Judul: Pemanfaatan Alat Deteksi Bunyi untuk Menduga Kadar Air dan Viabilitas Benih Kedelai (Glycine max L. Merrill)
Abstrak: Quick detection of moisture content and seed viability is very important in seed technology. The use of sound frequency that produced by seed if that seed reflected with another material is one method that haven’t yet researched. The purpose of this research is sound detection to determine moisture content and viability of soybean seeds by looking the sound waves frequency produced. This research consisted of two experiments, the first experiment the effect size of seed and moisture content of the sound frequency. The second experiment the effect size of seed and viability of the frequency. This research was arranged in the randomized completely design was used with twofactorsis size of seed and moisture content (first experiment) and size of seed and viability (second experiment). The results showed that sound detection can used to estimate the moisture content of seed but can’t used to estimate viability of seed. Results showed that sound detection devices can be used to estimate the water content of seeds without seeing the size of the seed, but can’t used to estimate viability of seed. The first experiment had a negative correlation between the frequency and moisture content has a value of correlation (r) 0.95 approach 1 (≈ 1), it meansthe higher water content, the frequencies lower sound produced.
Keyword: 

Judul: Development of Non-Destructive Quality Testing of Corn (Zea mays) Seeds Using Acoustic Methods
Abstrak: Pengujian mutu benih dapat dilakukan secara langsung dan tidak langsung. Pengujian mutu secara tidak langsung dapat dilakukan menggunakan metode akustik (gelombang berdiri) dengan mengukur kemampuan benih menyerap gelombang bunyi. Penelitian ini bertujuan mengembangkan metode tidak langsung dan nondestruktif pengujian mutu vigor dan kadar air (KA) benih jagung berdasarkan absorpsi gelombang bunyi menggunakan metode gelombang berdiri. Penelitian dilaksanakan pada bulan Januari˗Maret 2023 di Laboratorium Penyimpanan dan Pengujian Benih dan Laboratorium Fisika Lanjut, IPB Dramaga, Jawa Barat. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal. Percobaan pertama dilakukan untuk memilih kombinasi jumlah benih (90; 120; 150 butir) dan 10 frekuensi (1275-5100 Hz, kelipatan 425 Hz) terbaik berdasarkan nilai koefisien absorpsi benih sebagai acuan percobaan selanjutnya. Percobaan kedua dilakukan dengan mengkombinasikan faktor KA (8,7%; 12,1%; dan 13,8%) dan frekuensi terpilih. Percobaan ketiga dilakukan dengan mengkombinasikan frekuensi terpilih dan tingkat vigor benih yang diperoleh dari pengusangan cepat. Hasil menunjukkan bahwa kombinasi 150 butir dan frekuensi terpilih 3400; 3825; 4250 Hz merupakan hasil terbaik untuk digunakan pada percobaan selanjutnya. Metode gelombang berdiri dapat membedakan tingkat KA 8,7% dan 13,8%, serta membedakan tingkat vigor benih jagung dengan tolok ukur radicle emergence pada frekuensi 3825 Hz. Metode tersebut dipengaruhi oleh ketebalan, densitas, dan susunan posisi benih., Seed quality testing can be conducted through direct and indirect methods. The indirect method can be conducted by acoustic methods (standing wave) which measures the sound wave absorption capacity of seeds. This study aimed to develop an indirect and non-destructive method for testing the quality of vigor and moisture content (MC) of corn seeds based on the absorption of sound waves using the standing wave method. The research was conducted from January to March 2023 at the Seed Storage and Testing Laboratory and Advanced Physics Laboratory, IPB Dramaga, West Java. This study used a single factor, Completely Randomized Design (CRD). The first experiment was conducted to choose the best combination of seed bulk (90; 120; 150 seeds) and 10 frequencies (1275-5100 Hz, the multiple of 425 Hz) based on the seed absorption coefficient to be used for the next experiments. The second experiment was carried out with the combination of MC (8.7%; 12.1%; 13.8%) and chosen frequencies. The third experiment was conducted within the combination of chosen frequencies and seed vigor levels obtained from accelerated aging. The result showed that the combination of 150 seeds and 3400; 3825; and 4250 Hz of chosen frequencies was the best result to be used for further experiments. The standing wave method could distinguish between 8.7% and 13.8% of MC levels, and distinguish the vigor level of corn seeds with the radicle emergence benchmark at 3825 Hz of frequency. This method is influenced by the thickness, density, and the formation of seed bulk
Keyword: 

Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf