cu. mm.
1.chamber for X-ray and γ-ray dosimetry are here described: a) Ionization chamber of 0.5cm3 with pure graphite wall and alumunium collecting electrode. In case of radiation having a HVL between 0.07mm Cu to 2.5mm Cu corresponding to a X-ray tube voltage of about 60 to 220kV, the maximun error of. the energy response was below 1.5%.
2.A heavy metal-resistant bacteria strain named Bacillus thuringiensis subsp. cameroun 4AF1 was screened from 77 known Bacillus strains. The minimum inhibitory concentration (MIC) of 4AF1 to Co~(2+)、Ni~+、Cu~(2+)、Zn~(2+) were 277.2 mM, 109.4 mM, 124.0 mM, and 51.1 mM, respectively.
5.The Cu-Ni-Pt(group) ore reference materials with grain size of less than 0.074 mm were prepared by Raymond mill.
6.In the second group, there were Fe, Ti, Co, Ni, Cr, Pb, As, Cu, and Mn, which showed strikingly positive correlation with content of physical clay< 0.01mm in soils.
8.In this paper, the horizontal conticast is investigated to produce wire blanks of 0.06～0.1% Ag-Cu alloy. After stretched for 12 times, the wire blanks of φ15 mm become small I-sections which prossess an oxygen content of 45 ppm, an electric conductivity (IACS)>97%, a Brinell hardness (H_B) of 103～107, a yield strength (σ_C)≥460 N/mm~2,a softening temperature>280℃ and an elevated temperature (290℃) strength of 27～28 N/mm~2. This material is well suitable to be used in the transverter of the exciting dynamo.
9.Experiments shows that when melting temperature is 1450 ℃, casting mouldtemperature is 1250°C, casting velocity is 54mm/min and cooling distance is 10mm , Good 14mm wire of Cu-2.74 wt %Cr can be cast.
10.Under the low frequency electromagnetic field(electromagnetic frequency is 25 Hz and ampere turns is 12 800 AT), super-high strength Al-12%Zn-2.5%Mg-2.5%Cu-0.15%Zr alloy is semi-continuously cast into ingots which are 0.1 mm in diameter. The effects of casting temperature, casting speed and intensity of cooling water on microstructure are investigated.
