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PEMANFAATAN SERBUK TEMPURUNG KELAPA SEBAGAI ALTERNATIF SERAT PENGUAT BAHAN FRIKSI NON-ASBES PADA KAMPAS REM SEPEDA MOTOR Kiswiranti, D.; Sugianto, -; Hindarto, N.; Sutikno, -
Jurnal Pendidikan Fisika Indonesia Vol 5, No 1 (2009)
Publisher : Jurusan Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Semarang

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Serbuk tempurung kelapa dapat dimanfaatkan sebagai serat penguat bahan friksi non-asbes. Dalam penelitian ini, komposisi 20%dan 30% serbuk tempurung kelapa ditemukan yang paling optimum untuk parameter kekerasan dan keausan. Bahan friksi dengankomposisi 20% memiliki kekerasan sebesar 77,5 kgf.mm-2 dan keausan sebesar 28,25 mm2/kg. Bahan friksi dengan komposisi30% serbuk tempurung kelapa mempunyai kekerasan sebesar 58,8 kgf.mm-2 dan keausan sebesar 34 mm2/kg. Untuk dapatdiaplikasikan pada sepeda motor, desain sampel disesuaikan dengan spesifikasi kampas rem sepeda motor.ÃÂ Coconut char powder can be used as reinforcement fibers of non asbestos brake frikcion materials.In this research, the contents ofcoconut char powder of 20 % and 30 % show optimum hardnes and wear resistances. The brake frikcion material with 20 % coconutchar powder is found hardnes as well as 77,5 kgf.mm-2 and the wear resistance is 28,25 kgf.mm-2/kg. The brake frikcion materialwith the coconut char powder 30% volume has hardnes of 58,8 kgf.mm-2/kg and the wear resistance of 34 mm2/kg. To be applied inthe fabrication of motorcycle spare spart, the sample design is necessary adapted with motorcycle brake.Keywords: frictim material; motorcycle brake; fiber material; coconut char powder

VARIASI KOMPOSISI DINDING CANGKANG FOSIL FORAMINIFERA BENTONIK UNTUK PENENTUAN LINGKUNGAN PENGENDAPAN DAERAH SUNGAI OYO, DESA BEJI, KECAMATAN PATUK, KABUPATEN GUNUNGKIDUL, DAERAH ISTIMEWA YOGYAKARTA Tania, Dina; Kiswiranti, Desi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 13 No 2 Februari 2021
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

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The Oyo River, which stretches relatively northwest - southeast in Beji Village, has seven rock facies that make up the Sambipitu Foundation with marl lithology, then the Oyo Formation is deposited on it with claystone lithology, breccia, tuff and sandstones, and the Wonosari Formation with calcirudite lithology and calcarenite based on stratigraphic measurements as thick as 165 meters with dips ranging from 5o-15o. The variation in the composition of the bentonic foraminifera shell wall in the Oyo River rocks reflects environmental changes from normal marine lagoon and carbonate platforms to a continental slope and sea shelf when referring to the triangular plot of Murray (1991) and Brasier (1980) based on the type of shell composition Loeblich and Tappan (1988). The existence of sedimentary structures also shows a transition from a lower fan in the Sambipitu Formation to a suprafan lobes on the mid fan in the Oyo Formation based on the underwater fan model Walker (1978) and ending up as an inner ramp according to Buchette and Wright (1992) by Tania (2019). This is in line with the depositional environment by Tipsword et.al. (1966) and the foraminifera group by Bignot (1982) which shows that the Sambitu Formation is dominated by porcelaneous in the middle bathyal, then the Oyo Formation is dominated by agglutine in the upper bathyal and the Wonosari Formation on the outer-inner neritic is dominated by porcelaneous.middle bathyal, then the Oyo Formation is dominated by agglutine in the upper bathyal and the Wonosari Formation on the outer - inner neritic is dominated by porcelaneous.

VARIASI KOMPOSISI DINDING CANGKANG FOSIL FORAMINIFERA BENTONIK UNTUK PENENTUAN LINGKUNGAN PENGENDAPAN DAERAH SUNGAI OYO, DESA BEJI, KECAMATAN PATUK, KABUPATEN GUNUNGKIDUL, DAERAH ISTIMEWA YOGYAKARTA Tania, Dina; Kiswiranti, Desi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 13 No 2 Februari 2021
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

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The Oyo River, which stretches relatively northwest - southeast in Beji Village, has seven rock facies that make up the Sambipitu Foundation with marl lithology, then the Oyo Formation is deposited on it with claystone lithology, breccia, tuff and sandstones, and the Wonosari Formation with calcirudite lithology and calcarenite based on stratigraphic measurements as thick as 165 meters with dips ranging from 5o-15o. The variation in the composition of the bentonic foraminifera shell wall in the Oyo River rocks reflects environmental changes from normal marine lagoon and carbonate platforms to a continental slope and sea shelf when referring to the triangular plot of Murray (1991) and Brasier (1980) based on the type of shell composition Loeblich and Tappan (1988). The existence of sedimentary structures also shows a transition from a lower fan in the Sambipitu Formation to a suprafan lobes on the mid fan in the Oyo Formation based on the underwater fan model Walker (1978) and ending up as an inner ramp according to Buchette and Wright (1992) by Tania (2019). This is in line with the depositional environment by Tipsword et.al. (1966) and the foraminifera group by Bignot (1982) which shows that the Sambitu Formation is dominated by porcelaneous in the middle bathyal, then the Oyo Formation is dominated by agglutine in the upper bathyal and the Wonosari Formation on the outer-inner neritic is dominated by porcelaneous.middle bathyal, then the Oyo Formation is dominated by agglutine in the upper bathyal and the Wonosari Formation on the outer - inner neritic is dominated by porcelaneous.

Volcanism in The Pre-Semilir Formation at Giriloyo Region; Allegedly as Source of Kebo-Butak Formation in the Western Southern Mountains Sri Mulyaningsih; Muchlis Muchlis; Nur W.A.A.T. Heriyadi; Desi Kiswiranti
Journal of Geoscience, Engineering, Environment, and Technology Vol. 4 No. 3 (2019): JGEET Vol 04 No 03 : September (2019)
Publisher : UIR PRESS

Kebo-Butak Formation was known to be the oldest volcanic rocks limited in regional terms in the lower Baturagung Hills, Gedangsari area, Gunungkidul Regency. The main constituents of the Kebo-Butak Formation consist of intersection of volcanic-clastic rocks and calcareous sediments, locally also found basalt lava with pillow structures; which distinguished it from other volcanic rock formations in the Southern Mountains. This study aims to determine the relationship of volcanic rocks exposed in Giriloyo with the Kebo-Butak Formation in the Baturagung Hills; the chronostratigraphy and the history of volcanic activities that produced the volcanic rocks of Giriloyo. This research was approached by volcanic geological mapping using surface mapping suported by gravity anayses. From the bottom to the top of the frontier areas result volcaniclastic rocks consisting of black tuffs with several fragments of volcanic bombs with basalt composition intersecting with thin basaltic lava inserted by calcareous claystone having an age of N5-7 (Early Miocene); pyroxene-rich basalt volcanic sequence consists of thick layers of tuff with creamy-brown color intersecting with lava and breccia inserted by calcareous sandstone aged N7-8; dikes, lava and agglomerates with basaltic composition and lava and agglomerates with andesitic composition. Stratigraphically, the volcanic rocks exposed at Giriloyo correlated with the volcanic rocks exposed at Karangtalun (Wukirsari) were under the Semilir Formation, bordered with normal fault N210oE/77o, the hanging wall composed by light grey tuff of Semilir Formation. Gravity analyses found high anomalies below the Semilir Formation exposed at Karangtalun-Munthuk (east of study area) continued to below the Giriloyo area. The high anomalies were identified as the igneous/ignimbrite volcanic sequence. Descriptively and stratigraphically, the Giriloyo volcanic sequence are a part of Kebo-Butak Formation. The petrogenesis of the volcanic rocks will be discussed in further research to interpret magmatological properties, the evolving paleo-volcano, and the absolute age of the rocks.

Karakteristik Hidrokimia Akibat Pengaruh Formasi Batuan pada Mata Air Panas Di Desa Wukirharjo, Kecamatan Parengan, Kabupaten Tuban, Jawa Timur Sepridawati Siregar; Desi Kiswiranti; M. Jamaluddin
Piston: Journal of Technical Engineering Vol 1, No 2 (2018)
Publisher : Prodi Teknik Mesin

Penelitian dilakukan di desa Wukirharjo, Kecamatan Parengan, Kabupaten Tuban, Jawa Timur tentang pengaruh formasi batuan terhadap karakteristik hidrokimia sumber mata air panas dengan suhu mencapai 500°C di Wana Wisata Prataan. Penelitian ini bertujuan untuk menentukan parameter fisika dan kimia yang terdapat pada sumber mata air panas dan selanjutnya dianalisis hubungan kandungan logam yang dimiliki sumber mata air panas terhadap formasi batuan di daerah Kecamatan Parengan. Pengujian bau dan rasa langsung dilakukan di lokasi penelitian dengan sedikit berbau sulfur dan tidak berasa, sedangkan nilai pH adalah 6,5yang termasuk pada kategori asam. Kandungan sulfur pada mataair panas ini cukup tinggi yaitu 153 mg/L dan nilai kesadahan 65,8mg/L tetapi masih dibawah baku mutu air bersih yang ditetapkan. Sumber mata air panas yang tersingkap di daerah Wukirharjo tersusun atas batugamping dan batupasir kuarsa yang termasuk dalam zona rembang. Dimana zona ini merupakan formasi ngrayong yang terbentuk karena adanya silika yang didominasi oleh logam Fe dengan konsentrasi 10,554 mg/L dan Al dengan konsentrasi 4,552 mg/L. Sumber mata air panas ini memiliki TDS rendah dengan nilai 8,3mg/L dan digolongkan sebagai air lunak (soft water), sehingga masih layak sebagai air pemandian.

PEMANFAATAN SAMPAH ORGANIK DAN AN-ORGANIK DI DESA SEDAYU KECAMATAN MUNTILAN Nurul Dzakiya; Desi Kiswiranti; Radhitya Adzan Hidayah; Muchlis Muchlis
DHARMA BAKTI Dharma Bakti-Vol 2 No 2-Oktober 2019
Publisher : LPPM IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/dharma.v2i2.2423

Banaran Village, Magelang District, is one of the villages producing stone crafts thathave high selling power such as mortar, pots and statues. However, waste rock fragmentsare a lot of problems for residents. In other hand, organic and non-organic waste that isaround the residents environment is also another problem that needs to be sought asolution. So that people need to be given insights about other functions of the rubbish,namely by utilizing it into stone temple crafts, planting media, organic fertilizer and fuel.The method of implementation is carried out with socialization to the community andtraining. As a result of this dedication, the residents of Sedayu are able to make wasteproducts into other products in accordance with the waste that is owned around theirrespective neighborhoods

Estimasi Magnitudo Paleoearthquake Dengan Metode Magnitude Bound Desi Kiswiranti
Jurnal Fisika Indonesia Vol 20, No 2 (2016)
Publisher : Department of Physics Universitas Gadjah Mada

Yogyakarta was recorded unique seismic on the temple buildings such as Kedulan, Plaosan, Gampingan, Morangan and Kadisoka deformed on the body of the building due to liquefaction. Liquefaction structure found on the site of sand pillar, sand fissure and sand sill consisting of sand material that intrution other sediment layer. Magnitude Bound method is used to estimate the paleoearthquake magnitudes from paleoliquefaction data by utilizing the farthest distance liquefaction formed with epicenter earthquake. The application of the method shows that Yogyakarta had a large earthquake with magnitude of 6.25-6.5 M. The earthquake can cause severe physical damage, and can lead to secondary disasters such as liquefaction.

ANALISIS STATISTIK TEMPORAL ERUPSI GUNUNG MERAPI Desi Kiswiranti; H Kirbani
Jurnal Fisika Vol 3, No 1 (2013)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jf.v3i1.3964

Merapi adalah gunungapi termuda di selatan Pulau Jawa. Merapi terletak di 7o32'30"LS dan 110o26'30" BT. Gunung Merapi merupakan gunung api strato yang aktif sampai hari ini. Aktivitas gunung Merapi dimulai pada zaman Pleistosen (1,5 juta tahun yang lalu). Gunung Merapi ini memiliki potensi untuk menimbulkan bencana alam dengan intensitas dan kekuatan yang berbeda. Aktivitas vulkanik adalah kejadian alam yang sulit diprediksi dan dapat dianggap sebagai chaotic tanpa bentuk yang jelas. Metode statistik dapat diterapkan untuk menjelaskan pola letusan gunungapi serta membantu ramalan aktifitas letusan gunungapi di masa depan. Dalam penelitian ini, digunakan tiga metode statistik temporal yaitu distribusi eksponensial, distribusi Weibull dan distribusi Log-Logistik. Secara umum, distribusi Log-Logistik memberikan probabilitas tertinggi letusan yang terjadi dalam waktu tertentu di masa depan dengan tingkat kepercayaan 95%. Pada tahun 2013, probabilitas gunung Merapi untuk meletus sebesar 64,04%. Secara kualitatif, letusan terbesar akan mengikuti interval waktu istirahat terpanjang. Besarnya waktu istirahat tidak berpengaruh pada besarnya VEI serta tidak berpengaruh terhadap kemungkinan terjadinya letusan. Ratarata energi potensial pada erupsi gunung Merapi periode 1800-2012 sebesar 9,99039 x1020 ergs dan rata-rata energi termal periode 1800-2012 sebesar 4,31282 x 1022 ergs. Oleh karena itu, energi total letusan gunung Merapi sebesar 4,41272 x 1022 ergs.

Karakteristik Hidrokimia Akibat Pengaruh Formasi Batuan pada Mata Air Panas Di Desa Wukirharjo, Kecamatan Parengan, Kabupaten Tuban, Jawa Timur Sepridawati Siregar; Desi Kiswiranti; M. Jamaluddin
Piston: Journal of Technical Engineering Vol 1, No 2 (2018)
Publisher : Prodi Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32493/pjte.v1i2.3192

Penelitian dilakukan di desa Wukirharjo, Kecamatan Parengan, Kabupaten Tuban, Jawa Timur tentang pengaruh formasi batuan terhadap karakteristik hidrokimia sumber mata air panas dengan suhu mencapai 500°C di Wana Wisata Prataan. Penelitian ini bertujuan untuk menentukan parameter fisika dan kimia yang terdapat pada sumber mata air panas dan selanjutnya dianalisis hubungan kandungan logam yang dimiliki sumber mata air panas terhadap formasi batuan di daerah Kecamatan Parengan. Pengujian bau dan rasa langsung dilakukan di lokasi penelitian dengan sedikit berbau sulfur dan tidak berasa, sedangkan nilai pH adalah 6,5yang termasuk pada kategori asam. Kandungan sulfur pada mataair panas ini cukup tinggi yaitu 153 mg/L dan nilai kesadahan 65,8mg/L tetapi masih dibawah baku mutu air bersih yang ditetapkan. Sumber mata air panas yang tersingkap di daerah Wukirharjo tersusun atas batugamping dan batupasir kuarsa yang termasuk dalam zona rembang. Dimana zona ini merupakan formasi ngrayong yang terbentuk karena adanya silika yang didominasi oleh logam Fe dengan konsentrasi 10,554 mg/L dan Al dengan konsentrasi 4,552 mg/L. Sumber mata air panas ini memiliki TDS rendah dengan nilai 8,3mg/L dan digolongkan sebagai air lunak (soft water), sehingga masih layak sebagai air pemandian.

Delineating of Groundwater Aquifer Potential Using Vertical Electrical Sounding (VES) Methods in Giriloyo, Wukirsari Village, Imogiri District, Bantul Regency, Special Region of Yogyakarta Kiswiranti, Desi; Tania, Dina; Dzakiya, Nurul; Hanani, Prita
Journal of Applied Geospatial Information Vol 7 No 2 (2023): Journal of Applied Geospatial Information (JAGI)
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jagi.v7i2.6711

The geophysical investigation in Giriloyo, Wukirsari Village, has defined the groundwater potential zones. The research region underwent a geophysical examination utilizing the electrical resistance method, which comprised the vertical electrical sounding (VES) technique and the Schlumberger array system. The study area is surrounded by common rock types such as lava, tuff, agglomerate, and alluvial. In the study region, five lines were explored. Data for subsurface resistivity were gathered with an Oyo McOhm type 2115. IPI2win, a piece of computer software that analyzes data and automatically interprets apparent resistivity, was used to examine the data. The VES data showed the varied nature of the subsurface geological sequence. The geoelectrical cross-sections along the profile of (VES 2-3-4-1) show an aquifer, which stretches from the southeast towards the northwest part of the basin. Tuff is seen to have formed shallow aquifers due to the top weathered part at VES-2 and 3, while Quartz chlorite calcite (VES-4) and Plagioclases (VES-1) are devoid of shallow aquifers. The higher-elevation lithological areas recharge the low-elevation aquifer zones. At VES 2 and 3, relatively low resistivity values (< about 100 Ωm) have been observed. A field observation at these locations reveals that these lithologies are highly fractured with a weathering profile of up to 10 m. Thus, these are the sites where groundwater potential zones can be marked (figure 4). The high resistivity (about 3162 Ωm regions is observed extending at the VES-4; this may be due to the least weathered Quartz chlorite calcite at high elevation. VES-1 is also located on the plagioclase and shows a slight resistivity zone, which could be considered a groundwater recharge zone. This profile shows the high possibility of groundwater potential due to the zone of lineaments.

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