silicon thin layers are deposited on glass substrates with the thickness of 103 nm, 147 nm and 197 nm. the layers are produced with electron gun evaporation method under ultra-high vacuum condition. the optical reectance and the transmittance of produced layers were measured by using spectrophotometer. the optical functions such as, real and imaginary part of refractive index, real and imaginar...

purpose: to evaluate the effect of vacuum and flow rate on endothelial cell loss after high versus low vacuum phacoemulsification. methods: this randomized clinical trial was performed on 60 eyes of 60 patients with moderate lens opacity (nuclear sclerosis 3+). all surgeries were performed by one experienced surgeon using stop and chop technique with sovereign white star machine (amo). patients...

We propose that local Lorentz invariance is spontaneously violated at high energies, due to a nonvanishing vacuum expectation value of a vector field φμ, as a possible explanation of the observation of ultra-high energy cosmic rays with an energy above the GZK cutoff. Certain consequences of spontaneous breaking of Lorentz invariance in cosmology are discussed.

BACKGROUND Low back pain syndromes are one of the most frequent causes of movement limitation in populations of highly industrialized countries. They are listed as the main cause of inability to work among people of working age. Chronic pain and the associated limitation of movement underlie the quest for effective therapies. The use of ultrasound, LLLT, vacuum therapy with Ultra Reiz current i...

abstract background: we aimed to evaluate an approach to induced abortions during early pregnancies that controls the suction pressure and restricts the duration of the procedure. methods: three hundred patients programmed for induced early pregnancy abortions, hospitalized in the shandong provincial maternity & child care hospital from october 2013 to october 2015, were enrolled. patients were...

We demonstrate the superior performance of dielectric fluoride coatings versus oxide in long term vacuum operation a high power deep-ultraviolet enhancement cavity. In ultra-high (10 ?8 mbar), optics can maintain up to 10 W stable intracavity on one hour time scales, record-high at these levels, whereas for optics, we observe rapid degradation lower powers with rate that increases power. After ...

Isothermal molecular beam experiments on the methanol oxidation over stepped Au(332) surface were conducted under well-defined ultra-high vacuum conditions.

The so-called in-vacuum undulators, in which magnet arrays are installed inside the vacuum chamber, have been proved to be a promising way toward shorter wavelength of synchrotron radiation (SR). Especially, it has been adopted in lots of medium-scale SR facilities to provide angstrom x rays to carry out protein-crystallography experiments. Needless to say, there have been a number of technical...