ISSN / EISSN: 02169495 / 25025325
Published by: Universitas Trunojoyo Madura
Total articles ≅ 219
Latest articles in this journal
Rekayasa, Volume 15, pp 151-157; https://doi.org/10.21107/rekayasa.v15i2.10137
White snapper (Lates calcarifer) is a type of seawater fish that is in great demand by the public. This study aims to determine the 48-hour LC50 value and the effect of using betel leaf extract on the health status of white snapper. This research was conducted in July 2020 which took place at the Sekotong Coastal Aquaculture Development Center (BPBPP), West Lombok Regency, West Nusa Tenggara. This research was conducted using experimental methods. This study used 5 treatments and three replications, to obtain 15 experimental units with doses of 0 ppm, 80 ppm, 90 ppm, 100 ppm and 200 ppm. Data analysis was performed using a linear regression test, namely probit analysis by testing the mortality of tested animals and calculated through statistical data using Microsoft Excel. The higher the betel leaf extract concentration, the higher the number of white snapper seed deaths. This happens because the betel leaf extract contains active antimicrobial compounds, but at high concentrations, it can poison the white snapper seeds. For further research, it is recommended to test the toxicity of betel leaf extract on the mortality of white snapper with variations in water quality.
Rekayasa, Volume 15, pp 137-142; https://doi.org/10.21107/rekayasa.v15i2.14135
Milkfish is one of the fishery commodities that are in great demand by the Indonesian people, where the obstacle to production decline is disease. Therefore, to prevent disease and treat diseases that attack fish, farmers use the antibiotic Chloramphenicol. However, the use of high doses of antibiotics will cause resistance to pathogenic bacteria and the residue left in the fish's body will have a negative impact on human health who consume them such as allergies, toxicity and even cause death in anemia sufferers which can progress to leukemia. This study aims to determine the length of downtime of the antibiotic Chloramphenicol on changes in residual levels in milkfish (Chanos chanos) aged 30 days decreased to a safe limit for consumption. Residual content test using ELISA at 450 nm wave. Based on the results of the study, milkfish fed with a mixture of chloramphenicol antibiotics at a dose of 1 ppm resulted in the highest residual value of 4.6375 ppb in the first week and a decrease in residue to 0.2363 ppb for 5 weeks. The stopping time of chloramphenicol antibiotics on changes in residual levels in milkfish (Chanos chanos) aged 30 days in treatment F (Milkfish fed with a mixture of chloramphenicol at a dose of 1g/kg of feed for a week, then fed without a mixture of chloramphenicol for 5 weeks) resulted in a safe limit for consumption.
Rekayasa, Volume 15, pp 204-214; https://doi.org/10.21107/rekayasa.v15i2.14580
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 247-252; https://doi.org/10.21107/rekayasa.v15i2.15130
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.
Rekayasa, Volume 15, pp 182-191; https://doi.org/10.21107/rekayasa.v15i2.13454
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 114-120; https://doi.org/10.21107/rekayasa.v15i2.14848
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.
Rekayasa, Volume 15, pp 275-282; https://doi.org/10.21107/rekayasa.v15i2.16420
Along with the development of naval technology, the roles, tasks and functions of the support of the Motorized Transport Battalion (Yon Angmor) have the complexity and dynamics of movement in supporting the implementation of Amphibious Operations, which are very important and have high traffic. In this study, conducted to identify and analyze organizational readiness, readiness in the field of Operations as an element of Satbanmin, and the readiness in the field of Logistics as an element of Satbanmin in the implementation of Amphibious Operations. The results of the measurement using SEM AMOS 23 software from the measurement model of the three variables of operational readiness, organizational readiness and logistical support readiness that affect administrative assistance support, that the operational readiness variable produces the highest value of 0.566. This means that the implementation of the operational readiness of the Yon Angmor in supporting administrative assistance in Amphibious operations can be carried out optimally and according to SOPs, despite having obstacles and problems in organizational readiness. So, to answer the existing problems, the Yon Angmor needs to plan the formation of an organization through organizational validation, as well as calculating risk management in supporting administrative assistance in the implementation of comprehensive amphibious.
Rekayasa, Volume 15, pp 121-128; https://doi.org/10.21107/rekayasa.v15i2.15057
An Ecological drainage becomes an application in this development project in the Kelapa Gading area. The drainage concept that is applied is a drainage system in which rainwater that falls on road surface runoff will flow directly into the water infiltration system and directly fill the ground surface water. Geologically, it can be seen that North Jakarta is an area with a fairly high ground water level (MAT), and has an average MAT elevation of 2 - 2.5 m. This study intends to determine the ability of this ecodrainage to reduce runoff/floods that often occur in areas with a fairly high MAL. What direct benefits can be felt in the use of ecodrainage in these flood-prone areas, thus making the basic reason for applying this ecodrainage. This study uses a dynamic systems approach. In the preparation of the dynamic system model, Powersim Studio Version 10 software will be assisted. The simulation results show that an increase in rainfall every year will provide an increasing flood potential. By using eco-drainage, it is felt that it is not optimal enough to reduce runoff in areas that have high MAT levels. However, this ecodrainage still provides broad sustainability benefits. The quantity of groundwater will slowly be filled up to the aquier layer through this ecodrainage. This step is considered to be able to help prevent the aquifer layer from being exposed and have an impact on the rate of land subsidence so that the potential for flooding will decrease.
Rekayasa, Volume 15, pp 199-203; https://doi.org/10.21107/rekayasa.v15i2.14155
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 253-259; https://doi.org/10.21107/rekayasa.v15i2.14153
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.