منابع مشابه
Power quality performance of energy-efficient low-wattage LED lamps
Light-emitting Diode (LED) lamps are more versatile and energy efficient compared with conventional light sources. This paper investigates two main problems related to power quality, namely, the harmonic generation from LED lamps and the effect of voltage sags on LED lamps. Laboratory tests on various LED lamps are conducted and the electrical characteristics of LED lamps are tapped under diffe...
متن کاملLaser-Cooled Mercury Ion Frequency Standard
A stable and accurate frequency standard based on the 40.5 GHz ground-state hyperfine transition in 199Hg1 ions is described. The ions are confined in a cryogenic linear Paul (rf ) trap and laser cooled to form a linear crystal. With seven ions and a Ramsey interrogation time of 100 s, the fractional frequency stability is 3.3 s2d 3 10213t21y2 for measurement times t , 2 h. The ground-state hyp...
متن کاملWater-cooled Heat Load Chopper for High-energy Synchrotron Experiments
FIGURE 2. Traditional X-ray scattering experiment setup. Photo Credit: Argonne National Laboratory. In addition to the setup shown in Figure 2, time resolution at BioCARS is provided by precise synchronization of additional beam blocking equipment placed before the sample under test—two rotating disk choppers and a shutter [2]. The X-ray beam is intercepted by a watercooled heat load chopper wh...
متن کاملPreventing mercury vapor release from broken fluorescent lamps during shipping.
Fluorescent lamps are estimated to annually release 1 t of mercury into the air in the United States; transport of used lamps may play an important role in these emissions. In 1999, the U.S. Environmental Protection Agency added lamps to the universal waste rule to encourage recycling by allowing shipment to recycling facilities by common carrier. The rules required that lamp packaging must be ...
متن کاملWavelengths of spectral lines in mercury pencil lamps.
The wavelengths of 19 spectral lines in the region 253-579 nm emitted by Hg pencil-type lamps were measured by Fourier-transform spectroscopy. Precise calibration of the spectra was obtained with wavelengths of (198)Hg as external standards. Our recommended values should be useful aswavelength-calibration standards for moderate-resolution spectrometers at an uncertainty level of 0.0001 nm.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
سال: 1942
ISSN: 0019-2341,1349-838X,2185-1506
DOI: 10.2150/jieij1917.26.2_9