Advanced Materials Research Vols. 476-478

Abstract: A series of novel red light-emitting phosphors Li2Y4-xEux(WO4)7 were synthesized by solid-state reaction. The phosphors were characterized by XRD and luminescence spectra. The results show that the phosphors can be excited by near-UV light of 395nm effectively. The relative intensity of the sample reaches a maximum when x is 2.8. The main emission line is 5D0→7F2 transition of Eu3+ at 615nm, and they can be used for white LED.

Abstract: Membrane Potentials across the Cation Exchange Membrane in Aqueous Mixed Solutions Made of Two Kinds of Electrolytes Were Experimentally Studied. Effects of both the Concentration and the Species of Electrolytes on Membrane Potentials Were Presented. for any Mixed Solution Made of Two Kinds of Electrolytes, when the Total Electrolyte Concentration at Right Side of the Membrane Is Fixed, the Membrane Potential Increases with the Total Electrolyte Concentration at Left Side of the Membrane. however, such Increase Is Rather Slight at both Low and High Concentrations. when the Concentrations at each Side of the Membrane Are Equivalent for Three Mixed Solution Systems, the Membrane Potential Decreases with such Order: ΦKCl+NaCl>ΦKCl+MgCl2>ΦKCl+AlCl3.

Abstract: Paraffin/expanded perlite composite phase change energy-storage material (PPCM) was prepared with expanded perlite as adsorption material and paraffin as phase change energy-storage material (PCM). The DSC and SEM results showed that the internal micropores of expanded perlite were filled with paraffin; the phase change temperature of PPCM was basically similar with that of paraffin and the latent heat of PPCM was corresponded with that of paraffin based on mass ratio among PPCM. PPCM was incorporated into gypsum to prepare gypsum matrix phase change energy-storage material (GPCM), and its mechanical properties, water absorption and temperature control effect were determined. The results showed that with the increase of PPCM’s content, the 2h compressive strength, flexure Strength and water absorption of GPCM continuously declined and its temperature control effect significantly enhanced.

Abstract: The key technologies and implementations of aircraft assembly resource management system are being researched in our paper, and the definition and classification of assembly resources are proposed, and classification model library are being created, at the same time the knowledge database, data models and inference mechanism assembly resource knowledge database system are designed, at last resource management system assembly are developed with the database software.

Abstract: LiFePO₄/C cathode material with particle size of 5~6 μm and tap density of 1.67 g•cm-3 was prepared based on spherical crystal FePO₄•2H₂O powders. The spherical crystal FePO₄•2H₂O powders were first prepared by a simple hydrothermal synthesis via the amorphous FePO₄•2H₂O solution maintained at 150°C for 12 h without any supplementary equipment. The produced LiFePO4/C powders exhibited the initial discharge capacity of 137 and 118 mAh•g-1 at 0.1 C and 0.5 C, respectively. The volumetric capacity of the spherical LiFePO₄/C powders corresponded to 230 and 197 mAh•cm-3, which are remarkably higher than irregularity powders. The high-density spherical LiFePO₄/C powders produced by this novel method can be considered as a very promising candidate in the high-power batteries.

Abstract: It is a key problem that readers collide with each other which infuences the identification effciency of RFID system. This paper, which is based on the character that the frame-lengh restricts by EPC C1G2 RFID system, analyses the mechanism of anti-collision in Framed slotted ALOHA and the characteristic of classical responder estimate method. And it also gets a EPC C1G2 RFID algorithm which is based on IEM among readers. The result of simulation is given too.

Abstract: Removal of copper-cyanide complexes from electroplating industry effluent were studied by using an ion-exchange process. A kind of polypropylene strong alkaline anion exchange fiber was used to perform packed beds continuous experiments. The conditions of adsorption were wastewater pH value 9.0 and flow rate 90-120 BV•h-1 at room temperature. The packed beds were exhausted at 1300 bed volumes for copper-cyanide complexes The elution of copper-cyanide complexes from ion-exchange fiber was studied. The results showed that copper-cyanide complexes were easily eluted from ion exchange fiber using either 2.0 mol•L-1 NaNO3 or NaCl. With 1.0 mol•L-1 NaNO3 solution at 30 BV•h-1, the regenerating rate of copper-cyanide complexes was more than 95%.

Abstract: Narrow range of visible light response and low photo-quantum are the “bottleneck” for the development of Titanium dioxide film. Doping with other ions can improve the absorption rate of visible light and improve the TiO2 photocatalytic activity by reducing the band gap of TiO2 effectively and changing the electron-hole recombination rate. The recent progress of photocatalytic performance of ions-doped TiO2 films is reviewed in this paper. Finally, the current existing problems are also presented.

Abstract: This study shows a optimization usage of SA and PAE on enhancing both wet and dry strength of paper. The influence of the dosage of PAE and the viscosity of SA on the binary system for strengthening of paper have been studied and compared with paper which use PAE alone as a wet strength additive. A optimization ratio of PAE/SA was obtained, and with this ratio unchanged the amount of PAE/SA and initial of pH of the pulp has been tested. Scanning electron microscope (SEM) was used as a assistant method to observe those influence. The results showes that PAE/SA binary strengthening system for paper has a better property than that of PAE alone as a wet strength additive. The optimal viscosity of SA is about 350 mPa•S and the optimal ratio of PAE and SA is 3:2 and the addition of PAE and SA are 0.75% and 0.5% respectively. SEM analyses confirm that the film-forming property of PAE is accelerated by SA and it is also noticeable that the PAE/SA film can stick to the suface of fibres uniformly in the aqueous pulp slurry environment. The reaserch on the effects of the slurries at different pH to the wet and dry tensile strength prove that PAE/SA strength system is more suitable for neutral and alkaline papermaking conditions.

Abstract: For utilization of CO contained in tail gases of coal chemical industry, adsorption purification of HCN in closed carbide furnace tail gas was investigated on an activated carbon was modified with KOH (AC1) and the other activated carbon was modified with NaOH and sulfonated cobalt phthalocyanine (AC2). The experiment results show that two kinds of modified activated carbons are proved to be effective adsorbents for HCN removal, but the HCN adsorption capacity for AC2 is 1.47 times that for AC1. For AC2 adsorbent, the purification efficiency increased with the increase of oxygen content and adsorption temperature. The results show that, 1.5% for optimum oxygen content and 90°C for optimum adsorption temperature. The specific surface and the pore structure properties of AC2 adsorbent before and after HCN adsorption were tested by N2 adsorption experiments. The N2 adsorption tests show that, the predominant adsorption of HCN occurs in the micropores in radius 7.4～16.6 Å. Deactivated AC2 adsorbent could be restored to the original activated state, even after several regenerations.