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...

Surabaya has alluvial domination that causes high rise of implication. This research is to know the natural frequency of building and ground, the damping ratio and earth quake micro-zoning. We use FSR (Floor Spectral Ratio) and RDM (Random Decrement Method) method for building analysis, and HVSR (Horizontal...

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 morning and evening twilight brightness are important to probe the properties of the upper atmosphere. We conducted a short survey of broad band twilight sky brightness measurements by using a portable photometer with 5 second resolution, in five places with different elevations. The darkest zenith...

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...

The crystallographic properties and ferroelectric state of BZT multilayer films which deposited on Si (100) substrate was studied in this work. XRD pattern peaks show that BaZr0.1T0.9O3 and BaZr0.08Ti0.92O3 are found well-crystallized at 800oC for 3 hours corresponding to vary annealed temperature. The...

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 monitoring of human postural balance in bipedal standing is an important parameter in medicine, related to balance disorder. A Human Postural Balance Monitoring System in Bipedal Standing (HPBMSBS) consists of a 3- axis digital position sensor module, a Programmable System-on-Chip (PSoC) 4, and a PC-display....

Sound absorption performance of cavity backed perforated panel on respect to the influence of flexible perforated membrane insertion was investigated by using a laboratory experiment. A layer of perforated flexible membrane was fitted inside the cavity backed MPP and the sound absorption coefficient...

Sensitivity issue becomes a common problem on Electrical Impedance Tomography. One effort to overcome this issue is through inducing a magnetic field. It needs proper inducer coil configuration in order to produce a good reconstruction result. In this study, inducer coil configuration is obtained to...

Instrumentation system for testing of conductive concrete material using four-electrode method has been built. The system can measure material resistivity under the influence of voltage-injection variable, temperature changing in the characterization reactor, as well as the duration of the material characterization....

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....

Cavity sound pressure level is a very important measure when dealing with the design of resonator based power generating sound absorbers and sound diffusers. This paper presents results from experimental study of the performance of the second generation iARG-X2 power generating Helmholtz resonator. The...

We study the behavior of numerical entropy production of shallow water flows along channel by varying width. The topography is assumed to be horizontal, but the channel width can be in an arbitrary shape. The flows are governed by the system of shallow water equations. These equations are numerically...

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....

Accurate determination of blood urea concentration has gained a great clinical interest, especially for diagnosing kidney failure or lever malfunctioning. The biosensor can provide a fast response and accurate measurement about blood urea concentration. In this research, a method for fabrication of a...

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...

Earthquake phenomena can be observed and monitored using the presence of vibration. In order to monitor the vibration, fluxgate sensor can be applied based on magnetic flux change. In this research, a vibration measurement instrument based on the fluxgate sensor for an earthquake monitoring application...

Low Temperature Detection System on cow cement flask base on RTD-coil coupled by transducer 4-WCB has been made. Four kinds of sensor was prepared, that’s are coils from copper material with diameter 1 mm and set number of winding from 200 up to 500. Four-WCB circuit was chosen as transducer to facilitate...

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...

This article presents a new technique to detect a premature atrial contraction (PAC). The technique employs a hybrid of particle swarm optimization (PSO) and fuzzy inference system (FIS), and is called PSO-FIS. In the detection electrocardiographic features are used for the inputs of PSO-FIS. In PSO-FIS,...

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...

Classification is a machine learning technique that used widely for various applications. One of the classification algorithm is FNGLVQ that can be used to solve several types of classification problem in previous research. On the other side, Field Programmable Gate Array (FPGA) is an instrument currently...

Heart disease is the number one cause of death in the world according WHO data. One of the mayor cause is the lack of cardiologists. One of the proposed solution is tele-electrocardiograph (Tele-ECG) system. However, the sizeof ECG data recorded from patient is not small. Therefore, it must be compressed...

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....