ABSTRACT
We describe modulation responses and relative intensity noise (RIN) spectra of an InAs/GaAs quantum dot laser operating near 1300 nm. A very large nonlinear gain compression coefficient yields a highly damped modulation response with a maximum 3 dB bandwidth of ~6.5 GHz and flat RIN spectra which reach as low a level as -158/-160 dB/Hz at frequencies up to 10 GHz.
ABSTRACT
Influence of simulated microgravity on characteristics of rat bones was investigated by electron paramagnetic resonance (EPR). For simulation of microgravity condition the hanging of animal by tail was used. The main measurements were performed for diaphysis of femoral bones. The quantity of native radicals Rn, localized in an organic matrix, and carbonate radicals CO2-, localized on a surface of bioapatite nanocrystals, were determined. The decrease of CO2- radical quantity in bones of experimental animals have shown, that due to simulation of microgravity the decrease of "collagen-nanocrystals" interaction takes place. It is shown that the EPR method open possibilities to receive the unique information about bone demineralization processes at level of free radicals and nanoscale subsystems of bone tissue.
Subject(s)
Bone Demineralization, Pathologic/physiopathology , Bone and Bones/physiopathology , Free Radicals/analysis , Nanostructures/chemistry , Weightlessness Simulation , Animals , Anisotropy , Carbon Dioxide/analysis , Carbon Dioxide/chemistry , Collagen/chemistry , Diaphyses , Electron Spin Resonance Spectroscopy , Femur , Hindlimb Suspension , RatsABSTRACT
Sociologic survey of the knowledge of the population and medical workers about the new economical relations in public health system, including medical insurance, showed that both the population and medics understand the necessity of public health reformation, introduction of new economic relations, and medical insurance. The major part of the population is ready to pay for medical service, but cannot afford it.
