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Non-Newtonian Power-Law Fluid Flow and Heat Transfer over a Non-Linearly Stretching Surface  [PDF]
Kerehalli Vinayaka Prasad, Seetharaman Rajeswari Santhi, Pampanna Somanna Datti
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.35065
Abstract: The problem of magneto-hydrodynamic flow and heat transfer of an electrically conducting non-Newtonian power-law fluid past a non-linearly stretching surface in the presence of a transverse magnetic field is considered. The stretching velocity, the temperature and the transverse magnetic field are assumed to vary in a power-law with the distance from the origin. The flow is induced due to an infinite elastic sheet which is stretched in its own plane. The governing equations are reduced to non-linear ordinary differential equations by means of similarity transformations. These equations are then solved numerically by an implicit finite-difference scheme known as Keller-Box method. The numerical solution is found to be dependent on several governing parameters, including the magnetic field parameter, power-law index, velocity exponent parameter, temperature exponent parameter, Modified Prandtl number and heat source/sink parameter. A systematic study is carried out to illustrate the effects of these parameters on the fluid velocity and the temperature distribution in the boundary layer. The results for the local skin-friction coefficient and the local Nusselt number are tabulated and discussed. The results obtained reveal many interesting behaviors that warrant further study on the equations related to non-Newtonian fluid phenomena.
Indications and Outcome of Gynaecological Hysterectomy at Aminu Kano Teaching Hospital, Kano: A 5-Year Review  [PDF]
Zainab Datti Ahmed, Nafi’ah Taiwo
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.55043
Abstract:

Background: Hysterectomy, is a common operation worldwide. It is a major surgery, which leads to significant morbidity and mortality, hence, there must be a justifiable indication before the procedure is undertaken. Symptomatic uterine fibroid and utero-vaginal prolapse are common indications in this environment. Objectives: To determine the prevalence, indications and outcome of hysterectomy at Aminu Kano Teaching Hospital, Kano. Study Design: A retrospective study of all the hysterectomies that were done in Aminu Kano Teaching Hospital, Kano between 1st of Jan 2009 and 31st of Dec 2013. Result: During the period of study, there were 3843 major gynaecological operations. Out of which hysterectomy was 196, giving hysterectomy rate of 5.1% of all major gynaecological operations. Hysterectomy was highest among patient aged 40 - 49 years accounting for 54.6% of cases and the commonest indication was uterine fibroid, constituting 66.4% of all hysterectomies. Total abdominal hysterectomy was the most frequently preformed, accounting for 78.1% while, vaginal hysterectomy accounts for 20.9% of cases and subtotal hysterectomy was 1%. Hysterectomy was mostly complicated with post-operative pyrexia constituting 24% of all the complications while ureteric injury was the least, constituting 1%. There was no mortality recorded. Most of the patients who had hysterectomy were discharge in less than 10th post-operative day accounting for 91.3% of cases. However, 80.5% of patients who had vagina hysterectomy were discharge in less than 5th post-operative day. Conclusion: The prevalence of hysterectomy was 5.1%. Uterine fibroid was the commonest indication while post-operative pyrexia was the commonest complication found.

Feature Reduction for Intrusion Detection Using Linear Discriminant Analysis
Rupali Datti,Bhupendra verma
International Journal on Computer Science and Engineering , 2010,
Abstract: Intrusion detection is one of core technologies of computer security. It is required to protect the security of computer network systems. Most of existing IDs use all features in the network packet to look for known intrusive patterns. Some of these features are irrelevant or redundant. A well-defined feature extraction algorithm makes theclassification process more effective and efficient. The Feature extraction step aims at representing patterns in a feature space where the highest discrimination between legitimate and attack patterns is attained. The Classification step perform the intrusion detection task either by alerting if an observed pattern is described by an attack patterns model, usually called signature or misuse-based IDS, or by alerting if it is not described by a model of legitimate activity, usually called anomaly-based IDs.In this paper, Linear Discriminant Analysis algorithm is used to extraction of features fordetecting intrusions and Back Propagation Algorithm is used for classification of attacks. Tests are done on NSL-KDD dataset which is improved version of KDD-99 data set. Results showed that the proposed model gives better and robust representation as it is able to transform features resulting in great data reduction, time reduction and error reduction in detecting new attacks.
Misoprostol: An Effective Agent for Cervical Ripening and Labor Induction: A 2-Year Review in a Tertiary Center  [PDF]
Zainab Datti Ahmed, Ibrahim Garba, Taiwo Nafi’ah, Ibrahim Adamu Yakasai
Open Journal of Obstetrics and Gynecology (OJOG) , 2015, DOI: 10.4236/ojog.2015.55040
Abstract:

Background: Misoprostol a PGE1?analogue has increasingly been used for cervical ripening in preparation for induction of labour with variable outcome for both mother and baby. Objectives: To determine the effectiveness of Misoprostol in cervical ripening and labour outcome in Aminu Kano Teaching Hospital Kano. Study Design: A study of all patients who had cervical ripening for induction of labour using Misoprostol at AKTH Kano, Nigeria, between 1st Jan 2012-31st Dec 2013. Socio-demographic data of these patients including number of doses inserted before ripening is achieved, duration, course and outcome of labour were documented. Result: Four hundred and two women were admitted for cervical ripening. 365 women met the inclusion criteria out of the 358 folders retrieved, giving a retrieval rate of 98%. Despite this six folders did not contain enough information for the study and were excluded leaving us with a sample size of 352. They had a successful cervical ripening with an average of 2 insertions. Spontaneous onset of labour without further intervention was observed in 266 women (75.5%). However, 86 women (24.5%) were induced with oxytocin following cervical ripening. The mean duration of labour among those that had spontaneous onset of labour following Misoprostol insertion was 9.8 hours. 96% of the patients had vaginal delivery while 4% had Caesarean section. Conclusion: Misoprostol was associated with favorable outcome following cervical ripening with a low caesarean section rate.

On the Differential Equation $\frac{d}{dt}\left(\frac{\cos x}{1-\dot{x}}\right)\,=\,-\sin x$
P. S. Datti,B. R. Nagaraj
Mathematics , 2014,
Abstract: The autonomous differential equation in the title is derived in S.Srinivasan~\cite{ss05} (equation (E) in ~\cite{ss05}) in the context of certain discrete sums from the number theoretic considerations. These discrete sums are then estimated in terms of an integral involving the solutions of this differential equation; no analysis is done on this integral in ~\cite{ss05}. Our main objective is to consider this equation from the dynamical systems view point and describe all the orbits in the phase plane. The equation is singular in the sense that the coefficient of $\ddot{x}$ vanishes or becomes unbounded at a few points. This singularity puts a restriction on the initial data. The solutions that we obtain in explicit form are, however, smooth and satisfy the equation pointwise or in the limiting sense. The explicit form of solutions may also be used to analyse the integral in ~\cite{ss05}. The equation possesses an infinite number of equilibrium or critical points and there are periodic orbits surrounding each of them in a part of the phase plane. In the complement of this part of the phase plane, there are non-periodic orbits, any two of which have an infinite number of common points. This, however, is in great contrast with the fact that any two (distinct) orbits of a regular autonomous system are disjoint, thus bringing out the singular nature of the equation
Evidence that behavioral depression does not influence airway cell influx in allergic rats
Marcos A. Varriano,Ana A. Varriano,Fernanda Datti,Marcelo Datti,Edson Antunes,Nancy A. Teixeira
Mediators of Inflammation , 2001, DOI: 10.1080/09629350124118
Abstract: This study was designated to evaluate the influence of behavioral depression on the airway leukocyte recruitment in allergic animals. To achieve this, total and differential cell counts in bronchoalveolar (BAL) fluid of ovalbumin (OVA)-sensitized and depressed rats was evaluated. Inescapable electric footshock, applied on day 0, 7 and 13 after OVA sensitization, was used as a model to induce depression. In both non-depressed and depressed groups, the number of total and differential cells (eosinophils and mononuclear cells) in BAL fluid was significantly larger in sensitized compared with non-sensitized animals. However, no statistical differences were found between these groups with respect to the number of total and differential leukocytes,irrespective of the day inescapable shock was applied. Thus, behavioral depression does not influence the pattern of cell infiltration into the airways of allergen-induced airway inflammation.
The incidence of postoperative meningitis in neurosurgery: An institutional experience
Srinivas Dwarakanath,Veena Kumari H,Somanna Sampath,Bhagavatula Indiradevi
Neurology India , 2011,
Abstract: Introduction : Meningitis is the most dreaded cause of morbidity and mortality in neurosurgical patients. The reported incidence of postoperative meningitis is quite varied 0.5-8%. Material and Methods : The study cohort included all the patients who underwent neurosurgery at the department of neurosurgery, National Institute of Mental Health and Neurological Sciences, Bangalore, India over a period of seven years (2001 - 2007). Patients with culture positive meningitis were included for analysis. The incidence of postoperative meningitis was analyzed depending on the type of surgery performed and the microbiological profile of the organisms, and their sensitivity pattern. Results : Of the 18,092 patients who underwent neurosurgical procedures during the study period, 415 patients developed infection. The overall incidence of meningitis was 2.2%. The incidence of meningitis was high (7.7%) in patients who had a pre-existing infection like post-pyogenic meningitis or tuberculosis hydrocephalus. The procedure mainly performed in this subgroup was shunt. The most common organisms causing meningitis were non-lactose fermenting Gram-negative bacillus followed by Pseudomonas and Klebsiella species. The methicillin-resistant Staphylococcus aureus strains were isolated in 2.6% of the patients. Ninety-one strains were multi-drug resistant, among which four strains were resistant to all antibiotics tested. The overall mortality in patients with meningitis was 5%. Conclusion : Meningitis remains one of the most dreaded complications of neurosurgical procedures and is common in patients with preexisting infection. Gram-negative organisms are the most common causative pathogens of postoperative meningitis.
Interhemispheric epidermoids - An uncommon lesion in an uncommon location: A report of 15 cases
Bhat Dhananjaya,Devi B,Raghunath A,Somanna Sampath
Neurology India , 2011,
Abstract: Of the intracranial epidermoids, interhemispheric epidermoids are extremely rare and only about 19 cases have been reported. This is a retrospective study of 15 patients with interhemispheric epidermoids surgically treated over a 13-year period. The age at the time of presentation varied between 17 and 45 years and there were 9 males. The presenting feature was seizures (focal with secondary generalization) in 12 patients, hemiparesis in 5 and features of raised intracranial pressure in 3. On computerized tomography scan the lesions were hypodense in the interhemispheric region. On magnetic resonance imaging, the lesions were located in the interhemispheric region with heterogenous signal intensities. Restricted diffusion was evident on diffusion-weighted images and apparent diffusion co-efficient images. All the lesions were predominantly located in the anterior interhemispheric region, with either basal or parietal extension along the interhemispheric fissure. Eleven patients underwent frontal or fronto-parietal craniotomies, 3 underwent bifrontal craniotomies and 1 patient underwent supra-orbital craniotomy and endoscopic procedure. Total excision could be achieved in 11 patients; near-total, in 3; and partial excision, in 1 patient. Follow-up was available in 10 patients. Three patients had recurrence of lesion at 5 , 8 and 10 years, respectively.
Intraventricular ganglioglioma with bleed: A rare case report
Bhat Dhananjaya,Mahadevan Anita,Manish Ranjan,Sampath Somanna
Neurology India , 2010,
Abstract: Gangliogliomas are benign lesions that are predominantly temporal in location and present with chronic epilepsy. Intraventricular gangliogliomas are extremely rare and still rarer is intratumoral hemorrhage. Till date only 9 cases of lateral ventricular gangliogliomas have been reported. To the best of our knowledge only 1 case of intratumoral hemorrhage has been reported. We report a rare case of lateral ventricular ganglioglioma with intratumoral hemorrhage in a 27-year-old man.
Uterine Prolapse Following Fundal Pressure in the First Stage of Labour: A Case Report
J Tukur, AO Omale, H Abdullahi, Z Datti
Annals of African Medicine , 2007,
Abstract: The use of fundal pressure to assist a woman in labor is a controversial procedure. Its benefits are yet to be scientifically confirmed and it is associated with complications such as perineal lacerations, uterine rupture and uterine inversion. A case is reported of a 28year old Gravida 5 Para 4 + 0 (3 Alive) who presented to Aminu Kano Teaching Hospital, (AKTH) Kano, Nigeria with uterine prolapse following fundal pressure done in the first stage of labor in a peripheral hospital. She was delivered by Cesarean section and the prolapse successfully reduced under general anesthesia. Health workers need education on the risks associated with fundal pressure. Alternative methods of aiding women in labor should be promoted.
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