Judul: Design of an Automation System for Controlling Temperature, Water pH, Oxygen Levels and Water Change Volume in Catfish Breeding Ponds (Clarias sp.)
Abstrak: Pembibitan ikan lele diharuskan dapat melihat kebutuhan yang sesuai bagi larva ikan lele terutama pada kualitas air kolam. Tetapi pada pengaplikasianya, umumnya peyesuaian kebutuhan pada kualitas air hanya dilakukan tanpa ada perlakuan khusus, sehingga kelangsungan hidup yang didapat masih rendah. Tujuan dari penelitian ini adalah untuk membuat mesin yang dapat mengendalikan kualitas air pembibitan ikan lele, menguji kinerja mesin dan pengaruh penggunaanya. Penelitian ini menggunakan metode perumusan dan evaluasi desain dan menguji kinerja mesin yang terdiri dari beberapa tahapan, antara lain: perumusan dan evaluasi desain, pabrikasi mesin, uji fungsional, uji kinerja, dan pengaruh kinerja mesin. Hasil yang diperoleh setelah pengujian adalah kinerja mesin berpengaruh terhadap kecepatan penetasan telur, laju pertumbuhan dan kelangsungan hidup larva ikan lele. Kecepatan penetasan telur ikan lele lebih cepat 4 jam dengan menggunakan mesin. Laju pertumbahan menggunakan mesin sebesar 0,061g/ekor, sedangkan tanpa menggunakan mesin sebesar 0,053g/ekor. Kelangsungan hidup larva ikan menggunakan mesin sebesar 80,3%, sedangkan tanpa menggunakan mesin sebesar 63,1%. Kata kunci: kualitas air, kelangsungan hidup, larva ikan, pengendalian, pertumbuhan, Design of an Automation System for Controlling Temperature, Water pH, Oxygen Levels and Water Change Volume in Catfish Breeding Ponds (Clarias sp.). Supervised by DESRIAL. Catfish nurseries are required to be able to see the appropriate needs for catfish larvae, especially in pond water quality. However, in its application, generally adjustments to the needs of water quality are only carried out without any special treatment, so that the survival obtained is still low. The purpose of this research is to make a machine that can control the quality of catfish breeding water, test the performance of the machine and the effect of its use. This study used the method of formulating and evaluating the design and testing the performance of the machine which consisted of several stages, including: formulating and evaluating the design, manufacturing the machine, functional testing, performance testing, and the influence of the machine performance. The results obtained after testing were the performance of the machine affecting the speed of hatching eggs, the growth rate and survival of catfish larvae. The speed of hatching catfish eggs is 4 hours faster using a machine. The growth rate using a machine is 0.061g/head, while without using a machine it is 0.053g/head. The survival of fish larvae using machine was 80.3%, while without using machine was 63.1%.
Keyword: Rancang Bangun, Kualitas Air, Pembibitan Lele, Kontrol Otomatis, water quality, survival, fish larvae, control, growth

Judul: Design Fuzzy Logic Controller for Temperature Control on Catfish (Clarias gariepinus) Egg Incubation System
Abstrak: Karakteristik telur ikan yang sensitif terhadap perubahan parameter lingkungan terutama suhu dapat menyebabkan rendahnya daya tetas telur ikan, sehingga diperlukan teknologi kontrol agar dapat menjaga suhu media penetasan tetap berada pada rentang yang optimal. Di lain pihak juga berkembang suatu teknologi kontrol yang menerapkan pendekatan secara linguistik, sistem kontrol ini disebut dengan sistem kendali logika fuzzy. Penelitian ini bertujuan merancang kontrol logika fuzzy untuk kendali suhu sistem inkubasi telur ikan lele dumbo. Rancang bangun sistem kontrol terdiri atas tahapan perancangan perangkat keras dengan Arduino Mega 2560 sebagai sistem utama kontrol, kemudian dilanjutkan dengan perancangan perangkat lunak serta uji kinerja sistem kontrol. Pengujian dilakukan pada setpoint 30 ºC dengan nilai error steady state ±0,1% dan memperoleh daya tetas telur sebesar 63,33%. Pengujian juga dilakukan pada tingkat setpoint 28-31 ºC dengan nilai error steady state rata rata 0,1%. Fluktuasi suhu berkisar ±0,06 ºC., The characteristics of fish eggs that are sensitive to changes in environmental parameters, especially temperatur can cause low hatchability of fish eggs, so control technology is needed in order to keep the temperature of the hatching media in an optimal range. On the other hand, a control technology that applies a linguistic approach is also developed, this control system is called a fuzzy logic control system. This study aims to design a fuzzy logic control for temperature control of the catfish egg incubation system. The control system design consists of hardware design stages with an Arduino Mega 2560 as the main control system, followed by software design and control system performance testing. The test was carried out at a setpoint of 30 ºC with a steady state error value of ±0,1% and obtained an hatchinf rate of 63,33%. Tests were also carried out at the setpoint level of 28-31 ºC with an average steady state error value of 0,1%. Temperature fluctuations ranged ±0,06 ºC.
Keyword: catfish egg, fuzzy logic, incubator, temperature control

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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