Conditions for the delay-independent stabilization and the decay rate assignability of linear systems

In a previous paper (Amemiya 1983) two sufficient conditions were introduced for the delay-independent stabilization of linear systems by means of state-variable feedback including no delays.

In this paper the concept of delay-independently upper or lower bound of decaying rate assignability (DIUDA or DILDA) are introduced and it is proved that the two conditions previously obtained are necessary and sufficient condition for DIUDA and necessary condition for DILDA of linear systems by means of state-variable feedback including no delays. The conditions obtained are also applicable to systems including time-varying delays.     

Further condition for the delay-independent stabilization of linear systems

There are two different conditions for the delay-independent stabilization of linear systems by means of state variable feedback including no delays, one of which is also sufficient for decay rate assignability. In this paper a wider condition is presented for delay-independent stabilization. It is proved that this condition includes the conditions so far obtained     

Radiative Property of Absorbing Materials and its Collection Efficiency

Based on the previous research of the plate-type solar collector by the author, the analysis of the relationship between the spectral radiative property of the absorbing and transparent plates and their collector efficiency is firstly discussed on a simplified solar collector model. This analytical technique is then applied to evaluate the performance of water solar collector in practical use and the performance of five sorts of the commercial solar collectors are compared each other on both the collection efficiency and equilibrium temperature. Consequently, it is made clear that those solar collectors in Japan are of excellent quality of high collection efficiency.

Secondly, the performance of a unit-type air solar collector with carbon fiber sheet (CF-sheet) as the absorbing material, which was developed by the author in cooperation with a company, is analyzed and examined in the same way as above. Lastly, a large scale house-type air solar collector is tested, and this type of solar collector using carbon fiber' might be one of the most feasible methods to use solar energy in the industrial field including cost-performance.