Rian Ade Pratama
@unmus.ac.id
Pendidikan Matematika/Fakultas Keguruan dan Ilmu Pendidikan
Universitas Musamus
EDUCATION
Magister Mathematics
RESEARCH INTERESTS
Modelling Population, Modelling Mathematics
Scopus Publications
Scopus Publications
Rian Ade Pratama, Martha Loupatty, Hariyanto Hariyanto, Wahyu Caesarendra, and Wahyu Rahmaniar
Ital Publication
Field and experimental data on aquatic ecosystem species show the effect of fear on changing prey demographics. The fear effect has an impact on aquatic ecosystems, such as species migration to settled areas. In this paper, the type of research described is a literature study. The cost effect assigned to the reproductive system of the prey population and the predation function response are given as Holling Type IV for research purposes to model the fear effect. Some research novelties, the equilibrium points are all shown in the population dynamics system model with an analysis of positive equilibrium. Positive and biologically realistic equilibrium points were analyzed using the Routh-Hurwitz criterion which is mathematically a local asymptotically stable. A pair of imaginary eigenvalues with a negative real part can increase population growth. An equilibrium region showing equilibrium for several parameters such as extinction, no predators, and two populations coexisting in a sustainable manner. The correlation and fluctuation of fear and fear cost were investigated to obtain a better model. The results of the numerical simulations show that the prey population becomes more daring to fight or fighting power with significant prey growth rates or high predator mortality rates. Doi: 10.28991/ESJ-2023-07-02-06 Full Text: PDF
R Pratama, Sufriadin, and S Widodo
IOP Publishing
Abstract Low rank coal is still less attractive to consumers because it is difficult to market and exploits. One of the parameters used for coal export or trading is calorific value. The disadvantage of low rank coal is the high moisture content. The high moisture content will cause problems in the process, especially if it is used as direct fuel and of course affects lower calorific value. The study aims to determine the characteristics of the coal samples used in the study, and to analyze the effect of mixing ratio and temperature on the quality of coal after being mixed with waste cooking oil. Further aim is to analyze the changing process of coal quality after the upgrading process. The study was conducted by mixing coal with waste cooking oil using the ratio of mixture ratio, temperature, and time. The comparison of coal before and after being mixed is seen from the results of proximate and calorific value analysis. The calorific value of the initial coal sample is 5,296.19 calories/gram and waste cooking oil is 7,080.33 calories/gram. The results showed that the mixing ratio (coal: waste cooking oil) 1:1, 1:1.5, and 1:2 using a temperature of 150°C obtained a calorific value of 6,733.02 calories/gram, 5,694.59 calories/gram, 5,295.45 calories/gram. The calorific value of a 1:1 ratio using temperatures of 175°C and 200°C is 6,965.51 calories/gram and 6,493.59 calories/gram. These results indicate that a 1:1 ratio with a temperature of 175°C is the most optimal condition for mixing coal with waste cooking oil.
E Munir, A Lutfia, A Hartanto, A A N Fazri, C Herdiyanti, R Pratama, O B I Sinaga, Z A Ramadani, and P Hasanah
IOP Publishing
Abstract Bioprospecting study of indigenous microbial community is still being approached especially for some microbial strains in bioremediation aspect. The objective of this study was to obtain a collection of indigenous bacterial and fungal isolates capable of growing on hydrocarbon medium. Soil samples were collected from Terjun Landfill located in Medan City, North Sumatra. Mineral salt agar medium supplemented with 10% (v/v) of hydrocarbon sources (diesel oil, pesticide, dye wastewater) was used to screen the microbial capacity in utilizing the hydrocarbon compounds as sole carbon source. Each isolate was categorized based on their growth performance or colony diameter on agar medium namely none (-), slow (+), moderate (++), and rapid (+++). The results obtained a total of 27 bacterial isolates and 6 fungal isolates. Majority of microbial isolates showed a better growth on pesticide medium than in diesel oil and dye wastewater which indicated their capability in converting the pesticide as nutrient. It is worthwhile to investigate the further application of our indigenous strains in contaminated areas in order to ensure the environmental sustainability.
Rian Ade Pratama, Maria F. V. Ruslau, and Dessy Rizki Suryani
EDP Sciences
This paper, the model considered is a predator-prey model for an exploited population. Predator and prey species in the offered concept have schooling characteristics. The characteristics of schooling are very similar to behavior in natural ecosystems. Based on the equilibrium analysis obtained five equilibrium points. The equilibrium point is the only one that satisfies the equilibrium model based on the Routh-Hurwitz criteria. Meanwhile, harvesting effort using the chosen equilibrium point was also calculated in the study. The principle of bionomic equilibrium is a method of showing the results of harvesting as a parameter control. Numerical simulations are also carried tor to validate the findings in the research discussion. Parameters taken from assumptions and references become important and critical references. Trajectories show a population of prey and predator one population that continues to be sustainable despite harvesting efforts. Meanwhile, different trajectories are shown by the population of two predators, which experienced a decrease in population growth. Harvesting attempts carried out on predator two continuously until a certain time will result in serious extinctions.
E Purwanto, Parjanto, and R A J Pratama
IOP Publishing
One of the impacts of climate change is drought stress. Drought stress is a severe threat to the present and future, especially black rice cultivation. An appropriate breakthrough needs to be created to get new varieties with drought-resistant and high-yielding character. This paper aimed to review the growth, yield, and get a genotype of black rice M4 generation from Boyolali and Bantul induced by 100 gamma-ray, with a drought-tolerant. The research was conducted at the screenhouse of Jati Village, Jaten, Karanganyar, Indonesia, from August 2020 until January 2021. The screenhouse is 200 meters above sea level, and the daily temperature ranges from 28.2 °-31 ° Celsius. The research design used was a field experiment research by planting the genotype of black rice M4 generation from Boyolali and Bantul induced by 100 gamma-ray. All black rice genotypes were given a moisture content of 50% field capacity as a drought treatment. The observation variables included growth, morpho-physiology, and yield. The data were analyzed descriptively and the comparison character of black rice M4 generation induced by 100 gamma-ray with the control using the T-test. The results showed that there was an effect of drought stress treatment on growth, yield, and there was genetic diversity between genotypes. The selection results showed that the black rice genotype from Boyolali and Bantul were better induced by 100 gamm-ray than the control genotype.
R A Pratama, M F V Ruslau, and Nurhayati
IOP Publishing
This article examines set a prey-predator population model system with structural stages. Development of a mathematical model of a sustainable population of a population of living things. Structure stages are formed in predator populations, namely immature and mature. The predation function that corresponds to the characteristics in the ecosystem is the predation process of Holling I. The interaction in the population model that is carried out analysis is the equilibrium value formed from the population model. There are eight equilibrium values that arise from simple simulations. The equilibrium is E 1(0,0,0,0), E 2(0, k,0,0), E 3(k,0,0,0), E 4(k, k,0,0), E 5(0,0,0, A 1), E 6(A 2,0, A 3, A 4), E 7(0, A 5, A 6, A 7) and E 8(A 8, A 9, A 10, A 11). However, only one equilibrium value is analyzed to obtain stability. Stability is seen by requiring four eigenvalues with the Jacobian matrix. As well as the chosen value is used to find the amount of harvest carried out. The linearization of differential equations is an alternative way in this study to obtain equilibrium values. Each equilibrium value has the characteristics and terms of its stability. The Routh-Hurwitz criterion becomes a condition of its stability characteristics. Meanwhile, exploitation efforts in the population are carried out to see the changes that occur. Harvesting carried out obtained harvesting business W = 0.01313666667. For the maximum benefit obtained π = 4.997259008. This advantage is the stability and sustainability of the ecosystem.
Nur Anisa Fitriani, Rama Aditya Pratama, Siti Zahro, Putranto Hadi Utomo, and Titin Sri Martini
AIP Publishing
R A Pratama, M F V Ruslau, D R Suryani, and E Meirista
IOP Publishing
M F V Ruslau, R A Pratama, and E Meirista
IOP Publishing
Y Somantri, D Wahyudin, R Pratama, T Nugraha, and M Husni
IOP Publishing
Abstract The need for practical equipment in the vocational high school (VHS) program is necessary. However, due to some difficulties such as the pricey of available training kit in the market caused that most student could not get appropriate practical work equipment. One of the important facilities is a training kit that encouraged the student to learn the Internet of Things. This study describes the design of the Internet of Thing Training Kit based on ESP-32 (IoTTK32). A set of IoT training module has been designed. Through research and development approach, the researcher has constructed a low-cost IoT trainer that can be used in industrial practical work. The results of the examination show that produced IoT kit could be used in formal practical work of industrial automation related to the industrial 4.0 evolution.
M F V Ruslau, R A Pratama, Nurhayati, and S Asmal
IOP Publishing
Edge Detection in an image is a process that produces edges of image objects, the purpose of which is to mark the parts that become detailed images to improve the details of blurry images, which occur due to the effects of the image acquisition process. Edge is defined as a change in the intensity of a large distance. Based on changes in intensity, there are three types of edges in digital images, namely, step edges, ramps edge, and noisy edge. On step edges where the intensity or gray value changes very fast The Gradient Method is able to detect better. On the ramp edge where the gray value slowly changes the Laplace method is able to detect better than the Gradient Method. On a noisy edge, the existence of noise in the image can bring up the other edges around the actual edge and can also shift the actual edge position. In this study, the authors conducted edge detection in the image by means of determining the right edge detection method to detect edges in noisy images. Noise is obtained by generating a Gaussian Noise in the image. The results showed that, without filtering the image, in noisy edge, the LoG operator was able to detect edges and reduce noise better than Canny. However, by selecting the right threshold that matches the σ (standard deviation), Canny also capable to provide good edge detection results.
R A Pratama, M F V Ruslau, Nurhayati, and S Laban
IOP Publishing
This paper developed mathematical models with structural stages from predators, namely small predators and adult predators. The predation function of adult predators follows the Holling I response function according to the characteristics in the ecosystem. In this model, an analysis of the equilibrium value and stability of the interior equilibrium value is carried out. Analysis of the stability of interior equilibrium values with the system linearization method at the value of equilibrium. Four equilibrium values were realized. Each equilibrium value has its own characteristics and conditions. The stability characteristics of equilibrium values were obtained using the Routh-Hurwitz criteria. Also, consider the eigenvalue of the characteristic equation in the Jacobi matrix. We also identify population changes made with cases that allow the ecosystem to work.
Nurhayati, R A Pratama, and M F V Ruslau
IOP Publishing
R A Pratama, S Toaha, and Kasbawati
IOP Publishing
This article deals with growth rate predator prey population model with stage structure for predator. The predator population is divided into two stages, mature and immature predator. Predation functional response in the model follows the Monod-Haldane type. Under consideration that the population is a valuable stock, the mature predator and prey population are then harvested with constant effort. This model is then analysed by found the equilibrium point and stabilities. There exists four equilibrium points and stability analysed is focused only for interior point. The stable interior point is related to the maximum profit problem. From the analyses we found that there exists a condition for the effort of harvesting so that the interior point is still stable and also obtained maximum profit.
R Pratama and W S Saputra
IOP Publishing
Grounding is one way to assure the safety of the hazards and the damage caused by the incurring currents. A grounding system, according to the General Electrical Installation Requirements 2000: 11, is a connecting point of an electrical circuit or a carrier not part of an electrical circuit with an earthing earth. If there is any isolation damage to a tensioned electrical installation, the danger of touch tension can be avoided as the current continues to flow into the ground through the earthing or grounding system. This aims to analyze or know the value of soil type resistance, which later can be analyzed and used as a reference for planning an earthing. In addition, this discussion aims to determine the effectiveness of earthing system improvements using additives substance. To perform the data collection, it is done by direct measurement method in the field by using earth tester and other supporting tools, and recording the result of measurement using earth tester.