Judul: Analisis Rembesan dan Gaya Angkat Pada Perencanaan Bendung di Desa Sungai Buntu, Kecamatan Pedes, Karawang.
Abstrak: The construction of a dam is built crossing river stream for elevating water level. In designing a dam, force field analysis in a dam is needed to ensure a dam can be operated properly. The focus of this research is to analize seepage and uplift pressure in a dam. The objective of this research is quantifying and analyzing the force that occurs in a dam as a reference in designing of a dam construction. The study is located in Sungai Buntu Village, Pedes, Karawang. The analysis is using guideline KP-02 Criteria for Designing Main Dam and KP-06 Criteria for Designing Additioal Structures. Software Geo Studio Seep/w 2004 is used in seepage analysis. The data which are required are soil permeability, and water level at upstream and downstream. The equipments used in this study are soil ring, tape, computer, and calculator. Based on the result of Geo Studio Seep/w 2004 analysis, the quantity of seepage under the Dam is 1,01 x10-8 m3/sec. Based on flow net analysis the quantity of seepage under the Dam is 1,72x10-8 m3/sec and the uplift pressure is 2450 kg/m.
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Judul: Kajian Dimensi Bangunan Spillway
Abstrak: Bangunan spillway merupakan bangunan hidrolika dari suatu bendungan yang berfungsi pada saat keadaan darurat (emergency), yaitu keadaan muka air pada saat volume tampungan banjir maksimum. Penelitian ini bertujuan untuk melakukan kaji ulang bangunan spillway pada Bendungan Randugunting berdasarkan kajian terhadap desain existing bangunan spillway, debit rencana bangunan spillway, kedalaman aliran kritis, dan profil muka air bangunan spillway. Tipe bangunan spillway yang direncanakan adalah tipe side spillway dengan tipe mercu Ogee. Hasil analisis luas catchment area Sungai Banyuasin adalah 17.39 km2 dengan panjang sungai 8.52 km. Nilai curah hujan rencana dengan periode ulang 1000 tahun adalah sebesar 180.40 mm. Hasil analisis debit rencana metode rasional sebesar 124.07 m3/det, sedangkan dengan metode HSS Nakayasu distribusi hujan 2 jam sebesar 207.40 m3 /det. Kedalaman aliran kritis di atas mercu bendung bangunan spillway diperkirakan setinggi 1.39 m. Elevasi muka air pada saat banjir maksimum adalah 95.66 mdpl di atas mercu bendung spillway, 88.78 - 90.11 mdpl di segmen saluran samping, 88.23 - 88.78 mdpl di segmen saluran transisi, 61.34 - 88.62 mdpl di segmen saluran peluncur, dan 66.28 mdpl di segmen akhir peredam energi., Spillway is a hydraulics building of a dam that functions during an emergency, when the water level of the maximum flood storage volume. This study aims to review the spillway building on the Randugunting Dam based on a study of the existing design of the spillway building, the design discharge of the spillway building, the critical flow depth, and the water level profile of the spillway building. The planned type of spillway building is a side spillway type with an Ogee crest type. The analysis of Banyuasin River catchment area are 17.39 km2 with the river length of 8.52 km. The result of the planned rainfall with a return period of 1000 years is 180.40 mm. The result of discharge with rational method is 124.07 m3/s, while with the Nakayasu HSS method the 2-hour rain distribution is 207.40 m3/s. The critical depth above the weir crest is estimated to be 1.39 m. The maximum water level during flooding is 95.66 masl above the spillway weir crest, 88.78 - 90.11 masl in the side channel segment, 88.23 - 88.78 masl in the transition channel segment, 61.34 - 88.62 masl in the drop channel segment, and 66.28 masl in the stilling basin segment.
Keyword: Critical flow depth, design discharge, water surface profile

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