Browsing by Author "Krisman"
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Item ANALISA DAN PENENTUAN REDAMAN KABEL SERAT OPTIK YANG DIGUNAKAN DALAM SISTEM TELEKOMUNIKASI PADA PT. CHEVRON PACIFIC INDONESIA(2013-07-23) Sitinjak, Tumbur Marudut Tua; Krisman; SalomoThe research on analysis and determination of attenuation of optical fiber cables used in telecommunication system at PT. Chevron Pacific Indonesia has been done. Optical fiber that is used is a single mode step index type G.652. Transmitting light in the optical fiber is damped that is physically caused by absorption, losses on optical fiber, switching losses and connector losses and other physical damage. Network testing was done at wavelengths of λ=1310 nm and λ=1550 nm on 6 tracks. OTDR (Optical Time Domain Reflectometer) M200 series and the transmitter network of transmitting optical signals were used for measurement. The method used in this measurement is budget link, in order to measure the performance of communication system of the optical fiber cables as a result of attenuation that occurs along the cable. From measure result by OTDR M200 got highest attenuation is in the IT Tower link to ACME Office at a distance of 1,2 km, with a total attenuation value of 11.5 dB. Attenuation was caused by the lack of impurities of optical fibers and the process of splicing. On the Rangau link to Pelita MS there are 10 cores dropped from 18 cores are available. As for the other cores were in under normal circumstances of that is below the standard (International Telecomunication Union) No. T-REC-G-199802-1 is 0.35 dB/km for wavelength 1310 nm and 0.25 dB/Km for 1550 nm, indicating that of all the links that have been built have good performance and under normal circumstances so that it can be used to operate.Item ANALISA PENGARUH KOMPOSISI TERHADAP MIKROSTRUKTUR BAHAN FERROELEKTRIK BARIUM STRONTIUM TITANAT DENGAN MENGGUNAKAN SCANNING ELECTRON MICROSCOPY(2016-02-01) Purnami, Ni Wayan Enik; Dewi, Rahmi; KrismanThe sample of material BST shaped pellets has been conducted experimently by blending material BaCO3, SrCO3 and TiO2 with comparison of composition Ba0.7Sr0.3TiO3, Ba0.8Sr0.2TiO3 and Ba0.9Sr0.1TiO3 as many as three sample. Each sample was annealed with temperature at 700oC for 60 minutes and then characterized using Scanning Electron Microscopy (SEM) in order to identify grain size and density of the sample. The results showed that the physical form of microstructure BST material that is shaped approaching circular size with various grain size and density. Material Ba0.7Sr0.3TiO3, Ba0.8Sr0.2TiO3 and Ba0.9Sr0.1 annealed at temperature 700oC for 60 minutes have an average grain size of each 263,15 nm, 238,09 nm and 208,83 nm and density of particle is 4.36%, 4,53% and 4,77% respectively. Then the increment of Strontium caused grain size is bigger and density is smaller.Item KARAKTERISASI BAHAN FEROELEKTRIK STRONTIUM TITANAT (SrTiO3) DENGAN MENGGUNAKAN X- RAY DIFFRACTION(2013-03-05) Susilawati; Dewi, Rahmi; KrismanFerroelectric material Strontium Carbonate (SrCO3) has been made with the comparison of 1:1 from chemical reaction of Titanium Dioxide (TiO2). The pellet was anneled with the temperature of 700oC and then characterized using XRD. The XRD result of SrTiO3 after anneling showed some peaks, the positions of the peaks on 2θ are 23.32°, 32.72°, 40.00o, 47.07o, 52.40°, 57.80o. After anneling, the peaks become wider, this mean the samples become crystaline in structure. From the “a” value calculation “a” mean value obtained is 3,86 Å. Once the value of a calculated and a reference value obtained percentage error can be calculated that is 1.15%Item Karakterisasi I-V Tanah dan Mikrostruktur Feroelektrik Material BaTiO3(2013-04-17) Nanda Setiadi, Rahmondia; Dewi, Rahmi; KrismanTanah adalah suatu benda alami yang terdapat di permukaan kulit bumi yang tersusun dari bahan mineral sebagai hasil pelapukan bebatuan dan bahan organik sisa-sisa tanaman dan hewan. Tanah sangat berperan penting dalam pertumbuhan tanaman, oleh karena itu semua makhluk di bumi sangat tergantung pada tanah. Tanah perlu dijaga kondisi dan keseimbangan kandungan nutrisinya. Penurunan produktivitas tanah dapat terjadi karena adanya faktorfaktor yang dapat menurunkan tingkat produktivitas tersebut, diantaranya adalah erosi yang terus-menerus dapat mengakibatkan terkikisnya lapisan tanah yang subur, bencana alam, sistem ladang berpindah, dan Iain-lain. Tanah memiliki fungsi yang sangat vital dalam penyediaan bahan pangan bagi manusia dan juga bagi makluk hidup lainnya. Fungsi-fungsi tersebut membawa konsekuensi bahwa tanah sebagai pelindung tanaman dari serangan hama penyakit dan dampak negatif pestisida maupun limbah industri berbahaya.Item KARAKTERISASI MIKROSTRUKTUR FEROELEKTRIK MATERIAL SrTiO3 DENGAN MENGGUNAKAN SCANNING ELECTRON MICROSCOPY (SEM)(2013-07-19) Anuwar, Kaspul; Dewi, Rahmi; KrismanThe carbon pellets from material SrCO3 and TiO3 had been made using chemical reaction method with composition 1:1. The pellet was annealed with temperature 700C by time variation 30 minutes, 60 minutes, and 90 minutes. The characterization was done by using Scanning Electron Microscopy (SEM). The result from SEM varied over 30 minutes has an average grain size 228,05 nm. The variation of 60 minutes has an average grain size 247,05 nm . The variation of 90 minutes has average grain size 286,75 nm. SEM characterization of SrTiO3 showed that the longer annealing time is required, the greater result granules is obtained.Item KARAKTERISASI SIFAT OPTIK BAHAN BARIUM TITANAT (BaTiO3) DENGAN MENGUNAKAN SPEKTROSKOPI ULTRAVIOLET-VISIBLE (UV-Vis)(2013-07-11) Yulis, R.; Krisman; Dewi, R.The characterization of BaTiO3 by using the method of experiment and comparison of 1: 1 is reported. This research uses chemicals with different concentrations i.e 0.005 mole, 0.006 mole 0.007 mole, and different temperatures i.e 600oC, 700oC, 800oC. The purpose of this research is to obtain the absorbance (spectrums) of BaTiO3 with temperature and concentration variations, then the characterization is done using UV-Vis spectroscopy method. The research results shows that at concentrations 0,005 mole, 0,006 mole, 0,007 mole before annealing of each having a wavelength 282,0 nm, 284,0 nm, 273,0 nm gives absorbance at 3,999 a.u, and at concentrations 0,005 mole, 0,006 mole, 0,007 mole after annealing at a temperature of 600 C, 700 C, 800 C, having a wavelength each 281,0 nm, 284,0 nm, 279,0 nm gives absorbansi 3,1503 a.u.Item KARAKTERISASI SIFAT OPTIK BAHAN STRONTIUM TITANAT (SrTiO3) DENGAN MENGGUNAKAN SPEKTROSKOPI ULTRAVIOLET-VISIBLE (UV-Vis)(2013-07-11) Sayuti, Mirwan; Krisman; Dewi, RahmiThe investigation of SrTiO3 solution preparation by using of chemical reaction method has been done. The chemicals used are Strontium Carbonate (SrCO3) and Titanium Dioxide (TiO2), with the concentrations of each sample are 0,005 moles, 0,006 moles, and 0,007 moles, and the temperature differences are 600 oC, 700 oC, and 800 oC respectively. The number of samples made are six. The optical properties of SrTiO3 are investigated solution using some UV-Vis spectroscopy method. The results obtained from this study are some absorbance spectrums. The concentration 0,005 moles, 0,006 moles, and the concentration 0,007 moles before annealing at wavelength of 285 nm, 281 nm, and 282 nm have the same absorbance intensity which is 3,999 a.u. After annealing by a concentration 0,005 moles on a temperature of 600 oC, a concentration 0,006 moles on a temperature of 700 oC, and a concentration 0,007 moles on a temperature of 800 oC at wavelength of 279 nm, 277 nm and 279 nm turned out to have the same intensity of absorbance which is 3,150 a.u. So, the intensity of the absorbance materials before annealing is smaller than those materials after annealing.Item PEMBUATAN DAN KARAKTERISASI FILM TIPIS BARIUM STRONSIUM TITANAT(2016-02-01) Mulyadi, Rendi; Dewi, Rahmi; KrismanFabrication and characterization of Barium Strontium Titanate are studied to determine the electrical properties, the complex capacitance and relative dielectric constant of the material by annealing Ba0.8Sr0.2TiO3 at 600ºC and 650ºC. Samples are made by using the sol-gel method. Characterization of the samples uses Scanning Electron Microscope (SEM) and Impedance Spectroscopy. Results of SEM for samples 600ºC and 650ºC have thickness of 198 nm and 208 nm respectively. Results of impedance spectroscopy can determine the value of the complex capacitance and relative dielectric constant. The complex capacitance value at temperature of 600ºC is 0.0011 Farad and at temperature of 650ºC is 0.0013 Farad. The value of the relative dielectric constant at temperatures of 600ºC and 650ºC are 2.519 and 3.091 respectivelyItem PEMBUATAN FILM TIPIS BARIUM STRONTIUM TITANAT (BST) MENGGUNAKAN METODE SOL-GEL YANG DIKARAKTERISASI DENGAN SPEKTROSKOPI IMPEDANSI(2016-02-01) Elvionita, Wilia; Dewi, Rahmi; KrismanThis paper investigates a thin film Barium Strontium Titanate (BST) with compositions of Ba0,9Sr0,1TiO3, Ba0,8Sr0,2TiO3 and Ba0,7Sr0,3TiO3 by using sol-gel method that has been annealing at a temperature of 7000C in order to describe a crystalline structure. BST thin film of three compositions was characterized by using Field Emission Scanning Microscopy (FESEM) and Impedance Spectroscopy. The characterization results the thickness of thin film Ba0,9Sr0,1TiO3, Ba0,8Sr0,2TiO3 and Ba0,7Sr0,3TiO3 were respectively 97,69 nm; 44,74 nm and 15,79 nm. The impedance spectroscopy measured a frequency, real impedance (Z’) and imaginer impedance (Z”). The analysis results of real impedance and imaginer impedance showed the area between the contact and the sample (interface). The capacitance value of the BST thin film with compositions of Ba0,9Sr0,1TiO3, Ba0,8Sr0,2TiO3 and Ba0,7Sr0,3TiO3 at 1 Hz, was respectively 3,1 x 10-8 F/m; 2,57 x 10-8 F/m and 2,26 x 10-8 F/m. The dielectric constant value of the BST thin film with compositions Ba0,9Sr0,1TiO3, Ba0,8Sr0,2TiO3 and Ba0,7Sr0,3TiO3 at 1 Hz, was respectively 3,4 x 10-2; 1,3 x 10-2 and 4,03 x 10-3.Item PENENTUAN TINGKAT REDUKSI KEBISINGAN OLEH PAGAR BUATAN DI SEKITAR BANGUNAN RUMAH PENDUDUK DI KOTA PEKANBARU(2016-02-01) Asti, Maya; Juandi; KrismanA has been conducted research on noise reduction using artificial fence on houses Measured noise levels were generated by vehicles passing through which is on the cipta karya street and suka karya street in pekanbaru. Distance sound level meter to the noise source the road was set to be the same. The measurements using two sound level meter were performed in 9 different points. The results showed that a home with fencereceived less noise than that of home without fence. If has been seen that the artificial fences could reduce the noise generated by vehicles. The noise without barrier at suka karya street was 66,897 dBA to 70,980 dBA and a was 60,482 dBA to 64,464 dBA far the home with fence to the north-south direction. The noise of home without barrier in cipta karya street was 59,995 dBA to 65,548 dBA with barrier in cipta karya street was 56,800 dBA to was 59,809 dBA to the north-southItem PENGARUH SUHU ANNEALING TERHADAP MIKROSTRUKTUR BAHAN BARIUM TITANAT (BaTiO3) MENGGUNAKAN SCANNING ELECTRON MICROSCOPY (SEM)(2013-07-19) Zulpratama, D.; Krisman; Dewi, R.The samples material BaTiO3 with pellet shape have been made using experiment method of blending materials BaCO3 and TiO2 with the comparison of 1:1 as many as three samples. Each sample was annealed with the different temperature of 600, 700, and 800 C and then characterized using Scanning Electron Microscopy (SEM) in order to identify grain size and composition of the sample. The results of the characterization of SEM showed the physical form of microstructure BaTiO3 material that is shaped approaching dominant round with a different size and density. There are pores between grains of the particles, from measurement result EDX also obtained the composition of substances in samples. Material samples BaTiO3 which were annealed at the temperature of 600, 700, and 800 C have an average grain size of each is 94.34 nm, 108.7 nm, dan 131.58 nm respectively. It can be concluded that by increasing a high annealing temperature, BaTiO3 grain size will be larger.Item Pengaruh Temperatur Dan Waktu Anil Terhadap Perubahan Sifat Mekanik Dan Tekstur Pada Lembaran Plat Baja(2015-03-16) KrismanTelah dilakukan laku panas ahil pada lembaran kerja baja kaibon sangat rendah (ultra low carbon) dari tingkat reduksi dingin berbeda, yaitu 77% (ketebalan ± 0,6 mm) dan 73% (ketebalan ± 0,7 mm) dengan memvariasikan temperatur anil. Temperatur anil yang divariasikan, yaitu : 600, 650, 700, 750, 800 dan 850 °C dan waktu tahan tetap yaitu 10 jam. Pacta lembaran baja 77% reduksi dingin juga dilakukan anil dengan waktu tahan yang divariasikan, yaitu 1,4,7 dan 10 jam, sedangkan temperatur anil tetap yaitu 700°C. Ilasil penclitian menunjukkan adanya penurunan kekerasan dan kekuatan pada kedua jenis lembaran baja serta peningkatan keuletan, dengan bertambahnya temperatur anil dan waktu tahan. Sifat mampu bentuk yang ditentukan dari harga koefisien pengcrasan regang (n) mengalami peningkatan dengan bertambahnya temperatur anil dan waktu tahan. Kliusus sifat mampu bentuk yang ditentukan oleli harga r juga meningkat dengan bertambahnya temperatur anil dan waktu tahan, telapi pada kondisi anil dimana temperatur anil 850°C dan waktu tahan 10 jam harga r turun.Item PENGUKURAN KOEFISIEN ABSORPSI BUNYI DARI LIMBAH BATANG KELAPA SAWIT(2013-03-05) Sinaga, Debora M; Krisman; DefriantoThe measurement of the sound absorption coefficient of oil palm stem has been conducted. A stem of oil palm which is used in this research was processed into square boards with size of 23 cm x 23 cm as a test sample. The sample then was cut into 4 pieces which has the same size but the thickness is varied, i.e 3 mm, 6 mm, 9 mm and 15 mm. Measurement of the sound absorption coefficient of the samples was done using impedance tube method made of acrylic. The generated frequencies used were 125 Hz, 250 Hz, 500 Hz, 1000 Hz and 2000 Hz. The highest sound absorption coefficient obtained from this research is 1.175 mm-1 at 2000 Hz frequency. Meanwhile, the smallest sound absorption coefficient is 0.157 mm-1 at 125 Hz frequency. The sound absorption coefficient of the samples at low frequencies (125-500 Hz) is quite small compared to high frequency. The sound absorption coefficient of samples increases as the frequency is increased. The result of research at 125-500 Hz frequencies showed that the sound absorption coefficient of samples depends on the sample thickness. The sound absorption coefficient increases as the thickness of sample is increased.Item PENGUKURAN TINGKAT PENYERAPAN BUNYI KEPINGAN BATANG KELAPA SAWIT DENGAN MENGGUNAKAN TABUNG IMPEDANSI(2014-03-26) Sari, Septina; Erwin; KrismanResearch on measuring of levels of sound absorption by a piece of palm trunk was done. Sample of palm trunk used in this study was 22 years old and made into rectangular 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 sweep function generator. The sound intensity inside the impedance tube before and after penetrating the sample was recorded using sound level meter. The sound frequency range 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, the intensity of the sound was reduced very significantly after penetrating the sample inside the tube. For high frequency, namely 1000 Hz then the percentage of sound absorbtion by 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 percentage of sound absorbtion by the material with the thickness of 6 mm, 9 mm and 15 mm was 5.6 %, 8.3 % and 12 % respectivelyItem Perbaikan Proses Pembelajaran Mata Kuliah Gelombang Di Jurusan Fisika Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Riau(2015-03-06) KrismanTelah dilakukan perbaikan proses pembelajaran mata kuliah gelombang di jurusan Fisika FMIFA UNRI dengan menggunakan metode pengajaran fisika interaktif dan visualisasi komputer. Dengan metode ini mahasiswa dapat melihat visualisasi bagaimana suatu fenomena fisika berubah di dalam ruang dan waktu, dan mereka juga dapat secara interaktif mengubah parameter dari peristiwa fisika tersebut, sehinga akan memotivasi mereka untuk lebih memahami lebili jauh materi yang diberikan. Evaluasi akliir dari proses perbaikan pembelajaran gelombang ini menunjukkan adanya peningkatan nilai rata-rata yang diperoleh mahasiswa relatif terhadap nilai rata-rata pada tahun ajaran sebelumnya (1999/2000). Pengujian untuk membuktikan sifnifikansi kenaikkannya dilakukan dengan uji t pada tingkat keyakinan 0,95Item SIFAT OPTIK DARI FILM TIPIS BARIUM STRONSIUM TITANAT MENGGUNAKAN KARAKTERISASI SPEKTROSKOPI ULTRAVIOLET- VISIBLE(2016-02-01) Hidayati, Taufiq; Dewi, Rahmi; KrismanFabrication ofBSTthin film on the substrateglasswas successfully by usingsol-gel method. The purpose of this researchis toobtainoptical energyband gapvalue(absorbance, transmittance, refractive index, thin film, andfilmcoefficients) by using Taucplotmethodwithvariouscompositions and temperatures. The optical properties of thin film were characterized by usingUltraviolet-Visible Spectrophotometerwitha thinfilm ofBa1-xSrxTiO3wherethe value of x=0,4: 0,5: 0,6at temperatures of650ºC. The wideenergy band gapopticalthin filmBa0,6Sr0,4TiO3is theintervalfor 2.0eV, for Ba0,5Sr0,5TiO3is in the rangeof1.55eVandfor Ba0,4Sr0,6TiO3is in the range of 2.0eV.