Haider ALI - Academia.edu (original) (raw)

Papers by Haider ALI

International Journal of Scientific Engineering and Technology, 2015

DSTATCOM is a custom power device that is used to regulate the voltage sags/swells in the distrib... more DSTATCOM is a custom power device that is used to regulate the voltage sags/swells in the distribution system for maintaining the rated voltage level at the terminal of load/sensitive loads. The DSTATCOM can inject three-phase voltages at point of common coupling whose magnitude and phase angle can be regulated with PI controller, while the super capacitors are used to meet the instantaneous power demand since they can store and quickly release significant amounts of energy. This paper explores the use of Super capacitors in DSTATCOM in place of battery for control of load terminal voltage.

Scientific reports, Jan 30, 2015

Recent developments in climate change have increased the frequency of dust storms in the Middle E... more Recent developments in climate change have increased the frequency of dust storms in the Middle East. Dust storms significantly influence the performances of solar energy harvesting systems, particularly (photovoltaic) PV systems. The characteristics of the dust and the mud formed from this dust are examined using various analytical tools, including optical, scanning electron, and atomic force microscopies, X-ray diffraction, energy spectroscopy, and Fourier transform infrared spectroscopy. The adhesion, cohesion and frictional forces present during the removal of dry mud from the glass surface are determined using a microtribometer. Alkali and alkaline earth metal compounds in the dust dissolve in water to form a chemically active solution at the glass surface. This solution modifies the texture of the glass surface, thereby increasing the microhardness and decreasing the transmittance of the incident optical radiation. The force required to remove the dry mud from the glass surfac...

American journal of public health, Jan 16, 2015

Islamic countries are of key importance to transnational tobacco companies as growing markets wit... more Islamic countries are of key importance to transnational tobacco companies as growing markets with increasing smoking rates. We analyzed internal tobacco industry documents to assess the industry's response to rising concerns about tobacco use within Islamic countries. The tobacco industry perceived Islam as a significant threat to its expansion into these emerging markets. To counter these concerns, the industry framed antismoking views in Islamic countries as fundamentalist and fanatical and attempted to recruit Islamic consultants to portray smoking as acceptable. Tobacco industry lawyers also helped develop theological arguments in favor of smoking. These findings are valuable to researchers and policymakers seeking to implement culturally appropriate measures in Islamic countries under the World Health Organization Framework Convention on Tobacco Control. (Am J Public Health. Published online ahead of print April 16, 2015: e1-e7. doi:10.2105/AJPH.2014.302494).

Canadian Journal of Physics, 2014

An analytical solution is developed for thermal stress in exponentially time decaying laser short... more An analytical solution is developed for thermal stress in exponentially time decaying laser short-pulse heating of a metallic surface. Because the heating duration is short, a nonequilibrium heating model incorporating the electron kinetic theory approach is used to formulate the temperature distribution during the laser heating pulse. Thermomechanical coupling is introduced in the analysis to formulate the thermal stress field. Thermodynamic irreversibility is considered and the entropy generation rate due to heat transfer and thermal stress field is formulated during the heating process. It is found that temperature decays gradually in the surface region and becomes sharp as the distance increases towards the solid bulk. Thermal stress is compressive in the irradiated region. Thermodynamic irreversibility due to heat transfer dominates thermodynamic irreversibility because of the thermal stress field.

International Journal of Exergy, 2015

ABSTRACT

2012 19th International Conference on Telecommunications (ICT), 2012

ABSTRACT Localization systems are most often based on time delay estimation (TDE) techniques. TDE... more ABSTRACT Localization systems are most often based on time delay estimation (TDE) techniques. TDE techniques based on channel impulse response (CIR) are effective in reverberant environment such as indoors. A recently developed algorithm called Orthogonal Clustering (OC) algorithm is one such algorithm that estimates the CIR utilizing a sparse signal reconstruction approach. OC is based on low complexity Bayesian method utilizing the sparsity constraint, the sensing matrix structure and the a priori statistical information. In practical systems several parameters affect the performance of a localization system based on OC TDE. Therefore, it is necessary to analyze the performance of an algorithm when certain parameters vary. In this paper we investigate the effect of variations in different parameters on the performance of the OC algorithm used in an impulsive acoustic source localization (IASL) system.

Robotics and Autonomous Systems, 2014

This article introduces the definition of Network Robot Systems (NRS) as is understood in Europe,... more This article introduces the definition of Network Robot Systems (NRS) as is understood in Europe, USA and Japan. Moreover, it describes some of the NRS projects in Europe and Japan and presents a summary of the papers of this Special Issue.

Journal of Marketing Management, 1998

The 'credibility gap' is not often cited as a problem by marketers; for this reason marketing tex... more The 'credibility gap' is not often cited as a problem by marketers; for this reason marketing texts pay little or no attention to it. Yet, for the entrepreneurial marketer it may well be the most fundamental marketing challenge. Addressing the credibility gap may not have received any previous research interest, but theoretical support for its relevance abounds. Risk and its corollary, making use of trust, have been seen as quintessentially entrepreneurial activities. If they do epitomise entrepreneurship, then surely, studying how entrepreneurs use trust ought to provide valuable insights into what entrepreneurs do. While there is increasing research into trust, particularly from an organisational behaviour perspective, there is none in an entrepreneurial context. This lack of research provides the reason for the exploratory nature of this investigation. The search for trust in this investigation focuses on entrepreneurs' usage of elements of the marketing mix. Respondents are asked about what they have done, why they have taken that course of action and what the outcomes have been. We find that there is a wide panoply of ways in which entrepreneurs use trust., for example 'enthusiasm' and 'shared values'. The latter two are particularly important because they can lead to trust in situations where there may not already be existing relationships (the most likely place for finding trust). We also identify the methods entrepreneurs use to build trust-which they can then use to mitigate customers' perception of risk. This paper starts with the presentation of a model which summarises some existing research into how trust functions, in the light of our findings adaptations to this model are then made in order to highlight the contribution of this research.

Journal of Marketing Management, 2011

Abstract When it comes to health, how is value exchanged on a personal basis within a specific cu... more Abstract When it comes to health, how is value exchanged on a personal basis within a specific cultural context? In this paper, the cultural and social context of social support, particularly emotional support from social network members, is assessed and areas for further study identified. ...

Energy Conversion and Management, 2014

Thermoelectric generators (TEG) are cost effective solid-state devices with low thermal efficienc... more Thermoelectric generators (TEG) are cost effective solid-state devices with low thermal efficiencies. The limitations, due to the operational temperature of the thermoelectric materials, suppress the Carnot efficiency increase of the device. Although thermoelectric generators have considerable advantages over the other renewable energy devices, low convergence efficiency of the device retains thermoelectric devices behind its competitors. In order to keep up with the competition, improvement of device efficiency becomes crucial for the practical applications. The design configuration of the device pin legs, lowering the overall thermal conductance, can improve the device efficiency. Therefore, in the present study, the influence of pin leg geometry on thermal performance of the device is formulated thermodynamically. In this case, the exponential area variation of pin legs is considered and dimensionless geometric parameter 'a' is introduced in analysis. The influence of dimensionless geometric parameter on efficiency and power output is demonstrated for different temperature ratios and external load resistance ratios. It is found that increasing dimensionless geometric parameter improves the thermal efficiency of the device; however, the point of maximum efficiency does not coincide with the point of the maximum device output power.

Journal of Applied Geodesy, 2009

High accuracy 3D representation and monitoring of objects is receiving increasing interest both i... more High accuracy 3D representation and monitoring of objects is receiving increasing interest both in science and industrial applications. Up to now tasks like monitoring of building displacements or deformations were solved by means of artificial targets on the objects of interest, although mature optical 3D measurement and laser scanning techniques are available. Such systems can perform their measurements even without targeting. This paper presents a new optical 3D measurement system, based on the fusion between a geodetic image sensor and a laser scanner. The main goal of its development was the automation of the whole measurement process, including the tasks of point identification and measurement, deformation analysis, and interpretation. This was only possible by means of new methods and techniques originally developed in the area of Artificial Intelligence; both point detection and deformation analysis are supported by decision systems that use such techniques. The resulting complex multi-sensor system is able to measure and analyse the deformation of objects, as shown in experiments. In this article we focus on specific key components and novel techniques that have been developed, and briefly report on the current stage of the whole system.