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Search Results: 1 - 10 of 18800 matches for " Ahsan Ali "
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Inflow Outflow Effect and Shock Wave Analysis in a Traffic Flow Simulation  [PDF]
Ahsan Ali, Laek Sazzad Andallah
American Journal of Computational Mathematics (AJCM) , 2016, DOI: 10.4236/ajcm.2016.62007
Abstract: This paper investigates the effect of inflow, outflow and shock waves in a single lane highway traffic flow problem. A constant source term has been introduced to demonstrate the inflow and outflow. The classical Lighthill Whitham and Richards (LWR) model combined with the Greenshields model is used to obtain analytical and numerical solutions. The model is treated as an IBVP and numerical solutions are presented using Lax Friedrichs scheme. Godunov method is also used to present shock wave analysis. The numerical procedures adopted in this investigation yield results which are very much consistent with real life scenario in terms of traffic density and velocity.
New Integral Inequalities through generalized convex functions
Muhammad Muddassar,Ahsan Ali
Mathematics , 2013,
Abstract: In this paper, we establish various inequalities for some mappings that are linked with the illustrious Hermite-Hadamard integral inequality for mappings whose absolute values belong to the class K?;s m;1 and K?;s m;2.
Compromise Allocation for Combined Ratio Estimates of Population Means of a Multivariate Stratified Population Using Double Sampling in Presence of Non-Response  [PDF]
Sana Iftekhar, Qazi Mazhar Ali, Mohammad Jameel Ahsan
Open Journal of Optimization (OJOp) , 2014, DOI: 10.4236/ojop.2014.34007
Abstract: This paper is an attempt to work out a compromise allocation to construct combined ratio estimates under multivariate double sampling design in presence of non-response when the population mean of the auxiliary variable is unknown. The problem has been formulated as a multi-objective integer non-linear programming problem. Two solution procedures are developed using goal programming and fuzzy programming techniques. A numerical example is also worked out to illustrate the computational details. A comparison of the two methods is also carried out.
Modification in Cu-Zn Alloy Properties by 2 MeV Ni+ Ions Irradiation  [PDF]
Shahbaz Ahmad, Shazia Bashir, Daniel Yousaf, Mian Ahsan Ali
Materials Sciences and Applications (MSA) , 2018, DOI: 10.4236/msa.2018.93022
Abstract: We investigate the effects of 2 MeV Ni+ ion beam irradiation with various fluence ranging from 15 × 1011 to 60 × 1014 ions/cm2 on the surface, structural and mechanical properties of Cu-Zn alloy. The modification in target properties after irradiation is confirmed by using various characterization techniques viz. SEM, XRD, UTM and Vickers micro-hardness tester. The SEM results illustrate the formation of nano sized craters with different diameters. Their average diameter decreases from 190 nm to 90 nm by increasing ion fluence. The XRD analysis of irradiated targets reveals that Ni+ ion irradiation enhances the growth of (111) phase and its peak position varies due to ion induced tensile stresses in target matrix. Tensile and Vickers micro-hardness tests verify the mechanical properties of Cu-Zn alloy reduce monotonically upon irradiation. Various mechanisms such as generation, recombination, augmentation and annihilation of ion induced defects are responsible for this reduction. Understanding the relationships between various modified properties of irradiated target is essential for growing new advanced material by irradiation.
e-System: Modern Trends in Design and Development
Ahsan Ali Chaudhri,Judith Symonds
International Journal of Emerging Sciences , 2012,
Abstract: The web service oriented architecture with predefined quality constructs is vital for the firm’s success. The research objectives were met through the literature review. There are many gaps in the previous studies and most of the research articles were focusing on one or two variables. Most of the studies were falling short of dealing with quality, Competitive advantage, and service oriented architecture simultaneously. The rationale of this study is based on the assumption that web based service delivery models are essential in the business environment to gain competitive advantage.
On a Curvature Tensor for the Spacetime of General Relativity
Zafar Ahsan,Musavvir Ali,Sirajuddin
Mathematics , 2015,
Abstract: In the differential geometry of certain F-structures, the role of W-curvature tensor is very well known. A detailed study of this tensor has been made on the spacetime of general relativity. The spacetimes satisfying Einstein field equations with vanishing W-tensor have been considered and the existence of Killing and conformal Killing vector fields has been established. Perfect fluid spacetimes with vanishing W-tensor have also been considered. The divergence of W-tensor is studied in detail and it is seen, among other results, that a perfect fluid spacetime with conserved W-tensor represents either an Einstein space or a Friedmann-Robertson-Walker cosmological model.
Impact of Pesticides Contamination on Nutritional Values of Marinefishery from Karachi Coast of Arabian Sea  [PDF]
Hina Ahsan, Nasim Karim, Syed Sanwer Ali, Alia B. Munshi, Sohail Shaukat
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.49120

The present study explores the chemical and economic aspects of pesticide contamination of marinefishery in relation to nutritional values Marine Pollution of pesticides poses signify can tricks to the environment and non-target organisms ranging from beneficial marine micro organisms, to insects, seaweeds, fish, and mangroves at Karachi Coast. Fish typically contains good quality nutrition, particularly oily fish has maximum commercial values but contamination of fishery is the major problem caused by pesticides and PCBs pollution resulting in serious health hazards. A number of fish and shell fish samples were analyzed for determination of pesticides contamination due to marine environment pollution. It was found that most pesticides pose risk to humans, fishery or the environment because they are designed to kill or adversely affect living organisms. Quantitative analysis of pesticides and PCBs was performed using GC equipped with ECD and the FPD for organophosphorus and GC-MS. The arithmetic mean concentrations of each pesticide were calculated and statistical evaluation was done. Relationship of protein and pesticides level has been determined to determine impact of pesticide on protein content of each type of fish. There is a considerable difference found in the pesticides contents of each type of fishery, which reveals that environmental pollution status that attributes towards pesticides distribution.

Modelling and Analysis of MRR, EWR and Surface Roughness in EDM Milling Through Response Surface Methodology
Akm Asif Iqbal,Ahsan Ali Khan
Journal of Engineering and Applied Sciences , 2012, DOI: 10.3923/jeasci.2010.154.162
Abstract: This study reports on the experimental investigations of Material Removal Rate (MRR), Electrode Wear Ratio (EWR) and surface Roughness (Ra) in EDM milling of stainless steel AISI 304. This research establishes empirical relations regarding machining parameters and the responses in analyzing the machinability of the stainless steel. The machining factors used are voltage, rotational speed of electrode and feed rate over the responses MRR, EWR and Ra. Response surface methodology was used to investigate the relationships and parametric interactions between the three controllable variables on the MRR, EWR and Ra. Central composite experimental design was used to estimate the model coefficients of the three factors. The responses were modeled using a response surface model based on experimental results. The significant coefficients were obtained by performing Analysis of Variance (ANOVA) at 95% level of significance. The developed models show that voltage and rotary motion of electrode are the most significant machining parameters influencing MRR, EWR and Ra. These models can be used to get the desired responses within the experimental range.
The Effect of Salesperson Trust, Preferential Treatment & Commitment on Customer’s Loyalty
International Review of Management and Business Research , 2013, DOI: 31/12/2013
Abstract: The paper shows the importance and effect of preferential treatment by salespersons & customerssalespersons relationship & trust for store loyalty. Providing preferential treatment and building trust of customers on salespersons can be very helpful for the managers to make their customers loyal. This long term relationship will help the retail store to gain profit and survive in the business world. A questionnaire was used to collect the data. Most of the data was collected from university students by using convenience sampling, but some respondents from different field of life was also included for the generalizability. A sufficient number of females are also included, as needed for the effective results of the study. Both, preferential treatment and trust on salespersons, shows a positive impact on building up the store loyalty. The result also shows that trust on salesperson has more impact on making the customers committed towards the salespersons and hence create them loyal towards the store.
Organizational Investment in Social Capital (OISC) and Employee Job Performance: Moderation by Employee Job Engagement
International Review of Management and Business Research , 2013, DOI: 31/12/2013
Abstract: This paper investigates the interactive effect of employee job engagement on the direct relation of organizational investment in social capital (OISC) and employee job performance. A lot of researchers studied on direct relationship of organizational social capital investment and job performance of the employee in west and east as well. This research will contribute to improve the performance of the frontline mangers and to identify the organizational culture which keeps the employee engage. The employee job engagement moderates the effect of organizational social capital investment and job performance of the employee. According to the author this paper will assess the investment of organization for the development of human resources. Authors based on social capital theory, purposed a model that test the relationship of organizational investment in human capital and job performance of the employee with interactive effect of employee job engagement. This study is questionnaire based and results are based on 150 frontline managers from multiple kinds of organization and suggest that organizational investment in social capital positively affect the performance of the employees, but the interactive effect of work engagement weaken this relation.
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