Salah satu sumber energi terbarukan adalah solar cell yang menggunakan energi sinar matahari yang dapat digunakan untuk sistem pembangkit tenaga surya. Untuk mendukung kerja sistem pembangkit, sebelum energi listrik keluaran solar cell digunakan, perlu ditampung pada accumulator. Sistem charger accumulator otomatis dapat dirancang bangun dengan menggunakan dc to dc converter jenis full bridge converter yang dapat mengatur tegangan keluaran dengan masukan duty cycle PWM picuan 4 saklar elektronis yang terkonfigurasi pada untai tersebut. Modul kendali dibutuhkan untuk memberikan picuan pada full bridge converter berupa PWM dengan pengaturan duty cycle supaya tegangan keluaran stabil sesuai dengan set point yang dikehendaki. Pada pengujian, full bridge converter mempunyai effisiensi maksimal sebesar 97%. Set point kendali tegangan keluaran charger di atur sebesar 13,8 Volt, nilai rata-rata tegangan keluaran sebesar 13,77 Volt, nilai range 0,22 Volt dan mempunyai standar deviasi sebesar 0,06 pada keadaan tunak proses pengendalian.
<p>Tren yang berkembang saat ini adalah asi ekslusif yang diberikan kepada bayi sampai dengan bayi tersebut mempunyai usia yang cukup. Hal ini tentunya tidak terlalu bermasalah pada ibu rumah tangga yang sebagian besar waktunya berada di rumah, sehingga dapat menyusi bayi tersebut tanpa gangguan. Tetapi hal ini berbeda dengan wanita karir yang memiliki bayi dan ingin memberikan asi eksklusif, jarak yang jauh antara rumah dan tempat kerja serta keterbatasan waktu menjadi faktor penghalang yang membuat asi eksklusif menjadi sangat sulit diberikan oleh wanita karir kepada anaknya. Cooler box dapat menjaga agar suhu asi tetap dalam kondisi dingin mencegah kerusakan kandungan asi. Didalam cooler box dimasukkan ice gel yang membuat suhu tetap dingin. Ice gel tersebut dapat menjaga suhu tetap dingin selama 3-4 jam. Permasalahan lain adalah kehigienisan dari cooler box serta wadah penyimpan dari asi. Tidak jarang cooler box menjadi sumber bakteri yang dapat menyebar ke asi yang terdapat pada cooler box, hal ini bisa diakibatkan kelembapan ataupun dari tangan yang tidak steril. Hal ini dikarenakan dalam proses pumping serta pemindahan ke dalam cooler box masih menggunakan cara manual dengan tangan. Peneliti akan merancang bangun cooler box dengan menggunakan termoelektrik sebagai pendingin dari cooler box serta memiliki air sterilizer, yang berguna menurunkan jumlah bakteri dengan menggunakan uv light. Kadar bakteri yang rendah akan membuat cooler box menjadi lebih higienis sebagai tempat penyimpanan asi ketika akan dikirimkan.</p>
Energy conservation is an effort to increase energy efficiency. This research conducted an energy audit in the BPTIK (Badan Pengembangan Teknologi Informasi dan Komunikasi) department room at the Universitas PGRI Semarang, observing the value of electrical parameters, especially unbalanced voltage and current that have the potential to cause neutral currents. In this study the calculated unbalanced voltage value is 0.64% and unbalanced current is 20.25%. From the current development, the neutral current produces an average of 1.72 Amperes. From the value of the neutral current can be calculated the energy lost in the conductor neutral wire per day is about 0.01% of energy consumption by the load per day.Keywords: current, voltage, imbalance
Various insects (Arthropoda: Insecta) have an important role in the agricultural sector, including corn crops. Understanding the diversity of species and composition of insects in the plantation area is a necessary first step in implementing integrated pest management (IPM). This study aims to analyze the diversity of species and composition of insects found in corn plantation in the Malotong Village, Tojo Una-Una Regency, Central Sulawesi. Sampling was carried out in October and November 2022 using insect nets in four plots. A total of 21 species (16 families and four orders) were found in this study, with the order Hemiptera having the highest number of families and genus (7 families and 8 genera). The Shannon diversity index (H′) showed moderate criteria, with the highest found in plot 1 (H′=1,60), while the highest Evenness index values were found in plots 3 (0,77) and 4 (0,74). The highest similarity indexes were found in plots 2 and 3 (0,53), as a result of their shared vegetation patterns. The composition of insects consists of herbivores, predators, and pollinators, with the highest percentage being herbivores (68.5%), then predators (25%), and the lowest being pollinators (6.5%). Keywords: Abundance, Central Sulawesi, corn, IPM, Tojo Una-Una
The thermoacoustic engine can be a device to convert waste heat energy in the engine car become useful energy such as for charging battery in car or Air conditioner of the car. This work can be done by experimentally and numerically. There are some parameters that have an impact on the performance of the engine. They are geometry of the engines, working fluid, and mean pressure. The performance of the engine depends on the efficiency and the heating temperature. In the car, waste heat energy is not high enough. Therefore, we need to utilize the low heating temperature to be converted into useful energy. This study contributes to numerically the effect of mean pressure and loop’s radius of the regenerator on the onset temperature and the efficiency of traveling wave thermoacoustic engines. The application that is used to solve numerical problems is fortran95. There are two codings that are used in fortran95. They are stability limits and efficiency codes. The lowest onset temperature that achieved is 153˚C with efficiency up to 38.1% that can be reached when the mean pressure is 4.0 MPa and the loop's radius is 5 cm. This result indicated that we can use low heating temperatures from waste heat of engine car to turn on electronics equipment inside the car.
The purpose for this study is to convert mechanical vibration into electrical Power. Our target is to provide enough power for 1.2 V rechargeable battery having 160 . The investigation was conducted experimentally in electrical mechanical engineering laboratory. Four piezoelectric was connected to circuits in series mode called 1 module. In order to recharge the battery having voltage 1.2 volt, the measurement of the intensity of the loudspeaker was verified. According to table 1, it was found that at 2 of vibration is best because the value is 1.4 V nearest to 1.2 V. It was found that the mechanical vibration can be converted into electric power. It was found that to recharge 160 having 1.2 V, the 20 modules are needed.
Corn is the second food source of food after rice. The use of corn for the food industry is highly developed and varied for the middle and upper industries such as the light food industry, corn oil, cornstarch, grits, margarine, sugar and so on. However, on a farmer or small business scale, corn is generally only sold as snacks or snacks. In an effort to increase the added value and implementation of corn, it is necessary to process corn into corn cracker products. This study discusses (1) Knowing the quality of taste, aroma, texture and crispness of pulut crackers based on young corn and old corn, (2) As a source of information for making quality corn crackers and (3)This research uses a descriptive method that compares two or more facts, with the Multiple Linear Regression Analysis Method consisting of 2 processing of young corn crackers and old corn crackers, organoleptic tests conducted in 3 higher villages in Tojo Una-Una Regency and each village consists from 20 organoleptic test participants. Can be considered 60 organoleptic test participants. The results showed that there were more corn crackers than those who didn't. Organoleptic test of corn crackers that is produced is young corn crackers. Corn crackers on crispness parameters were stated to be the highest value of 48.16%, Color 39.3%, taste 36% and aroma 35%. Organoleptic test of the three villages which preferred corn crackers is Padang Tumbuo Village.
Solar cell adalah salah satu penghasil energi terbaharukan. Untuk memberikan energi yang stabil, sistem memerlukan sebuah accumulator. Untuk mengoptimalkan umur dan efisiensi accumulator, maka dibutuhkan metode pengisian accumulator yang baik. Tegangan keluaran solar cell berubah-ubah sesuai dengan kondisi lingkungan khusunya sinar matahari, maka dalam penelitian ini dirancang sebuah sistem DC to DC converter yang menggabungkan kerja full bridge dan boost converter yang mampu menaikkan dan menurunkan tegangan masukan agar menghasilkan tegangan yang stabil sesuai dengan kebutuhan tegangan pengisian accumulator 13.8 sampai dengan 14.7 Volt. Pada hasil pengujian dengan pemberian beban, tercatat bahwa efisiensi maksimal sebesar 86.7% pada pengujian dengan beban 4.6 ohm, efisiensi maksimal sebesar 87.6% pada pengujian dengan beban 7.1 ohm, efisiensi maksimal sebesar 95.3% pada pengujian dengan beban 14 ohm.
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