Judul: Kepedulian Konsumen Terhadap Label Halal Dalam Melakukan Pembelian Produk Pangan Secara Online Di Jabodetabek
Abstrak: Saat ini produk halal sedang menjadi trend konsumsi untuk berbagai kalangan, baik di Indonesia maupun di luar Indonesia. Produk pangan yang dijual secara online tersebut tidak semuanya pasti produk pangan halal. Permasalahan tersebut mengakibatkan adanya masyarakat muslim yang terjebak saat ingin membeli produk pangan tersebut. Adanya label halal dalam kemasan produk akan memudahkan konsumen untuk mengidentifikasi produk layak untuk dikonsumsi atau tidak terutama untuk konsumen Muslim. Penelitian ini bertujuan untuk mengetahui kepedulian konsumen terhadap label halal dalam melakukan pembelian produk pangan secara online di Jabodetabek. Metode yang digunakan yaitu metode survei. Jumlah populasi sebesar 18.928.217 jiwa dan jumlah sampel yang digunakan sebanyak 236 orang. Sampel ditentukan dengan metode convenience sampling. Data yang digunakan dalam penelitian ini dianalisis menggunakan analisis deskriptif untuk mengindentifikasi tingkat pengetahuan konsumen mengenai sertifikasi dan label halal. Metode analisis crosstab dan chi-square test digunakan untuk menganalisis variabel bebas yaitu pengetahuan produk halal, kesadaran halal, norma subjektif yang memengaruhi variabel terikat keputusan pembelian. Tingkat pengetahuan konsumen mengenai sertfikasi dan label halal sudah cukup baik. Hasil analisis mengunakan metode crosstab dan chi-square test menunjukkan bahwa pengetahuan produk halal, norma subjektif dan kesadaran halal yang didalamnya terdapat poin penting mengenai label halal berpengaruh positif secara signifikan terhadap keputusan pembelian konsumen., Currently, halal products are becoming a consumption trend for various groups, both in Indonesia and outside Indonesia. Not all of the food products sold online are definitely halal food products. These problems resulted in the existence of Muslim communities who were trapped when they wanted to buy these food products. The existence of halal labels in product packaging will make it easier for consumers to identify products that are suitable for consumption or not especially for Muslim consumers. This study aims to determine consumer awareness of halal labels in purchasing food products online in Jabodetabek. The method used is the survey method. The total population is 18,928,217 people and the number of samples used is 236 people. The sample was determined by the convenience sampling method. The data used in this study were analyzed using descriptive analysis to identify the level of consumer knowledge about halal certification and labeling. Crosstab and chi-square test analysis methods are used to analyze independent variables, namely knowledge of halal products, halal awareness, subjective norms that influence the dependent variable purchasing decisions. The level of consumer knowledge regarding halal certification and labeling is quite good. The results of the analysis using the crosstab and chi-square test methods show that knowledge of halal products, subjective norms and halal awareness in which there are important points regarding halal labels have a significant positive effect on consumer purchasing decisions.
Keyword: Crosstab, halal, halal labels, level of knowledge, purchasing decisions

Judul: Faktor-faktor yang Memengaruhi Keputusan Konsumen  Muslim DKI Jakarta dalam Membeli Suplemen Kesehatan Berlabel Halal
Abstrak: Halal tidak hanya sebatas pada makanan dan minuman saja, tetapi juga untuk semua kebutuhan hidup lainnya, termasuk produk farmasi suplemen kesehatan. Menurut LPPOM MUI, suplemen kesehatan perlu dicermati kehalalannya karena tidak semua produk suplemen sudah bersertifikat halal dan memiliki beberapa titik kritis kehalalan. Penelitian ini bertujuan untuk mengidentifikasi karakteristik dan persepsi konsumen muslim mengenai keberadaan label halal pada suplemen kesehatan serta menganalisis faktor-faktor yang memengaruhi keputusan pembelian terhadap produk suplemen kesehatan berlabel halal. Penelitian dilakukan di DKI Jakarta dengan mengambil sampel sebanyak 100 responden. Metode yang digunakan yaitu analisis deskriptif dan analisis regresi logistik. Hasil penelitian menunjukkan bahwa pengetahuan halal, halal awareness, harga, kualitas produk dan pendapatan berpengaruh signifikan terhadap keputusan konsumen muslim DKI Jakarta dalam membeli suplemen kesehatan berlabel halal., Halal is not only limited to food and beverages, but also for all other necessities of life, including dietary supplements, which are pharmaceutical products. According to LPPOM MUI, halal dietary supplements need to be observed because not all supplement products are halal certified and have several critical points of halalness. This study aims to identify and perceive Muslim consumers regarding the existence of halal labels on health supplements and analyze the factors that influence purchasing decisions for health supplement products labeled halal. The study was conducted in DKI Jakarta by taking a sample of 100 respondents. The methods used are descriptive analysis and logistic regression analysis. The results show that halal knowledge, halal awareness, price, product quality, and income have a significant effect on the decisions of Muslim consumers in DKI Jakarta when buying dietary supplements labeled halal.
Keyword: dietary supplement, halal label, logistic regression, purchase  decision

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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