Judul: Karakteristik Fisik dan Kimia serta Uji Toksisitas Tepung Pupa Ulat Sutera (Samia cynthia) Pemakan Pemakan Pemakan Pemakan Daun Jarak (Ricinus communis).
Abstrak: Pupa ulat sutera merupakan salah satu edible insects yang dapat dimanfaatkan sebagai bahan pangan alternatif di masa mendatang. Tujuan dari penelitian ini adalah untuk mempelajari karakteristik fisik dan kimia serta uji toksisitas tepung pupa Samia cynthia. Penelitian ini dilaksanakan pada bulan Februari hingga Juni 2017. Tahapan dalam penelitian ini meliputi tahap pembuatan tepung pupa Samia cynthia, analisis karakteristik kimia tepung pupa Samia cynthia pada tiga suhu pengeringan, analisis karakteristik fisik tepung pupa Samia cynthia terpilih, dan uji toksisitas tepung pupa Samia cynthia terpilih dengan metode BSLT (Brine Shrimp Lethality Test).
Keyword: Edible insects, Ricinus communis, Samia cynthia

Judul: Physicochemical Characteristics of Eri  Silkworm Pupae Flour (Samia cynthia ricini) with Different Particle Sizes.
Abstrak: Pupa adalah hasil samping di pengolahan serat sutra. Penggunaan pupa yang kurang optimal dapat menyebabkan pencemaran lingkungan. Sebagai produk pangan, diperlukan uji analisis sifat fisikokimia sehingga diketahui nilai gizinya. Sifat fisikokimia dianalisis dengan uji pH, uji aw, warna, dan analisis proksimat. Adanya pengayakan tepung pupa dilakukan dengan tujuan menghomogenkan ukuran partikel. Analisis data yang digunakan adalah Uji T-Independen. Hasil menunjukkan bahwa pH, aw, kadar air, kadar lemak, protein ukuran partikel 80 mesh tepung pupa lebih baik dari ukuran partikel 60 mesh. Akan tetapi, kadar abu, serat kasar, dan karbohidrat pada tepung 60 mesh lebih baik dari ukuran partikel 80 mesh. Ukuran partikel tidak memengaruhi karakteristik fisikokimia tepung pupa., Pupa is a byproduct in the processing of silk fiber. Suboptimal use of pupa can lead to environmental pollution. As a food product, it is necessary to conduct a physical-chemical analysis to determine its nutritional value. Physical-chemical properties are analyzed through pH testing, water activity (aw) testing, color analysis, and proximate analysis. Sieving of pupa flour is carried out with the aim of homogenizing particle size. The data analysis used is the Independent T-Test. The results show that pH, aw, moisture content, fat content, and protein content of 80 mesh pupa flour are better than that of 60 mesh particle size. However, ash content, crude fiber, and carbohydrates in 60 mesh flour are better than that of 80 mesh particle size. Particle size does not affect the physical-chemical characteristics of pupa flour.
Keyword: Fisikokimia, Proksimat, Pupa, Samia cynthia ricini, Tepung Pupa

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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