Dual element MIMO planar inverted-F antenna for 5G millimeter wave application

This work presents a 28 GHz Dual Element Multiple Input Multiple Output (MIMO) Planar Inverted-F Antenna for millimeter wave 5G mobile terminal. The antenna design employs PIFA design concept as it is a common antenna type use for mobile phone as it provides wide bandwidth and good performance. The antenna design begins with a characterization of the single element PIFA design and then extended to Dual Element MIMO PIFA design. The single element PIFA design is enhanced to MIMO design by extending the ground plane and locate the second PIFA at the other end. Isolation between the antenna elements of the MIMO PIFA is analyzed by varying the gap distance between the antenna elements. The result for Envelope Correlation Coefficient, Diversity Gain and Multiplexing Efficiency is also presented. The simulation computed using Computer Simulation Technology (CST) Microwave Studio software

Pemanfaatan Limbah Alkali Industri Rumput Laut Dan Limbah Pickling Industri Pelapisan Logam Sebagai Pupuk Anorganik

Limbah cair dari industri rumput laut (Eucheuma cottoni) yang dalam proses pengolahannya menggunakan Kalium Hidroksida (KOH) mempunyai kandungan Kalium. Sedangkan dari proses pickling di industri lapis listrik dihasilkan limbah cair sekitar 2 m3 untuk setiap 1000 m2 benda yang dilapis. Limbah cair ini mengandung FeCl2/FeCl3, jika tidak dikelola dengan baik akan menyebabkan pencemaran lingkungan. Dengan dimanfaatkannya secara bersama limbah pickling dan limbah cair dari rumput laut, maka lingkungan akan tetap terjaga.Tujuan penelitian ini adalah memanfaatkan limbah cair dari industri rumputlaut dan limbah cair dari proses pickling di industri elektroplating untuk pembuatan pupuk Anorganik sebagai salah satu upaya pengelolaan lingkungan.Keluaran dari kegiatan ini adalah penanganan limbah secara integrasi dari limbah cair industri rumput laut dan proses pickling yang dapat dimanfaatkan sebagai pupuk. Limbah cair dari industri rumput laut dapat dimanfaatkan secara bersama dengan limbah cair dari proses pickling di industri electroplating untuk dijadikan pupuk buatan yang memenuhi persyaratan Pupuk KCl yang mengacu pada SNI 02 – 2805:2005. Kadar kalium sebagai K2O dari hasil pengolahan limbah cair industri rumput laut tersebut berkisar antara 0,08 - 0,12 % (800 – 1200 ppm) nilai tersebut lebih tinggi dari pada nilai standard sesuai SNI 02 – 2805: 2005 sebesar 600 ppm

Characterization of a Plain Broadband Textile PIFA

Bandwidth characteristic of a wearable antenna is one of the major factors in determining its usability on the human body. In this work, a planar inverted-F antenna (PIFA) structure is proposed to achieve a large bandwidth to avoid serious antenna reflection coefficient detuning when placed in proximity of the body. The proposed structure is designed based on a simple structure, in order to provide practicality in application and maintain fabrication simplicity. Two different types of conductive textiles, namely Pure Copper Polyester Taffeta Fabric (PCPTF) and ShieldIt, are used in order to proof its concept, in comparison with a metallic antenna made from copper foil. The design is spaced and fabricated using a 6 mm thick fleece fabric. To cater for potential fabrication and material measurement inaccuracies, both antennas' performance are also investigated and analyzed with varying physical and material parameters. From this investigation, it is found that the proposed structure's extended bandwidth enabled the antenna to function with satisfactory on-body reflection coefficients, despite unavoidable gain and efficiency reduction

Implementing Aproiri Algorithm for Predicting Result Analysis

University or Higher Learning Institution is a platform to train students in specific domain area that will become an asset for a country. One of the critical issues in University is to avoid dropout students. Educational Data Mining (EDM) is an emergent discipline in developing methods to explore the unique types of data from the educational context. One of the techniques applied in EDM is an Association Rules (AR) which is to find a pattern of one element influencing other element. In this paper, AR technique has been utilized to predict students’ results based on a group of the previous students results. Clustering method has been used to classify the specific subject category. Finally, a system known as Result Prediction System (REPS) has been developed to perform automatically the AR analysis on the academic data using PHP and MYSQL databases

Survei Cepat terhadap Tikus dan Keong Perantara Schistosomiasis di Daerah Endemis, Dataran Tinggi Bada Kabupaten Poso, Sulawesi Tengah

Schistosomiasis merupakan penyakit terabaikan (neglected disease) yang ditemukan endemis di Sulawesi Tengah, yaitu di Dataran Tinggi Lindu, Napu dan Bada. Dataran tinggi Bada merupakan daerah endemis schistosomiasis yang baru ditemukan pada tahun 2008. Survei cepat ini bertujuan untuk mendapatkan informasi mengenai infection rate schistosomiasis pada keong Oncomelania hupensis lindoensis dan tikus, serta identifikasi tikus sebagai mamalia hospes definitif selain manusia di Bada. Survei dilakukan pada bulan Januari 2015. Pemeriksaan serkaria keong dilakukan dengan metode crushing. Tikus yangdiperoleh diidentifikasi kemudian dibedah untuk memperoleh cacing chistosoma japonicum dan penentuan infection rate pada tikus. Ditemukan tiga keong positif serkaria S.japonicum (infection rate 15%) dari 20 keong yang diperiksa. Diperoleh tiga ekor tikus positif cacing S.japonicum dari 20 perangkap yang dipasang (infection rate 100%). Jenis tikus yang diperoleh adalah Rattus norvegicus, R.argentiventer dan Paruromys dominator. Hasil survei menunjukkan bahwa tingkat infeksi schistosomiasis pada binatang cukup tinggi, sehingga menyebabkan siklus silvatik terus berlangsung

ISOLATION AND CHARACTERIZATION OF MICROCRYSTALLINE CELLULOSE FROM OIL PALM FRONDS USING CHEMO-MECHANICAL PROCESS

This study investigates the characteristic of the microcrystalline cellulose (MCC) isolated from oil palm (Elaies guineensis) fronds using acid hydrolysis method. The morphology and size of the MCC were characterized using both Sherrer equations for X-ray diffraction (XRD) result and transmission electron microscopy (TEM). The thermal stability of MCC was determined from thermogravimetry analysis (TGA) profiles whilst, Fourier transform infrared spectroscopy (FTIR) was used to analyse the chemical modifications that occurred under these conditions. The XRD results showed that the MCC isolated from oil palm fronds (OPF-MCC) fibres had an average diameter and crystallinity index of 12.15 nm and 60.1 % respectively. Both the FTIR and the XRD indicated that lignin and hemicellulose contents decreased while the cellulose-I polymorph remained constant. Thermogravimetric analysis (TGA) revealed that OPF-MCC had higher thermal stability compared to the OPF fibres. The study revealed the potential applications of the MCC isolated from the oil palm biomass as green reinforcement or/and fillers in the production of biodegradable biocomposite

Feasibility Study of Natural Fiber Composite Material for Engineering Application

This paper presents a feasibility study of natural fiber-tin lead alloy composite material for engineering application. The specimen aluminum mold plate was made using a laser cutting machine. Rice husk was selected for introduction to the tin-lead alloy composite. Sand casting techniques and a hot press molding machine were used to produce the specimen. Three types of testing were used in these studies: tensile test, flexural test and hardness test. A new technique for preparing a natural fiber and metal matrix composite material using a manual mixer has been developed to stir the mixture uniformly during the solidification phase. The SiC particulate and rice husk as a natural fiber were introduced to the tin-lead alloy for engineering applications to maintain the hardness of the material. It was found that the mechanical properties of the fabricated composites increased through reinforcement with SiC and rice husk in the material matrix of Sn, particularly for flexural and hardness properties. However, the result shows the tensile strength not significantly improved as the tensile strength for the composite is lower than that for tin-lead alloy (60-40). The experiment also obtained better performance for the tensile modulus and flexural modulus. There is potential to use rice husk in Sn composite material for engineering applications