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Search Results: 1 - 10 of 3490 matches for " Surendra Prasad "
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Transient Symptomatic Bilateral Optic Disc Oedema Following Lumbar Spinal Surgery— An Unusual Presentation  [PDF]
Vijaya Jojo, Surendra Prasad Jakhanwal
Open Journal of Ophthalmology (OJOph) , 2017, DOI: 10.4236/ojoph.2017.72017
Abstract: Background: Optic disc oedema has various underlying pathologies, however, unless visually disabling does not usually bring a patient to the physician. The more common symptoms of headache, nausea and vomiting lead to the incidental detection of bilateral disc oedema [1]. Optic disc oedema seen following spinal surgery is usually associated with visual acuity changes and often goes by the acronym POVL (Peri/ postoperative visual loss) wherein, as the name goes, visual acuity changes are profound [2] [3] [4]. Purpose: We would like to highlight a case of transient Bilateral Optic Disc oedema following Lumbar spinal surgery maintaining normal visual acuity and attaining spontaneous resolution. Case Report: A 42-year-old female presented with transient obscuration of vision and flashes of light post an uneventful lumbar spinal surgery. Ophthalmic evaluation revealed normal visual acuity and pupils but marked disc edema right more significant than left. There was no colour vision deficit, neither any field changes. By a process of exclusion, it was likely the patient had developed bilateral disc oedema secondary to the spinal surgery. On follow-up 6 weeks and 3 months later, the oedema had completely settled and visual acuity remained at 6/6. Conclusion: Optic disc oedema can be unilateral or bilateral with some of the uncommon conditions mentioned secondary to spinal surgery, however, in those situations, visual loss has been severe and permanent. Our case is unusual in its combination of disc edema with normal acuity along with its transient nature and resolution and to our knowledge, has not been published before.
Enhancement of Phase Matching Ability in One-Dimensional Photonic Crystal through Plasma Materials  [PDF]
Surendra Prasad, Vivek Singh, Abhay Kumar Singh
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.37041
Abstract: We have theoretically studied the modal dispersion equation and effective refractive index of one-dimensional plasma photonic crystals (1-D PPCs) having different materials in one unit cell. The dispersion relations related for such structure is derived by solving Maxwell’s equation using the transfer matrix method. It is found that the presence of plasma in a unit cell enhanced the phase matching ability and provides additional degree of freedom to control phase matching condition compared to the conventional one-dimensional photonic crystals (1-D PCs).
The Dispersion Characteristics of a One Dimensional Plasma Photonic Crystal Having Inhomogeneous Plasma Density Profiles  [PDF]
Surendra Prasad, Vivek Singh, A. K. Singh
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.223034
Abstract: The dispersion characteristics of binary 1D-PPCs having inhomogeneous plasma in the unit cell are studied. Using the transfer matrix method the required dispersion relations are obtained. Here the linear and exponential plasma density profiles are considered and compared with the homogeneous plasma having uniform density profile. It is observed that the inhomogeneity in plasma layer highly affect dispersion curves. By comparing the dispersion curves obtained in all considered cases, it is found that the widths of band gaps and phase velocities are always larger for exponential density profile than the linear uniform density profiles in the considered frequency range.
Nickel(II) Complexes of Hydrazone of Isoniazid and Their Magneto-Spectral, Electrochemical, Thermal and Antimicrobial Investigations
Surendra Prasad,Ram K. Agarwal
International Journal of Inorganic Chemistry , 2008, DOI: 10.1155/2008/350921
Abstract: The synthesis of novel nickel(II) complexes with new ligand derived from hydrazone of isoniazid has been reported. The complexes have general compositions [Ni(L)2X2] or [Ni(L)3](ClO4)2, where L = N-isonicotinamido-furfuraldimine (INH-FFL) and X=Cl? or NCS?. The ligand hydrazone behaves as neutral bidentate (N and O donor) through the carbonyl oxygen and azomethine nitrogen. On the basis of elemental analysis, molecular weight determinations, magnetic susceptibility/moment, thermogravimetric, electrochemical, and spectroscopic studies, the new complexes have been characterized with octahedral geometry. The antibacterial and antifungal studies of the present complexes show that they are moderate antibacterial and antifungal agents.
Synthesis, Spectroscopic and Physicochemical Characterization and Biological Activity of Co(II) and Ni(II) Coordination Compounds with 4-Aminoantipyrine Thiosemicarbazone
Ram K. Agarwal,Surendra Prasad
Bioinorganic Chemistry and Applications , 2005, DOI: 10.1155/bca.2005.271
Abstract: We describe the synthesis and characterization of cobalt(II) and nickel(II) coordination compounds of 4[N-(furan-2’-aldimine)amino]antipyrine thiosemicarbazone (FFAAPTS) and 4[N-(4'-nitrobenzalidene) amino]antipyrine thiosemicarbazone (4'-NO2BAAPTS). All the isolated compounds have the general composition MX2(L)(H2O) (M = Co2
Formulation and Quality Evaluation of Enriched Balanced Weaning Food at Low Cost
Bhim Prasad Pulami,Surendra Katawal
Journal of Food Science and Technology Nepal , 2010, DOI: 10.3126/jfstn.v6i0.8273
Abstract: Due to wide spread poverty, low income and non-availability of nutritious foods there are rampant of nutritional disorders such as protein energy malnutrition (PEM), anemia, vitamin-A deficiency, iodine deficiency disorder among preschool children in developing countries. Main purpose of the study is to formulate low cost supplementary weaning food from locally available raw materials. Based on the sensory evaluation, formula-I was preferred as a best sample (p<0.05). Chemical analysis of formula-I had been performed and found to be 2.02% moisture, 11.72% crude protein, 20.58% crude fat, 3.11% total ash, 2.69% crude fiber, 59.88% carbohydrate (by difference), 471 Kcal/100 g energy (calculated), 870.15 mg/100g vitamin A (acarotene; calculated), 11.86mg/100g iron, 275mg/100g calcium, 23.55mg/100g ascorbic acid, 35.6μg/100g iodine and 55% water absorbing capacity. The costing revealed the retail product price per kg as NRs. 71.20. J. Food Sci. Technol. Nepal, Vol. 6 (118-121), 2010 DOI: http://dx.doi.org/10.3126/jfstn.v6i0.8273
Dispersion Characteristics and Optimization of Reflectivity of Binary One Dimensional Plasma Photonic Crystal Having Linearly Graded Material
Surendra Prasad;Vivek Singh;Abhay Kumar Singh
PIER M , 2012, DOI: 10.2528/PIERM11101004
Abstract: The effect of graded permittivity profiles, filling factor and incident angles on the dispersion characteristics and reflectivity of binary one dimensional plasma photonic crystals having linearly graded dielectric materials are investigated by using the transfer matrix method. It is observed that position, width of band gap and high reflectance range can be improvised to desired level by proper choice of filling factor and graded permittivity index. The incident angle is found to affect the band gap and high reflectance range. Our analysis also shows that this plasma photonic crystal may be used for sensing applications.
To Control the Propagation Characteristic of One-Dimensional Plasma Photonic Crystal Using Exponentially Graded Dielectric Material
Surendra Prasad;Vivek Singh;Abhay Kumar Singh
PIER M , 2012, DOI: 10.2528/PIERM11090501
Abstract: The effect of exponentially graded material on the modal dispersion characteristics, group velocity and effective group index as well as phase index of refraction of a binary One-Dimensional Plasma Photonic Crystals (1D-PPCs) has been studied. The dispersion relation is derived by solving Maxwell's equations and using the transfer matrix method. The anomalous dispersion characteristics are observed for different values of selection parameters. The introduction of graded dielectric layers in 1D-PPCs provides additional parameters for controlling the propagation characteristics of 1D-PPCs. Also, the band gap is shown to become larger with the increase of plasma frequency and plasma width. Hence the structure having plasma and exponentially graded dielectric layer in unit cell is more useful for controlling and tuning of the plasma functioning devices than the structure having plasma and homogeneous dielectric layer in one unit cell.
Effect of Inhomogeneous Plasma Density on the Reflectivity in One Dimensional Plasma Photonic Crystal
Surendra Prasad;Vivek Singh;Abhay Kumar Singh
PIER M , 2011, DOI: 10.2528/PIERM11091702
Abstract: The dependence of reflectivity on inhomogeneous plasma density for one dimensional plasma photonic crystal is presented. The exponential varying and linear varying plasma density profiles have been chosen in such a way that the volume average permittivity remains constant. The transfer matrix method is used to derive the dispersion relation and reflectivity of the proposed structures by employing the continuity conditions of electric fields and its derivatives on the interface. The exponential varying plasma density profile gives high reflectivity than the linear varying plasma density profile in all considered cases. Also the exponential varying plasma density profile shows perfect reflection in considered volume average permittivity. This profile may be used in sensor applications or in plasma functional devices.
Iterative Receiver Based on SAGE Algorithm for Crosstalk Cancellation in Upstream Vectored VDSL
S. M. Zafaruddin,Shankar Prakriya,Surendra Prasad
ISRN Communications and Networking , 2011, DOI: 10.5402/2011/586574
Abstract:
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