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Irza Sukmana
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Lampung
INDONESIA
Journal of Engineering and Scientific Research
Published by Universitas Lampung
ISSN : 26850338     EISSN : 26851695     DOI : -
JESR accepts contribution and submission for original as well as critical review manuscripts that focus on the field of engineering, sciences, and their interdisciplinary researches. The scopes are including but not limited to: Electrical and Telecommunication; Mechanical and Industrial; Geophysics; Aeronautics; Mining and Materials; Chemical and Environmental; Civil and Architecture; Computer & Information Technology, Mathematics; Physics ad Biophysics; Nano- and Quantum Sciences; Biosciences and Bioinformatics; Astronomy; Basic and Applied Chemistry Science, Medical Sciences and Biomedical Engineering, and Agriculture Engineering and Food sciences.
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Articles 8 Documents
Production and Characterization of Scaffold made of Hydroxyapatite and Pectin of Green Cincau Leaf (Premna Oblongifolia Merr) Habibie, S; Tristiyanti, Y; Gustiono, D; Harahap, M E; Chalid, S Y; Effendi, D
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (435.663 KB) | DOI: 10.23960/jesr.v1i1.4

Abstract

Scaffold is a 3-dimensional matrix created as a new bone cell growth medium madefrom natural polymers and bioceramics. The extracted pectin from green Cincau leaves(Premna oblongifolia Merr) and hydroxyapatite (HA) are used in the manufacture ofscaffolds. Pectin was extracted using citric acid with variation concentration of 0, 0.1,0.2 and 0.3% (w / v). The 3% (w / w) HA-pectin mixture, dried freeze using a freezedryer. The characterization of extracted pectin and HA-pectin scaffold was thenperformed. The results showed that pectin of green Cincau leaves had low methoxylcontent, which was 1.364 to 5.022%. The resulting scaffold has a pore size rangingfrom 8.25 to 115 µm while the scaffold resistance to the load, ie 0.03 to 0.15 MPa. Thescaffold porosity that has been made is 15.33 to 40.97% while the density is 0.69 to1.02 g/cm3Keywords: Green Cincau Leaf, Hydroxyapatite, Pectin, Scaffold
The Engine Performance Characteristics of an IDI Diesel Engine Fueled by Soybean Oil Methyl Esters Ghurri, A; Keun, S K
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (420.766 KB) | DOI: 10.23960/jesr.v1i1.5

Abstract

An experimental investigation was conducted to evaluate the performance of anindirect injection (IDI) diesel engine using diesel (D100) and diesel-biodieselblends (BD25, BD45, BD65) separately. The engine was run in various engineloads at constant engine speed ranging from 1000 to 2400 rpm with an interval200 rpm. The results showed that the biodiesel content decreased the enginetorque and power. This might be mainly affected by the lower LHV of thebiodiesel, and also the worse combustion due to higher density of the biodieselcompared to the diesel fuel. The loss of power due to lower heating value ofbiodiesel were not as high as the difference in their heating value that might bedown to the better lubricity of biodiesel as proved in the higher brake thermalefficiency and mechanical efficiency when using the biodiesel blends. The brakespecific fuel consumption is higher with the increase of biodiesel content but thediesel fuel delivered the highest energy to run the engine. The maximum pressureinside cylinder and the heat release rate of D100 is slightly higher than those ofbiodiesel blends.Keywords: diesel engine, biodiesel, engine performance, emission.
Superior Supercapacitors based on Biowaste Materials Bhat, V; S, Supriya; Hegde, G
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (890.274 KB) | DOI: 10.23960/jesr.v1i1.6

Abstract

Carbon nano spheres derived from Allium cepa were synthesized at differenttemperatures in a one-step pyrolysis process for supercapacitor electrodes. Obtainedcarbon nano spheres were analyzed using SEM, FTIR, BET and XRD. The nanomaterials were fabricated into conducting electrodes for cyclic voltammetry, constantcurrent charge-discharge and electrochemical impedance spectroscopy studies. All thestudies were done in 3.0 M KOH electrolyte. Specific capacitance from chargedischarge experiments were found to be 132.03 F/g and 149.49 F/g for nano materialssynthesized at 500ºC and 600ºC respectively. Obtained values suggest a way forward inproducing a green electrode for commercial applications.Keywords: Carbon nano spheres, supercapacitor electrodes, bio material
The Influence of Geographical Factors on Extreme Rainfalls in Lampung Province Welly, M
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (430.02 KB) | DOI: 10.23960/jesr.v1i1.7

Abstract

Many people in Indonesia calculate design rainfall before calculating the design flooddischarge. The design rainfall with a certain return period will eventually be convertedinto a design flood discharge by combining it with the characteristics of the watershed.However, the lack of a network of rainfall recording stations makes many areas that arenot hydrologically measured (ungauged basin), so it is quite difficult to know thecharacteristics of rain in the area concerned. This study aims to analyze thecharacteristics of design rainfall in Lampung Province. The focus of the analysis is toinvestigate whether geographical factors influence the design rainfall that occurs in theparticular area. The data used in this study is daily rainfall data from 15 rainfallrecording stations spread in Lampung Province. The method of frequency analysis usedin this study is the Gumbel method. The research shows that the geographical location ofan area does not have significant effect on extreme rainfall events. The effect of risingearth temperatures due to natural exploitation by humans tends to be stronger as a causeof extreme events such as extreme rainfall.Keywords: Influence, geographical, factors, extreme, rainfall.
Modeling Stock Return Data using Asymmetric Volatility Models : A Performance Comparison based on the Akaike Information Criterion and Schwarz Criterion Setiawan, E; Herawati, N; Nisa, K
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (291.825 KB) | DOI: 10.23960/jesr.v1i1.9

Abstract

The Generalized Autoregressive Conditional Heteroscedasticity (GARCH) modelhas been widely used in time series forecasting especially with asymmetricvolatility data. As the generalization of autoregressive conditionalheteroscedasticity model, GARCH is known to be more flexible to lag structures.Some enhancements of GARCH models were introduced in literatures, among themare Exponential GARCH (EGARCH), Threshold GARCH (TGARCH) andAsymmetric Power GARCH (APGARCH) models. This paper aims to compare theperformance of the three enhancements of the asymmetric volatility models bymeans of applying the three models to estimate real daily stock return volatilitydata. The presence of leverage effects in empirical series is investigated. Based onthe value of Akaike information and Schwarz criterions, the result showed that thebest forecasting model for daily stock return data is the APARCH model.Keywords: Volatility, GARCH, TGARCH, EGARCH, APARCH, AIC and SC.
The Potentials of Improving Mineral Source Additional Values in Lampung Province – A Preliminary Study Isnugroho, K; Birawidha, D C; Amin, M
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (391.745 KB) | DOI: 10.23960/jesr.v1i1.2

Abstract

An initial research on non-metal mineral potential was conducted for stones inLampung Province. Surveys were conducted to some districts/towns in Lampung to takesample materials. Non-metal mineral chemical composition content analysis of stoneswas conducted with X-RF method. Lampung had mineral potentials of feldspar, zeolite,kaolin, and basalt of 400,500,000 m3; 18,945,000 m3; 9,750,000 m3; 419,071,833 m3respectively. These mineral source potentials were distributed in eight districts inLampung. Processing was required to improve additional values for these mineralsources, including crushing, grinding, classifying, and concentration process.Concentration improvements were required for feldspar and kaolin minerals. Wet highintensity magnetic separator process followed by froth flotation process becamesolutions to reduce high oxide iron content. Feldspar and kaolin could be used for suchindustries of ceramic, glass, paper, and refractory. Meanwhile, the zeolite mineral fromLampung could be used for agriculture, plantation, and fishery. Basalt stone wouldhave additional values when this was processed into cast basalt, fiber, and ceramiccomposite.Keywords: feldspar, kaolin, basalt, zeolite, Lampung
Reusability Study of Sulfated Zirconia Functionalized SBA-15 Catalyst for Biolubricant Oil Production from Oleic Acid Rangganita, F R; Hermida, L; Angraeni, A; Khoirunnisa, D
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (355.643 KB) | DOI: 10.23960/jesr.v1i1.10

Abstract

Sulfated zirconia functionalized SBA-15 catalsyt (SZr-SBA-15) was prepared byreacting SBA-15 with Zirkoniumoxychloride and urea at 90oC to form ZrO2-SBA-15. Then, ZrO2-SBA-15 was reacted with H2SO4 at room temperature to produceSZr-SBA-15 catalsyt.. The catalyst was characterized in terms of adsorptiondesorption nitrogen analysis, SEM-EDX and FTIR. Based on SEM-EDX andadsorption-desorption nitrogen analysis results, it was found that Zr had beenincorporated in SBA-15. By using the SZr-SBA-15 catalyst, esterification reactionof oleic acid with TMP to produce biolubricant oil of Trimethylolpropanetrioleatachieved 85% oleic acid conversion and selectivity of 63,7%. Reusability study ofSZr-SBA-15 catalyst was carried out for 3 rounds of reaction. It was found that thecatalyst could be used up to 3 rounds without significant decrease in activityKeywords: biolubricant oil, catalyst reusability, sba-15, sulfated zirconia.
The Improvement of Paclitaxel Cytotoxicity using Nanocellulose based Nature Resources Nahrowi, R; Setiawan, A; Noviany, Noviany; Sukmana, I; Yuwono, S D
Journal of Engineering and Scientific Research Vol 1, No 1: (June, 2019)
Publisher : University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (672.714 KB) | DOI: 10.23960/jesr.v1i1.3

Abstract

Paclitaxel is one of the cancer drugs that often used. These drug kills cancer cells byinhibiting mitotic cycle. The efficiency of paclitaxel is increased by the use ofnanomaterials as a carrier of paclitaxel. Nanomaterials can enhance encapsulationefficiency, improve the drug release to the target cell following nanomaterialdegradation, and improve local accumulation of drug in the cell through endocytosisreceptor. Nanomaterial that often used forencapsulation of paclitaxel is a polymerderived from natural resources such as cellulose. The advantages of cellulose as acarrier of paclitaxel are nontoxic, biodegradable, and very abundant from varioussources. One of the potential sources of cellulose for drug delivery system is cassavabaggase.Keywords: Paclitaxel, encapsulation, cell viability, nanocellulose

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