The increasing consumption of electrical energy and still dependent on non-renewable energy has encouraged the implementation of effective, efficient, and environmentally friendly technologies to produce electrical energy. Microbial Fuel Cell (MFC) is one of the alternative technologies that utilize microorganisms in converting chemical energy from organic compounds under anaerobic conditions to be converted into electrical energy. The study was conducted to determine the potential of electrical energy generated from the treatment of eceng gondok waste (Eichhornia crassipes) with variations in the addition of buffer solutions and combinations of electrolyte solutions using the microorganism Saccharomyces cerevisiae through Microbial Fuel Cell technology. This study consists of three stages and methods, namely sample preparation, MFC media preparation, and analysis of pH, current, voltage, and power density. Measurement of the value of the maximum voltage, maximum current and power density is carried out every 3 hours for 27 hours for each treatment. The results were obtained as follows consecutively: firstly, for variations without the addition of buffers and electrolyte solutions are 0.25 volts; 0.08 mA; 13.05 mW/m2, secondly, with buffer and electrolyte solution KMnO4 0.2 M are 1.12 volts; 0.77 mA; 562.92 mW/m2, and thirdly, with buffer and K3Fe(CN)6 0.2 M are 0.47 volts; 0.48 mA; 147.26 mW/m2. Based on the results of the study, it was concluded that the most optimal variation in producing electrical energy was in the variation in the addition of a phosphate buffer and 0.2 M KMnO4 solution. Eceng gondok waste has the potential to be used as a source of electrical energy.

This study aims to look at the factors that influence student anxiety in facing clinical nursing practice. This research is a quantitative study using a cross-sectional study design approach. The results showed that the majority of respondents (69.14%) were female, 56 people, and most of the 39 respondents (48.1%) of all respondents had moderate anxiety. In addition, 51 respondents (63%) had good knowledge, up to 52 respondents (64.2%) had good skills, 61 respondents (75.3%) had significant supervisory influence, and 46 respondents (56.8% ) had an excellent environmental effect. In conclusion, there is an important relationship between knowledge, skills, supervisors, and the environment with students' anxiety in facing clinical nursing practice.   Keywords: Anxiety, Nursing, Students, Clinical Practice

Bertani merupakan sumber mata pencaharian utama penduduk Indonesia yang tinggal di daerah pedesaan, salah satunya adalah jagung. Hasil jagung dipengaruhi oleh banyak faktor antara lain, iklim yang selalu berubah, ketersediaan air, kesuburan tanah, sistem pengelolaan tanaman dan lain sebagainya. Pada saat observasi awal kepada kelompok tani kegagalan sering juga di alami karena adanya gangguan hama babi pada saat malam hari. Sehingga diperlukan suatu sistem yang dapat mengendalikan penanggulangan hama babi dengan cara membuat perangkap menggunakan alat setrum. Untuk mengubah arus DC (Direct Current) menjadi AC (Alternating Current) bisa dilakukan dengan rangkaian transistor daya. Transistor daya yang dirancang adalah dengan menggunakan metode flip-flop, kedua transistor akan bekerja secara bergantian, pengubah jenis ini termasuk kedalam pengubah satu fasa.  Tujuan dalam penelitian ini untuk membuat alat pengendali pagar kebun berbasis mikrokontroler. Alat ini mampu memberikan alternatif dalam memudahkan petani melakukan kontrol lahan sehingga terhindar dari hama babi. Hasil uji coba Alat pengubah arus DC ke AC d lapangan sangat berfungsi dengan baik sihingga petani tidak lagi mengalami gangguan hama babi di malam hari.