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All Journal Jurnal Ners Indonesia Komunikasi Fisika Indonesia Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan

Erwin '

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Author-ID : 2979886

Dentistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Health Professions Materials Science & Nanotechnology Mathematics Nursing Physics Public Health Veterinary

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PENGARUH INTI KOIL TERHADAP TEGANGANINDUKTOR DAN RESISTOR YANG DIRANGKAI SECARA SERI Salomo '; Erwin '; Surya Ningsih
Komunikasi Fisika Indonesia Vol 10, No 6 (2013)
Publisher : Universitas Riau

Telah dibuat koil (solenoida) dan inti koil yang bervariasi. Koil divariasikan dengan jumlah lilitan: 50 lilitan, 100 lilitan, 150 lilitan dengan panjang 5 cm dan diameter 3,5 cm, sedangkan inti koil divariasikan dari beberapa material seperti Fe (besi), Cu (tembaga), dan Al (aluminium) dengan panjang 5 cm dan diameter 3 cm. Koil ini dirangkai secara seri dengan resistor yang memiliki resistansi 150 Ω, sumber tegangan dan saklar, kemudian dilakukan pengukuran tegangan induktor dan resistor pada koil. Pengukuran ini dilakukan untuk koil tanpa inti dan koil dengan tambahan inti Fe, Al, serta Cu. Berdasarkan hasil pengukuran diperoleh tegangan induktor menurun seiring pertambahan waktu, besarnya tegangan tersebut juga dipengaruhi oleh medan magnet koil. Penambahan inti Fe pada koil 150 lilitan menghasilkan tegangan induktor sebesar 2,54 volt saat t = 5 detik, sedangkan penambahan inti Cu menghasilkan tegangan induktor sebesar 0,42 volt pada waktu yang sama. Tegangan resistor pada koil 100 lilitan dengan inti Fe adalah 0,21 volt pada t = 5 detik, namun begitu intinya diganti dengan Cu tegangannya menjadi 2.42 volt. Ini berarti koil dengan medan magnet besar akan menghasilkan tegangan induktor yang besar sedangkan tegangan resistor utuk koil dengan medan magnet besar akan bernilai kecil.

PRODUKTIFITAS WAKTU KERJA PERAWAT DI RUANG RAWAT PENYAKIT DALAM DAN BEDAH RSUD ARIFIN ACHMAD PROVINSI RIAU Erwin '; Nofrita Sari; Lita '
Jurnal Ners Indonesia Vol 1, No 2 (2011)
Publisher : Fakultas Keperawatan, Universitas Riau

Penelitian ini berlujuan urUuk mendapalkan gambaran prouuktifitas waktu kerja perawat ruang rawal map penyakit dalamdan bedah di R S U D A r i d n A c h m a d Provinsi Ruui. Jems penchlian ini adalah penelitian kuanlUalil dengan designdeskriptif Sampel dalain penelitian mi ditentukan melalui teknik nan prohahilitvsampliny,, yailu secara purposivesamplingsejumlah 62 perawat. Data dikumpulkan melalui observasi langsung menggunakan metode Time and motionstudy . Hasil penelitian ini mcnunjukkan bahwa produktivitas waktu kerja perawat ruang rawat map yang dilakukan sesuaidengan perannya adalah sebesar 61,6% untuk ruang rawat penyakit dalain dan 70% untuk ruang rawat bedah. Alokasiwaktu kerja produktif pada kedua ruangan tersebut lebih Imggi pada shift pagi yaitu masing-masing scbanyak .348 menit(83%) dan 361 menit (85%) dan dan 5 hari pengamatan (senin-jumat). waktu kegiatan produktif tertinggi di ruang penyakitdalam adalah pada hari senin, sedangkan diruang bedah ada pada han selasa. Disarankan kepada institusi pelayanankeperawatan untuk membuat pembagian tugas yang lebih proporsional bagi setiap perawat sehingga mempunyai bebankerja yang relatif sama dengan mengoptimalkan metode penugasan keperawatan tun.

DESAIN PEMBUATAN DAN UJI COBA KUMPARAN HELMHOLTZ BERBENTUK LINGKARAN Ginisa Ardiyani; Erwin '; Salomo '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Design and study of Helmholtz coils have been carried out. The coils diameter was designed of about 13 cm and number of turns of 50, 100, 150, 200 and 250. Magnetic field that produced by those coils was measured using pasco magnetic probe PS-2162 as a function of an applied current, distances and number of turns. As comparison, then the magnetic field produced by these coils had been compared to the standard one. Maximum value of magnetic field was obtained at the center of the coil. For an applied current of 2 A, then the magnetic field at the center of the coils either standard one or the designed one was 7.156 x 10-5T and 5.907 x 10-5T respectively. The value of magnetic field increases as number of turns and current are increased, for the coils with number of turns of 50 and 250 that carrying current of 1.0 A produced a magnetic field of 5.241 x 10-5T and 6.208 x 10-5T respectively. This is due to the direct relationship between current (I) and number of turns (N) against magnetic field as expected. The value of magnetic field decreases as moving away from the center of coil either in horizontal or vertical direction.

PENGUKURAN TINGKAT KEBISINGAN DI JALAN RAYA PEKANBARU-BANGKINANG SEBELUM DI BANGUN BEBAS HAMBATAN (HIGHWAY) Mutiara Akhdesia; Erwin '; Defrianto '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Measurement of the noise level in the roadway of Pekanbaru-Bangkinang before building of Highway has been done. The sources of noise originated from the sound of vehicles that passed through the roadway. The level of noise has been measured by using a Sound Level Meter (SLM). The measurement of noise level carried out in two locations, first location was on roadway of Pekanbaru-Bangkinang KM 21 and the second location was at round aboard of Jalan Garuda Sakti and Jalan PekanbaruBangkinang. The noise level at first location was measured as a function of time from 07.00 until 18.00 pm during one week. In this research, the number of vehicles that passed through the first location have been counted every hour. Furthermore, the noise level was measured as a function of distance from the noise source using two SLMs, namely SLM type MS 6701 and SL 4112. The results showed that the noise level at the first location occurred on Saturday and Sunday at 16.00 to 18.00 with the highest value of 79.09 dBA and 78.28 dBA respectively, while the lowest noise value occurred on Friday at 12.00 to 13.00 pm with the value of 67.97 dBA. The highest noise level at the second location occurred at 17.00 to 18.00 with a value of 81.60 dBA. The value of noise level at the second location was higher compared to that of the first location. This was due to more number of vehicles that passed through that location compared to that of the first location. The profile of noise level occurred on Saturday was compared to that of the theoretical calculations. The result showed that both results had a similar characteristics. Moreover, the results of this research showed that the level of noise as a function of distance from the noise source was decrease with increasing the distance. The decrease of the noise level was caused by the absorption of the noise by the surrounding parameters such as air,vegetation and buildings nearby.

PENENTUAN TINGKAT KEBISINGAN SEPEDA MOTOR KNALPOT STANDAR DAN MODIFIKASI Nasib '; Erwin '; Juandi M
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

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The noise level produced by standard and modified motorcycles exhaust has been investigated. In this research, there were three types of motorcycles used namely Honda, Suzuki and Yamaha. Noise levels that generated by those motorcycles were measured using Sound Level Meter (SLM) SL 4112. In order to eliminate noise from other sources 5 different angles (0o, 45o, 90o, 135o, and 180o) were used, then the measurement of noise from the motorcycles exhaust was done 2m from the exhaust. The results of the measurement showed that sound intensity generated by standard motorcycle exhaust at angle of 90o produced maximum value of 78,17 dB, 79,62 dB and 97,55 dB for Honda, Suzuki and Yamaha respectively. By modifiying the exhaust, the noise level produced of Honda, Suzuki and Yamaha were 97,48 dB, 97,62 dB and 97,55 dB respectively. The significant increase of noise level for modified exhaust with muffler was caused by several factors such as muffler and diameter of exhaust. The range value of noise level for the standard exhaust was measured at the angle of 90oand the engine variation of 5000 rpm was 78,66 dB while for the modified exhaust produced an average value of 97,55 dB with the same position and engine variation.

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

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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.

PENGUKURAN TINGKAT PENYERAPAN BUNYI KEPINGAN BATANG KELAPA SAWIT DENGAN MENGGUNAKAN TABUNG IMPEDANSI Septina Sari; Erwin '; Krisman '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 1, No 1 (2014): Wisuda Februari 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Research on measuring of levels of sound absorption by a piece of palm trunk wasdone. Sample of palm trunk used in this study was 22 years old and made intorectangular pieces with a size of 23 x 23 cm. The thickness of the samples was varied,namely 6mm, 9mm, 15mm. The source of sound used was generated from sweepfunction generator. The sound intensity inside the impedance tube before and afterpenetrating the sample was recorded using sound level meter. The sound frequencyrange used in this research was 100 Hz - 1000 Hz. The results indicated that in general,the sound intensity increases with the increase of sound frequency. However, theintensity of the sound was reduced very significantly after penetrating the sample insidethe tube. For high frequency, namely 1000 Hz then the percentage of sound absorbtionby a piece of trunk palm with the thickness of 6 mm, 9 mm and 15 mm was 3.4 %, 5.7% and 14 % respectively, while, for low frequency, namely 100 Hz, then the percentageof sound absorbtion by the material with the thickness of 6 mm, 9 mm and 15 mm was5.6 %, 8.3 % and 12 % respectively

PENGARUH KETEBALAN BAHAN ALUMINIUM TERHADAP INDUKSI MAGNETIK YANG DITIMBULKAN OLEH TELEPON SELULER Lendra Kusma; Erwin '; Salomo '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Nowadays, a cellular phone is an important communication tool therefore, biologically the electromagnetic radiation produced from the cellular phone on the users become relevant. The measurement of magnetic induction generated by three brands namely A, B and C of cellular phone was carried out. The measurement was done for two directions such as horizontal and vertical direction. In order to investigate the effect of alumunium thickness on magnetic induction, several slabs of alumunium with the thichness of 1 mm – 4 mm were prepared. An instrument used for measuring the magnetic induction was magnetic sensors Pasco 2162. The magnetic induction was measured in horizontal direction at a distance of 0,5 cm from cellular phone with and without using an aluminium slab. The results showed that the magnetic induction in horizontal direction generated by cellular phone brand A is highest among A, B and C with the value of 1,09x10-4 Tesla, 1,07x10-4 Tesla, 9,75x10-5 Tesla respectively. The value of magnetic induction generated by a cellular phone reduces when a slab of alumunium was inserted between cellular phone and sensor. The measurement of the magnetic induction in a vertical direction shows that the further distance of the sensor to the cellular phones and the smaller the magnetic induction observed. The result also showed that the value of magnetic dipole moment of cellular phone based on the plot of magnetic induction versus distance is 1 Am2.

ANALISIS SPEKTRUM SUARA MANUSIA BERDASARKAN JENIS KELAMIN (GENDER) DAN KELOMPOK UMUR MENGGUNAKAN KOMPUTER Widia Rahim; Erwin '; Usman Malik
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Research on analysis of human voice spectrum based on gender and age group has been conducted. To record the human voice, it was used a microphone and a computer equipped with a software called “Praat” as a substitute for spectrum analyzer. From the voice spectra, it was obtained the fundamental frequency (pitch) and formant. The sample of the human voice was recorded based on the male and women voice which divided into age group such as children aged 8-11 years, adult 19-23 years and elderly aged above 50 years. In this research, it was used 3 pieces of said, namely “Universitas Riau”, “Selamat Datang” and “Mari Berjuang”. The result of this research indicated that pitch of male was lower than that of women. In general, the relationship between pitch and age showed that the pitch decreases as the age increases. For male, the pitch decreases very significantly from 245,8 Hz to 124,6 Hz as the age increases from children to elderly, while for women the decrease of pitch was linear with small slope. The average formant value for boys is a little bit higher than that of girls which is 525 Hz and 512 Hz respectively. In general, the value of first formant (F1) decreases as the age of human increases.

ANALISA PENGARUH KETEBALAN LEMPENGAN BESI (Fe) TERHADAP INDUKSI MAGNETIK YANG DITIMBULKAN OLEH BEBERAPA MEREK TELEPON SELULER Ikrah Noprianti; Erwin '; Salomo '
Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Vol 2, No 1 (2015): Wisuda Februari 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam

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Nowadays, a cellular telephone is predicted to generate the effect of electromagnetic radiation on the users. In this research, the measurement of magnetic induction generated by three cellular telephones (sample A, B and C) was demostrated. The measurement was performed in two directions namely horizontal and vertical directions. In order to measure the magnetic induction, was used a Pasco magnetic probe 2162. The magnetic induction in the horizontal direction was measured with the distance of 0,5 cm from the cellular telephone. The effect of a slab of iron with various thicknesses namely 1-4 mm on magnetic induction was also studied. The results of this research showed that the value of magnetic induction generated by the cellular telephone sample A is the highest among brand B and C with the value of 7.73300x10-4 Tesla and followed by sample B and C with the value of 3.6241x10-4 Tesla and 1.41615x10-4 Tesla respectively. The value of magnetic induction in vertical direction decreases very significantly with the distance. Moreover, the magnetic induction increases when a slab of iron with the thickness of 1 mm to 4 mm was introduced.

Co-Authors Azura ' Defrianto Defrianto Endah Mulyani Ginisa Ardiyani Hera Didana Herianto ' Ikrah Noprianti INDAH CAHYANI Juandi Juandi Krisman ' Lendra Kusma Lita ' M. Rasyid Ridho Mbantun Ginting Mutiara Akhdesia Nasib ' Natalia ' Nofrita Sari Nuraini ' Ramadhani Herlly Riad Syech Rika Sawitri Rio Fauzi Salomo ' Septina Sari Silvia Noviana Sukendi Sukendi SURYA NINGSIH Usman Malik Widia Rahim Zulkarnain '

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