Judul: Efficiency of Financial Performance of  BAZNAS, Rumah Zakat, and Inisiatif Zakat Indonesia During the Covid-19 Pandemi
Abstrak: Pandemi Covid-19 menyebabkan sektor ekonomi Indonesia terkena dampaknya. Dalam upaya pemulihan sektor ekonomi, Indonesia sebagai negara yang memiliki mayoritas penduduk muslim dapat memaksimalkan dana zakat, infak, dan sedekah (ZIS) melalui Organisasi Pengelola Zakat (OPZ). Penelitian ini bertujuan untuk menganalisis tingkat efisiensi BAZNAS, Rumah Zakat dan Inisiatif Zakat Indonesia selama pandemi Covid-19 dan mengetahui perbedaan tingkat efisiensi sebelum dan saat pandemi Covid-19. Penelitian ini terdiri dari dua tahap, tahap yang pertama yaitu pengukuran efisiensi menggunakan Data Envelopment Analysis (DEA). Tahap kedua menggunakan uji beda untuk mengetahui perbedaan tingkat efisiensi sebelum dan saat pandemi Covid-19. Hasil penelitian pada tahap pertama menunjukan bahwa sebelum pandemi LAZ Rumah Zakat tahun 2018 dan BAZNAS 2019 mengalami inefisiensi. Sedangkan saat pandemi LAZ Inisiatif Zakat Indonesia 2020 dan BAZNAS 2021 juga mengalami inefisiensi. Selanjutnya, tahap kedua uji beda menunjukan bahwa tidak ada perbedaan yang signifikan antara nilai efisiensi sebelum pandemi dan saat pandemi Covid-19., The Covid-19 pandemic has affected the Indonesian economic sector. In an effort to restore the economic sector, Indonesia as a country with a majority Muslim population can maximize zakat, infaq, and alms funds (ZIS) through the Zakat Management Organization (OPZ). This study aims to analyze the level of efficiency of BAZNAS, Rumah Zakat and Inisiatif Zakat Indonesia during the Covid-19 pandemi and find out the differences in efficiency levels before and during the Covid-19 pandemi. This research consists of two stages, the first stage is efficiency measurement using Data Envelopment Analysis (DEA). The second stage uses a different test to find out the difference in efficiency levels before and during the Covid-19 pandemi. The results of the research in the first stage show that before the pandemi LAZ Rumah Zakat in 2018 and BAZNAS 2019 experienced inefficiencies. Meanwhile, during the LAZ pandemi, the 2020 Indonesian Zakat Initiative and BAZNAS 2021 also experienced inefficiencies. Furthermore, the second stage of the different tests showed that there was no significant difference between the efficiency values before the pandemi and during the Covid-19 pandemi
Keyword: DEA, Difference Test, Efficiency, OPZ

Judul: Strategi Optimalisasi Pendayagunaan Zakat, Infak, dan Sedekah dalam Program Ketahanan Pangan Dimasa Covid-19 di Indonesia (Studi kasus: Badan Amil Zakat Nasional)
Abstrak: The existence of new mustahik due to the establishment of the community's economy due to the COVID-19 pandemic has disrupted their purchasing power, especially in meeting their food needs. The permitting of ZIS funds by the Indonesian Ulema Council, made BAZNAS through various programs also optimize the role of ZIS through the ZIS utilization program based on strengthening food security and people's purchasing power. However, the impacts of the program cannot be said to be fully optimal because there is still an inconsistency between material improvement and the mindset of mustahik to get out of poverty, as well as the limited area under the program. The aims of this study are (1) to determine the parameters of each internal and external factor using the IFE-EFE matrix, (2) to analyze the quadrant position of BAZNAS to determine alternative strategies using the SWOT matrix, and (3) to determine the priority of the main strategy to recommend using the Analytical Process method. Network (ANP). The results show that the main priority strategy is to build technology-based local institutions to support the activities of the fostered mustahik from upstream to downstream (G1) with the acquisition of a geometric mean value of 0.1460 and a rater agreement of W= 0.66., Adanya mustahik baru karena terdampaknya perekonomian masyarakat akibat pandemi covid-19 menyebabkan terganggunnya kemampuan daya beli mereka, khususnya dalam memenuhi kebutuhan pangannya. Diperbolehkannya dana ZIS oleh Majelis Ulama Indonesia, membuat BAZNAS melalui berbagai lembaga program juga mengoptimalkan peran ZIS melalui program pendayagunaan ZIS berbasis penguatan ketahanan pangan dan daya beli masyarakat. Namun, dampak program belum sepenuhnya dapat dikatakan optimal karena masih adanya ketidakselarasan antara peningkatan materi dengan pola pikir mustahik untuk keluar dari kemiskinan, serta masih terbatasnya wilayah binaan program. Tujuan penelitian ini adalah (1) Mengidentifikasi parameter dari setiap faktor internal dan eksternal menggunakan IFE-EFE matriks, (2) Menganalisis kuadran posisi BAZNAS untuk menentukan alternatif strategi menggunakan SWOT Matriks, dan (3) Menentukan prioritas utama strategi alternatif untuk rekomendasikan dengan metode Analytical Network Process (ANP). Hasil penelitian menunjukkan strategi prioritas utama adalah dengan membangun kelembagaan lokal berbasis teknologi untuk menunjang aktivitas mustahik binaan dari hulu ke hilir (G1) dengan perolehan nilai geometric mean sebesar 0,1460 dan nilai kesepakatan (rater agreement) sebesar W= 0,66.
Keyword: Analytical Network Process (ANP), Covid-19, Strategy recommendations, SWOT, Utilization of ZIS

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.
Keyword: