Rekayasa
Journal Information
ISSN / EISSN
:
0216-9495 / 2502-5325
Published by: Universitas Trunojoyo Madura
(10.21107)
Total articles ≅ 195
Current Coverage
DOAJ
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Latest articles in this journal
Rekayasa, Volume 15, pp 182-191; https://doi.org/10.21107/rekayasa.v15i2.13454
Abstract:
Inverters with square waves and sinusoidal output signal waves have different efficiency values. The difference is very visible, especially when the inverter is used to drive an electric device that uses a motor. In a sinusoidal wave type inverter, electricity consumption will be more efficient than the use of a square wave type inverter. This study aims to determine the efficiency value of the square wave and sinusoidal inverter wave output in supplying the load. Square wave and sinusoidal inverters require a controller, the controller uses an Arduino Uno which acts as an SPWM signal generator and a square wave signal is used to drive the MOSFET with push-pulls topology. Based on the results of the inverter test to determine the efficiency, it shows that the inverter with sinusoidal output is 96.40% better, while the inverter with square wave output is only 83.34%, this test is carried out using a 50W LED lamp load.
Rekayasa, Volume 15, pp 175-181; https://doi.org/10.21107/rekayasa.v15i2.14154
Abstract:
The Indonesian Air Force is the main combat tool in the use of force to defend the sovereignty and territorial integrity of the Unitary State of the Republic of Indonesia as a unit in order to achieve guarantees for the safety of the nation and state. Indonesia only relies on 33 F-16 AM, BM, C and D aircraft, which are more than 30 years old. Then 16 Sukhoi 27 and 30 aircraft with almost 20 years of age as the main fighter aircraft. The limited number of aircraft spare parts as well as the limited types and number of guided missiles also caused the combat readiness of the F16 and Sukhoi 27 and 30 aircraft to be not optimal. The F5 Tiger fighter has fallen out of service in recent years and there has been no replacement to date. Likewise, the Hawk 100/200 aircraft which are more than 25 years old. the obligation of the Ministry of Defense to plan the purchase of fighter aircraft that will operate until 2030 and 2040. This research will use the Analytical Hierarchy Process (AHP) method to determine the choice of Combat Aircraft with predetermined criteria with the alternative choice of Dassault Rafale fighter aircraft from France, the Su 35 Russian-made and US-made F-15 EX aircraft. The highest data processing results are Dassault Rafale 63.7%, Su 35 20.3% and F-15 EX 16%. The result of the Multirole Combat Aircraft selection is that the Dassaut Rafale is selected. with an Inconsistency value of 0.04. This shows that the alternative calculation is still within the inconsistency threshold, which is <0.1. With the election of Dassault Rafale, it is hoped that the Transfer of Technology with PT. Indonesian Aerospace in order to increase the capability of the Domestic Defense Industry, especially the Air Force. later PT DI will be directly involved in the Maintenance, Repair, and Overhaul (MRO) process, including the preparation of the supporting infrastructure
Rekayasa, Volume 15, pp 253-259; https://doi.org/10.21107/rekayasa.v15i2.14153
Abstract:
The Indonesian Navy (TNI AL) is required to have a persistently broad Maritime Domain Awareness (MDA). In meeting its MDA demands, apart from using the KRI Radar, the Indonesian Navy needs to be supported by other airborne surveillance sensors and sensing satellites in outer space. For airborne sensors, Puspenerbal has been equipped with a fleet of maritime patrol aircraft (MPA) based on Casa NC 212-200 MPA and CN 235-220 MPA. However, all of these MPAs have a low detection capacity (<100 Km) and are not equipped with weapons to respond to threats on the surface or under the sea. For this reason, it is necessary to carry out research on the Long Range MPA requirement to support the tasks of the Navy with the aim of providing information and input to the Leaders in making decisions related to the plan to procure weapons and the strategic policies of the Navy to enforce defense and maintain security in the marine area of national jurisdiction. Indonesia This research will use the Analytical Hierarchy Process (AHP) method to determine the choice of maritime reconnaissance aircraft with predetermined criteria with alternative options, namely P-8A Poseidon, SAAB 6000 MPA, Kawasaki P-1, and ATR 72 MPA. The selected alternative was based on a combination of 3 criteria, namely P-8A Poseidon 58.3%, SAAB 6000 MPA 20.4%, Kawasaki P-1 14.4%, and ATR 72 MPA 6.8%. the result of the selection of the Tactical Reconnaissance Maritime Patrol Aircraft is that the P-8A Poseidon is the right alternative to choose. with an Inconsistency value of 0.06. This shows that the calculation of the alternative is still within the inconsistency threshold, which cannot be more than 0.1.
Rekayasa, Volume 15, pp 199-203; https://doi.org/10.21107/rekayasa.v15i2.14155
Abstract:
The Indonesian Navy is a military force owned by the State of Indonesia.One of the main components of the Indonesian Navy is a warship (KRI).The role of the KRI in the implementation of the peak training of the jaya fleet is to carry out various ship formations which will later be used during operations.This study was conducted to describe the increase in the learning outcomes of Marine Corps AAL cadets on the use of the Bridge Simulator.The type of research used is Pre-experimental with One Group Pretest and Posttest Design.The research subjects were AAL cadets Level III and Level IV Marine Corps.The results of this study indicate the learning outcomes of cadets.Paired t-test data analysis using SPSS 25 for windows showed sig (2 tailed) 0.00 less than 0.05, which means H0 is rejected so that there is a significant increase in learning outcomes.The use of the Bridge Simulator can improve the learning outcomes of Marine Corps AAL cadets.
Rekayasa, Volume 15, pp 204-214; https://doi.org/10.21107/rekayasa.v15i2.14580
Abstract:
Acne vulgaris or acne is a common inflammatory pilosebaceous condition that affects up to 90% of teenagers, begins during adolescent years, and often persists into adulthood. Acne vulgaris, especially on the face, has a major impact on the emotional, social and psychological health of patients. In treating acne, it is necessary to identify the exact type of acne. The manual method is considered less effective, so it is proposed an automatic method using a computer, which uses image processing techniques. This research was conducted to identify the types of acne on facial acne images. The methods used are K-Means Clustering for segmentation, Gray Level Co-occurrence Matrix (GLCM) for feature extraction, and Extreme Learning Machine (ELM) for classification. The dataset is 100 images and consists of 3 classes, namely Nodules, Papules and Pustules. Testing is done in two stages, namely testing 2 classes (Nodules and Papules), followed by testing 3 classes (Nodules, Papules and Pustules). Testing of 2 classes produces the highest accuracy of 95,24% and testing of 3 classes produces the highest accuracy of 80%.
Rekayasa, Volume 15, pp 158-163; https://doi.org/10.21107/rekayasa.v15i2.14152
Abstract:
Indonesian Navy flights as an integral part of the SSAT have several functions, one of which is to provide rapid logistical support. Based on considerations of function and mobilization capabilities, medium-sized military transport aircraft are the main choice in providing rapid logistical support. The advantages of this function and mobility also make military transport aircraft capable of carrying out additional tasks assigned to their guiding squadron, namely the 600 Air Wing Squadron. The additional tasks are Search and Rescue (SAR), Air Medical Evacuation (EMU) and VIP Flights. Currently, there are 11 elements of the NC212-200 aircraft owned by Puspenerbal, with a description of 7 active elements, 4 disposal processes. In 2017, Puspenerbal received the Beechcraft King Air 350i light transport aircraft, but several operational requirements were not met to carry out the main function as an element of fast logistics support provider, so this element was prioritized to carry out additional functions such as VIP flights. The results of the analysis using the Analytic Hierarchy Process (AHP) method with the help of the Expert Choice 11 Application show the weight of the criteria for selecting medium military transport aircraft, namely Navigation and Communication Equipment 46.4%, Short Take-off and Landing (STOL) Ability 31.7 %, Transportability 15.3%, and Flying Ability 6.7% with an Inconsistency value of 0.07. This shows that the calculation of the correspondent is still within the inconsistency threshold, which cannot be more than 0.1. While the order of priority for the alternative types of medium military transport aircraft from high to low is the CN 295 type 80.5% and the Alenia C27J Spartan type 19.5%. Based on this value, it can be seen that the CN 295 Medium Military Transport Aircraft is the right alternative to be chosen.
Rekayasa, Volume 15, pp 192-198; https://doi.org/10.21107/rekayasa.v15i2.15246
Abstract:
In solving the problem of abrasion and also protecting marine ecosystems, it is necessary to come up with an idea, namely a wave energy retaining structure that is also capable of being a habitat for marine biota. Therefore, in this study, artificial coral reefs were tested which are considered capable to solve these problems, plus those which at the same time rehabilitate damaged coral reef ecosystems. The artificial reefs model in this test is a hexagonal type with one layer arrangement. To get the success value (KD) of artificial reefs, it is seen from the percentage of damage caused by the influence of height and wave period. Then the KD value was calculated using the Hudson formula so that it was found that the hexagonal type artificial reefs had a KD value = 1.2.
Rekayasa, Volume 15, pp 143-150; https://doi.org/10.21107/rekayasa.v15i2.9799
Abstract:
Sorghum (Sorghum bicolor L. Moench) is a cereal crop that has the potential to be developed in Indonesia as a food, feed and industrial crop. Sorghum is a C4 plant that has the advantage of efficiency in hot and dry environments. Drought stress is one of the most limiting environmental factors for crop productivity worldwide, and can be caused by water deficits in the soil and in the atmosphere. On the decreasing leaf water status, the rate of CO2 assimilation and the conductance of stomata decreased rapidly. The CO2 concentration mechanism is able to saturate C4 photosynthesis under the relatively low intercellular CO2 concentration. In addition, CO2 photorespiration is likely to be repaired before it exits the bundle sheat cells. The effects of non-stomatal factors include reduced activity of photosynthetic enzymes, inhibition of nitrate assimilation, induction of premature aging, and changes in leaf anatomy. Photosynthesis in C4 plants, including sorghum, involves, others, the PEPC and Rubisco enzymes. Drought can also trigger oxidative stress, which is an environmental condition that has increased Reactive Oxygen Species (ROS) due to an over reduction of the photosynthesis process.
Rekayasa, Volume 15, pp 247-252; https://doi.org/10.21107/rekayasa.v15i2.15130
Abstract:
Characterization is the first step in breeding to obtain information about a plant's character. This study aims to determine the character of the hybrid melon candidate. The research was carried out in the experimental garden of the Agrotechnology Study Program, Trunojoyo University, Madura, from September to December 2021.The research used a randomized block design with treatment using six hybrid melon candidates (G1, G2, G3, G4, G5, and G6) and two comparison varieties (Envy and Action 434) with three replications. The results showed that Candidate G2 had higher values of fruit diameter, flesh thickness, number of seeds, and fruit weight than the two comparison varieties. The highest sugar content value is found in candidate G4, which is 13.80%. Heritability values in the broad sense of quantitative characters ranged from 0.62-0.98, and there were correlations between characters (positive and negative) between the observed characters.
Muhammad Baharudin Fahmi,
,
,
Harish Wirayuhanto
Rekayasa, Volume 15, pp 114-120; https://doi.org/10.21107/rekayasa.v15i2.14848
Abstract:
Generally, the purpose of artificial reefs is to rebuild naturally occurring coral reefs that have been destroyed. Without sacrificing the attractiveness of the protected beach, these manmade reefs functioned as new habitats for marine life and protected coasts by reducing wave energy. on the other side man-made artificial reefs can perform as submerged breakwaters, their ability to dampen incoming waves must be investigated. In this paper, the researchers present a new shape in the form of a hexagonal artificial reef. The wave attenuation performance index is calculated using the wave attenuation performance rating. The research focuses on the effect of structural height (h/d) on transmission wave value using a physical testing method on a scale of 1:10 at the wave flume of the Department of Marine Engineering, Sepuluh Nopember Institute of Technology, Surabaya. The test results indicate that the smallest transmission coefficient (KT) was produced on artificial reefs Configuration A-3 with the greatest submerged depth (h/d=0.75). The parameter results indicate that the greater the wave steepness (H/gT2) and the significantly larger the immersion depth (h/d), the better the wave reduction.