Piyush Kuchhal

Analytical study on the effect of dimension and position of slot for the designing of ultra wide band (UWB) microstrip antenna

This research paper presents a simple design consideration of Ultra-Wide Band (UWB) Microstrip antenna using a centrally loaded rectangular slot. An analytical study of the effects of different size and shapes of slots on the performance characteristic of UWB Microstrip antenna is presented. Insertion of slot and the changes in dimension of ground plane has a high impact on the behavior and parameter of the patch antenna. To improve the bandwidth of the patch antenna, proper insertion of slot on the planer patch structure has been used. In the paper 12mm by 15.6 mm rectangular patch antenna carved on FR4 substrate is presented. Both the simulated and the measured result show the operation of the antenna in the entire UWB range. This parametric study would be of a great interest in the designing of compact antennas for wireless communications operating in UWB.

Design of Broadband Monopole Microstrip Antenna Using Rectangular Slot

Microstrip antenna suffers from narrow bandwidth. The bandwidth would be enhanced by use of slot. Different sizes and shapes of slots on the patch are of great interest for obtaining optimum results in antenna design. A suitable dimension of the patch along with the position and dimension of the slot is critical in the broadening effect of the antenna. Present study proposed the method of a broadband microstrip patch antenna using slot. The slot used on the patch’s surface affects the radiation characteristics of microstrip patch antenna. This study also presents the choice of size and position of the slot for the broadband antenna. The simulations are conducted using HFSS and ADS, and results of the simulation studies are discussed in this paper.

Study of Rheological Properties of Industrial Lubricants

The most important rheological parameter for lubricants is viscosity as it also affects the tribological properties like friction between interacting surfaces and wear. This research intends to study the relationship between viscosity and temperature at different shear rates for multiple grades of three different categories of lubricants used for different applications viz. L1: MG20W50 (engine oil), L2: SAE20W50 (engine oil), L3: MC20W50 (mineral engine oil), L4: EP90 (gear oil), and L5: DXTIII (steering fluid). Constant high dynamic viscosity, shear stress, and low compressibility at different temperatures in multigrade as well as single grade industrial oil will help to maintain the surface film over the period of time and hence the reduction in wear. The dynamic viscosity of these chosen samples has been measured experimentally in temperature range of 20 to 50°C. The measurements have been extended to observe the dependence of shear rate, time, and temperature on the dynamic viscosity. All the samples are observed to behave like Newtonian fluids in the entire temperature range of study. Further, all samples seem to obey the Arrhenius relationship with temperature. Shear stress shows linear variation with shear rate exhibiting uniform viscosity which is substantiated by almost no variation in dynamic viscosity with shear rate for value above 5 per second.

AC and DC Conductivity Studies on Lead-Free Ceramics: Sr1–xCaxBi4Ti4O15(x = 0, 0.2, 0.4, 0.6, 0.8)

Sr1–xCaxBi4Ti4O15 [x = 0, 0.2, 0.4, 0.6, 0.8] ceramics are synthesized by solid-state reactive technique. Structural analyses are done by x-ray diffraction data. Morphological studies were carried out by scanning electron microscope, and the data showed plate-like structures. To understand the conductivity mechanism, frequency and temperature dependency of AC and DC conductivity studies are carried out. The conductivity measurements are done using an impedance analyzer (Wayn–Kerr) in the temperature range 100–600°C. The frequency-dependent AC conductivity at different temperatures indicates that the conduction process follows the universal power law, and the hopping frequency shifts toward higher frequency side with increase in temperature, below which the conductivity is frequency independent. The variation of DC conductivity confirms that the ceramics exhibit negative temperature coefficient of resistance behavior at high temperature. DC conductivity values do not show any linearity with doping concentration; for a particular composition SCBT06, the DC conductivity was low.

Network on Chip for 3D Mesh Structure with Enhanced Security Algorithm in HDL Environment

Network on chip (NOC) architecture is an approach to develop large and complex systems on a single chip. In this work 3D mesh topological structures has been implemented with enhanced TACIT Security in HDL environment. The architecture supports physical and architectural level design integration. Basic communication mechanism between resources is envisioned to be packet switched message passing through the switches. For the node identification in 3D networks 8 × 8 × 8 Mesh configuration is taken. A new Algorithm is proposed for secured data transmission among nodes. TACIT algorithm is used for data encryption and decryption and applicable for n bit block size and key. Design is implemented in Xilinx 14.2 VHDL software, and functional simulation was carried out in Modelsim 10.1 b, student edition. Hardware parameters such as size cost and timings are extracted from the design code. General Terms TACIT Security, Simulation, Synthesis, Integrated Circuits, Intellectual Property

Prediction Models for Global Solar Radiations, Diffused Radiations and Direct Solar Radiations Using ANFIS

In this study, the meteorological parameters of weather station of University of Petroleum and Energy Studies (UPES), Dehradun, India, has been considered for solar radiation prediction models based on adaptive neuro fuzzy inference system (ANFIS) have been proposed considering different inputs on daily basis for the year 2015. There are different metrological variables considered for solar energy prediction. To check the different suitable input parameters and different outputs like global radiation prediction, direct radiation prediction and diffused radiation, three models have been proposed in this paper.

Design and Experimental Evaluation of PSO and PID Controller based Wireless Room Heating System

The paper presents the control of 1kw heaters in 10*10*10 cubic feet room area through ZigBee remote. ZigBee Remote is capable to set the desired temperature command to the heater node by the user. Heater node is having dimmer, processing unit and ZigBee modem .The four temperature node is placed in appropriate location in the room and capable to communicate the temperature information to the heater node. Heater node sends the optimized room temperature data which is collected from the four sensor nodes, to the remote. Remote contains the optimized room temperature data and having the facility to feed the desired temperature data to heater node. This will be an intelligent network in which heater node intelligently maintains the room temperature as set by the remote, using PID and Particle Swarm Optimizing (PSO) algorithm on collected data and adjust the voltage levels of heating elements. Remote, heater node and sensor node having communication ability with baud rate of 9600. sensor nodes are capable to communicate upto 30 meters and remote and heater node is 100 meters. The proposed heater system is an intelligent, low cost and energy efficient. General Terms Embedded system, Control system, Communication, Optimizing algorithm

Rheology of Karanja (Pongamia) Oil Based Biolubricant

Rheology is the science of flow and deformation of liquids and semi-solid materials under the effect of an applied force. Rheological characterization of lubricating oils is important to predict their flow behaviour in each stage starting from preparation to processing up to application. Vegetable oils with high oleic acid content are considered the best candidate to substitute conventional mineral oil based lubricating oils and synthetic esters. The present article discusses the synthesis of biolubricant from non-edible Karanja oil in a two-stage transesterification process followed by reaction with branched neopentyl polyol to form polyol esters as the desired biolube product. The viscosity of synthesized biolubricant is measured at increasing temperatures using Rheometer model MCR302 by Anton Paar, Austria. The same apparatus was used for measuring shear stress, speed and torque. The study undertaken here intends to reveal relationship between viscosity and temperature, shear stress and shear rate; viscosity and shear rate and torque with shear rate of Karanja oil biolubricant. Variations in coefficient of viscosity with temperature, shear stress (τ) and shear rate (ϒ) are plotted accordingly. The synthesized biolubricant depicts Newtonian behaviour in hydrostatic regime.

Optimization of the dimension of circular slotted rectangular Microstrip antenna for wide band wireless applications

A stupendous growth in the area of Information technology is the spread of wireless wide band applications. The versatility of Microstrip patch antennas added new dimension to it. Its light weight and suitability for integration with microwave integrated circuits along with the simplicity of the structures marks it well suitable for low-cost manufacturing. All these accounts for the wide spread use of microstrip patch antennas in various wireless communication applications. In this paper a wide band rectangular shaped single-patch microstrip patch antenna with circular slot is proposed. Circular shaped slot over the rectangular patch is combined together to expand the bandwidth of the antenna. A compact size of 19 mm by 23 mm with duroid material is chosen for design. Optimization using HFSS simulation software is applied to optimize the structure of the antenna. The effect of circular slot is compared without the slot structure. It is observed that the bandwidth expands up to 0.7 GHz with a uniform radiation pattern.

Fuzzy logic-based real-time control for a twin-rotor MIMO system using GA-based optimization

Purpose The purpose of this paper is to study the application of entropy based optimized fuzzy logic control for a real-time non-linear system. Optimization of the fuzzy membership function (MF) is one of the most explored areas for performance improvement of the fuzzy logic controllers (FLC). Conversely, majority of previous works are motivated on choosing an optimized shape for the MF, while on the other hand the support of fuzzy set is not accounted. Design/methodology/approach The proposed investigation provides the optimal support for predefined MFs by using genetic algorithms-based optimization of fuzzy entropy-based objective function. Findings The experimental results obtained indicate an improvement in the performance of the controller which includes improvement in error indices, transient and steady-state parameters. The applicability of proposed algorithm has been verified through real-time control of the twin rotor multiple-input, multiple-output system (TRMS). Research limitations/implications The proposed algorithm has been used for the optimization of triangular sets, and can also be used for the optimization of other fussy sets, such as Gaussian, s-function, etc. Practical implications The proposed optimization can be combined with other algorithms which optimize the mathematical function (shape), and a potent optimization tool for designing of the FLC can be formulated. Originality/value This paper presents the application of a new optimized FLC which is tested for control of pitch and yaw angles in a TRMS. The performance of the proposed optimized FLC shows significant improvement when compared with standard references.