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Search Results: 1 - 10 of 223570 matches for " U. L. Makwana "
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Assessment of Available Transfer Capability for Congestion Management in Restructured Electrical Power Network for Competent Operation  [PDF]
U. L. Makwana, S. K. Joshi, Mehul D. Solanki
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24053
Abstract: Congestion is the prime cause of problems, due to open access of power system. The AC Power Transmission Congestion Distribution factor (PTCDF) is suitable for computing change in any line quantity for a change in MW bilateral transaction. The proposed PTCDF method is more accurate as compared to the DC power distribution factor. With PTCDF ATC can be calculated. After calculating ATC it is possible to know the valid multiple transaction on power system. With the help of ATC calculations congestion problem can be solved in restructured electrical power network. The paper presents the method for calculating ATC using PTCDF.
Enhancement of dissolution of Fenofibrate by Solid dispersion Technique
Tejas Patel,L. D Patel,Timir Patel,Sunil Makwana
International Journal of Research in Pharmaceutical Sciences , 2010,
Abstract: Fenofibrate is a lipid lowering drug used in the treatment of hyperlipidemia, which is not soluble in water and lower absorption in gastric fluid. In order to improve the solubility and oral absorption of the drug in gastric fluid and to enhance its dissolution rate solid dispersions and Lyophilization of dispersion is designed and evaluated. Solid dispersions of Fenofibrate were prepared using PEG 6000, Poloxamer 407 and a mixture of PEG 6000 and Poloxamer 407(1:1 mixture). The effect of melt and solvent methods of preparation of solid dispersion on dissolution behavior was also investigated. Dissolution studies indicated a significant increase in dissolution of Fenofibrate when dispersed in PEG6000 and Poloxamer 407. Physical mixtures containing PEG and Poloxamer 407 also showed improved dissolution of Fenofibrate as compared with that of pure drug, indicating the solubilizing effect of PEG6000 and Poloxamer 407. Solid dispersions containing Fenofibrate /Poloxamer 407, 1: 8, showed a 14-fold increase in dissolution after 60 min (D60) and another dispersion containing Fenofibrate /PEG 6000, 1:10, showed an 8-fold increase in the 0.1 N HCl systems. The dispersion containing six parts of the PEG 6000: Poloxamer 407 mixture (PEG 4000/PEG 6000, 1:1 mixture) showed a 12-fold increase in D60 as compared with pure drug. When multi-carrier solid dispersion containing six parts of mixture was prepared by the solvent method, the D60 value was about 2-fold that of the same dispersion prepared by the melt method. The dissolution of lyophilized solid dispersions further increased the dissolution of Fenofibrate significantly.
Are old running shoes detrimental to your feet? A pedobarographic study
Ulfin Rethnam, Nilesh Makwana
BMC Research Notes , 2011, DOI: 10.1186/1756-0500-4-307
Abstract: This was a prospective study involving 11 healthy female volunteers with no previous foot and ankle problems. New running shoes were provided to the participants. Plantar pressures were measured using the Novel Pedar system while walking with new and participants' personal old running shoes. Plantar pressures were measured in nine areas of the feet. Demographic data, age of old running shoes, Body Mass Index (BMI), peak pressures and pressure-time integral were acquired. The right and left feet were selected at random and assessed separately. Statistical analysis was done using the paired t test to compare measurements between old and new running shoes.The mean peak pressures were higher in new running shoes (330.5 ± 79.6 kiloPascals kPa) when compared to used old running shoes (304 ± 58.1 kPa) (p = 0.01). The pressure-time integral was significantly higher in the new running shoes (110 ± 28.3 kPa s) compared to used old running shoes (100.7 ± 24.0 kPa s) (p = 0.01).Plantar pressure measurements in general were higher in new running shoes. This could be due to the lack of flexibility in new running shoes. The risk of injury to the foot and ankle would appear to be higher if running shoes are changed frequently. We recommend breaking into new running shoes slowly using them for mild physical activity.Footwear characteristics have been implicated as a cause of foot pain [1]. Use of customised insoles was found to alleviate post work foot discomfort in healthy individuals whose jobs required long periods of standing and walking [2]. Ill fitting footwear has been associated with foot pain [3]. Individually fitted sport shoes were found to be effective in reducing the incidence of foot fatigue [4]. There is an association between using inappropriate footwear and injuries [5]. An association between injuries and the age of sport shoes has been reported [6]. The recommendations are that running shoes need to be changed every 500 - 700 kilometres as they lose their shock-ab
Unilateral blue sclera: A diagnostic enigma?
Makwana N,Jagannathan M
Indian Journal of Plastic Surgery , 2003,
Abstract:
OPTIMIZATION OF RESONANCE FREQUENCY OF CIRCULAR PATCH ANTENNA AT 5 GHZ USING PARTICLE SWARM OPTIMIZATION
Falguni Raval,Jagruti Makwana
International Journal of Advances in Engineering and Technology , 2011,
Abstract: The microstrip antenna is small in size, simpler and less expensive to manufacture. They are more compatible than reflector antennas with printed-circuit technology. The microstrip patch antenna is a type of antenna that is thin, and has easy manufacturability, which provides a great advantage over traditional antennas. The Particle Swarm Optimization (PSO) has been introduced to the electromagnetic community for few years. In this paper PSO has been used for optimization of resonant frequency of circular probe-fed patch antenna. The investigation is made at a microwave frequency of 5 GHz. This Optimization problem has two variables which are height of dielectric substrate (h) and radius of the circular patch (a). The PSO algorithm is developed using ‘Turbo C’.In order to verify the PSO algorithm, the Rosenbrock function is used as a performance test problem.
A Low Power High Bandwidth Four Quadrant Analog Multiplier in 32 NM CNFET Technology
Ishit Makwana,Vitrag Sheth
International Journal of VLSI Design & Communication Systems , 2012,
Abstract: Carbon Nanotube Field Effect Transistor (CNFET) is a promising new technology that overcomes several limitations of traditional silicon integrated circuit technology. In recent years, the potential of CNFET for analog circuit applications has been explored. This paper proposes a novel four quadrant analog multiplier design using CNFETs. The simulation based on 32nm CNFET technology shows that the proposed multiplier has very low harmonic distortion (<0.45%), large input range (±400mV), large bandwidth (~50GHz) and low power consumption (~247μW), while operating at a supply voltage of ±0.9V.
High-frequency homogenisation for hexagonal and honeycomb lattices
Mehul Makwana,Richard Craster
Physics , 2013,
Abstract: A high-frequency asymptotic scheme is generated that captures the motion of waves within discrete hexagonal and honeycomb lattices by creating continuum homogenised equations. The accuracy of these effective medium equations in describing the frequency-dependent anisotropy of the lattice structure is demonstrated. We then extend the general formulation by introducing line defects, often called armchair or zigzag line defects for honeycomb lattices such as graphene, into an otherwise perfect lattice creating surface waves which propagate in the direction of the defect and decay away from it. A quasi-one-dimensional multiple scale method is outlined, which allows us to derive Schroedinger equations describing the local oscillations near particular frequencies in the Bloch spectrum. Further localization by single defects embedded within the line defect are also considered.
A low power high bandwidth four quadrant analog multiplier in 32 nm CNFET technology
Ishit Makwana,Vitrag Sheth
Computer Science , 2012, DOI: 10.5121/vlsic.2012.3207
Abstract: Carbon Nanotube Field Effect Transistor (CNFET) is a promising new technology that overcomes several limitations of traditional silicon integrated circuit technology. In recent years, the potential of CNFET for analog circuit applications has been explored. This paper proposes a novel four quadrant analog multiplier design using CNFETs. The simulation based on 32nm CNFET technology shows that the proposed multiplier has very low harmonic distortion (<0.45%), large input range ({\pm}400mV), large bandwidth (~50GHz) and low power consumption (~247{\mu}W), while operating at a supply voltage of {\pm}0.9V.
Hilbert Transform Based Adaptive ECG R-Peak Detection Technique
Nikunj Hasmukhbhai Makwana,Nikunj Makwana,Nishant Mishra,Balwalli Sagar
International Journal of Electrical and Computer Engineering , 2012, DOI: 10.11591/ijece.v2i5.1439
Abstract: In this paper we introduce a R-peak detection algorithm using the Hilbert transform for electrocardiogram processing. This algorithm uses the envelope obtained from Hilbert transform to detect the R-peaks in the ECG signal. The algorithm adaptively determines the threshold for peak determination. This technique minimizes the unwanted effects of large peaked T and P waves. Main advantage of this algorithm is that it performs extremely well in the pragmatic presence of noise.
Ageing & Reaction time in Indian Population
Prafulla R Chandak,,Jayant Makwana
People's Journal of Scientific Research , 2012,
Abstract: The effect of advancing age & gender on visual and auditory reaction time was evaluated in 320 normal Indianmale & female volunteers in the age group of 21-60 years. The volunteers were divided in two groups according to age;Group A comprised of 200 volunteers (100 males & 100 females) in the age group of 21-45 years & Group B comprised of 120volunteers (60 males & 60 females) in age group of 46 – 60 years. The auditory & visual reaction time was recorded usingTechno Digital Response Time apparatus. Significant increase in visual reaction time and auditory reaction time wasobserved with the advancing age. In males, auditory reaction time increased by 22.6 msec & the visual reaction time forgreen & red light increased by 24.3 msec & 23.9 msec respectively from Group A to Group B. Similarly in females, theauditory reaction time lengthened by 24.4 msec while visual reaction time for green & red light increased by 28.6 msec &27.1 msec respectively. The auditory reaction time was shorter in females in both the age groups, while visual reaction timewas shorter in males in both the age groups. The results for change in auditory reaction time due to advancing age in malesas well as females were significant (p<0.05). While the results for the effect of ageing on visual reaction time for red as wellas the green light in males & females were significant(p <0.05).
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