Indonesia Conference Directory

Corresponding Author
Wasu Cheewasukhanont

Institutions
a) Physics program, Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand
*wasu.kotzen[at]gmail.com
b) Center of Excellence in Glass Technology and Materials Science (CEGM) Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom 73000 Thailand

Abstract
The theoretical calculations on radiation shielding parameters of glass systems in the composition (80-x) B2O3: 20Na2O: xBi2O3 (where x = 0,5,10,15 and 55 mol%) were inquired into using the WinXCom program. The characteristics of radiation shielding parameters for the glass systems had been examined for the mass attenuation coefficients, the effective atomic number, and the electron density in the energy ranges of 1 keV to 100 GeV. These are the glass systems at the different compositions of bismuth which were found that depend upon the energy regions. The results demonstrate that the mass attenuation coefficients, the effective atomic number, and the electron density have the same trend which those values increase with the increasing of the different compositions of bismuth. At the low-energy region, the mass attenuation coefficients show the several discontinuous jumps of the energies which correspond to the photoelectric absorption edges. At the medium-energy region, the Compton scattering process is the main interaction in these energy ranges. In the high-energy regions, pair production becomes the main interaction process and tends to be constant over energy.

Keywords
Radiation shielding materials; Bismuth sodium borate; glasses shielding

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/exPvwkRJAHrj

Corresponding Author
Lucky Darmawan

Institutions
Universitas Indonesia

Abstract
In this paper, we report magnetic and microwave absorbing properties of magnetic based nanocomposites, which synthesized through mechanically alloyed the magnetic crystalline powders. The first component of composite was Mn andTi doped Barium hexaferrite (BaFe12O19) or BHF obtained through a mechanical alloying process which was mixed with the second component of mechanically alloyed the CoFe2O4 magnetic compound to form composites of [Ba (Fe, Mn, Ti) 12O19]1-x/[CoFe2O4] x (x = 0.2; 0.5; 0.8) compositions. Prior to composite the two magnetic components, the remanence and saturation magnetization of the components were obtained optimally. Before Mn-Ti doping, the BHF has remanence (Mr) and saturation magnetization 0.206 T and 0.42 T respectively, with the corresponding coersivity (Hc) was 263.1 kA/m. On the other hand, CoFe2O4 (CFO) which has a high saturation magnetization (0.48 T) but with a low coersivity (16.22 kA/m). In form of magnetic composite, the high remanence was almost retained, but with the coercivity value decreased further to the lowest 80.82 kA/m. These two main properties (high remanence and low coercivity) were led the composite being good candidates for microwave absorbing materials. Microwave absorbing characteristics of [Ba(Fe,Mn,Ti)12O19]1-x/[CoFe2O4]x (x = 0.2; 0.5; 0.8) composites were discussed inthis paperin relation with their corresponding magnetic properties for designing the best microwave absorbing materials.

Keywords
Cobalt ferrite, Barium Hexaferrite, mechanically alloying, magnetic properties, microwaves absorbing material, nanocomposite magnet.

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/bZN7VLrcyaxq

Corresponding Author
Eddy Ibrahim

Institutions
a,b) Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Sriwijaya,
c) Jurusan Teknik Elektro, Fakultas Teknik, Universitas Sriwijaya,
Jl. Srijaya Negara Bukit Besar, Palembang, 30139, Indonesia ;
*eddyibrahim[at]ft.unsri.ac.id

Abstract
Volumetric method is one method of calculating oil and gas reserves in reservoirs that have been used in the oil industry to date. Data sources which become the main requirements in using this method are basic data such as log data, core rocks or side terraces, area estimates, Rf and fluid properties. This method is used to obtain a forecast of the remaining reserves of Well X for future use. Based on the data limitations in Well X there is only Logging (thickness) data whose range is between 650 m and 700 m, the recovery factor is assumed to be 100% and the area of distribution of wells in one block is 13 km2. From the results of calculations using the volumetric method, the remaining reserves in well X are 320,853.63 STB and the remaining natural gas is 1,801,539.11 SCF.

Keywords
Logging, Oil and Gas, Remaining Reserves, Recovery Factor, Volumetric Method

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/DAazFENHq3kw

Corresponding Author
Rajaramakrishna R

Institutions
(a) Department of Physic, B.G.S R&D Centre, SJC Institute of Technology, Chikkaballapur, Karnataka, India
(b) Department of PG studies and research in physics, The National College, Jayanagar, Bangalore - 560070
(c) Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom, 73000, Thailand
(d) Department of Physics, SDM Institute of Technology, Belathangady, Ujire, Karnataka, India - 574240
(e) Department of Physics, Brindavan College of Engineering, Bangalore,560063, India
*r.rajaramakrishna[at]gmail.com, **mink110[at]hotmail.com

Abstract
The glass systems with composition 20SrO-5CaO-40Li2O-(35-x) B2O3-x Eu2O3 (x = 0.3, 0.5 and 1 mol%) glasses were prepared by melt quenching technique to study absorption and luminescence properties and understand their lasing properties. The present work reports the studies on Physical, Optical and luminescence properties of the prepared glass systems. The photoluminescence (PL) intensity of the glass increases with increase in Eu2O3 content upto 1mol%. The increase in the density and decrease in molar volume reveals the close packing of glass network. For Eu3+ emission the most intense red emission has been observed at the wavelength of 614nm for the transitions 5D0 &

Keywords
Eu3+ ions, Photoluminescence, UV-Vis-NIR, Phonon side band, Lifetime.

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/Q8LmW36XRVDx

Corresponding Author
Rachmat Mulyana

Institutions
Jurusan Pendidikan Teknik Bangunan, Fakultas Teknik Universitas Negeri Medan

Abstract
Cases of injury or accident of construction workers are not entirely caused by negligence of the workers themselves, the atmosphere of construction management built by the contractors or developers also contributes to creating an atmosphere of comfort and security for construction workers. The purpose of this study is to evaluate the application of K3L procedures in the process of carrying out construction work by the constructor or developer. The study was conducted through 2 (two) surveys. The first survey was conducted to identify ongoing construction works projects in the Medan, Deli Serdang and Langkat areas. The second survey conducted an evaluation of the application of K3L to 8 contractors in 8 selected projects.Projects that have become the object of research consist of dam projects, hotels, water and sewage pump buildings, shopping buildings and industry. Analysis Evaluation of the implementation of K3L is used quantitative and qualitative descriptive methods. Worker Safety and Health each element is given a value which if "yes" has value (+1) and "no" value (0). This value results in frequency (number) and percentage that concludes the successful application of K3L in the project. Analysis of constraints in applying OHS to building construction projects is a factor causing imperfections in its application, using qualitative descriptive methods.The results showed that on average companies or contractors only applied 23 K3L items or 51% of all items that needed to be done or applied. The number of items in the aspect of K3L implementation applied by companies or contractors only ranges from 12 - 33 items (27% - 73%). This shows that the compliance level of the company or constructor is still low in implementing K3L and several construction works projects.

Keywords
K3L, Construction, Contractors, Workers, Projects

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/evHqkuYBDQcy

Corresponding Author
Fransiscus Benhardi Wastuwidya

Institutions
Civil Department, Universitas Indonesia, Depok, Indonesia

Abstract
Mining is one of the leading industrial sectors in Indonesia but has a negative impact on the environment. Acid mine drainage (AMD) is one of the negative impacts of mining activities that can cause environmental problems and require efficient and effective treatment. The development of acid mine drainage treatment involves the use of microalgae for remediation. The problem with the use of microalgae in AMD is the environmental conditions of AMD that limit the growth of microalgae where AMD has a high metal content, and low pH. This research was conducted to examine the adaptability of Botryococcus braunii microalgae on AMD media. The study was conducted on photobioreactors by varying the concentration of AAT at 25%, 50%, 75%, and 100% to assess the growth rate and removal efficiency of Fe and Mn metals as well as the pH increase in AMD. Botryococcus braunii is expected to be able to adapt gradually to the AMD media, so that AMD can become a growing medium for the microalgae. The output of this research is expected to be able to give an idea of the possible application of microalgae to biological AMD treatment.

Keywords
acid mine drainage, microalgae, mining, remediation

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/Ud2ejtkhKP64

Corresponding Author
Devi Lestari

Institutions
Ani Iryani12, Devi Lestari2, and Djoko Hartanto3*
1Department of Chemistry, Universitas Pakuan, Bogor, Indonesia, 16143, ani_iryani62[at]yahoo.co.id
2Department of Chemistry, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia, lestaridevi270[at]gmail.com
3Department of Chemistry, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia, askanovitas[at]gmail.com
(Djoko Hartanto *)

Abstract

Keywords
ZSM-5, TiO2, Photocatalys, Disperse Blue, Carbon Source

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/cJxL4EnG36jy

Corresponding Author
Muhammad Freddy Kissinger

Institutions
a) Postgraduate Program of Materials Science, Faculty of Mathematics and Natural Science, Universitas Indonesia, Jl. Salemba Raya No.4, Jakarta 10430, Indonesia
*azwar[at]ui.ac.id

b) Indonesian Institute of Sciences, LIPI, Komplek PUSPITEK, Serpong, Banten 15314, Indonesia

Abstract
Polypirrole (PPy) is one of conductive polymer material has been success sinthesized through polymerization process using chemical oxidative reaction by batch polymerization technique. The synthesis was conducted at room temperatur with agitation speed within 300-500 rpm. The certain amount of pirolle monomer was reacted with ammonium persulphate in the aquaeous media. Demineralized water is the only one solvent was involved in the reaction. The presence of 0%, 1%, 2% and 3% of Polyvinil alcohol (PVA) in the synthesis of PPy was investigated. Washing process found maximal after four times washing indicated by FTIR spectrum, phisical appearance, color and conductivity value of the filtrate of residual washing treatment. While the syntheiszed PPy with presence of PVA obtained higher conductivity compare when PVA free. The conductivity value was 57,000 , 56,000 us/cm for additional 1% and 2% of PVA respectively. It is significantly increased when PVA free involved in the reaction. Other supporting characterization during synthesis was conducted such as pH measurement, density, viscosity, temperature and colour degradation observation. The appearance of PPy when presence PVA is being emulsion and different when absence of PVA which obtained powder or solid form of PPy. Black polymer emulsion with various viscosity of PPy was observed completely.

Keywords
Polypirrole; Conductive polymer; Polyvinil alcohol; Batch polymerization

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/Kq9U2pAfQZHL

Corresponding Author
Dina Yauma Asra

Institutions
a)Department of Physics, IPB University, Bogor, 16680, Indonesia

b)Advanced Research Laboratory, IPB University, Bogor, 16680, Indonesia

Abstract
Hydroxyapatite (HA) is a biomaterial that is widely used for bone implantation because it is bioactive and biocompatible. To improve the bioactive and biocompatible properties of hydroxyapatite, natural ingredients are used as a calcium source. In this study, the material used for calcium source is from paddy field snail shells. Snail shells produced from the process of boiling, cleaning, and drying calcined at a temperature of 800C for 3 hours to obtain the powders. Calcium phase and calcium content of the powder was identified using x-ray diffractometer (XRD) and atomic absorption spectroscopy (AAS). The results of the analysis showed that the calcium phase of the snail shell is Ca(OH)2 with calcium content of 52.12%. Synthesis of HA was carried out by precipitation method at 75C by dripping H3PO4 into calcium solution and continued with two treatments, with and without sintering process. The powders were then characterized by XRD and FTIR. The results of the analysis showed that HA formed in samples that using sintering process and carbonate apatite appears in samples without sintering process.

Keywords
Biomaterial, Hydroxyapatite, Snail shells, XRD

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/LqUxKRNJkdF6

Corresponding Author
Nurfajriani Nurfajriani

Institutions
(a)Department of Chemistry, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan, Indonesia, 20221
*nurfajriani[at]unimed.ac.id
(b)Department of Physic, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan, Indonesia, 20221
(c)Fresh graduated, 1Department of Chemistry, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, Medan, Indonesia, 20221

Abstract
The aim of this investigation was to create Carboxymethyl Cellulose (CMC) from the nata de coco cellulose. The nata de coco was produced by fermentation method of coconut water used acetobacter xylinum. Bacterial cellulose (BC) was isolated by furification nata de coco with 1% NaOH and 1% asetic acid solutions resfectively. In the process of making CMC, dried BC was immersed in isopropanol medium, then alkalised with 10%, 15% and 20% NaOH solutions respectively for 1 hour at a temperature of 55 oC. Then BC reacted with 18 grams of chloroacetic acid. FTIR analysis results show that CMC was successfully synthesized from BC. The increase in NaOH concentrations in the CMC preparation caused an increase in the degree of substitution (DS). DS is one of the main parameters of the success of the CMC synthesis process from the initial raw material for cellulose. At a concentration of 20% NaOH, the resulting CMC synthesized with DS 0.743 was better than 10% NaOH with DS 0.371.

Keywords
nata de coco; acetobacter xylinum; bacterial cellulose; carboxymethyl cellulose; degree of substitution

Topic
Material Science and Engineering

Link: https://ifory.id/abstract/3T9jv7eapGBW