area of the novel resonator in Figure 7 is 10 ϫ 7 mm 2 , where the corresponding resonator in an ordinary bias-T occupies an area of 10 ϫ 13 mm 2 , hence the size reduction is about 50%.
MEASUREMENTThe proposed resonators and the bias-T circuit shown in Figures 2 and 7, respectively were constructed and printed on RT/Duroid-6010.2 substrate with r ϭ 10.2 and thickness of 0.64 mm (Figs. 9 and 10). The S-parameters of the circuits were measured using a 8722D Agilent network analyzer. The results are shown in Figures 11 and 12, respectively. It can be seen that circuits perform as expected and the results are in good agreement with the simulated results.
CONCLUSIONS
Th i ss t u d yi n t r o d u c e sa n da n a l y z e st h eg e o t h e r ma le n e r g ya v a i l a b i l i t yi nNo n -a c t i v ev o l c a n i cr e g i o n . J e j ui s l a n di nKo r e ai ss i t u a t e di nn o n -a c t i v ev o l c a n i cr e g i o n . Th ei s l a n di sc o mp o s e do fr o c kwi t hh i g hp o r ea n d c l i n k e r , s c o r i ag e o l o g i c a l l a y e rf o r me db yv o l c a n i ca c t i v i t ya b o u tt womi l l i o na g o . Vo l c a n i cg e o l o g i c a l l a y e r swi t h p o r o u sc h a r a c t e r i s t i c sh a v ea i r , v a p o r , wa t e ra n dau n d e r g r o u n ds t r u c t u r et h r o u g hwh i c ha i ro rwa t e rc a nmo v e e a s i l y . F o rt h i sr e a s o n , i ti sp r o b a b l et h a tt h eme c h a n i s m o fe n e r g ya c q u i s i t i o ni sb yc o n v e c t i v eh e a tt r a n s f e r . F o r t h i sp r e s u mp t i o n , t h ea v a i l a b i l i t yo fu n d e r g r o u n da i ra se n e r g ys o u r c eh a sb e e ns t u d i e dh e r et h r o u g ht h e o r e t i c a l a n a l y s i sa n de x p e r i me n t a ld a t a . Th ee n e r g y o u t p u to fo u rs y s t e m r a n g e df r o m 2 , 4 8 5 , 0 7 6k J / d a y t o4 , 0 6 0 , 9 7 8 k J / d a ymo n i t o r e du s i n g v a r i a b l ev e l o c i t ya i rf l o w c o n t r o l l e r .Ou rs y s t e m h a sc a p a b i l i t yt ob ear e l i a b l ee n e r g y s o u r c ei r r e s p e c t i v eo fe n v i r o n me n t a l c h a n g e s . C o n s e q u e n t l y , u n d e r g r o u n da i rc a nb eu t i l i z e df o re n e r g ys o u r c ea n d p r o v i d et h eo p t i ma ld e s i g no fh e a t i n g / c o o l i n gs y s t e m.
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