Controlling the photoluminescence spectra of porous nc-Si–SiOx structures by vapor treatment

The effect of HF and H₂O₂ vapor treatment on the spectral composition and intensity of photoluminescence (PL) in porous oblique deposited nc-Si–SiOx structures have been studied using FTIR, electron-spin resonance (EPR) and PL measurements. As a result of HF vapor treatment, considerable PL intensity growth and blueshift of PL peak position are observed. It is suggested that the evolution of the PL spectra in HF vapor-treated samples can be attributed to selective-etching-induced decrease in Si nanoparticle dimensions and to passivation of Si dangling bonds (that are nonradiative recombination trap states) by hydrogen and oxygen. Additional treatment in H₂O₂ vapor results in additional nc-Si surface oxidation and reduction of nc-Si size. The possibility to control the PL characteristics (peak position and intensity) of the porous nc-Si–SiOx structures in a wide range by above treatments is shown

The COMPASS Experiment at CERN

The COMPASS experiment makes use of the CERN SPS high-intensitymuon and hadron beams for the investigation of the nucleon spin structure and the spectroscopy of hadrons. One or more outgoing particles are detected in coincidence with the incoming muon or hadron. A large polarized target inside a superconducting solenoid is used for the measurements with the muon beam. Outgoing particles are detected by a two-stage, large angle and large momentum range spectrometer. The setup is built using several types of tracking detectors, according to the expected incident rate, required space resolution and the solid angle to be covered. Particle identification is achieved using a RICH counter and both hadron and electromagnetic calorimeters. The setup has been successfully operated from 2002 onwards using a muon beam. Data with a hadron beam were also collected in 2004. This article describes the main features and performances of the spectrometer in 2004; a short summary of the 2006 upgrade is also given.Comment: 84 papes, 74 figure

The study of metal oxidation process when metal is exposed to waste products of farm animals

The article is devoted to the study of the corrosion process rate of steel parts in livestock and poultry buildings, primarily, dung removers, which are operated and exposed to a chemically aggressive environment. The issues of metal loss of parts which are in contact with waste products of cattle, pigs and poultry are considered. The results of the influence of corrosion processes on loosening torque increase of the threaded joints of dung removing equipment for livestock and poultry farms are also presented. The research results can be used in design and repairs of farm dung removers

Economic Sectors Development Evaluation in Innovations Triple-Helix Model

The paper relevance is related to the need to develop new approaches to the innovative economy management. The paper purpose is to develop innovative development analytical model in the economic sectors context based on open innovations' theoretical concepts study and systematization. The paper presents the characteristics for innovative activity system-forming elements, including the innovative infrastructure at the meso-level. An innovation triple helix model is suggested by economic activity types in national innovation systems on economic and mathematical simulation basis. The paper materials can be used to develop innovation activities forecasts of science, business and the state

Economic Sectors Development Evaluation in Innovations Triple-Helix Model

The paper relevance is related to the need to develop new approaches to the innovative economy management. The paper purpose is to develop innovative development analytical model in the economic sectors context based on open innovations' theoretical concepts study and systematization. The paper presents the characteristics for innovative activity system-forming elements, including the innovative infrastructure at the meso-level. An innovation triple helix model is suggested by economic activity types in national innovation systems on economic and mathematical simulation basis. The paper materials can be used to develop innovation activities forecasts of science, business and the state