cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota pekanbaru,
Riau
INDONESIA
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam
Published by Universitas Riau
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 424 Documents
 16   17   18   19   20 
AUTOMATISASI KALIBRASI SENSOR SUHU PTC DAN NTC MEMPERGUNAKAN SUMBER TEGANGAN TERPROGRAM DAC7611 Herman Syahputra; Lazuardi Umar; Rahmondia Nanda Setiadi
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A system  calibration  of  PTC  and  NTC  temperature  sensor  using a preprogrammable voltage source based on DAC7611  was  designed.  Temperature  sensors  of  PTC  typethermistor used was a type of  RS  and  NTC  type  was  B57962  S282  using  a  standard voltage divider with resistance to both sensors. Sensor voltage was  increased with a step interval  of 1V  and  time  equilibrium  sensors  of  120  s.  The characteristic  of  the sensor were  modeled  in the form of  the curve  I(U)  based on the  self-heating  effect  (Self-Heating).  Results of  measurements  and  modeling  using  automatic  and  manual calibration  showed  two curves  coincided,  but  there  was  a difference  of  5,8mA maximum  current  for  the PTC  sensor  and  0,552mA  for  NTC  sensor.  These resultsindicated  that the  manufacturing  of  automatic  calibration system  worked  and  only  had  a small difference to the  manual calibration. This was due to the difference in  temperature of the ambient.
KARAKTERISASI BAHAN FEROELEKTRIK BARIUM STRONTIUM TITANAT (Ba0,7 Sr0,3TiO3) MENGGUNAKAN MIKROSKOP IMBASAN ELEKTRON (SEM) Rizki, Befriana Ayu; Dewi, Rahmi; ', Sugianto
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Ferroelectric  of Ba0,7Sr0,3TiO3  has been made  from  BaCO3  (Barium Carbonat), SrCO3(Strontium Carbonat),  and TiO2  (Titanat Oksida)  with variation  of  calcination temperatures  of  600oC, 700oC,  and 800oC.  Ferroelectric product  of Ba0,7Sr0,3TiO3  was characterized by Scanning Electron Microscopy (SEM). Sizes  of ferroelectric particle increased  with  sintering  temperatures,  as follow  1,67µm, 2,27µm,  and 2,38µm for samples with high temperature  of  600oC, 700oC and 800oC. Respectively then  the density of particle decreased with  temperature i.e 5,03x10-4 %, 4,40x10-4 %, and 1,52x10-4 %.  The average value of resistance increased  with  calcination  temperature  and sintering  temperature of 400oC, 600oC, 700oC and 800°C  i.e  6,716x108Ω, 6,740x108 Ω, 6,754x10 8 Ω and 6,768x108 Ω, as well as the value of the average resistivity increased with  rise  in calcination  temperature  and sintering temperature  as follow 193,122x108 Ωm, 194,884x108 Ωm, 196,784x108 Ωm,  and 198,882x108Ωm. These  were due to the effect of temperature on the arrangement  of the material  atoms.  It was concluded then the resistivity of a material does not depend on its geometric shape but depend on the temperature of the material.
PENENTUAN DISTRIBUSI INDUKSI MAGNETIK YANG DITIMBULKAN OLEH BERBAGAI JENIS TELEPON SELULER DENGAN MENGGUNAKAN PROBE MAGNETIK PASCO Herianto '; Erwin '; Mbantun Ginting
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The distribution of induced magnetic field due to various kinds of cellular telephone has been investigated. The induced  magnetic  field was measured using  Magnetic  Probe Pasco in two directions  namely  horizontal  dan  vertical. In horizontal direction the induced  magnetic  field  was  measured  with the distance of 0,5 cm above the cellular telephone.  The result showed that the  widest  distribution of  magnetic  field  was generated by Sony Ericcson cellular telephone, while Samsung cellular  telephone generated the narrowest value of induced  magnetic  field.  Moreover,  the highest and lowest  value    induced  magnetic  field  were  generated  by Sony Ericcson and Sony were 2,4x10-3Tesla and 1,2x10-3Tesla respectively. In  vertical  direction,  the induced magnetic  field was reduced significantly  the  as measured  away from the cellular telephone. The value of magnetization  was  highest from Samsung cellular telephone and  the  lowest from Blackberry. The value of magnetization from Samsung and Blackberry was 9,26x10-5emu/cm3 and 7,16x10-5emu/cm3 , respectively.
PEMBUATAN KARBON AKTIF DARI CANGKANG KELAPA SAWIT DENGAN MENGGUNAKAN H 2 O SEBAGAI AKTIVATOR UNTUK MENGANALISIS PROKSIMAT, BILANGAN IODINE DAN RENDEMEN Hafnida Hasni Harahap; Usman Malik; Rahmi Dewi
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Activated carbon from shells of oil palm has succesfully been made. It was carbonizedat 400 ̊C, 500 ̊C and 600 ̊C for 20, 40 and 60 minutes. The physical activation wascarried out at the temperature of 900 ̊C for 20, 40 and 60 minutes. This activation wasdone by flowing the water vapor as an activated agent. The objective of this researchwas to characterize palm oil shells that was carried out through proximate test whichwere water content and ash content, the absorbane of activated carbon toward iodinevalue and yield. The best results after carbonization were the samples that werecarbonized at 600 ̊C for 60 minutes, with proximate content : water content of 4,5% andash content of 9.7%. The iodine number at activation of 900 ̊C for 60 minutes was 353mg/ gr and yield of 48%.
PEMBUATAN KARBON AKTIF DARI PELEPAH KELAPA SAWIT MENGGUNAKAN AKTIVATOR H 2 O SEBAGAI ADSORBEN Amalia Aisha Noer; Awitdrus '; Usman Malik
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Activated carbon has successfully been made from a raw material of oil palm midrib atcarbonization temperature of 500°C for 20, 40 and 60 minutes. Physical activation wasconducted using steam as activator agent at temperature of 900°C for 20, 40 and 60minutes. The objective of this research was to study the characteristics of oil palm midrib as an activated carbon. The characteristics of activated carbon were characterized by loss weight analysis, proximate and ultimate test, iodine number and yield. The results showed that the best activated carbon were the samples that were carbonized and activated in 60 minutes with loss weight of 67,8%, water content of 5,5%, ash content of 8%, carbon content of 50,23%, hydrogen of 3,38%, and oxygen of 43,18%. The iodine number analysis confirmed the iodine number of 200% which was higher than the Indonesian Industrial Standard values and yield of 42,3%.
STUDI ORIENTASI PEMASANGAN PANEL SURYA POLY CRYSTALLINE SILICON DI AREA UNIVERSITAS RIAU DENGAN RANGKAIAN SERI-PARALEL Ridho Ravita Wardy; Krisman '; Cahyo Budi Nugroho
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A research has been conducted on the study of the orientation of the criystalline poly silicon solar panel installation at the University of Riau area using a series - parallel circuit. The research was conducted from June 1 to June 14 2014 using solar panels of 4 types of poly silicon criystalline that were arranged in parallel using a series - parallel circuit. From the results of this study, the optimal time and angle of the poly crystalline silicon solar panel was at 09:00 pm at coordinates 00 0 .28.661' LU 101 0 .22.554' BT with elevation angle of 129.36 0 . The power generated was 34.2907 Watt. The power generated by the solar panels was influenced by the temperature, the higher the temperature was the smaller the power generated. Power output of solar panels was influenced by weather conditions. The power generated by the solar panels in sunny weather was greater than that was on a cloudy day. The average power for 14 days was 21,17862 Watt.
IDENTIFIKASI DAN UJI FITOKIMIA EKSTRAK ALAMI TANAMAN ANTIUROLITHIASIS Tami Oktari; Fitmawati '; Nery Sofiyanti
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

In Indonesia, medicinal plants have been used to treat several diseases including kidney stone disease (urolithiasis). Urolithiasis is caused by the accumulation of substances inhuman urine that will form a stone, which consists of solid microlite. This stone can grow bigger if it is not treated. The kidney stone problem is the third problem after urine tract and prostate infection. Therefore, it is necessary to find out the treatment for this disease, including by using the potential plants for antiurolithiasis such as Hibiscus rosa-sinensis, Hibiscus tilliaceus, Sonchus arvensis, Sida rhombifolia, Strobilanthus crispus, and Tristaniopsis whiteana. The purpose of this study was to compare the effectiveness of six medicinal plants in dissolving kidney stones using in vitro methodand to identify their secondary metabolites that have the best potential as antiurolithiasis agent. Two tests were caried out, i.e. phytochemical test and in vitro test for detecting plant extract activity in disolving kidney stone. The extract used was pure extract. The kidney disolving test was performed at 37°C for 3 hours with 15 minutes agitation. The result of phytochemical test showed that Sonchus arvensis and Sida rhombifolia had the highest secondary metabolite content. The in vitro assay showed that all of six tested plants could disolve kidney stone. Two species (Hibiscus tilliaceus and Sonchusarvensis) gave the lowest weight of kidney stone, however there was no significant difference in each treatment (P>0,05).
PENENTUAN EFISIENSI KOLEKTOR PELAT DATAR DENGAN PENUTUP KACA PADA SISTEM PEMANAS AIR SURYA Zelviana '; Maksi Ginting; Sugianto '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A  research has been conducted to determine the efficiency of flat plate collector  with  its cover  made from  glass. Solar water heaters  were  made  and  comprised of five essential components, namely a  protective box,  a  plate absorbent,  an  insulator,  an  iron pipe, and a  transparent cover. In this study, the water  was flown  into the water tank, through  a  collector, and then  the  water  flowed  into a  tube  collectors.  The  collectors  used  in this  study  were  flat plate  collectors  with one and two layer lid.  The  data  was  collected  within 14 days,  starting from  9.00 am until  3.00 pm  WIB  with one hour time interval.  The average  efficiency  for  a single  layer collector  was  42.62 % to 62.14 % , and for the two layer collectors  was  51.69 % to 85.74 % . These results  showed that the loss of heat on a flat plate collector with two layer was smaller than those of a single layer collector.
RANCANG BANGUN RANGKAIAN TIMER OTOMATIS PESAWAT ATWOOD Dema Siska Afrilla; Walfed Tambunan; Sugianto '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A research has been conducted on designing of an automatic  atwood  experiment using an  automatic  timer.  The  automatic timer  consisted  of  3  important components, four relays,  a  stopwatch, and  an  accelerometer.  This automatic  timer  was used to  determine the duration time of the weight falling  from a certain height.  Testing  of the timer was performed on the atwood machine with mass m1 0,2 kg and m2 0,22 kg. This experiment was done at  heights of 0,3  m, 0,4 m, 0,5 m, 0,6 m, 0,7 m, and 0,8 m, respectively.   The experiment results were compared to the results of the same experiment but using a stopwatch instead of the automatic timer. Both of the experiments, using the automatic timer and the stopwatch are compared to the theoretical calculation. The results showed that the error percentage using the automatic timer ranged from  1,95 % -  4,34 %  while the error percentage using stopwatch ranged from  5,96% to 12,88%, respectively. It showed that the result using the automatic timer gave lower percentage of error than the result using the stopwatch.
PENENTUAN KONDUKTIVITAS LISTRIK DAN KAJIAN KUALITAS AIR SUNGAI SIAK MENGGUNAKAN METODE JEMBATAN WHEATSTONE Alan Perdana Aritonang; Riad Syech; Walfred Tambunan
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 2 (2014): Wisuda Oktober 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A research has  been done on  the determination of the electrical conductivity and  water quality  of Siak River water  using a Wheatstone bridge method  in   the  location around the rubber factory   of PT. RICRY. The research was begun by taking samples  of the Siak river water were taken on  five  points  which  have been determined at a distance of 10 meters from PT. RICRY when was low  and high  tide. Based on the  length  data  of wire L1  and L1,  it  could  be determined  the value of electrical resistance, resistivity  and electrical conductivity. The result showed that the value of  highest  electrical conductivity of the river  water  when the  sea  water was  at  high tide  was  58,513  .  10-6 (Ωm)-1, while the electrical conductivity of  the river  water at low tide  was 41,879  . 10-6 (Ωm)-1. A decent water for consumption has an  electrical conductivity of (300  -500).106(Ωm)-1(Mailinda, U. 2011). Based on  that  standard  electrical conductivity, Siak river  water  in  the  research location when the sea water  high tide and low tide are not worthy to be consumed because  of  too small  value  compared  to  the standard   value of electrical conductivity .

Page 18 of 43 | Total Record : 424

 16   17   18   19   20 

Filter by Year

2014 2015


Reset
Filter By Issues
All Issue Vol 2, No 2 (2015): Wisuda Oktober 2015 Vol 2, No 1 (2015): Wisuda Februari 2015 Vol 1, No 2 (2014): Wisuda Oktober 2014 Vol 1, No 2 (2014): Wisuda Oktober 2014 Vol 1, No 1 (2014): Wisuda Februari 2014 Vol 1, No 1 (2014): Wisuda Februari 2014