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Search Results: 1 - 10 of 737156 matches for " R. M. S. Mahmood "
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A remark on the intersection of the conjugates of the base of quasi-HNN groups
R. M. S. Mahmood
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s0161171204309191
Abstract: Quasi-HNN groups can be characterized as a generalization of HNN groups. In this paper, we show that if G∗ is a quasi-HNN group of base G, then either any two conjugates of G are identical or their intersection is contained in a conjugate of an associated subgroup of G.
On centralizers of elements of groups acting on trees with inversions
R. M. S. Mahmood
International Journal of Mathematics and Mathematical Sciences , 2003, DOI: 10.1155/s0161171203205305
Abstract: A subgroup H of a group G is called malnormal in G if it satisfies the condition that if g∈G and h∈H, h≠1 such that ghg−1∈H, then g∈H. In this paper, we show that if G is a group acting on a tree X with inversions such that each edge stabilizer is malnormal in G, then the centralizer C(g) of each nontrivial element g of G is in a vertex stabilizer if g is in that vertex stabilizer. If g is not in any vertex stabilizer, then C(g) is an infinite cyclic if g does not transfer an edge of X to its inverse. Otherwise, C(g) is a finite cyclic of order 2.
On fundamental domains in groups acting on connected graphs
R. M. S. Mahmood
International Journal of Algebra , 2012,
Abstract:
On invertor elements and finitely generated subgroups of groups acting on trees with inversions
R. M. S. Mahmood,M. I. Khanfar
International Journal of Mathematics and Mathematical Sciences , 2000, DOI: 10.1155/s0161171200002969
Abstract: An element of a group acting on a graph is called invertor if it transfers an edge of the graph to its inverse. In this paper, we show that if G is a group acting on a tree X with inversions such that G does not fix any element of X, then an element g of G is invertor if and only if g is not in any vertex stabilizer of G and g2 is in an edge stabilizer of G. Moreover, if H is a finitely generated subgroup of G, then H contains an invertor element or some conjugate of H contains a cyclically reduced element of length at least one on which H is not in any vertex stabilizer of G, or H is in a vertex stabilizer of G.
Subgroups of quasi-HNN groups
R. M. S. Mahmood,M. I. Khanfar
International Journal of Mathematics and Mathematical Sciences , 2002, DOI: 10.1155/s0161171202103012
Abstract: We extend the structure theorem for the subgroups of the class of HNN groups to a new class of groups called quasi-HNN groups. The main technique used is the subgroup theorem for groups acting on trees with inversions.
Host Range of Pakistan Strain of Lysiphlebus ambiguus (Haliday) (Hymenoptera: Braconidae) as Determined in the Laboratory
S. Anjum,M. Ashraf Poswal,R. Mahmood
Asian Journal of Plant Sciences , 2002,
Abstract: Introduction of a parasitoid in new locality is not without risk to indigenous insect`s community, therefore, host range of the parasitoid Lysiphlebus ambiguus associated with Sipha maydis in Pakistan was studied. Eighteen species of aphids mostly associated with graminaceous crops and some others were tested in laboratory to determine their suitability as hosts of L. ambiguus. In 15 minute observation time the parasitoid made significantly higher number of antennal tapping and ovipositional attempts on S. maydis (26.8 and 20.8 respectively) than on other species. Although, it made many tapping and ovipositional attempts on Brevicoryne brassicae (12.2 and 6.0, respectively) it did not complete development in this species. The parasitoid strain existing in Pakistan seems to be highly specific to S. maydis as it completed development only on this species and therefore, poses no risk of parasitization of non target species.
Effect of Seeding Density on the Fodder Yield and Quality of Two Maize Varieties
M. Ayub,R. Mahmood,A. Tanveer,M. S. Sharar
Pakistan Journal of Biological Sciences , 1999,
Abstract: Two varieties of maize viz., Neelum and Akbar were compared at seed rates of 75, 100, 125 and 150 kg ha-1 in Faisalabad conditions. Varieties showed non-significant differences for all parameters studied except dry matter yield. Cultivar Akbar gave significantly more DM yield (7.18 t ha-1) than Neelum (6.09 t ha-1). Seeding densities showed significant effects on growth and yield parameters. Plant height, green fodder yield, dry matter yield and crude fibre percentage was increased with increasing seed density, whereas, the increase in crude fibre percentage could not reach to a significant level. While, stem diameter, leaf area plant-1, crude protein percentage, total ash percentage and ether extractable fat percentage decreased significantly with increased seed rate. The cultivar Akbar and seed rate of 150kg ha-1 seems to be the best for producing higher fodder yield of maize in Faisalabad conditions.
Evaluation of Wound Healing Potential of Ageratum Conyzoides Leaf Extract in Combination with Honey in Rats as Animal Model
M.R. Mustafa,A.A. Mahmood,K. Sidik,S.M. Noor
International Journal of Molecular Medicine and Advance Sciences , 2011,
Abstract: The aqueous extract of Ageratum conyzoides leaves in combination with honey were investigated for evaluation of their wound healing potential in rats. Three groups of male Sprague Dawley rats each consist of 6 animals. Rats were placed individually in cages and all animals were experimentally wounded in the posterior neck area. Pure honey was applied topically to wounds of Group 1 animals. Wounds of Group 2 rats were treated with Ageratum conyzoides leaves extract in combination with honey (100 mg leaf extract/ml of honey w/v), and solcoseryl ointment was applied topically to wounds of Group 3 animals as a reference. The effects of vehicles on the rate of wound infection and on the rate of wound healing were assessed. Wounds of all groups of animals showed clean and remain sterile throughout the experiment. Wounds treated with plant extract in combination with honey, and wounds treated with solcosery ointment significantly (p<0.05) accelerate wound healing potential compared to wounds treated with honey alone. These results strongly document the beneficial effects of plant extract for the acceleration of wound healing process and the rates of wounds sterility.
A Survey of Different Residential Energy Consumption Controlling Techniques for Autonomous DSM in Future Smart Grid Communications
M. N. Ullah,A. Mahmood,S. Razzaq,M. Ilahi,R. D. Khan,N. Javaid
Computer Science , 2013,
Abstract: In this work, we present a survey of residential load controlling techniques to implement demand side management in future smart grid. Power generation sector facing important challenges both in quality and quantity to meet the increasing requirements of consumers. Energy efficiency, reliability, economics and integration of new energy resources are important issues to enhance the stability of power system infrastructure. Optimal energy consumption scheduling minimizes the energy consumption cost and reduce the peak-to-average ratio (PAR) as well as peak load demand in peak hours. In this work, we discuss different energy consumption scheduling schemes that schedule the household appliances in real-time to achieve minimum energy consumption cost and reduce peak load curve in peak hours to shape the peak load demand.
Home Energy Management Systems in Future Smart Grids
I. Khan,A. Mahmood,N. Javaid,S. Razzaq,R. D. Khan,M. Ilahi
Computer Science , 2013,
Abstract: We present a detailed review of various Home Energy Management Schemes (HEM,s). HEM,s will increase savings, reduce peak demand and Pto Average Ratio (PAR). Among various applications of smart grid technologies, home energy management is probably the most important one to be addressed. Various steps have been taken by utilities for efficient energy consumption.New pricing schemes like Time of Use (ToU), Real Time Pricing (RTP), Critical Peak Pricing (CPP), Inclining Block Rates (IBR) etc have been been devised for future smart grids.Home appliances and/or distributed energy resources coordination (Local Generation) along with different pricing schemes leads towards efficient energy consumption. This paper addresses various communication and optimization based residential energy management schemes and different communication and networking technologies involved in these schemes.
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