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: Analysis of Factors Affecting Islamic Banking Financing during the COVID-19 Pandemic
Abstrak: Penyebaran COVID-19 menjadi salah satu ancaman terbesar bagi ekonomi global dan pasar keuangan di dunia. Penelitian ini dilakukan untuk mengetahui pengaruh faktor-faktor yang memengaruhi pembiayaan bagi hasil selama pandemi COVID-19 terhadap perbankan syariah di Indonesia. Penelitian ini menggunakan sampel 13 Bank Umum Syariah dan 20 Unit Usaha Syariah serta periode waktu kuartal I-IV 2020. Alat analisis yang digunakan dalam penelitian ini adalah regresi data panel dengan pendekatan Random Effect Model (REM). Hasil penelitian menunjukkan bahwa DPK, NPF, FDR, ROA, PDB, inflasi dan jumlah uang beredar secara simultan berpengaruh terhadap pembiayaan bagi hasil. Untuk hasil estimasi secara parsial, variabel DPK, FDR, dan ROA berpengaruh signifikan dan positif terhadap pembiayaan bagi hasil. Sedangkan variabel NPF, PDB, inflasi, dan jumlah uang beredar tidak berpengaruh signifikan terhadap pembiayaan bagi hasil., The spread of COVID-19 is becoming one of the biggest threats to the global economy and financial markets in the world. This study is conducted to determine the effect of the factors that influence profit-sharing financing during the COVID-19 pandemic on Islamic banking in Indonesia. This study uses a sample of 13 Islamic Commercial Banks and 20 Sharia Business Units and the time period is quarter I-IV 2020. The analytical tool used in this study is panel data regression with the Random Effect Model (REM) approach. The results indicate that DPK, NPF, FDR, ROA, GDP, inflation and the money supply simultaneously has an effect on profit sharing financing. For the partial estimation results, the variables of DPK, FDR, and ROA have a significant and positive effect on profit sharing financing. While the variables of NPF, GDP, inflation, and the money supply have no significant effect on profit sharing financing.
Keyword: COVID-19, financial performance, Islamic banking financing, macroeconomics, panel data

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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