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Ali Saqib,Haq Muhammad Abdul,Naz Shahina,Faheem Akbar Muhammad 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.2
The efficiency of pesticides is greatly affected by their ability to adhere and retain on foliage surface. Neem oil, though a very well-known source of many biologically active pesticidal compounds, is very sensitive to envi ronmental parameters, such as UV light. Also, due to volatilization, it is lost in environment and hence fail to reach target and show activity. In this study we attempted to stabilize neem oil emulsion and increase its retention on foliage surface by adding varying concentration of gum cordia. Gum cordia is an anionic poly saccharide derived from Cordia myxa fruits with strong adhesion and emulsification properties. The lethal concentration (LC 50 ) of the final formulations were also determined against aphid species Myzus persicae and Schizaphis graminum. Adhesion was found to be dependent on the concentration of gum cordia as well as type of crop. Increasing gum cordia in neem oil formulations resulted in increase in adhesion of the spray on the leaf surfaces and up to 6 times higher adhesion was observed with 0.5% gum cordia on mustard leaf compared to control. The LC 50 decreased with increasing gum cordia concentration. The LC 50 values of neem oil sprayed on mustard, spinach, and wheat leaves with 0.5% gum cordia were 0.205, 0.715, and 2.074% respectively while for neem oil control spray (with no gum cordia) LC 50 values were 1.833, 2.112, and 4.992% respectively for the above tested leaves. Presence of greater than 0.125% gum cordia in neem formulations provided the barrier against UV irradiation.
Regulated Peak Power Tracking (RPPT) System Using Parallel Converter Topologies
Muhammad Saqib Ali,Hyun-Su Bae,Seong-Jun Lee,Bo-Hyung Cho 전력전자학회 2011 JOURNAL OF POWER ELECTRONICS Vol.11 No.6
Regulated peak power tracking (RPPT) systems such as the series structure and the series-parallel structures are commonly used in satellite space power systems. However, these structures process the solar array power or the battery power to the load through two cascaded regulators during one orbit cycle, which reduces the energy transfer efficiency. Also the battery charging time is increased due to placement of converter between the battery and the solar array. In this paper a parallel structure has been proposed which can improve the energy transfer efficiency and the battery charging time for satellite space power RPPT systems. An analogue controller is used to control all of the required functions, such as load voltage regulation and solar array stabilization with maximum power point tracking (MPPT). In order to compare the system efficiency and the battery charging efficiency of the proposed structure with those of a series (conventional) structure and a simplified series-parallel structure, simulations are performed and the results are analyzed using a loss analysis model. The proposed structure charges the battery more quickly when compared to the other two structures. Also the efficiency of the proposed structure has been improved under different modes of solar array operation when compared with the other two structures. To verify the system, experiments are carried out under different modes of solar array operation, including PPT charge, battery discharge, and eclipse and trickle charge.
Accessibility and Performance Evaluation of E-Services in Oman Using Web Diagnostic Tools
Taiseera AlBalushi,Saqib Ali,Rafi Ashrafi,Shahid AlBalushi 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.7
With the advancements in technology, there is a paradigm shift in the outlook, usage, provision, and access of e-services. This has led to increased availability of services through electronic media as e-services, e-government services, e-businesses, e-commerce, and many more. It is imperative to ascertain the quality of such services regularly against internationally accepted guidelines, standards, and tools to verify whether it is satisfying, increasing user expectations and technological advancements. This research investigates the current status of the quality of e-services in Oman by considering key quality dimensions that affect the services in the country using web diagnostic tools. The study not only benchmarks against international standards but also gives an insight into any meager aspects of quality of e-service in Oman. The study concluded that selected e-services in Oman performed at adequate or superior levels in some metrics; however, they fell short in a few metrics.
Shahid, Khadija,Shahzadi, Saira,Ali, Saqib,Mazhar, M. Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.1
New organotin(IV) derivatives with general formulae R_2SnL_2 and R_3SnL, where R = methyl, n-butyl, n-octyl and phenyl and HL is either 3-[N-(4-nitrophenyl)amido]-propenoic acid or 3-[N-(4-nitrophenyl)amido] propanoic acid have been synthesized in 1 : 2 and 1 : 1 molar ratio by different methods. The FTIR spectra clearly demonstrated that the organotin(IV) moieties react with [O,O] atoms of the ligands. The bonding and coordination behavior in these complexes are discussed on the basis of multinuclear (^1H,\,^{13}C,\,^{119}Sn) NMR and mass spectrometric studies. Antibacterial, and antifungal screening tests were performed for these compounds and reported here. These values were compared to those of the precursors and it was found that diorganotin(IV) complexes exhibit less activity as compared to triorganotin(IV) complexes . LD_{50} data were obtained by Brine Shrimp assay method. Insecticidal activity was performed for selective compounds by contact toxicity method.