نتایج جستجو برای: frequency standard

تعداد نتایج: 971975  

Journal: :Journal of Research of the National Bureau of Standards, Section D: Radio Propagation 1959

Natural regeneration ensures the survival of forest stands and sustainable forest development. The present study was conducted to investigate the natural regeneration of Persian oak (Quercus macranthera fisch. & C.A.Mey. Ex Hohen) stands in Arasbaran protected forest. Measurement of the frequency of standard and coppice regenerations was carried out in one-hectare square plots (100 × 100 m) in ...

Journal: :Transactions of the Society of Instrument and Control Engineers 1965

Journal: :IEEE Transactions on Instrumentation and Measurement 2001

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