El Battay A.,Gulf University |
Mahmoudi H.,International Center for Biosaline Agriculture
IOP Conference Series: Earth and Environmental Science | Year: 2016
The soils of the GCC countries are dominantly sandy which is typical of arid regions such as the Arabian Peninsula. Such soils are low in nutrients and have a poor water holding capacity associated with a high infiltration rate. Soil amendments may rehabilitate these soils by restoring essential soil properties and hence enable site revegetation and revitalization for crop production, especially in a region where food security is a priority. In this study, two inorganic amendments; AustraHort and Zeoplant pellet, and one organic locally produced compost were tested as soil amendments at the experimental field of the International Center for Biosaline Agriculture in Dubai, UAE. The main objective is to assess the remote sensing ability to monitor crop growth, for instance Okra (Abelmoschus esculentus), having these amendments, as background with the soil. Three biomass spectral vegetation indices were used namely; NDVI, TDVI and SAVI. Pure spectral signatures of the soil and the three amendments were collected, using a field spectroradiometer, in addition to the spectral signatures of Okra in two growing stages (vegetative and flowering) in the field with a mixed F.O.V of the plant and amended soil during March and May 2015. The spectral signatures were all collected using the FieldSpec® HandHeld 2 (HH2) in the spectral range 325 nm - 1075 nm over 12 plots. A set of 4 plots were assigned for each of the three amendments as follow: three replicates of a 1.5 by 1.5 meter plot with 3kg/m2 of each amendment and 54 plants, one plot as control and all plots were given irrigation treatments at 100% based on ETc. Spectra collected over the plots were inversed in the range of 400-900 nm via a Linear Mixture Model using pure soil and amendments spectral signatures as reference. Field pictures were used to determine the vegetation fraction (in term of area of the F.O.V). Hence, the Okra spectral signatures were isolated for all plots with the three types of amendments. The three vegetation indices were then calculated and compared in the vegetation fraction of the entire F.O.V. The key outcome of this analysis was that a considerable bias was induced when using a mixed F.O.V. In fact, the compost as an organic soil amendment containing dead vegetation affects similarly the sensitivity of the three vegetation indices in the vegetative stage of Okra compared to AustraHort and Zeoplant pellet amended plots. However, the TDVI is very sensitive to vegetation presence even with unmixed crop spectra. AustraHort amendment led to better status of Okra both in March and May with values of 0.19 and 0.28 respectively. Bias induced by some soil amendments can be misleading when upscaling spectral information to satellite imagery with low spectral and spatial resolutions. The results obtained are encouraging for further use of spectral information for crop monitoring in soil containing amendments.
Dutreil S.,Tulane University |
Rice J.,Tulane University |
Merritt D.,Childrens Hospital of Michigan |
Kuebler E.J.,Gulf University
Haemophilia | Year: 2011
The Parents Empowering Parents (PEP) Program gives parents tools to improve the lives of children with bleeding disorders. The aim of this study was to evaluate the efficacy of PEP. Eleven haemophilia treatment centres (HTC) participated in the study and 301 participants completed the survey. Parents who did not attend PEP were divided into three groups based on their reasons for not attending: (Not Offered, Bad Time and Don't Need). Those who attended (Attended) PEP reported less use of yelling, spanking, slapping and giving-in after attending PEP. The Not Offered group used Praising (P=0.016), Natural Consequences (P=0.002), Being Consistent (P=0.016), Ignoring (P=0.006), Distracting (P=0.002), Setting Limits (P=0.009), Giving Choices (P=0.049), Being Consistent (P=0.014) and Distracting (P=0.019) less than all other groups. The Bad Time group used Time-Out (P=0.037) and Ignoring (P=0.019) more than the other groups that did not attend PEP. The Don't Need group used Spanking (P=0.008) and Time-Out (P=0.003) and Yelling (P=0.014) less than all other groups. Attending PEP seems to decrease the use of negative parenting techniques. Those who reported PEP was not offered to them used positive parenting techniques less than all other participants. © 2011 Blackwell Publishing Ltd.
Mahmoud S.,Gulf University |
Mahmoud S.,Helwan University |
Abd-Elhamed A.,Helwan University |
Jankowski R.,Technical University of Gdansk
Bulletin of Earthquake Engineering | Year: 2013
The present paper investigates the coupled effect of the supporting soil flexibility and pounding between neighbouring, insufficiently separated equal height buildings under earthquake excitation. Two adjacent three-storey structures, modelled as inelastic lumped mass systems with different structural characteristics, have been considered in the study. The models have been excited using a suit of ground motions with different peak ground accelerations and recorded at different soil types. A nonlinear viscoelastic pounding force model has been employed in order to effectively capture impact forces during collisions. Spring-dashpot elements have been incorporated to simulate the horizontal and rotational movements of the supporting soil. The results of the numerical simulations, in the form of the structural nonlinear responses as well as the time-histories of energy dissipated during pounding-involved vibrations, are presented in the paper. In addition, the variation in storeys peak responses and peak dissipated energies for different gap sizes are also shown and comparisons are made with the results obtained for colliding buildings with fixed-base supports. Observations regarding the incorporation of the soil-structure interaction and its effect on the responses obtained are discussed. The results of the study indicate that the soil-structure interaction significantly influences the pounding-involved responses of equal height buildings during earthquakes, especially the response of the lighter and more flexible structure. It has been found that the soil flexibility decreases storey peak displacements, peak impact forces and peak energies dissipated during vibrations, whereas it usually leads to the increases in the peak accelerations at each storey level. © 2013 The Author(s).
Alfarras M.,Gulf University
2nd International Conference on Computer Research and Development, ICCRD 2010 | Year: 2010
The paper focuses exclusively on a new proposed model, which is joining equalizer with serial turbo code over a mobile frequency selective channel. The separation between equalizer and decoder is presented in the system for comparison, where there is no feedback connection between them. The proposed model depends on a Log-MAP algorithm. Therefore some modifications of Soft In Soft Out SISO output in the SC3 decoder with the use of puncturing and depuncturing enhancement by using new connection buffer. The proposed model uses hard decision bit for LLR code output bit and feedback to the non-linear equalizer. The gain earned at different frame length and different number of iterations is around 0.25 dB. This gain is earned form joining the priori code bits LLR with the decoder to be a feedback to the non-linear equalizer. These bits enhance the decision for non-linear equalizer leading to canceling the ISI iteratively. © 2010 IEEE.
Alghurair D.,Higher Institute for Telecommunication and Navigation |
Al-Rawi S.S.,Gulf University
2013 The International Conference on Technological Advances in Electrical, Electronics and Computer Engineering, TAEECE 2013 | Year: 2013
The last decade has a rapid development in the structure of a programmable processor called Field Programmable Gate Array (FPGA), which is used to implement a hardware circuit to perform the functions for high speed application. Sobel edge detection is a method to find the edge pixels in an image. This method exploits the change in intensity with respect to neighboring pixels. This paper introduces the implementation of Sobel edge detection method in the FPGA processor [1,2]. The implementation is performed based on two FPGA families from Xilinx, Spartan and Virtex. The cost of these implementations using Spartan3 is 41.66%, Spartan6 is 70%, Virtex5 is 3.69% and Virtex6 is 3.61%. The frequency is 169.188 MHz for using Spartan3, 45.7 MHz for Spartan6, 85.060 MHz for Virtex5 and 65.8 MHz for Virtex6. © 2013 IEEE.
Al-Khalidy M.M.M.,Gulf University
Saudi International Electronics, Communications and Photonics Conference 2011, SIECPC 2011 | Year: 2011
The main contribution of this paper is to present and discusses a new approach for development of a kinematics model and control strategy for a Nonholonomic Wheeled Mobile Robot WMR. Dynamic model is involved, the linearization of the model is also presented, and stability analysis is discussed. Extensive simulation results for the proposed controller are presented. © 2011 IEEE.
Walker C.M.,Indiana University of Pennsylvania |
Sockman B.R.,East Stroudsburg University |
Koehn S.,Gulf University
TechTrends | Year: 2011
Understanding the covert events surrounding the undergraduate students' experience is essential to educators' and counselors' involvement in their success. Research into bullying behaviors has documented victims' feelings of anger, sadness and poor concentration. Affordable technologies have propagated this concern into cyberspace. This exploratory study evaluated the instances of cyberbullying experienced by undergraduate students. Additionally, the forms of technology utilized in cyberbullying were queried. A 27-item survey was distributed to 120 undergraduate students in social science, technology and education departments. The majority of all respondents (54%) and 100% of male respondents indicated they knew someone who had been cyberbullied. The perpetrators primarily used cell phones, Facebook and instant messaging. The study results provide legitimate concerns regarding the undergraduate students' exposure to cyberbullying and numerous areas for future research. © 2011 Springer Science+Business Media, Inc.
Hamza R.M.A.,Gulf University
Journal of Engineering Science and Technology | Year: 2011
An effective stud weld algorithm has been developed using a tensile strength response. A multi objectives neural network modeling was used to get higher tensile strength with lower variance. A multi-layer perception (MLP) was trained by back propagation Levenberg-Marquardt (LM) [8:16:2] algorithm using sample testing measures. The result was compared with Taguchi experimental design method. The comparison shows that neural network is an effective method to represent this multi objective target problem. The verification of results shows that the ultimate tensile strength increases by (30.84 per cent) and the standard deviation around mean reduces by (30.06 per cent).The results prove that neural network is a powerful tool to represent the multi level eight input parameters with two objectives first is to maximize the ultimate tensile strength and the second is to minimize the standard deviation of tensile strength with almost negligible error (4.96 ×10-10) for representing data. © School of Engineering, Taylor's University.
Emara E.M.,Cairo University |
Imam H.,Cairo University |
Hassan M.A.,Gulf University |
Elnaby S.H.,Cairo University
Talanta | Year: 2013
Analysis of trace elements in mammalian hair has the potential to reveal retrospective information about an individual's nutritional status and exposure. As trace elements are incorporated into the hair during the growth process, longitudinal segments of the hair may reflect the body burden during growth. Using LIBS technique, Na, K, Ca, Mg, Si, Fe, Pb and Zn were detected in a single strand of horse hair. The results obtained through LIBS technique on hair samples were compared with the traditional technique (AAS) on digested acidified solution of the same samples. The effects of the experimental parameters on the emission lines were studied and the local thermodynamic equilibrium (LTE) in produced plasma was investigated. The transient plasma condition was verified at specific time region (1500-2000 ns) in the plasma evolution corresponding to its dynamic expanding characteristic. The relative mass concentrations of Fe and Zn were calculated by setting the concentration of C as the calibration. The information obtained from the trace elements' spectra of horse hair in this study substantiates the potential of hair as a biomarker. © 2013 Elsevier B.V. All rights reserved.
Alani M.M.,Gulf University
SoftCOM 2010 - International Conference on Software, Telecommunications and Computer Networks | Year: 2010
This paper focuses on the quality parameters of Voice over Wireless Local Area Network (VoWLAN) and how they are affected by the addition of end-to-end encryption using Advanced Encryption Standard (AES) of 128-bits and 256-bits block sizes. An experimental setup was made to evaluate mean and maximum delay and jitter, and packet loss. These quality parameters were measured for non-encrypted streams, AES 128-bit encrypted streams, AES 256-bit encrypted streams for the CODECs; G,711, G.729, and G.723.1. The encryption was applied to Real-time Transport Protocol (RTP) payload. The tests showed that encryption affects the delay noticeably for high-bit-rate CODECs, such as G.711. G.729 streams delay was less affected, and the delay of G.723.1 streams was even less affected. Jitter and packet loss were not highly affected by the addition of encryption. The results also showed that 256-bit AES encryption causes less delay despite the fact that it needs longer calculations that the 128-bit AES. This is due to the fact that larger block size causes less number of repetitions to encrypt a complete payload field of an RTP packet. It was also concluded that the use of G.723.1 with AES encryption is more recommended in VoWLAN because it has better quality measures.