Abstract: A kind of intelligent materials named magnetorheological elastomers (MREs) is applied on the surface of a rotating plate to avoid resonance vibration and to attenuate the vibration amplitude. Under a variable magnetic field, the stiffness of structure with MREs can be changed in wide range. First, the field-induced shear modulus is numerically studied and compared with the experimental results. Then, other equivalent parameters in nonlinear material equation of MREs are determined. Finally, the vibration suppression effect is verified through numerical simulation of the dynamic impact response of rotating plate in a fluid-driven deployable mechanism subjected to impact loads. On the condition that the weight of the plate is fixed, its vibration response is suppressed in shorter time than original design.
Abstract: The SPI was applied in food industry widely, but the component which could affect the functionalities and it may change during storage. The effect of store temperature, time, RH and package material on SPI oil absorption were studied, when SPI was packaged in 100% N2 and Al, 80%N2:20%CO2 and Al, 60%N2:40% CO2 and Al, vacuum and Al, white paper/plastic/LDPE, and PE and then stored for 5 months in the conditions of RH55%，4°C. It was shown that the 7S/11S of SPI in all packages not change significantly. But it was observed by SDS-PAGE that the subunit of SPI disaggregated and molecules aggregated. Focus on the sulfhydryln group and disulfide bond; it was found that the content of sulfydryl decreases while disulfide bond increased sharply especially in the later three months.
Abstract: The Co-promoted Ni-B amorphous nanoalloy catalysts were prepared by the chemical reduction of the aqueous solution containing nickel acetate and cobalt acetate with NaBH4 at room temperature and characterized by BET, XRD and DSC. They were used as catalysts for the liquid phase hydrogenation of furfural to furfural alcohol in alcohol at 353 K under 2.0 MPa of hydrogen. Ni-Co-B catalyst was characterized by XRD as amorphous structure. It was active in the hydrogenation of furfural, and it was significantly more active than Ni-B and Co-B. The optimal Co/ ( Co+Ni ) mole ratio in Ni-Co-B was 0.5.
Abstract: In present work, we synthesized monodisperse Fe3O4 microsphere using a free-surfactant solvothermal reduction route and investigated effect of the precursor concentration (FeCl3∙6H2O and NaAc) on microsphere sizes under other reaction conditions held constant. The morphologies, structures, and magnetism of the products were characterized by SEM, XRD, FTIR and VSM. The results showed that the Fe3O4 microsphere with a tunable average size range from 120 nm to 300 nm is composed of many Fe3O4 collective nanoparticles. Their average diameters increased with increase of precursor FeCl3∙6H2O concentration but decreased with increase of precursor NaAc concentration. The X-ray diffraction (XRD) pattern confirmed that the Fe3O4 microspheres belong to cubic structure. Magnetic investigation reveals that the Fe3O4 microspheres have higher saturation magnetization and negligible coercivity at room temperature.
Abstract: With the speeding urbanization process in China, the amount of floating population increases at an unprecedented speed. How to solve the housing security issue now becomes a key indicator for social stability. In this paper, a new low-income housing requirement prediction method is proposed based on stepped leveling of floating population and related evaluation index predictions. Using Logistic retardant population growth model and Todaro method, floating population in the next 5 years is predicted. Then the population is divided into stepped levels to predict housing requirement. Based on the prediction of commercial house price, the method of predicting low-income house demand for different levels in urban areas is given. To demonstrate the proposed model and method, Shanghai Statistical data over the years are used and analyzed.
Abstract: In order to investigate the effect and its mechanism of esculetin on human gastric carcinoma SGC-7901 cells, the effect of esculetin on human gastric carcinoma SGC-7901 cells were investigated by MTT method in vitro studies. Then the morphological feature changes of apoptosis cells with esculetin of different concentration by transmission electron microscope were observed and the levels of Cty-c in SGC-7901 cells line using FCM method were analyzed. The results revealed that the Esculetin significantly inhibited the growth of human gastric carcinoma SGC-7901 cells and greatly decreased its growth rate with the esculetin concentration increased, and then the morphological feature changes of apoptosis cells had been observed. After 24h, esculetin could make that the concentration of Cty-c in endochylema and Caspase-3 were all increased. Thus the study showed that esculetin remarkably inhibited the growth of human gastric carcinoma SGC-7901 cells and induce its apoptosis.
Abstract: As the largest freshwater lake in north China, Baiyangdian Wetland plays an important role in ecological balance of the north China plain. Besides the high ecological value, Baiyangdian Wetland retains a health development of social economy. According to this special shallow freshwater wetland, based on the concept of coordinated development of resources, environment and social economy, the relativity of water resources subsystem, ecological subsystem and socioeconomic subsystem has been explained in detail, and a hierarchy that has three layers has been built up, and what’s more, the health index (HI) has been calculated using analytic hierarchy process (AHP). The results showed that the water resources-ecological-socioeconomic system of Baiyangdian Wetland was at the status of sub-health even at the high frequency water level (7.9 m). When the water level is higher or lower than 7.9 m, the health condition will be worse. Every subsystem is a chain of the coupling system, whichever of the subsystems changes will affect other chains. Thus, it is necessary to implement management measures according to the coupling mechanism of different subsystems; it can provide theoretic and practical guidance to the coordinated development of ecological balance and social economy of Baiyangdian Wetland.
Abstract: In this paper, it has been studied the acclimation stage of a synthetic wastewater fed with glucose as a carbon source, using a tow-chambers microbial fuel cells (MFCs). Special attention has been paid to the start-up. During the acclimation period, the microbial fuel cells (MFCs) will be exposed to variations in operating parameters. Hence, the acclimation stage of MFCs, exposed to variation in the influent COD, operating temperature, and electron acceptor, was investigated in the terms of power density, COD removal efficiency, and voltage while treating a synthetic wastewater. The power density is increased and the acclimation period is prolonged with the increase of the influent COD up to meet steady-state conditions. It is important to note that the acclimation of MFCs is not only impacted by the electricity-generating bacteria, but by the whole biological. The highest steady-state voltage, which is about 404mV, is obtained at 35°C, comparing to the operating temperature of 15°C or 25°C. In addition, the electron acceptor will obviously influence the steady-state voltage and start-up period.