Engineering topics
Publications and source records attributed to Narayanan, S..
In this paper we focus on the network routing problem, and survey swarm intelligent approaches for its efficient solution, after a brief overview of power-aware routing schemes, which are important in the network examples outlined above.
Performance of direct methanol fuel cells with sputter-deposited Pt-Ru anodes was investigated.
Recent studies on direct methanol fuel cell (DMFC) technology has demonstrated that MEAs can be operated at low rates of airflow and moderate temperatures.
Explore the source record for details and available documents.
Explore the source record for details and available documents.
The design and operation of a methanol concentration sensor suitable for use with direct methanol fuel cells is described.
This paper summarizes some of the recent progress in the development of cells, stacks, and systems.
In this work, the effects of methanol crossover and airflow rates on the cathode potential of an operating direct methanol fuel cell are explored.
Direct methanol fuel cell based power systems are being developed as alternate power sources for portable applications under the sponsorship of DARPA.
Direct methanol fuel (DMFCs) have high potential for use in transportation applications because the fuel, unlike hydrogen, is relatively simple to generate, transport and store.
Explore the source record for details and available documents.
The progress in the development of the ambient temperature lithium-titanium disulfide rechargeable cell under development at the Jet Propulsion Laboratory is described in this paper.
The progress in the development of the ambient temperature lithium - titanium disulfide rechargeable cell under development at the Jet Propulsion Laboratory is described in this paper. Originally aimed at achieving a specific energy of 100 Wh/kg, 'AA' cells have demonstrated 125 Wh/kg at the C/3 discharge rate. The results of evaluating cell design parameters are discussed and cycling test data are also included in the paper. Safety tests results at various over-charge and over discharge conditions and rates proved to be uneventful. The test results of cell with built-in overcharge mechanism proved the concept was feasible. Replacing the lithium foil electrode with a Li(x)C resulted in a capacity at 1mA/cm(exp 2) of 200 mAh/gm and 235 mAh/gm at 0.167 mA.
A new liquid-feed direct methanol fuel cell using proton-exchange membrane electrolyte was developed at JPL under an ARPA-sponsored program.
Explore the source record for details and available documents.
Thin films of the 80 K-phase of BiCaSrCu-oxide superconductor having the composition of Bi2Ca1.05Sr2.1Cu2.19O(x) and high degree of crystalline perfection have been grown on c-axis oriented twin free single crystal substrates of NdGaO3. This has been achieved by carefully establishing the growth conditions of the LPE experiments. The temperature regime of 850 to 830 C and quenching of the specimens on the termination of the growth period are found to be pertinent for the growth of quasi-single crystalline superconducting BCSCO films on NdGaO3 substrates. The TEM analysis reveals a single crystalline nature of these films which exhibit 100 percent reflectivity in infrared regions at liquid nitrogen temperature.
An ongoing project in developing a Task-Level Robot Programming and Simulation System (TARPS) is discussed. The objective of this approach is to design a generic TARPS that can be used in a variety of applications. Many robotic applications require off-line programming, and a TARPS is very useful in such applications. Task level programming is object centered in that the user specifies tasks to be performed instead of robot paths. Graphics simulation provides greater flexibility and also avoids costly machine setup and possible damage. A TARPS has three major modules: world model, task planner and task simulator. The system architecture, design issues and some preliminary results are given.