Judul: Polutant impact to efficiencies tambaks in district Karawang
Abstrak: Organic Loading is mainly due to the remaining feed and feces inedible shrimp and fish metabolism. Organic waste from intensive and semi-intensive pond directly into the aquatic ecosystem without passed the treatment of sewage disposal ponds lead to eutrophication, excessive turbidity, sedimentation, and salinization toxicity of aquatic habitats, causing further production efficiency and productivity of farms decreased. The purpose of this study were: (1) estimate the efficiency of production of the farms in the district of Karawang (2) estimate the effect of pollutants nitrogen, phosphorus and BOD and mangroves for pond production efficiency, and (3) estimate the total factor productivity of farm enterprises in the district of Karawang. The results showed that the business had milkfish monoculture farms are technically efficient with an average rate of 84.1 percent, but it is allocative and economically inefficient with an average of 59.2 percent and 48.9 percent. Production factors that have a positive and significant effect on the production of milkfish monoculture farm business is feed, milkfish stock, urea fertilizer, labor, fuel and extensive ponds. Total factor productivity monoculture farms ranged from 59.7 - 138.7, with an average of TFP at Fishpond milkfish monoculture of 92.4. There are 21.8 percent businesses of monoculture ponds achieve high technical efficiency and TFP. Technical efficiency is very significant to TFP, so increasing the technical efficiency will increase total factor productivity of farm businesses. Based on the concentration of nitrogen, phosphorus and BOD monoculture farm businesses included in the criteria for mild to moderate polluted. There is a tendency of higher technical efficiency of farm businesses will increasingly small percentage of lost production and cost of damages from pollutants as a source of inefficiency.
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Judul: Keterkaitan Produktivitas Primer dengan Bahan Organik di Tambak Udang Intensif
Abstrak: Kondisi kualitas air yang perlu menjadi perhatian di ekosistem tambak adalah peningkatan bahan organik. Bahan organik tersebut akan mengalami dekomposisi oleh bakteri dan hasilnya yang berupa nutrien akan dimanfaatkan oleh fitoplankton melalui proses produksi primer. Penelitian ini bertujuan menganalisis keterkaitan antara produktivitas primer dengan bahan organik di tambak udang intensif. Penelitian dilakukan pada bulan September hingga Desember 2018. Parameter suhu, kecerahan, salinitas, pH, oksigen terlarut, produktivitas primer diamati secara in situ. Parameter bahan organik, nutrien (nitrit, nitrat, amonia, ortofosfat), rasio C/N dianalisis di laboratorium. Analisis keterkaitan produktivitas primer dengan bahan organik dilakukan menggunakan korelasi Pearson. Hasil penelitian menunjukkan semua parameter masih berada pada kisaran yang aman untuk kegiatan budidaya udang vaname sistem intensif. Produktivitas primer menunjukkan korelasi negatif dengan bahan organik, sedangkan produktivitas primer berkorelasi positif dengan nutrien. Produktivitas primer lebih menunjukkan kedekatan dengan nutrien daripada bahan organik., Water quality conditions that need attention in the pond ecosystem are the increasing of organic matter. The organic matter will be decomposed by bacteria and the results will be utilized by phytoplankton through a primary productivity process. This study aims to analyze the relationship between primary productivity and organic matter in intensive shrimp ponds. The study was conducted from September to December 2018. Temperature, brightness, salinity, pH, dissolved oxygen, primary productivity were observed in situ. While organic matter, nutrients (nitrite, nitrate, ammonia, orthophosphate), and C/N ratio were analyzed in the laboratory. Analysis of the relationship between primary productivity and organic matter was carried out using Pearson correlation. The results showed that all parameters were still in a safe range for the intensive system of vaname shrimp cultivation. Primary productivity shows negative correlation to organic matter, while primary productivity has positive correlation to nutrients. Primary productivity shows more proximity to nutrients than organic matter.
Keyword: organic matter, nutrients, primary productivity, intensive ponds

Judul: Perbandingan Algoritma Message Digest 5 (MD5) Dan Secure Hash Algorithm 1 (Shai) Untuk Autentikasi Pesan
Abstrak: Seiring dcngan meningkatnya penggunaan internet sebagai media pertukaran pcsan. metodc pcngamanan pcsan menjadi sangat penting. Nilai suatu pesan yang ingin dijaga keutuhan atnu intcgritasnya menycbabkan pesan tcrscbut hanya baleh dimodifikasi olch pihak yang bcrhak. Namun pada rcalitanya, pesan tersebut akan mendapat ancaman dari scorang penyusup. Bentuk ancaman terjadi apabiJa pcnyusup dcngan suatu cara. dapat mengubah isi pesan terscbut untuk bcrbagai kepcntingan. Apabila isi pesan telah bcrubah dad bentuk aslinya, maka pesan terscbut dikatakan sudah tidak aulcnlik (asli) Iagi. Snatn metodc yang efektif untuk mcnguji kcautentikan suatll pesan digllnakan tcknik kriptografi. Pada kal)'a ilmiah ini akan dibahas algoritma Message Digest 5 (MDS) dan Secure !-lash Algorithm (SHAI) untuk autentikasi pesan.
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