Judul: Analisis Kemunduran Mutu Udang Vaname (Litopenaeus vannamei) secara Kimiawi dan Mikrobiologis
Abstrak: Shrimp is perishable commodity susceptible to damage and quality deterioration. This research aimed to assess the deterioration process by organoleptic, chemical and microbiological characteristics. The organoleptic characteristic was used to determine the degradation phase. Prerigor phase in shrimp was happened for 0-2 days, rigor mortis for 3-11 days, postrigor happened for 12-17 days, and deterioration after 17 days of storage. Chemical characteristics of degradation were determined by pH value, total volatile base (TVB), indole, and activity of polyphenoloxidase enzyme. Microbiological characteristics of degradation were determined by total plate count (TPC) and spoilage bacteria. The value of pH, TVB, and TPC increased in regard with vaname shrimp degradation. Enzymatic activity of PPO occurred intensely during rigor mortis phase. Bacteria found in the shrimp were proposed as Gram negative and Gram positive by Gram staining.
Keyword: Bogor Agricultural University (IPB), TVB., TPC, pH, organoleptic, degradation, indole, PPO enzyme

Judul: Kemunduran Mutu Udang Putih: Organoleptik, Blackspot, Histologis, dan Enzimatis
Abstrak: White shrimp (Litopenaeus vannamei) has a short term degradation because its surface area is tinier than fish. The aim of this research to determine the degradation process by organoleptic, blackspot, histologic, and enzymatic activities of catepsine. The result of organoleptic that pre rigor phase in shrimp happened for 0-2 days, rigor mortis happened for 3-11 days, post rigor happened for 12-17 days, and deterioration happened more than 18 days after incubation. The blackspot had started to cephalothorax and pereiopod. The result of histology shows that the muscle fibers in pre rigor still looked compact and dense, the muscle fibers in rigor mortis began shrinkage, the muscle fibers in rigor mortis shrinkage caused empty space. The biggest value of enzymatic activities for catepsin happened at rigor mortis phase.
Keyword: Litopenaeus vannamei, degradation, histology, cathepsin enzym, Blackspot

Judul: Desain Sistem Transfer Energi Nirkabel Berbasiskan Tesla Coil
Abstrak: Tesla coil merupakan alat yang ditemukan oleh Nikola Tesla yang dapat mentransmisikan daya tanpa kabel dengan memanfaatkan prinsip induksi elektromagnetik. Pada penelitian ini dibuat sebuah prototype Tesla Coil dengan menggunakan transistor C1970 dan receiver menggunakan rangkaian LC. Identifikasi alat meliputi pengaruh daya input transmitter terhadap receiver, bentuk signal yang dipancarkan transmitter, pengaruh jarak transmitter dan receiver, nilai efisiensi serta efek alat terhadap perangkat lain. Hasil pengamatan menunjukkan bahwa semakin besar daya input maka semakin besar daya yang dipancarkan oleh transmitter. Bentuk sinyal yang dipancarkan oleh transmitter berupa gelombang listrik AC sinusoidal dengan frekuensi ~2.9 MHz. Semakin jauh jarak receiver terhadap transmitter maka semakin kecil amplitudo gelombang AC yang diterima oleh receiver, menyebabkan semakin kecil daya yang diterima oleh receiver. Adapun nilai efisiensi terbesar penangkapan daya oleh receiver yaitu sebesar 0.00516 % serta terdapat gangguan pada alat-alat tertentu seperti monitor komputer dan radio.
Keyword: rangkaian LC, receiver, tesla coil, transistor C1970, transmitter