1,122 research outputs found

    Effect of Copper Oxide on Dielectric and Magnetic Properties of Substituted Sr-M Hexaferrite

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    Effect of CuO addition on the hexagoal ferrite (SrCo1.3Ti1.3Fe9.4O12-d) has been investigated. (Co-Ti-Sr)- M hexaferrite compositions were synthesized by sol-gel auto combustion method. Pure ferrite phase was achieved after cacination at 1200°C. However the addition of copper oxide resulted in decomposition of hexagonal ferrite phase into CoFe2O4 phase. In case of 1.5 weight % CuO added specimen, the material was composed of cobalt ferrite and CuO based phases. Densification study shows that bulk density increases with increase of CuO as well as grain size also increases. Permittivity of the ferrites increases with increase in CuO addition and it was highest in 1.5 weight% CuO containing sample. This is due to formation of cubic ferrite phase

    Performance Comparison of Different Speed Estimation Techniques in Sensorless Vector Controlled Induction Motor Drives

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    Field-oriented control and direct torque control are fast becoming necessities of modern industrial setups for induction motor drive control. Induction motors are considered as the beginning part to create any electrical drive system to be subsequently utilized for several industrial requirements. So now a day due to its high application the need to control the performance of the induction motor is gaining importance. In modern control system, IM is analyzed by different mathematical models mainly depending on its applications. Vector control method is suitably applied to induction machine in 3-phase symmetrical or in 2-phase unsymmetrical version. For vector control IM is realized as DC motor having its characteristics. This dissertation work is aimed to give a detailed idea about the speed control and variations in an induction motor through vector control technique thereby showing its advantage over the conventional scalar method of speed control. It also focusses on the speed estimation techniques for sensorless closed loop speed control of an IM relying on the direct field-oriented control technique. The study is completed through simulations with use of MATLAB/Simulink block sets allowing overall representation of the whole control system arrangement of the Induction motor. The performance of different sensorless schemes and comparison between them on several parameters like at low speed, high speed etc. is also provided emphasizing its advantages and disadvantages. The analysis has been carried out on the results obtained by simulations, where secondary effects introduced by the hardware implementations have not been considered. The simulations and the evaluations of different control techniques are executed using parameters of a 50 HP, 60 Hz induction motor which is fed by an inverter

    Inertio- and Elasto-Magnetic Fractionation of Multiple Microparticles in Newtonian and Non-Newtonian Fluid

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    Sorting of microparticles and cells using microfluidic platforms has several applications in diagnosis, biotechnology, and medicine. However, the currently available microfluidic sorting techniques have one or more of the following drawbacks such as low throughput, need for diluting sheath flows for operating devices, inability to sort multiple particles simultaneously, low purity and requirement of complicated fabrication methods. In this thesis, a hybrid scheme for sheath-less fractionation of microparticles has been devised by integrating magnetophoresis, inertial focusing and elastic focusing approaches with the concept of pinched flow fractionation. We have taken advantage of inertia, magnetic, drag, and elastic forces to achieve high throughput multiplexed microparticle fractionation. The technique has been tested with respect to parameters such as size of particles, flow rate, device geometry and fluid viscosity (Newtonian vs. non-Newtonian). This sorting method offers a tool to handle heterogeneous samples and can be used for affinity-based immune-magnetic separation of biological substances

    FXR AGONISTS INDUCE DISTINCT H-12 STRUCTURAL STATES

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    The nuclear receptor ligand-binding domain (LBD) is a highly dynamic entity. The FXR LBD shows multiple low-energy conformational states of the activation function-2 (AF-2) coregulator binding surface upon ligand binding, indicating the complexity of FXR activation. However, it is unknown how ligand binding leads to different conformational states within the AF-2 region centered on helix 12 (H-12) of the LBD. Here we observe the conformation of the coregulator binding surface (H-12 specifically) of FXR upon ligand binding in solution using fluorine-19 (19F) nuclear magnetic resonance (NMR) and simulations of this surface using molecular dynamics. Fluorescence anisotropy of fluorescein-labeled coregulator peptides reveals a correlation between structural conformations of the coregulator binding surface and the function of FXR. While the coregulator surface of apo FXR and partial-agonist bound FXR exchanges between multiple low energy conformations, full-agonist bound FXR is restricted to few conformations, which favor coactivator binding. Furthermore, we find that two ligands that induce similar affinities for a coactivator peptide have distinct coregulator binding surface structures

    Understanding social organisation and delivery of integration for NCDs programmes in Bihar, India: An institutional ethnography

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    In the health systems literature, integration has been proposed as a management strategy to increase access to services, improve patients’ satisfaction, enhance quality of care, reduce costs, and increase organizational efficiency. Empirical literature shows that availability of qualified and motivated staffs, drugs supply, and adequate infrastructure are key barriers for success of integrated programme low income setting. Understanding these barriers and related institutional process can bring new perspective and insight on integration. This dissertation examines the implementation of integrated NCDs and mental health programmes in Bihar from health workers’ standpoint. The study employs Institutional ethnography (IE) to guide this inquiry, a methodology that begins with the everyday experience of participants (health workers and managers in the integrated programmes) and then moves outwards to examine the social organization of programmes as they are implemented within the health system. Data collection was conducted in four sites in Bihar state (West Champaran, East Champaran, Vaishali, and Patna) and included 27 in-depth interviews with health workers and managers, 12 observations at three-district hospital and an analysis of 48 documents (guidelines, file notes, meeting notes and letters). Analytical writing, textual analysis and mapping were used as iterative and reflexive processes to map institutional relations in the integrated NCDs and mental health programmes. The study shows that integrated programmes are implemented in the decentralised health care context, where district administrators have limited authority. The analysis of institutional texts shows the principles of accountability, transparency and administrative govern institutional processes of staff recruitment and drug procurement and in turn, influence care pathways and service delivery. Some of integrated programme staffs were removed from the NCDs and mental health programmes and deployed in other priority programmes which negatively impacted NCDs and mental health service delivery at district hospital. Sometime staffs are forced to work in emergency ward without having proper skill and knowledge, which undermines the safety and quality of services. The study recommends that central government should give more autonomy to district authority to manage the institutional task of staff recruitment and drug procurement. The policy maker should develop human resource policy to provide better work condition to health workers working at the district hospital

    Electoral Reforms in India: Needs, Issues and Challenges

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    India’s freedom signalled the end of European imperialism and new start of rule of people in India through democratic principles, values and norms. Democracy, equality and fundamental rights became the core value of India’s constitution. Indian constitution accepted parliamentary democracy because freedom struggle has given experience of democratic value to Indians. Democracy believes in the people and their political rights. Parliamentary democracy has taken steps to protect the democratic principles, trust and values from structural flaws. In this regard, electoral process and electoral politics is the life and soul for consolidation of parliamentary democratic system in India. The free and fair elections are fundamental basis for success of democracy. Political stability can secure through people’s political participation. Electoral system is necessary and important instrument to make parliamentary democracy work. Under the constitutional values and guidelines of election commission free and fair elections are held at regular intervals in India. To make them from free of flaws it is essential to reform the electoral system from time to time. This paper evaluates need, issues and challenges for electoral reforms in India. Keywords: Parliamentary Democracy, Democratic principles, Political Participation, Election, Political Stability, Electoral Reform DOI: 10.7176/PPAR/10-9-03 Publication date:September 30th 202

    Hire the Experts: Combinatorial Auction Based Scheme for Experts Selection in E-Healthcare

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    During the last decade, scheduling the healthcare services (such as staffs and OTs) inside the hospitals have assumed a central role in healthcare. Recently, some works are addressed in the direction of hiring the expert consultants (mainly doctors) for the critical healthcare scenarios from outside of the medical unit, in both strategic and non-strategic settings under monetary and non-monetary perspectives. In this paper, we have tried to investigate the experts hiring problem with multiple patients and multiple experts; where each patient reports a preferred set of experts which is private information alongwith their private cost for consultancy. To the best of our knowledge, this is the first step in the direction of modeling the experts hiring problem in the combinatorial domain. In this paper, the combinatorial auction based scheme is proposed for hiring experts from outside of the hospitals to have expertise by the preferred doctors set to the patients.Comment: 7 Page
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