Prima University of Indonesia

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Medan, Indonesia
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Abdullah H.,National Taiwan University of Science and Technology | Abdullah H.,Prima University of Indonesia | Gultom N.S.,National Taiwan University of Science and Technology | Kuo D.-H.,National Taiwan University of Science and Technology
Journal of Materials Science | Year: 2017

Indium oxysulfide nanosheet (In2(O,S)3 NS) had been successfully synthesized by a solution-based process at 90 °C. To further study some properties of photocatalyst, the 90 °C-prepared In2(O,S)3 NS was annealed at 350, 400, and 450 °C in air for 2 h. It was found that the nanosheet structure at 90 °C changed to nanoparticle at higher temperature. All the as-prepared and annealed photocatalysts were carefully characterized and examined toward photocatalytic hexavalent chromium (Cr(VI)) reduction. Among the photocatalysts, 90 °C-prepared In2(O,S)3 NS exhibited the greatest photocatalytic reduction of Cr(VI) without using any hole scavenger reagent under 150 W visible light illumination. After the Ag deposition on In2(O,S)3 NS, the photocatalyst could produce nearly 400 μmol/g hydrogen gas in ethanol solution under 150 W Xe-lamp irradiation for 5 h. The great performance of 90 °C-prepared In2(O,S)3 NS was due to the high surface area of nanosheet morphology and the formation of solid solution which significantly increased the visible light absorbance. The photocatalytic activities and their mechanisms of 90 °C-prepared In2(O,S)3 NS were evaluated and elaborated in this work. © 2017 Springer Science+Business Media New York


Tanjung A.F.,Prima University of Indonesia | Thien F.-T.,University Malaysia Sarawak | Puah C.-H.,University Malaysia Sarawak | Brahmana R.K.,University Malaysia Sarawak | Sianturi R.H.,Prima University of Indonesia
Advanced Science Letters | Year: 2017

Indonesia is Malaysia’s second tourist generating country after Singapore, therefore it is important to look at the macroeconomic determinants of Indonesia tourism demand in Malaysia in order to maintain and sustain the significant Indonesian tourist inflows into Malaysia. This study employed quarterly data from 2000Q1 to 2014Q4 to estimate Indonesian tourism demand with the explanatory variables of real income, travel cost and exchange rate. The empirical findings suggest that there is a long-run equilibrium relationship between Indonesian tourism demand and the specified determinants. In summary, higher Indonesian real income, higher travel cost and stronger Indonesian currency will encourage more Indonesian visitors visiting Malaysia. © 2017 American Scientific Publishers All rights reserved.


Sianturi R.H.,Prima University of Indonesia | Tanjung A.F.,Prima University of Indonesia | Leong C.-M.,Technology College Sarawak | Puah C.-H.,University Malaysia Sarawak | Brahmana R.K.,University Malaysia Sarawak
Advanced Science Letters | Year: 2017

Money demand function that turns out to be unstable due to the financial liberalization has affected the effectiveness of monetary policy that utilizes monetary targeting as policy target. Thus, Divisia monetary aggregate that is consistent with the economic theory has been used to examine the money demand function in Indonesia. Monetization is also included as a determinant of money demand to measure the financial deepening. A stable M2 money demand has been identified via the use of Divisia M2 money and the inclusion of monetization variable. Monetary targeting can serve as alternative policy target for Indonesia and there is a possibility for a return to monetary targeting in Indonesia. © 2017 American Scientific Publishers All rights reserved.


Adrian,Prima University of Indonesia | Fachrial E.,Prima University of Indonesia | Almahdy,Andalas University | Syaifullah,Andalas University | And 2 more authors.
Journal of Chemical and Pharmaceutical Research | Year: 2015

In this study, the ability of cassava (Manihot utilissima) leaves for Cd (II) removal was investigated. The effects of pH, biosorbent dosage, contact time, initial Cd (II) concentrations were also studied. The result showed that the adsorption process was strongly dependent on initial concentration and biosorbent dosage. The optimum pH value was 6, contact time 90 minutes, initial concentration 500 mg/L and biosorbent dosage was 0.1 g. The biosorption data were fitted to Langmuir isotherm with R2 = 0.9945. The spectroscopy analyses showed that the functional groups of –OH, C=O and –C=C- might be involved in adsorption. The Cd (II) ion concentrations were determined by the use of Atomic Absorption Spectroscopy (AAS). The analysis of biosorbent surface before and after adsorption was confirmed by the use of Scanning Electron Microscope (SEM). It was concluded that Manihot utilissima leaves could potentially used as a biosorbent for Cd(II) in aqueous solution. © 2015 Journal of Chemical and Pharmaceutical Research. All rightes reserved.


Samin B.,Prima University of Indonesia | Fachrial E.,Prima University of Indonesia | Almahdy,Andalas University | Munaf E.,Andalas University | And 3 more authors.
Journal of Chemical and Pharmaceutical Research | Year: 2015

Biosorption of Cu (II) ions from aqueous solutions onto soursop (Annona muricata L) leaves powder was investigated in a batch system. Several variables such as effect of pH, contact time, concentration of metal ions and biosorbent dosage have been investigated. The result showed that the adsorption process was strongly dependent with pH and initial concentration of Cu (II). The optimum condition was achieved for adsorption on pH 7 and initial concentration of Cu (II) was 500 mg/L with sorption capacity 6.14 mg/g. The optimum adsorption was also achieved with biosorbent dosage 0.25 g and contact time 90 minutes. The experimental equilibrium biosorption data were analyzed by Langmuir isotherm model with R2 = 0.9689. Furthermore, the biosorbent was characterized by Fourier Transform Infra Red (FT-IR) spectroscopy to identify the various functional groups contributing in the sorption process. Scanning Electron Microscope (SEM) was used for surface analysis before and after adsorption process. © 2015, Journal of Chemical and Pharmaceutical Research. All rights reserved.


Turnip A.,Indonesian Institute of Sciences | Soetraprawata D.,Indonesian Institute of Sciences | Turnip M.,Prima University of Indonesia | Joelianto E.,Bandung Institute of Technology
Internetworking Indonesia Journal | Year: 2016

The paper considers a non-invasive brain computer interface uses EEG-SSVEP signals over visual cortex to control electronic wheelchair movement (i.e., forward, backward, left, and right). The main goal of the paper is to help people with severe motor disabilities (i.e., spinal cord injuries) and to provide them with a new way of communication and control options. In this paper, offline analysis of the data collected is used to make the user able of controlling the movement of the electronic wheelchair. The data are collected during a session in which four subjects with age about 25±1 years were tested. The adaptive-network based fuzzy inference system algorithm is then applied for the classification method with some parameters. In the offline analysis, the implemented method shows a significant performance in the classification accuracy level and it gives an accuracy level of more than 90%. This result suggests that using the adaptive-network based fuzzy inference system algorithm can improve real time operation of the current BCI system. © 2016 IIJ.


Sitinjak R.R.,Prima University of Indonesia | Pandiangan D.,Sam Ratulangi University
Agrivita | Year: 2014

The aim of this study was to evaluate the effect of plant growth regulator triacontanol to the growth of cacao seedings (Theobroma cacao L.). A completely randomized design was applied using non-factorial pattern on the treatment triacontanol growing regulator substance to level: 0.0 ml/L, 0.1 ml/L, 0.5 ml/L, 1.0 ml/L and 2.0 ml/L replicated 5 times. The result shows that the given of tria-contanol significantly affected the growth of cacao seedings at the age of 14 weeks. The best tria-contanol concentration was 1.0 ml/L, which was effectively able to increase the growth of cacao seedlings; high seedlings, number of leaves, lenght of leaves, and diameter of stems respectively reached 26.21%; 3.70%; 42.28%; and 10.42% higher than the control. Plant growth regulator triacontanol was efective to increase the growth of cacao seedlings. © 2014, Agriculture Faculty Brawijaya University. All rights reserved.


to compare the anti-malarial effect among sambiloto extract, chloroquine and artemisinin-only as well as those of their combination. the study was conducted in Central Biomedical Laboratory, Faculty of Medicine, Brawijaya University, Malang, Indonesia from January to February 2006. Malaria culture used Plasmodium falciparum of Papua strain (2300) that was obtained from Namru-2 Jakarta. Five drugs applied in this test; those were chloroquine, artemisinin, the extract of sambiloto, the combination of sambiloto and chloroquine, and the combination of sambiloto and artemisinin. Parasite density was determined by counting the number of Plasmodium falciparum infected erythrocyte in 5,000 erythrocytes of the culture. Single drug (Chloroquine-only or artemisinin only) and either combination with sambiloto at dose 0.5 ug/ml had killing-effect against the parasite, measured by the appearance of "crisis form" on the infected erythrocytes. This killing-effect was dose dependent, and reached its optimum effect of 200 ug/ml. treatment of single sambiloto extract with dose 0.5 ug/ml increased the density of the parasite, however after every 1ug increasing dose of sambiloto extract, the killing effect also increased. The reduction of the parasite density was also seen by increasing the Sambiloto dose in the group of combination of sambiloto-chloroquine as well as the group of combination of sambiloto and artemisinin. Statistically, there was no difference in the anti-malaria efficacy among of five test drugs (p=1.00). The correlation between the reduction of the parasite with the increasing of dose in all groups is statistically significance (p=0.001). the extract of sambiloto in a single dose or in a combination evidently has the effect of anti-falciparum malaria.


Karo-Karo U.,Prima University of Indonesia
International Journal of Pharmacy and Technology | Year: 2016

Noninfectious desease became a problem in health which must be solved seriously. The risk general factor that noninfectious desease was hypertension, high blood sugar, unnormal fat embolism and obesity. Hypertension becomes interested desease caused it caused of death. The number of the persons who have hypertension was rising from year to year. It was caused of factors. There were low potash, high natrium, les nutrition, commonly consumme animal grease, stress, smoking, and less excercising. It used quantitative research. It has been Done since March until April 2015. The object of research was police. It used systematic sampling. The collecting data was done with questioners and to measure blood pressure was done by nurses. The research finding was shown that 28% of smoking persons had high hypertension, vise versa the lowest smoking persons shown that 36.6% normal. Responden who had floaty activity was 26.8%. Medium with normal blood pressure was 32.9%. The conclusion of this research was there were relationship between smoking persons and ecercising activity with hypertension. To solve the problem above was the pearsons must be done more execises than smoking. © 2016, International Journal of Pharmacy and Technology. All rights reserved.


Sitinjak R.R.,Prima University of Indonesia
Journal of Chemical and Pharmaceutical Research | Year: 2016

The aim of this research was to evaluate the somatic embryo of meristem culture of ginger (Zingiber officinale Rosc.) through morphological analysis. This research used descriptive methode. Friable embryogenic callus, obtained from meristem culture, was cultured on proliferation medium. Cultured tissue fragments containing several globular embryoids were observed by microscopy to follow development of ginger embryoids. Based at morphology analysis, at first week it grew into somatic embryo. Somatic embryo that rise from embriogenic cells were another contach via a route spesific. The somatic embryo formed was consist of an apical region, a basal region and a suspensor region. On the fourth week, however, the morphology of somatic embryo was founded on the shape of globular. It’s consist of an apical region and a basal region. © 2016, Journal of Chemical and Pharmaceutical Research. All rights reserved.

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