Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

A novel diagnostic technique to detect the failure mode operating states of an air-breathing fuel cell used in fuel cell vehicles

Abstract: The world is at a cusp of major transition to fuel cell technology. Water management is of prime importance in air-breathing fuel cells (ABFCs). Inadequate water management leads to the dehydration or flooding which affects the performance of fuel cell. The paper addresses the issues of water management in ABFC by a novel method. Understanding of flooding and dehydration states is presented through experimental investigations. Experiments are conducted at various operating conditions to identify dehydration, normal or flooding states using easily measurable parameters like cell temperature, voltage and current. Preliminarily, by considering iR drop as a distinguishing parameter, dehydration and flooding operating states are distinguished.

New Double Fault Tolerant Full Adder Design for Real-Time Applications

Abstract: Using VLSI more number of transistors can be embedded on a single chip. As the space between transistors or circuits decreasing the system or chip is more susceptible to faults. Fault tolerant systems required to avoid inaccurate results. Full adder is basic building block for addition of multi bit numbers. The existing structure proposed is unable to detect fault in sum for some combinations. The proposed design can detect concurrent faults in both sum and carry. And also the proposed structure can repair the faults itself. This self repairing full adder structure can detect and repair the single and multiple faults. The proposed structure gives 100% error recovery. The circuit is simulated using Cadence tool and verified the functionality.

Ultra high speed full adder for biomedical applications

Abstract: In the field of bio medical engineering high performance CPU for digital signal processing plays a significant role Frequency efficient circuit is a paramount requirement for the portable digital devices employing various digital processors In this work a novel high speed one-bit 10T full adder with complemented output was described The circuit was constructed with XOR gates which were built using two CMOS transistors The XOR gate was constructed using 2T multiplexer circuit style It was observed that power consumption of the designed circuit at 180nm with supply voltage 18V is 1836 uW and delay was 1809 ps whereas power consumption at 90nm with supply voltage 12V is 2574 uW and delay was 8245 ps The observed Power Delay Product (PDP) in 180nm (at supply voltage 18V) is 033 and in 90nm (at supply voltage 12V) is 0212 The work was extended by implementing a 32-bit Ripple Carry Adder (RCA) and was found that the delay at 180nm is 937ps and at 90nm is 198ps The results were drawn at 180nm and also 90nm technology using CAD tool The results say that the present work offered significant enhancement in speed and PDP compared with existing designs

Heat Transfer Enhancement with Different Nanofluids in Heat Exchanger by CFD

Abstract: Nanofluids play a prominent role in heat transfer applications. The thermophysical phenomenon is additionally necessary for these fluids. Many researchers’ have been measured these fluids, in terms of preparation, stability and thermal properties. Most of the industries measure mistreatment of different types of heat exchangers. In order to interchange this drawback, we tend to square measure mistreatments completely for different coolants like water with ethylene glycol, nanofluid, and hybrid nanofluid. These fluids have high thermophysical properties. The design and modeling of a double pipe heat exchanger is finished by creo 2.0 and temperature distribution, heat transfer constant is simulated by ANSYS Fluent.