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Search Results: 1 - 10 of 461457 matches for " A. Jabbar "
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A. Jabbar
Pakistan Veterinary Journal , 2005,
Abstract: No Abstract
Studying the effect of Building Block Shape on Sierpinski tetrahedron fractal antenna behavior using FDTD-equivalent electric circuits
Jabbar, A. N.;
Journal of Microwaves, Optoelectronics and Electromagnetic Applications , 2012, DOI: 10.1590/S2179-10742012000100014
Abstract: this research aims to study the effect of the modification in the building block shape (bbs) on the frequency response of sierpinski three dimensional pre-fractal antenna using conventional circuit analysis. three different shapes of bbs's are used to build the antenna. the surface current is analyzed and compared for every bbs. a simple model was devised using the nodal analysis to provide an iterative method for calculating the distribution of currents and voltages for the antenna at every node. the antennas parameters such as y-parameter, input return loss (irl), delivered power and surface current are investigated at the first and third tuning frequencies to enhance the perspective of the bbs effect.
On locally Artinian modules
A. K. Jabbar
International Journal of Algebra , 2012,
Jabbar,A 周世平
红外与毫米波学报 , 1992,
Abstract: 根据测得的表面电阻R_S(T),通过在BCS理论框架中引入一个修正电导率,计算出YBa_2Cu_3O_(7-δ)(YBCO)超导材料的磁穿透深度和简约能隙与温度的相关性.引入修正电导率主要是根据YBCO超导体中电子结构表示Cu-O链对微波表面电阻的贡献.计算得到的磁穿透深度和相对能隙与实验结果符合得相当好.
Design and Fabrication of Nanostructures Silicon Photodiode
Alwan M. Alwan,Allaa A.Jabbar
Modern Applied Science , 2011, DOI: 10.5539/mas.v5n1p106
Abstract: A highly sensitive (metal/nanostructure silicon /metal) photodiode has been fabricated from rapid thermal oxidation (RTO) and rapid thermal annealing (RTA) processes,Of nanostructures porous silicon prepared by laser assisted etching . Photoresponse was investigated in the wavelength rang of (400-850nm) . A responsivity of (3A/w) was measured at (450 nm) with low value of dark current of about ( 1 μA /cm2 ) at 5 volt reverse bias.
Some finiteness properties of generalized graded local cohomology modules
I. Akray,A. K. Jabbar,R. Sazeedeh
International Journal of Algebra , 2012,
Limnological study of Dokan, Derbendikhan and Duhok lakes, Kurdistan region of Iraq  [PDF]
Janan Jabbar Toma
Open Journal of Ecology (OJE) , 2013, DOI: 10.4236/oje.2013.31003

The present study deals with the assessment of physico-chemical characteristics of Dokan, Derbendikhan and Duhok lakes. The physico-chemical characteristics of these lakes have been studied and analyzed for a year, during January-April-July and October 2009. Seasonal variations of two sampling sites of the lakes have been observed. Various parameters including air temperature, water temperature, electrical conductivity, TDS, pH, total alkalinity, total hardness, dissolved oxygen, calcium, magnesium, sodium, potassium, sulfate, chloride, nitrite and phosphate have been analyzed. The study has revealed that there are significant seasonal variations in some physico-chemical parameters and as a whole most of the parameters are different in the three lakes.

Antimicrobial and Cytotoxic Activity of the Alkaloids of Amlaki (Emblica officinalis)
S. Rahman,M.M. Akbor,A. Howlader,A. Jabbar
Pakistan Journal of Biological Sciences , 2009,
Abstract: Alkaloids are important sources of drug that’s why we have conducted our research to find out the biological activity of the alkaloids of a plant that is the Amlaki. Alkaloids were extracted from the methanolic extract of the fresh ripe fruits of Amlaki (Emblica officinalis) through solvent-solvent partitioning method with n-hexane and chloroform. The chloroform soluble fraction of the crude methanolic extract of the ripe fruits of Amlaki containing alkaloids was subjected to antimicrobial activity and brine shrimp lethality bioassay for observing cytotoxic activity. The chloroform soluble fraction of the methanolic extract exhibited significant antimicrobial activity against some Gram positive and Gram negative pathogenic bacteria and strong cytotoxicity having a LC50 of 10.257±0.770 μg mL-1. It is concluded that the chloroform soluble fraction of the ripe fruits of Amlaki containing alkaloids are biologically active.
Standardization of Medium for the Production of Maximum Phytotoxic Activity by Fusarium oxysporum f. sp. ciceris
Iftikhar A. Khan,S.S. Alam,A. Jabbar
Pakistan Journal of Biological Sciences , 2001,
Abstract: Five liquid media were studied for the production of dry weight spores of Fusarium oxysporum f. sp. ciceris and pH/ phytotoxicity of the culture filtrates after each 7 days incubation up to 28 days. Maximum increase in pH was observed in minimal medium (MM) at 21 days. The media potato dextrose broth (PDB) and minimal medium containing chickpea root extract (MM+) were found suitable for sporulation of the fungus, while maximum dry weight of the fungus was obtained in PDB medium. Phytotoxicity assay of these culture filtrates revealed that the maximum activity was produced in PDB medium, while ethyl acetate phases of the culture filtrates from Czapek dox (CZ) medium and minimal medium (MM) showed maximum phytotoxic activity.
Biochemical Effects of Phytotoxins on Chickpea and its Possible Role in Wilt Disease
Iftikhar A. Khan,S.S. Alam,A. Jabbar
Pakistan Journal of Biological Sciences , 2001,
Abstract: Fusarium oxysporum f. sp. ciceris and its phytotoxins induced the leakage of electrolytes from chickpea leaflets. A direct correlation was found between the conductivity of the leaching solution and susceptibility to chickpea wilt. The resistant varieties (CM88 and ILC-3279) released lesser amount of electrolytes as compared to the susceptible varieties (Aug-424 and ILC-1929). The losses of most of the electrolytes such as phosphates, total phenols, protein, carbohydrates, K+ and Ca+2 were significantly higher in toxin treated tissues than in control of both the cultivars. There was a little effect of toxin on leakage of Na+ ion in resistant or in susceptible cultivars. The susceptible cultivars released higher amount of phosphates, carbohydrates, and K+/Ca+2 ions from toxin treated tissues than the resistant cultivars.
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