FDM preparation of bio-compatible UHMWPE polymer for artificial implant

Due to its properties of high wear, creep resistance, high stiffness and strength, Ultra-High Molecular Weight Polyethylene (UHMWPE) was developed to eliminate most metallic wear in artificial implant, which conventionally found in stainless steel, Cobalt Chromium (Co-Cr) and Titanium (Ti) alloys. UHMWPE has an ultra-high viscosity that renders continuous melt-state processes including one of the additive manufacturing processes, Fused Deposition Modeling (FDM) ineffective for making UHMWPE implant. Attempt to overcome this problem and adapting this material to FDM is by blending UHMWPE with other polyethylene including High Density Polyethylene (HDPE) and Polyethylene-Glycol (PEG) which provide adequate mechanical properties for biomedical application along with the improvement in extrudability. It was demonstrated that the inclusion of 60% HDPE fraction has improved the flowability of UHMWPE in MFI test and showing adequate thermal stability in TGA

Analisis Alih Fungsi Lahan Padi Menjadi Lahan Sawit di Desa Kemuning Muda Kecamatan Bunga Raya Kabupaten Siak

The change of land type is to increase the land-use type in one sector followed to other sectors by the reduction of land types. By the other word, the land-use change is the change of land function in a particular period of time, as such the changes of agricultural land that used for non-agricultural land. The aim of this study is to investigate and analyze the conditions of farming business society in Kemuning Muda Village of Bunga Raya sub-district in Siak Regency as well as to investigate and analyze the factors that affect farmers to make the conversion of the paddy land to oil palm land in Kemuning Muda Village of Bunga Raya sub-district in Siak Regency. This study is expected to be as inputs and sources of thought for other studies in deeper investigation of the land conversion issues. This study was occurring at the beginning to end of January. The quantitative descriptive study methodology was employed to find out and describe the particular social phenomenon and attempt to analyze it appropriately with the fact based on collecting data. The types of data used were primary and secondary data. The data collection techniques were using questionnaires and documentation. Descriptive quantitative methods was used for data analysis, first the authors frame the data into a table and then briefed and analyzed descriptively. The aim of this study is to investigate and analyze the conditions of farming business society in Kemuning Muda Village of Bunga Raya sub-district in Siak Regency as well as to investigate and analyze the factors that affect farmers to make the conversion of the paddy land to oil palm land in Kemuning Muda Village of Bunga Raya sub-district in Siak Regency. This study is expected to be as inputs and sources of thought for other studies in deeper investigation of the land conversion issues. This study was occurring at the beginning to end of January. The quantitative descriptive study methodology was employed to find out and describe the particular social phenomenon and attempt to analyze it appropriately with the fact based on collecting data. The types of data used were primary and secondary data. The data collection techniques were using questionnaires and documentation. Descriptive quantitative methods was used for data analysis, first the authors frame the data into a table and then briefed and analyzed descriptively. The results showed that the data presentation of this study described based on data gathered from field research which includes a variety of farmers characteristics may include demographic character, social character and the character of the economic condition of the farmers themselves. These characters differentiate the type of farmer behavior in certain circumstances. Characteristics observed in this study were age, education, the number of dependents, employment, land area, income. The factors influencing farmers to conversion of land-use were social change in the farmer groups community wherein bring the change of social and economic conditions around him both internally and externally. The results showed that the data presentation of this study described based on data gathered from field research which includes a variety of farmers characteristics may include demographic character, social character and the character of the economic condition of the farmers themselves. These characters differentiate the type of farmer behavior in certain circumstances. Characteristics observed in this study were age, education, the number of dependents, employment, land area, income. The factors influencing farmers to conversion of land-use were social change in the farmer groups community wherein bring the change of social and economic conditions around him both internally and externally. Keywords: conversion, land, social Keywords: conversion, land, socia

Analisis Efisiensi Faktor Produksi Padi Sawah dalam Rangka Ketahanan Pangan di Desa Tumpatan Kec. Beringin Kab. Deli Serdang

There is many factors internal and external factors that determine the level of rice production and rice production efficiency factor is very varied. This study aims to determine the efficiency of rice production factors. In the framework of food security in Tumpatan Village Deli Serdang regency.Case study method in the Village Tumpatan with multiple regression analysis techniques. Primary data were collected by interview by referring to kuissioner that has been prepared.Results showed partial seeds, fertilizers and pesticides have a significant and positive impact on rice production, labor is partially negative and significant effect on rice production. Variables simultaneously seed, fertilizer, labor and pesticides affect the rice production.Factors of production of seeds, fertilizers, and pesticides experiencing technical efficiency, and labor have not been efficient. Variables simultaneously seeds, fertilizer, pesticides and labor variables can explain the production of rice was 99.90% while the remaining 0.10% is explained byother variables that do not exist in the estimation model

Tracking human movement in office environment using video processing

In this paper, we proposed an approach of multi-person movement tracking in office environment without any identity conflicts. Simple image processing with frame differentiation method is applied to identify multiple human motion. An Expert System is applied to predict next camera occurrence of the tracking human. The main objective of this work is to detect and track multi-human motion using single camera in more than a room in an office

Ff-IR Spectroscopic Studies on Lignin from Some Tropical Woods and Rattan

Klason lignin of four different types of tropical hardwoods and rattan was studied using rT-IR spectroscopy. There were observable differences in the rT-IR spectra of the lignin studied. Lignin from the more durable and more resistant wood were found to contain less guaiacyl groups than that from the softer and less resistant wood. 77re strength and resistance of the wood might be related to its lignin content

Constructing a Test for Assessing Higher Order Thinking Skills of High School Students on Reproductive System

The research aims to constructthe paper test to assess the higher order thinking skills of high school students. The research was designed based on Borg and Gall research method. Firstly, test from national examination, formative and summative test, and also the test written in high school Biology textbook commonly used in Surakarta were analyzed, and it found that most of the test are to measure the lower order thinking skills. Draft of HOTS on reproductive system then been formulated, and validated by three experts and teachers on three aspects, i.e. language, content, and construction of the instrument. The test was divided into two packages, A and B, each consists of 15-multiple choice items, and 5 essays. Test have to be finished in 60 minutes. To test the visibility of the instrument, a First Trial had been done to a small number of students. Obtained data was quantitively analyzed using theMicroCatITEMAN program version 3.00 for the multiple choice to check reliability, level of difficulty, discriminating index and effectiveness of the distractor, while the essay was analyzed using the Microsoft Excel for reliability, level of difficulty, as well as discriminating index. The result shows that A type test consists of 43 % of items were accepted, 24% item revised, and 33 % rejected. While the B test package has 62% item were accepted, 33 % item were revised, and 5 % item were rejected

Penyusunan Instrumen Tes Higher Order Thinking Skill pada Materi Ekosistem SMA Kelas X

Penelitian ini bertujuan untuk menyusun instrumen tes Higher Order Thinking Skill pada materi ekosistem yang akan diujikan pada siswa SMA kelas X. Instrumen disusun berdasarkan langkah Riset Pengembangan Borg & Gall. Langkah pertama adalah menganalisis semua bentuk tes yang ada pada Ujian Nasional, Ulangan formatif dan sumatif, dan tes yang ada di dalam buku Biologi SMA dengan sampel SMA di Surakarta. Hasil analisis menunjukkan bahwa sebagian besar tes mencerminkan Kemampuan Berpikir Tingkat Rendah (LOTS). Langkah kedua adalah penyusunan draft Tes HOTS pada materi ekosistem yang terdiri dari 20 butir soal pilihan ganda yang akan dikerjakan dalam waktu 60 menit. Draft tes divalidasi oleh validator berkualifikasi dan guru. Instrumen tes selanjutnya diujikan pada sejumlah kecil siswa dalam Uji Coba Pertama. Hasil uji coba kesatu dianalisis secara kuantitatif menggunakan program MicroCat ITEMAN versi 3.00 yang digunakan untuk menentukan reliabilitas, taraf kesukaran, daya beda serta efektivitas distraktor. Berdasarkan hasil Uji Coba Tahap I diketahui bahwa instrumen tes Higher Order Thinking Skill pada siswa SMA kelas X untuk materi Ekosistem yang menunjukkan 45 % item diterima atau valid, 40% item direvisi dan 15% item ditolak. Proses revisi draft instrumen tes dan Uji Coba Tahap II dalam proses penyelesaian.

AC voltage regulation of a bidirectional high-frequency link converter using a deadbeat controller

This paper presents a digital controller for AC voltage regulation of a bidirectional high-frequency link (BHFL) inverter using Deadbeat control. The proposed controller consists of inner current loop, outer voltage loop and a feed-forward controller, which imposes a gain scheduling effect according to the reference signal to compensate the steady-state error of the system. The main property of the proposed controller is that the current- and the voltage-loop controllers have the same structure, and use the same sampling period. This simplifies the design and implementation processes. To improve the overall performance of the system, additional disturbance decoupling networks are employed. This takes into account the model discretization effect. Therefore, accurate disturbance decoupling can be achieved, and the system robustness towards load variations is increased. To avoid transformer saturation due to low frequency voltage envelopes, an equalized pulse width modulation (PWM) technique has been introduced. The proposed controller has been realized using the DS1104 digital signal processor (DSP) from dSPACE. Its performances have been tested on a one kVA prototype inverter. Experimental results showed that the proposed controller has very fast dynamic and good steady-state responses even under highly nonlinear loads