In this paper, the optimum thermo-acoustic stack position was investigated. Two types of parallel-plate stacks made of celluloid negative film and ABS materials were selected and investigation was carried out over three working frequencies. The ABS stack revealed that the farther of the stack position...

This paper discusses in situ measurements of the speech intelligibility of classrooms in a private university in Jakarta. Seven classrooms with and without stepping students seating area are evaluated. Impulse Response method is used to measure the acoustics condition of the classrooms. Their speech...

Modification of chitosan by p-t-butylcalix[4]arenes has been conducted using a nucleophilic subtitution reaction between chitosan, p-t-butylcalix[4]arenes and N,N-diisopropyl carbodiimide (DIC) in reagent dichlorometane at room temperature and under nitrogen atmosphere. Analysis structure of the chitosan-p-t-butylcalix[4]arenes...

The measurement of internal residual strain on the elastic, yield and plastic pre-strained of SS400 during welding had been performed using neutron diffraction technique. SS400 steel has been welded using gas metal arc welding (GMAW) in pre-strained condition of 0%, 1%, 3%, and 5%. This paper will present...

Absorption bandwidth of conventional Micro-Perforated Panel backed by air cavity is limited around 1 octave bands particularly for pore diameter close to 1 mm. Compared with porous material, the absorption bandwidth is relatively narrow. Hence, its applications may become limited. This research shows...

Gas sensor was needed to detect and the presence of gas, either for toxic gas or non toxic gas. The one of the important part in gas sensor instrument are the metal oxide. There are some ways to make metal oxide for sensing material of gas sensor; the one is sol-gel process. The purpose of this experiment...

A thin film of PPIA synthesized from polycondensation reaction of itaconic acid (IA) and 1,3-propanediol (PDO) with spin coating method has been made. To develop the film property, various glycerols (gly) were added during reaction to form PPIA film with 10%, 30%, 50%, and 70% of the total weight of...

The aim of this research is to simulate the transmittance of fluorine doped tin oxide (FTO) for dye sensitized solar cell (DSSC) application. Simulation was performed using finite difference time domain (FDTD) method based on Maxwell equation for flat and nano cone periodically surface textured of FTO....

A research on caustic fusion method of zircon concentrate has been conducted with applied single and double steps of leaching and filtration. The aims of research are to produce zirconia, ZrO2, with high purity, to study its crystal structure and cell parameters and also comparing the results of single,...

This study evaluates the manufacturing process of microfibrillated cellulose (MFC) reinforced PLA nanocomposites using a semi-crystalline grade of polylactic acid (PLA). The objective of this study was to obtain uniform dispersion of MFC in a PLA compound of semi-crystalline grade of PLA. The nanocomposites...

The aim of investigation was to analyze geometrical effects of frame on vehicle handling. Analysis had been done on prototype of three wheels vehicle. The prototype was designed using revolute joint frame to gain better vehicle handling. Revolute joint frame on the vehicle prototype could be set up into...

In this study, we propose a method for preparation of hybrid polymer solar cell sub-module, which is achieved by internally series-interconnection of 3 (three) single hybrid polymer solar cells based on MDMO-PPV and ZnO blend on a flexible substrate. The structure of the device was ITO/PEDOT-PSS/ZnO:MDMO-PPV/Ag....

The performance of dye-sensitized solar cells (DSC) is affected by its components such as photoelectrode material, dye-sensitized, electrolyte, substrate and counter electrode materials. In this study, we investigated the effect the addition of larger TiO2 particle as a scattering layer to the TiO2 nanoparticle....

A non wovenpolycarbosilane (PCS) fibers was successfully produced by electrospinning and processed by a thermal curing and electron beam curing. PCS solution composition was 1.2 g/ml PCS with 30% N,N-dimethylformamide (DMF)/70%toluene and the applied voltage at 10 kV in spinning process. The PCS fibers...

Initial studies have been conducted to study the properties of calcium carbonate (CaCO3) from a wide range of poultry such as domestic chicken eggshell, Chicken Broiler egg shell, duck egg shell and quail egg shell. This initial study was conducted to determine whether the initial identification of a...

Pure and Y-doped BiFeO3 have been synthesized by sol–gel method. the gel have been heated at 150°C for 3 h, the low-temperature heating treatment was given to obtain uniform, homogenous, and smaller size. The crystal BiFeO3 have been found after dried and grounded followed by calcination at 750°C for...

The effect of temperature and relative humidity on the d-spacing of montmorillonite (MMT) clay in Poly(ethylene glycol) Mw 600 (PEG600) nanocomposites prepared by solution casting has been investigated, since it can be significantly affected by any associated water. X-ray diffraction (XRD) traces were...

The aim of this research is study of Electrohydrodynamic (EHD) flow by discharge corona generator with electrodes configuration of Pin- Dual Ring Concentric. We measured the velocity of EHD flow with electrodes configuration of Pin- Dual Ring Concentric and compare the result to Pin-Single Ring electrodes....

Characterization of organic solar cells based organic material and polymer using natural chlorophyll and P3HT have been investigated using current-voltage (I-V) Keithley 2602 instrument. Chlorophyll is extracted from Spirulina sp by column chromatography method. It is found that the absorbance spectra...

Welding process is generally used in manufacturing industry. It usually produces distortions in the weld metal. To reduce distortion, one of the methods used is the pre-strain. This study aims to determine the effect of pre-strain during welding process on the residual strain of dissmilar metal weld...

Synthesizing of indium oxide (In2O3) nano particles using sol-gel process as an active sensing material of gas sensor has been carried out. As starting material, indium acetate/In(CH3COO)3 was dissolved in diethylene glycol and heated up at 1300C until homogeneity is achieved. Nitric acid (HNO3) was...

The effect of magnetic fields on the swelling of liquid crystal elastomers (LCE) dissolved in liquid crystal (LC) solvent have been studied. The Flory-Huggins model used to calculate the free energy of an isotropic mixing and the Maier-Saupe model used to calculate the free energy of a nematic mixing....