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Volume 5 Issue 4

S.No. Title & Authors Page No View
1

Title : 3D Printing of Metallic Implants

Authors : Tomasz Seramak, Katarzyna Zasinska, Andrzej Zielinski, Michal Gubanski

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Abstract :

The fabrication of various elements, solid and open porous structures of stainless steel and Ti alloy is described. The process was started with the design of 3D models in CAD/CAM  system. The 3D models were transformed into *.stl files and then the manufacturing process of the real structures by means of the selective laser melting with the SLM Realizer 100 3D printer was made. The paper shows the porous specimens made for possible application in medicine and the prosthetic bridges. The appropriate mechanical strength is the important property of porous structures for medical application and for curved prosthetic bridges it is necessary to take into account the thermal stresses, which appear during their SLM/DMLS manufacturing process.

01-04
2

Title : Historical Trend of Polycyclic Aromatic Hydrocarbons Contamination in Recent Dated Sediment Cores from The Imo River, Southeast Nigeria

Authors : Inyang O. Oyo-Ita , Orok E. Oyo-Ita

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Abstract :

The distribution and historical changes of polycyclic aromatic hydrocarbons (PAHs) contamination in recent sediment cores from the Imo River were evaluated over the last ca 5 decades. The concentrations of total PAHs (TPAHs-sum of parent and alkyl) ranging from 402.37 ng/g dry weight (dw) at the top layer of the Estuary site (ES6; 0-5 cm) to 92,388.59 ng/g dw at the near-top layer of the Afam site (AF5; 5-10 cm) indicated that PAHs contamination was localized not only between sites but also within the same cores. Sediment-depth profiles for the four (Afam-AF, Mangrove-MG, Estuary-ES and illegal Petroleum refinery-PT) cores generally revealed irregular TPAHs patterns, except the fact that the levels became maximized at the near-top layers (5-10 cm; ca.1997-2005). This time-frame coincided with the period of intensive oil bunkering/pipeline vandalism by the Niger Delta militant groups. The general decline in TPAHs levels up-cores to the most recent layers (0-5 cm) was attributed to the recent offer of amnesty to the Niger Delta militants and subsequent effort by the Nigerian government in clamping down the illegal activity of the economic saboteurs. Examination of perylene distributions down cores revealed natural terrestrial biogenic, pyrogenic and non-marine petrogenic origins for the compound at different sites. Thus, in view of the uncertainty surrounding the mechanism of perylene formation, the study highlighted the need for more attention to be paid to the involvement of terrigenous instead of aquatic OC in arriving at the probable mechanism for the compound.

05-24
3

Title : Analysis of Single RF Performance on MIMO-OFDM System Using Turbo Code and V-BLAST MMSE Detection

Authors : I Gede Puja Astawa, Rommy Aditya Pratama, Aries Pratiarso

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Abstract :

Along with the passing time and recent technology, the advancement of information technology has been increased in the wireless technology. The common methods that are used in this wireless communication are MIMO (Multiple Input Multiple Output) and OFDM (Orthogonal Frequency Division Multiplexing). MIMO is a system stands for a couple antenna on the transmitter and receiver which are working on themultipath component. While OFDM (Orthogonal Frequency Division Multiplexing) is a transmission method using multicarrier technique, dividing spectrum frequency into a couple subcarrier. The combination of MIMO and OFDM results in a high-speed transfer data system. The Single RF has reduced the usage of RF Front-End into a bigger matrix size in the conventional MIMO system. This final project will discuss about the Single RF system of MIMO-OFDM with the V-BLAST (Vertical Bell Laboratories Space-Time) and MMSE (Minimum Mean Square Error) detectionwhich is used to remove ISI (Intersymbol Interference) combined with theTurbo Code,where theTurbo Encoder that lies on the transmitter side is also theTurbo Decoder in the receiver side. MIMO-OFDM utilizesthe Single RF (Radio Frequency) basis. The test on this final project will include a Single RF antenna on the MIMO-OFDM system, MIMO-OFDM with the V-BLAST detector and MMSE MIMO-OFDM with the Turbo Code, by using 64 QAM modulation. The expected result is the analysis performance of the Single RF on the MIMO-OFDM system using Turbo Code and V-BLAST MMSEDetection. The system will be shown on theBit Error Rate (BER) toward the Signal to Noise Ratio (SNR).

25-30
4

Title : An Axiomatic System for a Physical or Digital but Continuous 3-Dimensional Euclidean Geometry, Without Infinite Many Points

Authors : Konstantinos E. Kyritsis

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Abstract :

This paper is concerned with finding an axiomatic system, so as to define the 3-dimensional Euclidean space, without utilizing the infinite ,that can imply all the known geometry for practical applied sciences and engineering applications through computers , and for more natural and perfect education of young people in  the Euclidean geometric thinking. In other words by utilizing only finite many visible and invisible points and only finite sets, and only real numbers with finite many digits, in the decimal representation. The inspiration comes from the physical matter , rigid, liquid and gaseous, which consists of only finite many  particles in the physical reality. Or from the way that continuity is produced in a computer screen from only finite many invisible pixels . We present such a system of axioms and explain why it is chosen in such a way. The result is obviously not equivalent, in all the details, with the classical Euclidean geometry.  Our main concern is consistency and adequacy but not independence of the axioms between them. It is obvious that within the space of a single paper, we do not attempt to produce all the main theorems of the Euclidean geometry, but present only the axioms.

31-43