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SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi
Published by Universitas Sarjanawiyata Tamansiswa
ISSN : 24606286     EISSN : 25793624     DOI : 10.30738/science tech.v2i1.396
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Engineering Materials Science & Nanotechnology
Jurnal SCIENCE TECH adalah jurnal yang diterbitkan oleh Lembaga Penelitian dan Pengabdian kepada Masyarakat (LP2M) Universitas Sarjanawiyata Tamansiswa (UST) Yogyakarta. Jurnal ini diharapkan sebagai media bagi dosen, peneliti, praktisi, mahasiswa dan masyarakat luas yang memiliki perhatian terhadap bidang dan perkembangan ilnu pengetahuan dan teknologi. Jurnal SCIENCE TECH terbit dua kali setahun yaitu Januari dan Agustus, setiap terbit 8 artikel.
Arjuna Subject : Umum - Umum
Articles 7 Documents
 1 
Search results for , issue "Vol 1 No 1 (2015): Februari" : 7 Documents clear
STUDI DRAG FORCE GELOMBANG AIR LAUT TERHADAP FONDASI TIANG MINI (MINIPILE) DI KAWASAN PANTAI PARANGTRITIS Zainul Faizien Haza
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 1 No 1 (2015): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (532.836 KB) | DOI: 10.30738/jst.v1i1.472

Abstract

Lateral load factor is an important parameter in the calculation of the load capacity of pile foundation, especially in desian pile foundation in coastal areas where the impact of the waves act as additional lateral load that significantly affect to lateral stability of pile foundation, in this case a mini slab foundations (minipile). The interaction between the waves with a pile foundation is a transfer force event, where the force transmitted by waves more as a drag force than impact force. This is because the wave is a fluid material instead of solid material. This study was conducted to determine the magnitude of the drag force due to the waves of the sea water on cylindrical concrete slab foundations mini (minipile). The simulation results show that the use of large diameter pile exacerbated the drag force coefficient of drag force exerted at the same time by the sea water to the surface of minipile
RANCANG BANGUN LASER UNTUK PEMBELAJARAN OPTIKA DALAM MENENTUKAN INDEKS BIAS DAN DIFRAKSI KISI Puji Hariati Winingsih
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 1 No 1 (2015): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (701.889 KB) | DOI: 10.30738/jst.v1i1.482

Abstract

This research is executed as a mean to make laser with energy  from ex- materials ( DVD) to be used to determine refractive index and  difraction. For that, have been made laser diode appliance network used to determine  \Kprism refractive index and laser wavelength [pass/through] difraction. This research is used by analysis with refractive index characteristic and difraction. Obtained result of that level of prism refractive index at variation of  i1  (30o, 45o dan 60o) equal to (1.53 ± 0.07), (1.45 ± 0.08) and ( 1.53 ± 0.08). Green Laser wavelength at variation of N (100, 300 and 600 line / mm)successively equal to (500 ± 0.03),   (525 ± 0.02) and (541 ± 0.07). Pursuant to prism refractive index theory of[is level of 1.5 and green colour laser wavelength range from (500 – 570) nm. So that can be concluded that result of research have as according to this appliance and theory have  earned to be told good to used in study of optics
PENANGANAN LIMBAH GERGAJIAN BATU ALAM PASCA ERUPSI MERAPI Aji Pranoto; Saiful Huda
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 1 No 1 (2015): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (679.768 KB) | DOI: 10.30738/jst.v1i1.474

Abstract

Stone sawing process in the area of Sleman leaves stone powder as waste, which discharged directly onto the ground can result into a barren land can not be planted and will also lead to ground can not absorb rainwater where this can lead to severe environmental damage, such as floods and droughts.To overcome this problem, the program is made of natural stone sawmill waste utilization through science and technology to the Community (IbM), with a program of making handicrafts using the main raw material waste sawdust and splinters of natural stone. The program is implemented with the main objective to empower people to be able to cope with waste and create new jobs. The resulting product consists ofCrafts (handcraft),Flower Pot and Mosaic The first is the handcraft produced with the main ingredient as the matrix is resin apoxy 95%, hardener 3%, plus 2% cobalt, as inforcement used stone dust particle with variable best comparison is 50% matrix, and 50% particle inforcment. whereas the mold to make handcraft materials using RTV silicone rubber 586 plus hardener. Both produced flowerpot with the main ingredient of cement and sawdust stone cast coupled with hardener (hardener), where the best compositions based on test results is 15% cement an d 75% stone dust. The molds used are made of Fiber Glass and steel molds. The resulting third is a mosaic, made of stone flakes aggregate prepared using cement and wire mesh material as  a binder and stone chips as forming ornaments. The mold using steel plate rectangular with size (20 x 20) cm. Of the three products produced, which has the best economic value is the Flower Pot, followed handcraft, while the mosaic has the lowest economic value
DE-ALGEBRAS, E-LOGIC DAN E-SET THEORY Denik Agustito
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 1 No 1 (2015): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (749.759 KB) | DOI: 10.30738/jst.v1i1.475

Abstract

Dalam logika biasa, disjungsi yang digunakan dalam beberapa pernyataan matematika menggunakan disjungsi inklusif dan ini mendapatkan sebuah struktur aljabar baru yang terdiri dari himpunan semua pernyataan bersama dengan konjungsi, disjungsi inklusif, negasi, tautologi dan kontradiksi yang akan dinamakan dengan aljabar boolean. Didalam logika biasa juga ada sebuah gagasan disjungsi yang lain yaitu disjungsi eksklusif. Paper ini akan menjelaskan tentang struktur aljabar baru yang dikonstruksi jika disjungsi inklusifnya diganti dengan disjungsi eksklusif dan apa akibatnya bagi logika dan teori himpunan jika dibangun berdasarkan struktur aljabar yang baru tadi
KUAT LENTUR PANEL PARTISI DARI LIMBAH STYROFOAM YANG DILAPISI KAWAT LOKET Dewi Sulistyorini
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 1 No 1 (2015): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (656.304 KB) | DOI: 10.30738/jst.v1i1.470

Abstract

The room is one element in a building. So, we need a wall or divider as a separator between the room. Partition wall was designed as a temporary partition wall and without the loaded. Building materials  must have some advantages such as light weight, durability, shape can suit the needs, the speed of the construction, low cost and environmental friendly. Such materials like Styrofoam or expanded polysterene (EPS), which is an insulator lightweight material, rigid and made from plastic materials. Partition panel research of styrofoam waste coated wiremesh  is an attempt to determine the potential use of styrofoam waste  as a partition panel that reviewed material from the unit weight and flexural strength. Test specimen for 3 (three) pieces of panels with dimension 80 cm long, 30 cm wide, 1 cm thick, with compression 2 MPa and water-cement factor 0.45. The weight of used cement 250 kg / m3, wiremesh diameter of 0.6 mm with grid 6 mm x 6 mm. The test results obtained average unit weight for panel was 1081.9 kg / m3 and average flexural strength of 0.721 MPa. The pattern of the damage indicated by the curved wiremesh prior to the loading position, and then styrofoam concrete cracks
PENINGKATAN PERFORMA SEPEDA MOTOR DENGAN VARIASI CDI PROGRAMMABLE THE IMPROVEMENT OF MOTORCYCLES PERFORMANCE USING CDI PROGRAMMABLE Ibnu Siswanto; Yosep Efendi
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 1 No 1 (2015): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (540.926 KB) | DOI: 10.30738/jst.v1i1.478

Abstract

The study aims to determine the engine performance characteristics of motorcycle that use CDI genuine and CDI programmable, and differences in performance characteristics of motorcycle engine that uses the CDI genuine and CDI  programmable. The study method used was experimental. The object of study was motorcycle 1 cylinder 125 cc. The equipment used to perform power measurement was dynotest motorcycle vehicle. Experiments conducted with the motorcycle still conditions in accordance with standard factory (no modification). The results showed that (1) Motorcycles with CDI Genuine produces the highest power 8HP obtained at 6542 RPM and the highest was 10.12 NM torque at 5085. While the RPM after it was replaced with CDI Programmable, peak power of 8.2 at 6556 RPM and torque of 10.33 in 4670. (2) There  was a difference in engine performance using CDI genuine and CDI Programmable. The highest power achieved in almost all variations of CDI Programmable, amounting 8,2HP. The highest torque was obtained by advancing the CDI Programmable Timing 2 degrees, it  10,33Nm at 4670 RPM
PENGARUH DURASI SERANGAN GELOMBANG TERHADAP TINGKAT KERUSAKAN LAPIS LINDUNG PEMECAH GELOMBANG Ida Bagus Agung
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 1 No 1 (2015): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (469.765 KB) | DOI: 10.30738/jst.v1i1.471

Abstract

this research tetrapod  have been utilized for breakwater  cover layer or armour layer. The effect of wave duration on the armor  layer tetrapod stability was  studied. The models were run  in the irregular wave flume, where Bretschneider spectrum may be generated attacking  the breakwater. The waves were set to break before reaching the breakwater. The test was conducted until the damage level of armour layer reached more than 5 %. The result of the research showed that waves duration and the high  of the wave attack affect the stability of armour layer, especially when the wave  was Rayleigh distributed. The effect of waves duration  reduced  as more and more waves broken before reaching the structure of the breakwater

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