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Ivandini Tribidasari A.
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Makara Journal of Science
Published by Universitas Indonesia
ISSN : 23391995     EISSN : 23560851     DOI : https://doi.org/10.7454/mss
Core Subject :
Makara Journal of Science publishes original research or theoretical papers, notes, and minireviews on new knowledge and research or research applications on current issues in basic sciences, namely: Material Sciences (including: physics, biology, and chemistry); Biochemistry, Genetics, and Molecular Biology (including: microbiology, physiology, ecology, taxonomy and evolution); and Biotechnology.
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Articles 880 Documents
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PENGGUNAAN METODE ANALISA EKOLOGI DAN PENGINDERAAN JAUH UNTUK PEMBANGUNAN SISTEM INFORMASI GEOGRAFIS EKOSISTEM PANTAI Sukojo, Bangun Muljo
Makara Journal of Science Vol. 7, No. 1
Publisher : UI Scholars Hub

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Abstract

Application of Remote Sensing and Ecology Analysis Method for Geographic Information System of Coastal Ecosystem. With the development that have been done on all Indonesian coastal area, the damaged can be suffered from day to day. The decrease of environmental or ecosystem quality occurred and effected the economic, social and cultural life directly or indirectly. Based on that condition, data or information is needed to look accurately the decrement level and the way to handle it. One method that can be used is a computer based technology which commonly called Geographic Information System (GIS). The technology can gathering, recording, processing and displaying data or information which is obtained directly or indirectly from the field. As the data to be said acceptable with high validity, then before it is being acknowledged, then an ecology analysis and remote sensing technology can be done first.
PENGARUH ANIL TERMAL TERHADAP BESARAN OPTIS LAPISAN TIPIS a-SiC:H HASIL METODE DC SPUTTERING I. TARGET SILIKON Saleh, Rosari; Munisa, Lusitra; Marianty, Dewi
Makara Journal of Science Vol. 7, No. 1
Publisher : UI Scholars Hub

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Abstract

The Effect of Thermal Annealing on the Optical Properties of a-SiC:H Films Produced by DC Sputtering Methods: I. Silicon Target Case. The effects of thermal annealing treatment on the optical properties of amorphous silicon carbon films deposited by silicon target in an argon, methane and hydrogen gas mixture have been studied using ultra violet-visible (uv-vis) spectroscopy. Both n and α, and consequently the real and imaginary parts of the dielectric constant, show a considerable variation with subsequent annealing up to annealing temperature 500 °C, with the most rapid changes occurring for temperature 300 °C. The films tend denser as the annealing temperature increased up to 500 °C. The optical gap improved slightly upon annealing, where as the disorder of the amorphous network reduced. The annealing treatment produces reorganization of the amorphous network since thermal annealing results in dissociation of hydrogenated bonds (Si-H and C-H).
PENGARUH ANIL TERMAL TERHADAP BESARAN OPTIS LAPISAN TIPIS a-SiC:H HASIL METODE DC SPUTTERING II. TARGET GRAFIT Saleh, Rosari; Munisa, Lusitra; Marianty, Dewi
Makara Journal of Science Vol. 7, No. 1
Publisher : UI Scholars Hub

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Abstract

The Effect of Thermal Annealing on the Optical Properties of a-SiC:H Films Produced by DC Sputtering Methods: I. Graphite Target Case. A study of the annealing effect on optical properties and disorder of hydrogenated amorphous silicon carbon (a-SiC:H) films was undertaken. The films were prepared by sputtering technique using graphite target and silicon wafer in argon and hydrogen gas mixture, and then characterized by uv-vis (ultra violet-visible) spectroscopy before and after annealing. Index of refraction n and absorption coefficient α of films have been determined from measurements of transmittance. The optical gap show small variation with annealing temperature, increasing with increasing annealing temperature up to 500 °C. An increase of annealing temperature leads to reduced film density and the amorphous network disorder. The experimental results are discussed in terms of deposition condition and compared to other experimental results.
PEMANFAATAN MALTODEKSTRIN DARI PATI SINGKONG SEBAGAI BAHAN PENYALUT LAPIS TIPIS TABLET Anwar, Effionora
Makara Journal of Science Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

The Use of Maltodextrin from Tapioca Starch as a Film Coating Tablet Material. Maltodexrin is a modifi ed starch product which can be use as a material fi lm coating tablet. The aim of the research was to study the capability of maltodextrin as a material fi lm coating exipient. Maltodextrin DE 5-10 was made by hidrolysis of tapioca starch with α-amylase enzyme from NOVO (Termamyl L120®), at 80° C, for 65 minute. Maltodextrin was used as a fi lm coating material at concentration 10%,15%,20% dan 25%. As a comparative fi lm coating material was used HPMC. The evaluation of the coating tablet was done accordance to Farmacope Indonesia third and fourth edition. The result show that maltodextrin DE 5-10 from tapioca starch can be used as fi lm coating at concentration 10-25% with concentration 10% gave better result a HPMC
PENGARUH PENINGKATAN FLOW RATE GAS METAN TERHADAP SIFAT OPTIS LAPISAN TIPIS AMORF SILIKON KARBON (a-SiC:H) HASIL DEPOSISI METODE DC SPUTTERING Munisa, Lusitra; Saleh, Rosari
Makara Journal of Science Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

Methane Flow Rate Effects On The Optical Properties of Amorphous Silicon Carbon (a-SiC:H) Films Deposited By DC Sputtering Methods. We have investigated the refractive index (n) and the optical absorption coeffi cient (α) from refl ection and transmission measurements on hydrogenated amorphous silicon carbon (a-SiC:H) fi lms. The a-SiC:H fi lms were prepared by dc sputtering method using silicon target in argon and methane gas mixtures. The refractive index (n) decreases as the methane fl ow rate increase. The optical absorption coeffi cient (α) shifts to higher energy with increasing methane fl ow rate. At higher methane fl ow rate, the fi lms tend to be more disorder and have wider optical gap. The relation of the optical properties and the disorder amorphous network with the compositional properties will be discussed.
PERBEDAAN PERLUASAN DAERAH TUTUPAN PADA WILAYAH PERMUKIMAN DI KOTAMADYA DEPOK Saraswati, Ratna
Makara Journal of Science Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

The Depok Land Use Planning predicts that in 2010, urban land use will be 73 percent, while 63 percent is for settlement. Depok is allocated for catchment area, so the expansion of paving area should be monitor. In this study, there were four types of settlement lower and middle type in perumnas and in middle type (perumnas kecil dan besar serta perumahan sederhana kecil dan besar). Average of paved area in the perumnas kecil was 66 m², in perumnas besar was 89.5 m². In perumahan sederhana kecil was 54.4 m² and in perumahan sederhana besar was 121.3 m². Land square meter and length of stay were the variables that infl uence the expansion of paved area. They did that because they have more space to expand their house, and now, there was no open space left
PENGGUNAAN ALGORITMA GENETIKA UNTUK OPTIMASI JARINGAN NEURAL BUATAN-FUZZY DAN APLIKASINYA PADA SISTEM PENCIUMAN ELEKTRONIK Kusumoputro, Kusumoputro; Irwanto, Ponix
Makara Journal of Science Vol. 6, No. 1
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Abstract

REAKSI PENATAAN ULANG SIGMATROPIK HIDROGEN [1,3] SECARA TERMAL DAN REAKSI PENATAAN ULANG PROTOTROPIK [1,3] YANG DIKATALISIS OLEH KATALIS TRANSFER FASE (PTC) , [18]-CROWN ETHER-6: SEMI-SINTESIS VANILI DARI EUGENOL* Suwarso, Wahyudi Priyono; Sukri, Tony; Wijaya, Hendra
Makara Journal of Science Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

Semi-synthesis of vanillin from eugenol can be divided into two step reactions namely, isomerization of eugenol into isoeugenol, and cleavage oxidation of isomerization product into expected reaction product (vanillin). In this work isomerization of eugenol or eugenyl acetate into isoeugenol or isoeugenyl acetate has been done via the following reactions: (1) Sigmatropic hydrogen (1,3) thermalic rearrangement reaction: direct heating of eugenol or eugenyl acetate at 220o C for 8 hours can produce 52.2% of isoeugenol or 65.7% of isoeugenyl acetate (both chemical yields are measured by means nmr-spectrometer), where products are viscose yellow-brownish liquid as mixture of unseparated starting material and isomerization product. (2) Prototropic (1,3) rearrangement catalyzed by phase transfer catalyst (PTC): (18)-crown ether-6 at room temperature can be afforded 71.4% of isoeugenol as light yellow liquid (mixture of unseparated starting material and isomerization product). Without any separation of mixture between isomerization product and starting material followed by subsequent cleavage oxidation using KMnO4 as oxidator in neutral condition catalyzed by phase transfer catalyst: (18)- crown ether-6 at room temperature for 3 hours can be yielded 16.5-22.9% of vanillin (from the starting material; eugenol or eugenyl acetate). The spectroscopical data of synthetical vanillin is not rather different with the spectroscopical data of authentical natural vanillin
STUDI SPEKTROSKOPI ELECTRON SPIN RESONANCE (ESR) LAPISAN TIPIS AMORF SILIKON KARBON (a-SiC:H) HASIL DEPOSISI METODE DC SPUTTERING Rosari, Rosari
Makara Journal of Science Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

The dangling bond defect density in sputtered amorphous silicon carbon alloys have been studied by electron spin resonance (ESR). The results show that the spin density decreased slightly with increasing methane fl ow rate (CH4 ). The infl uence of carbon and hydrogen incorporation on g-value revealed that for CH4 fl ow rate up to 8 sccm, the ESR signal is dominated by defects characteristic of a-Si:H fi lms and for CH4 fl ow rate higher than 8 sccm the g-value decreased towards those usually found in a-C:H fi lms. Infrared (IR) results suggest that as CH4 fl ow rate increases more carbon and hydrogen is incorporated into the fi lms to form Si-H, Si-C and C-H bonds. A direct relation between the IR results and the defect density and g-value is observed
STUDI HIDROLOGI HUTAN KOTA KAMPUS UNIVERSITAS INDONESIA DEPO Kusratmoko, E; Tambunan, M. P.; Sobirin, Sobirin
Makara Journal of Science Vol. 6, No. 1
Publisher : UI Scholars Hub

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Abstract

Hydrological Study on the urban forest in Campus Area of the Indonesia University, Depok during September 2000 – February 2001 hydrological measurement of urban forest in Campus Area of the Indonesia University, Depok were carried out to identify the effect of land cover on the runoff generation processes. Seven observation station which are characteristised by differenced land cover were build to measure overland and sub surface fl ow. The result of data analysis showed that the grass and litter cover in urban forest fl oor played an important role as a control factor of overland fl ow and throughfl ow production, especially signifi cant during the convective rains. During this events the proportion of throughfall on this area which produced overland fl ow, varied between 5,3-7,2%, while on the area without the grass and litter cover, its about 12,5-18,9%. During December–February the overland fl ow was very high. This is probably closely related to the existence of the widespread saturation overland fl ow. Generally it was shown a very close relationship between throughfall and overlandfl ow on the area without the grass and litter cover. The effect of antecedent precipitation index on the overland and throughfl ow production was identifi ed on the location with grass cover and cultivated area and particularly signifi cant on the events with throughfall >40 mm.

Page 60 of 88 | Total Record : 880

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