Judul: Study of reproduction performance of female African catfish (Clarias gariepinus) with supplemented by Ascorbyl Phosphate magnesium as a source of vitamin C in diets and implanted with estradiol-17β
Abstrak: The experiment was conducted to determine the effect of dietary ascorbyl phospahate magnesium as a source of vitamin C and implanted with estradiol-17 β on the gonad maturation, egg and larva quality of African Catfish Clarias gariepinus. Fish were treated by various combinations of dietary dosage of ascorbyl phosphate magnesium (0, 600, 1200, and 1800 mg/ kg of feed) and estradiol-17β (00, 250, and 500μ g/kg). Two hundreds sixteen and eighteen pairs of broodstock fish were used for this experiment. Fish were fed with the experimental diets two times a day at satiation. The gonad somatic index, egg diameter, fecundity, hatching rate of the eggs, survival rate, and percentage of abnormal larvae were determined. Results of the experiment indicated that supplementation of ascorbyl phosphate magnesium and estradiol-17β stimulated gonad development and increased hatching rate, fecundity and survival rate, and reduced percentage of abnormal larvae. Combination of ascorbyl phosphate magnesium 1200 mg/kg feed and estradiol-17β 250μ g/kg gave the best reproductive performance.
Keyword: African catfish, Clarias gaviepinus, Ascoryl phosphate magnesium, Reproduction performance

Judul: Induction of Gonad Maturation in Male Pearl Catfish (Clarias gariepinus) Using the Blood Plasma of Male Sheep
Abstrak: Pearl catfish (Clarias gariepinus) is one type of freshwater consumption fish with high economic value and is one of the main fishery commodities in Indonesia. One of the obstacles in catfish hatcheries is the availability of seeds thatdepend on spawning activities so that good broodstock quality is also needed. Thisstudy aims to test the induction of male catfish gonad maturation using ram blood plasma as a new alternative gonad maturation hormone. This study used complete randomized design consisting of three treatments with 15 individual replicates each.The method of hormone administration to be used is the intramuscular injection method. The results showed that the P1.0 treatment was the best treatment in increasing gonad maturation. The P1.0 treatment experienced the highest increase of 2.8 times (P < 0.05) when compared to the P0.0 treatment at the end of maintenance, while the P0.5 treatment experienced an increase of 1.6 times (P>0.05) when compared to the P0.0 treatment at the end of maintenance. The results showed that induction of gonadal maturation using ram blood plasma provedto be able to increase gonadal maturity in male catfish in 28 days of maintenance.
Keyword: Clarias gariepinus, gonads, sheep blood, spawning

Judul: Kerusakan bantalan rel kereta api di wilaya inspeksi 2 jalan dan bangunan perusahaan jawatan kereta api (pjka),cirebon
Abstrak: Kereta api merupakan salah satu sarana angkutan yang murah, cepat dan aman serta dapat mengangkut barang dalam jumlah besar. Kelancaran operasi sarana angkutan tersebut banyak ditentukan oleh kondisi jalan rel, termasuk kondisi bantalannya. Dalam hal ini bantalan rel kereta api dapat dibuat dari kayu, logam, atau beton. Namun demikian kayu merupakan bahan yang paling banyak digunakan sebagai pembuat bantalan rel kereta api di berbagai negara. Kenyataan menunjukkan bahwa kayu yang digunakan sebagai bantalan rel kereta api sering mengalami berbagai macam kerusakan yang menyebabkan bantalan tidak berfungsi lagi atau menurun fungsinya. Di Indonesia, informasi mengenai jenis dan tingkat kerusakan bantalan kayu masih sangat kurang, pada- hal informasi tersebut sangat penting sebagai dasar pertimbangan dalam rangka pemeliharaan jalan kereta api, agar umur pakainya (service life) lebih lama.
Keyword: bantalan rel