Search

This paper makes the historical data which customers bought the products as the foundation, and suggests a method of personalized product design knowledge acquisition based on knowledge reduction and knowledge mining. Firstly, the core matrices of each specific customer group were taken as the decision variables of the decision table based on the key customer segmentation. Secondly, the knowledge reduction algorithm of Skowron discernibility matrix was use to acquire the product design information by reducing the decision table, and deleting the redundant and even product matrices that are not necessary. Thirdly, the product design information was taken as the initial data of knowledge mining, and the product design knowledge of specific customer group was obtained by a classification consistency algorithm. Finally, the stroller experimental design was taken as a case study by online interaction based on Web technology, and the conclusion of the study showed that the method was feasible.

The colloidal crystal template or opal with a closed-packed face centered cubic (fcc) lattice was prepared from monodisperse polystyrene (PS) microspheres by gravity sedimentation, and it was used for the fabrication of polyaniline hybrid with inverse opal structure. The template provided void space for the infiltration of Bi2Te3 and monomer that was then in situ polymerized to polyaniline. The opal composite was then soaked in toluene for completely removing PS microspheres to form porous polyaniline hybrid with inverse opal structure. The PS microspheres were replaced by air microspheres, which interconnected each other through the windows on the polyaniline hybrid wall. Both the wall and the air void constitute continuous phases. The polyaniline hybrid with inverse opal structure was observed with scanning electronic microscopy.

For a distributed PEMFC power station utilizing biogas as a source to produce hydrogen, deep desulfurization of the biogas is important. ZnO/γ-Al2O3and CuO/γ-Al2O3were prepared by an impregnation method, and their performances on CH3SH removal in the biogas have been studied. Results showed that CuO/γ-Al2O3is able to remove CH3SH to below 10 ppb at 250-400 °C and has a sulfur capacity of 0.056 mmol g-1at 300 °C. Regarding to the desulfurization mechanism, it has been confirmed that the removal of CH3SH with CuO/γ-Al2O3is based on chemical adsorption. In the desulfurization, CH4s dry reforming took place at above 250 °C, and the generated H2and CO reduced CuO to Cu2O and Cu. Further, it was supposed that H2S generates through the hydrogenation of CH3SH at the presence of H2.

The degradation of Rhodamine B, a common pollutant existing in industrial wastewater, has been explored using a hydrodynamic cavitation reactor combined with CCl4treatment. The effects of CCl4concentration, operating pH values, inlet pressure, initial temperatures and initial RhB concentration were investigated. The result shows that the removal of RhB increases from 70.78% to 80.38% with increasing CCl4concentrations during hydrodynamic cavitation. Degradation of RhB with CCl4treatment increased as the operating pH value and its initial concentration decreased, a 7-fold increase (from 0.22×102min1to 1.68×102min1) in the kinetic rate constants were found at pH values ranging from 4.0 to 2.0. In addition, RhB degradation with CCl4treatment increased as the inlet pressure and temperature increased. From the present work, we conclude that the RhB degradation reaction follows a pseudo-first-order kinetics, and the mechanisms of CCl4enhancement are subsequently discussed.

PVA hydrogel has been used in the field of cartilage replacement in recent year. In order to improve the water-keeping ability of PVA gel and mechanical property, PVP was introduced into PVA and crosslinked by adding ammonium persulfate to form a composite gel. The crosslinkage of the gel was identified, and the effect of PVP and ammonium persulfate amount on the composite gel was studied. The crosslinkage, the degree of swelling and the compress stress of the composite gels have been tested. UV analysis was used to investigate the release of PVP from the composite gels. The dried composite gels were put into water to investigate the degree and velocity of the rehydration of different composite gels.

Calcium sulfate/tri-calcium phosphate (CaSO4/TCP) composite bone fillers were fabricated through molding method. Their structure and properties were characterized by infrared spectroscope, scanning electronic spectroscope, x-ray diffraction and degradation test. The results show that TCP crystals were attached to the CaSO4 crystals and prevented the growing of sulfate crystals. So their size is shorter than that of CaSO4 crystals prepared from pure CaSO4 semihydrate, and some even had defect. The resorption rate of CaSO4 bone fillers was decreased when TCP was incorporated.

Industry, construction and transportation are the key fields of carbon emission. Based on the reality of Dongying City, and combined with relevant statistical data, carbon emissions in industry, construction and transportation of Dongying City are accounted objectively. The results show that carbon emission in key fields of Dongying City has a fast increasing tendency from 2005 to 2009. Among which, carbon emissions of industry account for the largest proportion with the five-year average of 82.04%, followed by the construction and transportation, with the five-year average of 12.77% and 5.19% respectively. Therefore, adjusting and optimizing industrial energy consumption in the key fields is crucial to carbon emission reduction of Dongying City. This has an important significance for Dongying City to achieve energy conservation, emission reduction and build a low-carbon ecological city.

Spatio-temporal change of land use and land cover from 1985 to 2005 in Chao River Basin, the important water source to Miyun Reservoir, was analyzed based on GIS technology. The results showed that woodland was the main land cover type in the basin, and then the arable land and grassland. During 1985-2005, the area of woodland increased, while the area of grassland greatly reduced. Changes of land use and land cover were more violent from 1985 to 1995 than that from 1995 to 2005. There were obvious regional differences in land use change in the basin. The conversion from grassland to woodland was the dominant process of LUCC in the basin, and this was relevant to the national ecological construction policies on water resources conservation.

This paper analyzes the shortcomings of the traditional AHP method and proposes group decision making from a single decision-making. In group decision making the weight of experts is very important. This paper discusses the existing methods of determining experts’ weights, introduces the method of the similarity of the cosine of the vectors’ angle, and the weight of experts is determined dynamically according to the similarity of the judgment matrix given by experts. When determining the weight of experts, judgment matrixes experts give need to pass the consistency test. In this paper, AHP group decision making method is applied to the load balancing system to determine the index weight influencing on load balancing. The experiment in the paper shows that this method can reduce calculation of consistency test and make the decision-making results more effective.

Ultra thin graphene oxide (GO)/polyvinyl alcohol and graphene-polyvinyl alcohol/gelatin composite films were fabricated by electrostatic layer-by-layer assembly and spinning coating methods. The assembling and coating process were traced with UV-visible absorption spectroscopy and the morphology of the formed ultra thin films was observed under scanning electron microscopy. The results show that the adsorption value of the GO based composite films linearly increased as the number of layers increased. The ultra thin graphene oxide/polyvinyl alcohol and graphene-polyvinyl alcohol/gelatin composite films have layered structure with high tensile strength because of the incorporation of GO. These strong ultra thin films have potential applications in coating, sensor and electrochemical devices.

The morphology and growth mechanism of carbon nanotubes(CNTs) and carbon nanospheres (CNSs) produced by in-situ CVD method on different substrates were investigated using scanning electron microscopy (SEM), transmission electron microscope (TEM) and energy dispersive spectrometer (EDS) technology. The experimental results show that the growth of carbon-nano-material has great substrate independence during in-situ CVD process. At the same reaction conditions, CNTs with diameters of 60-140nm and CNSs with diameters of 150-450nm were synthesized on the 1K carbon cloth and graphite paper substrate, respectively. Based on the experimental results, a probable growth mechanism was presented for different carbon substrates. The explanation for the formation process is the difference of the concentration gradient and growth rate in the catalyst.

CO2absorption enhanced diesel steam reforming was investigated for hydrogen production in this paper. The utilization of CO2absorbent in the reforming reactor sharply decreases the CO2level in the reacting gas and shifts the equilibrium towards hydrogen formation. This increases the diesel conversion and reforming rate of hydrocarbon at relatively low temperature. At the temperature of 600°C, reforming rate of hydrocarbon reached 95%, and that is 30 percent higher than that in traditional steam reforming reaction without absorbent. In an optimal temperature range of 545-625 °C, diesel conversion could reach near 100%. Hydrogen concentration reached 95% when using CO2absorbent, correspondingly concentrations of CO, CH4, and CO2decreased obviously, while hydrogen concentration was about 70% in conventional diesel steam reforming process. Further, a novel PEMFC system for hydrogen production was proposed by combining CO2absorption enhanced diesel steam reforming (AEDSR) with chemical-looping combustion (CLC) process, which could continuously produce hydrogen and regenerate absorbent at the same time, heat balance of steam reforming and CO2absorption reaction could also be obtained by adjusting the amount of reforming catalyst and CaO.

According to multi-resolution analysis of wavelet threshold denoising principle, this paper presented two improved algorithms of continuity and adaptive threshold based on hard thresholding. The soft thresholding (hyperbolic thresholding) was used in the intervals after setting two thresholds, and the isolated points were removed according to the adjacent correlation coefficient during the processing. As a result, the hard thresholding’s shortcomings were reduced. The simulation results show that improved algorithms have both better visual effect and PSNR than the traditional approaches.