effects of surface contamination - on the infrared emissivity
For example, pure water absorbs very little visible light, but water is a strong infrared absorber and hence has a high absorptivity and high emissivity. 
Intro to Thermal RadiationOn the other hand, metals generally have low emissivities with aluminium foil and polished brass being examples of materials with the lowest emissivities. ??????????????????? ??????? 2007????? 19???????????. ??????????? 19?????????????????? ... ????????????????????? ????????????????Aston?1976?7????????????????????????????. ???????????????????????????????????? ... ? - World Bank Documents and Reports... ?????????????????????????????? ?? ???? ????. ????????????????????????? ?????????? ?????? 2 ????? ?????? 400,000 ?????? ?????????? ???. ?????????? 1 ? ?? ... ???????????????????. ? ?????????????????????. ? ??? ... ? ???????????????????(????. ??????)???? ... ???????????1 ?????????????????????????????????????????????????. ???????????????????????????????. ????? ... ????????TKE ?????????????????????????????????????? GlobalRouter ?????. ??CNI ????????????????????????? ... ?????????? ???? ??? ??????????7?45??8?30???15?. ??3??9??4,000????? ... ???????. ?. 9?. 20???. 23??. ?. 10?. 4?. ?. ?. ????????. Walking Course?????????????. ?????????????. ??????????? ... ?????? 2??????. ?????8 ??????. ????????????. ????????????????????? ????????? ?2??? ?????????. 19?10?. 19?21?. 19?36?. 19?48?. 1??. 2023? ?34?. ?????? ... ???? ????? - ??????3????????????4. ????????????????????????. ????????????????????????. ?????????? ... MAEBASHI WALKING MAP??????. ??. ????. ???. ??. ???????????. A. ?? ... ???. (ii. P. ???????????. ??????????: ???262 (???? ...
