Jamari Jamari

Jamari Jamari
Universitas Diponegoro | UNDIP · Department of Mechanical Engineering

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258
Publications
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1,083
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Publications

Publications (258)
Article
Full-text available
Due to various concerns about the use of metal-on-metal that is detrimental to users, the use of metal as acetabular cup material was later changed to ultra high molecular weight polyethylene (UHMWPE). However, the wear on UHMWPE releases polyethylene wear particles, which can trigger a negative body response and contribute to osteolysis. For reduc...
Conference Paper
Full-text available
The paper available of total hip arthroplasty is still concerned with the external factors of implant user, but the internal factor that is the user’s body weight has not deeply understood. Our research presents deformation analysis of total hip arthroplasty with different loading conditions based on the patient’s body mass index category. 2D model...
Article
Full-text available
Traveling with children with autism can be very challenging for parents due to their reactions to sensory stimuli resulting in behavioral problems, which lead to self-injury and danger for themselves and others. Deep pressure was reported to have a calming effect on people with autism. This study was designed to investigate the physiological effect...
Article
Total hip arthroplasty is a short-term solution for replacing a damaged hip joint with synthetic biomaterials. Total hip arthroplasty comes in two flavors: single and dual mobility. Mechanical and biological factors may degrade the quality of biomaterials over time. This may lead to implant failure and second surgical treatment. Wear is the crucial...
Conference Paper
Full-text available
This investigation aims to wear analyze of acetabular cup on metal-on-metal total hip arthroplasty with and without dimple addition. Our contribution that present in this paper is to explore the effect of surface texturing application to reduce wear that important for implant's survival. Finite element method is using with 3D human's hip joint load...
Article
The ceramic tile wall is a decorative element used inside restaurants, museums, hotels, aristocratic residences, and places of worship. It plays a critical role in the development of a structure with strong personality and unique qualities by providing relief patterns specific to history or era. The demand for distinctive ornamental wall ceramics t...
Conference Paper
Full-text available
Ultra-High Molecular Weight Polyethylene (UHMWPE) is one of the most widely used biomaterials for applications in the field of medical devices, especially implants. The use of these materials together with metal is widely used for the combination of materials in total hip arthroplasty as hard-on-soft. Although the use of this combination of materia...
Conference Paper
Full-text available
This study aims to determine the dimensional accuracy and porosity of polylactic acid scaffold using 3D printing and the value of the effective elastic modulus. The main contribution of this research is to obtain the most suitable scaffold porosity for use as cancellous bone implants. It was obtained by comparing the dimensions and porosity of the...
Conference Paper
Full-text available
The subchondral bone layer has an important role in supporting the articular cartilage under mechanical loads. Therefore, subchondral bone can affect cartilage damage, in this case osteoarthritis. Many studies have addressed osteoarthritis, but few studies have focused on the influence of subchondral bone morphology on the development of osteoarthr...
Article
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Musculoskeletal disorders are often found in various types of work, including surgeons. Standing working position is immobile and rigid when performing surgical operations. The equipment used is less ergonomic which is the main parameter. The surgeon profession belongs to the category of the high-risk profession and has the potential to experience...
Article
The Anteroposterior translational distance (AP) is one of the parameters used to assess stability in the artificial knee joint (AKJ), this translation is influenced by the posterior tibial slope (PTS) and the type of implant. The tibiofemoral contact of the medial pivot system on the AKJ provides satisfaction to the patient, especially for activiti...
Article
A greater flexion angle in total knee arthroplasty (TKA) is desirable for replacing the human knee joint damage of people living in the Middle East and Asian regions. This flexion angle is a significant clinical factor affecting the range of motion for patients. Therefore, this study aims to optimise the flexion angle in the design of the Artificia...
Article
Full-text available
Children with autism spectrum disorder (ASD) have challenging behaviors, which are associated with difficulties in parenting. Deep pressure is a therapeutic modality in occupational therapy, and it was reported to produce a calming effect. This study aimed to determine whether the short-term use of an autism hug machine portable seat (AHMPS) improv...
Article
Most of the studies with respect to the use of water-lubricated journal bearing are mainly concerned with tribological performance, whereas few studies explore the noise characteristics of such bearing. In this study, the tribological and acoustic behavior of water-lubricated journal bearing is studied using a rigorous program containing combined C...
Article
The crab shell (Portunus Pelagicus) wastes are constituted of major calcium carbonate (account for 70 wt. %) and have the potential to reuse as a starting biomaterial for precipitated calcium carbonate (PCC) products. The purpose of the present work was to synthesize PCC powder using crab shells based on the gas-solid-liquid carbonation route. In t...
Article
Full-text available
Abstrak Fraktur pada sambungan tulang pinggul merupakan masalah kesehatan yang serius. Sambungan tulang pinggul menghubungkan tulang femur dengan tulang pinggul. Ketika sambungan tulang pinggul retak atau patah, maka dapat menyebabkan cedera serius. Pengobatan fraktur tulang pinggul ada berbagai macam, namun metode penggantian sambungan tulang ping...
Article
Full-text available
The selection of biomaterials for bearing in total hip arthroplasty is very important to avoid various risks of primary postoperative failure for patients. The current investigation attempts to analyze the Tresca stress of metal-on-metal bearings with three different materials, namely, cobalt chromium molybdenum (CoCrMo), stainless steel 316L (SS 3...
Article
Full-text available
Introduction: Total hip prosthesis has become one of the important aspects of hip joint replacement surgery. The study about this implant to extent its lifetime is still limited on external factors of the patient that undergo replacement surgery. Besides, evaluating internal aspects also needs to be studied, there is users body weight. Methods: Rec...
Article
Full-text available
Introduction: Natural cancellous bone consists of inhomogeneous structures in which the porosity or pore size changes spatially. It becomes more challenging to exploit the potential of the designed scaffold to describe the complexity of bone architecture. In order to mimic cancellous bone architecture, a functionally graded scaffold (FGS) and unifo...
Article
Full-text available
This study investigated the friction and wear pattern of silica-reinforced Styrene-Butadiene Rubber (SBR) in sliding friction with a steel blade indenter. The experiments were conducted using a pin-on-disc tribometer at various applied loads and examined under dry and wet contact conditions. Analysis was focused on investigating the coefficient of...
Article
Full-text available
As with all artificial joints, wear debris is of particular concern due to its effect on both implant life and the in vivo biological reactions that can occur. The purpose of the research is to study debris characterization of PCU. Wear particle is produced from testing the PCU material using a pin on disc wear tester within 50000 cycles. This stud...
Article
Monocalcium phosphate monohydrate (MCPM) powder with nano-size particles was synthesized by a low-cost powder precursor of green mussel shells in a laboratory magnetic stirrer. In the present study, powder processing procedures included stages of preparing the raw mussel shells into the high-quality precipitated calcium carbonate (PCC) through wash...
Article
Full-text available
The automotive industry's impact on development and improvement, reli- ability and lifetime, of components is significant. Automotive market en- courages small and medium enterprises (SMEs) to enter this market, which is for SMEs a challenge to meet specified product quality. In this study, running-in wear analysis of transmission gears is conducte...
Article
Full-text available
In the present study, a computational investigation into acoustic and tribological performances in journal bearings is presented. A heterogeneous pattern, in which a rough surface is engineered in certain regions and is absent in others, is employed to the bearing surface. The roughness is assumed to follow the sand-grain roughness model, while the...
Article
The milling process on a computer numerical control (CNC) machine is a crucial operation in the development of the modern manufacturing industry. Milling is the operation of peeling workpieces on machine tools that are often used in the manufacturing industry. The quality of the machining result is generally based on the surface roughness (Ra). The...
Article
Green mussel shells contain a high content of calcium that can be potentially used for starting biomaterials. A powder processing and subsequent calcination-dissolution-precipitation (CDP) technique for recycling the shells into the value-added of precipitated calcium carbonates (PCC) is presented in this paper. In the experimental study, the recei...
Article
Full-text available
Wear and wear-induced debris is a significant factor in causing failure in implants. Reducing contact pressure by using a textured surface between the femoral head and acetabular cup is crucial to improving the implant’s life. This study presented the effect of surface texturing as dimples on the wear evolution of total hip arthroplasty. It was imp...
Article
Full-text available
The wear of hip prosthesis due to applied load and sliding distance during the patient's daily activity cannot be avoided. Wear causes osteolysis or metallosis due to the wear debris produced by the wear process. Several methods were used to reduce wear in metal-on-metal hip prostheses. One of the efforts performed to reduce wear was the differenti...
Article
Full-text available
Background: AISI 316L stainless steel material is one of the widely used hip joint implant material. Even with excellent properties for the hip joint implant, this material is likely to fail after 12-15 years of implantation because of excessive wear and stresses. The computational analysis using the finite element method can be used to analyze t...
Article
Full-text available
Herein, a machining strategy to fabricate custom orthotic insoles with high surface finish and wide fit tolerance is presented. CNC milling was used to machine ethylene-vinyl acetate (EVA) foam for insoles with various surface hardness, and the Taguchi-response surface method (TM-RSM) was adopted to optimize the parameters of the CNC milling proces...
Article
Currently, the artificial hip joint is the best option for total hip arthroplasty, and the demand for this procedure is increasing annually. However, a major deficiency of artificial hip joints is the performance limitation in a wide range of movements, such as those in Muslim prayer (salat), a major religious practice that consists of seven positi...
Article
Full-text available
Develop of fishery port area in the Semarang city, therefore need improve for a fishing vessel design that inaugurated the representative of the port area Tambak Lorok. The vessel was also not equipped with hydrostatic calculations, stability and so on, then most fishermen in Indonesia use wood as a material for the creation of fishing vessels. The...
Article
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Crosslinked ultra-high molecular weight polyethylene (UHMWPE) is a preferred material used as a bearing material in the artificial hip joint. The purpose of this study was to analyze the effect of dose cross-linking acetabular liner manufactured by CNC milling on wear depth. The wear test is carried out with a tribometer machine by loading the acet...
Article
Full-text available
Club foot is one of the foot deformities due to genetic factors, diseases, the condition of pregnant women is too small, or the result of a marriage that has a kinship. For every 1000 normal childbirths, there is usually one birth of a child with a leg like this. Children with this leg shape often have difficulty doing daily activities. In this pap...
Article
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In this paper, the design of orthotic boots in the club foot patient is investigated concerning the optimum condition of cutting parameters using computer-aided manufacturing. 3D CAD model insole is obtained from the scanning process until the design phase using reverse innovative design method. 3D CAD Model insole is designed using curve Base Mode...
Article
Full-text available
On the process of constructing ships with the block system has a tendency to dealing time production process for assembly. The waiting time makes the construction of the bottom plate to receive the burden during the waiting time so that the deformation often occurs due to excess stress received. The purpose of this study to know the stress value of...
Article
Full-text available
The slip boundary has an important influence on hydrodynamic journal bearing. However, less attention has been paid to the positive effect of slip on thermal behaviour. In this study, a computational fluid dynamics (CFD) analysis investigating the thermo-hydrodynamic (THD) characteristics of heterogeneous slip/no-slip bearings running under steady,...
Article
Full-text available
The use of fiber-reinforced polymer (FRP) for prosthetic devices is now very common. Various polymer resins have been reinforced the fiber yielding composite with better strength-to-weight characteristics compared to a single material and also providing better biocompatibility. The purpose of the present study was to examine a single glass, carbon...
Article
Full-text available
The design and manufacturing strategy using reverse engineering (RE) for Miranda Kerr Tea for One Teapot are presented in this paper. A computer-aided reverse engineering system (CARE System) was applied to minimize file errors generated by scanning Miranda Kerr Tea for One Teapot sample products made from Bone China clay. Digital data from the sca...
Article
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The purpose of this study was to study the growth of struvite crystals from the effect of adding tartaric acid additives to an aqueous solution containing Mg ²⁺ , NH4 ⁺ , and PO4 ³⁻ with a molar ratio of 1:1:1. The results of the study, it was found that the more the concentration of tartaric acid additive was added, it got smaller the rate constan...
Article
Full-text available
In this paper, based on an analytical approach, the effect of pockets and boundary slip on the hydrodynamic performance of parallel sliding surfaces considering cavitation is investigated. A modified Reynolds theory is developed for solving two kinds of bearings: a single and a double pocket bearing. The performance is compared with respect to the...
Conference Paper
In the pen cover opening mechanism, the contact area on the body surface and the surface of the cover touch each other. When a surface is stressed and moved relative, the surface undergoes changes in conditions that cause heat. This is one of the causes of wear and damage to components. The author develops the design by analyzing contact using the...
Conference Paper
The sand sieve machine that has been designed and has a drive system consisting of a crank, shaft, and key. These three components interact with each other. This paper will explain the contact that occurred. The interaction will be simulated with the help of Abaqus software. Stages of simulation performed are preprocessing starting from making 3D i...
Article
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Keausan pada tulang panggul buatan atau hip prosthesis merupakan fenomena yang tidak bisa dihindari. Informasi keausan pada hip prosthesis perlu diketahui dalam mempertimbangkan perancangan hip prosthesis . Pada tahun 2019, penulis telah mengusulkan persamaan untuk menghitung keausan pada hip prosthesis . Hasil perhitungan persamaan keausan tersebu...