No abstract

Two cryostats for vacuum ultraviolet spectroscopy are described, one for temperatures between 77 and 300 K, the other for a temperature of 4.2 K. They are designed so as to reduce to a minimum the rate of condensation of a solid contaminant film on to the cold samples from the residual vacuum of the system. At the lowest rate obtained, the absorption of L alpha radiation (121.6 nm) by the growing film increases by only 0.2% per hour. The nature of the contaminants is discussed.

No abstract

Advanced material such as composite material, metamaterial, nanomaterials and smart materials plays a significant role in degree of performance of any system as compared to conventional material and hence, they are commonly used in diverse applications such as aerospace, medical devices, sensor detection, smart solar application etc. Metamaterial is one of such artificial sub-wavelength materials to exhibit electromagnetic and optical properties that surpass or complement those accessible in nature. In this research paper, three structure of metamaterials are simulated for the solar application as an absorber to increase solar efficiency as well as to increase negative refractive index to represent wave propagation in different directions. From this study it can be concluded that all the three materials have reached maximum point of absorption in a narrow bandwidth and it is possible to obtain transverse magnetic wave if the materials are stacked. These materials can be used as frequency detector for THz applications.