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Volume 8, No. 2, 2015, 1436 H

 English Articles

 

 

Structural and Magnetic Properties of Pr0.7Bi0.3Mn1−xFexO3 (0 ≤ x ≤ 0.2) Manganites Oxides Prepared by Sol-gel Method
 

The morphology, structural and magnetic properties of Pr0.7Bi0.3Mn1-xFexO3 manganites oxides, prepared by sol-gel method, have been investigated to study the effect of the substitution of Mn by Fe. X-ray powder diffraction, Scanning Electron Microscopy (SEM), Fourier transforms infrared spectroscopy (FT-IR) and magnetic measurements for the systems have been investigated. Rietveld analysis of the X-ray powder diffraction show that the samples crystallize in the orthorhombic perovskite system with Pnma space group.  ...

 

Kh. Sbissi, D. Fatnassi, M. Ellouze, E. K. Hlil and       F. Elhalouani

JJP, 2015, 8(2) , 67-78

Electron Microscopy-Based Performance Evaluation of Various Tungsten Field-Emitter Tips Apex Radii

Field electron emission measurements have been performed on emitters consisting of electrochemically etched tungsten (W) wires, where the microemitters apex radii have been varied ranging from 90 to 300 nm. A conventional field electron microscope (FEM) with 10 mm tip (cathode)  screen (anode) distance was used to electrically characterize the electron emitters under ultra high vacuum (UHV) conditions.  ...

 

M. A. Madanat,            M. S. Mousa,               A. N. Al-Rabadi and    A. Fischer

JJP, 2015, 8(2) , 79-85

COLTRIMS Imaging of Molecular Fragmentation Dynamics of CO Molecules Induced by Slow He2+ Ions

We study the multiple ionization and fragmentation of CO in collisions with slow He2+ ions. Correlated measurements of all fragment ions and the projectile final charge state were performed using our coincidence COLTRIMS imaging technique coupled to projectile charge state separation. Complete fragmentations of CO, following double electron capture, into Cm++On+ with a total charge of 4 were investigated. ...

 

Feras R. Afaneh

JJP, 2015, 8(2) , 87-93

Investigating the Effects of Sample Conditioning on Nano-Apex Carbon Fiber Tips for Efficient Field Electron Emission

Carbon fibers represent a very interesting material for field electron emitters. While the preparation of sharp carbon fiber tips is very similar to the conventional method used for tungsten tips, much smaller apex radii can be obtained. Within the study presented here, such emitters have been prepared and tested using a standard field emission microscope (FEM). Various properties of these emitters were measured including the relationship between emitted electron current and applied voltage to the tip (the current-voltage characteristics) and the corresponding electron emission images.  ...

 

S. Alnawasreh,              M. S. Mousaa and           A. N. Al-Rabadib

 

JJP, 2015, 8(2) , 95-101

The Effect of Z907 Dye on the Performance of Solar Cells Based on the Nc-TiO2 Semiconducting Polymer Heterojunction

This work studies the effect of cis-bis(isothiocyanato)(2,2'-bipyridyl-4,4'-dicarboxylato)(4,4'-di-nonyl-2'-bipyridyl) ruthenium(II) (Z907 dye) on the performance of nanocrystalline titanium dioxide (nc-TiO2)/Poly3-hexylthiophene (P3HT) heterojunction solar cells. Specifically, the P3HT/Z907dye/nc-TiO2 solar cells increase the short circuit current, Jsc, from 0.17 mA/cm2 to 0.3 mA/cm2, the open circuit voltage, Voc, from 0.45 V to 0.7 V and the power conversion efficiency, η, from 0.03% to 0.08% compared with the P3HT/nc-TiO2 solar cells. ...

 

H. Al-Dmour

JJP, 2015, 8(2) , 103-111

 

 

Effect of Dust and Ambient Temperature on PV Panels Performance in Egypt

This study investigated the effects of dust deposition and ambient air temperature on the performance of a thin film photovoltaic module under real outdoor conditions in the humid harsh climate of Egypt. The experimental study investigated the effect of dust deposition and the effect of ambient air dry bulb temperature on the performance of the PV module. Theoretical study predicted the temperature of the PV panels at various metrological conditions in different locations inside Egypt. ...

 

Ahmed Hamza H. Ali, Ahmed. M. Serag ElDin and S. M. Abdel-Gaied

JJP, 2015, 8(2) , 113-124