Title: |
Identification of Scientific Knowledge in the Making Process of Batik Tanah Liek as Teaching Materials in Ethnoscience-Based Learning |
Authors: |
Media Roza, Nurhasnah, Minda Azhar, Festiyed, Milya Sari |
Source: |
International Journal of Latest Engineering Research and Applications, pp 01 - 11, Vol 10 - No. 01, 2025 |
Abstract: |
Minangkabau Batik Tanah Liek stands out among Indonesian batiks for its unique use of natural coloring materials derived from clay and specific plants. This study aims to identify and analyze the scientific concepts embedded in the production of Batik Tanah Liek for developing ethnoscience-based teaching materials. Employing a qualitative descriptive approach, the research utilizes the Educational Reconstruction Model (MER) to explore its ethnoscientific content. Data were gathered through interviews, observations, and field notes from three batik centers in West Sumatra. The findings reveal various science concepts in the processes of production, coloring, and waste management of Batik Tanah Liek. Indigenous knowledge of the local community was reconstructed into scientific concepts related to physics, chemistry, and biology, forming the basis of ethnoscience content. These findings demonstrate the potential to develop ethnoscience-based teaching materials suitable for elementary to high school levels. Such materials align with the Science Learning Outcomes of the Merdeka Curriculum, fostering the Pancasila Learner Profile. |
Keywords: |
Batik Tanah Liek, Ethnoscience, Indigenous Science, Natural Dyes, Scientific Reconstruction |
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DOI: |
10.56581/IJLERA.10.1.01-11 |
Title: |
Identifying Restrained Domination in the Corona of the Two Connected Graphs |
Authors: |
Yoshilo M. Bandoy, Grace M. Estrada, Margie L. Baterna, Mark Kenneth C. Engcot, and Enrico L. Enriquez |
Source: |
International Journal of Latest Engineering Research and Applications, pp 12 - 17, Vol 10 - No. 01, 2025 |
Abstract: |
Let G be a connected simple graph. A subset S of V(G) is a dominating set of G if for every v∈V(G)∖S, there exists x∈S such that xv∈E(G). An identifying code S of a graph G is a dominating set S⊆V(G) such that for every v∈V(G), NG[v]∩S is distinct. An identifying code of a graph G is an identifying restrained dominating set if every vertex not in S is adjacent to a vertex in S and to a vertex in V G ∖S. Alternately, an identifying code of a graph S⊆V(G) is an identifying restrained dominating set if N[S]=V(G) and < V G ∖S > is a subgraph without isolated vertices. The minimum cardinality of an identifying restrained dominating set of G, denoted by γrID(G), is called the identifying restrained domination number of G. In this paper, we initiate the study of the concept and give the domination number of some special graphs. Further, we show the characterization of the identifying restrained dominating set in the corona of two nontrivial connected graphs. |
Keywords: |
dominating set, identifying code, restrained dominating set, identifying restrained dominating set |
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Title: |
R-Strategies and Artificial Intelligence for the Circularity of Tools in Forming Technologies |
Authors: |
Stefan Lier, Andreas Schwung, Matthias Hermes, Michael Marré, Stefan Schweizer, Nathalie Weiß-Borkowski |
Source: |
International Journal of Latest Engineering Research and Applications, pp 18 - 21, Vol 10 - No. 01, 2025 |
Abstract: |
R-strategies can improve sustainability by circularity. At the same time, tool management in form-ing technologies is facing challenges in the transparency of tools conditions and in the efficiency of usage. Therefore, this work develops a framework which implements the R-strategies for forging tools and applies methods of artificial intelligence. Main research questions arising from the analysis are related to tool condi-tions, remaining lifetime, decision on the R-strategy, and scheduling. |
Keywords: |
R-strategies, artificial intelligence, circularity, forming technologies, tool management |
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DOI: |
10.56581/IJLERA.10.1.18-21 |
Title: |
Fluid Instability in Rotating Machines Controlled by Dynamic Stiffness |
Authors: |
P. Fraga, B. F. De Cal, B. |
Source: |
International Journal of Latest Engineering Research and Applications, pp 22 - 31, Vol 10 - No. 01, 2025 |
Abstract: |
In this work, a theoretical study of dynamic stiffness and its calculation in rotors that rotate in a fluid environment between them and the stator, such as oil-lubricated bearings, hydraulic pumps, steam or gas turbines, etc., is carried out, as well as its graphical representation with its effect on the stability margin. A practical case is also studied in a laboratory rotor-kit in which, by means of a frequency-controlled disturbance, this rotor is subjected to different rotational speeds to observe the phenomena of oil whirl and oil whip, as well as the stability margin in the approach and during these phenomena. These controls of the vibration obtained and of the values of the stability margin and the components of the dynamic stiffness will announce the induction of fluid instability in the vibration response of the machine. |
Keywords: |
Rotor dynamics, vibration, dynamic stiffness, whirl and whip. |
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DOI: |
10.56581/IJLERA.10.1.22-31 |
