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Search Results: 1 - 10 of 6052 matches for " Williams Kanishka "
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Functional outcome of corpectomy in cervical spondylotic myelopathy
Williams Kanishka,Paul Rajesh,Dewan Yashbir
Indian Journal of Orthopaedics , 2009,
Abstract: Background : Cervical spondylotic myelopathy (CSM) is serious consequence of cervical intervertebral disk degeneration. Morbidity ranges from chronic neck pain, radicular pain, headache, myelopathy leading to weakness, and impaired fine motor coordination to quadriparesis and/or sphincter dysfunction. Surgical treatment remains the mainstay of treatment once myelopathy develops. Compared to more conventional surgical techniques for spinal cord decompression, such as anterior cervical discectomy and fusion, laminectomy, and laminoplasty, patients treated with corpectomy have better neurological recovery, less axial neck pain, and lower incidences of postoperative loss of sagittal plane alignment. The objective of this study was to analyze the outcome of corpectomy in cervical spondylotic myelopathy, to assess their improvement of symptoms, and to highlight complications of the procedure. Materials and Methods: Twenty-four patients underwent cervical corpectomy for cervical spondylotic myelopathy during June 1999 to July 2005.The anterior approach was used. Each patient was graded according to the Nuricks Grade (1972) and the modified Japanese Orthopaedic Association (mJOA) Scale (1991), and the recovery rate was calculated. Results: Preoperative patients had a mean Nurick′s grade of 3.83, which was 1.67 postoperatively. Preoperative patients had a mean mJOA score of 9.67, whereas postoperatively it was 14.50. The mean recovery rate of patients postoperatively was 62.35% at a mean follow-up of 1 year (range, 8 months to 5 years).The complications included one case (4.17%) of radiculopathy, two cases (8.33%) of graft displacement, and two cases (8.33%) of screw back out/failure. Conclusions: Cervical corpectomy is a reliable and rewarding procedure for CSM, with functional improvement in most patients.
Critical groups of critical points produced by local linking with applications
Kanishka Perera
Abstract and Applied Analysis , 1998, DOI: 10.1155/s1085337598000657
Abstract: We prove the existence of nontrivial critical points with nontrivial critical groups for functionals with a local linking at 0. Applications to elliptic boundary value problems are given.
Homological local linking
Kanishka Perera
Abstract and Applied Analysis , 1998, DOI: 10.1155/s1085337598000505
Abstract: We generalize the notion of local linking to include certain cases where the functional does not have a local splitting near the origin. Applications to second-order Hamiltonian systems are given.
One-sided resonance for quasilinear problems with asymmetric nonlinearities
Kanishka Perera
Abstract and Applied Analysis , 2002, DOI: 10.1155/s1085337502203048
Abstract:
Resonance problems with respect to the Fucik spectrum of the p-Laplacian
Kanishka Perera
Electronic Journal of Differential Equations , 2002,
Abstract: We solve resonance problems with respect to the Fucik spectrum of the $p$-Laplacian using variational methods.
Multiple positive solutions for a class of quasilinear elliptic boundary-value problems
Kanishka Perera
Electronic Journal of Differential Equations , 2003,
Abstract: Using variational arguments we prove some nonexistence and multiplicity results for positive solutions of a class of elliptic boundary-value problems involving the p-Laplacian and a parameter.
A multiplicity result for the scalar field equation
Kanishka Perera
Mathematics , 2013,
Abstract: We prove the existence of $N - 1$ distinct pairs of nontrivial solutions of the scalar field equation in ${\mathbb R}^N$ under a slow decay condition on the potential near infinity, without any symmetry assumptions. Our result gives more solutions than the existing results in the literature when $N \ge 6$. When the ground state is the only positive solution, we also obtain the stronger result that at least $N - 1$ of the first $N$ minimax levels are critical, i.e., we locate our solutions on particular energy levels with variational characterizations. Finally we prove a symmetry breaking result when the potential is radial. To overcome the difficulties arising from the lack of compactness we use the concentration compactness principle of Lions, expressed as a suitable profile decomposition for critical sequences.
Study on Graphene Based Next Generation Flexible Photodetector for Optical Communication  [PDF]
Kanishka Majumder, Devesh Barshilia, Subimal Majee
Graphene (Graphene) , 2018, DOI: 10.4236/graphene.2018.72002
Abstract:
We report on the efficient photodetection (PD) properties of graphene based p-i-n photodetector, where all the three layers are either single or multilayer graphene sheets. We report the bandwidth and responsivity performance of the device. This simple structure paves the way for the next generation flexible wireless communication systems. A theoretical model is used to study the carrier distribution and current in a graphene based p-i-n photodetector system.
Sign-changing and multiple solutions for the -Laplacian
Siegfried Carl,Kanishka Perera
Abstract and Applied Analysis , 2002, DOI: 10.1155/s1085337502207010
Abstract: We obtain a positive solution, a negative solution, and a sign-changing solution for a class of p-Laplacian problems with jumping nonlinearities using variational and super-subsolution methods.
Semilinear elliptic equations having asymptotic limits at zero and infinity
Kanishka Perera,Martin Schechter
Abstract and Applied Analysis , 1999, DOI: 10.1155/s1085337599000159
Abstract: We obtain nontrivial solutions for semilinear elliptic boundary value problems having resonance both at zero and at infinity, when the nonlinear term has asymptotic limits.
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