SIMETRIS https://www.jurnal.sttrcepu.ac.id/index.php/simetris <p>SIMETRIS: Jurnal Teknologi dan Sains Terapan merupakan jurnal ilmiah yang diterbitkan secara berkala tiap enam bulan, yaitu Juni dan Desember. SIMETRIS: Jurnal Teknologi dan Sains Terapan Menerima artikel dari berbagai kalangan yang isinya meliputi kajian dan aplikasi teori, hasil penelitian, gagasan konseptual yang menarik dalam bidang teknik dan sains terapan. Tim redaksi akan memutuskan pemilihan artikel yang akan diterbitkan setelah menerima hasil penilaian dari tim penyunting ahli. Penulis akan diberi masukan dari tim penyunting ahli.&nbsp; SIMETRIS: Jurnal Teknologi dan Sains Terapan berisi artikel hasil penelitian atau studi kepustakaan dalam bahasa Indonesia dan bahasa Inggris.</p> <p>&nbsp;</p> en-US simetris@gmail.com (Arya Dwi Candra) Helmi@sttrcepu.ac.id (Helmi Gunawan) Mon, 31 Dec 2018 00:00:00 +0000 OJS 3.1.0.1 http://blogs.law.harvard.edu/tech/rss 60 INSTALASI UNIT BIOGAS DARI LIMBAH KOTORAN SAPI DENGAN METODE ANAEROB MENGGUNAKAN REAKTOR VOLUME 3300 L https://www.jurnal.sttrcepu.ac.id/index.php/simetris/article/view/45 <p>Medalem is one of the villages located in Kradenan District, Blora Regency,<br>Central Java. Most of the residents of Kradenan have a livelihood as Farmers, including<br>residents of Medalem Village. In addition to farming, residents also conduct cattle and goat<br>breeding activities, this is due to very supportive natural conditions. Medalem Village,<br>especially Sunggun Hamlet, gets a grant in the form of cattle from the local government to<br>be managed by each farmer group in Sunggun Hamlet. Until now the number of cows<br>managed by farmer groups has reached 28. Several cows maintained in one places or in<br>residents in their own homes. There are some disadvantage caused by the amount of cow<br>dung produced by these cows, ranging from unpleasant odors, trees and plants that die<br>from piles of cow dung, to the dwindling landfill of cow dung. This research aims to<br>provide appropriate solutions to overcome these problems. The activities carried out are by<br>building the installation of biogas units in Sunggun Hamlet. This biogas processing<br>technique uses a cylinder reactor (floating drum). Some of the results of the activities that<br>have been carried out are more integrated processing of cow manure, no land wasted to<br>accumulate cow dung, improved soil and air health quality, availability of new LPG<br>replacement fuel, availability of organic fertilizer that can be directly applied to crops,<br>availability of waste solid that can be used as a planting medium.</p> puput eka suryani, suluh jatmiko, arya dwi candra ##submission.copyrightStatement## simetris https://www.jurnal.sttrcepu.ac.id/index.php/simetris/article/view/45 Mon, 31 Dec 2018 00:00:00 +0000 Analisis Peningkatan Mutu Agregat Halus Pasir Demak sebagai Bahan Campuran Beton Normal K250 https://www.jurnal.sttrcepu.ac.id/index.php/simetris/article/view/46 <p>Fine aggregate (natural sand) commonly contains a lot of mud and is fine and round shaped which is generated from a friction process making&nbsp; the stickiness of the granules of which is inadequate. In order to gain a good material,&nbsp; washing is required or we have to mix several kinds of aggregate so as to obtain the desired result. The objectives of this study&nbsp; are finding out the the quality of Demak’s fine aggregate, the quality of the concrete produced, the method of enhancing the quality of the Demak’s fine aggregate, the quality of the concrete that uses the enhanced fine aggregate, the comparison between the quality of the fine aggregate prior to and post quality , enhancement and the quality comparison of the produced concrete. Demak’s fine aggregate has a 8.18 % mud content, a 43.53 % water absorbency and fineness modulus ( granule fine modulus) of 2.44. The concrete that uses the Demak’s fine aggregate has the average pressure strength of 94.61 kg/cm<sup>2</sup>, modulus of rupture of 10,96 kg/cm<sup>2</sup> , and splitting test of 30.66 kg/cm<sup>2</sup>. The Demak’s fine aggregate after being washed has a mud content of 7.46 %, water content and water absorbency of 15.38 % and FM of 2.67.&nbsp; The concrete that uses washed Demak’s fine aggregate has the average pressure strength of 102.06 kg/cm<sup>2</sup>, modulus of rupture of 12,02 kg/cm<sup>2</sup>, and splitting test of 33.33 kg/cm<sup>2</sup>. The fine aggregate of mixture of 50 % washed Demak’s fine aggregate and 50 % &nbsp;stone dust has the mud content of 6.25 %, water content and water absorbency of 8.24 % and FM of 3.24. The concrete that uses the mixture of 50 % washed Demak’s fine aggregate and 50 % &nbsp;stone dust has the average pressure strength of 138 kg/cm<sup>2</sup>, modulus of rupture of 16.98 kg/cm<sup>2</sup>, and splitting test of 44.88 kg/cm<sup>2</sup>. The highest quality enhancement of concrete for average pressure strength converted into the age of 28 days is 45.88 % on the concrete with the material of which is a mixture of 50 % washed Demak’s fine aggregate and 50% &nbsp;stone dust against the concrete with material of which is Demak’s fine aggregate.</p> <p><strong><em>&nbsp;</em></strong></p> Dwi Agus Rudyanto, Masrur Masrur ##submission.copyrightStatement## https://www.jurnal.sttrcepu.ac.id/index.php/simetris/article/view/46 Mon, 31 Dec 2018 00:00:00 +0000 Rancang Bangun Data Logger Temperatur https://www.jurnal.sttrcepu.ac.id/index.php/simetris/article/view/47 <p>Temperature data logger is a portable measurement instrument used for reading the temperature of an object and storing the results of temperature in the form of data. Temperature data logger consists of NTC 7.5 K probe thermocouple with serial number SSR038 (16 pieces), the arduino mega microcontroller atmega 2560, and the card data logger module&nbsp; SC-MMC with serial number MOD009. The software used is Arduino 1.5.7 windows based. Testing of 16 thermocouples is done by dipping the thermocouple in water with an initial temperature of about 27<sup>o</sup>C, then the water is heated slowly for 650 seconds. The results show the same chart pattern, even though there is a slight difference in value.&nbsp; Maximum deviation is 1.0<sup>o</sup>C.&nbsp; The temperature which is displayed on the monitor screen and stored on the SD card is the same.</p> Agus Dwi Korawan ##submission.copyrightStatement## https://www.jurnal.sttrcepu.ac.id/index.php/simetris/article/view/47 Mon, 31 Dec 2018 00:00:00 +0000