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Search Results: 1 - 10 of 480622 matches for " Kumar A "
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Locational marginal prices with SVC in Indian electricity market
A Kumar, P Kumar
International Journal of Engineering, Science and Technology , 2011,
Abstract: Spot pricing based on short run marginal cost (SRMC) theory has the potential to provide the economic signals for the power system operation. Reactive power has gained importance as an ancillary service in competitive markets and its impact on nodal price can not be ignored. With the emergence of FACTS technology, their role in the marginal price determination should be considered taking their cost function into account. In this paper, the nodal price for real and reactive power considering different reactive power price cost calculation methods for generator reactive power has been presented. The impact of Static Var Compensator has also been considered taking their cost function into account. Mixed integer non-linear programming approach has been formulated for the solution. The proposed approach has been applied for Indian 246-bus NREG system taking bilateral transactions into consideration over and above the pool transactions.
Effects of root extract of withania somnifera in 3- nitropropionic acid-induced cognitive dysfunction and oxidative damage in rats
P Kumar, A Kumar
International Journal of Health Research , 2008,
Abstract: Purpose: To investigate the possible modulatory role of root extract of Withania somnifera (WS) in 3-Nitroproiponic acid (3-NP)-induced cognitive impairment and altered level of oxidative defense in discrete areas of rat brain. Methods: 3-NP was administered in a dose of 10 mg/kg for 14 days where as WS root extract (100 and 200 mg/kg) was administered orally along with 3-NP. Cognitive dysfunctions were assessed in Morris water maze and plus-maze performance task paradigms. On 15th day the animals were scarified and reduced glutathione, total glutathione, oxidized glutathione (GSSG), glutathione-S-transferase (GST) and acetylcholinesterase enzyme levels were estimated in the striatum, cortex and hippocampus of the rat brian. Results: Chronic WS root extract (100, 200 mg/kg) treatment for a period of 14 days significantly improved 3-NP-induced cognitive impairment in Morris water and plus maze tests (p<0.05). Further, WS root extract treatment significantly restored GSH, total glutathione, oxidized glutathione, GST and attenuated acetylcholinesterase levels in striatum, cortex and hippocampus regions of brain. Conclusion: There is possible neuroprotective effect of WS root extract against a 3-NP- induced neurotoxicity in rats.
Prevalence of Ringing Delusion among Mobile Phone Users  [PDF]
Neeraj Kumar, Raees A. Khan
E-Health Telecommunication Systems and Networks (ETSN) , 2012, DOI: 10.4236/etsn.2012.14006
Abstract: The exponential application of mobile technology has led to a concern about implications of electromagnetic radiation on human health. As we are aware that mobile phone radiates EMR when users communicate to others and that time subscribers of the device are regularly exposed nearby 40% - 50% of total mobile irradiation. We analyzed the risk of \"Ringing Delusion\" among normal users, moderate users and heavy users when compared to low users. Although the \"Ringing Delusion\" has not been added in medical terminology but we found frequently such kind of symptoms among mobile phone users. \"Ringing Delusion\" may be considered as an imagination of ringing voice from cellular phone. The risk was also compared between urban and rural, male and female and adult and children population. The information was gathered through well designed questionnaires for cellular user’s demographic and social characteristics, adopted safety measures and calling duration. Prevalence of “Ringing Delusion” among rural users was higher than the urban users. A trend for the risk was also observed in male users in comparison to female. Study may support innovators to re-examine health effects of mobile phones.
Are there Monthly Variations in Water Quality in the Amman, Zarqa and Balqa Regions, Jordan?  [PDF]
Khaled A. Alqadi, Lalit Kumar
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2013, DOI: 10.4236/cweee.2013.22B005
Abstract: This study investigated the monthly variation of water quality in the Amman-Zarqa and Balqa regions in Jordan in terms of pH, ammonium, nitrate and conductivity. During 2004 there was no monthly variation in water quality for most of the tested parameters. All readings were above the accepted range except for pH, indicating that land use does have an impact on water quality irrespective of urban, industrial or agricultural usage. The water quality remained for the most part below the maximum levels for drinking standards in Jordan, but these standards are often below the WHO recommendations. The pH was found to fluctuate through the year. Nitrate levels were highly seasonal in irrigated lands but remained stable over basin covered by other land uses. Ammonium levels were high in areas of urbanisation and intensive animal husbandry as a consequence of effluent infiltration, peaking during the wet season due to increased infiltration. These results indicate that, over an annual cycle, the variation in water quality remains constant; however the continued drawdown of the aquifer system will inevitably lead to deterioration in the parameters investigated.
Tissue engineering - the promise of regenerative dentistry
A. Kumar
Biology and Medicine , 2011,
Abstract: The science of tissue engineering aims at the repair of damaged tissues as well as creates replacement of the lostones. This is becoming a major component of the regenerative medicine by combining the principles oftransplantation, materials science and bioengineering to restore a diseased or a damaged tissue to normal function.The earliest attempts at tissue replacement thousands of years back involved teeth and even in modern times,dentistry has continued to place considerable emphasis on the study and use of biocompatible materials. For most ofthe general dental practitioners restoration of lost tooth tissue, whether from disease or trauma, represents asignificant proportion of their daily routine. Considering the current prevalence of the dental diseases, it can be saidthat the challenge and resource burden of restoring lost tooth tissue will be with us for many years to come. Tissueengineering will have a considerable effect on dental practice during the next coming years. The greatest effects willlikely be related to the repair and replacement of mineralized tissues, the promotion of oral wound healing, correctionof craniofacial abnormalities, integration of biocompatible prosthetic implant materials with the oral tissues, theregeneration of dental hard and soft tissues and the use of gene transfer adjunctively. The purpose of this briefreview is to provide the general dental practitioner a background of tissue engineering, its accomplishments indentistry and its future promises to the profession in the form of regenerative dentistry.
Methods for screening ginger (Zingiber officinale Rosc.) for bacterial wilt resistance
Indian Phytopathology , 2012,
Abstract: Currently the bacterial wilt management depends on selection of disease free seed rhizomes, rhizome treatment by hot air or hot water or rhizome solarization, periodical roguing of infected plants and crop rotation with non-host plants to reduce the disease causing potential of soil. Though effective in disinfecting the ginger rhizomes from Ralstonia solanacearum, none of these strategies practically arrested the spread of disease in the field during peak monsoon season, which is highly congenial for horizontal disease spread across the region. Exploitation of host resistance for management of bacterial wilt can be one of the important ecofriendly disease control strategies. To locate resistance against bacterial wilt, a reliable screening procedure becomes vital. Three in vivo methods viz., pseudostem inoculation, soil inoculation, rhizome inoculation and a novel in vitro method i.e., direct incorporation of bacterial cells in the medium when the plantlets are 2-3 leaf stage were evaluated by using different concentration of bacterial cells. Among the different methods evaluated, pseudostem inoculation resulted in wilting of plants in 5-7 days, followed by the soil inoculation method in 7-10 days, rhizome inoculation method in 45-60 days and the in vitro method in 10-14 days. Interestingly, the in vitro method did not result in typical wilting of plants, where the inoculated plants showed only yellowing. One of the observations during the standardization was the occurrence of ‘disease escapes’ among the inoculated plants during the first round of screening, which succumb to disease upon repeated inoculation of pathogen. The PCR assay confirmed the absence of the pathogen in the soil around the uninfected plants, which necessitated the need for three rounds of inoculation for reliable screening for bacterial wilt resistance. Since the soil inoculation closely mimics the natural condition where disease occurs, it is recommended from this study for screening ginger for bacterial wilt resistance. Any surviving plants after three rounds of selection can be further validated through the in vitro method standardized in this work.
Repair of rheumatic mitral regurgitation in children
Kumar A
Annals of Pediatric Cardiology , 2011,
W.G.J. Remmelink, Emperor Pakubuwana II, Priyayi and company and the Chinese war [1726-1743]
A. Kumar
BMGN : Low Countries Historical Review , 1992,
The Sample Size
A Kumar
Journal of Universal College of Medical Sciences , 2014, DOI: 10.3126/jucms.v2i1.10493
Abstract: Finding an "appropriate sample size" has been the most basic and foremost problem; a research worker is always faced with, in all sampling based analytical researches. This is so, since a very large sized sample results to unnecessary wastage of resources, while a very small sized sample may affect adversely the accuracy of sample estimates and thus in turn losing the very efficacy of selected sampling plan. The present paper attempts to highlight the main determinant factors and the analytical approach towards estimation ofrequired sample size, along with a few illustrations. DOI: http://dx.doi.org/10.3126/jucms.v2i1.10493 ? Journal of Universal College of Medical Sciences (2014) Vol.2(1): 45-47
Knowledge and practice of mothers regarding breast feeding: a hospital based study
A Kumar
Health Renaissance , 2012, DOI: 10.3126/hren.v10i1.6015
Abstract: DOI: http://dx.doi.org/10.3126/hren.v10i1.6015 HREN 2012; 10(1): 73-74
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