The test results show that the checkout limit is 0.12μg·g -1 (k=3), and the precision (RSD) is 4.6%, and the labeled rates of recovery ranges in 98～106%, and determination data of river system deposit standard samples GSD 5, GSD 6 are coincident with the recommended values.
The results showed that the hot corrosion of iron based alloys occurring in the experimental conditions was caused by liquid sulfate eutectics of Na_2SO_4-Fe_2(SO_4)_3 or Na_2SO_4-K_2SO_4-Fe_2(SO_4)_3. The corrosion behavior of the materials was dependent upon temperature, gas composition, alloying element content and deposit component.
Hot corrosion behavior of commercial iron, Fe-Cr and Fe-Al alloys in the presence of either a Na_2SO_4 or Na_2SO_4-K_2SO_4 deposit on their surfaces in oxygen-rich atmospheres containing SO_3at intermediate temperatures was studied.
The electrochemical mechanism of the process is indicated. The experimental results showed that controlling Pb in electrolyte as 40～120g/L,H 2SiF 6 as 90～120g/L, sodium wood sulfonate additive as 4g/L, high quality deposit Pb was obtained.
The amyloid deposits in the SP are the β-amyloid(Aβ)peptides-Aβ40 and Aβ42. The Aβ peptides are derived from the amyloid precursor protein(APP)which is considered very important for the AD pathogenesis.
SP 的淀粉样沉积物主要成份是 β- 淀粉样肽 A β 包括A β40和 A β42,由淀粉样前体蛋白 (am yloid precursor protein,APP)分解而来,被认为在 AD 的发病机制中起着十分重 要 的 作 用 。
The variables studied were transport of sand, underlying surface roughness, windblown sediment, wind-sand flow structure, soil mechanical composition and amount of wind erosion.
At a height of 0-20 cm, the height increased while the sediment discharge percent of sand flux decreased; there were significant differences in the sand flow formation under different land-use types.
4) The amounts of wind erosion and sand sediment were different among different land-use types.
Effect of forest vegetation on runoff and sediment production in sloping lands of Loess area
At the same time, better correlative relationship between runoff and sediment production and rainfall and rainfall intensity were testified by multiple regression, but the correlation decreased gradually with the increase of canopy density of forest.
Remanence magnetic records of the recent 130 000 years from the sediments in Nansha area, South China Sea
Two hundred and eighty-one samples, collected from drilling core NS93-5 located in the Nansha area of the South China Sea, were used to study the magnetic characteristics of the sediments in the sea.
Detailed rock magnetic results show that the magnetic minerals of the sediments were dominated by ferrimagnetic minerals such as magnetite, and a small contribution of hematite and maghematite also existed.
The sediments recorded three negative values of remanence magnetic inclination at the depth: 191-206 cm, 232-248 cm, and 292-308 cm.
may be the record of a Blake event in the sediments of the Nansha area.
The bank pays at an interest rate r for any deposit, and takes at a larger rate r' for any loan.
Electron probe microanalysis of the deposits showed a network structure that results from the surface defects of the cold rolled Ag substrate and the lattice mismatch between substrate and deposit.
In order to improve the utilization of light, the technologies of implantation of transition metal ions (V+ and Cr+) and electron beam irradiation to deposit noble metal particles (Ag and Pt) were used.
Afterwards, a new community, including regenerating and undying macro-organisms, lived continuously on a new deposit.
Effect of acetylene flow rate on morphology and structure of carbon nanotube thick films grown by thermal chemical vapor deposit