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INDONESIA
Jurnal technoscientia
Published by Institut Sains dan Teknologi AKPRIND
ISSN : 19798415     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Arjuna Subject : -
Articles 15 Documents
 1   2 
Search results for , issue "Technoscientia Vol 7 No 2 Februari 2015" : 15 Documents clear
SISTEM DETEKTOR ARAH SINYAL RF MENGGUNAKAN ANTENA DOPPLER Kristiyana, Samuel
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (722.79 KB) | DOI: 10.34151/technoscientia.v7i2.207

Abstract

Two-Way Communication technology uses electromagnetic waves growing very rapidly. Various areas of public life, military and emergency purposes using the radio frequency spectrum, which would be very helpful. This communication system weakness, can not be used to emit a frequency along the same Waku. When this happens as a result of communication will be closed (jammed) for crowded frequency sometimes even no intent to disrupt a lot happening in the field of communication such as radio amateur frequencies. Directional Finder conventional radio has served for many years used to look for the direct nuisance frequency transmitter that has now been inefficient in terms of time and operations. Doppler system applications with Adaptive systems can be used as the basis for the work of Radio Stand Finder to detect the direction of the position of the RF transmitter without direct mobility. Roanoke Doppler antenna designed with a system of switching and amplifier signal reception by the arrangement of square-4 half-wavelength antenna that can determine the direction of the RF signal. Adaptive system can help lock the receiver system information is based on strong towards the greatest signal intensity.
METODE ALTERNATIP PEMBELAJARAN MATEMATIKA GEOMETRI RUANG PADA TINGKAT SEKOLAH DASAR MELALUI PONSEL BERBASIS ANDROID -, Uminingsih
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (413.715 KB) | DOI: 10.34151/technoscientia.v7i2.208

Abstract

Learning methods have an important role to the success of student understanding of the learning material presented. In learning methods it is required media in the form of learning applications that can be used to deliver learning materials. Learning applications can use smart mobile phones (HP) to ease and interest the learning process so that the learning objectives ca be achieved. With the launch of Android HP technology where day today, increasingly relatively cheap price so that many people can reach them, including for their children . One of the features that android open source and open-platform does not depend on the manufacturing / certain vendors so it can be used in a wide variety of vendors. Therefore, in this study Android HP was utilized to provide a learning material in space geometry of mathematics that teach how to calculate the volume and area by applying the certain equations for various shapes . The trick is to embed an application program that has been made into HP. With the success of making the media application it is expected to help elementary school students to be more pleasure and easier to memorize mathematic formulas of the learning materials. By using this media through HP, students can learn anywhere, anytime and in any atmosphere.
THE EFFECT OF PH VARIATIONS ON MAGNETIC PROPERTIES OF MAGNETITE SYNTHESIZED FROM IRON SAND Wildan, Muhammad Waziz; Rusianto, Toto
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (704.558 KB) | DOI: 10.34151/technoscientia.v7i2.209

Abstract

Magnetite has been successfully synthesized from iron sand using co-precipitation method with variations of pH levels. The iron sand was obtained from South Coast of Yogyakarta. The iron sand was separated using a permanent magnetic bar to obtain the magnetic mineral, which is used as raw material. The raw material was ball milled to reduce the particle size down to ≤ 74 mm. It was then dissolved and stirred in HCl 37% at 80 oC for 3 hours. The reaction yielded a solution consisting of FeCl2 and FeCl3, which is called as a master solution. Ammonium hydroxide (NH4OH) 20% was added to the master solution to obtain Fe-oxide precipitation. The precipitation process depended on the pH of the solution, so the pH of the solution was arranged using variations of NH4OH contents. The volume ratios of the master solution and NH4OH were A (2:1), B (1:1), C (1:2) and D (1:3), they were designated as samples A, B, C and D, respectively. Those various compositions yielded solutions with various pH levels, i.e. 5, 8, 10 and 11, respectively. The black powder precipitation was immediately formed during the reaction. The powders were analyzed using XRD. The magnetic properties were measured using vibrating sample magnetometer (VSM). TEM was used to observe the particle size. From the XRD, it was found that magnetite compound was found on the solution with pH level ≥ 8. Magnetic properties test show that Ms (saturation magnetization) is 43 emu/gr found on the solution with pH level of 8. TEM images show that the smallest particle size found on the solution B with pH level of 8. Magnetic Nanoparticles (MNPs) with superparamagnetic properties can be synthesized from iron sand.
Jurnal Technoscientia Vol 7 no 2 Februari 2015-Cover-Daftar isi Technoscientia, Jurnal Teknologi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.734 KB) | DOI: 10.34151/technoscientia.v7i2.697

Abstract

Jurnal Technoscientia Vol 7 no 2 Februari 2015-Cover-Daftar isi
Jurnal Technoscientia Vol 7 no 2 Februari 2015-Full Paper Technoscientia, Jurnal Teknologi
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 7 No 2 Februari 2015
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5280.288 KB) | DOI: 10.34151/technoscientia.v7i2.698

Abstract

Jurnal Technoscientia Vol 7 no 2 Februari 2015-Full Paper

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