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Krisman '
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Physics

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Pengukuran Koefisien Absorpsi Bunyi Dari Limbah Batang Kelapa Sawit Krisman '; Defrianto '; Debora M Sinaga
Komunikasi Fisika Indonesia Vol 9, No 5 (2012)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (284.759 KB) | DOI: 10.31258/jkfi.9.5.415-423

Abstract

Telah dilakukan penelitian pengukuran koefisien absorpsi bunyi berbahan dasar limbah batang kelapa sawit.Batang kelapa sawit yang digunakan dalam penelitian ini diolah menjadi papan persegi dengan ukuran 23 cm x 23cm sebagai sampel uji. Sampel kemudian dipotong menjadi 4 buah dengan ukuran yang sama tetapi ketebalandivariasikan, yaitu 3 mm, 6 mm, 9 mm dan 15 mm. Pengukuran koefisien absorpsi bunyi dari sampelmenggunakan metode tabung impedansi yang terbuat dari akrilik. Range frekuensi yang digunakan dalampenelitian ini adalah 125 Hz, 250 Hz, 500 Hz, 1000 Hz, dan 2000 Hz. Hasil penelitian ini menunjukkan bahwanilai koefisien absorpsi bunyi tertinggi yaitu 1.1754 mm-1 pada frekuensi 2000 Hz. Sedangkan, koefisien absorpsibunyi terkecil adalah 0,156 mm-1 pada frekuensi 125 Hz. Nilai koefisien absorpsi bunyi dari sampel padafrekuensi rendah (125-500 Hz) cukup kecil dibandingkan pada frekuensi tinggi. Koefisisen absorpsi bunyimeningkat seiring meningkatnya frekuensi. Hasil penelitian pada frekuensi 125-500 Hz menunjukkan bahwakoefisien penyerapan suara sampel dipengaruhi ketebalan sampel. Koefisien penyerapan suara dari sampelmeningkat ketika ketebalan sampel diperbesar.
KARAKTERISASI MATERIAL FEROELEKTROK Ba(1-x)Sr(x)TiO3 (BST) UNTUK KOMPOSISI x=0,1; 0,2 dan 0,3 Rahmi Dewi; Krisman '; Zuhdi '
Komunikasi Fisika Indonesia Vol 11, No 9 (2014)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (239.231 KB) | DOI: 10.31258/jkfi.11.9.577-581

Abstract

Barium Strontium Titanate, Ba0.9Sr0.1TiO3, Ba0.8Sr0.2TiO3 and Ba0.7Sr0.3TiO3 (BST) samples were prepared usingsolid state chemical reaction. The microstructure of these samples were characteritation using the X-ray Diffractiontechnique (XRD) and Scanning Electron Microscopy (SEM). Then the samples were composition variationdifferent annealed at 700oC a for 60 minutes in air. The XRD characterization showed that the crystallizationimproved as the barium increased. The microstructure showed that the samples were homogeny with the grainsize were uniform. The grain size samples increases with the strontium increased.
ANALISA TINGKAT REDUKSI KEBISINGAN OLEH BAHAN BUSA PADARUANG TERTUTUP DALAM SKALA LABORATORIUM Krisman '; Riad Syech; Rosdiawan Obby Novaldy
Komunikasi Fisika Indonesia Vol 13, No 13 (2016)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (559.498 KB) | DOI: 10.31258/jkfi.13.13.907-911

Abstract

Telah dilakukan penelitian terhadap bahan material busa menggunakan metode pengukuran pada ruang tertutup untuk menentukan nilai reduksi bunyi yang dihasilkan oleh speaker pada frekuensi tertentu. Bahan busa memiliki spesifikasi massa jenis berturut-turut 0,003 ⁄ , 0,0031 ⁄ , dan 0,0033 / serta memiliki volume 20 cm x 20 cm x 1,7 cm. Setiap sampel diukur pada jarak 30 cm, 50 cm dan 70 cm dari speaker. Hasil pengukuran dianalisa menurut jarak, massa jenis dan frekuensi. Berdasarkan hasil penelitian nilai Insertion Loss untuk sampel A, B dan C pada frekuensi 125 Hz dengan jarak 30 cm memiliki nilai 0,7 dB, 1 dB dan 1,1 dB. Nilai Insertion Loss ini meningkat seiring dengan meningkatnya massa jenis. Nilai Insertion Loss semakin bervariasi pada frekuensi yang lebih besar dari 500 Hz, hal ini dikarenakan bahan busa yang digunakan tidak mampu meredam kebisingan dengan frekuensi yang tinggi.
DESAIN PEREDAM SUARA TABUNG KACA DENGAN SAMPEL CAMPURAN SERBUK KAYU MERANTI DAN PAPAN TELUR UNTUK MENGUKUR KOEFISIEN ABSORBSI BUNYI Riad Syech; Krisman '; Angeline Stefan
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.36 KB) | DOI: 10.31258/jkfi.12.10.666-672

Abstract

Telah dilakukan penelitian penyerapan gelombang bunyi oleh peredam suara tabung kaca dengan sampel campuran serbuk kayu meranti dan papan telur. Penelitian ini menggunakan metode eksperimen dengan mendesain tabung impedansi yang terbuat dari kaca dengan ukuran 92cm x 20cm x 20cm. Range frekuensi yang digunakan dalam penelitian ini adalah 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz. Sampel dibuat dengan cara melakukan perbandingan komposisi serbuk kayu meranti : papan telur : tepung kanji yaitu 72%:25%:3% ; 62%:35%:3% ; 50%:47%:3% ; 47%:50%:3% ; 35%:62%:3%; 25%:72%:3% dan variasi ketebalan yaitu 3mm, 6mm, 9mm. Hasil penelitian ini menunjukkan bahwa nilai koefisien absorbsi bunyi tertinggi yaitu 0,9287 pada ketebalan 3mm frekuensi 1000Hz serbuk kayu meranti 25% dan papan telur 72%. Nilai koefisien absorbsi terkecil adalah 0,1946 pada ketebalan 9mm frekuensi 125Hz serbuk kayu meranti 72% dan papan telur 25%.
KARAKTERISASI DIFFRAKSI SINAR-X (XRD) MATERIAL FERROELEKTRIK BARIUM TITANAT (BaTiO3) Rahmi Dewi; Krisman '; Usman Malik; Fauzan '
Komunikasi Fisika Indonesia Vol 10, No 7 (2013)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.023 KB) | DOI: 10.31258/jkfi.10.7.513-515

Abstract

Ferroelectric material Barium Titanat (BaTiO3) has been made with the comparison of 1:1from chemical reactionof Barium Carbonat (BaCO3) and Oxide Titanium (TiO2). The sample at pra-sinter at temperature of 400oC and printed in the form of pellets.The pellet were anneled with the temperature of 700oCand then characterized using XRD. The results of characterization using XRD was described on a graph between the intensity versus 2 theta angle. TheXRDresultsBaTiO3 before annelingdoes not show any peaks, this mean that the structure of BaTiO3before annelingis amorfus structure. The XRDresult BaTiO3 after annelingshowedsome peaks, the positions of the peaks on 2θ are 23.32°, 32.72°, 38.40o, 45.52o, 52.04°, 57.80o. After anneling, the peaks become wider, this mean the samples become crystaline in structure. At standard temperature (0oC to 320oC) the samples of BaTiO3 has tetragonal formbut on the temperature 700oC after being anneledit changed into Cubic.
PENGARUH PARAMETER FISIS TERHADAP JUMLAH AIR YANG MENGUAP DI KOTA PEKANBARU Krisman '; Riad Syech; Subehan '
Komunikasi Fisika Indonesia Vol 8, No 3 (2011)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (195.606 KB) | DOI: 10.31258/jkfi.8.3.%p

Abstract

Telah dilakukan penelitian tentang pengaruh parameter fisis terhadap jumlah air yangmenguap di kota Pekanbaru. Metodologi yang digunakan dalam penelitian ini adalah metodestatistika regresi linier ganda. Data-data yang digunakan merupakan data sekunder yangdiperoleh dari Badan Meteorologi dan Geofisika Bandara Sultan Syarif Kasim II PekanbaruRiau. Dengan menggunakan metode statistika analisa regresi linier ganda, dapat diketahuiadanya pengaruh antara kelembaban udara, kecepatan angin dan suhu udara terhadap jumlahair yang menguap sehingga diperoleh nilai korelasi antara parameter fisis terhadap jumlah airyang menguap. Nilai korelasi ini menunjukkan hubungan yang kuat antara variabel-variabeltersebut yang diperhitungkan setiap bulan. Penguapan tertinggi tahun 2008 terjadi pada bulanOktober yaitu sebesar 4,9 mm dan penguapan terendah terjadi pada bulan juli yaitu sebesar3,9 mm dan penguapan tertinggi tahun 2009 terjadi pada bulan Maret yaitu sebesar 6,4 mmdan penguapan terendah terjadi pada bulan Februari yaitu sebesar 3,9 mm sedangkanPenguapan tertinggi tahun 2010 terjadi pada bulan Mei yaitu sebesar 6,9 mm dan penguapanterendah terjadi pada bulan Desember yaitu sebesar 3,5 mm.
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

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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.
PENENTUAN PENGURANGAN KEBISINGAN OLEH KARPET PADA RUANG TERTUTUP Yugo Setiawan; Juandi M; Krisman '
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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Abstract

It has been done a test of noise reduction using carpet by variating its thichness and its distance to noise source in a room (glass box). The thichnes of carpet was 0,246 cm, 0,492 cm and 0,738 cm. The noise reduction was measured at three different position of 30 cm, 50 cm and 70 cm from the noise source. The frequency of noise source used was 125, 250, 500, 1000, 2000, 4000 Hz. The measurement was performed at 95 cm to the nosie source by using sound level meter (SLM) SL 4112. The result showed that for a same thichness and variated measurement distance, the value of noise reduction was independent to the frequency. Noise reduction was getting smaller as increasing the thickness of the carpet. It’s value was maximum at the frequency of 2000 Hz and minimum at the frequency of 500 - 1000 Hz. The relation noise reduction to with frequency yielded a certain pattern, which was the larger carpet thichness the higher the nosie reduction would be. The lowest noise reduction was found at frequency of 500 - 1000 Hz, and the maximum noise reduction was accured at 2000 Hz.
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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Abstract

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
KARAKTERISASI BAHAN FERROELEKTRIK BARIUM STRONTIUM TITANAT (Ba0.3 Sr 0.7TiO3) DENGAN MENGGUNAKAN DIFRAKSI SINAR-X (XRD) Rahmad Efendi; Rahmi Dewi; Krisman '
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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Abstract

Ferroelectric materials of  Barium Strontium Titanate  (BST) with its  composition  of Ba0,3Sr0,7TiO3  was  succesfully deposited by a solid solution method. The samples were prepared in the form of pellets  and then  were annealed  at  the temperature of 600, 700, 800oC.   Characteritation of the samples was performed  using X-Ray diffraction (XRD). The results of characteritation using XRD was described on a graph  of the intensity  vs. 2 theta. The XRD  patterns of  Ba0,3Sr0,7TiO3  have  peaks. It was confirmed that the material of Ba0,3Sr0,7TiO3 has cubic crystalline structure, and its lattice parameter was  in average of 3,961 Å. The particle sizes (D) and lattice strains (η) of the material that was annealed at temperature of 600, 700, 800°C for 1 hour were 42.60, 44.43, 46.89 nm and -4,49x 10-3, -4,05 x 10-3,  -2,96 x 10-3, respectively. The increase in annealed temperature will raise the particle size and lattice strain.
Co-Authors Angeline Stefan Cahyo Budi Nugroho Debora M Sinaga Defrianto Defrianto Erwin ' Fauzan ' Fifi Puspita Juandi Juandi Rahmad Efendi Rahmi Dewi Riad Syech Ridho Ravita Wardy Rosdiawan Obby Novaldy Septina Sari Subehan ' Sukemi Indra Saputra Usman Malik Yugo Setiawan Zuhdi '