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Introduction
Publications
Publications (345)
The aquaculture industry encounters substantial obstacles, including organic pollution, oxygen insufficiency, and elevated levels of ammonia and carbon dioxide. Aeration systems are employed to enhance the process of oxygen transfer and promote circulation. The Lily impeller, a newly developed technology, has demonstrated reduced energy consumption...
Anterior cruciate ligament (ACL) injuries are among the most common knee injuries. Surgery is often needed when an ACL injury occurs to restore function to the knee. One of the most popular techniques for ACL grafts currently is the use of interference screws. This review summarizes the current state-of-the-art interference screw material, manufact...
Everyone agrees that there must be some contact for wear, and extreme contact pressures beyond the yield limit will cause overload damage, making material failure worse. But different pieces of evidence have led to different conclusions for the middle range of contact pressures. Even though there are advanced modeling techniques, many researchers s...
BACKGROUND
The four components that make up the current dual-mobility artificial hip joint design are the femoral head, the inner liner, the outer liner as a metal cover to prevent wear, and the acetabular cup. The acetabular cup and the outer liner were constructed of 316L stainless steel. At the same time, the inner liner was made of ultra-high-m...
Laparoscopic surgeons can experience musculoskeletal disorders due to standing for long periods during surgical procedures. Surgery chair can help laparoscopic surgeons in overcoming these problems so that they carry out surgical procedures in a sitting position. However, the surgery chairs currently on the market use a hand-controlled pedal for th...
Based on several references, Asians carry out several daily activities that are different from Westerners, which require a greater range of motion. Because of that, a dual mobility (DM) implant was created that was adapted to the activities of Asian people. One of the factors that might shorten the life of a hip implant is wear. Simulations of wear...
In contact mechanics analysis, load, deformation, friction, and residual stress are important variables that need to be considered to understand the behavior of materials under contact for application in biomedical industry. This study investigated the effect of load, diameter ratio, and friction coefficient on the contact behavior between two hemi...
Introduction: This study presents a novel weighted vest integrated with vibrotactile stimulation for deep pressure therapy. Following the principles of Morrison's research, we assessed its effectiveness in calming users with four distinct vibration patterns. Method: Ten male participants without ASD history, aged 19-25 and weighing 48-73 kg, provid...
This paper experiments with stainless-steel AISI 316L substrate pre-treatment techniques in preparation for hydroxyapatite (HAp) flame spray coating. The mechanical, chemical, and combination pre-treatments were compared for the coating thickness and layer adhesion of the HAp to understand the influence of roughness on the layer adhesion of the fla...
Musculoskeletal disorders frequently occur in various types of work, including laparoscopic surgeons. The surgeon profession is classified as a high-risk occupation and may have musculoskeletal disorders. Surgeons who suffer from these disorders experience illnesses ranging from mild to severe because the muscles often receive long-term static load...
TRIZ, also known as the theory of innovative problem-solving, has garnered attention from several proponents who advocate its merits as a systematic technique or toolkit that offers a rational framework for fostering creativity in pursuing innovation and creative problem-solving. The broad range of tools and procedures used in the TRIZ-based innova...
The single mobility bearing as a previous bearing design of total hip prosthesis has severe mobility constraints that can result in dislocation during Muslim (people who follow the Islam as religion) prayer movements, specifically shalat that requires intense movement. There are five intense movements (i.e., bowing, prostration, sitting, transition...
The term “contact area” refers to the total surface area of two entities in direct physical touch. When discussing an artificial hip joint, “contact area” refers to the surface area of contact between the components of the artificial hip joint (ball and cup) positioned inside the patient. Several methods can be used to figure out the contact area o...
This research focuses on enhancing the control system of the commercial inflatable vest to optimize pressure regulation for deep pressure therapy (DPT) in children with autism spectrum disorder (ASD). The main goal is to provide a safe and reliable DPT experience with calming effects. The proposed control system incorporates a feedback loop mechani...
In the practice of biodiesel storage tanks, there are questions about their long-term viability for handling and storage. This study examined the effects of biodiesel blends containing B0, B30, B40, and B100 products on the corrosion resistance of carbon steels graded AISI 1020 and AISI 1045. Static corrosion tests for 168 hours at 25°C were perfor...
The running-in process is considered an essential aspect of the comprehensive wear process. The phenomenon of running-in occurs during the initial stages of wear in the prosthetic hip joint. Within the field of tribology, the running-in phenomenon of the hip joint pertains to the mechanism by which the contact surfaces of the artificial hip joint c...
Highlights: • The role of mechanical contact on deep touch pressure (DTP) has been studied • Contact area and the determination of pressure magnitude affect the success of deep touch pressure (DTP) therapy • Contact mechanics aspects need to be considered in order to enhance deep touch pressure (DTP) therapy effectiveness Abstract The art of touch...
Additive manufacturing (AM) is a sustainable manufacturing approach because it can lower emissions and have a lower negative impact on the environment. 3D-printed interference screws from poly-lactic acid, eco-friendly filament, by fused deposition modelling (FDM), were fabricated with different process parameters. The most popular technique for re...
This study aimed to determine the effect of preheating AISI 316L metal substrate on the adhesion strength of the hydroxyapatite (HA) layer derived from green mussel shell waste deposit by the flame spray method. The deposition experiment was carried out in a spray gun with a distance of 10 mm with preheat of 200 ° C, 400 ° C, and 600 ° C. A sample...
The study investigated the efficiency of generating precipitated calcium carbonate (PCC) by chemical dissolution and carbonation from extracted natural asphalt solid waste residue. This residue was then further transformed into calcium carbonate through a series of steps involving calcination at a temperature of 900 °C for 5 hours and ammonium salt...
The use of biogenic waste for multipurpose materials has started to be encouraged in the current decade to support the world’s environmental sustainability campaign. Biogenic calcium phosphate-derived materials are potential biomaterials because of their similar properties to human bone. This paper used hydroxyapatite (HAp) powder derived from gree...
Waste crab shells (CS) have the potential to mineralize CO 2 , yielding precipitated calcium carbonate (PCC) powder feedstock for use in the synthesis of monocalcium phosphate monohydrate (MCPM) in an acidic condition by partial neutralization of phosphoric acid at 90 °C and varying times (30–120 min), followed by evaporation of the water at 100 °C...
Journal bearing is a machine element that is used to maintain the continuous rotation of the shaft on its axis. The rising demand for efficient and economical journal bearing applications has resulted in increased demand for high-speed machines. An increase in engine speed raises the distribution of pressure, temperature, and vapor volume fraction....
Background
High contact stresses involving the hip have been shown to increase the risk of developing hip osteoarthritis (OA). Although several risk factors have been identified for OA, a holistic approach to predicting contributed factors towards increased hip contact stresses have not been explored. This study was conducted to comprehensively und...
Mesh model Element size FEA Contact pressure Von Mises Artificial hip joint The Finite element method (FEM) was used to determine the most efficient meshing model and the appropriate element size for finite element analysis of the dual-mobility hip joint. The static simulation was carried out in dry conditions and under a load of 2,332 N, the highe...
Deformation Running-in wear Hard-on-hard Bearing Total hip prosthesis Since polyethylene wear particles reduce the lifetime of the total hip prosthesis in hard-on-soft bearing couples, hard-on-hard applications are more promising. Running-in wear evaluation can be the basis for determining the material selection for the hard-on-hard bearing couple....
Humans carry out various activities in everyday life, where the most frequently performed are normal walking activities. Loading under this human activity has been adopted by several studies for developing hip joint replacement in vivo or in vitro. The presented research performs a von Mises stress investigation on CoCrMo-on-CoCrMo bearing in norma...
3D Printer is a breakthrough in manufacturing technology based on a layer-by-layer printing process through various raw material input techniques. One of them is additive manufacturing technology, namely 3D Printing, widely used in the medical device industry. This study aims to obtain parameters that affect the mixture of polylactic acid and polyc...
The use of CNC milling machines in the manufacturing industry contributes significantly to producing according to the shape desired by the consumer. It is, however, possible to determine the product quality from the amount of surface roughness and optimal processing time. UHMWPE acetabular cup is a product component that requires excellent machinab...
The study of contact mechanics is rapidly expanding in scope and importance. However, most studies of spherical do not spend significant time comprehensively analysing PEEQ, especially in the effect of friction coefficient and diameter ratio. This study aims to introduce comprehensive research examining diameter ratio and friction coefficient influ...
In this study, the application of the computer-aided reverse engineering system (CARE) to the novel design and manufacture of a comfortable insole for a clubfoot patient is presented. The Taguchi method (TM) and response surface methodology (RMS) were used to predict the machining time of the orthotic boot insole during both computer-aided manufact...
The current laboratory experiments investigated the corrosion resistance of carbon steel in artificial seawater (ASW) using the steel coupons hanging on a closed glass reactor of ASW with volume-to-specimen area ratios ranging from 0.20 to 0.40 mL/mm². These coupons were immersed in ASW for varying time durations (7 and 14 d) at room temperature wi...
In daily human activity, normal walking becomes the most common performed activity. For this reason, many researchers have been adopted normal walking condition to giving actual loading on many hip implants studies. Our recent article intends to conducting deformation study in hip joint bearing during normal walking activity using numerical analysi...
Utilizing a non-Newtonian lubricant, such as Bingham plastic fluid, in a hydrodynamic journal bearing affords the opportunity to actively alter the operating performance of the bearing. In this work, the main purpose is to explore the behavior of the journal bearing lubricated by Bingham plastic using the computational fluid dynamics (CFD) method c...
Normal walking has become the most commonly performed activity in daily human life. Many researchers have adopted the normal walking condition to study the bearing of total hip arthroplasty using realistic loads. Our research aims to evaluate contact pressure in bearing under normal walking conditions using the finite element approach. The 2D model...
Various studies of total hip arthroplasty from many existing researchers have examined implant user external factors from implant user. Unfortunately, internal factor of implant user is not profoundly discussed. Our current study aims to understand von mises stress in CoCrMo-on-CoCrMo of total hip arthroplasty based on body mass index of implant us...
High level of noise limits the reliability of the lubricated journal bearing. In the current paper, the possibility of bearing design with a heterogeneous rough/smooth surface is explored using the computational fluid dynamics (CFD) approach to improve tribological and acoustic performance. A parametric analysis is conducted to determine the optima...
Hip joint prostheses are used to replace hip joint function in the human body. The latest dual-mobility hip joint prosthesis has an additional component of an outer liner that acts as a cover for the liner component. Research on the contact pressure generated on the latest model of a dual-mobility hip joint prosthesis under a gait cycle has never b...
Large amounts of dry solid residues are produced during the extraction of bitumen-rock asphalt, which has the potential to be a calcium of recovery for the development of value-added carbonate minerals via CO2 mineralization. The objective of this research was to use the calcination-dissolution-precipitation (CDP) method to recover calcium sources...
This study presents the use of a low-temperature hydrothermal method for extracting calcium sources from green mussel shell (P. Viridis) wastes and converting them into synthetic nanosized hydroxyapatite (HA). In this study, raw mussel shells were washed, pulverized, and sieved to start producing a fine calcium carbonate-rich powder. XRD quantitati...
Contact mechanics is the study of the behavior of solids when they come into contact at one or more points. Contact mechanics research allows for the investigation of tribology, contact stiffness, electrical contact resistance, and indentation hardness. This understanding is required for the safe and efficient design of technological systems. One o...
Bovine bone is a natural resource having valuable calcium phosphate compounds as a potential bioceramics powder feedstock. This study manipulated the calcium phosphates via hydrothermal processes after calcium phosphatecontaining bone was calcined and extracted. Here the resulting powder precursors obtained after calcining at 900 °C for 5 hours wer...
Dalam kehidupan sehari-hari, kontak akan terjadi pada dua buah benda yang saling bertemu antar satu sama lainnya. Dalam bidang ilmu Teknik Mesin, fenomena kontak ini ditemukan mulai dari komponen kendaraan bermotor, mesin perkakas, hingga implan medis. Untuk meminimalisir kegagalan yang terjadi pada implan medis, salah satu upaya yang dilakukan ada...
Anterior cruciate ligament (ACL) reconstruction frequently employs the bioabsorbable interference screw, which is 3D printed with biocomposite filaments. The purpose of this research was to construct interference screws using 3D printing filaments (HA, PLA, and PCL) at different nozzle temperatures. In this experiment, nozzle temperatures of 190, 1...
Bearing on artificial hip joint experiences friction, wear, and surface damage that impact on overall performance and leading to failure at a particular time due to continuous contact that endangers the user. Assessing bearing hip joint using in vivo, experimental testing, and mathematical formula approach is challenging because there are some obst...
Brakes are used to slow down or stop a moving object. The temperature of the disc brake will rise as a result of the conversion of kinetic energy from vehicle speed into thermal energy during the braking operation. To prevent harm to the disc brake or other components, the heat generated by this disc brake must then be released into the environment...
The development of total hip arthroplasty involves a lot of user’s external factors from medical implant, but it does not take into account internal factor that is body mass index. This paper presents a study on contact pressure in total hip arthroplasty under different loading conditions according to user's body mass index. 2D finite element analy...
Total Knee Arthroplasty (TKA) proposed as an alternative treatment for damaged knee joints of humans is reviewed. The commercial application of TKA can help patients to improve their daily normal activities. Here the high-flex type total knee arthroplasty (High-Flex TKA) is typically designed for the patient’s convenience on which the greater range...
The choice of ceramic-on-ceramic coupling in total hip prosthesis has advantages over couplings with other combinations of materials that use polyethylene and metal materials in terms of high hardness, scratch resistance, low wear rate, and increased lubrication performance. To reduce the risk of primary postoperative failure, the selection of cera...
This study aims to provide benefits on the manufacturing side in considering design parameters for optimization of total hip arthroplasty based on body mass index (BMI) categories. The femoral and cup geometries in Total Hip Arthoplasty (THA) are modeled in a simple ball-on-plane form to analyze the pressure and thickness of the lubricant film in t...
Green mussel shells are one of the calcium carbonate-rich biogenic sources. They contain 95.7 to 98.2 wt. % calcium. The high calcium content of green mussel shells was extracted and converted into calcium oxide material in the study by calcination at 900°C for 5 h. Later, at stirring times of 30, 60, 90, and 120 minutes, a solution medium containi...
In this study, PCC (precipitate calcium carbonate) was synthesized from green mussel shell waste via calcination and subsequent carbonation methods. Organic substances were removed from green mussel shell powder using a 5-hour calcination at 900 °C. Furthermore, the carbonation method was used in the Ca (NO 3 ) 2 solution at constant stirring speed...
Ultra High Molecular Weight Polyethylene (UHMWPE) has been consumed in human hip implants for the last decades. Improving the reliability of hip joint implants can reach by the understanding of wear behavior and morphology of the polyethylene. The purpose of this investigation was to determine the effect of the manufacturing process UHMWPE on the w...
A bearing is an element that maintains the relative motion between two components in industrial machines, while a journal bearing is often used to maintain the shaft constantly rotating on its axis. Generally, an increase in journal bearings’ performance is essential for industrial development. An increase in engine speed affects the distribution o...
The use of hydroxyapatite derived from green mussel (Perna Viridis) shell wastes for implant coating was investigated in this study. The study looked into using a flame-spraying technique to deposit this low-cost hydroxyapatite on AISI 316 L alloy. A standardized pull-off test on a coating thickness of 56–70 µm and a porous layer yielded a coating...
The use of material for implant bearing has a vital role in minimizing failures that endanger implant recipients. Evaluation of contact pressure of bearing material can be the basis for material selection and have correlations with wear that contribute to the need of revision operations. The current paper aims to investigate three different metalli...