Purnomo Purnomo

Purnomo Purnomo
University of Muhammadiyah of Semarang · Mechanical Engineering

About

36
Publications
5,559
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
159
Citations

Publications

Publications (36)
Conference Paper
Polylactidacid (PLA) is a type of bio-based and bio-degradable plastic. This substance is commonly used in the medical field since it is biocompatible and does not hurt bodily tissues. In this study, PLA plastic will be combined with chitosan (CS) via injection molding. The addition of CS to compensate for the absence of PLA with hydrophobic charac...
Article
Full-text available
Cerebral palsy (CP) is a brain disorder experienced by a person, which results in experiencing many disturbances in motor activities. Impaired motor coordination in people with CP is immediately apparent when observed. The coordination ability of players is needed in activities during playing football. Adequate instruments are necessary to measure...
Article
Full-text available
Surface modification with plasma has been widely applied to polymeric materials. This treatment is intended to improve the surface properties of the polymer including its wettability and adhesiveness. The aim of this paper is to provide a review of the literature on the surface treatment of polymers with plasma, which focuses on the effects of adhe...
Article
Full-text available
Acrylonitrile Butane Styrene (ABS) is a type of polymer that can be metallized with metal through the electroless plating process so as to produce a strong and economical layer bond compared to metal. In this study, ABS plastic will be coated with nickel and the contact angle of ABS after the coating process will be examined. The first step is the...
Article
Full-text available
The high oil content in fried products, including mushroom chips, can cause low quality chips. Chips contain a lot of oil which causes easy oxidation which can cause a rancid odor. This service aims to improve the quality of chips through the application of an oil draining spinner. The application of this machine is intended to reduce the maximum o...
Article
Full-text available
This study is focused on investigating errors made by students and the various causal factors in working on trigonometry problems by applying sine and cosine rules. Samples were taken randomly from high school students. Data were collected in two ways, namely a written test that was referred to Polya's strategy and interviews with students who made...
Article
Full-text available
The aim of this work is to investigate the fracture toughness and deformation of silk fiber (SF)-reinforced zeolite (Z)/high density polyathylene (HDPE) composites. The chopped SFs are arranged in the thickness middle of the dry mixture of Z/HDPE powder that has been prepared in a mold. Composites were produced by the compression molding to produce...
Article
Full-text available
Mechanical failure of zeolite-high density polyethylene (HDPE) material applied to skull bone implants is a material fracture that cannot be controlled. An important step to minimize failure due to fracture is to understand the fracture characteristics indicated by the propagation path pattern. This study aimed to investigate the fracture propagati...
Article
Full-text available
This research aims to determine the effect of adding filler material in the form of waste material on Nitrile Butadiene Rubber (NBR) in making roller rubber to improve quality in terms of hardness and tensile strength. Each rubber roller compound is made from a mixture of NBR with rice husk, recycled rubber and wood charcoal. The process of making...
Article
Full-text available
Ketersediaan buah sukun berlimpah di desa Meteseh di RW. X Kecamatan Tembalang Kota Semarang. Kelompok petani BAROKAH mengembangkan usaha keripik sukun. Kelompok petani ini memanfaatkan buah sukun yang tersedia melimpah di wilayah Meteseh untuk dibuat keripik sukun. BAROKAH mempunyai permasalahan dalam hal terbatasnya peralatan penunjang pembuatan...
Article
Full-text available
This review is focused on potential or already implemented applications of hydroxyapatite (HA) - zeolite composites as a human bones implant. The methodology is to synthesize and broaden the collection of literature published in the last ten years. The reviews are divided into two main sections, namely the synthesis and the characterization of HA-z...
Article
Full-text available
One type of aluminum widely use is AA 6061 because it has a good mechanical properties and corrosion resistance when compared to the other types of aluminum. Those properties of this alloy can be improved even better by using the anodizing process. In this study, the results of anodizing AA 6061 will be investigated using molarity of sulfuric acid...
Article
Full-text available
The aim of this study is to investigate the behavior of banana fiber (BF)-low-density polyethylene (LDPE) composite fracture toughness. The LDPE pellets are transformed into powder form which is then functioned as a matrix reinforced with banana fiber (BF). The composites were formed by injection molding techniques which are followed by atmospher...
Article
Full-text available
One type of non ferrous material that has quite a number of applications is aluminum. In addition, this metal is quite easy to obtain and can be made in various ways and has good corrosion resistance. One method commonly used in producing aluminum is by casting. This method is quite often used because it can produce finished products in large quant...
Article
Full-text available
Usaha pengolahan ikan asin menjadi sangat penting bagi penduduk yang tinggal di daerah pinggir laut dan daerahnya menjadi kurban rob. Tambak yang sudah menyatu dengan laut akibat rob, menyebabkan pendapatan masyarakat menurun drastis. Hasil-hasil melaut dan tambak tidak dijual dalam keadaan mentah, namun ikan dan udang bisa diolah menjadi produk la...
Article
Full-text available
Fracture toughness of polymer-based composites in plane stress condition has been successfully evaluated using latest method namely essential work of fracture (EWF). This method has been extensively performed in order to assess the performance of two parameters in fracture, i.e. essential work of fracture (we) and non-essential work (βwp) ones. The...
Article
This study focuses on an investigation of the fracture behavior of zeolite-HDPE composites after annealing treatment under atmospheric pressure. Annealing processes were carried out at various holding time (12, 24, 36, and 48 hours). The fracture toughness of composites was investigated based on the essential work of fracture (EWF) concept, and the...
Conference Paper
This review focuses on the latest reports of the use of zeolites, natural as well as synthetic, as biomedical materials. Discussion on biocompatibility, non-toxicity, zeolite for drug delivery materials, zeolite for bone implants and implant coatings, and the mechanical properties of polymer-zeolite composites are included. The section on the inter...
Article
In this study we examined the effect of topography and corrosion resistance of aluminum alloy 6061 which has been anodized on a mixture of phosphoric acid and oxalic acid by using titanium cathode. Surface topography was tested with the N8 NEOS Bruker, corrosion testing performed by Tafel method using a potentiostat Autolab (PGSTAT302N), while test...
Article
The corrosion resistance of the oxide layer of aluminum alloy 6063-T5 obtained from the anodizing evaluated using electrochemical impedance spectroscopy (EIS) using different corrosion media, i.e. pure aqueous solution, 1 M sodium chloride and 1 M chloride acid in order to determine the extent to which the ability of a layer of anodic formed to res...
Article
Full-text available
This study explores the zeolite-high-density polyethylene (HDPE) composites annealed at 90C which was investigated to obtain the crack growth and deformation behavior under tensile loading until the specimen was completely broken. Crack growth and deformation were obtained from the double-edge-notched tensile (DENT) test. At each stage of fracture...
Article
Full-text available
Silk fibroin is an outstanding material because of their biocompatible and excellent mechanical properties. This review article is focused on silk fibroin and silk fibroin-based composites that are used as biomaterials and their potential for composite reinforcing materials for artificial bone engineering. This material is chosen because it is bioc...
Article
Full-text available
Aluminum is a material with a variety of uses in various fields because this material is easy to obtain, can be made in various ways and has good corrosion resistance. Now this material begins to be studied and applied to the realm of biomaterials, with the use of the membrane of the aluminum oxide layer on the body of living things began to be app...
Conference Paper
Full-text available
Fracture toughness of polymer-based composites in plane stress condition has been successfully evaluated using latest method namely essential work of fracture (EWF).
Article
Full-text available
This work aims to investigate the deformation under quasi static loading in zeolite-filled high density polyethylene. The investigation was carried out on dumbbell specimens by uniaxial tensile according to ISO 527 and on the double-edge-notched tension (DENT) specimens based on energy partitioning work of fracture. Energy partitioning approach, ba...
Article
The fracture behavior of annealed composites of zeolite-filled high density polyethylene has been investigated using the essential work of fracture concept. The crack opening displacement (COD) was estimated starting from the essential work of fracture value. The morphology of the fracture surface was examined using the scanning electron microscopy...
Conference Paper
Full-text available
This work is focused on an investigation of tensile behavior of natural zeolite-high density polyethylene (HDPE) annealed composites. Annealing process of injection molded composite was performed at 90 o C for 12 h. Uniaxial tensile test was conducted at constant cross head speed of 4 mm/minat room temperature (25 o C). Results showed that elongati...
Conference Paper
Brittle nature of hydroxyapatite for bone implants reduced by adding chitosan. To strengthen the particles bond of the composite, cyanoacrylate was infiltrated into the composites. Infiltration was performed at room temperature and without any external pressure treatment system. The aim of this study is to examine the microstructure of hydroxyapati...
Article
Full-text available
The impact fracture toughness of zeolite reinforced high density polyethylene (HDPE) composites which were prepared by an injection molding has been investigated using essential work of fracture (EWF) concept. The Charpy impact tests were carried out on single-edge-notched bending specimens under velocity of 3.4 m s-1. The results showed that the c...
Article
This study focused on the morphology and mechanical properties of novel implant skull reconstruction from the natural zeolite-high density polyethylene (HDPE). The composites were formed through injection molding techniques. Scanning electron microscopy (SEM) was used to investigate the morphology of composites. The composite morphology showed the...
Article
Novel biomaterials from natural zeolite-filled high-density polyethylene (HDPE) have been successfully formed through injection molding techniques at a barrel temperature of 160°C and with a barrel holding time of 2 minutes. Fracture behavior of a quasi-static state was investigated using the method of essential work of fracture (EWF) in a double e...

Network

Cited By