Journal of Applied Science and Technology

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INFLUENCE OF SUBSTRATE TEMPERATURE ON THE GROWTH OF Ti₄₅Ni₅₅ FILMS ON Ni SURFACES
Journal of Applied Science and Technology - Tập 47 - Trang 18-24 - 2025
Anh-Vu Pham, Trong-Linh Nguyen, Van-Ha Nguyen, Van-Thoai Nguyen, Quang-Chung Nguyen
Molecular dynamics simulations were employed to examine the influence of substrate temperature on the growth behavior of Ti₄₅Ni₅₅ thin films on stepped Ni(001) surfaces. Deposition cases were performed over a temperature range from 300 K to 1100 K under constant deposition energy and incident angle conditions. The results reveal that elevated temperatures facilitate interfacial intermixing, induce... hiện toàn bộ
#Film #Structure #Interface #Molecular dynamics
OVERVIEW OF STEGANOGRAPHY IN IMAGE
Journal of Applied Science and Technology - Tập 47 - Trang 59-65 - 2025
Nguyen Dinh Chien, Nguyen Duc Hau, Dao Van Hung
Steganography is a technique to hide secret data in a digital object such as video, image, audio, databases, DNA sequences, and text,... The main purpose of hiding information is to make it impossible for others to recognize, the robustness, and the amount of information hidden in the digital objects. This paper summarizes the steganographic techniques in digital images as well as some basic conce... hiện toàn bộ
#Steganography #Watermarking #image #PSNR #SSIM
ANALYSIS OF THE INFLUENCE OF LOAD ON THE TURNING PERFORMANCE OF SMALL TRUCKS CONSIDERING TIRE ELASTIC PROPERTIES USING NUMERICAL SIMULATION METHOD
Journal of Applied Science and Technology - Tập 47 - Trang 66-71 - 2025
Nguyen Van Thinh, Pham Thi Minh Hue, Nguyen Ngoc Tu, Nguyen Nang Minh
The maneuverability and safety of small trucks operating under the specific traffic conditions in Vietnam heavily rely on their turning performance. This research aims to develop and apply a singletrack planar dynamic model to quantitatively investigate the influence of cargo load (Q) on the turning characteristics of a small truck. The research methodology includes: (1) Developing and establishin... hiện toàn bộ
#Small truck #Turning #Dynamics #Numerical simulation #Cargo load
POSITION-DEPENDENT MECHANICAL PROPERTIES OF GRAPHENE IN AlCrFeCuNi HIGH-ENTROPY ALLOY DURING NANOINDENTATION
Journal of Applied Science and Technology - Tập 47 - Trang 32-38 - 2025
Dang-Luan Nguyen, Anh-Vu Pham, Dinh-Quan Doan
This study investigates the nanoindentation behavior of pure AlCrFeCuNi high-entropy alloy (HEA) and AlCrFeCuNi HEA/graphene composites through molecular dynamics simulations, with an emphasis on the effect of graphene embedding depth. Compared to the pure AlCrFeCuNi HEA, AlCrFeCuNi HEA/ graphene composites exhibit significantly improved mechanical response when graphene is positioned near the sur... hiện toàn bộ
#Graphene #high-entropy alloy #composite #indentation #MD simulation
STUDY ON THE EFFECT OF TEMPERATURE-DEPENDENT MATERIAL PROPERTIES ON 2D THERMAL SIMULATION OF PLASTIC INJECTION MOLDS
Journal of Applied Science and Technology - Tập 47 - Trang 25-31 - 2025
Van-The Than, Thi-Thao Ngo, Luyen The Thanh, Bui Khac Khanh, Nguyen Thi Lieu, Nguyen Danh Dao
Accurate prediction of mold temperature distribution is crucial for optimizing cooling design and ensuring product quality in injection molding. Numerous studies simplify simulations by assuming constant thermophysical properties of mold materials, overlooking their temperature-dependent nature and thus compromising accuracy. This work develops a 2D numerical heat transfer model in COMSOL Multiphy... hiện toàn bộ
#Injection mold #Heat transfer #Temperature-dependent thermophysical properties #COMSOL Multiphysics
EXPERIMENTAL INVESTIGATION OF WELDING PARAMETERS ON MECHANICAL PROPERTIES AND CHEMICAL COMPOSITION OF GMAW BUTT-WELDED PIPE JOINTS
Journal of Applied Science and Technology - Tập 47 - Trang 39-45 - 2025
Bui Khac Khanh, Than Van The, Nguyen Thanh Phu, Nguyen Danh Dao, Ngo Thi Thao
Gas Metal Arc Welding (GMAW) is widely used in manufacturing due to its high productivity and versatility. However, the quality of butt-welded pipe joints strongly depends on the selection of welding parameters. This study investigates the influence of welding current, voltage, and travel speed on the tensile strength, hardness, and chemical composition of S235JR pipe joints welded with GM-70S fil... hiện toàn bộ
#GMAW #butt-welded pipe joint #Taguchi method #tensile strength #hardness #chemical composition
THE EFFECT OF INDENTER SIZE ON THE DEFORMATION MECHANISM AND DISLOCATION MOTION IN CoCrFeNiCu HEA COATING ON Cu SUBSTRATE USING MOLECULAR DYNAMICS SIMULATION
Journal of Applied Science and Technology - Tập 47 - Trang 5-10 - 2025
Anh-Tuan Nguyen, Anh-Son Tran, Thanh-Nga Trinh, Van-Tuan Chu, Xuan-Hung Do, Thi-Thu-Huyen Tran, Ha-Linh Phan
In this study, we used molecular dynamics (MD) simulations to analyze the deformation behavior of CoCrFeNiCu HEA coatings on Cu substrates, with the radius of the indenter as a simulation variable. Employing dislocation extraction analysis (DXA) and common neighbor analysis (CNA), we evaluated the change in the deformation morphology of atoms subjected to stress shear strain > 0.1. At the same tim... hiện toàn bộ
#Molecular dynamics #CuCrCoFeNi HEA coating #Nanoindentation #Hirth dislocations
RESEARCH ON THE DESIGN AND EXPERIMENTAL TESTING OF A CINNAMON BARK DRYING DEVICE BASED ON THE PRINCIPLE OF REVERSE DRYING OF THE DRYING AGENT
Journal of Applied Science and Technology - Tập 47 - Trang 46-51 - 2025
Nguyen Dinh Tung
In Vietnam today, cinnamon bark after being harvested from the tree (peeled from the tree) will be dried by naturally drying under the sun. In addition to the natural drying method, no processing corporation has been seen using a dryer. When drying under the sun, it will depend a lot on the weather, moreover, it is easily covered with dust and affected by passing animals, etc. Therefore, the appli... hiện toàn bộ
#Cinnamon dryer #cinnamon drying process #drying kinetics of cinnamon #fixed bed dryer #cinnamon bark
ASSESSMENT OF THE STRENGTH AND ELONGATION PROPERTIES OF SILK AND NYLON SURGICAL SUTURES ACROSS DIFFERENT SUTURE CALIBERS
Journal of Applied Science and Technology - Tập 47 - Trang 77-82 - 2025
Hoang Thanh Thao, Ta Thi Diu
This paper studies the tensile strength and elongation at break of two common non-absorbable surgical sutures currently used in skin, soft tissue, and surgical wound suturing techniques: Silk surgical suture (natural surgical suture) and Nylon surgical suture (synthetic surgical suture) when changing suture sizes to 5/0; 4/0; 3/0; and 2/0. Tests were conducted under three conditions: before attach... hiện toàn bộ
#Silk surgical suture #Nylon surgical suture #tensile strength #elongation #suture size
GREY-BASED MULTI-OBJECTIVE OPTIMIZATION OF MACHINING FACTORS AFFECTING SURFACE ROUGHNESS AND MATERIAL REMOVAL RATE IN STAINLESS STEEL
Journal of Applied Science and Technology - Tập 47 - Trang 11-17 - 2025
Thi –Hoa Pham, Huu – Chuyen Vu
Currently, surface roughness and material removal rate (MRR) are two key indicators that directly impact both the service life of machine components and overall machining productivity. Achieving an optimal balance between surface quality and material removal efficiency through the selection of appropriate cutting parameters has become a crucial objective for manufacturers. This study investigates ... hiện toàn bộ
#Optimization #Surface Roughness #Material Removal Rate #Stainless Steel
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