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SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi

sciencetech
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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 107 Documents

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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

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

PENGUKURAN NILAI INTANGIBLE PADA PROJECT BASED ORGANIZATION V. Reza Bayu Kurniawan
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 2 No 1 (2016): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Intangible factor is a very important factor. The importance of measuring the value of intangible has become a challenge for a company nowadays, not only for functional companies (functional-based organization) but also for project companies (project-based organization). This research aimed to identify intangible factors and measure the value of intangible in organizations which are in the form of project. The value of measured intangible can be used to predict the potential gained value of a project conducted by a company. The object of this research is a project-based company running business on repair and maintenance service (after sale service), logistic, and general contractor (general construction). The identification process of intangible was done by using Analytic Hierarchy Process (AHP) method.Â Then, a prediction model for determining the project value was made by considering its intangible factor. This model was made using multiple-regression analysis. Intangible factors that have been identified are technology, human knowledge, management capability, networking, and financial support. The intangible values of each intangible factor and their qualities respectively are: management capability is 0.444, networking is 0.262, financial support is 0.152, human knowledge is 0.089, and technology is 0.052. From the measured intangible, it can be seen that the value of mean square error (MSE) is 0.0065. It shows that this prediction model can be used to predict a project value by considering its intangible factor

STUDI EFEK MEMORI HIDROKSIDA GANDA TERLAPIS Zn-Al-NO3 Tias Ernawati; Roto Roto
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 2 No 2 (2016): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Synthesis and memory effectâ€™s study of Zn-Al Layered Double Hydroxides (LDH) containing nitrite anion had been performed. Zn-Al-NO3 LDH were synthesized by coprecipitating and hydrothermal methods with molar ratio of Zn:Al of 3:1. The conversion of Zn-Al-NO3 LDH to corresponding mixed metal oxide were carried out by heating Zn-Al-NO3 LDH at 400Âº C for 2 hours. The reconstruction of Zn-Al-NO3 LDH were carried out by reacting the mixed metal oxide with solution of sodium nitrate 0,01 mol.Zn0.702Al0.298(OH)2(NO3)0.298.1.882H2O were synthesized. Its mixed metal oxide were made. The results of XRD and FTIR analyses showed that Zn-Al-NO3 LDH could be reconstructed after calcination. This work may enable to recycle and reuse of LDHs after the structure damaged.

PENGEMBANGAN BAHAN AJAR MATEMATIKA SMA BERBASIS GEOGEBRA VERSI ANDROID Hedi Budiman; Sendi Ramdhani
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 3 No 2 (2017): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Geogebra versi android merupakan inovasi perangkat lunak matematika yang dapat digunakan oleh guru atau siswa dalam proses pembelajaran. Penelitian ini bertujuan untuk mengembangkan bahan ajar matematika SMA pada fungsi kuadrat grafik, persamaan sumbu simetri, dan titik puncak berbasis geogebra versi android. Dalam proses pembelajaran, guru menjelaskan dan mengkonstruksi pengetahuan siswa tentang beberapa konsep materi dan mendorong siswa untuk membangun pengetahuannya sendiri. Siswa menggunakan geogebra versi android untuk membuat dugaan dan menemukan beberapa konsep fungsi kuadrat grafik pada lembar aktivitas siswa. Metode yang digumnakan adalah penelitian pengembangan atau development research tipe formative research. Adapun yang dikembangkan adalah perangkat pembelajaran berupa bahan bahan ajar matematika interaktif berbasis aplikasi Geogebra versi Android. Penelitian ini dilaksanakan pada semester ganjil tahun ajaran 2017/2018. Subjek dalam penelitian ini 36 siswa kelas X di salah satuÂ SMA di Cianjur. Hasil penelitian menunjukkan pada pencapaian siswa terdapat 75 % siswa memperoleh nilai sangat baik, rata-rata aktivitas siswa tergolong efektif dalam proses pembelajaran, respon siswa poritif terhadap bahan ajar, dan semua siswa dapat menyelesaikan soal-soal yang ada di LKS.

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

This research is executed as a mean to make laser with energyÂ from ex- materials ( DVD) to be used to determine refractive index andÂ difraction. For that, have been made laser diode appliance network used to determineÂ \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 ofÂ i1Â (30o, 45o dan 60o) equal to (1.53 Â± 0.07), (1.45 Â± 0.08) and ( 1.53 Â± 0.08). Green Laser wavelength at variation of N (100, 300 and 600 line / mm)successively equal to (500 Â± 0.03),Â Â (525 Â± 0.02) and (541 Â± 0.07). Pursuant to prism refractive index theory of[is level of 1.5 and green colour laser wavelength range from (500 â€“ 570) nm. So that can be concluded that result of research have as according to this appliance and theory haveÂ earned to be told good to used in study of optics

KAJIAN DAKTILITAS DAN KEKAKUAN PERKUATAN BALOK T DENGAN KABEL BAJA PADA MOMEN NEGATIF Dimas Langga Chandra Galuh; Hadi Pangestu Rihardjo
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 2 No 1 (2016): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Strengthening is a solution to improve supporting power of the boned concrete structure and strengthening the endurance of building. This research aims to find out the stiffness, ductility and cracking pattern of the negative moment area of beam. This research used three experimental beams, they are 1 control beam (BK), 1 strengthening beam 4Ã˜10 mm of steel cable on pulling area (BP1) and 1 strengthening beam using 4Ã˜10 mm of steel cable on pulling area and 2P8 mm on the pressing area (BP2) using mortar as the concrete blanket. The experimental object was in form of boned concrete beam T, with 2400 of length (l), 250 mm of height (h), 150 mm of width (bw), 400 mm of width of flens (t), 75 mm of height of flens (t). The steel cable and the diameter of boned steel used for strengthening process is 10 mm and 8 mm of plain type. The beam would be tested on the basis of flexibility by using static loading and simple support. The measurement of load, tension, and flexibility was done during the experiment (testing). Based on the results of experiment, it is shown that the maximum loads on the testing objects of BK, BP1, and BP2 respectively are 88.5 kN and 259 kN. The ratio of stiffness comparison of initial stiffness BP1 and BP2 to BK was 0.33 and 0.48. The ratio of ductility comparison of BP1 and BP2 to BK was 0,33 and 0.48. The collapsing pattern of each strengthening beam was debonding, but the steel cable on the strengthening beam still contributed the pulling tension, so the existing load kept on increasing until reaching maximum load.

VISUALISASI TETESAN AIR MENGGUNAKAN LATTICE BOLTZMANN Arifiyanto Hadinegoro
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 2 No 2 (2016): Agustus
Publisher : Universitas Sarjanawiyata Tamansiswa

Â Water is the important element in of live, every day met with the water, Water is a chemical element that is easily deformed, many factors influence began from nature of the water itself until gravity ,the laws of physics is also present in water droplets phenomenon One such the law of force. the unique nature the water is fairly difficult for computer engineering. However With the development of computer technology now can make a visualization that is similar to the events nature. like this techniques has been apply in making movies and also games, some are used for visual effects that could not be created a real. In this study, authors try to visualize the water droplets with a fluid with one method LatticeBoltzmann fairly simple and powerful in accuracy. Visualization is made a water droplet falling on a cross-section due to gravity at work.

FIKSATOR UNTUK PEWARNA ALAMI (Natural Dyes Fixator) Yasmi Teni Susiati; Enggar Kartikasari
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 3 No 1 (2017): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Natural dyes has a feature to produce soft colors. One of the natural dyes that can be used is pinang extract which applied to the jumputan textile. This research generally try to discover the effectiveness of pinang extracts for textiles coloring in terms of color fading endurance against the washing using whiting fixator and gambir. The research was conducted in PKK FKIP UST laboratory. The research population was: textiles, pinang extract, whiting and gambir. The research samples : textiles, pinang extract, whiting and gambir with the two treatments, the 10% and 20% concentration. This research using experimental methods and then tested in the Laboratorium Balai Batik. The assessment Â results Â of Â IndonesianÂ National Â StandardÂ (SNI) is Â grey Â scale. Visually, the result produced light brown color without the fixator, while using the whiting fixator produced a dark brown color and gambir produced yellowish brown color. Whiting fixator better than gambir because it produce sharper colors and has a higher value of color change.

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

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 asÂ 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

AMPLIFIKASI DAN ATENUASI GELOMBANG SEISMIK DI LAPISAN SEDIMEN PERMUKAAN Urip Nurwijayanto Prabowo; Marjiyono Marjiyono; Sismanto Sismanto
Science Tech: Jurnal Ilmu Pengetahuan dan Teknologi Vol 2 No 1 (2016): Februari
Publisher : Universitas Sarjanawiyata Tamansiswa

Soft sedimentary layer caused the amplification effect which amplified seismic wave. Besides of that, the soft sedimentary layer also have atenuation effect of seismic wave propagation. This research was conductedto evaluated the amplification and attenuation effect in soft sedimentary layer based on theoritical evaluation and 176 microtremor datas of Denpasar city which analyzed using HVSR method. The results of this research show that the value of amplification have a linier relation with the quality factor that have negative correlation with attenuation. The quality factors that calculated from HVSR curves are the quality factor of secondary seismic wave propagation

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Trio Ardhian

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Jalan Batikan No. 2, Tempel Wirogunan, Daerah Istimewa Yogyakarta

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Kota yogyakarta,

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INDONESIA