Judul: Effect of Stunning and Regaining  Conciousness’ Water Media Temperature on Survival Rate and Quality of Tilapia  (Oreochromis niloticus)
Abstrak: Suhu media air merupakan salah satu faktor penting yang perlu diperhatikan dalam pemingsanan dan pembugaran ikan nila. Aliran listrik pada media air dengan suhu yang berbeda akan menghasilkan kuat arus yang berbeda. Suhu media air pembugaran yang berbeda dapat mempengaruhi waktu bugar ikan nila. Penelitian ini bertujuan untuk menentukan pengaruh suhu media air (20, 25, 30) ºC pembugaran yang terbaik setelah penyimpanan beku (-13 ºC) terhadap survival rate dan kualitas ikan nila (O. niloticus). Suhu media air pemingsanan ikan nila dengan kejut listrik terbaik yaitu pada suhu 10 ºC dengan rata-rata waktu pingsan sebesar 17,56±2,83 detik. Suhu media air pembugaran 20 ºC memiliki waktu bugar terlama dibandingkan pada suhu 30 ºC. Survival rate ikan nila pada suhu media air pembugaran 20 ºC menunjukkan nilai yang tertinggi. Kondisi mata dan insang ikan nila terlihat lebih baik pada suhu media air pembugaran 20 ºC., Water temperature is an important factor during the stunning and revitalize of tilapia. Electric current at different water temperatures will produce different strong electric currents. Additionally, different water temperatures can affect the regaining conciousness’ time of tilapia. This study aims to determine the effect of water temperature (20, 25, 30) ºC on the recovery, the survival rate and quality of tilapia (Oreochromis niloticus) after frozen storage (-13 ºC) on. The stunning water temperature of tilapia with the best electric shock was at a temperature of 10 ºC with an average fainting time of 17.56±2.83 seconds. The water temperature of 20 ºC was the longest regaining conciousness’ time compared to 30 ºC. The survival rate of tilapia at a water temperature of 20 ºC showed the highest value. The condition of the eyes and gills of tilapia were better at a water temperature of 20 ºC.
Keyword: electric shock, survival rate, tilapia, Kejut listrik, nila

Judul: Effect of Electric Shock and Frozen Temperature Storage on the Survival Rate of Tilapia (Oreochromis niloticus).
Abstrak: Transportasi sistem kering dapat diterapkan dengan menggunakan metode pemingsanan kejut listrik. Pemingsanan dengan kejut listrik hanya dapat membuat ikan pingsan dalam waktu yang cukup singkat. Penyimpanan ikan hidup dalam suhu beku terbukti masih memberi peluang ikan tersebut untuk hidup setelah dibugarkan. Penelitian ini bertujuan untuk menentukan tegangan kejut listrik pada pemingsanan ikan nila (Oreochromis niloticus), menentukan lama waktu pemberian gliserol, serta menentukan lama waktu penyimpanan suhu beku terhadap survival rate ikan nila. Penelitian ini menggunakan perlakuan tegangan kejut listrik 220 volt untuk pemingsanan dan larutan gliserol 5% dengan lama perendaman 5 menit. Rata-rata waktu menjelang pingsan ikan nila dengan kejut listrik 220 volt yaitu 0,39 menit dan rata-rata waktu menjelang bugar 2,57 menit. Nilai kelangsungan hidup ikan nila setelah dilakukan penyimpanan suhu beku selama 90 sampai 150 menit yang diberikan perlakuan pemingsanan kejut listrik dan perendaman gliserol adalah 33,3% sampai 100%. Suhu lingkungan ikan nila yang dibawah suhu normal memengaruhi tingkat kelangsungan hidup, glukosa darah, serta kondisi fisik dan organ ikan., Dry system of fish transportation can be applied using the electric shock as fish stunning method. However, stunning with an electric shock can only knock a fish out for a short period of time. Storage of live fish in frozen temperatures is proven to give the fish a chance to live after being revitalized. This study aimsed to determine the electric shock voltage for tilapia (Oreochromis niloticus) stunning, the length of time for glycerol administration, and the length of frozen time in storage on the survival rate of tilapia. This study used an electric shock treatment of 220 volts for stunning and 5% glycerol solution with 5 minutes of immersion. The average time before tilapia faints with a of 220 volts electric shock was 0.39 minutes and the average time before getting fit was 2.57 minutes. The survival rate of tilapia after being stored at freezing temperature for 90 to 150 minutes given the treatment of electric shock and glycerol immersion were 33.3% to 100%. The environmental temperature of tilapia that was below normal temperature affects the survival rate, blood glucose, as well as the physical condition and organs of the fish.
Keyword: Electric shock, Freezing temperature, Glycerol, Survival rate, Tilapia fish

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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