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These phases also can be formed when a potential imposed to the system causes the reduction of chalcopyrite, which allows the extraction of iron from the crystalline structure, forming copper sulfides that are more susceptible to oxidative leaching.
The final residues of bioleaching were analyzed by XRD (data not shown) and revealed the presence of chalcopyrite and the formation of jarosites, and no sulfur was detected.

Sinter the bricks at 1050˚C, 1100℃, 1150℃ and determined the porosity, water absorption and density, get data such as Table 2.
As the temperature increases apertures reduce, water absorption reduction.

Plants I Phragmites communis II Typha angustata III Arundo donax IV Canna generalis The experimental data are dealt with through the variance analysis of two-factor equilibrium of the randomized block with Excel-2003 software, and through multiple comparisons and analysis and significant difference test with Minitab software.
Results and discussion The soluble protein content variation between the experimental group and the control group are gotten of different wetland plants and different residence time of wastewater in the experiment (See: Table 2).Positive represents the amount of soluble protein content increases between two; negative sign for reduction.

Analysis of the data reveals that the film becomes well crystalline with increasing thickness in vacuum and the intensity along c-axis also increases due to reduction of oxygen vacancy.

Moreover, the ab-initio calculations require no empirical data and are very cost effective, which make large-scale material designs feasible and affordable.
This leads to a systematic reduction of energy and optical band gaps with increased atomic number of group IIIA substitutes.

For example, bulk gold is inert, however, isolated small particles (<10nm) have shown high catalytic activities for oxidation or reduction reactions [1, 2].
XPS analysis was performed after calcinations at 350 o C for 1 hour, Fig. 1(e) and the raw data was corrected using binding energy of C-1s peak at 285 eV.

Due to the distinct advantages, the demand for magnesium alloys has increased drastically for the past decade in the automotive industry where weight reduction becomes a key issue for the energy and environmental concerns.
A computer-equipped data logging system has been utilized to monitor the travelling distance and the injection pressure of the piston as well as the changes in the temperature of the slurry during high-pressure semi-solid casting process.

It is well known, that SnO2 sensors are sensitive to various reduction gases; generally, their main disadvantage is the poor selectivity.
The amount of both substances condensed, the RSn/Te value, and the thickness of the films were calculated from the crystal monitor data by means of computer programs using a method described elsewhere [5].

The AZ31 alloy billets were rolled from 10 mm to 2.5 mm in thickness by 10 passes at 703 K, and then were rolled down to 1 mm by 8 passes at 573 K with a total reduction of 90%.
The strain hardening exponent values (n-value) were obtained by power law regression of the tensile test data over the strain interval from about 1% to 8%.

The density of the samples were determined by liquid displacement method and the concentrations of the Cu2+ ions are determined by oxidation and reduction method [4].
At 4.2 K EPR data were recorded at Xband on a Varian E-122 spectrometer using an Air Products Helitran cryostat.