cover
Contact Name
Hasan S Panigoro
Contact Email
hspanigoro@ung.ac.id
Phone
+6281356190818
Journal Mail Official
editorial.jjbm@ung.ac.id
Editorial Address
Department of Mathematics, Faculty of Mathematics and Natural Science, Universitas Negeri Gorontalo, Jl. Prof. Dr. Ing. B. J. Habibie, Moutong, Tilongkabila, Kabupaten Bone Bolango 96554, Gorontalo, Indonesia
Location
Kota gorontalo,
Gorontalo
INDONESIA
Jambura Journal of Biomathematics (JJBM)
ISSN : -     EISSN : 27230317     DOI : https://doi.org/10.37905/jjbm
The Jambura Journal of Biomathematics JJBM is a peer reviewed academic journal published by the Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Gorontalo, Indonesia. The journal is established with the vision of becoming a leading scientific publication in Southeast Asia and serves as a platform for researchers, academicians, and practitioners to publish original research articles and review papers. JJBM focuses on explaining complex biological phenomena through mathematical approaches and acts as a bridge between theoretical mathematics and the life sciences. JJBM has a broad and interdisciplinary scope covering various research areas. The journal welcomes high quality submissions involving mathematical analysis, computational modeling, and statistical methods to generate biological insights. The main areas include population dynamics, evolutionary dynamics, epidemiology, infectious disease modeling, systems biology, ecological modeling, and optimal control in biological systems. Through this scope, JJBM aims to support innovation in both mathematics and biological applications. To ensure scientific quality and originality, every submitted manuscript undergoes a single blind peer review process by experts in the field. The journal applies a strict policy against plagiarism and uses tools such as Turnitin to ensure originality. All accepted manuscripts are required to be prepared using LaTeX to maintain consistency and quality in mathematical formatting. JJBM is published quarterly in March, June, September, and December. The journal follows an open access policy, allowing all published articles to be freely accessed by the public. This approach supports wider dissemination of knowledge and increases the visibility and impact of published research. JJBM is committed to publication ethics and accessibility. The journal follows the guidelines of the Committee on Publication Ethics COPE. To support inclusivity, JJBM provides waiver options for article processing charges for authors from low and lower middle income countries.
Articles 12 Documents
Hemodynamic Modeling of Branch Retinal Artery Occlusion Involving Asymmetric Vascular Stenosis Basuki Widodo; Ni Putu Dewi; Yuni Muarifadila; Annisa Sulistyaningtyasa; Arif Fatahillah; Tri Rahayuningsih
Jambura Journal of Biomathematics (JJBM) Vol. 7 No. 1: March 2026
Publisher : Department of Mathematics, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjbm.v7i1.26

Abstract

The narrowing of retinal blood vessels, especially in conditions involving branch retinal artery occlusion (BRAO), can cause gradual and painless vision deterioration. Such vascular obstruction is also a contributing factor to eye stroke. This study investigates the influence of three asymmetric stenosis geometries, namely Bell--Cosine, Cosine--Overlapping, and Bell--Overlapping, on fluid flow characterized as Newtonian, incompressible, and steady. The mathematical formulation is derived from the Navier--Stokes equations, discretized using the Finite Volume Method (FVM) and solved through the Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) algorithm. Numerical simulations are performed in MATLAB with variations in stenosis length. The results demonstrate how different geometric shapes and stenosis lengths affect blood flow rate and pressure distribution. Among all configurations, the Bell--Cosine geometry consistently produces a flow rate above the normal threshold and a pressure level below the normal range for each stenosis length ($40\,\mu\text{m}$, $50\,\mu\text{m}$, $60\,\mu\text{m}$, $70\,\mu\text{m}$), compared with the other geometries. For every geometric arrangement, stenosis length plays a role in altering the flow behavior and pressure field around the constriction, while the peak velocity and peak pressure remain essentially unchanged.
The Hopf Bifurcation of the Dynamics of Behavior an Ecological Model Dian Savitri; Abadi; Riska Romadhonia; Nurul Ah; An Nisa Salsabila; Donna Kurniasih
Jambura Journal of Biomathematics (JJBM) Vol. 7 No. 1: March 2026
Publisher : Department of Mathematics, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jjbm.v7i1.27

Abstract

We conducted a dynamic analysis of an ecological model that describes the relationship between prey and predator detritivores. Assuming that predators require more food to survive, we applied the Beddington-DeAngelis functional response to examine local stability while taking the fear effect into account. The dynamics of the local stability properties of the equilibrium point ware examined. The two population extinction points, the prey population extinction point, and all population survival were the three points that we were able to determine. The analytical computations were supported by numerical simulations. Some numerical simulations are organized to show the impact of fear effects on prey, additional food on predator and predation using Beddington-DeAngelis on the dynamical behaviors of the model. The first numerical continuation of additional food parameters in the system solution indicated the presence of a Hopf bifurcation at $A = 0.625978$. The greater the supply of additional food, the extinction of the prey that the transcitical bifurcation was found at $A = 8.694143$. The bifurcation indicated that the change remains stable, becoming unstable at the interior equilibrium point and the other system solution. The Hopf bifurcation was also found at $f= 0.081119$ according to the second numerical continuation of the fear effect parameters, and $\beta=1.023308$. In addition, the appearance is that the transcitical bifurcation was found at $f= 2.088891$ and $\beta=3.362426$. We have demonstrated numerically the occurrence of Hopf and transcritical bifurcation driven by those three biological parameters.

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