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Search Results: 1 - 10 of 8303 matches for " Zulfikar Ahmad Zaidi "
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FEDRP Based Model Implementation of Intelligent Energy Management Scheme for a Residential Community in Smart Grids Network  [PDF]
Qamar Zia, Muhammad Ali, Zulfikar Ahmad Zaidi, Chaudhry Arshad, Amjad Ullah, Hafeez ur Rahman, Muhammad Ahsan Shahzad, Beenish Taj
Smart Grid and Renewable Energy (SGRE) , 2012, DOI: 10.4236/sgre.2012.34045
Abstract: In the framework of liberalized deregulated electricity market, dynamic competitive environment exists between wholesale and retail dealers for energy supplying and management. Smart Grids topology in form of energy management has forced power supplying agencies to become globally competitive. Demand Response (DR) Programs in context with smart energy network have influenced prosumers and consumers towards it. In this paper Fair Emergency Demand Response Program (FEDRP) is integrated for managing the loads intelligently by using the platform of Smart Grids for Residential Setup. The paper also provides detailed modeling and analysis of respective demands of residential consumers in relation with economic load model for FEDRP. Due to increased customer’s partaking in this program the load on the utility is reduced and managed intelligently during emergency hours by providing fair and attractive incentives to residential clients, thus shifting peak load to off peak hours. The numerical and graphical results are matched for intelligent energy management scenario.
PHYSICAL BEHAVIOUR OF FOAMED CONCRETE UNDER UNI-AXIAL COMPRESSIVE LOAD: CONFINED COMPRESSIVE TEST
Ahmad Mujahid Ahmad Zaidi
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n2p126
Abstract: Foamed concrete now is a common material used in civil engineering work. There are increasing amount in research where foamed concrete are used primarily to resist compression force. In this research, physical behaviour of foamed concrete was investigated. Based on the past research, the compressive strength of foamed concrete typically proportioned to achieve only low compressive strength in unconfined condition. Standard compressive test were performed to obtain the compressive strength of foamed concrete. In this research, the confined condition is produced. Unconfined condition also was done, but here just focused on confined condition. The confined compressive test method consist of applying a compressive axial load to moulded cylinders at a rate which is within a prescribe range until failure occurs. The physical behaviour of foamed concrete under confined condition is the continuity of unconfined condition and will be the guidance to conduct the further research Keywords: foamed concrete, confined compressive test, mode of failure
ASSESSMENT OF RECYCLED AGGREGATE CONCRETE
Ahmad Mujahid Ahmad Zaidi
Modern Applied Science , 2009, DOI: 10.5539/mas.v3n10p47
Abstract: Used of recycled aggregate (RA) in concrete can be described in environmental protection and economical terms. The application of recycled aggregate to use in construction activities have been practice by developed European countries and also of some Asian countries. This paper reports the results of an experimental study on the mechanical properties of recycled aggregate concrete (RAC) as compared to natural aggregate concrete (NAC). The effects of size of RA on compressive strength were discussed in this paper. The 100% of RA used in concrete mix to replace the natural coarse aggregate in concrete with 100 x 100 x 100 cube mm were cast with target compressive strength is 25 MPa. The 28-day compressive strength was crushed at 3, 14, 28 days are reported. It was found the size of 10mm and 14 mm of RA in RAC is quite similar performance with 10mm and 14mm size of natural aggregate (NA) in natural aggregate concrete (NAC). Keywords: Concrete, Recycled aggregate properties, performance of recycled aggregate concrete.
Application of Coordinate Resistance Functions on Predicting of Critical Impact Energy of Projectile for Perforation Phenomenon on Concrete Structure
Ahmad Mujahid Ahmad Zaidi
Journal of Mathematics Research , 2009, DOI: 10.5539/jmr.v1n2p13
Abstract: Great demand exist for more efficient design to protect personals and critical components against impact by kinetic missiles, generated both accidentally and deliberately, in various impact and blast scenarios in both civilian and military activities. In many cases, projectiles can be treated as rigid bodies when their damage and erosion are not severe. Due to the intricacy of the local impact damages, investigations are generally based on experimental data. Conclusions of the experimental observations are then used to guide engineering models. Local damages studies normally fall into three categories, i.e. empirical formulae based on data fitting, idealised analytical models based on physic laws and numerical simulations based on computational mechanics and material models. Perforation phenomenon is one of the local damage that has been investigated in the present study. It is describe as the complete passage of the projectile through the material with or without residual velocity is among the local damage threat in concrete structure. The relative of target thickness (H/d) to those critical energies are an important quantities that been explored in this study. The numerical simulation model has been developed using coordinate resistance function method for predict the perforation process. The target structures is described based on coordinate system in a mesh-less way, which impose penetration resistance on the projectile through resistance function based on dynamic cavity expansion theory. The penetration resistance on the surface of the rigid projectile is a function of the instantaneous velocity of that surface, which can be determined by the rigid body motion of the projectile. Standard finite element method is introduced to model the rigid body motion of the projectile and is coupled with the coordinate resistance in a mesh-less target by exchanging the velocities and stresses through user-interfaces. Predictions of the critical impact energies during perforation process are compared with semi-empirical model and corresponding experimental data. Encouraging predictions are observed when the model was validated with the existing experimental data.
Understanding the Concept of Dynamic Capabilities by Dismantling Teece, Pisano, and Shuen (1997)’s Definition
Mohamad Faizal Ahmad Zaidi,Siti Norezam Othman
International Journal of Academic Research in Business and Social Sciences , 2012,
Abstract: The concept of dynamic capabilities (DCs) is gaining popularity in management field particularly in strategic management. The concept that is still new and contemporary has attracted many arguments that may lead to confusion. To understand the basic concept of DCs, looking back to the definition in Teece, Pisano and Shuen 1997’s working paper will be crucial not just because the authors are among the first to seriously promote DCs but also among the most referred article in the management field of 1990s and even still today. Hence, the objective of this review paper is to understand the basic concept of DCs by scrutinizing the definition in Teece, Pisano and Shuen (1997) that will give benefit to those who are new to the concept and wanting a quick insight on it. The definition is dismantled into six questions where the contested arguments (when applicable) relating to each of the questions are drawn from mainly various DCs literature that is not means to be conclusive and exhaustive.
Economics of Wheat Production in District Faisalabad
Manzoor Ahmad,S. Hassan Raza Zaidi
Journal of Applied Sciences , 2003,
Abstract: Wheat is the single largest staple food crop of Pakistan. But it is the irony of fate that average yield per hectare of Wheat is very low in Pakistan as compared to other countries. There are many physiological and agronomic factors responsible for this menace. Among these the most important are inadequate and unbalanced application of fertilizer and manure, poor crop management practices bad quality of soil, irrigation deficiency at critical stages, lack of usage of HYVs, high weed intensity in the fields etc. This study was conducted, using the primary data, in order to undertake the economic analysis of the different factors on the farm based categories: small, medium, large and the productivity based categories: low, medium, high. In the economic analysis gross margins, marginal costs and marginal rates of returns were evaluated from the primary data collected from district Faisalabad.
Application Design for Modularity Approach to Enhance Platform Architecture
Ahmad Baharuddin Abdullah,Zaidi Mohd Ripin
Journal of Applied Sciences , 2006,
Abstract: The objective of this study, is to apply modularity approach to enhance platform identification from a family of product. Firstly several variants of products from same family are identified and then modules are developed by using conventional approach. Finally the platform is established by using a proposed approach. A case study of appliances fan family has been carried to clarify the work. The result shows that a systematic approach has been developed to form platform that can increased the design variants. The commonality and assembly criteria of the new design have been evaluated and show a tremendous improvement.
Anticonvulsant, Anxiolytic and Neurotoxicity Profile of Aqarqarha (Anacyclus pyrethrum) DC (Compositae) Root Ethanolic Extract  [PDF]
Syed Mohd Abbas Zaidi, Shadab Ahmad Pathan, Surender Singh, Shakir Jamil, Farhan Jalees Ahmad, Roop Krishen Khar
Pharmacology & Pharmacy (PP) , 2013, DOI: 10.4236/pp.2013.47077
Abstract: Ethnopharmacological relevance: Aqarqarha (Anacyclus pyrethrum) DC root has long been used as a traditional an-tiepileptic remedy in Unani system of medicine over centuries. Aim of the Study: To rationalize the ethnomedical claim and screen for anxiolytic and neurotoxicity profile of ethanolic extract of Aqarqarha (Anacyclus pyrethrum) root (APE). Materials and Methods: The anticonvulsant and anxiolytic potential of APE (100-800 mg/kg) was evaluated against Pentylenetetrazole (PTZ), Bicuculline (BCL), Increasing current electroshock (ICES) and Elevated plus maze(EPM) models. Rotarod test was employed as neurotoxicity model including an additional higher dose (1600 mg/kg). Results: The APE showed significant anticonvulsant activity (p < 0.001) against PTZ (70 mg/kg, i.p.) in a dose-dependent manner but against BCL (30 mg/kg, i.p.) at the dose 800 mg/kg only (p < 0.001). However, it did not protect animals against ICES induced seizures (p > 0.05). The extract also showed anxiolytic behaviour in EPM (p < 0.001) and impaired motor coordination only at 1600 mg/kg in rotarod performance. HPTLC of the extract confirmed the presence of eugenol in the extract. Conclusions: The results suggested significant anticonvulsant activity of APE against PTZ and BCL but failure against ICES. Moreover, APE also exhibited anxiolytic potential without any evidence of neurotoxicity at the effective dose level. We concluded that anticonvulsant effect of APE is probably mediated by enhancing GABAergic neurotransmission.
Evaluation of Acute and Repeated Dose Toxicity of the Polyherbal Formulation Linkus Syrup in Experimental Animals  [PDF]
Allah Nawaz, Saira Bano, Zeeshan Ahmed Sheikh, Khan Usmanghani, Iqbal Ahmad, Syed Faisal Zaidi, Aqib Zahoor, Irshad Ahmad
Chinese Medicine (CM) , 2014, DOI: 10.4236/cm.2014.54022
Abstract: The objective of the present study was to evaluate the pre-clinical efficacy and toxicity of polyherbal cough syrup Linkus. Method: Animals (healthy Wistar albino rats; (150 - 250 g) of either sex) were housed under standard environmental conditions; i.e. 25°C ± 1°C and 12 h dark/light cycle. Food and water were available at libitum. The rats were treated orally with the recommended doses of the test drug (Linkus). After 15 minutes, they were individually placed in a closed Plexiglas chamber (20 × 10 × 10 cm) and exposed to citric acid (0.1 g/ml) inhalation for 7 minutes. The cough reflexes were produced and counted for the last 5 minutes and compared with those of the control animals. The following studies were conducted to evaluate the toxicity of the test drug in healthy Wistar albino rats: lethal dose50 (LD50); rats of either sex (n = 10/sex) were treated orally with doses (1 or 5 g/kg) of the test drug. Mortality and behavioral changes were observed for 1 week. Repeated dose toxicity on the healthy Wistar albino rats of both sexes (n = 5/dose/sex) was treated orally with doses of 20 mg/kg (adult human dose = ~1400 mg), 500 mg/kg (adult human dose = ~35,000 mg) and 1000 mg/kg (adult human dose = ~70,000 mg) of test drug (Linkus) for 14 days. Additionally, the control animals were treated orally with water for 14 days. Results: In female rats, the test drug (Linkus) at the dose of 300 mg/kg caused significant (p < 0.01) reduction in the cough reflexes as compared to the control. However, in male rats, a significant reduction was observed at the tested dose of 200 mg/kg (p < 0.05) and 300 mg/kg (p < 0.01). The test product did not cause mortality in rats at the given doses of 1 or 5 g/kg. Other signs of toxicity like hair loss and weight reduction were not observed. In female and male rats, the test drug (Linkus) at different doses did not show any abnormal effects on complete blood count profile of rats. Serum enzyme markers, i.e. alanine aminotransferase (ALT), alakaline phosphatase, gamma glutamyle transferase (GGT), direct bilirubin, creatinine, and proteins were also observed and found that the test drug at a higher dose did not cause any of the abnormality and had shown significant p value as compared to the control. Conclusion: The test drug (Linkus) could be an effective and safe cough syrup because it did not show any of the side effects or toxicity on experimental animals.
The Making of Indonesian Education: An Overview on Empowering Indonesian Teachers
Teuku Zulfikar
Journal of Indonesian Social Sciences and Humanities , 2010,
Abstract: Education is one of the fundamental priorities of nation building. For this reason, the Indonesian government continuously seeks to improve the quality of its education. Empowering education can be done using many strategies, such as reforming school curricula or school systems or both. This article approaches the improvement of Indonesian education from a different angle, by considering teachers and the teaching profession. Before proposing an agenda for improving teachers, the article considers two main problems of Indonesian teachers: the practice of teacher-centred classroom pedagogy; and the emphasis on rote learning in the classroom. In response to these phenomena, this article suggests two main factors responsible for the persistence of such teaching styles: institutional cultures and the nature of assessment systems in Indonesian schools. This article has three recommendations to help Indonesian teachers improve. However, the author is aware that the agendas for improvement are complex and institutional reforms are needed; for example, the reform of teacher recruitment; teacher evaluation and also the reform of assessment systems. This article includes a discussion of what makes for a good teacher, which will help Indonesian teachers to gain an insight to their profession, and a discussion of the changes that could be made to enable the quality of teaching to improve.
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