Judul: Energy Analysis On Coal Steam Power Plant Pt. Energi Alamraya Semesta
Abstrak: Coal fired power plant system is the most type of power plant which has been used by national electric company (PLN) to fulfilled national electricity supply and also to reduce the dependency on diesel power plant system. The aim of this study is to knows energy efficiency on coal steam power plant in PT. Energy Alamraya Semesta and to analize factors which has been influenced the main equipment on coal steam power plant. The result shows that the capacity of power plant is 15 MW by using bituminous coal with Gross Calorific Value (GCV) 3575 cal/g, but daily acctual production only 10 MW. Total energy needed by equipments to support the production system is 1.3 MW. The average efficiency of coal steam power plant in PT. Energi Alamraya Semesta during the month of April 2012 was 87% and total power plant efficiency is 18 %.
Keyword: 

Judul: Estimation of Coal Calorific Savings and  Development Strategy for Co-Firing Method as an Alternative Energy Source (Case  Study of PLTU XY)
Abstrak: Metode co-firing di PLTU XY telah dilakukan sejak tahun 2021. PLTU XY masih menghadapi masalah dalam memenuhi target Energi Baru Terbarukan (EBT) karena bauran biomassa yang terbatas dan kurangnya diversifikasi sumber energi. Penelitian bertujuan untuk (1) mengestimasi besar penghematan kalor batubara dan besaran biaya produksi dari pemanfaatan limbah sawdust dalam metode co-firing di PLTU XY, serta (2) merumuskan strategi pengembangan untuk mendukung transisi energi bauran EBT. Metode analisis data dalam penelitian mencakup analisis substitusi net kalor, biaya produksi, dan perbandingan antara metode co firing dan coal firing, serta evaluasi menggunakan metode Strengths, Weaknesses, Opportunities, Threats (SWOT) dan Interpretive Structural Modelling (ISM). Hasil penelitian menunjukkan bahwa (1) rata-rata total kalor terpakai sebesar 494.855.853.354,08 kcal saat metode co-firing. Konsumsi batubara pada metode coal firing rata-rata sebesar 402.679.610.537,75 kcal. Penghematan kalori terjadi karena nilai kalor sawdust yang lebih rendah, sehingga membutuhkan lebih banyak batubara. Meskipun total konsumsi bahan bakar lebih tinggi, Specific Fuel Consumption (SFC) lebih rendah karena produksi listrik jauh lebih besar. Biaya produksi listrik co-firing tercatat Rp 21,89% lebih murah dibandingkan dengan coal firing. SFC pada metode co-firing adalah 0,617 kg/kWh, lebih rendah dibandingkan dengan coal-firing yang 0,907 kg/kWh. (2) strategi pengembangan meliputi pemenuhan infrastruktur penyimpanan biomassa dan diversifikasi sumber biomassa
Keyword: energi baru terbarukan, Interpretative Structural Modelling, Serbuk Kayu, net kalor

Judul: Durability of Specific Immunoglobulin (Ig) Y Againts Influenza and Covid-19 in Sunscreen
Abstrak: The benefit of specific immunoglobulin Y (Ig Y) as an active ingredient in personal care products such as sunscreen has not been properly studied. Our study aims to evaluate the reliability of specific IgY against influenza and the COVID-19 virus in a sample sunscreen product. Specific IgY influenza and COVID-19 viruses were inserted in the sample sunscreen at two concentrations of 0.1% and 0.25%. Three treatments were observed: control (C) sunscreen without IgY, treatment 1 (T1) sunscreen with 0.1% IgY, and treatment 2 (T2) sunscreen with 0.25% IgY. Organoleptic observations were carried out to monitor changes in aroma, color, and texture, and sunscreen sampling was done every week for 6 weeks. The durability of IgY was evaluated using an enzyme-linked immunosorbent assay (ELISA) and a neutralization assay. Organoleptic observation from weeks 1 to 6 showed consistency in its aroma, color, and texture. Enzyme-linked immunosorbent assay and neutralization assay (NA) results of the T1 and T2 groups showed negative results except for sample T1 at week 5, which showed a positive result in the Influenza A ELISA. Based on the results, it seems that IgY concentrations of 0.1% or 0.25% were not optimal. However, this negative result might be due to low concentration of the IgY and the presence of beeswax, which inhibits IgY and causes it to dissolve in distilled water, thus preventing it from being detected in the assay.
Keyword: Immunoglobulin Y, Sunscreen, Influenza, COVID-19, Biological Activity