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In near future, to provide global connectivity, there must be a global network. To do so, either we can deploy a full fledge new network which will be very costly or second option is, use the already deployed networks i.e. satellite and terrestrial networks in such a way that they can achieve the idea of global connectivity. Using satellite network it is difficult to provide connectivity for urban...
Researches on Wireless Sensor Networks (WSNs) have been increased tremendously in the recent years. Cluster-based Wireless Sensor Network out performs flat network in terms of data routing, energy dissipation, data load balancing, etc. A self organized cluster-based sensor network that has the cluster management mechanisms for new nodes joining and existing nodes leaving, is defined as Dynamic Cluster-Based...
The effective earth radius factor (k-factor) is an important parameter in the radio propagation and radio applications. In average atmospheric conditions, the four third (4/3) value of median k-factor is used for gross planning. However, it is important to use the actual predicted value determined from local meteorological data, whenever available. There is a lack of research work on variation of...
A power allocation algorithm for projection matrix receiver based MC-CDMA system named Adaptive Threshold SAFNAQ (AT-SAFNAQ), has been proposed. SAFNAQ is a combination of frequency domain (FDPA) and eigenvector based (EBPA) power allocation algorithms. SAFNAQ algorithm does not optimize threshold value and it uses same threshold value over different channel realizations. In AT-SAFNAQ, the receiver...
The use of wireless communication is not omissible in the present era. Nowadays, in most wireless systems multiband Circular Polarized antennas play an epochal role. Some of the notable applications that exercise multiband Circular Polarization are Global Positioning System (GPS), Satellite Communication, Radio Frequency Identification (RFID), WiMAX and HiperLan. Electromagnetic BandGap materials...
In this research work, the variation in the input impedance of Quadrifilar Helix Antenna (QHA) versus height of perfect conducting ground plane (PEC) is investigated. The results show that when the height of ground plane varies from 0.05λ to 1.0λ, maximum variations are observed in real part of input impedance below 0.3λ (44Ω to 50Ω in simulations and 41Ω to 52Ω in measurements). From 0.3λ to 1.0λ...
In this paper, a novel UHF radio frequency identification (RFID) tag antenna is presented for wireless sensor applications. The proposed meandered dipole loop antenna is designed on 0.25 mm thick paper substrate. The design is optimized for region specific UHF RFID bands used in Europe, North and South America and Japan. We have achieved a maximum gain of 1.8 dBi with a reduced tag dimension of 3...
The paper presents a frequency reconfigurable microstrip patch antenna printed on a textile substrate. It can be tuned by using active circuitry between Bluetooth and WiMAX operating at 2.4 GHz and 2.5 GHz frequency bands respectively. Indigo blue jeans having relative permittivity 1.68 with thickness 1 mm is used as a textile substrate. The frequency reconfiguration is achieved by switching the PIN...
The power generation from coal using conventional coal fired power plant is not environmental friendly and it becomes expensive when flue gas emissions are considered in the system. The alternate option is IGCC power plant which is environmentally benign compared to traditional pulverized coal-fired power plants, and economically feasible compared to the natural gas combine cycle (NGCC). In IGCC,...
Wind-tunnel experiments have been conducted on a blunt-slender body configuration at 0–60 deg angles of attack to examine the rolling oscillation. And the component effects on the motion of baseline model are also investigated including head strakes, strake wings and tail rudders. The results show that, with increasing of the angle of attack, the rolling oscillation of the baseline model can be divided...
The paper presents study of failure initiation and complex failure mechanisms in bolted joints for fiber reinforced composite laminates using two different progressive damage models simulated through combination of FEA package ABAQUS® and FORTRAN. Maximum stress failure criteria and Yamda-Sun failure criteria are used along with different (compatible) sudden material degradation rules for identification...
It is prerequisite to investigate the contact characteristics if enough simulation accuracy is needed for the prediction of the mechanical system, but the contact contributes the major deformations of the whole system and give rise to the discontinuity. This paper presented a method on how to model and simulate the contact process based on the finite element method. In order to explore contact performance...
In this paper, the problem is considered for stabilization and tracking control for discrete-time Lipschitz nonlinear systems. This study provides a methodology to deal with a general case of discrete-time nonlinear systems, which fulfill the Lipschitz nonlinearity condition. Due to the superior performance and extreme versatility of digital controllers, a discrete-time control approach is proposed...
In this paper an X-band textile antenna is proposed having bandwidth of 200 MHz; the anticipated antenna is probe-feed rectangular antenna, having slots to achieve desirable results. Antenna is simulated and optimized using software HFSS- High frequency structure simulator and then fabricated using jeans as substrate and copper tape for patch and ground having antenna size of 35x45x1 mm. Proposed...
In the recent past, malware have become a serious cyber security threat which has not only targeted individuals and organizations but has also threatened the cyber space of countries around the world. Amongst malware variants, trojans designed for data espionage and backdoor creation dominates the threat landscape. This necessitates an in depth study of these malware with the scope of extracting static...
In today's life Inertial Navigation System (INS) is the main source of finding the attitudes i.e. roll pitch and yaw of a flying object for navigation purposes. Due to the complexity and high cost of this system vision based navigation systems are introduced in this field for exact localization. In both systems rate of change of one function relative to other function is determined. A very sophisticated...
Traffic congestion is a growing problem in urban areas nowadays. In this paper, a system is developed to control and monitor the congestion of traffic. The main motivation is to detect the presence and absence of vehicles on the road using statistical approach integrated with conventional image processing techniques. For this purpose, we have develop a “Probability Based Vehicle Detection (PBVD)”...
A superfluorescent Erbium-doped fiber source (SEFS) in double-pass forward configuration incorporating a 90° cleave angle at 1550nm input-port of wave-division multiplexer (WDM) that acts as a Fresnel reflector, is presented. The output characteristics of the proposed configuration are analyzed. The experimental results of 90° cleave angle, no-reflector (8° cleave angle), and fiber loop mirror schemes...
For manufacturing of long life and sustainable materials, self-healing composites are an emerging concept. Mixing of resin with microcapsules containing healing agent is the best way to achieve this purpose. Curing of composites during thermal cycle leads to rise in temperature at core due to entrapment of heat of reaction and it may cause degradation of mixed capsules. In the present work thermal...
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