Transient Stability Enhancement of the Power System with Wind Generation

 Transient stability analysis of a power system with wind generation has been addressed in this paper. The effects of automatic voltage regulators, power system stabilizers, and static synchronous compensators on transient stability of a power system are investigated. Various simulation results show that addition of power system stabilizer and static synchronous compensators reduce the rotor angle oscillations. However, the static synchronous compensator shows better damping characteristics and improves the stability of the wind integrated system. It has been established that the static synchronous compensator damps out the speed oscillations in the shaft of the constant speed wind turbine. A transient impact index has been proposed to prove that the static compensator damps out the rotor oscillations

An Investigation on Strength of SS316L and Cobalt- Chromium used as cardio Vascular Stent materials by nonlinear FEA

Aim of this study is to provide a computational approach for evaluating the effect of Stents on biomechanical outcome of deployment of stent in different condition. Nonlinear FEA software has been used successfully on balloon expandable stents. Projects often require modelling systems that consist of multiple components with nonlinear materials, complex 3D geometries. The ABACUS, handles the full range of nonlinear material properties for the stent, the catheter balloon, and the artery wall. The objective of research carried out was to simulate the mechanical behaviour of the stent using finite element analysis. Implantation and in vivo loading are considered. Finite element analysis provides a quick and cost-effective method for evaluating stent performance, yielding accurate information about the expanded geometry and the stress and strain deformation fields with in the stent for various loading conditions. With appropriate applied internal pressure, the balloon inside the stent is deployed which linearlyexpands the diameter of a Modular Stent until it reaches 1.7 times of its original diameter. The results will assist in the development of novel stent designs and stent deployment to minimize vascular injury during stenting and reduce restenosis. The results obtained for the selected stent material are compared. The Cobalt-chromium undergone plastic deformation at 0.44 MPa and SS316L at 0.3 MPa pressure load

Sales Management Portal

The project deals with the tracking of the sales made on behalf of the projects that are being handled by the organization. In the current project, there exists three levels of user’s such as employee, manager and client. Each user with different levels of access will be having different features enabled to them. Apart from this the users will be having authorized access and each user will be checked for role based access at each page level so that only authorized user will be able to access the feature that are assigned to the user. The web application will be mobile compatible and will be developed using the C#.NET and MS SQL Server

Reassessing J. S. Mill's liberalism: The influence of Auguste Comte, Jeremy Bentham, and Wilhelm von Humboldt.

The thesis starts by considering the controversial claim made by Joseph Hamburger that couched within the arguments for freedom in On Liberty are calls for high levels of social control, which threaten the conventional reading of Mill as a paradigmatic liberal thinker. The thesis tests this argument against the claims of the revisionary secondary literature, which attempts to reconcile Mill's utilitarian and liberal writings. Examining Hamburger's main line of argumentation, the thesis shows how Mill's thought is more influenced by the thought of August Comte than Mill or the secondary literature acknowledge, while still retaining some crucial differences. The thesis next considers another influence argued to be outside of the liberal tradition, Jeremy Bentham. Even though Mill admittedly inherits utilitarianism from Bentham, he expands the psychological notion of pleasure in fundamental ways, even at the cost of internal consistency. Moreover, the thesis argues that Bentham utilises particular forms of social control in a similar manner as Comte, which is ultimately what Mill rejects in both of their doctrines. However at the same time, it is Comte's positivist philosophy of history that enables Mill to reconcile his utilitarian foundation with his liberal prescriptions. Next, the thesis argues that it is ultimately the influence the Wilhelm von Humboldt that maintains Mill's thought as recognizably liberal. Von Humboldt introduces the notion of individuality to Mill, whose expression is the highest source of pleasure, and is the concept that prevents Mill's moral and political system from collapsing back into a more Comtean and Benthamite formulation. Finally, synthesizing these influences, the thesis uses a hierarchical conception of the self, as articulated by Harry Frankfurt and Gerald Dworkin, to reconcile the high levels of social control correctly perceived by Hamburger with Mill's unambiguous protection and valuation of negative liberty. This socially embedded and highly normative conception of autonomy underpins Mill's progressive doctrine, and preserves his inclusion in the liberal tradition

Various nonlinear models and their identification, equalization and linearization

System identification is a pre-requisite to analysis of a dynamic system and design of an appropriate controller for improving its performance. The more accurate the mathematical model identified for a system, the more effective will be the controller designed for it. The identification of nonlinear systems is a topic which has received considerable attention over the last two decades. Generally speaking, when it is difficult to model practical systems by mathematical analysis method, system identification may be an efficient way to overcome the shortage of mechanism analysis method. The goal of the modeling is to find a simple and efficient model which is in accord with the practical system. In many cases, linear models are not suitable to present these systems and nonlinear models have to be considered. Since there are nonlinear effects in practical systems, e.g. harmonic generation, intermediation, desensitization, gain expansion and chaos, we can infer that most control systems are nonlinear. Nonlinear models are more widely used in practice, because most phenomena are nonlinear in nature. Indeed, for many dynamic systems the use of nonlinear models is often of great interest and generally characterizes adequately physical processes over their whole operating range. Thus, accuracy and performance of the control law increase significantly. Therefore, nonlinear system modeling is much more important than linear system identification. We will deal with various nonlinear models and their processing

Incidence of ventilator associated pneumonia and its risk factors

Hospitals are intended to heal the sick; but they are also sources of infection. Ironically, the advances in medicine are partly responsible for the fact that today; hospital infections are the leading cause of death worldwide. Newer technology and latest surgical and medical diagnostic methods and treatment procedures have increased the number of invasive techniques leading to higher chances of nosocomial infection. Pneumonia is the leading cause of death due to nosocomial infections. Intubation & mechanical ventilation greatly increases the risk for ventilator-associated pneumonia (VAP). In developing country like India, such hospital-acquired infections have a significant impact on patient’s morbidity, mortality, hospital stay and on financial concerns of the patient, hospital and community. The present investigation was aimed to determine the incidence of ventilator associated pneumonia in the neurosurgery intensive care unit of a tertiary care centre and to determine the risk factors of ventilator associated pneumonia. A total of 30 samples belonging to the age group of 15 to 75 years who where on mechanical ventilator for more than 48 hours in the neurosurgery intensive care unit of a tertiary care centre were selected using convenience sampling. The incidence of VAP was estimated to be 30%. The risk factors identified for the development of VAP was found to be combined head and cervical spine injury (P=0.001), associated injuries (P=0.035), additional surgeries (P=0.025), nasogastric feeding (P=0.001), intake of immuno suppressive drugs (P=0.004), pre operative antibiotics (p=0.000) and duration of mechanical ventilation >5 days (P=0.000). The mortality among patients with VAP was found to be higher than patients without VAP (88.9% than non VAP patients)

Comparative efficacy of behavioral despair models in depicting antidepressant-like effect of tramadol

Background: Experimental evaluation of antidepressants (ADs) in diverse animal models is the need of time. There is a constant search for newer models with ease and rapid screening of AD activity. As earlier studies highlight AD effect of tramadol in animal models, the study was undertaken to compare antidepressant-like effect of tramadol in two models of behavioural despair in mice.Methods: Tramadol was administered intraperitoneally (i.p.) at two different doses of 20 and 40 mg/kg, once daily for 7 days to Swiss albino mice. The immobility period of control and drug-treated mice was recorded in tail suspension test (TST) and forced swim test (FST). The antidepressant (AD) effect of tramadol was compared with control (NS) and reference drug imipramine (10 mg/kg, p.o.), administered orally (p.o.) for seven successive days.Results: Tramadol in tail suspension test (TST) produced significant antidepressant effect at 20 and 40 mg/kg doses, as depicted by reduction in immobility period of drug-treated mice compared to control group. The efficacy of tramadol at dose of 40 mg/kg was comparable to that of imipramine treated group (p0.05).Conclusion: The results of the present study depict antidepressant-like activity of tramadol in both the models of depression TST and FST. But TST in mice seems to be more efficacious in appraising the antidepressant like effect of tramadol

Tropical sprue in megaloblastic anemia

Background: The causes of megaloblastic anemia may vary in different geographical regions. The aim of the present study is to evaluate the utilization of bone marrow examination and upper gastrointestinal endoscopy (UGIE) in megaloblastic anemia.Methods: This was a cross-sectional descriptive study done on 50 patients (age ≥15years) of macrocytic anemia after applying inclusion and exclusion criteria. A bone marrow aspiration with biopsy and an UGIE with duodenal biopsy were performed in consented patients with evidence of megaloblastic anemia in the peripheral smear or Vitamin B12 deficiency or folate deficiency or both.Results: Out of 50 cases, 38 patients had pure Vitamin B12 deficiency, 2 patients had pure folate deficiency and 5 patients had combined deficiency. Among 43 patients with vitamin B12 deficiency, only four (9.3%) were vegetarians and remaining 39 (90.7%) were having non-vegetarian diet. Bone marrow study was done in 29 patients (out of 50) and all of them were found to have megaloblastic erythropoiesis in the bone marrow. Thirty three out of 50 consented for UGIE and duodenal biopsy. Out of 33, 17 patients (51.5%) had features of tropical sprue in biopsy.Conclusions: We found a high prevalence of tropical sprue in megaloblastic anemia due to Vitamin B12 and/or folate deficiency. We recommend that UGIE with deep duodenal biopsy should be considered in all patients with megaloblastic anemia to rule out tropical sprue in India