Judul: Dampak Kehadiran Ritel Modern Terhadap Omzet Pedagang Pasar Tradisional Di Kota Surakarta Provinsi Jawa Tengah
Abstrak: Kehadiran ritel modern kian meningkat. Keberadaannya memberi ancaman bagi pedagang pasar tradisional. Penelitian ini bertujuan untuk menganalisis dampak kehadiran ritel modern terhadap omzet pedagang pasar tradisional di Kota Surakarta. Ritel modern yang termasuk pada penelitian ini terdiri atas supermarket, hypermarket, dan department store. Penelitian dilakukan pada tiga pasar tradisional di Kota Surakarta, yaitu Pasar Nusukan dan Pasar Hardjodaksino sebagai pasar perlakuan (pasar yang jaraknya dekat dengan ritel modern) dan Pasar Jongke sebagai pasar kontrol (pasar yang jaraknya jauh dengan ritel modern). Metode yang digunakan adalah t-test, chi-square test, uji korelasi dan ordinal logistic regression. Hasil penelitian diperoleh bahwa faktor-faktor yang memengaruhi omzet pedagang pasar tradisional adalah ukuran kios, komoditas utama berupa produk segar dan komoditas utama berupa produk olahan, sedangkan jarak tidak memengaruhi omzet pedagang pasar tradisional di Kota Surakarta.
Keyword: omzet, pasar tradisional, ritel modern

Judul: Dampak Kehadiran Ritel Modern terhadap Profitabilitas Pedagang Pasar Tradisional di Kota Bekasi
Abstrak: The aims of this research are to analyze the impact of modern retail on the profitability level of traditional market traders in Bekasi. The market selection is done by purposive sampling method. Jatiasih Market and Family Mart Market are selected as treatment group and Bantargebang Market is selected as control group. The methods using in this study are t-test, chi-square test, and ordinal logistic regression. Factors influencing changes of profit are the number of buyers, the distance between the traditional market with the modern retail, the main commodity of fresh products and processed products. The closer distance the traditional market to the modern retail, the more chance of traditional market traders to increase their profits.
Keyword: t-test, modern retail, traditional markets, ordinal logistic regression, profit, chi-square test

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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