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Search Results: 1 - 10 of 1160 matches for " Amjad Imran "
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On the Effects of Complex Conjugate Medium on TM Scattering by a Strip  [PDF]
Amjad Imran, Ahsan Illahi
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.37043
Abstract: In this paper, Method of Kobayashi Potential is used to determine the scattering behavior of a strip which is placed at the air-complex conjugate medium interface. And discussion is presented that how the complex conjugate medium mod-ify the scattering properties of the strip. A comparison is also given with that if we replace the conjugate medium with standard dielectric medium. E-polarized electromagnetic plane wave is supposed to be obliquely incident upon the ge-ometry. Scattered fields in both the half spaces are supposed in terms of unknown weighting functions. Discontinuous properties of Weber-Schafheitlin integral and orthogonal properties of Jacobi’s polynomials are used to determine these unknown weighting functions. Far scattered fields have been calculated using Saddle Point Method and computed for different parameters of interest.
Diffraction of Plane Wave by Two Parallel Slits in an Infinitely Long Impedance Plane Using the Method of Kobayashi Potential
Amjad Imran;Qaisar Abbas Naqvi;Kohei Hongo
PIER , 2006, DOI: 10.2528/PIER06042601
Abstract: We studied the diffraction of E-polarized electromagnetic plane wave by two parallel slits in an infinitely long impedance plane. Analysis is based on the concept of Kobayashi potential. Imposition of required boundary conditions leads to dual integral equations. The dual integral equations can be reduced to matrix equations with the infinite unknowns by using the properties of Weber-Schafheitlin's discontinuous integrals and Jacobi's polynomials. Matrix elements are given in terms of indefinite integrals which are difficult to evaluate analytically. The matrix elements are solved numerically. Diffracted far fields in the upper half space are studied.
Diffraction of Electromagnetic Plane Wave by an Impedance Strip
Amjad Imran;Qaisar Abbas Naqvi;Kohei Hongo
PIER , 2007, DOI: 10.2528/PIER07053104
Abstract: This paper investigates the scattering of electromagnetic plane wave from an impedance strip. Both E- and H-polarizations are considered. The method of analysis is Kobayashi potential, which uses the discontinuous properties of Weber-Schafheitlin's integrals. Imposition of boundary conditions result in dual integral equations. Using the projection, equations reduces to matrix equations. The elements are given in terms of infinite integrals that contains the poles for particular values of surface impedance and these integrals are computed numerically. Far diffracted fields in the upper half space for different angles of incident are computed. To check the validity of the results, we have derived the physical optics (PO) approximate solutions. Numerical results for both the methods are compared. The agreement is good. Current distribution on the strip is also presented.
Diffraction of Electromagnetic Plane Wave from a Slit in PEMC Plane
Amjad Imran;Qaisar Abbas Naqvi;Kohei Hongo
PIER M , 2009, DOI: 10.2528/PIERM09042207
Abstract: In the present investigation, diffraction from a slit in perfectly electromagnetic conducting (PEMC) plane has been studied. Both the E- and H-polarization are considered and the method of analysis is Kobayashi Potential (KP). The mathematical formulation involves dual integral equations (DIEs). These DIEs are solved by using the discontinuous properties of Weber-Schafheitlin's integral. The resulting expressions, finally, reduce to matrix equations. These are then used to compute the values of unknown expansion coefficients. Numerical results are presented for different parameters of interest especially the dependance of co-polarized and cross-polarized components on the admittance parameter.
Diffraction from a Slit in an Impedance Plane Placed at the Interface of Two Semi-Infinite Half Spaces of Different Media
Amjad Imran;Qaisar Abbas Naqvi;Kohei Hongo
PIER B , 2008, DOI: 10.2528/PIERB08100802
Abstract: Diffraction of an electromagnetic plane wave from a slit in an impedance plane placed at the interface of two different media, has been formulated rigorously. Both the principal polarizations are considered. The method of analysis is Kobayashi Potential (KP). To determine the unknown weighting functions, boundary conditions are imposed which resulted into dual integral equations (DIEs). These DIEs are solved by using the discontinuous properties of Weber- Schafheitlin's integrals. The resulting expressions are then expanded in terms of Jacobi's polynomials. The problems are then, reduced to matrix equations with infinite number of unknowns whose elements are expressed in terms of infinite integrals. These integrals are hard to solve analytically. The integrals contain poles for particular values of surface impedance and are solved numerically. Illustrative computations are given for far diffracted fields and other physical quantities of interest. To check the validity of our work, we compared the far field patterns with those of obtained through Physical Optics (PO). The agreement is good.
Examining the Relationship of Work-Life Conflict and Employee Performance (A Case from NADRA Pakistan)
Amjad Ali Chaudhry,Muhammad Imran Malik,Iqbal Ahmad
International Journal of Business and Management , 2011, DOI: 10.5539/ijbm.v6n10p170
Abstract: With the ever increasing requirements of the work, employees are likely to develop conflict between their work and non-work activities. This paper investigates the relationship of employees’ work-life conflict with their performance. A convenient sample of 103 respondents came from National Database and Registration Authority (NADRA) for the study. The Pearson’s product moment correlation showed no association for the said relationship. An inverse relationship was found working between age of the employees and work-life conflict they experience. Moreover differences of work-life conflict and performance for some demographic variables were measured by applying independent sample t test. The results of the study are compared to the available relevant studies.
A New Function of Human Haptoglobin: Endogenous Inhibition of Prostaglandin Biosynthesis and its Relation to Haemoglobin Binding
Sheikh Arshad Saeed,Sagheer Ahmed,Ali Imran Amjad,Asma Azmatullah
Journal of Medical Sciences , 2003,
Abstract: Human haptoglobin (Hp) is a glycoprotein present in plasma or serum which has the capacity to bind hemoglobin (Hb) specifically and stoichiometrically. Since Hb stimulates prostaglandin (PG) synthase, we investigated the possibility that Hp might affect PG synthesis by combining with Hb. Human Hp was purified by extraction, ammonium sulphate fractionation and DEAE-ion exchange chromatography. The results showed that Hp (50-250 g protein) selectively inhibited in a concentration-related manner, the biosynthesis of PGs via cyclooxygenase pathway. Hp also inhibited lipoxygenase pathway of arachidonic acid metabolism in a concentration related manner. Additional evidence that Hp inhibited PG biosynthesis was obtained by I) the loss of Hp inhibitory activity upon removal of Hp by affinity chromatography on hemoglobin-sepharose from a sample of purified Hp or plasma, ii) inhibiton by Hp of arachidonic acid or bradykinin-induced bronchoconstriction in the guinea-pig and iii) inhibition of arachidonic acid-induced tone of the rat gastric fundus strip. Hb (a known stimulant of cyclooxygenase) reduced the inhibitory effect of Hp in a concentration-related manner, such that all its inhibitory property was lost when it was completely bound by Hb. These findings point to a new function of Hp: endogenous regulation of PG synthesis by combining with Hb release during injury (thus inflammatory processes). Therefore, mammals have dual defence system i.e. a specific immune system and non-specific Hp defence system.
Brain Drain: Post Graduation Migration Intentions and the influencing factors among Medical Graduates from Lahore, Pakistan
Nazish Imran, Zahra Azeem, Imran I Haider, Naeem Amjad, Muhammad R Bhatti
BMC Research Notes , 2011, DOI: 10.1186/1756-0500-4-417
Abstract: A self administered structured questionnaire was developed to collect respondents' demographic and educational characteristics, intention to train abroad, their preferred destination & post training intentions of returning to Pakistan. Various influencing factors which impact on medical graduate's motivation to train abroad or stay in Pakistan were explored using a 10 point scale. SPSS software was used for data entry and analysis.Of the 400 eligible respondents, 275 responded (response rate 68.7%). One hundred and sixty six respondents (60.4%) intended to train abroad either for a specialty (54.9%) or a subspecialty (5.5%) The United States and United Kingdom were the most preferred destination. While 14.2% intended to return to Pakistan immediately after training, a significant percentage (10%) never intended to return to Pakistan or wished to stay abroad temporarily (37%). Professional excellence and establishing quickly in the competitive market were the most important goal to be achieved by the respondents for intention for postgraduate training abroad. The most common reasons cited for training abroad were the impact of residency training on future career (mean score 8.20 ± 2.3), financial conditions of doctors (mean score 7.97 ± 2.37) and job opportunities (mean score7.90 ± 2.34).An alarming percentage of medical graduates from Lahore, Pakistan intend to migrate for post graduate training, mainly to United States. A significant proportion wished to stay in the host country either temporarily or indefinitely. Impact of residency abroad on future career, financial conditions of doctors, job opportunities and better working conditions were some of the motivating factors behind the migration.The increasing migration of international medical graduates from developing countries to more developed countries, a phenomenon known as "brain drain" has continued to fuel the huge inequities in global health. Around 23-28% of doctors working in the four major recipient coun
Privately Held or Publicly Owned? Large Shareholders and Corporate Control  [PDF]
Amjad Toukan
Theoretical Economics Letters (TEL) , 2014, DOI: 10.4236/tel.2014.46051
Abstract:

This paper examines the decision to go public in the presence of large and dispersed shareholders. The decision to go public and the shape of the ownership structure itself depend on the particular combination of concentrated and dispersed ownership that maximizes the initial owners’ wealth. Owners/managers and large shareholders exert costly efforts to increase their share of the value of the public firm. The respective shares and the listing decision are affected by the efficiency of the judiciary and law enforcement system.

Breast Mass and Lytic Bone Lesions: A Rare Presentation of Non-Hodgkin’s Lymphoma Arising in the Breast
Hira Ali,Oladapo Yeku,Daniel Giesler,Ryan Campbell-Massa,Faye Gao,Ali Imran Amjad
Case Reports in Oncological Medicine , 2013, DOI: 10.1155/2013/547171
Abstract: Background. Primary breast lymphoma is a rare malignancy representing less than 1% of all tumors presenting in the breast. Case Presentation. A 55-year-old woman presented with altered mental status due to severe hypercalcemia and was found to have a large breast mass with lytic bone lesions in the calvarium of the skull. Biopsy of the mass revealed diffuse large B-cell lymphoma. Staging workup did not reveal any visceral organ or distant lymph node involvement. The patient’s bone marrow biopsy was positive for involvement with lymphoma. Interestingly, the patient also had a non quantifiable IgA kappa monoclonal protein in the serum. Conclusion. Here, we describe a common presentation in medical oncology, that is, a patient presenting as a clinically advanced breast tumor with hypercalcemia from lytic bone lesions. However, diagnostic workup led to the diagnosis of another common malignancy in an uncommon location, namely, diffuse large B-cell lymphoma arising in the breast. 1. Case Report A 55-year-old Caucasian female with infrequent medical followup and no comorbidities was sent via ambulance to the hospital when coworkers noticed she was confused and not behaving her usual self. On interview, the patient thought she might have been dehydrated and reported recent increase in urinary frequency. She also reported a lump in her left breast which she first noticed six months ago and had been progressively getting larger. Her prior history included a remote retinal tear, and she took no medications. She was an active smoker for 30 years and her family history was negative for breast cancer or any other form of malignancy. Review of systems was positive for some lethargy and intermittent back pain. She denied fever, chills, night sweats, weight loss, headaches, focal weakness, abdominal pain, nausea, vomiting, diarrhea, cough, chest pain, shortness of breath, dysuria, or hematuria. Physical exam was pertinent for a firm, nontender mass in the left breast measuring approximately 15?cm in size with extension into the axillary region. There were no skin changes, nipple discharge, or signs of inflammation. Notably there was no lymphadenopathy or hepatosplenomegaly appreciated. Initial serum chemistries showed multiple metabolic derangements including acute kidney injury (Cr 2.1?mg/dL), profound hypercalcemia (adjusted serum calcium 20.3?mg/dL) and hyperuricemia (uric acid 11.1?mg/dL) (Table 1). CT scan of the head showed no parenchymal abnormalities but revealed multiple lucent calvarial defects consistent with lytic lesions which were also seen on a plain
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