Applied Mechanics and Materials Vols. 368-370

Abstract: Gold nanoparticles were synthesized by two bolaform cholesteryl imide derivatives with different lengths of ethyleneamine spacers at a liquid-liquid interface. By stirring the aqueous solution containing AuCl₄^- ions with the chloroform solution of bolaform amphiphile, AuCl₄^- ions were transferred into the organic phase and reduced to gold nanoparticles. Spectral and morphological measurements indicated that both bolaform amphiphiles could serve as both capping and reducing agents. Different gold nanostructures could be obtained depending on the different spacers and the molar ratios of amphiphile to AuCl₄^- ions.

Abstract: New yellow phosphors, Eu²⁺ and Zn²⁺ co-activated Sr₃Al₂O₅Cl₂, were prepared by solid state reaction technique, and their photoluminescent properties were investigated. Sr_2.6Al₂O₅Cl₂:0.20Eu²⁺, 0.20Zn²⁺ shows broadened the excitation band in near UV range and intense yellow emission under 400 nm light excitation by introducing into Zn²⁺. The single yellow light-emitting diodes were fabricated by combining InGaN-chips with Sr_2.8Al₂O₅Cl₂: 0.20Eu²⁺ and Sr_2.6Al₂O₅Cl₂:0.20Eu²⁺, 0.20Zn²⁺, intense yellow light can be observed by naked eyes from the yellow LEDs. Hence, the phosphor Sr_2.6Al₂O₅Cl₂:0.20Eu²⁺, 0.20Zn²⁺ may be applied in fabrication of phosphor-converted light-emitting diodes.

Abstract: The advance of research on activated carbon loaded metal at home and abroad was depicted. The method and character of activated carbon loaded metal was also investigated systematically. Based on the sorption mechanism, it was briefly introduced that application on removal chromium from wastewater using modified activated carbon. Finally, the work pointed the exist problems that is how to reduce cost and optimize process, how to regenerate and reuse activated carbon, and how to increase utilization activated carbon.

Abstract: In order to find suitable coal and preparation process of activated carbon from Heilongjiang coal , this paper studied preparation of activated carbon from Qitaihe, Yilan and Jixi coal, the factor of the absorption value of I₂, such as the raw coal type, ratio of alkali/carbon, activated temperature, activated time by the method of orthogonal design. The study featured the better coal and optimum conditions: The results showed that Qitaihe anthracite was the better, and the activated carbon of which the absorption value of I₂ and BET surface area respectively reached up to 1946 mg·g^-1 and 1721 m²·g^-1 above, was prepared by Qitaihe anthracite pretreated under the experimental conditions of activated temperature of 850°C, activated time of 120min and ratio of alkali/carbon of 5/1. This disquisition has definite practical significance for open the applied realm of Heilongjiang coals.

Abstract: The origin of particles which lead to reservoir damage in oil industry mainly includes internal generation and external invasion. The particles generated in reservoir include clays, mineral particles, deposits and particles which are separated out in physical and chemical effects. Particles of external invasion include invasions in the process of drillings and fracturing operations, particles in work-over operation and completion fluid operation, or debris which are carried by injection fluid (water, chemicals, etc.). The force of the particles has affected the seepage law in high sulfur gas reservoir. By analysis of the particle migration, sedimentary characteristics, and the force situation of sulfur particles, we will discuss dynamical mechanisms of sulfur deposition.

Abstract: In recent years, the environmental impact of antibiotic pollution from animal manure has gradually become the focus of attention. The compost is a common method for degradation of antibiotics, the rapid degradation of antibiotics can be achieved by adjusting the different compost conditions. Biosurfactants caused all the attention as a new class of surfactants, biosurfactants used in compost will have an impact on the degradation of antibiotics in livestock and poultry manure.

Abstract: Central wavelength and pass band width characters of S-polarization and P-polarization will separate when the filter is tilted. This paper gives us multi-layer films structure from one design method which adopts three refractive index materials. Simulation calculations of three concrete filter designs for single cavity and three cavities prove that the method is feasible.

Abstract: s: We have studied the oscillation behavior of Chinese herb medicine Panax japonicus C. A. Mey. var.major (Burk.) C. Y. Wu et K. M. Feng in oscillation reaction system acetone-KBrO₃-MnSO₄-H₂SO₄. Also discussed the effects of concentration of substrate, H₂SO₄, KBrO₃, Mn²⁺ on the period, amplitude and life of oscillation. The action of each substance in the oscillation system was verified. It provided a new way for herbal medicine identification.

Abstract: This paper describes in detail a multi-objective optimization strategy and decision-making method in the process of steel frame optimization design. A step-by-step analysis process integrating optimization algorithm and model analysis is proposed to solve the present problem. A multi-objective algorithm method using fast Non-dominated Sorting Genetic Algorithm is employed to obtain the Pareto-optimal solution set through an evolutionary optimization process. A high-level multiple attribute decision-making method based on intuitionistic fuzzy set theory is adopted to rank these solutions from the best to worst, and to determine the best solution. An example is used to demonstrate the proposed optimization model and decision-making method.

Abstract: In this study, the continuation method was adopted to explore the flow field states and flow bifurcation of incompressible flow in a four-sided lid-driven square cavity. The four plates moved at the same velocity and the opposite plates moved in opposite directions to drive the fluid in the cavity to flow. The flow bifurcation of the cavity flow when changing the driving velocity of the four plates simultaneously was discussed. The Reynolds number ranges of stable and unstable multiple solutions were determined from linear stability analysis of the obtained state solution. When the aspect ratio was 1 and the four plates were driven under the same velocity simultaneously, there were two pitchfork bifurcation points and two turning points in the flow bifurcation. Between the bifurcation points and turning points, there were two stable asymmetric solutions and one unstable symmetric solution existing. The flow bifurcation of the four-sided lid-driven cavity flow was analyzed by changing the driving velocity of two side plates when the top and bottom plates moved at the same velocity in opposite directions. According to the numerical results, when the Reynolds number of the top and bottom plates was fixed at 250 and the driving velocity of two side plates was changed, there were two non-crossing solution branches in the flow bifurcation, and one solution branch had strongly asymmetric stable solution. The other solution branch existed in the whole range of Reynolds number, and had one asymmetric stable solution. According to the bifurcation diagram, there were two asymmetric stable solutions and one symmetric unstable solution in the region of Reynolds number greater than 144, and there was only one asymmetric stable solution in the region of Reynolds number less than or equal to 144.