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Community service has been carried out in RW 12 Kel. Merjosari Malang to increase the potential and participation of the community in health environment. The increase in the number of Covid-19 patients in Malang Raya, about 3,378 people, presents that the Covid-19 virus has increased drastically both number of patients confirmed positive and patients who died. The problems faced by partners are not understanding the Covid-19 disease, weak resources, limited funds, and difficulty accessing information. The method is socialization by conducting discussions, optimizing citizen resources, monitoring and evaluation. The result is conducting discussions, developing resources, providing training, providing counseling and assistance. Citizen involvement is to provide a place to install spraying equipment, maintain spraying facilities, provide a place to conduct training, provide human resources ready to be trained voluntarily. Citizens' anxiety and restlessness were slightly reduced by increased community understanding. Citizens give a positive assessment of service. This is proven by the percentage of residents giving a positive rating on average 95.68%, consisting of 95.33% giving a positive response, and 4.67% giving a negative response.

Penelitian lampu LED bawah air dilakukan untuk merancang dan membuat lampu LED bawah air sebagai alat bantu pemikat ikan, untuk menganalisis kekuatan bahan yang digunakan, untuk menganalisis nilai iluminasi cahaya dan distribusi yang dihasilkan dari lampu, dan untuk mendeskripsikan dan menganalisis hasil tes dari lampu LED bawah air. Penelitian ini dibagi atas tiga tahap, kegiatan pengujian material, perancangan dan pembuatan lampu LED bawah air, dan uji coba lapangan. Berdasarkan hasil penelitian menunjukkan bahwa nilai beban maksimum yang dapat ditahan oleh resin berkisar antara 914.27-1177.34 kgf/cm2 . Nilai beban maksimum yang dapat ditahan oleh akrilik 1.238.65-1539.30 kgf/cm2 . Desain instrumen dibangun untuk digunakan dalam air, dengan bahan dan resin akrilik sebagai perlindungan/ tahan air. Desain lampu yang dibuat terintegrasi dengan sistem kamera CCTV untuk memudahkan deteksi ikan. Lampu LED yang digunakan adalah jenis tipe RGB High Power LED 10 watt yang dihubungkan dengan water proof driver step down tipe CC-CV (QSKJ) LED driver dengan spesifikasi IN: DC.7-35V OUT: DC.2-30V. Jumlah driver yang digunakan adalah sebanyak 9 buah, dimana lampu bagian atas sebanyak 6 lampu dihubungkan dengan 1 driver untuk setiap warna. Sedangkan pada lampu bagian bawah, setiap 3 lampu dihubungkan dengan 1 driver pada setiap warna. Hasil pengukuran intensitas cahaya pada medium udara menunjukkan cahaya biru memiliki intensitas yang tertinggi dibandingkan dengan warna merah dan putih. Jenis ikan yang ditangkap selama 5 kali trip bagan apung adalah sebanyak 8 spesies, terdiri dari Auxis sp., Loligo sp., Rastrelliger sp., Trichiurus sp., Sardinella sp., Decapterus sp., dan Leiognathus sp. Hasil pengujian yang dilakukan selama 5 trip menunjukkan tangkapan dominan adalah ikan petek (Leiognathus sp.) sebanyak 288 spesies, dan Loligo sp. sebanyak 266 spesies. Rumpon elektronik pada bagan yaitu dengan menambah intensitas dan daya pada atraktor cahaya, serta adanya kajian lebih dalam terhadap frekuensi suara yang direspon oleh ikan.

This study investigated the influence of refraction index strength on the light propagation in refraction index-varied dielectric material. This dielectric material served as photonic lattice. The behavior of light propagation influenced by variation of refraction index in photonic lattice was investigated. Modes of the guiding light were determined numerically using squared-operator iteration method. It was found that the greater the strength of refraction index, the smaller the guiding modes.

Perovskite solar cells have attracted the researchers' attention because they are one of the most promising candidates that are cheap, easy to fabricate and high-efficiency solar cell. ZnO nanorods (ZnO NRs) can be used as an electron and hole recombination barrier to improve the perovskite solar cell performance. This research aimed to investigate the effect of growing time on the characteristics of ZnO NRs and its application for perovskite solar cell device. The ZnO NRs was synthesized on ITO substrate by hydrothermal method at the different growing times of 4, 6, and 8 hours. The CH3NH3PbI3 perovskite solar cells were deposited on the top of ZnO NRs/ITO thin films by a two-stage spin coating method. The solar cell devices were characterized by using XRD, SEM-EDX, FTIR, UV-vis, and LCR meter. The results showed that ZnO NRs/ITO thin films were formed homogeneously and vertically oriented on all ITO substrates with hexagonal structures of zincite phases. When the growing time of ZnO NRs increased, the degree of homogeneity, density, and length of the rods enhanced as well. All the samples have the bandgap around 3.05 eV. The FTIR results showed the absorbent functional forces at 870 cm−1 and 1250 cm−1 related with H-C-N wavelengths, and ZnO wavelength ranges from 400 to 515 cm−1. The CH3NH3PbI3 perovskite solar cell device still contained PbI2 as impurities phase. The longer the growing time, the rods resulted by ZnO NRs had the wider diameter and the longer length and they were more homogenous. Meanwhile, the effect of the number of PbI2 impurities resulted in the higher dielectric and smaller current.