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Search Results: 1 - 10 of 140367 matches for " Ashok K Nigam "
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Non-invasive interactive neurostimulation (InterX ?) reduces acute pain in patients following total knee replacement surgery: a randomised, controlled trial
Ashok K Nigam, Drena M Taylor, Zulia Valeyeva
Journal of Orthopaedic Surgery and Research , 2011, DOI: 10.1186/1749-799x-6-45
Abstract: A clinical trial under the Hywel Dda Clinical Audit Committee to validate the clinical benefit of Non-invasive Interactive Neurostimulation (NIN) therapy using the InterX device was performed in patients undergoing TKR. 61 patients were randomised to treatment groups in blocks of two from the Theatre Operation List. The control group received the standard hospital course of pain medication and rehabilitation twice daily for 3 post-op days. The experimental group received 8 sessions of NIN therapy over 3 post-op days in addition to the standard course received by the Control group. Pain and range of motion were collected as the primary study measures.Sixty one subjects were enrolled and randomised, but 2 subjects (one/group) were excluded due to missing data at Baseline/Final; one subject in the InterX group was excluded due to pre-existing rheumatoid pain conditions confounding the analysis.The experimental group pre- to post-session Verbal Rating Scale for pain (VRS) showed that NIN therapy consistently reduced the pain scores by a mean of 2.3 points (SE 0.11). The NIN pre-treatment score at Final was used for the primary ANCOVA comparison, demonstrating a significantly greater cumulative treatment effect of a mean 2.2 (SE 0.49) points pain reduction (p = 0.002). Control subjects only experienced a mean 0.34 (SE 0.49) point decrease in pain. Ninety degrees ROM was required to discharge the patient and this was attained as an average despite the greater Baseline deficit in the InterX group. Eight control patients and three experimental patients did not achieve this ROM.The results clearly demonstrated the clinical benefit of NIN therapy as a supplement to the standard rehabilitation protocol. The subjects receiving InterX fared significantly better clinically. Within a relatively short 3-day period of time, patients in the experimental group obtained the necessary ROM for discharge and did it experiencing lower levels of pain than those in the control group.Adequate
On Summability of Fourier Series
H. K. Nigam,Ajay Sharma
International Journal of Mathematics and Mathematical Sciences , 2009, DOI: 10.1155/2009/989865
Abstract: A new theorem on (,,)(,1) summability of Fourier series has been established.
A Study on Degree of Approximation by Summability Means of the Fourier-Laguerre Expansion
H. K. Nigam,Ajay Sharma
International Journal of Mathematics and Mathematical Sciences , 2010, DOI: 10.1155/2010/351016
Abstract: A very new theorem on the degree of approximation of the generating function by means of its Fourier-Laguerre series at the frontier point is obtained. 1. Introduction Let be an infinite series with the sequence of its th partial sums . If then we say that is summable by means (see the study by Hardy [1]), and it is written as , where is the sequence of th partial sums of the series . The Fourier-Laguerre expansion of a function is given by where and denotes the th Laguerre polynomial of order , defined by generating function and existence of integral (1.3) is presumed. We write Gupta [2] estimated the order of the function by Cesàro means of series (1.2) at the point after replacing the continuity condition in Szeg?’s theorem [3] by a much lighter condition. He established the following theorem. Theorem 1.1. If then provided that , with being the th Cesàro mean of order . Denoting the harmonic means by , Singh [4] estimated the order of function by harmonic means of series (1.2) at point by weaker conditions than those of Theorem 1.1. He proved the following theorem. Theorem 1.2. For provided that is a fixed positive constant, 2. Main Theorem The objects of present paper are as follows:(1)We prove our theorem for means which is entirely different from and harmonic means.(2)We employ a condition which is weaker than condition (1.9) of Theorem 1.2.(3)In our theorem the range of is increased to , which is more useful for application. In fact, we establish the following theorem. Theorem 2.1. If then the degree of approximation of Fourier-Laguerre expansion (1.2) at the point by means is given by provided that is a fixed positive constant and , where is a positive monotonic increasing function of such that as . 3. Lemmas Lemma 3.1 (see the study by Szeg?, 1959, [3, page 175]). Let be arbitrary and real, let and be fixed positive constants, and let Then 4. Proof of the Main Theorem Since therefore, Now, Using orthogonal property of Laguerre’s polynomial and (1.5), we have Using orthogonal property and condition (3.2) (taking for and for ) of Lemma 3.1, we get Further, using orthogonal property and condition (3.1) (taking for , 1 for , and for ) of Lemma 3.1, we get Now, since Therefore, By (4.7) and (4.9), we have, Thus, Now, we consider Finally, Combining (4.4), (4.5), (4.11), (4.12), and (4.13), we get This completes the proof of the theorem.
On Double Summability of Double Conjugate Fourier Series
H. K. Nigam,Kusum Sharma
International Journal of Mathematics and Mathematical Sciences , 2012, DOI: 10.1155/2012/104592
Abstract: For the first time, a theorem on double matrix summability of double conjugate Fourier series is established.
Comparative Study of Various Techniques on Outlier Detection
K, Varma Mamta and Rajesh Nigam
International Journal of Electronics Communication and Computer Engineering , 2011,
Abstract: Diverse patterns from web data, commonly referred to as web outliers or exceptional cases or noise; exist in many real-world databases. Detection of such outliers is important for numerous applications, such as detecting criminal activities in E-commerce. Outliers are data objects with different characteristics compared to other data objects. Formal definition of outliers is given by D.Hawkins. as “An Outlier is an observation that deviates so much from other observations so that it arouses suspicion that it is generated by a different mechanism”. Detection of such outliers (outlier mining) is important for numerous applications, such as detecting criminal activities in E-commerce, video surveillance, weather prediction, intrusion detection and pharmaceutical research. This paper has focus on comparative study of various techniques on Outlier Detection.
Magnetoresistance in granular CrO2 : influence of crystallographic and magnetic microstructure
A. Bajpai,A. K. Nigam
Physics , 2005,
Abstract: We report magnetotransport measurements on high purity sintered samples of spintronic CrO2 in an unexplored crystallographic regime between 5-300 K. The negative magnetoresistance (MR) as derived from RH isotherms is observed to be unhysteretic up to temperatures as high as 200 K. Between 240-290 K, RH isotherms exhibit some unusual features including a positive MR and strong pinning effects. These feature disappear above 290 K and is apparently related with the antiferromagnetic ordering of the insulating grain boundary. Qualitatively similar features with significantly enhanced MR are also observed when the GB density is increased. These results bring out the role played by the magnetic and crystallographic microstructure on the magnitude, sign and hysteresis of the magnetoresistance in this technologically important material.
Observation of fluctuation induced tunneling conductance in polycrystalline CrO2
A. Bajpai,A. K. Nigam
Physics , 2005,
Abstract: Intergranular conduction in half metallic CrO2 is known to occur through a combination of spin dependent tunneling (driven by Coulomb Blockade (CB) effects) together with certain spin independent (SI) hopping processes. We present evidence that in polycrystalline CrO2 with enhanced grain size, both these process (CB effect and SI Hopping) are suppressed and the functional form of conductance is best described by Fluctuation Induced Tunneling (FIT) in a wide temperature range. Similar features are observed when grain boundary density is increased by Cr2O3 or Cr2O5.The spin dependent tunneling driven by FIT results in the observation of significant enhancement and monotonic temperature dependence of magnetoresistance. Overall, the magnetotransport measurements in a thus far unexplored crystallographic regime of CrO2 reveal that the functional form of conductance strongly influences its magnetoresistive properties.
Critical exponents and the correlation length in the charge exchange manganite spin glass Eu_{0.5}Ba_{0.5}MnO_{3}
Sunil Nair,A. K. Nigam
Physics , 2005, DOI: 10.1103/PhysRevB.75.214415
Abstract: The critical regime of the charge exchange (CE) manganite spin glass Eu_{0.5}Ba_{0.5}MnO_{3} is investigated using linear and non linear magnetic susceptibility and the divergence of the third ordered susceptibility (chi{_3}) signifying the onset of a conventional freezing transition is experimentally demonstrated. The divergence in chi{_3}, dynamical scaling of the linear susceptibility and relevant scaling equations are used to determine the critical exponents associated with this freezing transition, the values of which match well with the 3D Ising universality class. Magnetic field dependence of the spin glass response function is used to estimate the spin correlation length which is seen to be larger than the charge/orbital correlation length reported in this system.
Microwave Synthesis, Characterization and Photocatalytic Properties of SnO2 Nanoparticles  [PDF]
Ashok K. Singh, Umesh T. Nakate
Advances in Nanoparticles (ANP) , 2013, DOI: 10.4236/anp.2013.21012
Abstract:

In the present endeavour, SnO2 nanoparticles (NPs) were synthesized using microwave method. Synthesized SnO2 NPs were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrscopy (EDS) to find their structure, morphology and elemental composition. SnO2 NPs were of spherical morphology having crystallite size of 35.42 nm as obtained from Scherrer’s formula using most intense peak of XRD. Synthesized NPs were used for photodegradation of melthylene blue (MB) dye under UV light. The SnO2 NPs ware found to have photodegradation efficiency and apparent rate constant of 55.97% and 2.149 × 10_2 respectively.


Growth, Yield and Water Use Effeciency of Forage Sorghum as Affected by Npk Fertilizer and Deficit Irrigation  [PDF]
Mohamed M. Hussein, Ashok K. Alva
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513225
Abstract:

Drought stress (DS) is an important limiting factor for crop growth and production in some regions of the world. Limitation in water availability precludes optimal irrigation in some production regions. Therefore, investigations on the interaction of other factors to mitigate the DS to varying degree are important. Two field experiments were conducted in the experimental farm of the National Research Centre, Shalakan, Kalubia Governorate, Egypt, during 2004 and 2005 summer seasons to evaluate the interactions between N, P, K rates and optimal vs. deficit irrigation regimes on biomass yield as well as water use efficiency (WUE) of forage sorghum. Omission of the 4th irrigation significantly decreased the biomass of sorghum c.v. Pioneer, as compared to that of the plants receiving optimal irrigation or subject to omission of the 2nd irrigation. The biomass yield increased with an increase in NPK fertilizer rates. Plant height and leaf area also decreased by omitting the 2nd irrigation as compared to that of the plants under optimal irrigation, and further declined with omission of the 4th irrigation. The biomass of the plants (dry weight basis) that received the high N, P, K rates was greater by 26%, 29%, and 35% as compared to that of the plants that received no N, P, K fertilizers, under optimal irrigation, omission of the 2nd, and omission of the 4th irrigation, respectively. The corresponding increases in water use efficiency (based on fresh weight yield) were 37%, 42%, and 55%.

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