Advanced Materials Research Vol. 1015

Abstract: Based on the mixing ratio design of the cement-clay composite powder mixed mortar ,in this article,the 28d strength was early presumed by the 7d strength;by the method of mathematical statistics, different regression equations were established and the results were compared,which indicated that exponential equation had a better stability;the early presumption of 28 day strength of cement-clay composite powder Mixed Mortar provided a scientific basis for engineering construction.

Abstract: During the strip laminar cooling process, the switching of cooling valves is decided by different operating modes, initial and rolling-terminating conditions. Aimed at shortening the development cycle and at the same time assuring the quality and regularity of the controlling program, this paper has designed a hot strip laminar cooling prediction software adopting the RTW code generating technique. First, the Simulink model of the cooling process is built. Second, the model is converted by RTW into C code which can launch without Matlab. Finally, the graphical user interface design is completed with the generated code incorporated in. Experiment shows that the software developed with this method can gain the same results as Simulink model. The work of manual coding is substantially reduced. The combination of convenient modeling of Simulink and flexible GUI designing of VC can provide better reliability and practicability than traditional software developing.

Abstract: Through traditional corrosion method of aluminum alloy weld could only get a black-and-white metallographic structure. Color metallographic structure could be got by using color metallographic technique, which could improve discrimination of metallographic structure. The welding test pieces were got by using A7N01 and A6N01 aluminum sheets as base metal and E5356 and E4043 as welding wire. Through sampling, mounting, grinding and polishing process, metallographic specimens were obtained. Contrast test of aluminum alloy specimens was investigated. Conventional Keller’s reagent corrosion results showed the grain outline was not very clear and the grain boundary was fuzzy. Color metallographic corrosion results showed both the grain outline and boundary were very clear. Grains of different orientation and composition segregation presented different color. So color can be used to distinguish orientation and composition segregation. Color metallographic technique was better than black-and-white metallographic technique to observe the metallographic structure.

Abstract: In this paper, the simple and effective experimental method is proposed for studying on the influence of tracing deviation on solar-pumped laser output performance. The threshold pumping power is obtained by the novelty method. The experimental setup of solar-pumped laser employed Fresnel lens of 1.4×1.05m² and diffuse reflective conical cavity focusing solar radiation on the size of 5mm×60mm Cr/Nd:YAG ceramic. The effective threshold pumping power calculated is 190W, which is about 30% lower than reported results.

Abstract: Phenolic-quartz hybrid fabric reinforced phenolic resin composites were fabricated by compression molding and the mass ratios of phenolic fiber to quartz fiber were 1:3, 1:1 and 3:1, respectively. The ablative properties of the composite specimens were quantitatively evaluated by oxyacetylene flame test and exhaust plume ablative test with a small liquid motor (EPSLM). The effects of mass ratio of phenolic fiber to quartz fiber on the ablative properties of the composites were investigated. In the oxyacetylene flame test, the mass loss rate of the composite specimens, which can be predicted by the mixture rule, increased with rising content of phenolic fiber. However, the mixture rule was not applicable to predict the mass loss of the composite specimen in EPSLM. The mass loss of the hybrid composite specimens decreased with increasing content of phenolic fiber. As suggested by the patterns and microstructures of the char after ablation, it is useful to stabilize the char by adding phenolic fiber, and the resistance of the hybrid composite specimens to heat-flow erosion was evidently augmented when the mass ratio of phenolic fiber to quartz fiber was higher than 1:1.

Abstract: The centre Au-doped armchair graphene nanoribbons (AGNRs) are investigated using the local density approximation based on density function theory. The charge density, electronic energy band and project density of states of centre Au-doped AGNRs are calculated. Our results indicate the charge density is transferred between C and Au atoms and mainly located on the Au atoms. The centre Au-doped AGNRs are an indirect band gap semiconductor with an energy gap of 1.046 eV. The Fermi level is located on valence band so that the AGNRs of doping Au become into degenerate semiconductor. The project density of states is calculated to reveal localization and hybridization between C-2p and Au-6s, 5d electronic states. The localization and hybridization are much stronger in the valence band. The hybridization between C-2p and Au-6p electronic states are strongly in the conduction band.

Abstract: For the same hard machining materials, the tool life, the axial distance for cutting and the material removal amount were adopted for the orthogonal test. The results show that the high tool life usually corresponds to low cutting parameters, which means the poor processing efficiency. The results have poor potential applications. The axial distance for cutting and the material removal amount can represent the machined surfaces and the removal quantity of materials, respectively, which can perfectly reflect the relation between cutting parameters and application effect. In the optimization test, the processing efficiencies by two evaluation parameters are all better than by tool life. But it's important to note that the results by two parameters are different, the special works still need to be made according to the real situation.

Abstract: Based on theIIgold ore body in Duolanasayi, some geological features of ore body are introduced. In order to decrease the ore dilution and mining loss rate in practical production process as well as make full use of resource, this paper proposes five mining methods and gives optimal combination of these methods after analyzing the advantage and disadvantage of the mining methods.

Abstract: In recent years, due to the unique advantages of nanomaterials, they are widely used in many fields (including the field of tissue engineering, protective clothing, filters, sensors, etc.). How to prepare nanofibers has become a hot research topic. This paper outlines status quo of a class of preparing nonafibres. And this preparation is the centrifugal spinning including melt centrifugal spinning, centrifugal electrospinning and solution centrifugal spinning, which have broad prospects for development. And this paper also briefly describes theirs advantages and disadvantages. Finally, the development trend of centrifugal spinning is summarized.

Abstract: The Ni-Mn-In alloy occur martensite reverse phase transitions driven by magnetic field in a certain composition range, resulting in the macroscopic strain, and along with the output of up to 108 MPa stress. However, there are some defects impeded practical application of alloy, such as brittleness and low Curie temperature. So, we will improve its mechanical properties by doping the suitable rare earth Gd elements in Ni-Mn-In alloy in this paper.In this paper, we study the microstructure, martensitic transformation and mechanical properties of Ni_45.4Mn4_1.5-xIn_13.1Gd_x (x=0,0.2,0.5,1,2) magnetic shape memory alloy by DSC and Compression fracture strength and strain curve, which clarify the influence of Gd doping on martensitic phase transformation and mechanical properties of alloys.The studies have shown that the microstructure of the alloy changes from single organization into a mixed-phase structure of the matrix and the rich-Gd phase with the increasing of rare earth Gd content and martensitic transformation temperature of the alloys increases gradually with the increasing of Gd element content; The fracture strength and fracture strain increases first and then a decreasing trend with increasing the rare earth Gd elements. The result of the improved mechanical properties is the co-action of fine grain strengthening and second phase strengthening.