Studi Pengaruh Ukuran Pixel Imaging Plate Terhadap Kualitas Citra Radiograf

This study aims to determine the image on each imaging plate which has a different pixel sizes. This research is using a plane X-ray, Computed Radiography (CR) which is used in the diagnostic field. This study uses three imaging plate each having size of 0.097 mm, 0.115 mm and 0.168 mm with stepwedge objects on it and use the same factor, namely kV eksposi: 64.5 and mAs: 16. In each of the imaging plate in eksposi 3 times and the results of each radiograph imaging plate will be measured by using a densitometer. Stepwedge radiograph of the measurement results will be obtained the density and contrast value of each imaging plate. Contrast value for each imaging plate will be compared so they will know what the size of the imaging plate which has a higher contrast value. Research on the effects of different pixel size on the imaging plate is done in Radiology Hospital Tugu Semarang, in July 2014. From the results it can be concluded each different pixel sizes on the imaging plate will generate a different image quality

Cyclist Performance Classification System based on Submaximal Fitness Test

Performances among cyclist always measured by time traveled from start to finish line and then the winner in cycling event also decided by time or who crossed the finish line first. On the other hand, cyclist performance can be measured through cardiorespiratory and physical fitness, and this performance can be enhanced by proper training to increase fitness and skill without burden. A wireless sensor network (WSN) system developed by combined various sensing element to capture physiological and bicycle’s kinetics feedback. Physiological data such as heart rate variability (HRV) and kinetic data such as paddling power and cadence used as input in Astrand-Ryhming and PWC150 submaximal test to classify the performance group among cyclist. Developed HRV system using Photoplethysmography (PPG) provides the significant output with R2 value was 0.967. A group of 15 cyclists from three different backgrounds was used as a subject in this study. Maximal oxygen intake (VO2max) produced by AstrandRyhming test correlated with estimated paddling power produced by PWC150 test with P<0.01 and the R2 value was 0.8656. Discriminant analysis was 88.3% successfully classified cyclist into 3 group and group of trained and untrained cyclist clearly separated

Perbandingan algoritma k-nearst neighbor dan naïve bayes pada aplikasi shopee

E-commerce merupakan aplikasi yang digunakan untuk melakukan segala aktivitas jual-beli secara online beberapa masalah transaksi jual-beli online terutama pada shopee terkadang banyak kendala. Ulasan dari pengguna sering digunakan sebagai alat yang efektif dan efisien untuk mencari informasi tentang suatu produk atau layanan. Pengguna internet sering melihat ulasan suatu produk sebelum menggunakannya karena ulasan dari pengguna lain dapat memberikan informasi terkini. Pada penelitian ini penulis menggunakan dua (2) jenis metode algoritma yakni K-Nearst Neighbor dan Naive Bayes Classifier. Penulis menggunakan dua (2) metode untuk mengetahui tingkat akurasi terbaik yang di hasilkan. Penulis menggunakan algoritma K-Nearst Neighbor karena pada penelitian sebelumnya terdapat hasil yang bagus. Juga menggunakan algoritma Naïve Bayes Classifier karena metode ini merupakan metode yang popular dan lebih sering digunakan.algoritma K-Nearst Neighbor pada aplikasi shopee menunjukkan bahwa tingkat akurasi 55.00% dimana jumlah data untuk sentimen negatif sebanyak 100 ulasan, dan sentimen positif sebanyak 100 ulasan dari data testing yang digunakan sebanyak 200 data atau 20% dalam metode K-Nearst Neighbor. Lalu tingkat akurasi mencapai 80,00% dimana jumlah data untuk sentimen negatif sebanyak 99 ulasan dan sentimen positif sebanyak 101 ulasan dari data testing yang digunakan sebanyak 200 atau 20% dengan metode Naïve Bayes Classifier. Dalam penelitian ini, dapat diketahui bahwa metode Naïve Bayes Classifier adalah metode yang tingkat akurasinya lebih tinggi dibandingkan K-Nearst Neighbor dengan tingkat akurasi sebesar 80,00%

In situ synthesis of hydroxyapatite-grafted titanium nanotube composite

The present study is an investigation to demonstrate the effectiveness of insitu approach in the synthesis of hydroxyapatite-grafted titanium nanotube composite (HA-TNT). This method involves combining the process of HA sol–gel and rapid breakdown anodisation of titanium in a novel solution consisting of NaCl and N3PO4. This new synthesis approach produced a uniform dispersion of Anatase and Rutile phases of TiO2 nanotubes with minimal agglomeration in the matrix of crystalline HA. The characterisation of homogenised HA-TNT composite was investigated via field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), transmission electron microscope (TEM) and X-ray diffraction (XRD). FESEM and TEM images indicated the nanostructure of composite with TiO2 nanotube diameter of approximately 10 nm. XRD and EDS analyses confirmed the formation of HA crystalline with the Ca/P ratio of 1.58 and formation of Anatase and Rutile phase of TiO2 nanotubes

Effects of kenaf bast fibres on hydration behaviour of cement

The compatibility between cement and kenaf bast fibre and its improvement with various types of accelerators were investigated by observation and analysis on hydration behaviour in terms of hydration characteristics, namely, maximum hydration temperature and required time to reach maximum temperature. Five extraction methods (crude, water retting, decortication, NaOH retting and benzoate retting), four accelerators (CaCl2, AlCl3, Na2SO4, CaO), three concentrations (2, 4 and 6%) and three particle sizes (0.5, 0.8 and 4.0 mm) were used. The hydration behaviour of mixtures demonstrated that NaOH and benzoate were unsuitable with cement. Meanwhile, CaCl2 and CaO were found to be effective accelerators for restraining inhibitory influences. In addition, 2% accelerator was available and acceptable for quick-curing cement. Particle sizes of 0.5 and 0.8 mm required addition of accelerators to reach maximum cement setting

Cloud-Based In-Vehicle Air Quality Monitoring System with GSM Module

The purpose of this study is to develop a monitoring system that not limited to real-time vehicle tracking, but also with the ability to monitor in-vehicle air quality. In vehicle air quality is referred to indoor air quality (IAQ) inside the vehicle cabin which is lacked of awareness among driver nowadays. Previous research indicates that human spend up to 90% of their daily time inside the closed circulated air environment including, the vehicle. Prolonged use of air recirculation inside the vehicle cabin can lead to a gradual accumulation of carbon dioxide (CO2) which may occur the symptoms such as fatigue, headaches, and dizziness even deleterious effects on cognitive function towards the occupants. Vehicle cabin is an enclosed environment to prevent the outdoor air directly flow inside the vehicle cabin. However, when the vehicle speed increases the air pressure will be applied onto the joint of the car body and created some leakages then the outdoor air can flow into the cabin then may change the IAQ. A Global System for Mobile (GSM) communications module is utilised as a proxy to push the aggregated information such as real-time vehicle location, IAQ status and timestamps into the cloud database with an iteration of the 30s. The average time delayed for data to reach the cloud database is approximate 3.6s from the time it transmitted. Through the Android mobile application, the user can observe the in-vehicle air quality with the current location in two optional modes: real-time or historical data. The developed device and system were compared with off the shelf device (AeroQual). The Bland-Altman plot method was applied to validate the result of in-vehicle air quality system. The coefficient of determination (R2) value between these two devices is approximately 0.9. The in-vehicle air quality with vehicle tracking system has been successfully developed and provided a reliable result

Brief review on dissimilar welding using cold metal transfer

Hybrid joint configuration nowadays has been an essential process for fabrication in both industrial and construction industry. However, the challenges in welding two varied materials need to consider both metal characteristics since the joint of the different metals from various properties cause the formation of intermetallic compounds (IMCs) layers can cause the failure. Various parameters (i.e; welding current, welding speed) and factors (i.e; materials' thickness and properties) need to be considered when joining two different metals using welding. Common methods use for joining two different metals are friction stir welding, laser welding, resistant spot welding and gas metal arc welding (GMAW). Cold metal transfer method (CMT) is new technique that recently applied for joining dissimilar metal weld especially for thin metals of 0.3∼2.0 mm. Major advantage of CMT is using low power and green technology process. This review provides explanation of common field which applying dissimilar metal welding and discuss the previous related researches with example of different materials being used. This including factors that need to be concerned to produce good welding joint and the current research using cold metal transfer for hybrid joint configuration

Mechanical and physical properties of particleboard made from 4-year Old RRIM 2000 series clone rubberwood.

Rubber trees are normally felled after 25 years. With the drastic depletion of rubberwood supply, the Malaysian Rubber Board has identified new clones of rubberwood from RRIM 2000 series that are expected to be suitable for timber and latex production. In this study, particleboards were made from 4-year-old RRIM 2000 series rubberwood clones. The clones—RRIM 2002, RRIM 2020 and RRIM 2025 were compared with the currently available clone, PB 260, that is used by most rubberwood processing plants in Malaysia. The board was fabricated using E1 grade urea formaldehyde resin to a density of 700 kg m-3 and board performance was determined according to JIS A 5908-2003. The study revealed that it was technically feasible to use 4-year-old rubberwood from the RRIM 2000 series clones, especially RRIM 2002, for making particleboard which is comparable to that made from the mature (25-year-old) PB 260 clone

Changes in strength and chemical contents of oil heat treated 15-year-old cultivated Acacia hybrid

Studies were conducted on the changes in strength and chemical contents of cultivated 15 year-old Acacia hybrid treated through oil heat treatment process. The timbers harvested and cut at the portions bottom, middle and top, were oil heat treated using palm oil for durations of 30, 60 and 90 min. at temperatures of 180, 200 and 220℃. The untreated A. hybrid was used as control. The results of the studies showed that the oil heat treatment process causes some changes in the strength and chemical composition of the timbers. Strength reduction during the bending tests in both the MOR and MOE were noted throughout the treatment process. The chemical constituents of the treated timber also underwent changes in their contents. The holocellulose and cellulose degraded with the increasing of treatment temperature and duration in the oil heat treatment, while lignin showed the increment in content through this treatment. The changes in values of both the strength and chemical contents were influenced by temperature and duration of the treatment