Development of Automatic Torque Bond Test

Proper bonding between adjacent pavement layers is very important to ensure good pavement performance. Manual torque bond test is known to be one of the tests to determine mechanical properties of bond between adjacent pavement layers. However, the test has several drawbacks that may affect the accuracy of results. This paper is focused on the development a mechanically controlled automatic torque bond test in order to eradicate the drawbacks associated with the manual torque bond test. A trial test and calibration of the newlydeveloped apparatus was performed to ensure the accuracy of results. The nominal loading rate of the manual torque bond test performed at 600Nm/min was found to be lower than the target loading rate, leading to a lower measured shear strength compared to that of the automatic torque test. It was also found that the appearance of lateral shear would not significantly affect the shear strength

Pengaruh Perubahan Arus Listrik Terhadap Penurunan Kadar Lemak Dan Minyak Dalam Air Limbah Melalui Proses Elektrokoagulasi

Based on the Regulation of the Minister of Health of Indonesia No.907/Menkes/SK/VII/2002 mentioned that the security environment for maximum content of heavy metals in waste water are: 0.03 mg / l for copper (Cu), 0.2 mg / l for aluminum (Al), 0.3 mg / l for iron (Fe), 0.1 mg / l for manganese (Mn), 0-200 mg / l for calcium (Ca), 0-150 mg / l for magnesium (Mg ), 200 mg / l for sodium (Na) and 0.5 mg / l for potassium (K) and zero for organic materials.If the content of organic materials in excess of such provision, then the water must be processed to meet the recommended requirements. One way that has been applied in this research is electrocoagulation method. The electrocoagulation process is to remove organic material (liquid), which is one source of odor in water. The research carried out by flowing water of 4.5 liters of industrial waste into the tank electrocoagulation process. The process is run with an electric current 0.05, 0.1 and 0.2 amperes with intervals of 20 minutes for observation data. Analysis of the organic matter content carried out by gravimetry. The residual oil and fat is 0.06 mg/l at 100 minutes and current 0.1 ampere. Based on the results of these studies was the content oils and fats in waste water has met the standard of the Minister of Health of Indonesia. Key words: Organic Pollutants,Electrocoagulation Process, Reduction of Pollutan

Perbandingan Pengukuran Pdd Dan Beam Profile Antara Detektor Ionisasi Chamber Dan Gafchromic Film Pada Lapangan 10 X 10 Cm2

The Comparison of PDD and beam profile measurements between detectors Ionization Chamber and Gafchromic film on 10x10 cm2 field. has been done Measurements were made with the detector CC-13s with a volume of 0.13 cc as a reference detector. Measurements were performed using IBA RFA phantom dosimeter. while the film measurement using solid water phantom gafchromic done. Measurements were taken at a field size of 10x10 cm2 in plane 6 MV linac with energy. Profile measurements performed using the SAD technique, with a depth of 10 cm for 6 MV. While the PDD measurements using SSD technique. From the results of this study are expected to know the PDD curve Beam profile and optimal dose measurement accuracy can be achieved in clinical treatment. well as the advantages and disadvantages of each detector and can be taken into consideration in selecting the optimal dosimeter according to the function that will be used

Pengaruh Temperatur Sintering terhadap Sifat Optik Lapisan Tipis Zinc Oxide (Zno) yang Dideposisi Diatas Substrat Kaca dan Aplikasinya untuk Mendegradasi Pewarna Methylene Blue

In this research, ZnO thin films have been successfully deposited on glass substrates by spraycoatingtechniquewith avariety the sintering temperature of 300 °C , 400 °C , 450 °C and 550 °C. Optical properties ZnO thin films were characterized by using UV-Vis spectroscopy. The ability ofphotocatalyst of ZnOfordegradation ofmethylene bluecolorwas observedthrough the absorbance test by using UV-Vis to obtain the percentage of color degradation. The results showed that the sintering temperature of ZnO affects the value of energy Gap of ZnO thin film. Higher sintering temperature resulted in higher energy gap. The largest gap energy generated from the ZnO sintering temperature of 450 ˚ Cwith values Eg 3.03 eV. ZnO photocatalyst activity of test results have been able to degrade methylene blue up to 97.62% were obtained from ZnO thin layer of sintering temperature of 450 ˚ C

Analisis Sifat Optik Lapisan Tipis Bilayer Zno/tio2 yang Dideposisikan Menggunakan Metode Sol-gel Spray Coating dan Aplikasinya sebagai Fotodegradasi Zat Warna

ZnO/TiO2 bilayer thin films have been deposited on a glass substrate by using sol-gel method with spin coating technique. The quality of films deposited on buffer layer is found to be superior to those grown directly on a substrate. The ability of photodegradation of ZnO/TiO2 was observed through the dye test by various molarities of ZnO solution. ZnO sol was prepared by dissolving zinc acetate dehydrate into a solvent of isopropanol then add monoethanolamine and stirred for 30 min at 70°C. For preparing TiO2 sol, titanium tetraisopropoxide is first dissolved in a mixture containing isopropanol and ethanol at room temperature. Then after 30 min stirring, the sol was titrated with a mixture of acetic acid, ethanol and deionized water. The process was followed by 60 min at room temperature. ZnO sol as a first layer is first deposited on a glass substrate and then proceed TiO2 sol on it, for the both deposition was heated at 450oC. The optical properties of ZnO/TiO2 bilayer thin films was characterized by using spectrophotometer UV-Vis. The results showed that the molarity of the ZnO sol affects the optical properties of ZnO/TiO2 bilayer thin films. The band gap energy of the ZnO/TiO2 bilayer thin films with different molarity of ZnO sol respectively 0,1 M, 0,3 M, 0,5 M and 0,7 M has been measured about 3,21 eV, 3,27 eV, 3,32 eV and 3,36 eV. The results of the photodegradation test of the ZnO/TiO2 bilayer thin films have been able degrade methylene blue up to 99,85%, methyl orange 50,68% and batik's dye 49,87%