oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 16 )

2018 ( 134 )

2017 ( 111 )

2016 ( 150 )

Custom range...

Search Results: 1 - 10 of 51515 matches for " Jamal Y. Ayad "
All listed articles are free for downloading (OA Articles)
Page 1 /51515
Display every page Item
Variation in Root Water and Nitrogen Uptake and their Interactive Effects on Growth and Yield of Spring Wheat and Barley Genotypes
Jamal Y. Ayad,Ayed M. Al-Abdallat,Hani M. Saoub
International Journal of Botany , 2010,
Abstract: The study was conducted to investigate the effects of water and nitrogen on growth and to identify root traits that improve crop water and nitrogen uptake of wheat and barley genotypes at the Faculty of Agriculture Research Station, University of Jordan, Amman, during 2007. Two barley genotypes (Hordeum vulgare L., Vars Rum and ACSAD 176) and two wheat genotypes (Triticum turgidum L. var. durum, vars. Hourani and Om Qaise were subjected to two water treatments (rain-fed and rain-fed plus supplementary irrigation) and three nitrogen levels of 0, 50 and 100 kg N ha-1. Barley produced higher above ground dry matter and Green Area Index (GAI) and leaf area ratio than wheat at anthesis stage. Root Length Density (RLD) was affected by genotype and nitrogen at depths from 0-80 cm. The effect of irrigation on root characteristics was only at depths below 20 cm where rainfed treatments produced higher RLD and root weight as compared to irrigation treatments. Results also showed an exponential decrease in RLD of various genotypes with soil depth. Barley vars had higher root weight and RLD than wheat vars especially at soil depths of 0-40 cm. Positive relationship between RLD and water and nitrogen used by wheat and barley plants was observed. Root water capture rate was higher for barley under irrigation by 4.5 folds as compared to rain-fed. On the other hand, stronger association between RLD and nitrogen uptake were observed for wheat genotypes under both rainfed and under irrigation as compared to barley.
Effect of Three Water Harvesting Techniques on Forage Shrub and Natural Vegetation in the Badia of Jordan
Hani M. Saoub,Raed Al Tabini,Khaled Al Khalidi,Jamal Y. Ayad
International Journal of Botany , 2011,
Abstract: The current study aimed to investigate the effect of three water harvesting techniques on the establishment of three forage shrubs and productivity of natural vegetation at Tal Rimah (N32 17' E36 53'), North-eastern Badia of Jordan. Three forage shrub species (Atriplex nummularia, Atriplex halimus, Salsola vermiculata) were planted. The effect of three water-harvesting techniques: Contour furrows, crescent-shaped and V-shaped micro-catchments was studied on biomass production and natural vegetation. The results showed that using contour furrows gave higher shrub biomass when compared to the crested and v-shaped techniques. Moreover, both Atriplex species produced higher average biomass (350 kg ha-1) than S. vermiculata (62 kg ha-1), which was clearly shown in 2006. Protection of the study site for 3-4 years improved shrub production of A. nummularia from 23 kg ha-1 in 2002 to 37 kg ha-1 in 2006. Plant survey of the natural vegetation also indicated an increase in the number of families (18) and species (51) in the protected areas. Concluding that, for rangeland rehabilitation in the Badia of Jordan, it is important to establish reserves with the emphasis on sustainable management such as protection from grazing for 2-3 years and using water-harvesting techniques.
Synthesis, Characterization and Metal Ion Chelating Efficiency of an Environment-Friendly Copolymers Containing Dithio Formic Acid and Thiosemicarbazide or 1,2,4-Triazole Group  [PDF]
Ayad Hameed
International Journal of Organic Chemistry (IJOC) , 2013, DOI: 10.4236/ijoc.2013.31002
Abstract:

Six phenolic monomers (M1 - M6) have been synthesized, namely, potassium-3-(ortho,para)-hydroxy benzoyl dithiofor- mate (M1 and M2), (ortho,para)-(4-amino-5-mercapto-1,2,4 triazol-3-yl)-phenol (M3 and M4), (ortho,para)-hydroxy benzoic acid thiosemicarbazide (M5 and M6) and twelve novel chelating terpolymers (P1 - P12) were synthesized by ter- polymerization condensation reaction of these monomers with phenol or bis phenol-A and excess of formalin in basic medium. The monomers (M1 - M6) and their co-polymers (P1 - P12) were characterized by FT.IR, H1-NMR, elemental analysis and thermal analysis (TGA) and according to data obtained the structures of these compounds were proposed. Analytical evaluation of chelating selectivity of these polymers toward (Co2+, Cr3+, Cu2+, Cd2+, Pb2+) were achieved by batch equilibrium method, the results show that all synthetic resins have high efficiency toward (Cr3+) and less effi- ciency toward (Co2+, Cu2+, Cd2+ and Pb2+).

 

Design of Locally E-management System for Technical Education Foundation- Erbil
Ayad Ghany Ismaeel,Dina Y. Mikhail
Computer Science , 2014,
Abstract: Until now, there is no e-management and automation necessary for the operations or procedures of the departments in the Technical Education Foundation Erbil, and the foundation like any other organization in Kurdistan region is not connected to the network, because there is not infrastructure for that purpose. To solve this problem, comes the proposal DLMS4TEF, which requirements are divided into hardware and software, as hardware will need Fast-Ethernet (LAN) technology to connect the departments of the Foundation via Client-Server network later, when an infrastructure is established for e-governments or e-management, it may be extended to the campus network. The software is represented by installing windows server to implement the proposal design of DLMS4TEF, PHP script is used as web programming that supports the server, where as the HTML and JavaScript are used to support the client side. The dynamic DLMS4TEF will be based on relational database, which is created by using MySQL, to support processing hundreds of queries per second, and the Kurdish Unicode to support Kurdish fonts of GUI's, Moreover, for security DLMS4TEF allows each department in the Foundation to enter its own section and prevent accessing other sections by using HTAccessible program which allows the user to access by using his IP address and his computer only. The important conclusions and advantages of applying DLMS4TEF are making backup to DLMS4TEF's databases using the option (zipped) which allows them to reach the size of (3%) of the original database size, sufficient security techniques, through achieving levels of security, hidden access to the administrator section, and finally DLMS4TEF, when compared with the traditional methods and project of Oman, shows the same efficiency of some, if not better, features of Oman. Keywords- E-management, Client-Server network, Fast-Ethernet, PHP, MySQL
Kinetic Studies and Sensorial Analysis of Lactic Acid Bacteria Isolated from White Cheese Made from Sheep Raw Milk
Jamal S.Y. Haddadin
Pakistan Journal of Nutrition , 2005,
Abstract: Eighteen presumptive isolates of lactic acid bacteria, from local white cheese made from sheep raw milk were isolated and identified. The results of the standard physiological and biochemical tests identified three isolates of Lactobacillus plantarum, two isolates of Lactobacillus buchneri, three isolates of Lactobacillus brevis, six isolates of Lactobacillus fermentum, two isolates of Lactobacillus casei and two isolates of Lactococcus lactis. Results of this study indicated that the presence of heterofermentative Lactobacillus in raw milk with variable levels of contamination and frequency. The results classified the isolated strains into three groups according to their rate of coagulation. Glucose, galactose and yeast extract were added to skim milk because it was found that milk has poor acidification process.
Effects of Water Stress Conditions and Plant Growth Regulators on Growth, Yield and Yield Components in Durum Wheats (Triticum turgidum L. var. Durum) under the Jordan Conditions
Al-Tabbal Jalal Ahmed,Y. Ayad Jama
Journal of Agronomy , 2007,
Abstract: Greenhouse and field studies were conducted at the University of Jordan Research Station during 2000/2001 growing season to examine the influence of Mepiquat Chloride (1,1-dimethyl piperidinium Chloride) and Ethephon (2-chloroethyl-phosphonic acid) on growth, yield and water use efficiency of two selected wheat cultivars (Namely, Hourani 27 and Petra, Triticum turgidum L. var. Durum). In greenhouse pot experiments, seeds of wheat cultivars were soaked in Mepiquat Chloride solution at a rate of 0, 250, 500 and 750 mg kg-1 in one experiment. Ethephon was sprayed independently at a rate of 0, 150, 300 g ha-1 at the Zadoks 10 and 20, respectively in a second experiment. Plants in both experiments were subjected to two moisture levels: No stress and water stress for the entire growth period of the two cultivars. In field experiments, Ethephon solutions was sprayed independently at a rate of 0, 150, 300 and 450 g ha-1 at the Zadoks 10, 20 and 30, respectively in the first experiment. Seeds of both cultivars were soaked in Mepiquat Chloride solution at a rate of 0, 250, 500, 750 and 1000 mg kg-1 in a second experiment. Mepiquat Chloride and Ethephon treatment had no influence on shoot: root ratio of cultivars. Grain yield of cultivars grown either under well water or water stress conditions increased with Mepiquat Chloride treatment. Ethephon treatment only increased grain yield and harvest index of Hourani cultivar under well-watered conditions in both greenhouse and field experiments. This might be attributed to the increase in the number of fertile tillers per plant.
Analysis of Fatigue and Fracture of Hot Mix Asphalt Mixtures
Mohammad Jamal Khattak,Gilbert Y. Baladi
ISRN Civil Engineering , 2013, DOI: 10.1155/2013/901652
Abstract:
Nutritional values of wild rusa deer (Cervus timorensis) venison
Y Jamal,G Semiadi,M Hamsun
Journal of Animal Production , 2005,
Abstract: Until 2002, the level of protein consumption from red meat origin by the Indonesian people was only 51.5% from the national target. The reasons for this condition were due to limited resources of domesticated animals and low income of many suburb people to buy red mead. One alternative in supplying the gap of protein consumption is by utilizing local prospective wildlife animals, such as deer. This species is widely distributed among the islands in Indonesia. In order to understand more on the quality of tropical rusa venison (Cervus timorensis), a study was conducted in Palu district, Southeast Sulawesi by collecting venison from hunters. The results showed there was no significant difference on cooking lost among the carcass parts (hind leg, front leg and saddle), with the range between 30.3 to 33.0%. There were also no significant differences on the gross energy, protein, ash, fat and phosphor values among the carcass parts. The contents of sodium , ferum and calcium were significantly different at p<0.05. In fatty acid contents, there was no interaction between the carcass parts and fatty acid groups, however among the fatty acid groups there was a significant difference (p<0.001) on the content. Palmitic and stearic acid had the highest contents (>9.5% DM), compared to other groups (<4.0% DM). In amino acid contents , it showed no interaction between the carcass parts to amino acid groups, however there was a significant difference among the amino acid groups. Glutamic acid had the highest level (15.74%DM), where as others were ranged between 2.7 to 7.6% DM. (Animal Production 7(1): 46-51 (2005)
Analysis of Fatigue and Fracture of Hot Mix Asphalt Mixtures
Mohammad Jamal Khattak,Gilbert Y. Baladi
ISRN Civil Engineering , 2013, DOI: 10.1155/2013/901652
Abstract: An accurate assessment of the fatigue life of hot mix asphalt (HMA) mixtures depends on the criteria used in the fatigue analysis. In the past, various studies have been conducted on crack initiation and crack propagation of the HMA mixtures. Most of these studies were focused on the beam samples with or without a sawed crack at the bottom. This paper presents and discusses two different fatigue life criteria for two-dimensional problems represented by cylindrical samples. One criterion is based on the rate of accumulation of the tensile horizontal plastic deformation (HPD) as a function of the number of load repetitions. The second criterion is based on fracture mechanics, stress intensity factor, and the rate of crack growth with respect to the number of load repetitions. It was found that, because of three-dimensional nature of the crack growth in cylindrical samples, the Paris' law was violated. It is shown that the rate of crack growth criterion provides higher values of fatigue life relative to the rate of accumulation of HPD criterion. Although a trend could be established among the fatigue lives obtained by using the two criteria, it was found that the fatigue lives obtained from the rate of accumulation of HPD were consistent and based on the actual measurement of HPD for HMA mixtures. 1. Introduction The prediction of fatigue life of hot mix asphalt mixtures (HMA) is an important aspect of pavement design. Fatigue cracks are caused by repeated traffic loading and are typically initiated at the bottom of the HMA layer where the tensile stress and strain are the highest. With increasing number of load application, the cracks propagate to the surface where they appear as one or more longitudinal cracks, which will be connected by transverse cracking to form a pattern similar to an alligator hide. Many factors affect the fatigue life of HMA pavement such as the tensile strength of the asphalt binder, traffic load, construction practices, aggregate angularity and gradation, relative stiffness of the AC, and the base material and environmental conditions such as temperature and moisture. In the past, many efforts have been made to estimate the fatigue life of laboratory compacted HMA mixtures. Such estimates are highly dependent on the criterion used. Hence, various criteria were developed and are reported in the literature [1–12]. Monismith and Deacon (1969) [6] and Pell and Cooper (1975) [7] conducted displacement-controlled trapezoidal fatigue test and proposed that for HMA mixtures the fatigue failure of the mixture is reached when the load
Adaptive Backstepping Voltage Controller Design for an PWM AC-DC Converter
A. Allag,M.Y. Hammoudi,S.M. Mimoune,M.Y. Ayad
International Journal of Electrical and Power Engineering , 2012,
Abstract: This study presents a new control strategy for a three phase PWM converter, which consists of applying an adaptive backstepping control. The input-output feedback linearisation approach is based on the exact cancellation of the nonlinearity, for this reason, this technique is not efficient, because system parameters can vary. The nonlinear adaptive backstepping control can compensate the nonlinearities in the nominal system and the uncertainties. Simulation results are obtained using Matlab/Simulink. These results show how the adaptive back-stepping law updates the system parameters and provide an efficient control design both for tracking and regulation.
Page 1 /51515
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.