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Search Results: 1 - 10 of 149589 matches for " H Biluts "
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Bladder Tumours at Tikur Anbessa Hospital in Ethiopia.
H Biluts, E Minas
East and Central African Journal of Surgery , 2011,
Abstract: Background: Bladder cancer is the fourth to fifth most common cancer in men, and the eighth in women These t umors are commonest in the 50 to 70 year age group The aim of this study was to review the pattern and surgical management of bladder tumors at TAS in Ethiopia. Methods: A hospital based retrospective cross sectional analysis was conducted in TASH, department of surgery, Addis Ababa, Ethiopia. Patients’ medical records and operation theater registers of 97 patients operated upon for bladder tumors, between January2006 and December 2008 were analyzed. Results: Sixty patients were male and 37 female (M: F of 1.6:1). Their age ranged from 20 to79 years, with mean age of 49.73±1.5.Duration of symptoms ranged between 1and 48 months (mean 13.9). The most common presenting symptoms were hematuria in 89(91.8%). cystoscopy and sonographic examination of the bladder were the main modalities of investigation in the diagnosis of bladder tumors in 100% and 96.9% patients respectively. Histopathologically, 87(89.7%) and 10(10.3%) patients had malignant and benign bladder tumors respectively. Of the patients with malignant bladder tumors, 78 (80.4%) had TCC, 5(5.2% SCC, and 3 (3.1%) adenocarcinoma. Common patterns of bladder masses were papillary 77(79.7%), sessile or mixed 10(10.3%), and nodular 6(6.2%).Upon presentation, 66(74.7%) of patients had lowgrade, whilst 20(23.0%) had high-grade disease, 85.5% of bladder tumors were nonmuscle invasive, while 14.9% were muscle invasive, and 2.4% metastatic. The commonest surgical technique employed for bladder tumor removal was TURBT in 80 (82.5%) patients. Forty-four (45%) of the patients had additional surgery such as repeated TURBT in 16(16.5%), cystectomy+ureterosigmoidostomy in 8(8.2%),radical cystectomy+neobladder in 5(5.2%), antiincontinence procedure in 4(4.1%),partial cystectomy in 4(4.1% ) and redo cystectomy+sigmoid bladder in 4( 4.1%). In 83(85.6%) patients the postoperative course was uneventful, while 17(17.5%) developed immediate postoperative complications. Twelve developed late complications. There were 6(6.2%) deaths. Post operative hospital stay of 1-70 days (mean 12.1) and a follow up period ranging from 1 to 26 month (mean 3.7 months) were also the outcome of this review. Conclusion: The most common type of bladder cancer in TASH is TCC.Bladder tumor is more frequent in men than in women. The commonest procedure for bladder tumors was TURBT (p<0.001) which is the golden standared for non-muscle invasive tumors.
Cerebral hydatidosis, a rare clinical entity in Ethiopian teaching hospitals: case series and literature review.
G Assefa, H Biluts, M Abebe, MH Birahanu
East and Central African Journal of Surgery , 2011,
Abstract: Background: Cerebral hydatidosis (CH) is a rare disease and unlike other body organs cerebral involvement is very uncommon and if it occurred it is often seen in pediatric patients. The aim of the study is to show the clinical and imaging features and neurosurgical outcome of CH in East African setup. Methods: Chart and imaging (MRI, CT, US) review of four intra-operatively proven cerebral hydatidosis, three pediartric and one adult, patients was made. Results: There were 3 pediatric cases between the age of 5 and 10 years, 2 female and 1 one male, and an adult, 29year, with cerebral hydatidosis. All of them presented with hemiparesis, nausea and vomiting and one of the pediatric patients presented in addition to the aforementioned with visual loss and seizure. All of the patients came from rural south Ethiopia (Arsi and Bale) except the adult patient but who used to live his childhood in same area came from an urban town (Dire Dawa), South East of the country. All had history of contact with pet animals (dogs). On imaging (CT and MRI) done with and without contrast there were solitary cerebral cysts with and without daughter cysts in each of the patients measuring between 6x5cm minimum and 11x11cm maximum. Two patients images showed post contrast rim enhancement with peri-lesional edema and likely to be infected cases, and the other two patients showed no enhancement and are likely to be non-infected. One of the pediatric patients had postoperative recurrence of hydatid and adjacent brain abscess and was re-operated and the cyst was removed and the abscess drained. All had uneventful postoperative recovery except one of the pediatric patient who had postoperative recurrence and brain abscess who had residual visual impairment and chronic seizure disorder. Conclusion: Extra cerebral Hydatidosis is endemic and common in rural Ethiopian and East African settings and therefore clinicians and in particular radiologists should be aware of cerebral hydatidosis, especially in a pediatric population, if imaging reveals spherical brain cysts.
Euler-Lagrange Elasticity: Differential Equations for Elasticity without Stress or Strain  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.17004
Abstract:

Differential equations to describe elasticity are derived without the use of stress or strain. The points within the body are the independent parameters instead of strain and surface forces replace stress tensors. These differential equations are a continuous analytical model that can then be solved using any of the standard techniques of differential equations. Although the equations do not require the definition stress or strain, these quantities can be calculated as dependent parameters. This approach to elasticity is simple, which avoids the need for multiple definitions of stress and strain, and provides a simple experimental procedure to find scalar representations of material properties in terms of the energy of deformation. The derived differential equations describe both infinitesimal and finite deformations.

Euler-Lagrange Elasticity with Dynamics  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.213138
Abstract: The equations of Euler-Lagrange elasticity describe elastic deformations without reference to stress or strain. These equations as previously published are applicable only to quasi-static deformations. This paper extends these equations to include time dependent deformations. To accomplish this, an appropriate Lagrangian is defined and an extrema of the integral of this Lagrangian over the original material volume and time is found. The result is a set of Euler equations for the dynamics of elastic materials without stress or strain, which are appropriate for both finite and infinitesimal deformations of both isotropic and anisotropic materials. Finally, the resulting equations are shown to be no more than Newton's Laws applied to each infinitesimal volume of the material.
Linear Algebra Provides a Basis for Elasticity without Stress or Strain  [PDF]
H. H. Hardy
Soft (Soft) , 2015, DOI: 10.4236/soft.2015.43003
Abstract: Linear algebra provides insights into the description of elasticity without stress or strain. Classical descriptions of elasticity usually begin with defining stress and strain and the constitutive equations of the material that relate these to each other. Elasticity without stress or strain begins with the positions of the points and the energy of deformation. The energy of deformation as a function of the positions of the points within the material provides the material properties for the model. A discrete or continuous model of the deformation can be constructed by minimizing the total energy of deformation. As presented, this approach is limited to hyper-elastic materials, but is appropriate for infinitesimal and finite deformations, isotropic and anisotropic materials, as well as quasi-static and dynamic responses.
Spectral resolution in hyperbolic orbifolds, quantum chaos, and cosmology
H. Then
Physics , 2007,
Abstract: We present a few subjects from physics that have one in common: the spectral resolution of the Laplacian.
Arithmetic quantum chaos of Maass waveforms
H. Then
Mathematics , 2003,
Abstract: We compute numerically eigenvalues and eigenfunctions of the quantum Hamiltonian that describes the quantum mechanics of a point particle moving freely in a particular three-dimensional hyperbolic space of finite volume and investigate the distribution of the eigenvalues.
Maass cusp forms for large eigenvalues
H. Then
Mathematics , 2003,
Abstract: We investigate the numerical computation of Maass cusp forms for the modular group corresponding to large eigenvalues. We present Fourier coefficients of two cusp forms whose eigenvalues exceed r=40000. These eigenvalues are the largest that have so far been found in the case of the modular group. They are larger than the 130millionth eigenvalue.
Static Electric-Spring and Nonlinear Oscillations  [PDF]
H. Sarafian
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.22011
Abstract: The author designed a family of nonlinear static electric-springs. The nonlinear oscillations of a massively charged particle under the influence of one such spring are studied. The equation of motion of the spring-mass system is highly nonlinear. Utilizing Mathematica [1] the equation of motion is solved numerically. The kinematics of the particle namely, its position, velocity and acceleration as a function of time, are displayed in three separate phase diagrams. Energy of the oscillator is analyzed. The nonlinear motion of the charged particle is set into an actual three-dimensional setting and animated for a comprehensive understanding.
First Principles Studies on the Electronic Structure and Band Structure of Paraelectric SrTiO3 by Different Approximations  [PDF]
H. Salehi
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.29111
Abstract: The electronic structure, energy band structure, total density of states (DOS) and electronic density of perovskite SrTiO3 in the cubic phase are calculated by the using full potential-linearized augmented plane wave (FP-LAPW) method in the framework density functional theory (DFT) with the generalized gradient approximation (GGA) by WIEN2k package. The calculated band structure shows a direct band gap of 2.5 eV at the Γ point in the Brillouin zone.The total DOS is compared with experimental x-ray photoemission spectra. From the DOS analysis, as well as charge-density studies, I have conclude that the bonding between Sr and TiO2 is mainly ionic and that the TiO2 entities bond covalently.The calculated band structure and density of state of SrTiO3 are in good agreement with theoretical and experimental results.
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