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MING Caibing 《中国地球化学学报》2005,24(4):370-376
Zeolite/TiO2 composite photocatalysts were prepared by adding a certain amount of mordenite in TiO2, and degradation experiments on toluene through photocatalytic reactions were implemented. In this paper, these photocatalysts were characterized by using SEM, IR, RAMAN, XRD and UV-Vis to shed light on the microstructure and photocatalytic performance of the composite photocatalysts. The results indicated that the structural hydroxy of zeolite can participate in bonding reaction with TiO2, the addition of zeolite can greatly reduce the diameter of nanometer TiO2 particles in the composite photocatalysts, and enhance the ultraviolet light absorptance of the composite photocatalysts. When the percentage content of zeolite reached 20%, the photocatalytic performance of this catalyst would be highest, with the toluene conversion rate up to 94.58%. 相似文献
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ICCP重力匹配算法在局部连续背景场中的实现 总被引：2，自引：0，他引：2
提出了在具有统一解析式连续背景场基础上实现迭代最近等值线的匹配算法,建立了局部连续背景场的最近点搜索模型,采用BFGS拟牛顿方法实现置信范围内最近等值点精确定位。分别对连续背景场的ICCP匹配算法和离散背景场的ICCP匹配算法进行了两组对比仿真实验。实验结果表明,连续背景场的IC-CP匹配算法在搜索最近等值点方面有了较大改进,匹配精度有了较大提高。 相似文献
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Structural characteristics of zeolite/TiO-2 composite and photocatalysis of toluene degradation 总被引：1，自引：0，他引：1
1Introduction Researchontheapplicationofnaturalminerals(zeolite,montmorillonite,etc.)inenvironmentalpro tectionisattractinggreatattentionofmoreandmorere searchers(WuPingxiaoetal.,2001;Suhasetal.,2000).Asthenaturalmineralshavelargenumbersof micro poresandbigsurfaceareas,thezeolite/TiO2compositephotocatalystcanbepreparedbycombining TiO2withzeolite.Nucleus formationfreeenergyof TiO2crystaldecreasesinamulti phasesystemofzeo lite,whichhelpsformnanometerTiO2crystalanden richstructuralhydroxyl;op… 相似文献
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Traditional carrier phase combinations are linear functions of the original carrier phases. We develop a new way of carrier phase combination that regards carrier phases of different frequencies as the basis of the carrier phase space. The combined carrier phase is a point of this space. Then, this point, i.e., the combined carrier phase, is mapped back to a single-dimensional carrier phase by a bidirectional mapping. The new single-dimensional carrier phase is called mapped carrier phase. The advantages of this combination approach are a long wavelength and small noise of the mapped carrier phase, which make ambiguity resolution easy. Unfortunately, the mapped carrier phase value is not well determined due to the noise in the observed phases. On the contrary, a set of possible mapped carrier phase values are attained; however, only one value is correct. To reduce the number of candidates and fix the correct value of the mapped carrier phase, the following steps are discussed: (1) The integer nature of the original carrier ambiguity is used to attain an initial set of possible mapped carrier phase values; (2) the distribution of the mapped carrier phase ambiguity is included to reduce the possible values; and (3) the Gaussian least-squares objective function is introduced to fix the correct value. As a result of these steps, a single-epoch positioning algorithm is established. Two experiments are carried out to preliminarily compare the new algorithm with LAMBDA. The results show that the new algorithm is slightly below LAMBDA in resolution success rate, but computationally more efficient than LAMBDA. 相似文献
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把GNSS双差定姿模型推广到km级短基线精密解算。指出常用的GNSS双差定姿模型存在几何上的系统偏差,该系统偏差严重影响km级基线的精密定位解算。提出了修正该系统偏差的方法,并把修正量加入定位模型,提高了模型的精确程度。采用两组实验数据分别对修正前和修正后的模型进行比较,验证了改进效果。 相似文献
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