Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : structure

Push–out Test of Timber Concrete Composite Construction

Ihab S. Saleh; Nabeel A. Jasim; Anis A. Mohhamed Ali

Engineering and Technology Journal, 2022, Volume 40, Issue 5, Pages 668-676
DOI: 10.30684/etj.v40i2.2175

In this study, push – out test specimen is proposed to explore the behavior of shear connectors in timber–concrete composite beams. Since there are no standard shapes and dimensions for determining the strength of connectors, push–out specimens such as those used for steel-concrete composite beams are suggested to study the behavior of connectors in timber concrete composite beams. Four specimens are tested. Two of these specimens are with one connector per side. The other two are with two connectors per side. The load and slip are recorded during testing. The results show that the ultimate load per connector ranges from 24.9 kN to 29.4 kN, with an average value of 26.9 kN. An equation is proposed to determine the ultimate load of the connector. Good agreement is achieved between the theoretical and experimental results. An average value of 0.98 is obtained for theoretical to experimental results.

Preparation of NanostructureTiO2 at Different Temperatures by Pulsed Laser Deposition as Solar Cell

Amin Daway Thamir; Adawiya J. Haider; Ghalib A.Ali

Engineering and Technology Journal, 2016, Volume 34, Issue 2, Pages 193-204
DOI: 10.30684/etj.2016.112609

Deposition of the Titanium oxide (TiO2) particles on glass and the Si substrates was materialized for a wide range of temperatures (100-400)°C; using PLD technique at constant laser energy 800 mJ of frequency doubled Nd: YAG laser wavelength of 532nm running at 10 Hz rate and 10ns duration pulses. UV-Vis spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD), X-ray fluorescence (XRF), Scanning Electron Microscopy (SEM), Atomic Force Microscope(AFM), electrical conductivity (σdc), Hall coefficient (RH) and (I-V) and (C-V) measurements were employed to examine optical, morphological and electrical properties of the deposited films. 85% film transparency was accomplished with optical band gap of (3.25 – 3.64) eV.(I-V) characteristics showedan enhanced TiO2 p-n junction thin film solar cell efficiency by 1.6% at 400°C.

Effect of Deposition Temperature and Ph Value on Structure, Optical and Electrical Properties of Cdo Prepared by CBD

Selma M.Hassan Al-Jawad; Hadia Kadhim J.Alogili

Engineering and Technology Journal, 2013, Volume 31, Issue Issue 2 B, Pages 194-215
DOI: 10.30684/etj.31.2B.7

In this work CdO films were prepared by using chemical bath deposition, which is a simple and inexpensive technique suitable for large deposition area. Many growth parameters have been considered in this work to specify the optimum condition, namely (deposition temperature, and pH value). Structure and electrical properties of CdO films are investigated and analyzed extensively with respect to growth conditions. The high conductivity and high visible transmission (> 80%) make the films suitable for use in the transparent electrodes.

Influence of Flap Angle on the Aeroelastic Behavior of Wing- Flap Configuration Using Fully Coupled Structure-Fluid Interaction Model

Mauwafak A. Tawfik; Mohammed I. Abu-Tabikh; Hayder S. Abd Al-Amir

Engineering and Technology Journal, 2011, Volume 29, Issue 7, Pages 1290-1307

The influence of trailing edge flap angle on the aeroelastic behavior of a vibrating
wing-flap configuration is investigated in this work. For this purpose an aeroelastic
numerical model with fully coupled structure-fluid interaction is developed. The flow
and structural solvers are coupled via successive iterations within each physical time
step. The aerodynamic model is based on a hybrid unsteady panel method which is still
a good approach to calculate the unsteady loads. While the nonlinear plate equation
solved by an assumed mode method is used to represent the structure wing model. The
results for a vibrating rectangular wing-flap configuration in low subsonic attached
flow are presented, including the effect of flap angle on the unsteady pressure
coefficient, time history of lifting coefficient and aeroelastic behavior of the wing.
These results clearly show the effect of strong structure-fluid interaction and illustrate
the utility of the present model which may be used in the preliminary stage of the wing