Electrical and Electronics

This paper focuses on the design of multi-element micro strip patch antenna array applicable to WLAN/MIMO at 2.4 GHz. Obviously, the performance of multi-element antenna system depends critically on the proper design of the arrays. In this paper design and simulation of 4x1 micro strip patch array with software IE3D is discussed. The performance of array have been compared with that of a single element micro strip patch antenna .Also the effect of mutual coupling of array elements on its performance is discussed .To reduce surface wave propagation, implementation of EBG substrate is discussed.

The main objective of Load Frequency Control (LFC) is to regulate the power output of electric generator within an area, in response to the changes in system frequency and tie-line loading. Thus, LFC helps in maintaining the scheduled system frequency and tie-line power interchange with other areas within the prescribed limits. Most LFCs are primarily composed of an integral and PID controller. The integrator gain is set to a level that compromises between fast transient recovery and low overshoot in the dynamic response of the overall system. This type of controller is slow and does not allow the controller designer to consider the possible changes in operating condition and non-linearity in the generator unit. Moreover, it lacks in robustness. FACTS are designed to overcome the limitations of present non-reheat thermal-thermal power systems and enhance the power system stability. One of the promising FACTS devices is the Thyristor controlled phase shifter (TCPS) to alleviate this difficulty. TCPS is connected in the tie-line to self-tune the parameters of integral and PID controller. Two area system, have been considered for simulationof the proposed TCPS connected integral and PID controller .The performance of the Conventional controller, TCPS connected Integral and PID controller have beenCompared through MATLAB Simulation. The qualitative and quantitative comparisonshave been carried out for Integral, PID controllers. The dynamic of performance responses of Integral and PID controller with TCPS shows that in terms of settling .Time, peak overshoot and steady state error are greatly improved than that of without TCPS.

In Networks-On-Chips, (NOC) global interconnection links and routers are the main sources of the power Consumption. In Application Specific NOC (ASNOC) power can be minimized by mapping the Processing Element (PE) on the custom topology rather than mapping on the standard topologies. In ASNOC, the design of the topology plays an important role in minimizing the power consumption. In this paper, we propose a custom topology generation algorithm using network partitioning, to reduce the power of the global interconnection links that connects the router to router. The proposed method is validated through a case study for benchmark video applications MPEG 4 decoder and PIP. The experimental case study shows 26.8% and 37.5% of power saving for the applications MPEG 4 decoder and PIP respectively compared to the existing algorithm. We also achieve 11.76% and 9 % of reduction in average number of hops for MPEG 4 decoder and PIP respectively.

This paper proposes a the common sharing distributed arithmetic method with less number of flip flops to reduce the power consumption by the circuit. To achieve the lesser number of Flip flops usage the registers used in the circuit to create latency will be replaced by buffers. By using the buffers in the circuit itself can create some latency efficiently than using the more number of flip flops in the circuit.

Development of a suitable lightweight system in which a sensor is airborne for carrying out surveillance. The sensor should remain airborne for a minimum of 2 minutes at a minimum height of 30 meter and above to do imaging of a proportionate area below. Recognizable real time video information should be transmitted to the ground receiver point suitably located in the observation area. Sensor should be able to detect man-sized objects in above-mentioned conditions. Proposed solution should take up design of configuration and identification of suitable options for sensor, data link, ground observation & control points and other support system(s). System configuration details comprising of sensor, data link, observation, data processing mechanism and support system should form part of the design. There are many approaches for motion detection in a continuous video stream. All of them are based on comparing of the current video frame with one from the previous frames or with something that we'll call background. The camera IC will provide high level functionality for all applications. This camera IC is controlled by microcontroller which is connected to it. The camera automatically focuses the object up to 50 m and is controlled by microcontroller.

In this paper, the laser beam welding is studied and Aluminum temperature field is gained in this process. The thermal effect of laser beam that specially depends on the laser type and temperature field of it in workpiece, is the main key of analysis and optimization of this process, from which the main goal of this paper has been defined. Utilizing laser as a method to join plastic components is growing in popularity. There are two laser welding mechanisms, keyhole mode and conduction mode. Keyhole welding is widely used because it produces welds with high aspect ratios and narrow heat affected zones. However keyhole welding can be unstable, as the keyhole oscillates and closes intermittently. This intermittent closure causes porosity due to gas entrapment. Conduction welding, on the other hand, is more stable since vaporisation is minimal and hence there is no further absorption below the surface of the material. Conduction welds are usually produced using low-power focused laser beams. This results in shallow welds with a low aspect ratio. In this work, high-power CO2 and YAG lasers have been used to produce laser conduction welds on 2mm and 3mm gauge AA5083 respectively by means of defocused beams. Full penetration butt-welds of and 3mm gauge AA508 using this process have been produced. It has been observed that in this regime the penetration depth increases initially up to a maximum and then decreases with increasing spot size.

Due to economic reasons arising out of deregulation and open market of electricity, modern day power systems are being operated closer to their stability limits. Maintaining voltage stability and specified voltage levels at all nodes in a large & heavily loaded Power network is a critical & challenging task for power engineers. A number of different approaches have been reported in papers for improvement of voltage stability. In this paper a method for improving voltage stability in a power network has been suggested based on Network Reconfiguration approach. Network Reconfiguration is intended to enhance the voltage stability by determination of switching options that maximizes voltage stability for a particular set of loads and is performed by altering the topological structure of the system. In this paper, reconfiguration of a power network is achieved by addition of new power lines to the existing network. The paper reports an application of ANNs in voltage stability enhancement. A generalized ANN model has been proposed for enhancement of voltage stability under varying load conditions. Training data sets for ANN training is generated by varying both real and reactive loads at the buses. An IEEE-14 Bus system considered to demonstrate the performance of the developed ANN model. The proposed ANN model is trained using conjugate Gradient Descent Back-propagation Algorithm and tested by applying arbitrary input data. The test results of the ANN model are found to be closely matching of the results obtained by off-line simulation.

The primary weapon used in modern air combat is a guided air to air missile. Many air to air missiles use proportional navigation (PN) guidance during the terminal phase. The main advantage of PN guidance is it requires minimal information regarding target motion. It is reliable and robust guidance scheme. The main objectives of this project are three fold 1) working of a guided missile, 2) PN guidance scheme and its suitability for air to air missiles. 3) Advantages and limitations of PN guidance. The above goals are met by implementing PN guidance law with the help of simplified interceptor and target missile models in MATLAB (SIMULINK). The effectiveness of PN guidance is also studied for various target engagement scenarios. Further this implementation has also been carried out in Xenomai – 2.6 (a Linux based open source Real Time Operating system) in C language.

In this paper, an improved model for complete observability of electrical power networks in optimal PMU placement is presented. Here a goal function is introduced based on the Integer Linear Programming (ILP) to find the optimal number and position for PMUs. Hitherto, modeling of zero injection busses constraints had been a challenge due to the intrinsic nonlinearity associated with it. We show that zero injection constraints can also be modeled as linear constraints. Also in this paper, a novel and topology based method is suggested when zero injection busses are considered in power grid. The ILP approach is implemented to solve the models. The models is tested in IEEE 14, 30, 57 and 118 busses systems. The simulation results are confirmed with the schemes concluded from authoritative publications.

Cryonics-raising the dead: The concept goes like this: When a patient’s heart stops beating, but before the structure of his brain starts to degenerate, the patient is attached to a heart –lung machine and progressively infused with ‘antifreeze’ and other cellular stabilizers and then his body temperature is lowered until the patient is at ‘liquid nitrogen temperatures’. At this point, all molecular change stops indefinitely and the patient are put in storage. When the nanotechnology cell repair devices become available, the fatal disease that caused ‘death is reversed, the anti-freeze toxicity is removed, and the patient is warmed back up alive and well. In cryonics- freezing people fore future – scientists take patients who have been labeled as ‘dead’ by current medical criteria, replace their blood and much of their body water with chemicals to inhibit freezing damage, and preserve them in liquid nitrogen at (-196 Celsius). At that temperature all molecules in the body are locked in solids can no longer move around to react. Thus the individual can remain unchanged for thousands of years. It is possible that frozen patients will repairable and relabeled as ‘potentially alive’ by using nannies