Time filter

Source Type

Yogyakarta, Indonesia

The Islamic University of Indonesia is a private university located in Yogyakarta, Indonesia. It was established in 27 Rajab 1364 or in 8 July 1945 as STI by political figures of the day including Dr. Muhammad Hatta, Mohammad Natsir, Mohammad Roem, Wachid Hasyim as well as Abdul Kahar Mudzakir. STI developed into a university called Universitas Islam Indonesia on 14 December 1947. Historically, UII is the first national university in Indonesia, and it is also the oldest private university in the country.The university is located in Sleman, Daerah Istimewa Yogyakarta. Wikipedia.

A group of English as Foreign Language (EFL) students who participated in this study were found to be poor in comprehending spoken English and felt unconfident to practice their spoken English because of their lack of active vocabulary knowledge. This study discussed the challenge of activating their oral vocabulary using the technology called Native-Speaker Video Clips with Subtitle (NSVCS). The students chose their own sub-topics freely and practiced them using the Self Regulated Learning (SRL) strategies in the period of 16 weeks focusing on 6 main topics, namely: Islam, Animal, Human, Sport, Agriculture and Economics. Improvement in fluency, understanding, pronunciation, stressing, and intonation was analysed based on their Classroom Performance (CP) records using tape script, which was only done on one medium achievement sample with the beginning, the middle and the last topics.The findings showed that the students adjusted their tongues to the new vocabulary very well and were able to improve their overall fluency, understanding, pronunciation, stressing, and intonation gradually. © 2015 American Scientific Publishers. Source

Fatimah I.,Islamic University of Indonesia
Journal of Materials and Environmental Science | Year: 2012

Titania pillared montmorillonite from Indonesian montmorillonite by using titanium isopropoxide as precursor was successfully prepared. Physico-chemical character of material by using x-ray diffraction, gas sorption analyzer, diffuse reflectance UV-Visible, scanning electron microscope (SEM) and energy dispersive x-ray (EDAX) showed the dipersion of titania in dominantly anatase phase that is theoretically active as photocatalyst. The photoactivity was evaluated in methylene blue photodegradation and Eschericia coli inactivation. The kinetics of metylene blue photodegradation indicate the significant role of prepared material as photocatalyst as well as in E. coli inactivation. Photodegradation of methylene blue over prepared material shows the fitness to Langmuir-Hinshelwood model. Source

Allwar A.,Islamic University of Indonesia
International Journal of Applied Chemistry | Year: 2016

Activated carbon was prepared from oil palm shell for removal of iron and copper from the patchouli oil. It was designed by pyrolysis at 900°C under nitrogen and continued under carbon dioxide. The result was refluxed into 10 M nitrite acid. The N2isotherm exhibits Type I corresponding to the micropores structure. The BET surface area, Langmuir surface area, micropore volume, total pore volume and average pore size distribution were 325.40 m2/g, 491.60 m2/g, 0.17 cc/g, 0.19 cc/g and 11.45 Å, respectively. The functional group was determined by FTIR spectroscopy and Boehm titration, and it shows an increasing of oxygen functional groups from 0,04meq/g to 0,19meq/g. The activated carbon showed a higher adsorptive capacity for removal iron compared to copper in patchouli oil. © Research India Publications. Source

Purnamirza T.,University of Technology Malaysia | Purnamirza T.,Islamic University of Indonesia | Rahman T.A.,University of Technology Malaysia
Journal of Electromagnetic Waves and Applications | Year: 2012

A novel technique in simplifying the fabrication process of LP-RLSA antenna as well as improving the reflection coefficient of LP-RLSA antenna is proposed in this paper. This technique utilizes a FR4 board added on the top of the normal LP-RLSA antenna. Theoretically, FR4 dielectric material is able to reduce antenna reflection coefficient since it produces the signal that has a different phase with the propagating signal within the antenna cavity. Moreover, by utilizing the copper part of the FR4 board as the radiating element, the fabrication process can be simplified since the antenna slots can be cut utilizing the simple low cost etching process. In this paper, the theory about how the utilization of the FR4 board can improve the reflection coefficient response is explained. The parameters that influence the capability of FR4 board in improving the reflection coefficient response are also discussed. A LP-RLSA antenna with FR4 board and a LP-RLSA antenna without FR4 board are designed and simulated at frequency of 5.8 GHz. The simulation result shows that the thickness and permittivity values of FR4 board influence the reflection coefficient response and the antenna gain. The best values of the permittivity and thickness of the FR4 board are 4.3 and 1.6, respectively. The simulation result shows that these values can improve antenna gain up to 2.45 dB. They can also improve reflection coefficient response significantly from -3 dB to -25 dB. It is discovered that the LP-RLSA with FR4 board also produces the beamsquint effect from -10° up to 10° from the boresight direction. The prototype of the designed antennas is fabricated and measured. The measurement and simulation results show that the LP-RLSA with FR4 board has a better gain and better reflection coefficient than the LP-RLSA without FR4 board, thus prove the concept of the novel technique. Source

Rahmillah F.I.,Islamic University of Indonesia
IOP Conference Series: Materials Science and Engineering | Year: 2016

The working environment is one factor that has contribution to the worker's performance, especially for continuous and monotonous works. L9 Taguchi design experiment for inner array is used to design the experiment which was carried out in laboratory whereas L4 is for outer array. Four control variables with three levels of each are used to get the optimal combination of working environment setting. Four responses are also measured to know the effect of four control factors. Results shown that by using ANOVA, the effect of illumination, temperature, and instrumental music to the number of ouput, number of error, and rating perceived discomfort is significant with the total variance explained of 54,67%, 60,67%, and 75,22% respectively. By using VIKOR method, it yields the optimal combination of experiment 66 with the setting condition of A3-B2-C1-D3. The illumination is 325-350 lux, temperature is 240-260C, fast category of instrumental music, and 70-80 dB for intensity of the music being played. Source

Discover hidden collaborations