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Journal of Engineering and Scientific Research (JESR)

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Published by Universitas Lampung

ISSN : 26850338 EISSN : 26851695 DOI : https://doi.org/10.23960/jesr.v4i1.78

Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Engineering Industrial & Manufacturing Engineering

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.

Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)

Articles 8 Documents

Search results for , issue "Vol. 3 No. 1 (2021)" : 8 Documents clear

Dashboard Monitoring Atmospheric Corrosion Sensor in Material Metal Using Laravel Framework Nima Rohmalia; Gigih Forda Nama; Nining Purwasih
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Corrosion is a chemical reaction that occurs in materials made of iron such as steel. Steel that is experiencing corrosion will appear dark brown spots, the longer it is getting more and more and can cover the entire surface. Corroded steel will result in a major deterioration and structural failure because the thickness of the steel will decrease over a period of time, so the safety of the building is clearly not guaranteed. Research on the tools used to detect the corrosion value of steel has been carried out. However, not using the internet of things technology. Therefore, a web-based corrosion monitoring or monitoring system was designed. The web will display data on voltage and temperature values ??in the form of numbers and charts. In addition, the website can also send SMS and Whatsapp message notifications if the value obtained exceeds the threshold. In developing this website using the prototype method, Laravel Framework, PHP and Java programming languages, MySQL database, Guzzle, and Whatspie as automatic message sending bots. System can provide information of monitoring regarding dummy, active and delta voltage along with their time and temperature.

Frequency Stability Control In Low -Inertia Power System Using Virtual Synchronous Generator Novia Utami Putri; Khairudin khairudin; Nining Purwasih
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

The stability of the electric power system is divided into transient stability, steady state stability and dynamic stability. Things that affect the performance of the generator include the addition of generators, changes in the load that vary in the system which have an impact on system stability and the distance between the generator and the load. The addition of a Virtual Synchronous Generator (VSG) is needed to improve the power system that is integrated with Renewable Energy Systems Source in maintaining system stability. When the integration between conventional generators and Renewable Energy Systems Source without Virtual Synchronous Generator (VSG) has a frequency response of 58.2 Hz when the generating capacity is -40% of the initial state, while integration between conventional generators and Renewable Energy Systems Source with Virtual Synchronous Generator (VSG) has a steady state response of 60 Hz even though the generating condition is 40% of the initial capacity of the generator. This means that the Virtual Synchronous Generator (VSG) can stabilize the return frequency in its nominal value on the system. Keywords : Inertia, Conventional Generating, Renewable Energy Systems Source, Virtual Synchronous Generator (VSG).

The Effect of Basalt Material Composition and Rice Husk Ash on The Characterization of Paving Block M Amin; Sudibyo Sudibyo; M Jannah; P Karo Karo
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Paving block (concrete brick) is a composition of building materials made from a mixture of Portland cement or other hydraulic adhesive. The making of paving blocks is done by a process of molding, soaking, physical testing including compressive strength, density, porosity, and absorption, and characterization including XRF and XRD. The paving blocks are made without the addition of basalt stone and rice husk ash and with the addition of 5%, 10%, 15%, 20% and 25% with a test life of 7 days, 14 days and 28 days. The materials used are cement, sand, basalt stone, rice husk ash and water. Paving blocks without the addition of basalt stone and rice husk ash have the highest compressive strength at the test age of 28 days of 9.9 MPa and absorption of 15.06%, whereas with the addition of basalt stone and rice husk ash the highest compressive strength is at a concentration of 5% at age 28day test of 12.25 MPa and the absorption value of 7.12%. The results of XRF characterization showed that the more concentrations of basalt stone and rice husk ash, the CaO contained in the paving blocks increased while the SiO2 decreased. The results of XRD characterization showed that the phases formed were ternesite, microline maximum and yeelimite.

The Evaluation of Thin-Plate Low Carbon Steel in Spot Welding with Non-Destructive Test (NDT) and Destructive-Test (DT): Pressure Effect Agus Sifa; T Endramawan; Badruzzaman Badruzzaman
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

This paper has the purpose of how the pressure affects the weld quality and weldability on thin-plate low carbon steel with a thickness of 1 + 1 mm. The method used to know the impact of the welding quality by experimenting with the welding process with low carbon steel thin plate material with a composition of 99,65% Fe and 0,05% C, it is low carbon steel and has a thickness of 1 + 1 mm using Cu electrode by providing the various parameters given the pressure of 1-5 bar, testing of Non-Destructive Test (Ultrasonic Test) and Destructive Test (DT): shear testing, microstructure test. The result of NDT testing obtained deformation of thick plate thickness at 1 bar pressure has bigger deformation compared to 5 bar pressure, while in microstructure test result of 1-2 bar pressure has better weldability than the pressure of 3-5 bar, while the result of the tensile - shear test obtained a large load of 1 bar of 544 kgf greater than 5 bar tensile - shear test with load 248 kgf, it can be recommended for welding on thin-plate low carbon steel 1 + 1 mm thickness can be given 1 bar loading.

Rapidness Characteristics of Ultrasonic Wave Propagation on Eggs Using HC-SR04 Module Y E Putra; Sri Ratna Sulistiyanti; FX Arinto Setyawan; A S Samosir
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Fertility rate is one of the main factors of the success of an egg in order to hatch properly. The process of egg fertility detection is currently visually based, using manual methods (by carrying eggs one by one). This takes time and cost so that it will affect the production of poultry cultivation. This study aims to find out the characteristics of rapid propagation of ultrasonic waves in eggs. Information regarding the characteristics of rapid wave propagation is very important in the process of evaluating and testing the quality of eggs because the rapid propagation of the wave reflects the quality of the eggs that are generally done destructively. This research is expected to be preliminary information in developing rapid and objective non-destructive technology for determining the fertility of poultry eggs using ultrasonic waves. The study reported the results of rapid measurements of ultrasonic wave propagation propagated on different types of eggs. This study used three types of eggs, namely poultry-chicken eggs, organic-chickens and ducks. Methods in the process of determining the characteristics of each egg using ultrasonic waves. Ultrasonic waves are waves that can propagate on certain objects, materials and components. The HC-SR04 module is used as an ultrasonic wave transmitter and receiver medium. Ultrasonic waves of 40 Khz are propagated to the surface of the egg and received by a receiver transducer placed facing each other. The distance between the egg and the HC-SR04 module is 5 cm and 10 cm. Distance and length of propagation time parameters are used as information to generate egg wave propagation speed values. The test process was carried out on 10 eggs, from each type. The observed age of the egg sample was 5 and 14 days. Based on the results of testing and calculations provide results that duck eggs have the highest speed value, while chicken eggs are the lowest. Keywords: Egg, Ultrasonic Waves, HC-SR04, Propagation Speed

The Utilization of Kepyar Castor Oil (Ricinus Communis) and Alumina Silica Catalyst in Alcoholysis Process Kiagus Ahmad Roni; Netty Herawati; Dian Kharisma Dewi; Sri Martini
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Castor oil is one of the vegetable oils that has not been used optimally. In the manufacture of biodiesel, vegetable oil is needed as a raw material. By using an aluminum silica catalyst which is a waste from the petroleum cracking process at PT. Pertamina RU III Palembang. This research aims to prove that the raw material for vegetable oil in the form of castor oil can be used as raw material for making biodiesel with the help of waste catalyst from the cracking process of Pertamina Unit III Palembang as a catalyst process and with the alcoholysis method. Based on the research that has been done, it can be concluded that castor oil can be used as raw material for making biodiesel using heterogeneous catalysts which are used as catalysts for fracturing crude oil at PT. Pertamina RU III, and with operating conditions of temperature 383oK, stirring speed of 300 rpm, ratio of oil and ethanol 5 mgek/mgek, and reaction time of 60 minutes. With the above operating conditions, the biodiesel conversion from the alcoholysis process was obtained at 94.08%. So that further research can be developed on the manufacture of biodiesel with castrol oil as raw material with the help of a catalyst reaction from cracked crude oil from PT Pertamina RU III Palembang.

Feasibility Study of Solar Power Plant in the Rectorate Building of Lampung University Using the Ongrid System Ocazy Harun; Khairudin; Despa Dikpride
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

This research aims to analyze the technical and economic feasibility aspects of the construction of solar power plants in the Rectorate building of Lampung University. Technical aspects are calculated how much electrical energy is generated, the number of components and systems used. Then the economic aspects are calculated using the net present value (NPV) and profitability index (PI) methods to determine profitable or detrimental investments in the future. The electrical energy generated by solar power plant is affected by solar radiation based on RetScreen data and the number of solar modules installed on rooftop buildings. The results of this study showed that the construction of solar power plant in the Rectorate building of the University of Lampung is feasible to built using ballast installation techniques and on-grid systems, based on economic aspect, it is feasible. Keywords: RetScreen, rooftop, on grid, Unila

Mechanical properties improvement of Self Compacting Concrete (SCC) using polypropylene fiber Vera Agustriana Noorhidana Noorhidana; Laksmi Irianti Irianti; Tas'an Junaedi Junaedi
Journal of Engineering and Scientific Research Vol. 3 No. 1 (2021)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

SCC (self-compacting concrete) is a type of concrete that can compact itself without the help of external compaction. Thus, it can fill all parts of the formwork that are narrow and have tight reinforcement. A problem that often arises in the use of SCC is the segregation of concrete mixture, which reduces the strength of the concrete. This paper presents the effect of polypropylene fiber on the fresh concrete workability, compressive strength, splitting-tensile strength, and flexural-tensile strength of SCC concrete. The variations of the polypropylene fiber added to the SCC mixture are 0%, 0.05%, 0.067%, 0.1%, and 0.15% of the concrete’s volume, with a water-cement ratio of 0.5 and 0.38 and dense-graded and gap-graded coarse aggregate. Each concrete variation is made into cubes (150x150x150 mm3) for the compressive strength test, cylinders (dia.150mm; height 300mm) for splitting-tensile test, and prisms (100x100x400 mm3) for the flexural-tensile test. The experiments were carried out with concretes with the age of 28 days. The result showed that, polypropylene fiber could reduce the segregation in the SCC concrete mixture. The optimal polypropylene fiber percentage is 0.05%, which could improve the compressive strength by 12.2%, the splitting strength by 17.7%, and flexural strength by 322.3% compared to SCC concrete without polypropylene fiber.

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Contact Name
Irza Sukmana

Contact Email
irza.sukmana@eng.unila.ac.id

Phone
+62721234234

Journal Mail Official
jesr@eng.unila.ac.id

Editorial Address
Faculty of Engineering, Universitas Lampung. Jl. Soemantri Brojonegoro No.1 Bandar Lampung – Indonesia. http://eng.unila.ac.id

Location
Kota bandar lampung,

Lampung

INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

Contact Name Irza Sukmana

Contact Email irza.sukmana@eng.unila.ac.id

Phone +62721234234

Journal Mail Official jesr@eng.unila.ac.id

Editorial Address Faculty of Engineering, Universitas Lampung. Jl. Soemantri Brojonegoro No.1 Bandar Lampung – Indonesia. http://eng.unila.ac.id

Location Kota bandar lampung, Lampung INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Irza Sukmana

Contact Email
irza.sukmana@eng.unila.ac.id

Phone
+62721234234

Journal Mail Official
jesr@eng.unila.ac.id

Editorial Address
Faculty of Engineering, Universitas Lampung. Jl. Soemantri Brojonegoro No.1 Bandar Lampung – Indonesia. http://eng.unila.ac.id

Location
Kota bandar lampung,

Lampung

INDONESIA