Judul: Potential Mixed Waste of Green Bean Sprouts and Cow Manure for  Producing Biogas
Abstrak: Biogas merupakan gas yang dapat menyala yang dihasilkan oleh mikroba anaerobik apabila bahan organik mengalami fermentasi dalam suatu keadaan anaerob yang sesuai dengan kondisi temperatur suhu dan derajat keasamannya. Tujuan penelitian ini yaitu menganalisis potensi campuran kotoran sapi dan limbah tauge kacang hijau sebagai penghasil biogas. Perlakuan penelitian ini dengan tiga perlakuan yaitu kontrol komposisi campuran kotoran sapi dan limbah tauge kacang hijau yaitu S100T0 (100% kotoran sapi), S75T25 (75% kotoran sapi + 25% Limbah tauge) dan S50T50 (50% kotoran sapi + 50% limbah tauge). Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan tiga kali pengulangan. Data yang diperoleh dianalisis dengan ANOVA satu faktor dan diuji lanjut dengan uji tukey, hasil penelitian menunjukkan bahwa campuran kotoran sapi dan limbah tauge berpengaruh nyata (P<0.05) terhadap produk produksi biogas dan kadar metan yang dihasilkan. Suhu harian pada biogas terjadi perbedaan antara suhu pagi, siang dan sore hari. Suhu siang hari dominan lebih tinggi dibandingkan suhu pagi dan sore yaitu berkisar antara 28,5-29 ˚C. Derajat keasaman (pH) cenderung tidak stabil naik turun dari pH 5,5-7. Kandungan total solid dan volatile solid awal cenderung lebih tinggi dibandingkan total solid dan volatile solid akhir. Warna api yang dihasilkan dengan penambahan limbah tauge berwarna biru sedangkan perlakuan kontrol menghasilkan api berwarna kuning. Rata-rata Kadar metan yaitu pada perlakuan S100T0 sebesar 4,34%, perlakuan S75T25 sebesar 27,39% dan perlakuan S50T50 menghasilkan kadar metan sebesar 35,3%. Penambahan limbah tauge kacang hijau dengan kombinasi 50% kotoran sapi dan 50% limbah tauge berpotensi sebagai penghasil biogas yaitu dapat meningkatkan kandungan metan pada biogas yang dihasilkan., Biogas is a gas that can ignite produced by anaerobic microbes when organic matter ferments in an anaerobic state that corresponds to temperature conditions, the degree of acidity. The purpose of this study is to analyze the potential of been sprout waste and cow manure mixture as a producer biogas. The treatment of this study with three treatment is control of the composition of the mixture of cow manure and and bean sprout waste green beens namely S100T0 (100% cow manure), S75T25 (75% Cow manure + 25% Bean sprout waste) and S50T50 (50% cow manure + 50% Bean sprout waste). The study used a complete randomized design (RAL) with three repetitions. The data obtained was analyzed with one factor ANOVA and tested futher with Tukey test, The results showed that the mixture of bean sprout waste and cow manure had a real effect (P<0.05) on biogas production products and methane levels produced. Daily temperature in biogas occurs the difference between morning, afternoon and afternoon temperatures. The dominant daytime temperature is higher than the morning and afternoon temperatures which range from 28.5-29 °C. The degree of acidity (pH) tends to be unstable up and down from Ph 5.5-7. The content of total solid and early volatile solid tends to be higher than the final total solid and volatile solid. The color of the fire produced by the addition of bean sprout waste is blue while the control treatment produces yellow flames. The average methane level is in the treatment of S100 T0 by 4.34%, the S75 T25 treatment by
Keyword: biogas, been sprouts waste, cow manure

Judul: Biogas Production from a Mix of Cow Manure with corn straw (Zea mays. L)
Abstrak: Biogas merupakan salah satu sumber energi alternatif yang dapat diperbarui karena menggunakan bahan baku yang berasal dari kotoran ternak. Tujuan penelitian ini adalah menganalisis roduksi dan kualitas biogas dari campuran kotoran sapi dengan jerami jagung (Zea mays. L). Penelitian dilakukan dengan 3 perlakuan yaitu kontrol sebanyak 100% kotoran sapi + 0% jerami jagung (S100J0), 75% kotoran sapi + 25% jerami jagung (S75J25), serta 50% kotoran sapi + 50% jerami jagung(S50J50) dan masing-masing 3 kali ulangan dengan analisis data menggunakan rancangan acak lengkap (RAL). Hasil penelitian menunjukkan bahwa campuran biogas kotoran sapi dengan jerami jagung berpengaruh nyata (P>0,05) terhadap produksi biogas yang dihasilkan (S100J0) menghasilkan produksi biogas yang paling tinggi. Suhu harian rata-rata hampir sama untuk semua perlakuan yaitu 27- 29 °C. Kandungan TS, VS awal dan akhir berturut-turut untuk S100J0, S75J25, dan S50J50 14,940; 12,916; dan 13,873. VS awal 12,660; 10,903; dan 10,996. TS akhir 10,643; 7,900; dan 10,550. VS akhir 6,286; 4,546; dan 7,323. Perlakuan S100J0 menghasilkan produksi yang lebih tinggi dan perlakuan penambahan jerami jagung 50% menghasilkan kualitas api yang baik berwarna biru, Biogas is a renewable alternative energy source because it uses raw materials derived from livestock manure. The purpose of this study was to analyze the production and quality of biogas from a mixture of cow dung and corm straw (Zea mays L). The study was conducted with 3 treatments, namely control as much as 0% corn straw or 100% cow dung (S100J0), 75% cow dung + 25% corn straw (S75J30), and 50% cow dung + 50% corn straw (S50J50) and 3 replications each with data analysis using a completely randomized design (CRD). The results showed that the mixture of cow dung biogas and corn straw had a significant effect (P>0,05) on the production of biogas (S100J0) produces the highest biogas production. The average daily temperature was almost the same for all treatments, namely 27-29 0C. The initial and final TS, VS content for S100J0, S75J25, and S50J50 14,940; 12,916; and 13,873. respectively. Initial VS 12,660; 10,903; and 10,996. Final TS 10,643; 7,900; and 10,550, and final VS 6,286; 4,546; and 7,323. The S100J0 treatment resulted in higher production and the addition of 50 % water hyacinth resulted in a good quality blue flame.
Keyword: alternative energy, biogas, corn straw, cow manure

Judul: Asymptotic Distribution of Estimator for the Intensity Function of a Doubly Periodic Poisson Process
Abstrak: In this manuscript, estimation of the intensity function of a doubly periodic Poisson process is discussed. It is assumed that only a single realization of the Poisson process is observed in a bounded window [0,n]. It is also assumed that the period of the intensity function is known. The rate of consistency and asymptotic normality of the estimator are formulated. Finally, a confidence interval for the local intensity function is also formulated.
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