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- 저자 : Shah Muhammad Zahir (검색결과 3 건)
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Laser Polarization Effects on the Photodetachment Cross Section of H− Near a Reflecting Surface
Suneela Arif,Muhammad Haneef,Jehan Akbar,Saleh Mohammad,Imran Ullah,Hameed Khan,Nasrullah Shah,Muhammad Zahir,Abdur Rab 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.5
The influence of laser polarization angle on the photodetachment of H<sup>−</sup> near a reflecting surface is investigated based on a theoretical imaging technique. An analytical expression for the photodetachment cross section is derived. The photodetachment cross section of H<sup>−</sup> near a reflecting surface is found to be not only related to the inter-ion-surface distance and the photon energy but also the laser polarization angle <i>θ<sub>L</sub></i>. A strong oscillating structure is noted for <i>θ<sub>L</sub></i> = 0°. As the angle continues to increase, the oscillating structure diminishes, and for <i>θ<sub>L</sub></i> = 90°, the oscillating structure in the cross section reduces to a non-oscillating structure.
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Rasheed Syed Basit,Shah Muhammad Zahir 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
Cutaneous Leishmaniasis is endemic in tribal district Khyber for last more than one decade. The causative agent Leishmania tropica is known but sand fly species responsible for the transmission of disease still needs to be investigated. A total of 2647 Phlebotomus females belonging to 11 species were divided into 435 batches and subjected to PCR for detection of Leishmania in sand flies. A total of 50 batches belonging to three species i.e. Phlebotomus Phlebotomus sergenti, Phlebotomus papatasi and Phlebotomus alexandri were detected positive for Leishmania tropica. Overall minimum infection rate was 1.89% (50/2647). Highest minimum infection rate of 2.11% (39/ 1710) was observed for Phlebotomus sergenti followed by 1.21% (8/661) for Phlebotomus paptasi and 1.82% (3/ 165) for Phlebotomus alexandri. Both blood fed (38%) and unfed (62%) sand flies were detected positive for the parasite DNA. Positive specimens were collected throughout the active season, from all collection sites of the study area. Detection of Leishmania parasite in multiple species of Phlebotomus indicates the possible role of these species as vector of disease in the tribal district Khyber of Pakistan. It also indicates the probable complex transmission cycle of the disease involving multiple vector species in the study area. Devising a control strategy by focusing on these vector species, may reduce the disease burden in the cutaneous leishmaniasis endemic tribal district Khyber.
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Dawar Abdullah,Wakif Abderrahim,Saeed Anwar,Shah Zahir,Muhammad Taseer,Kumam Poom 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.2
Motivated by the temporal relaxation feature of the Jeffrey model and its practical uses in the rheological modeling of several vital liquids, this study aimed to present a theoretical analysis of three-dimensional MHD Jeffrey nanofluid flows over a dual stretching surface with velocity slip conditions. By adopting the nonhomogeneous nanofluid model along with the passive control approach of nanoparticles, the current flow problem is solved semi-analytically via the homotopy analysis method for convective heating and multiple slip conditions. Dynamically, the magnetic and viscoelastic parameters have a declining effect on the velocity distributions in both directions in the existence and absence of slip effects, while the Deborah number has generally an escalating influence on the flow distributions. On the other hand, the variations of the velocity profiles in both directions are always greater in the presence of slip effect as compared to the nonslip case. Besides, the velocity stretching factor rises the velocity profiles in both directions. Furthermore, this increasing impact is dominant for the velocity distribution along the $y{\rm{-}}$direction as compared to the velocity field along the $x{\rm{-}}$direction. Thermally, the greater Biot number increases the temperature distribution. However, the bigger Schmidt number reduces the concentration distribution.
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