Advanced Materials Research Vols. 418-420

Abstract: This paper investigates an H∞ robust controller for improving the measurement accuracy of the Optical Voltage Transducer with noise and parameter uncertainty. Firstly, the optical voltage transducer based on closed-loop detection is analyzed, and the model of the system is established concerning noise and uncertainty. Secondly, according to the model, this paper is theoretically devoted to the study of the Robust control for meeting the design target, while guarantees that the closed-loop system is asymptotically stable. Furthermore, we give a design criterion in terms of linear matrix inequality for the Robust control in the presence of noise and uncertainty. Finally, the experimental results demonstrate the effectiveness and feasibility of the robust controller.

Abstract: In this article we successfully prepared calamine / sodium alginate viscose fiber. Good dispersion and stability of the modified solution was prepared by dispersing calamine in alkaline solution of sodium alginate, and then mixed it with viscose spinning solution by spinning injection methods. Moreover, the stability of calamine / sodium alginate solution, the effect of concentration of calamine on the fiber properties is studied in this paper. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and physical mechanical performance are test to characterize the structure and the performance of the calamine / sodium alginate viscose fiber.

Abstract: In order to bring on the producing of low & ultra-low sulfur steel and optimal control of refining slag composition and property converter tapping, slag oxidability and oxygen activity have been analyzed. In addition, optimal refining slag composition and adding process, adding system of modifying agent and bottom argon-blowing in ladle were researched as well. On this basis, refining process of low-sulfur steel has been optimized. The results show that sulfur content in steel is as low as 6.6×10^-6~40×10^-6，which achieved the production of low sulfur steel.

Abstract: From the point of safe operation for power plant boiler, this paper concludes and analysis the basic conditions of pulverized coal explosion, the basic mechanism of the explosion. And, this paper indicates the influence of pulverized coal explosion and parameters to evaluate the explosive characteristic of pulverized coal.

Abstract: Compared to Japan sintering process, there is a large potential in energy saving in China. In order to reduce the sintering energy consumption, some effective measures such as reducing the solid fuel consumption, the gas consumption and the electricity consumption should be taken, meanwhile new characteristic technology of energy saving should be developed. Recycling the secondary energy is the other way of energy saving for sustainable development. And most especially, waste heat recovery has a great significance for saving energy.

Abstract: The cells of Leuconostoc mesenteroides were immobilized for dextran producing and response surface methodology based on experimental designs were applied to optimize the medium for maximum yield. Eight different medium components were examined for their significance on dextran production using Plackett-Burman factorial design. Na₂HPO₄, CaCl₂ and sodium citrate were found to have significant effect on dextran production. The combined effect of these nutrients on dextran production was studied using central composite design. The optimal concentration of variables for maximum dextran production were 0.245 g/100mL of Na₂HPO₄, 0.05 g/100mL of CaCl₂ , 0.2084 g/100mL of sodium citrate. The maximum concentration of dextran obtained at 24 h by predicted model was 1.88045 mg/mL that was in perfect agreement with the experimental determined value 1.85395 mg/mL. Dextran yield was over 376% higher as compared to original medium which gave 0.38956 mg/mL of dextran.

Abstract: Sulfur-doping and broad band absorptive black silicon materials were fabricated by picosecond laser irradiation. Two kinds of microstructures, laser induced periodic surface structure (LIPSS) and conical spikes were obtained by changing parameters of laser scanning. Black silicon solar cells with back surface field were explored. Influences of different rear side structures to devices were presented and conversion efficiency of 9% is available.

Abstract: The TiNiV shape memory alloy wire that was cold pressed under 9Mpa at the room temperature had good superelasticity. On this basis, a tensile test was made after a series of medium-temperature treatment. Then the effect of superelasticity and microstructure of TiNiV shape memory alloy by medium-temperature treatment were studied. The results indicate that the experimental wires assume thorough non-linear superelasticity after holding 30 min at 430°C. The superelasticity of the wire enhances firstly, then declines with the ascent of the temperature and extension of the time of the holding. A kind of potentiation phase-Ti3Ni4 precipites out of the wire under different medium-temperature treatment.

Abstract: Through the analysis of the utility between the oriented silicon steel and the non-oriented silicon steel, this paper stated the different performance characteristics requirements of the silicon steel to various utility; According to the different characteristics requirements, this paper expounded the different requirements of heating process in the oriented silicon steel and the non-oriented silicon steel.

Abstract: In this article, the viscosifying abilities, rheological properties, and flow characteristics of hydrophobic association water-soluble polymer with high association ability were studied using technical methods of viscosity measurement, rheological and core flow experiments. The results illustrate that hydrophobic associated polymers with low molecular weight rely on a strong hydrophobic interaction, the intermolecular and intramolecular micellar structure formed in solution with a strong ability to increase viscosity. Hydrophobic association water-soluble polymer, comparing with partially hydrolyzed polyacrylamides polymer with low molecular weight, presents a better ability of shear stability under the condition of shearing and the solution structure strengthens gradually so as to increase viscoelasticity remarkably. The hydrophobic association water-soluble polymer with high association ability take on greater injectivity and mobility control ability in low permeability porous media solving the problem of low injectivity and poor control ability in mid-low permeability reservoirs, which improves polymers flooding effect in such reservoirs and underlie the reasonable design of polymer molecular structure.