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Journal of Engineering and Scientific Research (JESR)
Published by Universitas Lampung
ISSN : 26850338     EISSN : 26851695     DOI : https://doi.org/10.23960/jesr.v4i1.78
Core Subject : Science, Engineering,
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 90 Documents
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Soil Quality Assessment in Relation to Food Crop Productivity to Support Agribusiness-Based of Dry Land Management by Scoring of Soil Quality L M Rachman
Journal of Engineering and Scientific Research Vol. 2 No. 1 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1277.136 KB) | DOI: 10.23960/jesr.v2i1.38

Abstract

To support Indonesian’s food self-sufficiency program, more quantitative and accurate data are required on the character of soil data needed, which can be more easily understood, practical and suitable for crop selection as well as for the right fertilizer recommendations to support the agribusiness development, implementation and operation. The purpose of this research is to develop and assess soil quality in relation to the productivity of major food crops by using Soil Quality Score Plus (SQS Plus) to support agribusiness-based management of dry lands. The use of SQS for assessing soil quality in principle determines the weighted average score obtained from the score of each selected key parameter multiplied by its weight. The SQS for the 36 locations observed varies from 2.36 (low) to 4.12 (high). SQS Plus adds letter(s) after a score to indicate the limiting factor(s) of soil ecosystem. The most limiting factor is low carbon organic content (72.2 % from the 36 locations observed), followed by low P availability (58.3%), and low total organic N (41.7%). Data of correlation between SQS and crop productivity is not good as expected.  Crop growth and crop production are not only determined by soil quality and its limiting factors.   Keywords: Crop productivity, dry land management, soil limiting factors, soil quality assessment, Soil Quality Score
Web-Gis Application Of Agricultural And Food Crop Management Salahuddin Salahudin; Husaini Husaini; Anwar Anwar; Zulfan Zulfan
Journal of Engineering and Scientific Research Vol. 2 No. 1 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1191.498 KB) | DOI: 10.23960/jesr.v2i1.39

Abstract

This paper discusses web-based applications in the agricultural and food crops sectors in North Aceh district, Aceh Province, Indonesia. The agricultural and food crops sector is a mainstay sector of the people of North Aceh and local governments to move the economy and income of the local community. There are several superior agricultural products and food crops including rice, corn, sweet potatoes, green beans, long beans, cassava and potatoes. The North Aceh Government does not have sufficient applications to manage agricultural sector products. The research objective is to realize the independence of local food in order to support the national food security program. The mechanism used to design and make agricultural and food crop web applications starts from application design, application construction/coding, application testing and implementation system. After testing the web application by doing black box testing-white box and GUI testing to find out the side of the application display, application behavior and application durability. The results showed the application accuracy, stability and durability of the application reached 97.4%. The application web-based of agriculture and food crop management has been running as it should for mapping/GIS of superior agricultural commodities and GIS potential locations of agriculture and food crops in North Aceh.   Keywords: Applicaton, GUI, Black Box Testing, GIS
Addressing Semantic Interoperability, Privacy and Security Concerns in Electronic Health Records Arjmand Naveed; T Sigwele; Yim Fun Hu; M Kamala; Misfa Susanto
Journal of Engineering and Scientific Research Vol. 2 No. 1 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1022.516 KB) | DOI: 10.23960/jesr.v2i1.40

Abstract

The use of Electronic Health Records (EHR) in healthcare has the potential of reducing medical errors, minimizing healthcare cost and significantly improving the healthcare service quality. However, there is a barrier in healthcare data and information exchange between various healthcare systems due to the lack of interoperability. Also, with the implementation of EHR system, there are security and privacy concerns in the storage and transferring data entities.  The healthcare interoperability problem remains an issue of further research and this paper proposes a semantic interoperability framework for solving  this problem by allowing healthcare stakeholders and organizations (doctors, clinics, hospitals)using various healthcare standards to exchange data and its semantics, which can be understood by both machines and humans. Moreover, the proposed framework takes into consideration the security aspects in the semantic interoperability framework by utilizing data encryption and other technologies to secure the communication for the EHR information while ensuring real time data availability.                                                                                                  Keywords:. Semantic interoperability; Interoperability standards; Electronic Health records(EHR); Artifical Intelligence Techniques. Natural Language Processing (NLP), Word2Vec, skip gram, CBOW
Value Chain Analysis of Cassava (Manihot Esculeta) in Toba Samosir Regency, North Sumatera, Indonesia Rut Tambun; Yosef Manik
Journal of Engineering and Scientific Research Vol. 2 No. 1 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (884.992 KB) | DOI: 10.23960/jesr.v2i1.41

Abstract

The purpose of this study is to map out the value chain of cassava (Manihot esculeta) and to measure the extent to which the cassava commodity in Toba Samosir Regency, North Sumatera, Indonesia, could affect the economics of the relevant stakeholders. This study employed the value chain mapping analysis method to map out the existing supply chain models. Data and information have been collected using semi-structured interviews to selected sample that represent the stakeholders’ population along the cassava supply chain in Toba Samosir Regency. The stakeholders have been identified using snowball technique. SWOT analysis was employed to deploy policy strategy in improving the cassava benefit for the stakeholders. From the study, we obtain three models of supply chain of cassava, namely: (i) direct sale of cassava root to consumer model, (ii) cassava-based food model, and (iii) tapioca starch model. The margins of each node for each supply chain were estimated. The value chain map reveals that the value engineering of cassava commodities is not optimal, in which the final products produced by all models of supply chain are far below the potential possible value. We finally recommended some value-added improvement strategy; for example, diversifying the product of cassava derivative that is more valuable that is higher-grade tapioca flour and modification of cassava flour.   Keywords: Value Chain Analysis, Cassava, North Sumatera.
Optimizing Groundwater Aquifers Potential in The Development of Irrigation Wells for Agriculture Using Geo-Electrical Method Rustadi Rustadi; O. T. Purwadi; I. G. B Darmawan
Journal of Engineering and Scientific Research Vol. 2 No. 1 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1530.886 KB) | DOI: 10.23960/jesr.v2i1.43

Abstract

The identification of shallow groundwater aquifers is demanded to sustain the balance of utilization in agriculture and anticipate frictions that can occur due to the overlapping usage of groundwater resources. This study is aimed to identify the potential of groundwater resources based on the thickness and depth of the groundwater aquifer. Geoelectric resistivity methods have done with vertical electrical sounding (VES) and horizontal profiling techniques (2D mapping). The VES data acquisition was carried out with a Schlumberger array while 2D mapping by alpha Wenner array. Inversion results of vertical electrical sounding (VES) show that groundwater resistivity values in sedimentary rocks ranged from 1 to 100 ?m and in igneous rocks between 0.5 - 150 ?m. The results of 2D Resistivity Mapping also show that shallow aquifer depth ranged from 1 to 5 m with a thickness ranged from 15 m to more than 70 m. Meanwhile, bedrock depth ranged from 20 to 150 m with a pattern deeper to the west. Furthermore, the potential of groundwater aquifers in the development of irrigation wells for agriculture should be carried out in the western part of the study area.   Keywords: Groundwater, Shallow Aquifer, Rock Resistivity, Irrigation Well, Geo-Electrical Sounding.
Enhancing Visual Abilities in Solving Mathematics Problems Mohamad Rif’at
Journal of Engineering and Scientific Research Vol. 2 No. 1 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (985.005 KB) | DOI: 10.23960/jesr.v2i1.44

Abstract

This research is an experiment of categorizing visual abilities by representations of a solving problem through class experiment. The research is to investigate, explore, and enhance geometry thinking in solving mathematics problems presented visually. The tasks are cognitive strategies that rely on the visual representations and the genesis of the abilities with the assumption that the performance requires the manipulation of the visual representations. The model of the research developed from the students’ imagination of a visual problem or situations for accomplishing the solution and called binocular rivalry. The data are of interconnection for promoting visual abilities or senses, as the flexibility of thinking and the likelihood of having representations available in prior knowledge. The data analyzed by categorizing according to the visual abilities and by Control Chart of Attributes. The results are: 80% of the visual abilities are nonconforming index; the variation of visual representations is high in nonconforming index, but the depth struggle by the subjects and 70% select the general geometric figures that recognized. The conclusions are comprehensive, and the visual representations are nonconforming index, and the visual senses enhance in all categories.   Keywords: Visual representation; Visual ability; Categorize visual skills; Geometry thinking; Cognitive strategy.
Simulation and Modeling Time Response of Double Carrier Avalanche Photodiodes Helmy Fitriawan
Journal of Engineering and Scientific Research Vol. 2 No. 2 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1174.934 KB) | DOI: 10.23960/jesr.v2i2.45

Abstract

Avalanche photodiodes (APDs) is a particularly sensitive semiconductor device that employs the photoelectric effect to convert light into electricity. APDs can be used in some typical applications, i.e. imaging, optical fiber communications, range finding, laser scanners and laser microscopy. In APDs, avalanche multiplication occurred due to impact ionization when the devices operating at high electric fields. Unfortunately, avalanche multiplication decreases the time response of APDs. The time response of an APD can be characterized by its current response which is represented by the mean current as a function of time. This paper discusses a method to estimate the time response of double-carrier multiplication avalanche photodiodes (APDs). The model, called The Random Path Length (RPL), generates random path length for a carrier to impact ionize and takes account of dead space distance into the calculation. Dead space distance is the minimum distance to travel by a carrier to gain the adequate energy to start first ionization. The RPL is applied into an ideal structure which is assumed has a dimensionless multiplication length, w = 1.0, with electrons and holes moving in constant speeds, ve = vh = v, for various dead spaces distances, d*. In this research, a computer code is generated to compute the mean impulse response, i(t), and the standard deviation, s(t), of APDs all as a function of time.
Corrosion Analysis of Oil Drilling Pipes On Mobile RIG 42.3 N1500 E In Prabumulih Elfidiah, Kiagus Ahmad Roni, Agustriono
Journal of Engineering and Scientific Research Vol. 2 No. 2 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1257.081 KB) | DOI: 10.23960/jesr.v2i2.47

Abstract

In the oil, gas, and geothermal drilling industry, the use of drill pipe is very important to increase the length of the drilling depth. Problems that are often encountered in drilling pipes such as broken, bent, and leaking drilling pipes, one of which is caused by corrosion. Corrosion is the degradation of materials (usually metals) due to the electrochemical reaction of these materials with their environment. This study uses a specimen of carbon steel pipe type G105 where this pipe is used in field drilling. From the results of research on the corrosion rate test, the corrosion rate value is obtained in mm / month. This study took the first drill pipe sample starting from May 2018 to October 2019 with the same sample code with a sample size of 69 pipes. Based on the research results, the largest corrosion rate value in the drilling pipe from May 2018 to October 2019 is 0.12 mm / month. In the research, the smallest remaining life of the drilling pipe is 6.2 months. Of the 69 drilling pipes studied, there were 11 drilling pipe samples that had decreased quality to class 2. Based on the results of Scanning Electron Microscopy photos, the condition of the pipe surface morphology after corrosion and there was surface damage after corrosion.
Improvement of Hardness of Hydroxyapatite by the Addition of Silica from Tin Tailings Fitri Afriani; Evi J; Zaitun; Yuant Tiandho
Journal of Engineering and Scientific Research Vol. 2 No. 2 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1041.366 KB) | DOI: 10.23960/jesr.v2i2.48

Abstract

The application of bone scaffolding in bone therapy is an alternative solution developed in bone tissue engineering technology to avoid bone donors' scarcity. The main requirement for a material that can be used as a scaffold is that it is biocompatible. Hydroxyapatite is a calcium phosphate ceramic that is often used as the primary material for scaffolding because it has good biocompatibility properties. However, like most ceramics, hydroxyapatite has low mechanical properties. In this study, we synthesized hydroxyapatite from cockleshell waste. To improve hydroxyapatite's mechanical properties (hardness), we added silica from tin tailings to hydroxyapatite. Through the analysis of the x-ray diffraction (XRD) pattern, it was found that hydroxyapatite was successfully synthesized from cockleshell using the co-precipitation method. Analysis of the diffraction pattern of tin tailings also shows that most of the crystals comprising tin tailings sand are silica in the ?-quartz phase. The addition of silica to hydroxyapatite followed by compaction and sintering at a temperature of 800 ? did not produce a new crystal phase. The addition still has a diffraction pattern consisting of a combined XRD pattern of hydroxyapatite and silica. Based on the hardness test using the Vickers hardness method, it is known that the addition of silica can increase the hardness of hydroxyapatite.
The Rheological Characteristics of Dammar Mata Kuching Chairul Umam, Azhar, Elida Purba
Journal of Engineering and Scientific Research Vol. 2 No. 2 (2020)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1107.399 KB) | DOI: 10.23960/jesr.v2i2.50

Abstract

Rheology is already defined as the science of flow and deformation of matter. The purpose of rheology is to look at the relationships between stress and deformation of the material-marterial (non-Newtonian) in order to explain its mechanical properties. One of the ingredients that is often used as a basic material for making products is dammar. Dammar is a general term used to name a material in the form of natural resin which is the result of exudation of trees from the Dipterocarpaceae and Burseraccae families. This research uses raw materials dammar and toluene which are used to make a solution of dammar with the proportion of dammar: toluene, namely 50: 50, 40: 60, 35: 65, and 30: 70. Then the rheological analysis is analyzed by measuring the viscosity value, the shear rate. , and also its shear stress. The viscosity value increases with the greater the shear rate and the value of n (Flow Behavior index) is> 1, indicating that a solution of resin is a fluid with a type of dilatan fluid.   Keywords: dammar, deformation, rheology, shear rate, shear stress.

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