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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 216 Documents
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Process Design and Modelling of the Production of Butyl Cellosolve Acetate and EO-3 Phosphate Ester Lupete K Bhullar; Zulpan Adi Putra
Indonesian Journal of Science and Technology Vol 2, No 2 (2017): IJoST: VOLUME 2, ISSUE 2, September 2017
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v2i2.8017

Abstract

A chemical company has identified that Butyl Cellosolve Acetate (BCA) and EO-3 Phosphate Ester (EO-3 PE) esters have significant potential in a large variety of applications. However, there is limited information in existing practices involving these particular grades of esters. Hence, the aim of the present work is to develop the process design for the production of these two esters. Within the development stage, the technical and economic challenges of the production processes are evaluated and compared. The results show that, among other things, the BCA process shows the formation of azeotropic mixtures which causes the separation process to be difficult. On the other hand, EO-3 PE shows the formation of aqueous phosphoric acid that is also difficult to separate. Fortunately, this aqueous phosphoric acid can be sold, which then increase the economic attractiveness of the developed process. Monte Carlo simulation were performed to account some uncertainties such as CAPEX estimate, raw material prices and product prices. This simulation shows that the developed BCA process has a significant chance to be non-profitable, while the economic potential of the EO-3 PE process is at least 200% higher than that of the BCA process in all scenarios.
Relationship of Soil Physicochemical Properties and Existence of Phytophthora sp. in Pineapple Plantations Deva Aziz Nanda Martin; Ali Rahmat
Indonesian Journal of Science and Technology Vol 2, No 1 (2017): IJoST: VOLUME 2, ISSUE 1, April 2017
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v2i1.5991

Abstract

One of the tropical fruits with high economic value is pineapple. Pineapple plantation has several limitations, especially in cultivating period and diseases caused by Phytophthora sp. (called heart rot disease). The spread of Phytophthora sp. in pineapple plantation is influenced by physical of soil (called as soil borne pathogen). Here, the purpose of this study was to examine physical properties of soil (compaction), specifically on heart rot disease in pineapple plantation. We used pineaple farm locating in Central Lampung, Indonesia. In this paper, we analyzed the disease impact from the soil compaction point of view. We investigated the difference between soil samples with and without sick plant. The results showed that the disease area were affected by Phytophthora sp. area have high soil compaction. Indeed, this soil condition is good for growing Phytophthora sp.
Early Phase Process Evaluation: Industrial Practices Zulfan Adi Putra
Indonesian Journal of Science and Technology Vol 1, No 2 (2016): IJoST: VOLUME 1, ISSUE 2, September 2016
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v1i2.3808

Abstract

Process route evaluation is a part of research and development (RD) works in an industrial chemical project life cycle. In this early phase, good process evaluation, including process synthesis and designs, provide guidance’s on the RD project. The paper aimed to collect practical methods used in this early phase process route evaluation from author’s 10 years of industrial experiences.  The collected methods range from forward-backward process synthesis, functional process design, use of cost estimation, and applications of Monte Carlo simulation. Led by a good project management (e.g. via a stage-gate approach) use of these methods have shown beneficial results. Some important results are strong arguments on whether or not the project will continue, as well as relevant technical and economic issues identified during this early phase process synthesis and design. Later on, these issues become guidance’s to the follow-up project, if it is continued.
Handwritten Digit Recognition Using Machine Learning Algorithms S M Shamim; Mohammad Badrul Alam Miah; Angona Sarker; Masud Rana; Abdullah Al Jobair
Indonesian Journal of Science and Technology Vol 3, No 1 (2018): IJoST: VOLUME 3, ISSUE 1, April 2018
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v3i1.10795

Abstract

Handwritten character recognition is one of the practically important issues in pattern recognition applications. The applications of digit recognition include in postal mail sorting, bank check processing, form data entry, etc. The main problem lies within the ability on developing an efficient algorithm that can recognize hand written digits, which is submitted by users by the way of a scanner, tablet, and other digital devices. This paper presents an approach to off-line handwritten digit recognition based on different machine learning techniques. The main objective of this paper is to ensure the effectiveness and reliability of the approached recognition of handwritten digits. Several machines learning algorithms (i.e. Multilayer Perceptron, Support Vector Machine, Naïve Bayes, Bayes Net, Random Forest, J48, and Random Tree) have been used for the recognition of digits using WEKA. The experimental results showed that the highest accuracy was obtained by Multilayer Perceptron with the value of 90.37%.
Mitochondrial Biogenesis Induced by Exercise and Nutrients: Implication for Performance and Health Benefits Kazumi Masuda; Thomas Jue; Ronald D. Ray Hamidie
Indonesian Journal of Science and Technology Vol 2, No 2 (2017): IJoST: VOLUME 2, ISSUE 2, September 2017
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v2i2.7995

Abstract

The skeletal muscle occupies about 40% of body mass, one of the largest organs in the body, and it has great plasticity in response to physiological stressors and then alters the contractile and metabolic properties of the muscles. Therefore, healthy status of muscle affects health status of whole body. Mitochondria are abundantly present in mammalian muscle cells, known as the power plants of the cell to generate adenosine triphosphate (ATP) with oxygen. The muscle health depends on the mitochondrial function. In aging and some of metabolic disease states, the mitochondrial function is defected. Some parts of this defect result from lower physical activity and nutritional status. The exercise is well-known as a major strategy to induce mitochondrial biogenesis and upregulation of the mitochondrial function. Recently some nutrients are also suggested as ligands for transcription of the mitochondrial proteins. We also recently found insight of protein interaction with mitochondria that will possibly augment mitochondrial respiratory potential. The present review article introduces some recent research evidences relating to mitochondrial quality control, mitochondrial biogenesis mediated by both exercise and nutrients and an interaction of protein with mitochondria to facilitate mitochondrial respiration.
Geomorphological Analysis and Hydrological Potential Zone of Baira River Watershed, Churah in Chamba District of Himachal Pradesh, India Kuldeep Pareta; Upasana Pareta
Indonesian Journal of Science and Technology Vol 2, No 1 (2017): IJoST: VOLUME 2, ISSUE 1, April 2017
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v2i1.5987

Abstract

In the present study, an attempt has been made to study the quantitative geomorphological analysis and hydrological characterization of 95 micro-watersheds (MWS) of Baira river watershed in Himachal Pradesh, India with an area of 425.25 Km2. First time in the world, total 173 morphometric parameters have been generated in a single watershed using satellite remote sensing data (i.e. IRS-P6 ResourceSAT-1 LISS-III, LandSAT-7 ETM+, and LandSAT-8 PAN OLI merge data), digital elevation models (i.e. IRS-P5 CartoSAT-1 DEM, ASTER DEM data), and soI topographical maps of 1: 50,000 scale. The ninety-five micro-watersheds (MWS) of Baira river watershed have been prioritized through the morphometric analysis of different morphometric parameters (i.e. drainage network, basin geometry, drainage texture analysis, and relief characterizes ). The study has concurrently established the importance of geomorphometry as well as the utility of remote sensing and GIS technology for hydrological characterization of the watershed and there for better resource and environmental managements.
The Influence of Hot Forming on the Microstructure and Corrosion Behaviour of AZ31B Magnesium Alloys Juliawati Alias; Nurul Shuhada Shuhada Mohamed; Mahadzir Ishak; Xiorong Zhou; George E Thompson
Indonesian Journal of Science and Technology Vol 3, No 2 (2018): IJoST: VOLUME 3, ISSUE 2, September 2018
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v3i2.12758

Abstract

The influence of the hot forming process of AZ31B wrought and twin roll cast (TRC) magnesium alloy sheets on the microstructure and corrosion behaviour have been evaluated. The corrosion behaviour was investigated by hydrogen evolution experiments in chloride-containing solution. Filiform-like corrosion was predominant attack to the AZ31 magnesium alloys, as observed by in-situ corrosion observation. The intermetallic particle existence and grain structure significantly influenced the corrosion rate. The dendritic structure of the as-cast TRC alloy was severely attacked, revealing that the as-cast alloy was highly susceptible to corrosion. The presence of twins in wrought alloy was found to act as a corrosion barrier, while the increase in grain size showed the high corrosion rate of the alloy.
Effect of Shell Color and Nursery Depth on the Growth of Pearl Oyster Pinctada Maxima in Tekalok West Nusa Tenggara IndonesiaEffect of Shell Color and Nursery Depth on the Growth of Pearl Oyster Pinctada Maxima in Tekalok West Nusa Tenggara Indonesia Syachruddin A R; Syukur Syukur; Septy Suryaningsih; Ratri Rahmawati; Asim L Khan
Indonesian Journal of Science and Technology Vol 3, No 2 (2018): IJoST: VOLUME 3, ISSUE 2, September 2018
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v3i2.12754

Abstract

The correlation between shell color and pearl oyster growth rates during the breeding phase is not well known and is then explored in this study. In addition, the effect of breeding depth on the growth is also assessed. The tests were conducted by monitoring the growth during a nursing season at a local company at Tekalok, East Lombok, Indonesia. The growth rates were measured from length extension, width extension and weight gain of a total of 4,493 seed samples over a three months nursing period. Results showed that average growth of each group of shell color was homogeneous with acceptable variance. The average length extension of all samples was 1.085 cm/month. The shell color significantly correlates with length extension, in which the yellow one being the highest elongation rate. However, no significant difference in width extension and weight gain was found at a specific condition. A slight decline in growth rate was shown at higher depth, but overall variations in growth rates are insignificant. Since the quality of the resulting pearls is better at higher depth, breeding should be done at higher depth, and further growth after nucleus inclusion can be done at lower depth to yield both optimum growth and high-quality pearl.
Application of Plants Extracts as Green Corrosion Inhibitors for Steel in Concrete - A review Yuli Panca Asmara; Tedi Kurniawan; Agus Geter Edy Sutjipto; Jamiluddin Jafar
Indonesian Journal of Science and Technology Vol 3, No 2 (2018): IJoST: VOLUME 3, ISSUE 2, September 2018
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v3i2.12760

Abstract

High requirements in protection of steel reinforcing bar (steel rebar) from corrosion are necessary since there are multi interaction of corrosive chemicals which cause early damage of concrete buildings. Corrosion of steel in concrete can destroy the concretes and reduce concrete strength. To protect rebar from corrosion, application of corrosion inhibitor is believed to have higher performance compared to other protection systems. To date, organic inhibitors have promising methods in steel rebar protection as they are environment-friendly, compatible with concrete, cost effective and applicable in any various concrete conditions. Thus, demands in using these inhibitors tend to increase significantly. This paper reviews the applications of green corrosion inhibitor specifically highlighted in protecting mechanisms, typical plants extracted, performance in corrosion protection, and classification of green corrosion inhibitors. The corrosion resistances of carbon steels in concrete protected by green inhibitors are in focus. As summary, it can be confidently notified that green corrosion inhibitors for steel in concrete will have a prospect to be used as corrosion prevention in the future with further improvements.
The Effect of Seaweed Extract (Sargassum Sp) Used as Fertilizer on Plant Growth of Capsicum Annum (Chilli) and Lycopersicon Esculentum (Tomato) Siti Fatimah; Hasimah Alimon; Norhayati Daud
Indonesian Journal of Science and Technology Vol 3, No 2 (2018): IJoST: VOLUME 3, ISSUE 2, September 2018
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v3i2.12755

Abstract

Seaweeds, mainly brown species, have long been used as soil fertilizers and have several advantageous effects of spraying their crude extracts on plant growth. Unlike chemical fertilizer, biofertilizers derived from seaweeds or other organisms are usually biodegradable, non-toxic, non-polluting and non-hazardous to humans, animals and birds which will benefit to agriculture sector. In this study, four different concentrations (0.50; 1.00; 2.50; and 5.00 mg/L) of four different solvents extract (hexane, dichloromethane, methanol and water) were used to determine the effect on in vitro seed germination of Capsicum annum and Lycopersicon esculentum. The results showed that concentration 2.50 mg/L can be classified as optimum concentration for seedling development of Lycopersicon esculentum and this study has proven that DCM is the effective extract solvent that result in promoting hypocotyl and root growth of tomato plant. For Capsicum annum, hexane extracts solvent of Sargassum sp. Was found to be more effective than other extracts in promoting seedlings development. Phytochemical screening of Sargassum sp. exhibited the presence of alkaloids and terpenoids as the dominant compenants in all extract.

Page 5 of 22 | Total Record : 216

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