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INDONESIA
Indonesian Journal of Science and Technology
Published by Universitas Pendidikan Indonesia
ISSN : 25278045     EISSN : 25281410     DOI : -
Core Subject : Science, Social,
Computer Science & IT Environmental Science
Arjuna Subject : -
Articles 220 Documents
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Modification of Kaolin with Carbon Quantum Dots as Composite for Methylene Blue Removal: Literature Review and Experiment Nonni Soraya Sambudi; Yuvan Sithambaran; Khee Chung Hui; Muhammad Wahyu Nugraha; Norashikin Ahmad Kamal; Noorfidza Yub Harun; Suriati Sufian
Indonesian Journal of Science and Technology Vol 7, No 2 (2022): IJOST: VOLUME 7, ISSUE 2, September 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i2.50810

Abstract

The modification of kaolin with nano-size fillers has exhibited excellent performance in the adsorption process. Carbon quantum dots (CQDs) are the new generation of nanoparticles that have attracted interest for their utilization as modifiers. In this study, a composite of metakaolin(MK)/CQDs was synthesized and tested for methylene blue (MB) removal. The heating and acid-alkali treatment of kaolin transformed it into MK. The interaction between MK and CQDs was analyzed using XPS to detect the binding of pyridic NH2 and C-N. By loading CQDs into the kaolin matrix, the surface area was improved and the removal of MB increased. For a lower MB concentration at 5 ppm, the removal efficiency could reach 96%. The composite exhibited good regeneration through the recyclability test.
Sensitivity of Junction Width to Tidal Nonlinearity on Small and Shallow Tidal Junction Faruq Khadami; Kiyosi Kawanisi; Mohamad Basel Al Sawaf; Gillang Noor Nugrahaning Gusti
Indonesian Journal of Science and Technology Vol 7, No 2 (2022): IJOST: VOLUME 7, ISSUE 2, September 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i2.49856

Abstract

Observations of water elevation in the short and small tidal junctions of the Ota River, Japan, showed an increase in tidal nonlinearity at the apex of the junction. To quantitatively estimate the increase in nonlinearity, the barotropic hydrodynamic model was applied in an idealized junction domain, inspired by the Ota River Estuary junction. Even though the model was simplified, it successfully reproduced the increase in nonlinearity at the junction apex. A sensitivity analysis of tidal nonlinearity to the width of the upstream channel at the junction was performed by varying the upstream channel width from the same width as the branch channel width to three times the branch channel width. The relationship between the upstream channel width at the apex and tidal nonlinearity was not linear. Tidal nonlinearity was maximized when the apex width was twice the branch channel width. The convergence of the tides in the small width junction induced an increase of some positions of quarter-diurnal tidal constituent that raised the tidal nonlinearity. In the case of a wider channel, the flushing from river runoff dampen the tidal constituents, making it decrease tidal nonlinearity
Literature Review and Experiment: Diversity of Bacteria in Forest, Revegetated Post-Mining Land, and Active Tin Mining with A Metagenomic Approach Eka Sari; Andhika Puspito Nugroho; Endah Retnaningrum; Irfan Dwidya Prijambada
Indonesian Journal of Science and Technology Vol 8, No 1 (2023): IJOST: April 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i1.51662

Abstract

The objective of this study was to investigate the diversity of bacteria in the rhizosphere of Acacia grow in the forest and different ages of revegetated land and non-rhizospheric bacteria from active tin mining soil on Bangka Island with a metagenomic approach and to investigate its relationship with physicochemical properties of the soil and its metal content. 17 species/genera were found in the four fields, and Bradyrhizobium is the dominant genus. Bacterial communities of the forest (more than 5 years in revegetated post-tin mining land containing C, N, P, and Fe) are Paraburkholderia sp., Bacillus sp., Candidatus-Xiphinematobacter, and Bacterium enrichment. The physicochemical properties of soil from less than 5 years of revegetated contain Cu, Cr, and Mo, and the dominant species in this soil were Bulkhorderia sp., Bacillus lehensis, B. fordii, B. thermolactis, Chloroflexi bacterium, and Thermonosporaceae bacterium. The physicochemical properties of soil from the mining were dominated by Cd and Ni, and the dominant species in this soil were Sinomonas atrocyanea.
Dye-Doped Fe3O4 Nanoparticles for Magnetically Controlling Random Laser Parameters at Visible Wavelengths: Literature Review and Experiment M. S. Al-Samak; J. M. Jassim
Indonesian Journal of Science and Technology Vol 7, No 3 (2022): IJOST: VOLUME 7, ISSUE 3, December 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i3.51453

Abstract

The development of light-controlled electronic devices requires new possibilities of optical control via tuning of laser input parameters. Here, Fe3O4 superparamagnetic nanoparticles (SNPs) were doped with dye, and the controllability of parameters of a random laser, including the wavelength, threshold energy, and intensity under the absence and presence of an external magnetic field was studied. The prepared dye laser (Rh-640) showed strong magnetic controllability and switch ability under different pumping energies (1‒7 mJ), as well as good responsivity and durability at visible wavelengths. The applied magnetic field was utilized to modify the distribution of Fe3O4 SNPs with different concentrations and scattering behavior, altering the generation of coherent loops and laser action properties. Thus, it was possible to employ the magnetically controllable random laser in a variety of technological applications, including biology and optical communications
Effects of Moisture Content and Grain Type on Mechanical Properties of White Rice: Literature review and Experiment Nursigit Bintoro; Alya Iqlima Zahra
Indonesian Journal of Science and Technology Vol 7, No 2 (2022): IJOST: VOLUME 7, ISSUE 2, September 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i2.50887

Abstract

The mechanical properties of agricultural grains are required in the design of agricultural processes and machinery. These properties are influenced by moisture content and grain type. This study aimed to determine the effect of moisture content and grain type on the mechanical properties of white rice. There are three different types of white rice, namely short-bold (Koshihikari), long-medium (IR 64), and very long-slender (Basmati) grains within three levels of moisture content of 9%, 14%, and 19% were used as the samples in the experiment. The experiment was designed into Completely Randomized Design, factorial 3 x 3. The dimension, internal friction angle, and rupture force of the grain samples were respectively measured using a digital calliper, direct shear cell apparatus, and compression test apparatus. It could be concluded that moisture content, grain type, and the interaction of these two factors significantly affected almost all parameters of the mechanical properties of white rice. Most of the relationships between the parameters of mechanical properties and moisture content could be expressed as linear equations.
In-Vitro Anticancer Activity of Chemical Constituents from Etlingera alba Poulsen against Triple Negative Breast Cancer and in silico Approaches towards Matrix metalloproteinase-1 Inhibition W. Wahyuni; Ajeng Diantini; Mohammad Ghozali; Anas Subarnas; Euis Julaeha; Riezki Amalia; Adryan Fristiohady; Andini Sundowo; Sofa Fajriah; Yuni Elsa Hadisaputri; Raden Maya Febrianti; Fauzia Azzahra; Agung W.M. Yodha; I. Sahidin
Indonesian Journal of Science and Technology Vol 7, No 2 (2022): IJOST: VOLUME 7, ISSUE 2, September 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i2.50547

Abstract

Etlingera alba (EA) is one of the endemic plants grown in Sulawesi. We determined the cytotoxic and anti-metastatic activity of isolates obtained from EA rhizome extract. IC50 value for 1,7-diphenyl-6-heptene-3-one, sitostenone, sinapyl alcohol diacetate, and sinapyl alcohol acetate were 134.59; 170 ; 128.11; and 161.96 μg/mL, respectively. The compounds also had anti-migration activity. 200-μg/mL Sitostenon exhibited the lowest migration rate (3.32%). The free bond energies of sitostenon, 1,7-diphenyl-6-heptene-3-one, sinapyl alcohol acetate, and sinapyl alcohol diacetate were -11.81; -8.25; -6.64; and -6.28 kcal/mol, respectively. All compounds were more effective in stabilizing the Matrix metalloproteinase 1 complex. Isolation from EA rhizomes have the potential to be developed as anti-metastatic for Triple-Negative Breast Cancer.
Products of Apatite-Nepheline Ore Processing in the Synthesis of Low-Modulus Zeolites Yana A. Svakhina; Marina E. Titova; Igor N. Pyagay
Indonesian Journal of Science and Technology Vol 8, No 1 (2023): IJOST: April 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i1.51979

Abstract

The article presented the results of studies on the production of low-modulus zeolites from two types of technogenic resources containing a sufficient amount of silicon in their composition. The raw materials were nepheline concentrate and silica gel, which are products of the processing of apatite-nepheline ore. Directly before the synthesis of low-modulus zeolites, the morphology, chemical composition, and particle size of the starting materials were analyzed. The optimal parameters for sample preparation and purification of the raw materials used were also selected. The influence of the ratio of components in the reaction mixture on the type of synthesized zeolite and its characteristics were studied. The properties of synthesized zeolites from the proposed type of raw material were compared with the properties of zeolites synthesized today using the popular technology from kaolin clay, which is currently offered as an inexpensive natural raw material.
Conversion of Green Silica from Corn Leaf into Zeolites Na A-X Teguh Kurniawan; Dhimas Satria; Juniafit Bima Saputra; Muhammad Roil Bilad; Nik Abdul Hadi Md Nordin; Hairus Abdullah
Indonesian Journal of Science and Technology Vol 7, No 2 (2022): IJOST: VOLUME 7, ISSUE 2, September 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i2.45831

Abstract

Combustion of corn leaf as a model of biomass from agricultural waste is a simple way to obtain the energy. It produces a low-value by-product of ash and is rich in silica that can become a precursor for zeolite production. In this study, acid-treated corn leaves combustion was performed to produce high purity silica (SiO2). The diffraction pattern suggested that the extracted silica was amorphous without the impurities phase. Additionally, the nitrogen isotherm indicated that the material was highly mesoporous silica with a total surface area of 200 m2/g. The hydrothermal method was then applied with a composition molar ratio of 1.25SiO2:1Al2O3:5Na2O:250H2O to synthesize zeolites from the silica. The temperature and time effect on the hydrothermal zeolite’s synthesis was investigated. The diffraction pattern shows that high crystalline zeolite Na A-X was produced at temperatures of 100°C and 8 h hydrothermal time. According to nitrogen physisorption analysis, the zeolite Na A-X consisted of micropores with a total surface area of 270 m2/g. The morphology of zeolite Na A-X was cube for the Na-A and octahedral for the Na-X. The hydrothermal temperature and time highly affected the zeolite formed. This research suggested that the ash waste could be valorized through conversion into a high economic value zeolites.
A systematic Literature Review of Internet of Things for Higher Education: Architecture and Implementation Eddy Soeryanto Soegoto; Herman Soegoto; Dedi Sulistiyo Soegoto; Suryatno Wiganepdo Soegoto; Agis Abhi Rafdhi; Herry Saputra; Dina Oktafiani
Indonesian Journal of Science and Technology Vol 7, No 3 (2022): IJOST: VOLUME 7, ISSUE 3, December 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i3.51464

Abstract

The objectives of this paper are to analyze the implementation and architecture of the Internet of Things (IoT) from previous studies, specifically in the world of higher education; offer recommendations for future research, as well as strengthen the theory of IoT architecture that already exists in higher education. This study employed a systematic literature review (SLR) with data collection utilizing Funnel Diagrams to select articles based on their relevance to the research question. The three publisher databases (Scopus, Emerald, and EBSCO) and index journals were utilized in the search for articles. A total of 1,200 articles were gathered from these three sources, with distributions of up to 800 in Scopus, 150 in Emerald, and 250 in EBSCO. The findings demonstrate that the existing IoT architecture has a more sophisticated model than the fundamental idea, which has three layers, implying that using IoT in education may have a significant influence on user convenience. This is due to the increasingly complicated requirements of higher education's many business procedures. This study serves as an inspiration and reference for future research for higher education institutions that include the Internet of Things in their implementation to build an efficient teaching and learning environment.
Heavy Oil Potentials in Central Sumatra Basin, Indonesia Using Remote Sensing, Gravity, and Petrophysics Data: From Literature Review to Interpretations and Analyses Tri Muji Susantoro; S. Suliantara; Herru Lastiadi Setiawan; Bambang Widarsono; Ketut Wikantika
Indonesian Journal of Science and Technology Vol 7, No 3 (2022): IJOST: VOLUME 7, ISSUE 3, December 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i3.51288

Abstract

Central Sumatra basin is located on Sumatra Island, Indonesia, and is considered an oil prolific basin that produces heavy oil. The basin is believed to have unexplored heavy oil potential. Therefore, this study aims to map the heavy oil potential distribution in the basin using surface and subsurface lineaments analyses interpreted from satellite imagery and gravity data, and assisted by well log/petrophysics analysis. A thorough basin analysis was conducted based on surface/subsurface structures’ control and source rock location settings to map all potential heavy oil traps. The gravity anomaly data interpretation identified the low areas and lineaments in NW – SE, and N – S directions. The interpretation of satellite imageries showed very similar lineament patterns with the same general direction. It was observed that there is continuity between subsurface and surface lineament features, which provide contact between reservoirs and surface water sources, thereby facilitating heavy oil generation. Overlapping the lineament interpretation of gravity and satellite imagery data, supported by petroleum system understanding and verification from wells data have confirmed 7 heavy oil trap potential areas within the sedimentary basin.

Page 19 of 22 | Total Record : 220

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