Journal of Engineering and Scientific Research (JESR)
The focus and scopes of JESR is on but not limited to Mechanical Engineering and Material Sciences, Chemical and Environmental, Industrial and Manufacturing Engineering, Computer and Information Technology, Electrical and Telecommunication, Civil and Geodetic Engineering, Architecture and Urban Planning, Geophysical Science and Engineering, and other multidisciplinary research. The main criteria for publication are including the originality, scientific quality and interest to the aim and focus. JESR publishes twice a year for June and December editions. We welcome for publication collaborations with organizer of International Seminars, Conferences and Symposiums around the world. We are encouraging authors to submit their manuscript through our online system.
Articles
141 Documents
<![CDATA[Production and Characterization of Scaffold made of Hydroxyapatite and Pectin of Green Cincau Leaf (Premna Oblongifolia Merr) ]]>
<![CDATA[S Habibie]]>;
<![CDATA[Y Tristiyanti]]>;
<![CDATA[D Gustiono]]>;
<![CDATA[M E Harahap]]>;
<![CDATA[S Y Chalid]]>;
<![CDATA[D Effendi]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 1 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i1.4
<![CDATA[Scaffold is a 3-dimensional matrix created as a new bone cell growth medium made from natural polymers and bioceramics. The extracted pectin from green Cincau leaves (Premna oblongifolia Merr) and hydroxyapatite (HA) are used in the manufacture of scaffolds. 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 freeze dryer. The characterization of extracted pectin and HA-pectin scaffold was then performed. The results showed that pectin of green Cincau leaves had low methoxyl content, which was 1.364 to 5.022%. The resulting scaffold has a pore size ranging from 8.25 to 115 µm while the scaffold resistance to the load, i.e. 0.03 to 0.15 MPa. The scaffold porosity that has been made is 15.33 to 40.97% while the density is 0.69 to 1.02 g/cm3]]>
<![CDATA[The Engine Performance Characteristics of an IDI Diesel Engine Fueled by Soybean Oil Methyl Esters ]]>
<![CDATA[S K Keun]]>;
<![CDATA[A Ghurri]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 1 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i1.5
<![CDATA[An experimental investigation was conducted to evaluate the performance of an indirect injection (IDI) diesel engine using diesel(D100) and diesel-biodiesel blends (BD25, BD45, BD65) separately. The engine was run in various engine loads at constant engine speed ranging from 1000 to 2400 rpm with an interval 200 rpm. The results showed that the biodiesel content decreased the engine torque and power. This might be mainly affected by the lower LHV of the biodiesel, and also the worse combustion due to higher density of the biodiesel compared to the diesel fuel. The loss of power due to lower heating value of biodiesel were notas high as the difference in their heating value that might be down to the better lubricity of biodiesel as proved in the higher brake thermal efficiency and mechanical efficiency when using the biodiesel blends. The brake specific fuel consumption is higher with the increase of biodiesel content but the diesel fuel delivered the highest energy to run the engine. The maximum pressure inside cylinder and the heat release rate of D100 is slightly higher than those of biodiesel blends. Keywords: diesel engine, biodiesel, engine performance, emission.]]>
<![CDATA[Superior Supercapacitors based on Biowaste Materials ]]>
<![CDATA[V Bhat]]>;
<![CDATA[Supriya S]]>;
<![CDATA[G Hegde]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 1 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i1.6
<![CDATA[Carbon nano spheres derived from Allium cepa were synthesized at different temperatures in a one-step pyrolysis process for supercapacitor electrodes. Obtained carbon nano spheres were analyzed using SEM, FTIR, BET and XRD. The nano materials were fabricated into conducting electrodes for cyclic voltammetry, constant current charge-discharge and electrochemical impedance spectroscopy studies. All the studies were done in 3.0 M KOH electrolyte. Specific capacitance from charge discharge experiments were found to be 132.03 F/g and 149.49 F/g for nano materials synthesized at 500ºC and 600ºC respectively. Obtained values suggest a way forward in producing a green electrode for commercial applications.]]>
<![CDATA[The Influence of Geographical Factors on Extreme Rainfalls in Lampung Province ]]>
<![CDATA[M Welly]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 1 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i1.7
<![CDATA[Many people in Indonesia calculate design rainfall before calculating the design flood discharge. The design rainfall with a certain return period will eventually be converted into 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 are not hydrologically measured (ungauged basin), so it is quite difficult to know the characteristics of rain in the area concerned. This study aims to analyze the characteristics of design rainfall in Lampung Province. The focus of the analysis is to investigate whether geographical factors influence the design rainfall that occurs in the particular area. The data used in this study is daily rainfall data from 15 rainfall recording stations spread in Lampung Province. The method of frequency analysis used in this study is the Gumbel method. The research shows that the geographical location of an area does not have significant effect on extreme rainfall events. The effect of rising earth temperatures due to natural exploitation by humans tends to be stronger as a cause of extreme events such as extreme rainfall.]]>
<![CDATA[Modeling Stock Return Data using Asymmetric Volatility Models: A Performance Comparison based on the Akaike Information Criterion and Schwarz Criterion ]]>
<![CDATA[E Setiawan]]>;
<![CDATA[Netti Herawati]]>;
<![CDATA[K Nisa]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 1 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i1.8
<![CDATA[The Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model has been widely used in time series forecasting especially with asymmetric volatility data. As the generalization of autoregressive conditional heteroskedasticity 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) and Asymmetric Power GARCH (APGARCH) models. This paper aims to compare the performance of the three enhancements of the asymmetric volatility models by means of applying the three models to estimate real daily stock return volatility data. The presence of leverage effects in empirical series is investigated. Based on the value of Akaike information and Schwarz criterions, the result showed that the best forecasting model for our daily stock return data is the APARCH model]]>
<![CDATA[Reusability Study of Sulfated Zirconia Functionalized SBA-15 Catalyst for Biolubricant Oil Production from Oleic Acid ]]>
<![CDATA[F R Rangganita]]>;
<![CDATA[Lilis Hermida]]>;
<![CDATA[A Angraeni]]>;
<![CDATA[D Khoirunnisa]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 1 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i1.9
<![CDATA[Sulfated zirconia functionalized SBA-15 catalsyt (SZr-SBA-15) was prepared by reacting 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 produce SZr-SBA-15 catalsyt.. The catalyst was characterized in terms of adsorptiondesorption nitrogen analysis, SEM-EDX and FTIR. Based on SEM-EDX and adsorption-desorption nitrogen analysis results, it was found that Zr had been incorporated in SBA-15. By using the SZr-SBA-15 catalyst, esterification reaction of oleic acid with TMP to produce biolubricant oil of Trimethylolpropanetrioleat achieved 85% oleic acid conversion and selectivity of 63,7%. Reusability study of SZr-SBA-15 catalyst was carried out for 3 rounds of reaction. It was found that the catalyst could be used up to 3 rounds without significant decrease in activity]]>
<![CDATA[Energy Efficient Healthcare Monitoring System using 5G Task Offloading: Energy Efficient Healthcare Monitoring System using 5G Task Offloading ]]>
<![CDATA[T Sigwele]]>;
<![CDATA[A Naveed]]>;
<![CDATA[Misfa Susanto]]>;
<![CDATA[M Ali]]>;
<![CDATA[Y F Hu]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 2 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i2.12
<![CDATA[Healthcare expenses can be significantly reduced, and lives saved by enabling the continuous monitoring of patient health remotely using Wireless Body Sensor Networks (WBSN). However, an energy efficient mobile gateway (e.g. 5G smartphone) is required which moves with the patient in real time to process the data from the bio sensors without depleting the battery. Thispaper proposes a 5G based healthcare cardiovascular disease Remote Monitoring system called 5GREM using Electrocardiogram (ECG) bio sensor as a BSN device. The aim is to monitor and analyse the patient’s heart rhythms and send emergency alerts during irregularities to the nearest caregivers, ambulance or physician to minimize heart attacks and heart failures while saving energy. Since ECG signal execution is computer intensive, requests from the ECG sensor are either executed locally on thegateway, offloaded to nearby mobile devices or to the 5G edge while considering the battery level, CPU level, transmission power, delays and task fail rate.]]>
<![CDATA[Similarity Analyzer for Semantic Interoperability of Electronic Health Records Using Artificial Intelligence (AI) ]]>
<![CDATA[A Naveed]]>;
<![CDATA[Y F Hu]]>;
<![CDATA[T Sigwele]]>;
<![CDATA[G Mohi-Ud-Din]]>;
<![CDATA[Misfa Susanto]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 2 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i2.13
<![CDATA[The introduction of Electronic Health Records (EHR) has opened possibilities for solving interoperability issues within the healthcare sector. However, even with the introduction of EHRs, healthcare systems like hospitals and pharmacies remain isolated with no sharing of EHRs due to semantic interoperability issues. This paper extends our previous work in which we proposed a framework that dealt with semantic interoperability and security of EHR. The extension is the proposal of a cloud-based similarity analyzer for data structuring, data mapping, data modeling and conflict removal using Word2vec Artificial Intelligence (AI) technique. Different types of conflicts are removed from data in order to model data into common data types which can be interpreted by different stakeholders]]>
<![CDATA["MESE" Fundamental Concept for Human Interior Designer ]]>
<![CDATA[P S Andereas]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 2 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i2.15
<![CDATA[Interior designer is a profession that is most responsible for the whole series of human activities on this earth. It is very important to place this concept because all important aspects of the human life in this space are fully in contact with the profession of interior designer. The education of interior designing is not just about creating ideas on how to create beauty and designspaces, but also about having responsibilities on various aspects in life. In the era of digitalization and where the components of life become increasingly complex, interior designers must be able to play the appropriate role to solve life’s problems. The developments in various aspects of ecology are also connected to interior designers, for example, recycling the waste must be one of interior designer’s goals. Experimenting, innovating, and becoming part of social life is the actual responsibility of interior designer, not living in the works of hedonism. This paper aims to highlight the concept work of MESE (material-experiment and social-entrepreneurship) in the interior design.]]>
<![CDATA[Fabricating and Testing of Porous Magnesium Through Powder Metallurgy Technique using TWSH (Titanium Wire Space Holder) for Biodegradable Bone Scaffold Material ]]>
<![CDATA[Irza Sukmana]]>;
<![CDATA[S Savetlana]]>;
<![CDATA[Y Burhanudin]]>;
<![CDATA[M A Wicaksono]]>;
<![CDATA[Hadi Nur]]>
<![CDATA[ Journal of Engineering and Scientific Research Vol. 1 No. 2 (2019) ]]>
Publisher : <![CDATA[Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141 ]]>
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DOI: 10.23960/jesr.v1i2.18
<![CDATA[Magnesium (Mg) and its alloys seem to be a potential biodegradable bone scaffold materials as their biocompatibility and mechanical properties fit to natural bone. Magnesium alloys as biomaterials have higher mechanical properties that may close to cancellous bone once composed and produced in a specific production route. Fabricating porous magnesium for bone scaffold material aims to reduce the rigidity and strength of the material by which the porous density can be adjusted to the original nature of the bone. It forms interconnected porosity, has physical and mechanical properties similar to cancellous bone. This paper describes the production and characterization of porous magnesium material for the potential application as bone scaffold through powder metallurgy technique with pieces of Titanium Wire Space Holder. Mg containing titanium pieces were then compacted and sintered before immersed in hydro fluoride acid solution to form a porous magnesium structure. Density and porosity, micro Vickers hardness, micro structure test and SEM-EDX were performed to prove the existing porous structure inside Mg metal. The result finds out that a good cooperation and a potential application for the fabrication of an inter-connected porous magnesium samples for cancellous bone implant.]]>
