Advanced Materials Research Vol. 717

Abstract: A novel functionally gradient composite was reported in this article. The composite material are composed of plain low carbon steel Fe360 as a substrate and glass-ceramics containing ZrO₂ reinforcing particles as a coating. Based on a mathematical model of the residual stress, the geometric model and finite element analysis models of the Fe360/glass-ceramic gradient coatings were established. The residual stress of the gradient layers was calculated with the commercial software ANSYS 10.0. The results showed that the differences of thermal expansion coefficient and shrinkage rate in each layer resulting from the difference of the volume fraction of ZrO₂ in each gradient layer could make the surface layer generate suitable compressive stress. The maximum residual stress presents itself at the interface between the substrate and the gradient coatings. The layer numbers and the thickness of graded coatings have a significant effect on the residual stress.

Abstract: Stress measurement based on the change of ultrasonic surface wave has been accepted to find out residual or existing stress on material. This paper shows the effect of rolling direction and grain size of material on surface wave velocity and energy attenuation. Different grain and rolling direction of material type SS 400, S420 and A516 were selected to test its effect. Three grain sizes of each material were varied by normalizing process at three temperature range (no heating, 850°C, 980°C and 1160°C). Through transmission ultrasonic surface wave, frequencies 2.25 and 5 MHz, were applied and recorded the velocity and attenuation of the response. The results show that rolling direction and grain size slightly effect on attenuation of ultrasonic wave but unaffected on sound velocity. Its outcome was compared with the effect of the material coating.

Abstract: Ultrasonic surface wave have been implemented to measure or predict the existing stress on material. Surface wave velocity shows linearly increase with stress applied in material. However, various applications were coated their surfaces with high corrode resistance material for example paint or aluminum thermal sprays. It may cause the change of the velocity of surface wave and lead to miss prediction. This paper presents the effect of material coating on surface wave velocity and its attenuations. Paint and Aluminum thermal spray coated on low carbon steel graded S420 (EN 10025 Standard) in the range of 100-500 micron. Through transmission ultrasonic surface wave was applied to measure the velocities change. Their frequencies are 2.25 and 5 MHz respectively. It was found that coating thickness show effect on sound velocity and sound wave attenuation. The benefit is to know the effect of coating and to approve the accuracy of stress measurement by ultrasonic wave.

Abstract: In this paper, using methyl red as polar probe, a containing LPS macromolecule emulsifier (HBS-1, MW is about 106Da) micellar aggregates in different polar medium (ethanol, n-butyl alcohol, ethylene glycol and DMF) structural properties, and provide a theoretical basis for the mechanism of the emulsified crude oil.

Abstract: In the previous study, the decolorization of azo dye was significantly enhanced by the light irradiation. The aim of this study is to investigate the effect of methyl orange decolorization under light-emitting diode (LED). The effect of media, pHs, and nitrogens on methyl orange decolorization by freely suspended cells are examined. The results showed that the optimal conditions for the methyl orange decolorization by the Tsukamurella sp. J8025 are incubation at 30 °C and pH 8.0 in YEME medium under white-light LED.

Abstract: ADAM17 is an important membrane-bound proteinase, and it can release a lot of proteins from their membrane-bound forms, such as cytokines, cytokine receptors and adhesion proteins. ADAM17 has long been an interesting therapeutic target in a lot of diseases; however, the development of its inhibitors has been hurdled by our very limited knowledge on its substrate specificity and selectivity. To understand the substrate specificity of ADAM17, here in this paper, a rational complex model is computationally built for the catalytic domain of ADAM17 and its recognizing sequence from the TNF-alpha precursor (proTNF-alpha). With protein-peptide docking analysis, we found that the substrate binding step is indeed important for ADAM17 recognition and processing. The result in this paper could be useful for the understanding of the substrate specificity and selectivity, and the design of novel ADAM17 inhibitors in the future.

Abstract: Rising rate of high energy trauma, mainly due to increasing life expectancy of the population on a global scale in recent decades and more intense daily activity, involves the need to address the increase of more complex fractures, thus putting to the test the experience of trauma surgeon and the quality of various osteosynthesis materials. Metallic materials designed for orthopedic implants must present a group of properties that strength, biocompatibility and resistance to degradation (corrosion or wear) are of primary importance. To reach these objectives, the materials used in the manufacture of orthopedic implants must meet standard requirements. These requirements include primarily standard chemical composition, microstructure and macroscopic appearance. In this paper we present a study to determine the cause of degradation of osteosynthesis material. The most frequent causes of degradation include poor or unstable fixation of osteosynthesis or material defects. A valuation technique, including optical and scanning electron microscopy (SEM) was used to assess aspects of macroscopic and microstructural degradation and chemical composition of implants. These assessments showed that both design errors and inappropriate surgical procedures were due to failures.

Abstract: There isn`t clear definition of steep inclined coal seam at home or abroad at present. Generally,the inclined coal seam with 35°~55° inclination is called steep inclined coal seam in mining field [. During the mine program in steep inclined coal seam,due to its special formation of roof and floor,not only perpendicular pressure to coal seam is distinct,but also the component of gravity along the direction parallel to coal seam is significantly increased and the parallel pressure which causes slippage of roof and floor is the main factor resulting in the distinct roadway transformation. Uncertainty and asymmetry transformation or destroy of roadways brings great difficulties to the mine of steep inclined coal seam,especially for the asymmetry transformation which is a huge challenge to the support of roadways,so it`s necessary to summary and analyse the factors affecting asymmetry transformation of roadways in steep inclined coal seal. Through classifying these factors by the main and secondary,this paper will provide reference for reasonable arrangement of roadways and effective support scheme in steep inclined coal seam. Many scholars did some research in laws of roadway deformation in steep inclined coal seam,but few of them compared or did sensitivity analyse of these factors. Zhang Bei etc. built the numerical simulation models of roadways with different inclination and found the key position of the deformed surrounding rocks [;Sun Xiaoming etc. aimed at the asymmetric deformation of surrounding rock around deep roadways and investigated its failure mechanism and coupling control countermeasure [;Cao Shugang etc. analysed the stress distribution rules of roadways in steep inclined and medium coal seam by ADINA program and put forward some control measures [. In different inclination conditions, this paper simulates asymmetry deformation of roadways with different section form in steep inclined coal seam through FLAC3D program and analyses the sensitivity of these factors affecting asymmetric deformation.

Abstract: For understanding the influence of cast-in-place floor slab on the failure mechanism of "Strong column-weak beam", nonlinear finite element simulation of a 1/2-scale one-story, two-bay RC frame specimen has been carried on using DIANA software. The analysis model was designed and constructed according to the design drawings of Xuankou middle school building. Through the comparison and analysis, it shows that the 3 D solid finite element model established is feasible to analyze the mechanical performance of RC frame, and the contribution of cast-in-place floor slab on the negative flexural capacity of frame beam, which is disadvantageous to realize the failure mechanism of "Strong column-weak beam", should not be neglected.

Abstract: The H beam structure has high requirement for the force condition in weighing. The paper do a detailed analysis for the force condition of the cup support in the weighing procedure, through the design and finite-element analysis for the weighing cup support of the 3M101 module A12 cup support. Improves security and at the same time make the stress-strain in the weighing procedure in the allowable range.