钼硅酸化学吸收同时去除气流中的SO_2和NO_x

钼硅酸化学吸收同时去除气流中的ＳＯ_２和ＮＯ_ｘ赵有才，徐迪民，陈绍伟，李国建对铂硅酸溶液脱除废气中的ＳＯ２和ＮＯｘ及其吸收机理进行了研究．实验结果表明，钼硅酸能十分有效地吸收ＳＯ２并使杂多酸还原为杂多兰，而杂多兰则能还原ＮＯｘ为Ｎ２，从而达到同时去除...     

MTPP—CeOx—SiO2催化NOx还原

在密闭循环反应器中，于２９０℃下研究了ＣＯ存在下催化剂ＭＴＰＰ－ＣｅＯｘ－ＳｉＯ２（Ｍ＝Ｃｏ＾２＋，Ｎｉ＾２＋，Ｃｕ＾２＋）催化还原ＮＯ或Ｎ２Ｏ的反应。催化ＮＯ还原的活性顺序是ＮｉＴＰＰ＞ＣｏＴＴＰ＞ＣｕＴＰＰ，而Ｎ２Ｏ还原和ＮＯ深度还原为Ｎ２的顺序是ＮｉＴＰＰ＞ＣｕＴＰＰ＞ＣｏＴＰＰ．ＮＯｘ还原的催化特性和ＭＴＰＰ的电化学氧化机理有关（取决于中心金属或卟啉环被氧化的次序）。ＣＯ不仅还原ＮＯｘ而且     

MTPP－CeO_x－SiO_2催化NO_x还原

在密闭循环反应器中，于２９０℃下研究了ＣＯ存在下催化剂ＭＴＰＰ－ＣｅＯ＿ｘ－ＳｉＯ＿２（Ｍ＝Ｃｏ￣（２＋）、Ｎｉ￣（２＋）、Ｃｕ￣（２＋））催化还原ＮＯ或Ｎ＿２Ｏ的反应。催化ＮＯ还原的活性顺序是ＮｉＴＰＰ＞ＣｏＴＰＰ＞ＣｕＴＰＰ，而Ｎ＿２Ｏ还原和ＮＯ深度还原为Ｎ＿２的顺序是ＮｉＴＰＰ＞ＣｕＴＰＰ＞ＣｏＴＰＰ。ＮＯ＿ｘ还原的催化特性和ＭＴＰＰ的电化学氧化机理有关（取决于中心金属或卟啉环被氧化的次序）。ＣＯ不仅还原ＮＯ＿ｘ而且还促进载体Ｃｅ＿２Ｏ＿３物种的形成。探讨了ＮＯ催化还原的机理。     

Keggin结构钼硅稀土杂多蓝的合成及性质研究

合成了钼硅稀土二电子、四电子杂多蓝ＬｎＨ３〔ＳｉＭｏ１０＾ＶＩＭｏ２＾ＶＯ４０〕·１２Ｈ２Ｏ和ＬｎＨ５〔ＳｉＭｏｇ＾ＶＩＭｏ４＾ＶＯ４０〕·１３Ｈ２Ｏ,其中Ｌｎ＝Ｌａ,Ｃｅ,Ｐｒ,Ｎｄ,Ｓｍ,Ｇｄ,通过ＩＲ,ＵＶ,ＴＧ－ＤＴＡ,ＸＰＳ,ＥＳＲ磁化率等对杂多蓝进行表征。结果表明,杂多酸盐还原为杂多蓝后,结构上发生了轻微的畸变。     

脉冲电晕放电脱硝中N2O生成的研究

脉冲电晕放电是一种能同时脱除烟气中ＳＯ２，ＮＯｘ和飞灰颗粒的新方法，然而在一个电晕放电试验装置上的试验首次发现，在脱除ＮＯｘ的同时产生了一定量的Ｎ２Ｏ，而且随着电压和停留时间及ＮＯｘ初始浓度的增大，Ｎ２Ｏ量也增大。试验还发现，电晕放电对Ｎ２Ｏ无分解作用，空气中的氮气在电晕中不生成Ｎ２Ｏ，脱硫及喷氨脱硫不生成Ｎ２Ｏ，ＳＯ２和ＮＨ３对Ｎ２Ｏ的生成元影响。讨论了脉冲电晕放电脱硝中Ｎ２Ｏ生成的机理。     

镍取代型钼硅杂多蓝稀土盐的合成和性质研究

合成了六种过渡金属Ｎｉ取代的钼硅杂多蓝稀土盐配合物,Ｌｎ２Ｈ２「ＳｉＭｏ１１Ｎｉ（Ｈ２Ｏ）Ｏ３９」·ｎＨ２Ｏ（其中Ｌｎ＝Ｌａ,Ｃｅ,Ｐｒ,Ｎｄ,Ｓｍ,Ｇｄ）,通过ＩＲ、ＵＶ、极谱、循环发、ＴＧ－ＤＴＡ、ＥＳＲ、＾Ｔ２９ＳｉＮＭＲ、ＸＰＳ、磁化率等对杂多蓝进行了表征,实验结果杂多酸盐还原为杂多蓝后,基本结构发生轻微畸变,Ｎｉ＾２＋及Ｌｎ＾３＋未参与还原过程。     

脉冲电晕放电脱硝中N_2O生成的研究

脉冲电晕放电是一种能同时脱除烟气中ＳＯ２，ＮＯｘ和飞灰颗粒的新方法。然而在一个电晕放电试验装置上的试验首次发现，在脱除ＮＯｘ的同时产生了一定量的Ｎ＿Ｏ，而且随着电压和停留时间及ＮＯｘ初始浓度的增大，Ｎ＿２Ｏ量也增大。试验还发现，电晕放电对Ｎ＿２Ｏ无分解作用，空气中的氮气在电晕中不生成Ｎ２Ｏ，脱硫及喷氮脱硫不生成Ｎ２Ｏ，ＳＯ２和ＮＨ３对Ｎ＿２Ｏ的生成无影响。讨论了脉冲电晕放电脱硝中Ｎ２Ｏ生成的机理。     

用赤霉素作新还原剂还原砷钼杂多酸分光光度法测定钢铁中的微量砷

用赤霉素作新还原剂，对砷钼杂多酸的还原反应进行了系统研究．在０．６６ｍｏｌ／ＬＨ２ＳＯ４介质中，赤霉素能将砷钼杂多酸还原成十分稳定的砷钼杂多蓝，其最大吸收峰位于８３５ｎｍ处，表观摩尔吸光系数为２．６４×１０４Ｌ／ｍｏｌｃｍ．Ａｓ（Ⅴ）浓度在０～１．２ｍｇ／Ｌ范围内符合比耳定律．本法灵敏度高，选择性好，应用于钢铁中微量砷的测定，获得了满意的结果．     

石油焦燃烧过程中NO_x和SO_2析出规律的研究

在卧式加热炉和富氧条件下,对石油焦在燃烧过程中的ＮＯｘ 和ＳＯ２ 析出规律进行研究,发现石油焦的ＮＯｘ 和ＳＯ２ 析出受多种因素的影响：温度增加,ＮＯｘ 的析出量增加;颗粒粒径增加,ＮＯｘ 和ＳＯ２ 的析出量减少;石灰石微量增加,ＮＯｘ 的浓度降低,石灰石过量增加,ＮＯｘ 的浓度反而升高,石灰石的增加使ＳＯ２ 降低;ＮＯｘ 的析出并不与Ｎ 的质量分数成正比,ＳＯ２ 的析出与Ｓ的质量分数成正比．结合这些实验现象,从机理上对它们进行解析．     

用赤霉素作新还原剂还原砷钼杂多酸分光光度法测定钢铁…

用赤霉素作新还原剂，对砷钼杂多酸的还原反应进行了系统研究。在０．６６ｍｏｌ／Ｌ Ｈ２ＳＯ４介质中，赤霉素能将砷钼杂多酸还原成十分稳定的砷钼杂多蓝，其最大吸收峰位于８３５ｎｍ处，表观摩尔吸光系数为２．６４×１０＾４Ｌ／ｍｏｌ·ｃｍ．Ａｓ（Ⅴ）浓度在０－１．２ｍｇ／Ｌ范围内符合比耳定律。本法灵敏度高，选择性好，应用于钢铁中微量砷的测定，获得了满意的结果。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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