BEST COPY railL ' A . k , THE AF - RICAN RURAL LMPLt ' YMENT SRO
نویسنده
چکیده
Byerlee, Derek; Eicher, Carl K. Rural Employment, Migration, and Economic Development: Theoretical Issues and Empirical Evidence from Africa. Africa Rural Employment Paper No. 1. Michigan State Univ., East Lansing. Dept. of Agricultural Economics. Agency for International Development (Dept. of State), Washington, D.C. Sep 72 53p.; For related document, see PC 008 252 African Rural Employment Study, Department of Agricultural Economics, Michigan State University, East Lansing, Michigan 48823
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بررسی خواص اپتیکی شیشههای سیستم GeO2-PbO-CaO-SrO در حضور مقادیر مختلف از اکسیدهای کلسیم و استرانسیم
In the present study, the structural, optical and thermal behaviors of GeO2-PbO-CaO-SrO glasses were investigated to achieve the highest optical properties and thermal stability. Accordingly, different 50GeO2-(50-x)PbO-xCaO and 50GeO2-(50-x)PbO-xSrO (x=0, 10, 20) germanate glasses were prepared by the conventional melt and quench technique between two steel sheets. The produced samples were cha...
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