From the analysis of track lighting patents, the paper develops the concept of obtaining the normalized numerical values of functional word groups in each functional field, and then combines this concept with the modified DEMATEL-based Analytical Network Process (DANP) method and the modified Techniques for Order Preference by Similarity to an Ideal Solution (TOPSIS) method for application to track lighting in order to determine the priority of the functional improvement plans of different LED t...

Precious metal catalysts are mainly used as cata-lytic converters in motor vehicles and as petroleum refining and chemical industry catalysts. Platinum (Pt) group metals (PGMs) are mainly used as active mate-rials for catalysts, which contains palladium (Pd). This study used material flow as the framework theory and adopted methods such as review, telephone interviews, and manufacturer visits. The aim was to investigate the distribution of import, manufacture, export, and waste removal of relate...

A new ball polishing tool that can be mounted on the turret of a CNC turning center has been developed, to perform the precision surface finish of the STAVAX stainless mold steel. To simplify the conventional ball polishing with a slurry container, the lab-made polishing balls mainly composed of the NBR silicon rubber, the abrasive of aluminum oxide, and the silicon oxide have been developed and used. Five type of polishing balls with different abrasive grain sizes and concentration, from type A...

This research intricately explores the potential of Ultra-Dispersed nano-Diamond (UDD) additives in augmenting the lubrication performance of refrigeration oil within refrigeration cycle systems, with a spotlight on enhancing energy efficiency and wear resistance. The experiment bifurcates into analyzing RL 32H refrigeration oil with and without the UDD additive, unraveling that the latter, especially with a 300 ppm concentration, minimizes wear scar diameter. Consequently, implementing UDD addi...

Welding has broad applications. Nondestructive testing plays a crucial role in welding inspection. Every weld must be assessed for quality and the absence of defects, but such assessments must be done manually by an experienced operator. Thus, we formulated a deep-learning-based device that automatically conducts such assessments. We trained Welding Defects Net (WDNet) model with a small amount of images and adjusted the depth of convolutional layers and pooling layers during training. We also c...

Since the late 1980s, Three-Dimensional (3D) printing has evolved into a crucial technology for innovative product design, applications, and advanced manufacturing methods. Significant advancements have been made in printing, and researchers are continually working on controlling how materials and printed parts respond to external factors. The term "4D printing" was coined in 2013 to describe this concept. In 4D printing, models are printed with the intention of changing their shape or function ...

In this work, thermo-fluid dynamics of melt pools formed during Laser Powder Bed Fusion (LPBF) of a Scalmalloy® part was studied using Computational Fluid Dynamics (CFD) simulations. The formation of the melt pools was examined, and non-dimensional analysis of various flow and heat transfer driving forces was performed to justify the assumptions used in the model. The microstructure model predicted that the morphology factors increase with the energy density, due to thermocapillary effect and de...

Sustainable resources are one of the important aspects in maintaining the stability of nature. Nowadays, one of the major concerns is the development of recycled materials as additives or even substitutes for raw materials. This research aims to examine the possibility of using recycled materials in additive manufacturing (AM) in order to reduce the environmental impact. In this regard, oyster shells are considered as one of the wastes that can be utilized as a sustainable resource in the AM pro...

Cold Metal Transfer (CMT) welding produces very precise welds with the assistance of a welding robot. This technology can be used to weld joints between materials that have different mechanical properties. This research aims to improve production quality in welding by identifying optimal parameters from the machine, simultaneously reducing production costs through welding two different materials. The welding results are expected to achieve optimal strength and functionality. Emphasizing that wel...