Abstract The article presents for the first time synthesis of silver nanoparticles in an electric arc high-voltage alternating current with a frequency 50 Hz. In particular, method and apparatus necessary preparation water solution is discussed. Current–voltage characteristics depending on mutual distance between electrodes are presented which show very high stability generated discharge phenom...

Radiata pine is the main wood species used in Chilean construction industry, but it must be protected due to its low natural durability. Chemical protection of by impregnation allows for a more efficient utilization forest resources extending useful life. The use nanoparticles has garnered great interest during last decade, their unique physicochemical properties, different from those larger si...

This paper reports the first analytical approach carried out on two working palettes by Portuguese modernist master Almada Negreiros, found in 1991 behind old wood cabinets at DN building Lisbon. is only known occasion left color experiments done before starting to paint nearby walls and as such, it a unique opportunity analyze materials painting techniques that were originally used. The setup ...

The water quality of Owan river, a very important river in Ovia North-East Local Government Area Edo State, Nigeria was assessed. American Public Health Association (APHA) standard analytical procedures for and sediment samples were used. Elemental composition the determined by Energy Dispersive X-ray Fluorescence Spectrometer (EDXRF). Results obtained statistically analysed (basic descriptive)...

This paper presents the problem of soil pollution in vicinity a former chemical plant, given that production activity was stopped for more than thirty years ago. The old plant located southern part Braila town, SE Romania, just few kilometers from left bank Danube River. Prior to 1990, there significant industrial goods, such as sulfuric acid, carbon dioxide synthetic fibers, chlorine gas and h...

Breathing clean air is a human right still not accessible to everyone. In most of the world, polluted, which affects both environment and health. To investigate pollution situation in semi-rural part northern China, particles with diameter below 2.5 μm (PM2.5) were collected Changping, 40 km northwest Beijing May June 2016. The analyzed for mass, trace elements, black carbon (BC). mean PM2.5 ma...

In this work, we present the catalytic application of naturally occurring zeolite, clinoptilolite, in oxidation α-pinene, a natural terpene compound. Clinoptilolites with different average particle sizes, designated as (in μm) clin_1 (20), clin_2 (50), clin_3 (200), and clin_4 (500–1000), were used green catalysts solvent-free α-pinene oxygen. Prior to their tests, characterized by following me...