Papers by Muhammad Omer Farooq Khan
African Journal of Clinical and Experimental Microbiology, 2010
Hepatitis C virus (HCV) is a major cause of chronic liver disease resulting in cirrhosis and hepa... more Hepatitis C virus (HCV) is a major cause of chronic liver disease resulting in cirrhosis and hepatocarcinoma. It is believed to be widespread in Africa but its epidemiology is incomplete and is yet to be determined in many areas of the sub-saharan Africa including Nigeria. Using third generation enzyme immuno-assay (EIA-3) and recombinant immunoblot assay (RIBA) technique as confirmatory test, we examined the prevalence of HCV antibodies in 226 blood donors and 226 patients attending Aminu Kano Teaching Hospital (AKTH) in Kano, Nigeria and evaluated the risk factors of HCV transmission in this environment. HCV antibodies were detected in 0.4% and 2.2% blood donors and patients respectively. The overall HCV seroprevalence was 1.3%. There was increased infection acquisition with increasing age; one (16.7%) HCV infection occurred in 25-34 years age group and 5 or 83.3% in subjects > 45 years in age which was significant (P< 0.05). The ratio of infection in male to female was 1:5. Evidence of previous exposure via transfusion was common in HCV seropositive subjects and could be a major risk factor of acquisition in this environment. Adequate screening of blood products in sub-Saharan Africa (Nigeria inclusive) may minimize the risk of HCV transmission and associated health complications.
The Thai Journal of Veterinary Medicine
The objective of the present investigation was to ascertain the prevalence of antibiotic resistan... more The objective of the present investigation was to ascertain the prevalence of antibiotic resistance amongst E. coli strains obtained from broiler chicken in two different poultry farms against antibiotics that have a limited or no use in poultry and to advocate a probable mechanism of antibiotic resistance transfer between strains. A high resistance rate was seen against azteronam (100%), streptomycin (88-92%) followed by amoxicillin (68-76%), ceftrioxone (60-68%) and cefepime (56-68%). However reasonably lower levels of resistance were seen towards coamoxiclave (40%), ciprofloxacin (24-28%), and ofloxacin (36-40%). Meropenem emerged as least resistant (16-28%) antimicrobial agent. Likewise, virtually entire sum of isolates were reported as resistant to not less than three antibiotics (multidrug resistant). It was noticed that above half of the isolates tested were capable of conjugative R plasmid transfer between strains. We finally concluded that there existed a significant evidence of multidrug resistance in E. coli isolates obtained from two poultry farms, capable of conjugative transfer of resistance between isolates and probably to animals and human.
Background: Methicillin resistant Staphylococcus aureus (MRSA) is a common pathogen which has inc... more Background: Methicillin resistant Staphylococcus aureus (MRSA) is a common pathogen which has increased both morbidity and mortality in hospitals and out-door patients.<br> Objective: Aim of our study is to measure prevalence of MRSA in in-door patients and out- door patients, as well as its sensitivity against gentamycin, vancomycin and ciprofloxacin. Methods: A sample of 194 S. aureus was taken retrospectively from Pathology lab of a tertiary care hospital. MRSA was identified and further subjected against gentamycin, vancomycin and ciprofloxacin. Result: 65.9% of S. aureus isolates were MRSA. 22.7%, 35.7%, 99.1% of MRSA were susceptible to ciprofloxacin, gentamycin and vancomycin, respectively. 75.8% MRSA was from pus samples. 66% MRSA was from in-door patient department (IPD).<br> Conclusion: MRSA was more prevalent in IPD. MRSA prevalence is escalating. Vancomycin is losing its effectiveness against MRSA as one resistant case was found. Inappropriate use and unprofe...
WSEAS TRANSACTIONS on SYSTEMS archive, Feb 1, 2009
This paper presents a new control scheme for dynamic voltage restorer (DVR), which consists of a ... more This paper presents a new control scheme for dynamic voltage restorer (DVR), which consists of a set of series and shunt converters connected back-to-back (BTB), three series transformers, and a dc capacitor installed on the common dc-link. The DVR is characterized by installing the shunt converter on the source side and the series converter on the load side. A decoupled multiple reference frame phase-locked-loop (DMRF-PLL) is proposed, which decouples signals of different frequencies and eliminates interactions between the fundamental-frequency positive-sequence components and harmonic and/or negative-sequence components in the grid voltages. The proposed DMRF-PLL scheme achieves a fast, precise, and robust positive-sequence voltage detection even under unbalanced and/or distorted grid voltages conditions. A detailed description and derivation of the detection method is presented. Besides, a separate proportional-integral (PI) controller is adopted to regulate the dc-link capacitor voltage. The load voltage waveform is restored to be sinusoidal with fundamental frequency by dynamically injecting compensating voltages to the series brunch of converters. The validity and effectiveness of the presented scheme has been confirmed by extensive simulation results obtained from a 380V/50kVA system using Matlab/Simulink.
Energies, 2019
The modular multilevel converter (MMC) has been prominently used in medium- and high-power applic... more The modular multilevel converter (MMC) has been prominently used in medium- and high-power applications. This paper presents the control of output and circulating current of MMC using sliding mode control (SMC). The design of the proposed controller and the relation between control parameters and validity condition are based on the system dynamics. The proposed designed controller enables the system to track its reference values. The controller is designed to control both output current and circulating current along with suppression of second harmonics contents in circulating current. Furthermore, the capacitor voltage and energy of the converter are also regulated. The control of output current is carried out in dq-axis as well as in αβ-axis with first-order switching law. However, a second-order switching law-based super twisting algorithm is used for controlling circulating current and suppression of its second harmonics contents. The stability of the controlled system is numeric...
In cryptanalysis, security of ciphers visa -vis attacks is gauged against three criteria of compl... more In cryptanalysis, security of ciphers visa -vis attacks is gauged against three criteria of complexities, i.e., computations, memory and time. Some features may not be so apparent in a particular domain, and their analysis in a transformed domain often reveals interesting patterns. Moreover, the complexity criteria in different domains are different and performance improvements are often achieved by transforming the problem in an alternate domain. Owing to the results of coding theory and signal processing, Discrete Fourier Transform (DFT) based attacks have proven to be efficient than algebraic attacks in terms of their computational complexity. Motivated by DFT based attacks, we present a transformed domain analysis of Linear Feedback Shift Register(LFSR) based sequence generators. The time and frequency domain behavior of nonlinear filter and combiner generators is discussed along with some novel observations based on the Chinese Remainder Theorem (CRT). CRT is exploited to establish patterns in LFSR sequences and underlying cyclic structures of finite fields. Application of DFT spectra attacks on combiner generators is also demonstrated. Our proposed method saves on the last stage computations of selective DFT attacks for combiner generators. The proposed approach is demonstrated on some examples of combiner generators and is scalable to general configuration of combiner generators.
Much research has been conducted in the field of conflict management and its impact on the negati... more Much research has been conducted in the field of conflict management and its impact on the negative and positive consequences but little research has taken place in the Higher Education Institutions (HEIs). The main purpose of this paper was to know the impact of some variables on the positive and negative consequences of conflict in the Higher Education Institutions (HEIs) of Khyber Pakhtunkhwa (KP), Pakistan. Survey method was used and data was obtained from two public and two private sector universities through questionnaire. Results show that Integrating and obliging strategies increased the positive consequences while dominating and avoiding strategies were found to increase the negative consequences. Similarly, structural issues and limited resources were found to invite negative consequences of conflict in the HEIs of KP. Interpersonal conflict had also significant negative impact on the consequences. Hence, conflict itself is not harmful but other variables make it harmful a...
Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 2015
The accuracy of the Content should not be relied upon and should be independently verified with p... more The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.
SSRN Electronic Journal, 2010
This study investigates the relationship between organizational commitment and employees' job per... more This study investigates the relationship between organizational commitment and employees' job performance in Meli Bank in Kurdistan Iran. The results revealed a positive relationship between organizational commitment and employees' job performance. In the comparative analysis of three dimensions of organizational commitment, normative commitment has a positive and significant correlation with employees' job performance. Furthermore, the study explores the employees job performance with four demographic variables, resulting that male employees are high performer vis-à-vis their female counterparts. The implications and limitations are also discussed at the end of the paper.
Journal of Ayub Medical College, Abbottabad : JAMC
The rational drug prescribing practice is an important health concern around the globe that not o... more The rational drug prescribing practice is an important health concern around the globe that not only interferes patient's life but also the socioeconomic issues. The aim of current study was to evaluate the rational use of drug, prescribing behaviour of consultant physicians, role of medical team members in irrational therapy and form the basis for providing necessary information to the policy makers. This cross-sectional study was conducted involving a set of 340 medication orders containing about 1,755 medications prescribed to patients in DHQ Teaching Hospital DI Khan, Pakistan from March to July 2009. The WHO operational package for monitoring and assessing country pharmaceutical situations indicators were used for data collection. Among drugs prescribed per average encounter, 75% were dispensed from hospital pharmacy. Generally about 22.3% encounters of overdosing, 16.16% drug duplication, 24.25% drug-drug interactions, 3.5% adverse drug effects and 3.8% cases of contraindi...
Field experiment was conducted to study the effect of wastewater irrigation and different organic... more Field experiment was conducted to study the effect of wastewater irrigation and different organic and inorganic amendments on the phytoavailability of metals to wheat crop. Wheat was grown in (2x1 m plot) irrigated with wastewater generated from HIE (Hayatabad Industrial Estate, Peshawar, Pakistan) and municipal wastes during 2008. Five different amendments viz farm yard manure (FYM), poultry manure (PM), diammonium phosphate (DAP), triple super phosphate (TSP) and humic acid (HA) were applied and mixed with soil prior to crop growing. In addition, a control (Tubewell irrigation TW) and only wastewater (WW) irrigation plot (without amendments) was also set up for comparison. The FYM and PM were applied at the rate of 10 tons ha-1. The DAP and TSP were added @ of 150 kg ha-1 as P where as HA was added @ of 1.5 kg ha-1. A Basal dose of N and K @ of 120 and 60 kg respectively were also added to all experimental plots except control. The results showed that wheat yield and yield components were significantly increased with the addition of all the amendments compared to control and the higher increase was noted in HA treated plots. The effect of different amendments applied on AB-DTPA extractable metals was significant for Cu, Fe, Mn, Ni and Pb (P<0.05) and non significant for Cd, Cr and Zn. Higher concentration were noted in the wastewater applied plots with exception of Zn that was lowest in wastewater irrigated plots. The effect of all the amendments on AB-DTPA extractable metals was comparable with exception of Pb that was significantly reduced by DAP. It was concluded that all the metals under study were below the toxicity level in soil and none of the essential nutrient was deficient. The leaves metal concentrations showed that higher values of all the metal under study were noted in leaves when irrigated with WW and TW irrigated plants resulted minimum accumulation of metals in leaves. The effect of different amendments on the plant uptake of metal was variable. Addition of HA reduced the uptake of Cd, Cr, Mn whereas DAP was effective in reducing the phytoavailability of Pb and Zn.
Jurnal Teknologi, 2014
One dimensional metal oxide semiconductor nanowires of copper (I) oxide (Cu2O), zinc oxide (ZnO),... more One dimensional metal oxide semiconductor nanowires of copper (I) oxide (Cu2O), zinc oxide (ZnO), and their heterojunction nanowires possess remarkable physical and chemical properties. ZnO and Cu2O areattractive because the metals are abundant on earth, inexpensive, nontoxic.Moreover, these oxides have useful optical and electrical properties suitable for a wide variety of electrical devices, because their electrical conduction can be predictably controlled by doping. We here restrict the disscussion using a Hot Tube Vacuum Thermal Evaporation. The NWs in these devices will be studied by physical vapor deposition known as vapor-liquid-solid (VLS). Therefore, we explore conventional methods, particularly the VLS of growing ZnO and Cu2O nanowires which are assisted by the catalyst. In this short review, we report the individual and combined (Cu2O/ZnO) junction nanowires by PVD method. The main advantages of these composite nanowires are the natural p-n characteristics, the broad li...
IOSR Journal of Electronics and Communication Engineering, 2014
In this paper, a different Double Negative (DNG) metamaterial is demonstrated to upgrade the perf... more In this paper, a different Double Negative (DNG) metamaterial is demonstrated to upgrade the performance of Microstrip Patch Antenna (MPA). The scattering parameters are utilized to plan and corroborate the DNG structure. The proposed DNG is then employed as a superstrate of MPA which reduces the surface waves and edge diffracted waves of an antenna and therefore reduces its losses. To analyze the performance a conventional MPA without DNG is also simulated. The outcomes indicate that DNG based MPA has enhanced performance as far as directivity, gain and radiation efficiency of antenna. The directivity is improved from 6.878dBi to 7.184dBi. The effectiveness of an antenna is increased from 72% to 80.42%. Gain of antenna is also enhanced from 5.454dB to 6.237dB. The proposed circular SRR based DNG MPA could be a great competitor for application in wireless communication.
2014 IEEE 28th International Conference on Advanced Information Networking and Applications, 2014
Wireless community networks are a successful example of a collective where communities operate IC... more Wireless community networks are a successful example of a collective where communities operate ICT infrastructure and provide IP connectivity based on the principle of reciprocal resource sharing of network bandwidth. This sharing, however, has not extended to computing and storage resources, resulting in very few applications and services which are currently deployed within community networks. Cloud computing, as in today's Internet, has made it common to consume resources provided by public clouds providers, but such cloud infrastructures have not materialized within community networks. We analyse in this paper socio-technical characteristics of community networks in order to derive scenarios for community clouds. Based on an architecture for such a community cloud, we implement a prototype for the incentive-driven resource assignment component, deploy it in a testbed of community network nodes, and evaluate its behaviour experimentally. Our evaluation gives insight into how the deployed prototype components regulate the consumption of cloud resources taking into account the users' contributions, and how this regulation affects the system usage. Our results suggest a further integration of this regulation component into current cloud management platforms in order to open them up for the operation of an ecosystem of community cloud.
Advanced Computational Techniques in Electromagnetics, 2014
The scope of this paper is to design and simulate a novel structure having simultaneous negative ... more The scope of this paper is to design and simulate a novel structure having simultaneous negative permittivity and permeability so called double negative metamaterial or left handed material. The DNG structure consists of five rectangular split ring resonators on one side of dielectric medium and a couple of wires on other side. The complex permittivity, permeability and refractive index are determined from simulated Scattering parameters using direct retrieval method. Simulations of DNG structure are carried out using CST MWS. MATLAB is used for verification of negative values of structure's parameter.
SSRN Electronic Journal, 2008
This study explores the relationship between work rewards and job satisfaction with moderating ef... more This study explores the relationship between work rewards and job satisfaction with moderating effect of age differences. It is an empirical study and a sample of 84 full time employees of FESCO (Faisalabad Electric Supply Company, Pakistan) was taken. The results of this study reveal that job rewards are proved to be strong determinant of job satisfaction. Job satisfaction is more related to extrinsic rewards for employees than intrinsic rewards. The age differences have moderating effect on job satisfaction as it increases with rise in age.
Journal of Chemistry, 2013
Essential and nonessential heavy metals like iron (Fe), nickel (Ni), manganese (Mn), zinc (Zn), c... more Essential and nonessential heavy metals like iron (Fe), nickel (Ni), manganese (Mn), zinc (Zn), copper (Cu), cadmium (Cd), chromium (Cr), and lead (Pb) were analyzed in four selected medicinal plants such asCapparis spinosa, Peganum harmala, Rhazya stricta,andTamarix articulataby flame atomic absorption spectrophotometer (FAAS). These medicinal plants are extensively used as traditional medicine for treatment of various ailments by local physicians in the area from where these plants were collected. The concentration level of heavy metals in the selected plants was found in the decreasing order as Fe > Zn > Mn > Cu > Ni > Cr > Cd > Pb. The results revealed that the selected medicinal plants accumulate these elements at different concentrations. Monitoring such medicinal plants for heavy metals concentration is of great importance for physicians, health planners, health care professionals, and policymakers in protecting the public from the adverse effects of thes...
Soil Science and Plant Nutrition, 1999
The use of the GUS reporter gene was found to be very suitable for studying the competitiveness o... more The use of the GUS reporter gene was found to be very suitable for studying the competitiveness of the Rhizobium strain NGR234 and Bradyrhizobium strain CP283 for nodulation in siratro. However, the expression from the transposon mTn5SSgusA20 declined in the nodules of old plants, particularly the nodules at 35 d after inoculation and onward. Siratro inoculated with both gusA-marked NGR234 and CP283 strains showed a similar nodulation and acetylene reduction activity (ARA) to those of their parental strains. No major changes in nodulation and symbiotic properties in these marked strains were observed. When the Rhizobium strain NGR234 and Bradyrhizobium strain CP283 were inoculated separately to siratro, both of them were found equally effective for nodulation in the plant. But when the Rhizobium strain NGR234, and gusAmarked Bradyrhizobium strain CP283 were co-inoculated to the plants in a ratio of 1:1, the strain NGR234 occupied 75% of the nodules, while, the strain CP283 occupied only 25%, irrespective of the growth stages and inoculum concentrations. Similar results were also observed in the plants in which the Bradyrhizobium strain CP283 and gusA-marked Rhizobium strain NGR234 had been co-inoculated. Thus, the Rhizobium strain NGR234 was more competitive for nodulation in siratro.
Polymer Engineering & Science, 1990
This paper describes the shear imposed interfacial segregation of release systems for the facilit... more This paper describes the shear imposed interfacial segregation of release systems for the facilitated attenuation of polyurethane (PU) adhesion to metal coun‐terfaces using a RI‐RIM system. It is shown that the migration rate of the dispersed release additives due to a shear imposed stress in the resin fluid is much greater than that arising from Fickian diffusion, thereby removing a vital constraint from conventional practice. The novel rotary injection RIM system is presented to simulate the on‐line injection and shear induced interfacial segregation in model PU/abherent systems. A wide range of recipes comprising single (liquids or solids) and multicomponent (liquid‐liquid and solid‐liquid) release materials were injected into the polymerizing resin mixture to provide cohesively weak and friable “particle” boundary layer assemblies at the PU/metal interface. An instrumented Blister Test was employed to evaluate the quality of the molded interfaces in terms of adhesion and the con...
Acta Polytechnica Hungarica, 2010
1Department of Power Electronics, School of Mechatronics Engineering, University of Electronic Sc... more 1Department of Power Electronics, School of Mechatronics Engineering, University of Electronic Science and Technology of China, No.2006 XiYuan Road, West Park of Chengdu Hi-Tech Zone, 611731 Chengdu, PR China 2Department of Electrical Engineering, XuHui ...
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Papers by Muhammad Omer Farooq Khan