Titik-titik Acak dengan Metode Digital Image Correlation (DIC) untuk Menentukan Profil Kekasaran Permukaan suatu Bahan Karisna; Margi Sasono; Subhan Zul Ardi
Jurnal Teori dan Aplikasi Fisika Vol. 12 No. 02 (2024): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v12i02.408

Abstract

Reliable methods (techniques) are needed to determine surface roughness accurately. Contact techniques are prevalent but can damage materials and are subject to much noise. Meanwhile, non-contact techniques (usually optical) still face setup complexity and inaccuracy. This paper designs a simple optical imaging system based on the projection of random dot patterns to determine the surface roughness of a material. It is technically simple as it only requires a Liquids Crystal Display (LCD) projector device to highlight the random dot pattern onto the surface of the test material and then a digital camera to capture it. The camera captures a reference image (just the random dots pattern) and a distortion image when the random dots pattern highlights the test material. Both images are digitally processed using the Digital Image Correlation (DIC) algorithm to obtain a correlation value proportional to the change in the pattern of random dots due to the presence of the test material surface. This change manifests as a pixel displacement field image estimated to be proportional to the surface roughness profile of the material. Based on this profile, a surface roughness index can be estimated. The validation test results show that the design can determine the roughness index ( of a randomly sprinkled plane surface with different diameters of cork balls (selected). The graph result shows that index  tends to increase linearly with the increase of cork ball diameter with a correlation value of = 0,97. The larger the diameter of the cork ball, the larger the surface roughness index. This result is rational and valid. The design is also verified to determine the roughness index of the surface of commercial sandpaper with various grit sizes. The larger the grit of the sandpaper, the smoother the sandpaper. The verification results show that the design can demonstrate that the larger the grit, the smaller the roughness index of the sandpaper. Thus, the developed optical imaging design is valid and has the potential to be simple, cheap, easy to operate, and fast in obtaining information about the surface roughness of a material.   Keywords: imaging, optical, projection, random-dots, surface-roughness.
PENGUATAN PERTANIAN BERKELANJUTAN BERBASIS ANALISIS TANAH, POLIKULTUR, DAN PEMANFAATAN Trichoderma PADA KELOMPOK TANI MUDA SERUT, GUNUNGKIDUL Oktira Roka Aji; Yudi Ari Adi; Umi Salamah; Subhan Zul Ardi; Arif Rahman
Indonesian Community Service and Empowerment Journal (IComSE) Vol. 7 No. 2 (2026): Indonesian Community Service and Empowerment Journal (IComSE)
Publisher : Divisi Pengabdian dan Pemberdayaan Masyarakat (DP2M) UNIKOM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34010/icomse.v7i2.20863

Abstract

Pertanian berkelanjutan penting diterapkan untuk menjaga produktivitas lahan, meningkatkan efisiensi penggunaan sumber daya, dan mengurangi dampak lingkungan akibat praktik pertanian dalam jangka panjang. Kegiatan pengabdian kepada masyarakat ini bertujuan meningkatkan pengetahuan Kelompok Tani Muda Serut, Kalurahan Serut, Kabupaten Gunungkidul, mengenai pertanian berkelanjutan serta menyusun arahan awal pemanfaatan lahan berdasarkan karakteristik tanah dan preferensi komoditas. Kegiatan dilaksanakan pada April 2026 dengan melibatkan 12 peserta melalui identifikasi kebutuhan, pretest, penyuluhan dan diskusi, pemetaan minat komoditas, analisis satu sampel tanah, serta posttest dan evaluasi. Data dianalisis secara deskriptif menggunakan persentase. Hasil menunjukkan bahwa rata-rata pengetahuan peserta meningkat dari 16,7% pada pretest menjadi 100% pada posttest, atau mengalami peningkatan sebesar 83,3 poin persentase. Seluruh indikator evaluasi materi juga memperoleh respons setuju atau sangat setuju dari 100% peserta. Analisis tanah menunjukkan tekstur yang relatif berimbang, terdiri atas pasir 33%, debu 39%, dan liat 28%, dengan pH H₂O 6,36 dan daya hantar listrik 51 µS/cm. Kandungan C-organik sebesar 1,36% dan N-total 0,14% tergolong rendah, sedangkan unsur fosfor dan kalium berada pada tingkat memadai. Serai menjadi komoditas yang paling diminati (83,3%), diikuti jahe (50,0%), sementara 63,6% responden yang menjawab menyatakan tertarik menerapkan polikultur. Hasil kegiatan menunjukkan bahwa penyuluhan efektif meningkatkan pemahaman peserta serta menghasilkan arahan awal berupa penambahan bahan organik, penerapan konservasi tanah dan air, pengembangan demplot polikultur secara bertahap, dan pemanfaatan Trichoderma sebagai agen pengendali hayati. Namun, analisis tanah pada beberapa titik tetap diperlukan untuk menghasilkan rekomendasi yang lebih spesifik lokasi.
Co-Authors Arif Rahman Karisna Margi Sasono Oktira Roka Aji umi salamah Yudi Ari Adi, Yudi Ari