Program Aplikasi Steganografi Menggunakan Metode Spread Spectrum pada Perangkat Mobile Berbasis Android

The exchange of traffic information in cyberspace grows fast. In all areas of life utilize technology to exchange information. One of the media owned by many people is mobile device such as mobile phone and tablet computer. In fact many people have been using mobile devices for information exchange function, and expect information to be transmitted quickly, accurately, and safely. The information security sent will be very important when the information is confidential. One way to secure information sent is the concealment of information into a media so that information hidden is beyond recognition by the human senses, which is commonly referred to steganography. This research studied and implemented steganography using spread spectrum Method on Android-based mobile devices. The results showed that the inserted image before and after the message was inserted is not different with PSNR value of about 75

Pendeposisian Sambungan P-n Cuinse2 Multilayer-zno dengan Metode Rf Sputtering dan Karakterisasinya

Telah dilakukan penumbuhan kristal CuInSe2 yang digunakan sebagai material target dengan metode Bridgman, pendeposisian sistem p-n junction CuInSe2 multilayer – ZnO dengan teknik RF sputtering dan karakterisasinya. Deposisi dilakukan dengan tingkat kevakuman mencapai 3,5x10-5 mbar, dengan tekanan argon sebesar 3x10-2 mbar, tegangan self –bias 1075 V, daya RF 200 W dan jarak elektroda 20 mm. Tegangan anoda ambang sebesar -10 V diberikan pada proses sputtering untuk mengoptimalkan sifat masing-masing lapisan, serta mampu menaikkan daya pada proses sputtering sebesar 24,4 %. Hasil XRD menunjukkan bahwa kristal CuInSe2 yang terbentuk berstruktur tetragonal khalkopirit dengan konstanta kisi a = 5,77278 Å dan c = 11,61888 Å. Dari Hasil XRD diketahui bahwa lapisan CuInSe2 multilayer telah terdeposisi pada substrat kaca dengan konstanta a = 5,67355 Å dan c = 11,57093 Å. Berdasarkan uji FPP lapisan CuInSe multilayer merupakan semikonduktor tipe-p dengan hambatannya (1,41 ± 0,03)x102 Ω dan nilai resistivitasnya (1,63 ± 0,04) Ωcm. Dari uji Spektrofotometer UV-vis diketahui bahwa lapisan CuInSe2 multilayer merupakan absorber yang baik pada panjang gelombang 300nm – 500nm. Pengamatan EDX memperlihatkan CuInSe2 multilayer terdeposisi di atas kaca dengan perbandingan molaritas Cu:In:Se adalah 0,35:0,93:2. Dari hasil SEM diperoleh ketebalan lapisan sebesar (1,441 ± 0,005) μm dengan laju deposisi sebesar 0,7206x10-1 μm/menit. Kata kunci: semikonduktor, CuInSe2/multilayer ZnO p-n junction, lapisan tipis, ohmi

Stress Indicator, Carcass Composition, and Meat Cholesterol of Kampung-Broiler Crossbred Chicken Treated by Different Stocking Density

This study aimed to investigate the effect of stocking density on stress indicator, carcass composition, and meat cholesterol content of kampung–broiler crossbred chicken. Anamount of 90 DOCs of crossbred kampung-broiler (KB) were placed into 9 plots sized 1x1 m2 in semi closed house that consist of 3 stocking densities 8, 10 and 12 birds m-2 and respectively 3 replicates. The chickens were fed commercial broiler feed. Approximately ± 30% roosters slaughtered for analysis of malondialdehyde, carcass quality, and meat cholesterol. Malondialdehyde, carcass composition, and meat cholesterol was completely randomized designed with different stocking densities treatments and three replicates. Data was analyzed using analysis of variance (ANOVA) and had previously been tested for requirement of variance test assumption. Data of temperature humidity index (THI) was descriptively explained. The results showed that the effect of different stocking densities on stress indicator reflected by THI value and MDA content, carcass composition (percentage of carcass and abdominal fat weight), and cholesterol level were not significant. The different of stocking densities (8, 10 and 12 birds m-2) did not affect the stress indicators reflected by THI and MDA level, carcass composition and meat cholesterol level. Kampung-broiler crossbred chicken could develop at 8, 10 or 12 birds m-2 densities since the lower of abdominal fat and meat cholesterol were resulte

Isolasi Dan Identifikasi Bakteri Resisten Herbisida Glifosat Dan Paraquat Dari Rizosfer Tanaman Padi - (Isolation and Identification of Resistant Bacteria to Glyphosate and Paraquat Herbicide From Rhizosphere of Rice Plants)

Glyphosate and paraquat are broad-spectrum herbicides that commonly used in rice fields to control weeds. This study aims to isolate and identificate bacteria from rhizosphere of rice plants which resistant to glyphosate and paraquat herbicides. Thirty bacterial isolates were isolated from rhizosphere of rice plants and screened for their resistance of glyphosate and paraquat herbicides. One isolate was resistant to 4,000 ppm of glyphosate and 1,600 ppm of paraquat. Based on Biolog omniLog identification system, isolate 4.2 was identified as Ensifer meliloti