Judul: Profil Senyawa Bioaktif Ekstrak Etanol Tanaman Brokoli (Brassica oleracea var. Italica) dengan Pemberian Pupuk Biokonversi Maggot Black Soldier Fly.
Abstrak: Brokoli merupakan tanaman hortikultura yang ditanam di kawasan dataran tinggi, salah satunya di Desa Sindangjaya Kecamatan Cipanas Kabupaten Cianjur. Penelitian bertujuan menganalisis pengaruh aplikasi pupuk kompos hasil biokonversi Black Soldier Fly (BSF) terhadap tinggi tanaman, jumlah daun, bobot basah, bobot kering serta persentase berbunga dan kandungan senyawa bioaktif ekstrak etanol tanaman brokoli. Penanaman brokoli dilakukan selama 14 minggu dengan 3 macam perlakuan yaitu kontrol (P1), penambahan pupuk kandang (P2) dan penambahan pupuk biokonversi maggot (P3). Setiap perlakuan dilakuan ulangan sebanyak 3 kali yang di dalamnya terdapat 10 tanaman dan dilakukan dalam 3 kelompok sehingga terdapat 270 tanaman brokoli yang ditanam. Penambahan pupuk biokonversi maggot mampu meningkatkan produksi tanaman sesuai dengan hasil penelitian yang berpengaruh nyata pada tinggi tanaman, jumlah daun, bobot basah dan kering serta persentase berbunga. Metode LC-MS/MS yang digunakan untuk identifikasi senyawa aktif pada ekstrak etanol 80% brokoli menunjukkan terdapat 58 senyawa bioaktif yang masuk ke dalam golongan metabolit sekunder, asam amino, lipid, amina, asam karboksilat, purin, pirimidin dan produk turunan klorofil.
Keyword: broccoli, LC-MS/MS, secondary metabolites, maggot bioconversion fertilizers

Judul: Morphological Profile and Bioactive Compounds of  Lemongrass (Cymbopogon citratus) with the Application of Black Soldier Fly (Hermetia  illucens) Maggot Biocontrol Fertilizer
Abstrak: Maggot Black Soldier Fly (BSF) sebagai agen biokonversi limbah organik mampu menghasilkan bahan stabil, seperti kompos. Serai dapur merupakan tanaman rempah yang diketahui memiliki banyak manfaat terhadap kesehatan. Penelitian ini bertujuan menganalisis pengaruh aplikasi kompos hasil biokonversi maggot BSF terhadap profil senyawa bioaktif ekstrak etanol tanaman serai dapur. Metode penanaman serai dapur dilakukan di lahan pertanian Desa Sindangjaya yang disusun berdasarkan rancangan kelompok lengkap teracak dengan faktor tunggal. Pengaplikasian pupuk kompos hasil biokonversi maggot BSF pada media tanam serai dapur berpengaruh nyata terhadap pertumbuhan tinggi tanaman (usia 4, 6, 8, 10, 12 MST) dan bobot basah (batang, daun, akar, dan total rumpun). Ekstraksi dilakukan dengan metode maserasi menggunakan pelarut etanol 96% yang selanjutnya diidentifikasi menggunakan instrumen LC-MS/MS. Perbedaan perlakuan aplikasi pupuk memengaruhi komposisi senyawa bioaktif tanaman ini. Secara keseluruhan teridentifikasi sebanyak 48 senyawa yang berhasil teridentifikasi dan pada masing-masing variabel sejumlah 37 senyawa (P1), 30 senyawa (P2), dan 35 senyawa (P3). Senyawa termasuk golongan asam amino, terpenoid, alkaloid, kuinolin, karbohidrat, metoksifenol, benzodioxole, difenilmetana, steroid, dan senyawa golongan lain., Maggot Black Soldier Fly (BSF) as a bioconversion agent of organic waste is able to produce stable materials, such as compost. Lemongrass is a spice plant that known to have many health benefits. This study aims to analyze the effect of the application of BSF maggot bioconverted compost on the profile of bioactive compounds in ethanol extract of lemongrass plants. Lemongrass cultivation method is carried out on the agricultural land of Sindangjaya Village which is prepared based on the randomized complete group design with a single factor. The application of BSF maggot bioconverted compost to the growth medium in lemongrass significantly affected the growth of plant height (age 4, 6, 8, 10, 12 WAP) and wet weight (stems, leaves, roots, and total clumps). Extraction was performed by maceration method using 96% ethanol solvent which further identified using the LC-MS/MS instruments. Overall, 48 compounds were identified and in each variable there are 37 compounds (P1), 30 compounds (P2), and 35 compounds (P3). Compounds are including to the groups of amino acids, terpenoids, alkaloids, quinolines, carbohydrates, methoxyphenol, benzodioxole, diphenylmethane, steroids, and other group compounds.
Keyword: BSF, maggot, profil senyawa, pupuk kompos, serai dapur

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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