Advanced Materials Research Vols. 160-162

Abstract: The variable regulation of maximum principle stress and deflection of glass panel in hidden curtain wall were analyzed by using uniform negative and positive wind pressure tests. The curve of maximum principle stress and deflection were compared in the two different wind pressure conditions. The glass panel used in specimen is monolithic toughened glass. The dimension of the glass panel is 1000mm×1000mm and its thickness is 6mm. The dimension of silicone structural sealant is 12mm×8mm. Test result indicated that the maximum principle stress and deflection of every test point increase linearly with the increasing of the uniform load from 0.5kPa to 2.0kPa; the curve of maximum principle stress and flexural performance of glass panel have obvious differences when the specimen was tested in negative and positive wind pressure. When the glass panel was tested in positive wind pressure, its load-carrying capability was better than it was tested in negative wind pressure. The flexural performance of glass panel was also in the same way.

Abstract: Two kinds of Er-doped lithium phosphate glass have been chemically strengthened by ion exchange in a mixed binary melt of KNO3 and NaNO3 at temperature far below glass Tg. Ion depth profile has been determined with WDS technique. The effect of acid wash on surface morphology, hardness and fracture temperature of glass was investigated. It was found that acid wash following ion exchange could improve the surface morphology and strength of glass. Nevertheless, WDS analysis showed that the acid wash could cause the ion diffusion from glass surface to acid wash liquid, i.e. the back diffusion of K+ and Na+. The results revealed that the back diffusion of K+ was severer than that of Na+ during acid wash and the bond of K+ to glass network was weak.

Abstract: First building up the test bed of heat recovery unit which made use of Self-Exciting Mode Oscillating-Flow Heat Pipe heat exchanger, simulated the conventional wood drying chamber exhaust conditions, this paper compared and analyzed the different heat recovery efficiency of this heat exchanger under different operating modes. The results showed that: when the air flow and temperature at the hot end kept steady, the heat recovery efficiency increased as the relative humidity increasing; while the air flow and relative humidity at the hot end remained stable, the heat recovery efficiency decreased along with the temperature increasing; the hot end temperature reached the top on the dew point. The average heat recovery efficiency of Self-Exciting Mode Oscillating-Flow Heat Pipe heat exchanger was about 15%.

Abstract: Laser transmission microjoining of two dissimilar materials has become a very significant technique. In this research, a numerical method is developed using finite element technique to determine the condition of joining two dissimilar materials namely Polyethylene terepthalate (PET) and titanium. First the model is used to optimize the laser parameters like laser traveling speed and power to obtain good bonding. A good combination is achieved at the power of 8W and laser traveling speed at 150mm/min.After the verifications, the profile of residual stress of the laser microjoint has been calculated using the developed model. The residual is low near the centerline along the traveling laser beam, and a higher values is away from the centerline at the x-direction shown by the contours on the PET surface. Higher residual von Mises stress near the centerline along the traveling laser beam and the stresses reduce as the distance away from the centerline.

Abstract: Attapulgite was organic surface modified with silane coupling agent (KH570) and acetone, with ferric chloride (FeCl3∙6H2O) as the oxidant, sulfamic acid(SA) as dopant, prepared polypyrrole/attapulgite with organic surface modification conducting nano-composite materials (PPy/ATTP-KH) by chemical oxidation polymerization, and using IR, XRD and SEM characterization methods to characterize Internal structure of composite materials obtained. The results show that in the condition of n(Py):n(FeCl3∙6H2O):n(SA) =1:1:0.5, and with the increase of contents, composite conductivity increased and then decreased, when the contents of attapulgite is to 50%, the conductivity reaches maximum 30.0 S•cm-1. We can see from the IR spectrum, silane coupling agent and hydroxyl of attapulgite surfaces have a chemical bonding, and plays a good modification to the surfaces of attapulgite, Thereby enhancing the conductivity of the composite materials.

Abstract: Powders of tantalum, niobium and an alloy thereof have been prepared by the electro-deoxidation of their oxide precursors in a eutectic melt of CaCl2-NaCl at 1098 K. The reduced products were characterised by X-ray diffraction analysis, scanning electron microscopy, energy dispersive X-ray analysis, and quantitative oxygen analysis. All metallic materials were of high purity and had porous nodular microstructures. The alloy powders were single phase, with a relatively wide particle size distribution and some variation in the local Ta-to-Nb ratio. The oxygen contents of the products were below 5000 ppm by mass.

Abstract: The performance of two-phase anaerobic in a laboratory-scale operating on traditional Chinese pharmaceutical industry wastewater at various hydraulic retention times was investigated. The wastewater with high pollutant concentration in reactor designed based on two-phase anaerobic principles was analyzed with GC-MS. The effect of controlling the pH of the methanogonic phase of traditional Chinese pharmaceutical industry wastewater digestion on the biogas production rate and pollution potential reduction was also investigated. The reactor was designed to act as a liquid-solid separator, in order to maximize the microbial mass in it, and was operated at different hydraulic retention times. It operated as a two-phase reactor when the pH of the wastewater was controlled in the methanogenic phase. The results of experiment indicate that acidifier discomposes compounds composed of big molecule were degraded into small acid molecule which is more subject to biochemical treatment, and after the final treatment of reactor producing methane, species and contents of compound contained in treated wastewater are obviously reduced.

Abstract: With the disadvantages of complex structure, complicated operation and power control, the application of existing high-building escape device are restricted. A novel high-building escape device is designed based on TRIZ theory, which has the advantages of simple structure, easy operation and without electric or other energy. With the transformation of closed-loop mechanism, the gravity of escape person generate the resistance preventing the rapid drop of escape person. The closed-loop mechanism consists of driving shaft, feedback shaft, drving gear, feedback gear and rope. One end of the rope is winded around the driving shaft, and another end is tied with escape person. With the reduction of layers number of rope, the pressure angle between feedback shaft and rope increase, which cause the raise of resistance and the decrease of landing velocity of escape person. Simulation and experiment show that the designed escape device is effective and safety.

Abstract: By combining magnetostrictive actuator with flow valve directly, the flow was precisely controlled due to magnetic materials’ properties of fast response (less than 1μs)and large magnetostrictive strain (up to 1500ppm). The structure was designed based on this theory, and the flow - displacement model of valve was established by analyzing the size of the valve opening in different incentive current. The flow field was analyzed through multi-physics analysis software COMSOL. Simulation results showed that, the continuous adjustment and precision control were realized in a certain range of flow in the valve. Therefore, it could not only adjust the flow in micro amount directly, but also can be a pilot valve for high frequency precision large flow valve.

Abstract: The Lorentz medium model for magnetization is modification, through which the whole Lorentz models become more symmetric one than traditional forms used in [3-5]. The modification can also have the deduction for more general Poynting’ theorem in dispersive media became a regular procedure. As an application, those forms of energy density in [4, 5] are special cases of generalized one shown in the letter under the establishment conditions for time-independent situation.