Antonius Surbakti
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ANALISIS ELASTISITAS BATU BATA YANG DIBUAT DENGAN TEKNIK PEMANAS TENAGA SURYA MENGGUNAKAN REFLEKTOR CERMIN CEKUNG Yani, Anda; Edisar, Muhammad; Surbakti, Antonius
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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The research has been conducted to investigate the quality of some bricks. The quality of the bricks was tested after heating by solar energy using concave mirror reflector on their elastic properties. The quality of the bricks after being heated was compared with the bricks that were prepared by conventional way (by heating using fire). The elasticity properties were calculated from the time propagation of the seismic wave in the bricks. The results of the research showed that the elasticity of the bricks heated using solar energy for 80 hours was 50.623 (N/m²), and the lowest elasticity heated for 10 hours was 16.530 (N/m). While the elasticity of bricks heated using fire with the distance of 0.7 meters was 72.199 (N/m²) and the lowest elasticity of bricks with the distance from fire of 0.76 meter was 32.555 (N / m²). The results also showed that the quality of the bricks was better through direct burning using fire compared to the one prepared by solar energy.
KONVERSI ENERGI CAHAYA MATAHARI MENJADI ENERGI LISTRIK MENGGUNAKAN DIODA SILIKON 6A10 MIC Wulandari, Retno; Ginting, Maksi; Surbakti, Antonius
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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A study has been done on Solar Energy Conversion Into Electrical Energy Using Silicon Diode 6A10 MIC in order to determine electrical energy of diode by varying number of diode that used with and without convex lens. This study used an experimental method that comparing the energy generated from the series and paralel diodes circuits with and without lens, then measuring the intensity of the sunshine by using a simple pylheliometer. Current, voltage, and temperature measurements were performed every 20 minutes from 10:00 to 13:00 during 7 days of observation. In the series and parallel circuits using convex lens produced higher energy than those without convex lens, because of more intensity of solar energy absorbed for the circuit with convex lens. The highest energy obtained from the circuit with convex lens were produced by the series circuits of 10 diodes, with was 30,31x10-2 Joule at 13.00 pm, whereas the highest energy for the circuits without the lens was 14.42 w-2 Joule.
Analisa Karakteristik Alat Pemanas Air dengan menggunakan Kolektor Palung Parabola Tambunan, Walfred; Ginting, Maksi; Surbakti, Antonius
Komunikasi Fisika Indonesia Vol 12, No 10 (2015)
Publisher : Komunikasi Fisika Indonesia

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Telah dilakukan penelitian analisa karakteristik alat pemanas air dengan menggunakan kolektor palung parabola. Penelitian dilakukan dengan cara menempatkan kolektor palungan ditempat terbuka dimana sinar matahari jatuh secara langsungkemudiandengan menggunakan pipa aluminium air dialirkan sepanjang garis fokus kolektor palungan lalu setiap 60 menit air yang telah melewati kolektor palungan ditampung dan diamati temperaturnya. Hasil yang diperoleh menunjukkan bahwa temperatur kolektor tertingi rata-rata adalah 50,03 OC dengan temperatur rata-rata air pada bak penampung sebesar 40,070C pada pukul 13.00 WIB sedangkan temperatur kolektor terendah rata-rata adalah 39,140C dengan temperatur rata-rata air pada bak penampung sebesar 35,28 0C pada saat pukul 10.00. Temperatur air tertinggi rata-rata pada pukul 13.00 WIB inidisebabkan karena pada waktu tersebut intensitas radiasi matahari mencapai harga maksimum. Laju kalor yang hilang secara konduksi tertinggi rata-rata 29,05 J/s pada pukul 13.00 WIB sedangkan laju kalor yang hilang secara konduksi terendah rata-rata sebesar 16,85 J/s pada pukul 10.00 WIB. Volume air yang dihasilkan rata-rata sebanyak 38 liter dalam sehari selama 6 jam dari pukul 09.00 WIB sampai pikul 15.00 WIB. Hasil eksperimen secara keseluruhan menunjukkan karakteristik alat pemanas air dengan menggunakan kolektor bentuk palungan ini mempunyai sifat bahwa semangkin tinggi intensitas radiasi matahari yang jatuh pada permukaan kolektor semangkin tinggi pula temperatur air yang dipanaskan. Kata kunci: pemanas air, kolektor palungan, energi matahari
PENGARUH PENAMBAHAN FRIT GELAS TERHADAP KARAKTERISTIKDIELEKTRIK KAPASITOR KERAMIK FILM TEBAL BATIO3 Tambunan, Walfred; Surbakti, Antonius; Syarif, Dani Gustaman
Komunikasi Fisika Indonesia Vol 13, No 13 (2016)
Publisher : Universitas Riau

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Thick film dielectric ceramic capacitors have been manufacture with an additive mixture ofBaTiO3 95 % : 5 % , 92.5 % : 7.5 % and 90 % : 10 % regarding the frits glass weight. Themixedsamples to the forms of pasta by adding 20%organic compounds heaviness. Formedpasta from the three types of samples sintered at a temperature of 700 C for 20 minutes.Then the characteristics of the sample by using XRD, SEM and LCR metersis done. XRDresults identified that all three types of samples formed BaTiO3 phase with a tetragonalcrystal structure that the length of the crystal grid is a = b ≠ c and angles α = β = γ . Theresults of SEM analysis showed BaTiO3 thick film microstructure changes by indicated theincrease in grain. Dielectric characteristics by measuring the capacitance of a capacitor attemperature of 30C - 100C. The results turned be a thick film capacitors with 5% fritcomposition has a dielectric constant of 230.75, 7.5% frit composition has a dielectricconstant of 39.58% and 10% frit composition has dielectric constant of 293.87% attemperature of 100C. These three dielectric constantvalues indicated 10% frit composition isthe highest dielectric constant of the capacitor and is the best of the three types of capacitor .
PEMBUATAN DAN PENGUJIAN ALAT PENGERING SURYATIPE KABINET BERPENUTUP MIRING MENGGUNAKANKACA DAN PLASTIK TRANSPARAN Ginting, Maksi; Surbakti, Antonius
Komunikasi Fisika Indonesia Vol 13, No 13 (2016)
Publisher : Universitas Riau

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A Solar dryer has been designed, constructed, and tested to dry casava and raw banana slicedwith 2 mm thickness. The dryer was equipped with a cabinet type collector to amplify heat forthe drying chamber. The collector cover was made in angle and using plastic and transparentglass sheets. The drying chamber was also equipped with an aluminium ventilator to let airflowing from the collector sides to the chamber. Data collection was performed from 9.00 a.m to13.00 p.m with one hour interval for three days. The research results showed that the averagemass of the dried banana and casava resulted when using glass and plastic cover, respectively,were 138.93 gr and 163.26 gr. The average dried masses for banana and casava samples whendried using only plastic cover were 146.13 gr and 173.06 gr. As comparison the dried masses forbanana and cassava resulted using a conventional method were 167.33 gr and 185.23 grrespectively for all of each measurement the masses of wet banana and casava were made thesame is 500 gr.
KAJIAN SPEKTROSKOPI TERAHERTZ JARINGAN TUMOR DENGAN PENDEKATAN KOMPUTASI BIOFISIK Krisman, Krisman; Surbakti, Antonius; Mawarlina, Mawarlina; Hamdi, Muhammad
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

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A study of terahertz apsorption spectroscopy has been done in the study of wave fatterns andabsorption spectra through biological tissue with a biophysical computational approach. Thedetermination of thr patterns of terahertz radiation waves and spectra of terahertz radiationabsorbtion into tissues of assessed theoretically by computational medhods. Determination ofphysical parameters of radiation absorbtion spectroscopy as well as fourier-assistedtransformation of mathematical software aplication 9. This section is called terahertzradiation absorption spectroscopy of cow tissue. From the result of computation or modelobtained amplitude spectrum of tissue absorbtion of normal 15 a.u tumors and cancer 12.5 a.ushow the difference. Terahertz radiation wave pattern dating the cow’s tissue medium,indicating that there are part are reflected and absorbed and scattered. However, in this studyonly emphasizes the part of absorbtion which then becomes a transmitted part. This result isalso compared with the result of previuosresearch as a validation resulted in 0.8% error.Differences in wave fatterns and absorption spectra between normal tissue and tumor orcancer are caused by the ingredients of the components containing the water making up thetumor or cancer more viscous than the normal tissue.
PENENTUAN KONSENTRASI GLUKOSA DAN INSULIN DARAH NORMAL DENGAN METODE SIMULINK Hamdi, Muhammad; Surbakti, Antonius; Salomo, Salomo; Isroyani, Isroyani
Komunikasi Fisika Indonesia Vol 14, No 2 (2017)
Publisher : Universitas Riau

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A study was conducted with the aim of comparing normal glucose concentrations between modelingresults and the experimental results of 6 normal glucose patients. The patterns of graphs produced ineach of the normal glucose patients vary although each patient is treated equally. The results showedthat the modeling is suitable for experimental data in 17-20 year old women who obtained staticglucose concentration of 73 mg / dl. It can be seen that there are several values of transport rateconstant (K) of the same curve fitting value, that is, on glucose flux (Fg) 80000 mg/dl.s parameter,transport rate of first order (K1) 24.7 s-1, Renal elimination transport rate (K2) 72 s-1, transport rate ofinsulin-glucose (K3) reduction 13,9 s-1, pancreas metabolism transport rate constant (K4) 14,3 s-1.The existence of several parameters that have the same value between modeling and also thisexperiment means that the patient in maintaining the balance of blood plasma glucose in the samedaily, blood plasma glucose is balanced when the efficient pancreatic and kidney organs.
VISUALISASI POTENSIAL LISTRIK DI ANTARA DUA PLAT SEJAJAR BERHINGGA DENGAN PROGRAM KOMPUTER BERBASIS MATLAB Eviliony, Eviliony; Erwin, Erwin; Surbakti, Antonius
Komunikasi Fisika Indonesia Vol 15, No 1 (2018)
Publisher : Universitas Riau

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The calculation of electric potential between two parallel plates with finite size is difficult work, visualization of the issue comprehensively is needed. In this paper, visualization of electric potential between two parallel plates with finite size has been done by developing a MATLAB based computer program. The electric potential was calculated by solving two dimensional Laplace equation. There are two parts of the program that have been developed, the menu program and the main program. The menu program was provided to store the input data required in the calculation. While, the main program served toperform calculations and visualization of the electric potential. The visualization of the electric potential was shown in the mesh and contour graph. The results showed that the program is applicable for various sizes of plates, and the electric potential in each position can be calculated and visualized. However, the computer programs has some limitations, such as for perfoming calculations of electric potential. For plate width ( ) of  m, distance of plates ( ) of  m, and initial potential ( )of  Volt, the electric potential in coordinate (20,0.5) is not defined (NaN).
Komposit Karbon Aktif dari Bahan Serbuk Gergaji Kayu Karet dan Nanomagnetik Fe3O4 + PVDF Sebagai Bahan Penyerap Limbah Cair Berbasis Logam Berat Surbakti, Antonius; Sukendi, Sukendi; Taer, Erman
Dinamika Lingkungan Indonesia Vol 3, No 1 (2016)
Publisher : Universitas Riau

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Abstract: Research "of Activated Carbon Composite Materials from Rubber wood Sawdust and addition of Fe3O4 +PVDFNano-Magnetic for Liquid Waste Absorbent Materials based Heavy Metal". The study aims to measure the ability of activated carbon from rubber wood sawdust as an adsorbent of heavy metals such as Cu, Cd and Pb. This research was performed with colection and analizing data in the laboratory . The mixing process for carbon powder, nano-magnetic Fe3O4 and PVDF were use a ball-milling instrument for 2 hours. Samples were activated with KOH activating agent and followed by carbonization process at a temperature of 850 ° C. Results of the untreated samples for the liquid waste contain of Cu, Cd, and Pb with concentration of 15.2918 ppm, 5.5444 ppm and 84.9456 ppm, respectively. Once treated with rubber wood based activated carbon the maximum adsorption occurs in time immersion for 2 hours. The maximum adsorption concentration were as high as 7.8964 ppm (48.36%), 5.0067 ppm (9.69%) and 23.6320 ppm (72.17%) for Cu, Cd and Pb, respectively. The next absorption process were followed by combination of activated carbon and nano-magnetic Fe3O4, the result were 0.2592 ppm (98.30%), 4.5189 ppm (18.49%) and 1.1635 ppm (98.63%) for Cu, Cd and Pb. The maximum adsorption concentration after treated with a mixture of carbon powder and nano-magnetic Fe3O4 plus PVDF, for Cu was 0.2843 ppm (98.14%), Cd was 4.6650 ppm (15.86%) and Pb at 0.7574 ppm ( 99.10%). As a conclution can be found the increasing for the heavy metal absorption for every step experiments, and composite activated carbon, nano magnetic Fe3O4 and PVDF was the best asbsorption material for heavy metal ion in the liquid waste.