منابع مشابه
designing a fast locking pll
a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...
Modification and Use of an Electric Hygrometer for Estimating Relative Stomatal Apertures.
The need for measurement of stomatal apertures arises in many kinds of investigations, including studies of gas diffusion through stomates, physiology of stomatal control, and penetration of applied solutes into the leaf. Sometimes the measurements need to be made rapidly on many leaves or repeatedly on selected leaves without inflicting injury or seriously altering stomatal functions. iXiethod...
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SARS-CoV-2 is a highly transmissible respiratory virus causing COVID-19, a disease that has become pandemic. It is the biggest public health concern of this century. The sudden emergence of the novel SARS-CoV-2 has rapidly evolved into a pandemic that posed a serious threat to global health and economy Throughout the COVID-19 pandemic, solving immediate problems and preventing problems are two ...
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We describe a new laser-based hygrometer for ambient water vapor monitoring which uses a fiber-optic coupled, near-infrared diode laser in conjunction with high frequency wavelength modulation spectroscopy. The instrument operates unattended, uses little power, can be extremely compact, and exhibits high detection sensitivity. This instrument was flown on a KC-135 aircraft for a period of six m...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards
سال: 1955
ISSN: 0091-0635
DOI: 10.6028/jres.055.008