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Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 689 Documents
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Glycosaminoglycans Content and Type II Collagen Localization in Chondrogenic Differentiation of Adipose-Derived Mesenchymal Stem Cells Induced by L-Ascorbic Acid 2-Phosphate Anggraini Barlian; Ni Luh Wisma Eka Yanti
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 1 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.1.7

Abstract

L-ascorbic acid 2-phosphate (LAA) is known to induce chondrocyte differentiation. The objective of this study was to analyze the potency of LAA in chondrogenic differentiation of adipose-derived mesenchymal stem cells (ADSC) by analyzing the glycosaminoglycans (GAG) content and type II collagen (Coll2) localization. ADSC was characterized using flow cytometry and cultured in media containing various concentrations of LAA (0, 25, 50, 100 μg/mL) for 2, 3 and 4 weeks. Coll2 localization was analyzed by immunocytochemistry (ICC) using a confocal microscope. The quantification of GAG was performed by Alcian Blue staining and calcium deposition by Alizarin Red S staining. The results showed that ADSC was positive for mesenchymal stem cell (MSC) markers. Coll2 was localized in the cytoplasm and showed increasing abundance along with the increase of the LAA concentration. The highest intensity of Coll2 localization was shown in LAA 100 μg/mL. ADSC in LAA induction medium showed higher GAG content compared to the control group (LAA 0 μg/mL) (p < 0.05). The highest calcium deposit was shown by LAA 25 μg/mL after 4 weeks of culture (p < 0.05) and it decreased at higher concentrations. In conclusion, LAA 100 μg/mL is considered the optimum LAA concentration for chondrogenic differentiation.
Artoindonesianin-E suatu senyawa baru turunan flavanon dari tumbuhan Artocarpus Champeden Euis Holisotan Hakim; Asep Aripin; Sjamsul Arifin Achmad; Norio Aimi; Mariko Kitajima; Lukman Makmur; Didin Mujahidin; Yana Maolana Syah; Hiromitsu Takayama
Journal of Mathematical and Fundamental Sciences Vol. 33 No. 3 (2001)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Sari. Suatu senyawabaru turunan flavanon, yakni 5,7-dihidroksi-2',4',6'-trimetoksiflavanon yang diberi nama artoindonesianin-E(1 ), telah ditemukan untuk pertama kalinya bersama-samad engan artokarpin (2) dan heteroflavanon-A (3) pada ekstrak benzena kulit batang tumbuhan Artocarpus champeden Spreng (Moraceae), suatu tumbuhan yang endemik untuk Indonesia, serta dikenal dengan narna Cempedak. Struktur molekul senyawa tersebut telah ditetapkan berdasarkan data fisika dan spekroskopi (MS, 1H dan 13C NMR).Artoindonesianin-E a New Flavanone Derivative from Artocarpus ChampedenAbstract. A new flavanone derivative, 5,7-dihydroxy-2',4',6'-trimethoxyflavanone named artoindonesianin-E (1) had been isolated for the first time, together with artocarpin (2) and heteroflavanone-A (3) from benzene extract of the tree bark of Artocarpus champeden Spreng. (Moraceae), a species endemic to Indonesia and locally known as Cempedak. The structure of this compound was elucidated based on physical and spectroscopic data (MS, 1H and 13C NMR).
Classification and Dynamics of Class of ξ(as)-QSO Izzat Qaralleh; Ahmad Termimi Ab Ghani; Hamza Abd Hamza Abd El-Qader
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 2 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.2.2

Abstract

The current study provides a new class of ξ(as)-QSO defined on 2D simplex and classifies it into 18 non-conjugate (isomorphic) classes. This classification is based on their conjugacy and the remuneration of coordinates. The current study also examines the limiting points associated with the behavior of trajectories for four classes defined on 2D simplex.
On Subspace-ergodic Operators Mansooreh Moosapoor
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 3 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.3.5

Abstract

In this paper, we define subspace-ergodic operators and give examples of these operators. We show that by any given separable infinite-dimensional Banach space, subspace-ergodic operators can be constructed. We demonstrate that an invertible operator T is subspace-ergodic if and only if T-1 is subspace-ergodic. We prove that the direct sum of two subspace-ergodic operators is subspace-ergodic and if the direct sum of two operators is subspace-ergodic, then each of them is subspace-ergodic. Also, we investigate relations between subspace-ergodic and subspace-mixing operators. For example, we show that if T is subspace-mixing and invertible, then Tn and T-n are subspace-ergodic for n∈ℕ.
Continuous-Like Linear Operators on Bilinear Spaces Sabarinsyah Sabarinsyah; Hanni Garminia; Pudji Astuti
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 2 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.2.8

Abstract

This paper introduces continuous-like linear operators on bilinear spaces as a generalization of continuous linear operators on Hilbert spaces. It is well known that the existence of the adjoint of a linear operator on a Hilbert space is equivalent to the operator being continuous. In this paper, this result is extended to the class of linear operators on bilinear spaces. It is shown that the existence of the adjoint of a linear operator on a bilinear space is guaranteed if and only if the operator is continuous-like.
Optimal Scheduling Policy for a Multi-upgraded Software System under Fuzzy Environment Adarsh Anand; Subhrata Das; Mohini Agarwal; V.S.S. Yadavalli
Journal of Mathematical and Fundamental Sciences Vol. 51 No. 3 (2019)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2019.51.3.6

Abstract

Many reliability growth models related to the concept of multi-upgrading have recently been proposed. This concept has helped software developers to develop a competitive edge over competitors by regularly introducing their software upgrades in the market at the optimal moment. The software reliability literature offers many different release-time policies, both under crisp and fuzzy environment. This paper presents a generic model of a multi-upgraded software system. The optimal scheduling policy for software under a fuzzy environment was determined. The proposed model was examined on a real-life failure data set of four software releases. The results obtained are encouraging.
Stratigraphic Model of East Biak Based on Magnetotelluric Data Alviyanda Alviyanda; Gusti Muhammad Lucki Junursyah; Prihadi Sumintadireja
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 2 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.2.7

Abstract

Biak Island is thought to have originated from the Australian Continental passive margin in the Mesozoic. This passive margin underwent tectonic collision to form the bedrock of Biak Island during the Paleogene. East Biak is covered by limestone, which is an obstacle to knowing the deeper stratigraphy. This study's aim was to identify the subsurface geology of the East Biak area based on rock resistivity values. Magnetotelluric (MT) surveying is a passive geophysical method that is able to interpret subsurface geology based on rock resistivity values at depths of up to 5 to 10 km. The MT measurements in East Biak used 25 measurement points. Cross-sectional variations in rock resistivity values generated from the MT measurements were used to identify rock types in the East Biak subsurface. Five rock units were identified. The East Biak stratigraphy model is dominated by carbonates, comprising two sequences, i.e. an Early Neogene sequence with a thickness of 1,000 to 3,000 m and a Late Neogene to Quaternary sequence with a thickness of 180 to 2,450 m. The unconformity between these two sequences is due to tectonic activity, which separated Supiori and Biak Island.
On Certain Aspect of Leaf Development in Aren (Arenga pinnata L) E.B. Hidajat; B.I. Utomo
Journal of Mathematical and Fundamental Sciences Vol. 10 No. 3 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Abstract. In Arenga pinnata fold formation leading to the establishment of the future pinnae occurs by differential growth. During the development the abaxial ridges grow more rapidly than the axial ones resulting in a bending of the ridges to the adaxial side while the direction changes from horizontal, to oblique vertical. This leads to a crowding up of the adaxial ridges adaxial to the rachis. A covering or haut develops then extension growth of the nonplicate lamina over the adaxial ridges mentioned there by uniting them in a composite structure. The two parts fuse along the central meeting line, forming one continuous covering. The huge tubular ligule is initiated at the fourth or fifth primordium. At the 7th primordium the ligule encloses all younger leaf primordial. Its highest growth activity is reached about 2 primordia before the sword and the maximum size is held by the primordium before the latter. Penetration of the ligule by the sword initiates its disintegration in a basipetal direction, stops adaxial to the petiole base but proceeds at a slower pace ventrally. 
Oscillation Theorems for Second Order Delay Equations Sahala Nababan
Journal of Mathematical and Fundamental Sciences Vol. 10 No. 3 (1976)
Publisher : Institute for Research and Community Services (LPPM) ITB

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Abstract

Abstract. Recently, oscillation criteria for certain second order delay differential equations have been substantially studied by [2], [3], [5], and others. In this paper, we generalize and extend some of their results to a more general delay differential equation of the type (r(t)y'(t))' + F (t,y(t),y(g(t))) = 0t ≥ α > 0
Optimal Parameters for Nonlinear Hirota-Satsuma Coupled KdV System by Using Hybrid Firefly Algorithm with Modified Adomian Decomposition Omar Saber Qasim; Karam Adel Abed; Ahmed F. Qasim
Journal of Mathematical and Fundamental Sciences Vol. 52 No. 3 (2020)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2020.52.3.7

Abstract

In this paper, several parameters of the non-linear Hirota-Satsuma coupled KdV system were estimated using a hybrid between the Firefly Algorithm (FFA) and the Modified Adomian decomposition method (MADM). It turns out that optimal parameters can significantly improve the solutions when using a suitably selected fitness function for this problem. The results obtained show that the approximate solutions are highly compatible with the exact solutions and that the hybrid method FFA_MADM gives higher efficiency and accuracy compared to the classic MADM method.

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