Advanced Materials Research Vols. 490-495

Abstract: In order to analyze the dynamic performance of the steel tube filled with steel-reinforced concrete under dynamic loading, the paper based on finite element approximation and inverse power of the iterative algorithm, used FORTUNE language to establish the structural dynamic analysis program. Calculated the critical loads and natural period of vibration and other data of the steel tube filled with steel-reinforced concrete column, and through curve analysis, obtained the rules of the stability of steel and seismic performance on the column from the influence parameter of slenderness ratio , steel ratio , concrete strength and etc. The results show that the slenderness ratio impacts greater than other parameters, so it must be strictly controlled within a certain range; meantime, the results also prove that improving steel ratio and reduce the strength of the concrete is not significant on the earthquake action

Abstract: Al/α-PbO2/β-PbO2 electrodes doped with fluoride ion (NaF) were prepared by anodic co-deposition in order to investigate the influence of NaF dopants on the properties of Al/α-PbO2/β-PbO2 electrodes. In our work, we found fluoride ion will benefit for the crystallization of β-PbO2 and change the crystallite size, crystal structure, enhance the catalytic activity, and even change the mechanism of the reaction in the oxidation of the material. The presence of NaF in the β-PbO2 electrolyte could enhance the electrochemical properties of the coating and therefore make itself as a superior anode material.

Abstract: A new diarylethenes [1-(2-methyl-1-naphthyl), 2-(2-methyl-5-1,3-dithiolane-3-thienyl)]perfluorocyclopentene 1o based on a hybrid structure of naphthalene and thiophene has been developed. Its properties including photochromism, kinetics and fluorescence were investigated in detail. The results indicated that the compound exhibited good photochromism, which changing from colorless to orange after irradiation with 297 nm UV light both in solution and in PMMA film. The fluorescence switching properties shown the fluorescence spectrum of diarylethene 1o was decreased remarkable along with the cyclization reactions. Finally, using this diarylethene as recording medium, polarization optical recording was carried out successfully.

Abstract: The oil pipe is the special pipe of oil wells that is put into the wells to produce fluid or inject liquid. Because the pipe was put under the ground deeply, the higher strength and sealing are request. Therefore, the accuracy and strength of the connecting thread are required. Moreover, because of the oil wells need to be repaired frequently when they work, the shackle times are the important factor of the production life of the oil pipe. The development of the oil pipe is always blocked by the phenomenon of oil's gluing. As the remarkable feature of the Laser heat treatment process technology and the increasing of productions of the domestic laser devices, the laser heat treatment process technology was applied to the surface of the oil threaded to improve the integrated mechanical properties of oil pipe products and to extend its work life.

Abstract: Steel tube filled with steel-reinforced concrete (STSRC) is a new kind of heavy load column, which made by inserting steel skeletons into the steel tube, then injecting the concrete to the tube. In order to study the combined column’s stability subject to axial compression, we use energy method and numerical methods analysis derives the formula of stability coefficient in which slenderness ratio as the main parameters. Using the 1/1000 column length as the initial deflection of the STSRC columns by FORTUNE calculation program, stability coefficient is produced through comparison and analysis between calculated results from quantile regression and that from ordinary least square regression respectively. According to the computer results and energy method, the formula for calculating the axial stability bearing capacity of STSRC was established. A good agreement between the calculation results and testing results illustrates, which is feasible to using the calculating formula to calculate the bearing capacity of STSRC

Abstract: The paper proposes and develops a distributed control system of ceramic material shuttle kiln control of MVC pattern based on the current ceramic material shuttle kiln control in which exist plenty of disadvantages such as wasting energy sources, low efficiency, bad precision and long periods, etc. Firstly, it introduces the basic theory and the system structure graph of the MVC pattern, and discusses in detail the design layer frame and structure characteristic of control system based on MVC pattern. Finally, under the environment of the Delphi, this paper illuminates the material realization of the MVC form of the total control system with adopting the multi-thread shared same buffer method. Practice development shows that the MVC pattern can separate easily the interface of operator and computer, operation logic and data disposal, which makes the total control system have the fluent trait, the spread trait and the easy maintenance trait.

Abstract: 304 stainless steel is an indispensable and widely used material in our modern society. Recent development in the industry requires that the 304 stainless steel be very pure and have exceptionally smooth surfaces which cannot be achieved by traditional machining. The existing electropolishing solution of 304 stainless steel suffers from bad polishing effectiveness, high cost, environmental pollution and so on. In this work, we study the process characteristics of pulsed electrochemical polishing with environmental-friendly solutions in pursuing good polishing effectiveness, high efficiency, no environmental pollution and low cost. Successful attempts have been demonstrated with comparable results as traditional methods. The best recipe in our study includes: H3PO4 is 600ml/L, H2SO4 is 275ml/L, H2O is 125ml/L, polyethyleneglycol is 8-10g/L, glucose is 10-15g/L; and electropolishing for 4-5min at a current density of 50-55A/dm2, a polishing temperature of 55-60°C and a pulse duty ratio of 80%.

Abstract: Several manufactured nanoparticles (NPs) are increasingly used in consumer goods. However, NPs may also have ecotoxicological effects after being discharged into the environment. Study of biological effects of NPs with organisms representing different trophic levels helps to understand mechanisms of uptake and following biological effects of NPs. In this study, the uptake of nano-ZnO by Tetrahymena thermophila was observed with transmission electron microscopy (TEM) and electron spin resonance (ESR). The viability of Tetrahymena thermophila and its dose-effect relationship at various concentrations of the NPs were measured. The result revealed that the model organism exposed to dispersed NPs solution have oxidative damages though lethal test did not give relationship data between survival and nanosuspension concentration in the laboratory condition. Among the NPs analyzed, nano-ZnO exhibited a dose-dependent growth stimulation to the Tetrahymena thermophila cells and others showed non-significant impact. The rapid proliferation of Tetrahymena thermophila cells was further confirmed by levels of the succinate dehydrogenase (SDH), protein content of control and treated groups.

Abstract: The paper has designed the controlling circuit of CO2 heat pump water based on C8051F500 SCM and electronic expansion valve. The controlling circuit is composed of a temperature detection circuit and a electronic expansion valve drive As the temperature detection circuit uses a constant current source design, it would not be influenced by ambient temperature and can work in different temperature environment. This detection circuit’s temperature range is -50 °C - +135 °C. Electronic expansion valve drive circuit has added a photoelectric coupling isolation circuit to enhance its anti-interference capability. The system can adjust the size of the opening of electronic expansion valve according to water temperature. The opening adjustment can reach 480 steps; and the adjust speed is 2 steps per second.

Abstract: To establish a fast analytical method for simultaneous identification of polycyclic aromatic hydrocarbons (PAHs) in Water, a novel method of constant-wavelength synchronous fluorescence was proposed to the simultaneous determination of different PAHs in a mixture of 6 components. Combing the technique with a system that allowed a crude sample separation based on optimum conditions, detection conditions provided increased selectivity and sample information, and 6 PAHs could be identified and quantified by the corresponding synchronous spectra. The linear response of this method was in the range of 0~1000ng/mL (r≥0.9965), the relative standard deviations (RSD) were in the range of 0.24%~1.48% (n = 6). The detection limits were in the range of 0.028-3.45ng/mL. By using this method, real samples were determined directly and good results were obtained with the recoveries of 66.3%-103.9%, 73.9%-100.3% for spiked river samples