Comparative study on structural, electrical transport and magnetic properties of cr-doped in charge-ordered Pr0.75Na0.25Mn1-Xcrxo3 and Nd0.75Na0.25Mn1-Ycryo3 manganites

Cr doping in charge-ordered Pr0.75Na0.25Mn1-xCrxO3 and Nd0.75Na0.25Mn1-yCryO3 have been synthesized using conventional solid-state method to investigate its effect on structural, electrical transport and magnetic properties. X-ray diffraction (XRD) analysis for both compounds showed that the samples were crystallized in an orthorhombic structure with Pnma group. The unit cell volume value decrease as the Cr-doped increased indicating the possibility of Mn3+ ion was replaced by Cr3+ due to the different of ionic radius. The temperature dependence of electrical resistivity showed an insulating behavior down to the lower temperature the both parent compound (x = 0 and y = 0). Successive substitution of Cr at Mn-site in Pr0.75Na0.25Mn1-xCrxO3 manganites induced the metal-insulator (MI) transition temperature around TMI~120 K and TMI~122 K for x = 0.02 and x = 0.04 samples respectively suggestively due to the enhancement of double-exchange (DE) mechanism as a result of suppress the CO state. Analysis of resistivity data of dlnρ/dT-1 vs. T in Nd0.75Na0.25Mn1-yCryO3 manganite, showed a peak around 210 K and 160 K for y = 0 and 0.02 samples respectively while no peak was observed for y = 0.05 sample indicate the charge-ordered (CO) weakened. AC susceptibility, χ ’ measurements in Pr0.75Na0.25Mn1-xCrxO3 exhibits paramagnetic to ferromagnetic-like with curie temperature, TC increases from 132 K for x = 0.02 to 141 K for x = 0.04 with Cr content indicate the suppression of CO state meanwhile in Nd0.75Na0.25Mn1-yCryO3 showed paramagnetic to anti-ferromagnetic transition as Neel temperature TN increases from 115 K for y = 0.02 to 125 K for y = 0.05

Acknowledgments(<Special Issue>Mediating Identities in a Changing Malaysia)

この論文は国立情報学研究所の学術雑誌公開支援事業により電子化されました

Derivation of BBDF-α for solving ordinary differential equation

In this paper, the block backward differentiation formulas with parameter α (BBDF-α) of order three is derived in a constant step size for solving system of first order ordinary differential equations (ODEs). The coefficients of formula are generated using Maple software package. The influence of parameter α is considered to produce better approximate solutions at two points simultaneously. Numerical experiment is included to show the capability of the derived method in solving ODEs. Numerical results indicate that the BBDF-α outperforms the existing methods in term of accuracy

Editorial Preface

It is with great pleasure that we present the 3rd issue of Volume 9 of the International Journal of Integrated Engineering (IJIE). This edition features the latest findings and research in the area of Civil and Environmental Engineering, Electrical and Electronic Engineering and Mechanical, Materials and Manufacturing Engineering.This issue contains eleven articles. The first article proposed a new solution, named RRFAST, to overcome rerouting problem of FAST TCP. The second article aimed to study and assess the diameter and displacement of the carotid arterial wall movement from B-mode ultrasound image for the early detection of atherosclerosis. The third article presented a Multi-Criteria Decision Making (MCDM) tool for prioritising alternative solutions to power generation problems. The fourth article focused on determining the characteristics of the spray produced in the simulation of spray biodiesel using constant volume chamber by using computational fluid dynamic (CFD). The fifth article presents a development of a temperature control system by means of the proportional controller to control the temperature inside the mini container during the NIRS data acquisition process. In the sixth article, the authors developed a single phase inverter that is used to understand the concept of inverting voltage output control using Raspberry Pi as the microcontroller. In the seventh article, the authors present their finding on the capability of peat soil (PS) and activated carbon (AC) as a potential composite adsorbent for the removal of colour and Fe from a stabilized landfill leachate. The eighth article presents the design and development of a simple and low cost interactive rehabilitation module for stroke patients. In the ninth article, the authors share their findings on the combination of Charge-Coupled Device (CCD) and laser diode with LabVIEW software on Optical Tomography System (OTS) for monitoring multiphase flow. In the tenth article, the authors examined the effect of different spatial filters performance towards mammogram de-noising. In the last article, the authors report on the efficiency of coagulation and flocculation process in the removal of suspended solids, colour, Chemical Oxygen Demand (COD) and Oil and Grease using ferric chloride and ferric sulfate for the treatment of biodiesel wastewater.We would like to extend our sincere gratitude and appreciation for the enthusiastic and vigorous support and contributions from the Editorial Board and Reviewers of IJIE for taking time and effort to review manuscripts. As no manuscript is accepted or rejected without careful reading by experts in a particular area to which the paper is related. The experts have maintained a high standard of scholarship and we believe the readers of this Journal deserves.It is our hope that this fine collection of articles will be a valuable resource for International Journal of Integrated Engineering (IJIE) readers and will stimulate further research in the area of Civil and Environmental Engineering, Electrical and Electronic Engineering and Mechanical, Materials and Manufacturing Engineering. We strongly encourage authors to submit their articles and readers to provide feedback. In order to access the online version of this issue along with archived editions please visit our website http://penerbit.uthm.edu.my/ojs/index.php/ijie/. We would like to thank all the authors who have contributed manuscripts in IJIE and those who are awaiting their manuscripts for publication in subsequent issues

Block backward differentiation formulas for solving fuzzy differential equations under generalized differentiability

In this paper, the fully implicit 2-point block backward differentiation formula and diagonally implicit 2-point block backward differentiation formula were developed under the interpretation of generalized differentiability concept for solving first order fuzzy differential equations. Some fuzzy initial value problems were tested in order to demonstrate the performance of the developed methods. The approximated solutions for both methods were in good agreement with the exact solutions. The numerical results showed that the diagonally implicit method outperforms the fully implicit method in term of accuracy

Convergence properties of pth order diagonally implicit block backward differentiation formulas

This paper investigates the convergence properties for diagonally implicit 2-point block backward differentiation formulas of order two, three and four. The formulation of the method is reviewed from the literature. The order of the method is verified. The concepts of consistency and zero stability are considered to prove the convergence of the method

Editorial Preface

This special issue of International Journal of Integrated Engineering contains 27 papers contributions by post-graduate students in Universiti Tun Hussein Onn Malaysia (UTHM). All contents provide deep research results on various fields of engineering such as in Mechanical and Manufacturing Engineering, Electrical and Electronic Engineering and Civil and Environmental Engineering. These papers are selected from the post-graduate seminar in 2017 and they are experienced two-stage peer-review (reviewed by the Centre of Graduate Studies and Editorial boards).Â

Editorial Preface

This is the first volume of year 2018 which contained of three main engineering fields such as Mechanical and Manufacturing, Civil and Environmental and Electrical and Electronic Engineering. In this volume there are 30 number of papers published and indexed mainly in SCOPUS, GOOGLE SCHOLAR and Malaysia Citation Centre (MCC). It is about 30% of these papers came from international authors and the number is growing. Editorial board and the Penerbit UTHM would like to express their appreciation to national and international authors who have contributed their work to the world of knowledge. Lastly, we would also like to thank all reviewers who make the supportive reviews, comments and suggestions in order to enhance the quality of this journal. In order to access the online version of this issue along with archived editions please visit our website http://penerbit.uthm.edu.my/ojs/index.php/ijie/

Editorial Preface

It is with great pleasure that we present the 4th regular issue of Volume 10 of the International Journal of Integrated Engineering (IJIE). This edition features the latest findings and research in the area of Civil and Environmental Engineering, Electrical and Electronic Engineering and Mechanical, Materials and Manufacturing Engineering.We would like to extend our sincere gratitude and appreciation for the enthusiastic and vigorous support and contributions from the Editorial Board and Reviewers of IJIE for taking time and effort to review manuscripts. As no manuscript is accepted or rejected without careful reading by experts in a particular area to which the paper is related. The experts have maintained a high standard of scholarship and we believe the readers of this Journal deserves.It is our hope that this fine collection of articles will be a valuable resource for International Journal of Integrated Engineering (IJIE) readers and will stimulate further research in the area of Civil and Environmental Engineering, Electrical and Electronic Engineering and Mechanical, Materials and Manufacturing Engineering. We strongly encourage authors to submit their articles and readers to provide feedback. In order to access the online version of this issue along with archived editions please visit our website http://penerbit.uthm.edu.my/ojs/index.php/ijie/.We would like to thank all the authors who have contributed manuscripts in IJIE and those who are awaiting their manuscripts for publication in subsequent issues