Size-segregated particulate matter (PM) including the PM0.1 fraction, particles ≤0.1 µm, was monitored during the rainy and dry seasons at three different cities in Sumatra island, Indonesia in 2018. In order to identify possible emission sources, carbonaceous components in the particles collected by a cascade air sampler that is capable of collecting PM0.1 particles were analyzed by applying a thermal/optical reflectance (IMPROVE-TOR) protocol. The PM0.1 levels in the Jambi and Pekanbaru areas were similar to those in large cities in East Asia, such as Bangkok and Hanoi. During the rainy season, local emissions in the form of vehicle combustion were the main sources of PM. The influence of peatland fires in the dry season was more significant in cities that are located on the east coast of Sumatra island because of the larger number of hotspots and air mass trajectories along the coast. A clear increase in the carbonaceous profiles as OC, TC, and OC/EC ratios in the dry season from the rainy season was observed, particularly in fine fractions such as PM0.5–1. In both seasons, EC vs. OC/EC correlations and soot-EC/TC ratios showed that the PM0.1 fraction in Sumatra island was heavily influenced by vehicle emissions, while the effect of biomass burning was more sensitive with respect to the PM0.5–1 fraction, particularly in Jambi and Pekanbaru sites during the dry season.

Factors that need to be considered of producing good quality bread are raw materials, balance formulas (recipes) and production processes. The bread dough that cannot proof perfectly has become a problem in the process of bread production. Therefore, the temperature and humidity of the room must be controlled at a certain temperature range. The solution of this problem is proposing a controller that uses Fuzzy logic to control temperature and humidity in the bread examination room. A bread proofing machine is added a controller such as evaporator that it is can controlled the temperatur and humidity automatically. The heat and steam produced are regulated using a Fuzzy logic algorithm embedded in the microcontroller with a predetermined set point of temperature and humidity is 35 oC and 80%. The test is done by determining the percentage error from the temperature and humidity test results, that is when the machine is free of load obtained the percentage error to set points is 0,429 %  and 0,937 %. While the engine is loaded. It gives the results are 0,024 % and 0,015%. The results of this test prove that controlling temperature and humidity in a bread proofing machine using Fuzzy logic can provide good results compared to conventional controllers. as a result, the bread mixture can expand uniformly.

Universitas adalah salah satu kawasan yang termasuk dalam program Kementerian Pendidikan dan Kebudayaan mengenai pembelajaran tatap muka terbatas (PTM) selama pandemi Covid-19. Pada PTM memberlakukan hanya 50% kapasitas yang boleh memasuki ruangan. Pengunjung perpustakaan UIN Suska Riau hanya diperbolehkan masuk 100 sampai 150 secara rolling mengakibatkan antrean lama untuk memasuki perpustakaan. Perpustakaan merupakan tempat yang sering dikunjungi mahasiswa sebagai referensi tugas perkuliahan. Melalui penelitian ini, dapat membantu mahasiswa dalam berkunjung ke perpustakaan. Alat ini akan memberikan waktu berkunjung ke setiap pengunjung dan memberikan batas maksimal ruangan. Penelitian ini menggunakan website yang berguna sebagai database pengunjung. Sehingga membantu petugas perpustakaan dalam merekap data pengunjung. Penelitian ini menggunakan metode R&D. Hasil penelitian adalah alat ini mampu mengatasi waktu antrean berkunjung dan membantu petugas perpustakaan dalam merekap data pengunjung. PENDAHULUANUniversitas adalah salah satu kawasan yang termasuk dalam program Kementerian Pendidikan dan Kebudayaan mengenai pembelajaran tatap muka terbatas (PTM). Selama pandemi Covid-19, Universitas memberlakukan peraturan hanya 50% kapasitas yang dapat memasuki setiap gedung baik kelas maupun perkantoran (Neni, 2021). Universitas Negeri Sultan Syarif Kasim Riau (UIN Suska Riau) termasuk universitas menerapkan protokol kesehatan dan anjuran dalam pemakaian fasilitas. Salah satunya adalah perpustakaan, merupakan tempat yang sering dikunjungi oleh mahasiswa sebagai referensi tugas perkuliahan meskipun beberapa mata kuliah dilakukan secara daring. Menurut hasil wawancara, sebelum masa pandemi rata-rata pengunjung setiap bulannya mencapai 10.000 lebih pengunjung. Jumlah rata-rata pengunjung dinyatakan selalu meningkat dari tahun ke tahunnya. Setelah memasuki masa pandemi pada tahun 2019, perpustakaan UIN Tersedia Online di http://www.jurnal.unublitar.ac.id/index. php/briliant

<p>Pengendalian <em>L</em><em>evel</em> pada sistem <em>deaerator</em> penting untuk dijaga guna meminimalkan penyebab korosi pada sistem boiler. Pada PLTU Pertamina RU II Dumai, <em>deaerator</em> menggunakan kendali PI dengan nilai tetap  Kp 300, dan Ki 1,5, kendali PI masih memiliki <em>error</em> <em>steadystate</em> dan kendali PI masih mengalami <em>error</em> yang menyebabkan turunnya <em>level</em> <em>deaerator</em> dibawah 50% disebabkan gangguan <em>internal</em> dan <em>eksternal</em> serta <em>rise time</em> yang lama hingga 4 jam untuk mencapai keadaan <em>steady</em>, dalam wawancara pada PT Pertamina RU II Dumai normalnya hanya sebesar 30-60  menit. Dalam penelitian ini, dilakukan perancangan kendali MRAC-PD dengan metode <em>MIT</em> <em>Rule</em> untuk mengendalikan karakteristik <em>non</em> <em>linear</em> pada <em>level</em> <em>deaerator</em>, dan memperbaiki performansi <em>rise time</em>, <em>error</em> <em>steady</em> <em>state</em>, serta <em>settling</em> <em>time</em>.   dengan data yang diperoleh melalui PT. Pertamina RU II Dumai. Pemodelan deaerator  menggunakan persamaan pendekatan kesetimbangan massa.  Dengan koefisien gamma -50, Kp 0,04, dan Kd 50 yang didapatkan melalui metode <em>heuristic</em> mendapatkan hasil kendali MRAC-PD tanpa gangguan dengan <em>rise time</em> 33,39672 detik, <em>settling</em> <em>time</em> <em>kriteria</em> <em>error</em> 2% selama 53,1145893 detik, serta rentang <em>error</em> dari <em>setpoint</em> sebesar 0,000029428 meter, hal ini menunjukkan hasil yang baik dibandingkan  menggunakan kendali PI. Dalam uji gangguan, kendali MRAC-PD dapat kembali ke dalam keadaan <em>steady</em> lebih cepat di bandingkan kendali PI.</p><p><strong><em>Keywords</em></strong> - <em>Control</em><em>, Deaerator, Level, MRAC, PD</em></p>

In this paper, a new approach for supplying water to shrimp production ponds in Purworejo, Indonesia, is proposed. The paper covers the design of a solar-powered DC water pump system (SWPS), system performance analysis, and economic analysis by comparing it with the existing fossil-fuel-powered pumps. The mathematical approach for the designing process is shown and Lorents Compass alternative tool is introduced. By taking into consideration the daily water demand of 50 m3/day, the annual-averaged local solar irradiation of 4.7 kWh/m2 per day, and the available components in the market, an SWPS in Purworejo would comprise a 1200 Wp PV panel and a 600 W DC pump submerged in a borehole in the seashore. The SWPS would be able to meet the daily water demand with small seasonal variations. The financial analysis shows high feasibility to install SWPS in Purworejo with a 1,6 years simple payback period, which is very short. The SWPS would provide more than 20 years of free energy for the farmers to draw seawater to the pond each day when the sun shines. It can provide not only environmental and social benefits but also significant economic advantages, both at the farm and the national levels.