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Search Results: 1 - 10 of 4662 matches for " Yawar Ismail Khalid "
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Demand Response Management For Power Throttling Air Conditioning Loads In Residential Smart Grids
Yawar Ismail Khalid,Naveed Ul Hassan,Chau Yuen,Shisheng Huang
Computer Science , 2014,
Abstract: In this paper we develop an algorithm for peak load reduction to reduce the impact of increased air conditioner usage in a residential smart grid community. We develop Demand Response Management (DRM) plans that clearly spell out the maximum duration as well as maximum severity of inconvenience. We model the air conditioner as a power throttling device and for any given DRM plan we study the impact of increasing the number of power states on the resulting peak load reduction. Through simulations, we find out that adding just one additional state to the basic ON/OFF model, which can throttle power to 50% of the rated air conditioner power, can result in significant amount of peak reduction. However, the peak load that can be reduced is diminishing with the increase in number of states. Furthermore, we also observe the impact of inconvenience duration and inconvenience severity in terms of peak load reduction. These observations can serve as useful guidelines for developing appropriate DRM plans.
Customer Engagement Plans for Peak Load Reduction in Residential Smart Grids
Naveed Ul Hassan,Yawar Ismail Khalid,Chau Yuen,Wayes Tushar
Computer Science , 2015,
Abstract: In this paper, we propose and study the effectiveness of customer engagement plans that clearly specify the amount of intervention in customer's load settings by the grid operator for peak load reduction. We suggest two different types of plans, including Constant Deviation Plans (CDPs) and Proportional Deviation Plans (PDPs). We define an adjustable reference temperature for both CDPs and PDPs to limit the output temperature of each thermostat load and to control the number of devices eligible to participate in Demand Response Program (DRP). We model thermostat loads as power throttling devices and design algorithms to evaluate the impact of power throttling states and plan parameters on peak load reduction. Based on the simulation results, we recommend PDPs to the customers of a residential community with variable thermostat set point preferences, while CDPs are suitable for customers with similar thermostat set point preferences. If thermostat loads have multiple power throttling states, customer engagement plans with less temperature deviations from thermostat set points are recommended. Contrary to classical ON/OFF control, higher temperature deviations are required to achieve similar amount of peak load reduction. Several other interesting tradeoffs and useful guidelines for designing mutually beneficial incentives for both the grid operator and customers can also be identified.
Effect of two methods of grilling on the oxidative rancidity and cholesterol oxidation in beef and chicken shawerma
Al-Ismail, Khalid
Grasas y Aceites , 2002,
Abstract: The effect of direct blue and charcoal radiation heat grilling on the oxidative rancidity of fat and cholesterol oxidation in beef and chicken shawerma was studied during the first 3 hours of grilling process. The oxidative rancidity of the fat was measured by thiobarbituric acid value (TBA), while that of cholesterol by evaluating the concentration of 7-ketocholesterol. No significant effect (pa ¤ 0.05) of the source of the grilling radiation heat was found on TBA values or 7-ketocholesterol content. The degree of unsaturation of the fat had significant effect (pa ¤0.05) on TBA and 7-ketocholesterol values. TBA values and 7-ketocholesterol for both samples grilled either by direct blue or charcoal radiation heat reached maximum values after 30 min of the heat treatment then they remained relatively constant throughout the rest time of the experiment. El efecto de dos formas de asado sobre la rancidez oxidativa de la grasa y la oxidación de colesterol en a shawermaa de ternera y pollo fue estudiado durante las tres primeras horas del proceso de asado. La rancidez oxidativa de la grasa fue medida por el índice de ácido tiobarbitúrico (TBA), mientras que el colesterol fue determinado evaluando la concentración de 7-cetocolesterol. No hubo efecto significativo (p .0.05) de la fuente de radiación utilizada en el proceso de asado sobre los índices de TBA o el contenido de 7-cetocolesterol. El grado de instauración de la grasa tuvo un efecto significativo (p .0.05) sobre los índices de TBA y el 7-cetocolesterol. Los valores de TBA y 7-cetocolesterol para las dos formas de asado alcanzaron los máximos después de 30 minutos de calentamiento para luego permanecer relativamente constante durante el resto del tiempo del experimento.
ROUTE MAINTENANCE APPROACH FOR LINK BREAKAGE PREDICTION IN MOBILE AD HOC NETWORKS
Khalid Zahedi,Abdul Samad Ismail
International Journal of Advanced Computer Sciences and Applications , 2011,
Abstract: Mobile Ad hoc Network (MANET) consists of a group of mobile nodes that can communicate with each other without the need of infrastructure. The movement of nodes in MANET is random; therefore MANETs have a dynamic topology. Because of this dynamic topology, the link breakages in these networks are something common. This problem causes high data loss and delay. In order to decrease these problems, the idea of link breakage prediction has appeared. In link breakage prediction, the availability of a link is evaluated, and a warning is issued if there is a possibility of soon link breakage. In this paper a new approach of link breakage prediction in MANETs is proposed. This approach has been implemented on the well known Dynamic Source Routing protocol (DSR). This new mechanism was able to decrease the packet loss and delay that occur in the original protocol.
Evaluation of the toxicity of Streptomyces aburaviensis (R9) extract towards various agricultural pests  [PDF]
Ismail Saadoun, Sereen Bataineh, Qutaiba Ababneh, Khalid Hameed, Kevin Schrader, Charles Cantrell, Franck Dayan, David Wedge
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.24063
Abstract: The dichloromethane extract of culture filtrate from Streptomyces aburaviensis R9 was evaluated using various rapid bioassays to determine potential inhibitory effects towards phytopathogenic fungi (Colletotrichum acutatum, C. fragariae, C. gloeosoprioids, Botrytis cinerea, Fusarium oxysporum, Phomopsis viticola and P. obscurans), fish bacterial pathogens (Edwardsiella ictaluri and Flavobacterium columnare), a green alga (Selenastrum capricornutum), plant seeds [Bent grass (Agrostis sp.) monocot and lettuce (Lactuca sativa) dicot] and 2-methylisoborneol (MIB)-producing cyanobacteria (Planktothrix perornata and Pseudanabaena sp.). The dichloromethane extract showed selective inhibition against the cyanobacterium P. perornata, with a lowest-complete-inhibition concentration (LCIC) of 10 mg/L and lowest-observed-effect concentration (LOEC) of 10 mg/L while LCIC and LOEC values were 100 mg/L when tested against S. capricornutum. This extract also showed slight meristematic cytogenic necrosis at 200 mg/L towards germinated seeds of both test plants. The compounds were not very toxic towards the channel catfish (Ictalurus punctatus) pathogenic bacteria E. ictaluri and F. columnare. Preliminary evaluation of the extract toward C. acutatum, C. fragariae and C. gloeosoprioids using TLC bioautography revealed moderate activity. However, further evaluation of the extract using a microtiter plate bioassay determined that inhibition was strongest against C. acutatum and C. fragariae, though this inhibitory activity diminished at 72 hours and was moderately less active than the commercial fungicides azoxystrobin and captan when comparing 1 - 100 mg/L levels at 48 hours.
Knowledge and beliefs concerning evidence-based practice amongst complementary and alternative medicine health care practitioners and allied health care professionals: A questionnaire survey
Julie Hadley, Ismail Hassan, Khalid S Khan
BMC Complementary and Alternative Medicine , 2008, DOI: 10.1186/1472-6882-8-45
Abstract: To compliment an EBP course for allied health care professionals and CAM practitioners, we undertook a questionnaire survey to assess learning needs. We developed a questionnaire to measure allied health care professionals and CAM practitioners' basic knowledge, skills and beliefs concerning the main principles of EBP. The questionnaires were administered to all attendees of one-day EBP workshops.During 2004–5 we surveyed 193 allied health care professionals and CAM practitioners who attended one-day EBP courses prior to commencement of teaching. Of the respondents 121 (62.7%) were allied health care professionals and 65 (33.7%) practitioners stated that they work in the CAM field Our survey found that the majority of the respondents had not previously attended a literature appraisal skills workshop (87.3%) or received formal training in research methods (69.9%), epidemiology (91.2%) or statistics (80.8%). Furthermore, 67.1% of practitioners specified that they felt that they had not had adequate training in EBM and they identified that they needed more training and education in the principles of EBM (86.7%). Differences in knowledge and beliefs concerning EBP amongst allied and CAM practitioners were found and length of time since qualification was also found to be an important factor in practitioner's beliefs. More CAM practitioners compared to allied health professionals accessed educational literature via the Internet (95.3% v 68.1%, p = 0.008). Whilst, practitioners with more than 11 years experience felt that original research papers were far more confusing (p = 0.02) than their less experienced colleagues.The results demonstrate that practitioner's learning needs do vary according to the type of profession, time since graduation and prior research experience. Our survey findings are exploratory and will benefit from further replication, however, we do believe that they warrant consideration by allied health care and CAM tutors and trainers when planning EBP t
Glassy behaviour of random field Ising spins on Bethe lattice in external magnetic field

Khalid Bannor,Galal Ismail,Wafaa Hassan,

中国物理 B , 2011,
Abstract:
Glassy phase and thermodynamics for random field Ising model on spherical lattice in magnetic field

Khalid Bannor,Galal Ismail,Wafaa Hassan,

中国物理 B , 2010,
Abstract:
Antioxidant activity of alcohol extracts of chamomile flowers, anise seeds and dill seeds in two vegetable oils and two animal fats
Qasem, Ahmed,Al-Ismail, Khalid
Grasas y Aceites , 2004,
Abstract: The antioxidant activity of alcohol extracts of chamomile flowers (CFE), anise seeds (ASE) and dill seeds (DSE) in corn oil, soybean oil, beef tallow and anhydrous butter fat (ABF) was investigated during storage at 65 oC. The extent of oxidation was followed by peroxide value (PV). In addition, reducing power of these extracts was determined. Alcohol extracts of these plants at 3 g kg-1 were more effective as antioxidant than BHA (0.2 g kg-1) in corn and soybean oils, while they were less effective in beef tallow and ABF. CFE was more effective in retarding fat oxidation in corn and soybean oil than ASE and DSE, which both showed similar activity. However, in beef tallow and ABF all extracts showed similar activities. On the other hand, the reducing power of these extracts showed different behavior. CFE, which was the most active as antioxidant among the extracts showed the lowest reducing power. Furthermore, ASE and DSE, which exhibited similar antioxidant activity, the former has lower reducing activity than the latter, indicating that the antioxidant activity didna t correlate linearly with the reducing power of these extracts. Se investigó la actividad antioxidante de extractos alcohólicos de flores de camomila (CFE), semillas de anís (ASD) y eneldo (DSE) en aceites de maíz y soja, sebo y grasa de mantequilla anhidra (ABF), almacenados a 65 oC. El seguimiento de la oxidación se realizó mediante el índice de peróxidos. Además, se determinó el poder reductor de los mismos. La actividad antioxidante de los extractos alcohólicos de estas plantas (3 g k -1) resultó más eficaz que la del BHA (0.2 g kg-1), en cambio, resultaron menos eficaces en el sebo y ABF. El extracto de manzanilla resultó ser mejor antioxidante para los aceites de maíz y soja que los extractos ASE y DSE, ambos mostraron una actividad similar. Sin embargo, en el sebo y la ABF todos los extractos revelaron una actividad antioxidante parecida. El poder reductor de estos extractos mostró un comportamiento diferente. El CFE que fue el extracto más activo como antioxidante presentó el menor poder reductor, además, mientras que los extractos ASE y DSE presentaron una actividad antioxidante similar, el primero de ellos mostró un poder reductor inferior, indicando que la actividad antioxidante no se correlaciona linealmente con el poder reductor de estos extractos.
Comment on "Dielectric screening and plasmons in AA-stacked bilayer graphene"
Yawar Mohammadi
Physics , 2014,
Abstract: In this comment we show that some equations and results of the paper titled "Dielectric screening and plasmons in AA-stacked bilayer graphene" are not correct. Furthermore, we present our results which seems to be more correct.
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