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Fithriyah N.H.,Muhammadiyah University of Jakarta | Erdawati,State University of Jakarta
Journal of Engineering Science and Technology | Year: 2015

An environmentally friendly process were employed to prepare samples of recycled paper, as well as the coating solution of chitosan nanoparticles and dispersion of Ca(OH)2 particles. The nanomaterial was tested for antibacterial and acidity neutralising functions to preserve the strength and colour of paper samples. The paper samples were then characterised for physical and morphological characteristics, as well as chemical and mechanical properties. At concentrations of 0.125 and 0.25 mg/L, the chitosan nanoparticles (23-62 nm) were observed to retard the propagation of E. Coli and S. Aureus bacteria up to 22 and 26 mm in diameter, respectively. This propagation was also hindered by an increase in acidity introduced by Ca(OH)2 nanoparticles. The grammage, firmness, and colour of coated paper samples were not significantly influenced by nanoparticles concentration or coating thickness due to the low mass-to-area ratio of coating. Nevertheless, the tear strengths and cracking resistance of coated paper were improved. Chitosan nanoparticles in the coating potentially functioned as a sizing agent by diffusing into the pores of paper fibres and increasing the interfibrillar bonding, while the nanoparticles of Ca(OH)2 apparently preserved the strength and colour of paper samples by neutralising the acidity and thus preventing microbiological attacks. © School of Engineering, Taylor’s University.


Endrini S.,YARSI University | Jaksa S.,Muhammadiyah University of Jakarta | Marsiati H.,YARSI University | Othman F.,University Putra Malaysia | Rahmat A.,University Putra Malaysia
Journal of Medicinal Plants Research | Year: 2011

The cola nut (Cola nitida) tree is native to West Africa. It has been naturalized to South America, Central America, the West Indies, Sri Lanka, and Malaysia. Related to cocoa, cola nut is the source of a stimulant, and contains the polyphenolic compounds (including catechin, epicatechin, tannins, and 'Kola red') and the methylxanthine alkaloids that also occur in coffee, cocoa, and tea. Previous study has been shown the potential anticarcinogenic effect of cola nut extract on human breast cancer cell lines, MCF-7.This study was conducted to determine their mechanism of action through the apoptotic cell approach. The effect of cola nut extract on the apoptotic cell of MCF7 cells was determined by flow cytometric analysis. MCF7 cells were treated with 60 and 80 μg/ml of cola nut extract for 24 h and subjected to FACS analysis. MCF7 cells treated with 60 μg/ml cola nut extract showed an increase of 6.55% in population of apoptotic cells with a concomitant decrease in the percentage of cells in the S and G2/M phase of cell cycle compared to DMSO-treated control cells. Similarly, MCF7 cells treated with 80 μg/ml cola nut extract showed an increase of 8.29% in population of apoptotic cells with a concomitant decrease in the percentage of cells in the S and G2/M phase of cell cycle compared to DMSO-treated control cells. This suggests that cola nut treatment induces apoptosis at 24 h. In conclusion, cola nut extract may induce apoptosis in MCF-7 cell lines. © 2011 Academic Journals.


Hendrawati T.Y.,Muhammadiyah University of Jakarta
Journal of Engineering Science and Technology | Year: 2015

Aloe vera powder was produced from gel of Aloe Chinensis Baker from Pontianak, Indonesia. The effect of drying air inlet temperature to produce Aloe vera powder from Aloe Chinensis Baker was studied. Gel of Aloe Chinensis Baker was crushed, evaporated, mixed with maltodextrin and dried in a Shimadzu counter current spray dryer.Dryingair inlettemperature in spray dryer was varied110°C, 120°C, 130°C and 140°C. The raw material was analysed such as proximate, amino acid, calcium, magnesium, phosphor, lead, sodium, potassium and mangan. The product, Aloe vera powder was analysed such as appearance, colour, water content, pH, density, microbiology and the result was compared with Aloe vera powered commercial from Terry Labs. The active compounds on Aloe vera powder was analysed using LC-MS. InLC-MSdetectedcompoundsin the form especiallyionsM+H, sothere areadditionalmolecules intoionsin theM+1.This method was applied to determine five compounds in evaporated Aloe vera gel, Aloe vera powder (with drying inlet air temperature 110°C, 120°C, 130°C, 1400C). Aloin A and B, aloenin (B), aloesin and chrysophanol could be detected in all of samples. Aloe-emodin could not be detected in all samples. Aloeresin A could be detected in evaporatedAloevera gel, Aloe vera powder (with drying inlet air temperature 110°C, 120°C). The result was shown that the optimum air drying air inlet temperature was 1200C to produce Aloe vera powder which all of phenolic compounds of Aloe verapowder can still be maintained.Some of quality parameters such as water content, pH, solubility, colour, appearance, and microbiology are compliance with the standard of available commercial product. © School of Engineering, Taylor’s University.


Gunawan R.,University of Indonesia | Yusivar F.,University of Indonesia | Yan B.,Muhammadiyah University of Jakarta
International Journal of Power Electronics and Drive Systems | Year: 2015

This paper discusses The Self Excitated Induction Generator (SEIG) by approaching the induction machine, physically and mathematically which then transformed from three-phase frame abc to two-axis frame, direct-axis and quadratur-axis. Based on the reactive power demand of the induction machine, capacitor mounted on the stator of the induction machine then does the physical and mathematical approach of the system to obtain a space state model. Under known relationships, magnetization reactance and magnetizing current is not linear, so do mathematical approach to the magnetization reactance and magnetization current characteristic curve to obtain the magnetization reactance equation used in the calculation. Obtained state space model and the magnetic reactance equation is simulated by using Runge Kutta method of fourth order. The equations of reactance, is simulated by first using the polynomial equation and second using the exponent equation, and then to compare those result between the polynomial and exponent equations. The load voltage at d axis and q axis using the polynomial lags 640µs to the exponent equation. The polynomial voltage magnitude is less than 0.6068Volt from the exponent voltage magnitude. © 2015 Institute of Advanced Engineering and Science. All rights reserved.


Ismiyati,Muhammadiyah University of Jakarta | Purnawan I.,Muhammadiyah University of Jakarta | Kadarisman M.,Muhammadiyah University of Jakarta
MATEC Web of Conferences | Year: 2016

Indonesian government efforts, particularly in the city of Depok, regarding decent and healthy environmental management in the waste sector have to be enhanced. This is a complex and diverse problems, even though the government has set into the form of Law (UU) Number 18 Year 2008 on Waste Management to build a strategic partnership of stakeholders in waste management. The Government has also issued Government Regulation of the Republic of Indonesia Number 81 Year 2012 on "Management of household waste and household-like waste". Further research is required on what extent that the implementation of waste management had been undertaken, as well as the necessity to study the methods of environmental insight in waste management. Waste management needs to be comprehensive and integrated from upstream to downstream, thus providing economic benefits, people healthiness and environmental safety. The purpose of this study is to analyze the effectiveness of environmental management based in Depok. This study uses qualitative design, which is to observe, understand and expose reality or empirical phenomena; hence the proper method used is descriptive method. Instrument to gather the data is completed by observation and in-depth interviews. The type of data required includes primary and secondary data. The informant is selected by purposive sampling, and data analysis is treated with triangulation technique. The results present that in the framework of the effectiveness of environmental management based trash in Depok showed that 1) Institutional Factor for Urban Waste Management of Depok has run properly, 2) Private partnership (commercial solution) to be involved in urban waste management in Depok is being explored, 3) Applicable technology in fostering a culture of 3R (reduce, reuse and recycle) on the entire community of Depok, has been done with the declaration of Depok Trash Care towards Trash Clean 2020 in March 2014. © Owned by the authors, published by EDP Sciences, 2016.


Gunawan R.,University of Indonesia | Yusivar F.,University of Indonesia | Yan B.,Muhammadiyah University of Jakarta
Journal of Theoretical and Applied Information Technology | Year: 2015

The Self Excitated Induction Generator (SEIG) is very popular now as a generated alternating power. In this research the induction machine is approached in the physically and mathematically approximated which then transformed from three-phase frame abc to two-axis frame dq using the Park and Clark transformation. Based on the reactive power demand and capacitor mounted on the stator of the induction machine then do the physical and mathematical approach of the system to obtain a state space model. Under known relationships, magnetization reactance and magnetizing current is not linear, so do mathematical approach to the magnetization reactance and magnetization currents characteristic curve to obtain the magnetic reactance equation used in the calculation. Obtained state space model and the magnetic reactance equation is simulated by using Runge Kutta method of fourth order in the exponent equation with correction factor. The influence of the stator current in q axis iqs, is very strong and the equation of this current is non power-invariant then, using take the stator current reference iqs refis (2/3) Ibase. The correction factor K4has done the magnetizing inductance Lmand also the output terminal voltage of SEIG more precision than before. © 2005 - 2015 JATIT & LLS. All rights reserved.


Sjaiful Alim E.,Muhammadiyah University of Jakarta
Workshop Proceedings of the 20th International Conference on Computers in Education, ICCE 2012 | Year: 2012

This paper is a research report concerning Computer-Assisted Language Learning (CALL), used as medium of teaching English; in terms of looking for significant correlation between the Students' attitude towards ICT with the students' learning achievements in English. This is a kind of experimental research; where the data processing was performed by using descriptive statistics that aimed to know; the mean, the median, the range, the standard deviation, the variance, the minimum and the maximum score, and the presentation of the data forms to show the frequency of distribution and in a histogram. Based on the calculation of the correlation score, the research variables have positive correlation and it can be said that there is quite strong and significant correlation with the significance level of 5% (Sig. < 0.05). It means that all the three hypotheses stated or presented in this study could be accepted.


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Laboratorium administrator | Selasa, 27 Januari 2015 - 13:42:10 WIB | dibaca: 5352 pembaca Laboratorium yang terdiri dari : Laboratorium Biomedik Laboratorium Anatomi Laboratorium Keterampilan Klinis Laboratorium Komputer Praktikum Farmakologi Praktikum Mikrobiologi Praktikum Histologi Praktikum Patologi Klinik Ruang Skill Labs CSL (Clinical Skill Lab) Ruang Skill Labs adalah ruang yang di gunakan untuk melatih kemampuan psikomotorik/tindakan medis dengan menggunakan alat peraga / manekin. Keterampilan klinik ini menyesuaikan pada modul blok sistem yang sendang diikuti ...


Fithriyah N.H.,Muhammadiyah University of Jakarta | Erdawati,National University of Indonesia
AIP Conference Proceedings | Year: 2014

Chitosan were selected as cellulose raw material to prepare coating solutions. The morphology, physical characteristics and chemical surface properties of the coatings are discussed in this paper. Different concentrations of chitosan (1-5% w/w) and deposited solution layer (0.5-1.00 μm) were used to obtain coated papers with thicknesses varying between 0.062-0.068 μm. The percentages of coating agent impregnated inside paper were also calculated from the apparent density of coated paper and the density of self-supported films prepared in the same conditions but deposited on an inert and smooth Plexiglass support. These percentages of impregnation ranged from 4.8 to 63.3% and increased as following: chitosan < chitosan nanoparticle. The resulting absorption rates indicated significant differences as a function of the nature of coating agent and confirmed results obtained for the percentage of impregnation. To explain differences in the behaviour of coating solutions, it was finally concluded that not only their viscosity must be taken into account but also their affinity toward paper. © 2014 AIP Publishing LLC.

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