Judul: Faktor-Faktor yang Memengaruhi Jumlah Tabungan Koperasi Syariah Pada Masa Pandemi Covid-19 (Studi Kasus: KSPPS Tadbiirul Ummah, Bogor, Jawa Barat)
Abstrak: Pandemi Covid-19 memberikan dampak tidak hanya dibidang kesehatan, namun juga dibidang perekonomian. Salah satu lembaga keuangan yang merasakan dampak pandemi Covid-19 adalah Koperasi Simpan Pinjam dan Pembiayaan Syariah (KSPPS). Penurunan jumlah pihak yang menabung sebagai akibat dari pandemi Covid-19 akan membawa dampak negatif bagi KSPPS. Penelitian ini bertujuan untuk mengetahui faktor-faktor yang memengaruhi jumlah tabungan KSPPS Tadbiirul Ummah pada masa pandemi Covid-19. Adapun metode pengambilan sampel pada penelitian menggunakan Incidental Sampling dengan analisis data menggunakan analisis deskriptif dan regresi berganda. Berdasarkan hasil analisis regresi linear berganda variabel penjelas yang berpengaruh signifikan terhadap tabungan KSPPS Tadbiirul Ummah adalah variabel pendapatan, pelayanan, dan kenaikan harga. Hasil penelitian ini diharapkan memberikan kontribusi dan manfaat bagi berbagai pihak baik nasabah, KSPPS, dan pihak lainnya yang berkepentingan., The Covid-19 pandemic has an impact not only to the health sector, but also to the economic sector. One of the financial institutions that feel the impact of the Covid-19 pandemic is KSPPS. The decrease of people who do saving as a result of the Covid-19 pandemic will have an adverse impact on KSPPS. Therefore, the factors that affect the savings of KSPPS Tadbiirul Ummah during Pandemi Covid-19 will be examined. The sampling method in this study was Incidental Sampling and the data analysis used descriptive analysis and multiple regressions. Based on the results of analysis of multiple linear regression, variables that have a significant effect on the savings in KSPPS Tadbiirul Ummah were income, service, and price increase. The results of this study are expected to provide contributions and benefits to various parties such customer, KSPPS, and other interested parties.
Keyword: Income, Price increase, Savings, Service, Sharia cooperative

Judul: Faktor-Faktor yang Mempengaruhi Keputusan Menabung di Bank Syariah Selama Pandemi COVID-19
Abstrak: The Indonesian Government's policy regarding Large-Scale Social Restrictions (PSBB) in the context of accelerating the handling of the Corona Virus Disease 2019 (COVID-19) caused a decline in the economy and household income and led to an increase in the unemployment rate in Indonesia. On the other hand, the decline in the economic sector did not interfere with public demand for Islamic savings products in Indonesia. this is evidenced by the increasing number of sharia customers and deposits and stable FDR of sharia banks in the range of 77-100 percent since before and during the COVID-19 pandemic. This study aims to determine the characteristics and factors that influence the decision to save at Islamic banks during the COVID-19 pandemic. The sample used in this study amounted to 400 respondents. Data collection using a questionnaire distributed online. Based on the data obtained, the characteristics of the respondents in this study were dominated by respondents in the age range of 17-25 years, the majority of respondents live in West Java and work as a student. Furthermore, the data will be analyzed using logistic regression analysis. Based on the results of logistic regression, the variables of religiosity, knowledge, promotion, location and age have a posit ive and significant effect on decisions to save in Islamic banks during the COVID-19 pandemic. Keywords: COVID-19, Logistics Regression, Savings Decisions, Sharia Savings., Kebijakan Pemerintah Indonesia mengenai Pembatasan Sosial Berskala Besar (PSBB) atau sekarang dikenal dengan Pembatasan Pergerakan Kegiatan Masyarakat (PPKM) dalam rangka percepatan penanganan Corona Virus Disease 2019 (COVID-19) menyebabkan terjadinya penurunan pada perekonomian dan pendapatan rumah tangga serta menyebabkan terjadinya peningkatan angka pengangguran di Indonesia. Di sisi lain, penurunan sektor ekonomi tersebut tidak mengganggu permintaan masyarakat terhadap produk tabungan syariah di Indonesia. Hal ini dibuktikan dengan jumlah nasabah dan DPK syariah yang terus meningkat serta Financing to Deposit Ratio (FDR) bank syariah yang stabil pada range 77-100 persen semenjak sebelum dan selama pandemi COVID-19. Penelitian ini bertujuan untuk mengetahui karakteristik dan faktor-faktor yang mempengaruhi keputusan menabung di bank syariah selama pandemi COVID-19. Sampel yang digunakan pada penelitian ini berjumlah 400 responden. Pengambilan data menggunakan kuesioner yang disebar secara online. Berdasarkan data yang didapatkan, karakteristik responden pada penelitian ini di dominasi oleh responden pada range usia 17-25 tahun, mayoritas responden berdomisili di Jawa Barat dan berprofesi sebagai pelajar/mahasiswa. Selanjutnya, data akan dianalisis menggunakan analisis regresi logistik. Berdasarkan hasil regresi logistik, variabel religiusitas, pengetahuan, promosi, lokasi dan usia berpengaruh positif dan signifikan terhadap keputusan menabung di bank syariah selama pandemi COVID-19. Kata kunci: COVID-19, Keputusan Menabung, Regresi Logistik, Tabungan Syariah.
Keyword: Logistics Regression, Savings Decisions, Sharia Savings, COVID-19

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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