This study aims to identify and analyze the impact of the Covid-19 pandemic on online platformbased business activities in Jakarta. The research method used is descriptive qualitative method, using secondary data sources from research results, references and online news related to research. The study period was conducted from January to mid-April 2020. Data collection techniques using documentation techniques. It was found that the impact of the Covid-19 pandemic, clustered in 3 business activity states, first the business survived or stable, the second business declined and the third business flourished. Stable business through adjusting interaction models using online application platforms is education, especially for food / beverage delivery and basic needs, and health products. The declining business is based on visits or the presence of consumers in places heavily affected by the Covid-19 pandemic, such as public transportation, tourism, hospitality, offline retail, shopping centers, transportation of people and goods. Businesses that are developing due to market dynamics and interaction adjustments using online application platforms such as telecommunications business, online shopping (basic needs and health products), pharmaceuticals, health products, including MSMEs that have switched innovatively to produce health products needed in the Covid-19 pandemic.

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Misuse and overuse of antibiotics are potential causes of the increasing prevalence of antibiotic resistance (ABR). Having information about the knowledge, attitude, and practices concerning antibiotics use by the public might help control ABR growth. Therefore, this cross-sectional study aimed to investigate the levels and associated factors of knowledge, attitude, and practice (KAP) of antibiotics use among the public. A questionnaire was designed and validated, which consisted of a total of 51 questions with four sections: demographics (6), knowledge (20), attitude (12), and practice (13) to measure KAP. Univariate analysis (using Mann–Whitney U and Kruskal–Wallis analysis) was applied to assess the differences in the mean scores of KAP. Linear regression analysis was performed to identify factors associated with KAP. Finally, using Spearman analysis we have examined the correlation between responses to the KAP. The sample size of this study was 575, with a 99.96% response rate. Regarding knowledge, 73.12% of respondents stated that antibiotics could be used to treat viral infections, and 63.35% of respondents answered that antibiotics could reduce fever. Concerning attitude, 50% of respondents had considered stopping taking antibiotics as soon as symptoms had disappeared. In analyzing practice, we found 40% of respondents obtained antibiotics from a pharmacy without a prescription from a physician, a nurse, or a midwife. Statistical analysis revealed that KAP about antibiotic use was significantly associated with gender, area of residence, level of education, and monthly income (p < 0.05). Our findings concluded that men, respondents with low income, those with low-level education, and those living in rural areas are more prone to excessive use of antibiotics without knowing the adverse effects of improper use and how it can contribute to high ABR. So it is urgently necessary to strengthen policies on antibiotics use, including drug provision, distribution, and sales. In addition, people with low KAP should be a priority consideration in education outreach initiatives.

Abstract-This paper presents modeling of a simple but efficient photovoltaic water pumping system. The system employs maximum power point tracker (MPPT). Two MPPT algorithms, subsystems and control methods will be modeled and simulated using Matlab and Simulink with actual irradiance data. Simulation results will be presented in terms of performance parameters such as total energy produced and total volume of water pumped per day. The results further validate that MPPT can significantly improve efficiency and performance of PV water pumping system compared to the system without MPPT.

This research conduct base from increasing the National Examination standards from recent years, and overload student's learning activity in Senior High Scholl (SMA). These conditions as triggers stress students, from a long time, its influence on their learning. Based that, the research is to identify level of student academic stress, and differences base gender, and school location. This research use Cluster Random Sampling. Samples are grouped into 3 (three), that's school is located in downtown, midtown PENDAHULUANMasa remaja merupakan masa storm and stress, di mana merupakan masa yang bergolak dan berisi konflik serta perubahan suasana hati. , yang dapat menyebabkan depresi Lazaratou & Soldatos , 2010). Kondisi ini disebabkan karena banyaknya goncangan-goncangan dan perubahan yang cukup radikal dari masa sebelumnya .Perubahan tuntutan belajar dari masa sebelumnya juga menyebabkan munculnya gejala stress. Kondisi ini antara lain disebabkan oleh tuntutan yang tinggi terhadap prestasi siswa. Dari tahun ke tahun Kementerrian Pendidikan dan Kebudayaan menetapkan standar kelulusan yang selalu meningkat. Di samping itu pemerintah Abstract This research conduct base from increasing the National Examination standards from recent years, and overload student's learning activity in Senior High Scholl (SMA). These conditions as triggers stress students, from a long time, its influence on their learning. Based that, the research is to identify level of student academic stress, and differences base gender, and school location. This research use Cluster Random Sampling. Samples are grouped into 3 (three), that's school is located in downtown, midtown PENDAHULUANMasa remaja merupakan masa storm and stress, di mana merupakan masa yang bergolak dan berisi konflik serta perubahan suasana hati. , yang dapat menyebabkan depresi Lazaratou & Soldatos , 2010). Kondisi ini disebabkan karena banyaknya goncangan-goncangan dan perubahan yang cukup radikal dari masa sebelumnya .Perubahan tuntutan belajar dari masa sebelumnya juga menyebabkan munculnya gejala stress. Kondisi ini antara lain disebabkan oleh tuntutan yang tinggi terhadap prestasi siswa. Dari tahun ke tahun Kementerrian Pendidikan dan Kebudayaan menetapkan standar kelulusan yang selalu meningkat. Di samping itu pemerintah Lazaratou & Soldatos , 2010). Kondisi ini disebabkan karena banyaknya goncangan-goncangan dan perubahan yang cukup radikal dari masa sebelumnya .Perubahan tuntutan belajar dari masa sebelumnya juga menyebabkan munculnya gejala stress. Kondisi ini antara lain disebabkan oleh tuntutan yang tinggi terhadap prestasi siswa. daerah kabupaten dan kota juga menuntutdan kadangkal menekan pihak sekolah agar mencapai prestasi yang tinggi serta tingkat kelulusan siswa yang harus mendekati 100 %. Di pihak lain beban belajar siswa di SMA juga ditrasa banyak. Tuntutan yang tinggi itu seringkali menjadi pemicu munculnya stres pada peserta didik, khususnya pada mereka yang tidak memiliki kesiapan dan kedisiplinan dalam belajar. Menurut Baldwin (dalam Desmita...