Judul: Model Simulasi Penanganan Tebu Tebangan di PG Subang PTP XIV Cirebon
Abstrak: Transportasi tebu adalah salah satu kegiatan yanq berperan penting dalam proses produksi gula, yang t e r l e t a k diantar a dua kegiatan y a i t u keglatan penebangan dan penggillngan. Keglatan yang termasuk dalam s i k l u s transportasi tebu adalah kegiatan pemuatan tebu d a r l areal perkebunan ke pabrik, kegiatan pembongkaran tebu d a r i a l a t angkutnya d i pabrik serta d a r i pabrik kembali ke areal.
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Judul: Simulasi model sistem pengendalian tebangan dan angkutan tebu di Pabrik Gula Karangsuwung, Cirebon
Abstrak: Dalam upaya menekan serendah mungkin impor gula, peme- rintah telah mencanangkan swasembada gula, seperti dikeluar- kannya Inpres No: 19 tahun 1975 tentang Program Tebu Rakyat Intensifikasi (TRI). Di PG. Karangsuwung permasalahan yang sering dihadapi diantaranya: (a) tebu terlambat/ terlalu cepat ditebang, (b) jumlah tebu yang ditebang terlalu banyak atau sebaliknya, (e) jumlah tenaga tebang yang terlalu besar, (d) distribusi angkut kurang efektif. alat Tebu setelah dipanen mutunya hanya dapat dipertahankan beberapa lama. Tebu yang dibiarkan atau tertunda digiling akan mengalami kerusakan sehingga menurunkan kadar gula dan menaikkan gula invert, dengan demikian rendemen dari tanaman tebu tersebut semakin rendah. Dalam simulasi yang dikembangkan ini digunakan model- model yang sederhana di dalam usaha untuk mencapai tujuan yang diharapkan. Model yang dikembangkan ini terdiri dari lima model, yaitu: (1) model prioritas penebangan, (2) model perencanaan jadwal tebang, (3) model kebutuhan tenaga tebang, (4) model kebutuhan alat angkut, dan (5) model analisa biaya. Sebagai dasar pertimbangan untuk menentukan prioritas penebangan adalah: (a) kapasitas giling pabrik, (b) analisa...
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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